KR102768465B1 - Apparatus and method for controlling wireless power transfer - Google Patents

Abstract

A wireless power transmission control method performed by an electric vehicle device (EV device) that receives power from a power supply device is disclosed. The wireless power transmission control method according to one embodiment of the present invention may include: a step of checking service details regarding a pairing method between the power supply device and the EV device and selecting a service; a step of performing precision positioning with the power supply device according to a precision positioning and pairing method associated with the selected service; a step of performing LF (Low Frequency) pairing according to the selected service; a step of performing an initial alignment check using pre-charging power transmission; and a step of performing LPE (Low Power Excitation) pairing according to the selected service and a result of performing the initial alignment check.

Description

{APPARATUS AND METHOD FOR CONTROLLING WIRELESS POWER TRANSFER}

The present invention relates to a wireless power transmission control method and device, and more specifically, to a wireless power transmission control method performed by an electric vehicle device, a wireless power transmission control device using the method, and a power supply device.

Electric vehicles (EVs) currently under development use batteries to drive the motor, and have the advantages of producing less air pollutants such as exhaust gases and noise, being less prone to breakdowns, having a longer lifespan, and being easier to drive than conventional gasoline engine vehicles.

Electric vehicles are classified into hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), and electric vehicles (EVs) based on their powertrains. HEVs have engines as their main power source and motors as their auxiliary power source. PHEVs have motors as their main power source and engines that are used when the battery is discharged. EVs have motors, but no engines.

The electric vehicle charging system can be basically defined as a system that charges the battery mounted on the electric vehicle using the power of the commercial power grid or the power of the energy storage device. This electric vehicle charging system can take various forms depending on the type of electric vehicle. For example, the electric vehicle charging system can include a conductive charging system using a cable or a non-contact wireless power transmission system.

Electric vehicle charging control is performed through a communication protocol between the electric vehicle and the charging station. Therefore, all control of the electric vehicle charging session must be performed at the charging station or the electric vehicle. At this time, the user needs to check the charging status of the electric vehicle or control the charging progress.

The purpose of the present invention to solve the above problems is to provide a method for controlling wireless power transmission performed by an electric vehicle device (EV device).

Another object of the present invention to solve the above problems is to provide a power transmission control device for an electric vehicle device (EV device) using the wireless power transmission control method.

Another object of the present invention to solve the above problems is to provide a wireless power transmission method performed by a power supply device that supplies power to an electric vehicle device (EV Device).

According to one embodiment of the present invention for achieving the above object, a method for controlling wireless power transmission performed by an electric vehicle device (EV device) that receives power from a power supply device may include: a step of checking service details regarding a precise positioning and pairing method between the power supply device and the EV device and selecting a service; a step of performing precise positioning with the power supply device according to the precise positioning and pairing method associated with the selected service; a step of performing LF (Low Frequency) pairing according to the selected service; a step of performing an initial alignment check using pre-charging power transmission; and a step of performing LPE (Low Power Excitation) pairing according to the selected service and a result of performing the initial alignment check.

The step of performing an initial alignment check using the above pre-charge power transfer may include a step of determining whether to renegotiate Wireless Power Transfer (WPT) precision positioning based on the pre-charge power received from the power supply device.

The step of determining whether to renegotiate WPT precision positioning based on the above pre-charge power may include the step of determining whether a minimum power transfer efficiency of the pre-charge power is equal to or greater than a reference value; the step of determining that misalignment has occurred if the minimum power transfer efficiency is less than the reference value; and the step of determining whether to perform WPT precision positioning renegotiation based on the occurrence of misalignment.

Meanwhile, the service discovery response message provided by the power supply device to confirm the service details may include a parameter indicating whether service renegotiation is possible.

Here, the service renegotiation can be triggered by a charging loop message by the power supply device or a PowerDeliveryReq message by the electric vehicle device during charging.

The above service renegotiation may also be triggered when the power supply device and the EV device wake up from a charging pause period.

The above pairing method may include one or more of LF (Low Frequency) pairing and LPE (Low Power Excitation) pairing.

The above wireless power transmission control method can re-perform the steps of checking the service details and selecting the service, performing the precision positioning, and performing the LF pairing according to the decision to perform the WPT precision positioning renegotiation.

After the step of performing the above LF precision positioning and pairing, the step of performing authentication between the electric vehicle device and the power supply device may be further included.

The step of performing LPE (Low Power Excitation) pairing according to the above-mentioned selected service and the result of the initial alignment check may be performed when the minimum power transfer efficiency is equal to or higher than a reference value.

According to one embodiment of the present invention for achieving the above-described other purpose, a power transmission control device of an electric vehicle device (EV device) may include an EV power circuit that receives power provided by a power supply device; a processor; and a memory that stores at least one command executed through the processor.

The at least one command may include: a command to check service details regarding the electric vehicle device and the precise positioning and pairing method for wireless power transmission and to select a service; a command to perform precise positioning according to the precise positioning and pairing method associated with the selected service; a command to perform LF (Low Frequency) pairing according to the selected service; a command to perform an initial alignment check using pre-charging power transmission; and a command to perform LPE (Low Power Excitation) pairing according to the selected service and a result of performing the initial alignment check.

A power transmission control device of an electric vehicle device (EV device) may further include an EV communication controller (EVCC) that communicates with the power supply device using wireless communication; and an EV device P2PS (Point to Point Signal) controller that forms a P2PS connection with the power supply device using an LF (Low Frequency) signal.

The above EV Power Circuit can receive an LPE (Low Power Excitation) signal transmitted by the power supply device.

The command to perform an initial alignment check using the above pre-charge power transfer may include a command to determine whether to renegotiate Wireless Power Transfer (WPT) precision positioning based on the pre-charge power received from the power supply device.

A command for determining whether to renegotiate WPT precision positioning based on the above pre-charge power may include a command for determining whether a minimum power transfer efficiency of the above pre-charge power is equal to or greater than a reference value; a command for determining that misalignment has occurred if the minimum power transfer efficiency is less than the reference value; and a command for determining whether to perform WPT precision positioning renegotiation based on the occurrence of misalignment.

Meanwhile, the service discovery response message provided by the power supply device to confirm the service details may include a parameter indicating whether service renegotiation is possible.

Here, the service renegotiation can be triggered by a charging loop message by the power supply device or a PowerDeliveryReq message by the electric vehicle device during charging.

The above service renegotiation may also be triggered when the power supply device and the EV device wake up from a charging pause period.

Additionally, the processor may re-execute a command to check the service details and select a service, a command to perform the precision positioning, and a command to perform the LF pairing, based on the decision to perform the WPT precision positioning renegotiation.

A command to perform LPE (Low Power Excitation) pairing according to the above-mentioned selected service and the result of the above-mentioned initial alignment check may be performed when the minimum power transfer efficiency is equal to or higher than a reference value.

According to another embodiment of the present invention for achieving the above another object, a wireless power transmission method performed by a power supply device supplying power to an electric vehicle device (EV Device) may include: a step of checking a service status for a precise positioning and pairing method according to a service detail confirmation request from the EV Device and sending a reply to the EV Device; a step of performing precise positioning with the EV Device according to a precise positioning and pairing method associated with a service selected by the EV Device; a step of performing LF (Low Frequency) pairing according to the selected service; a step of transmitting pre-charging power to the EV Device to be used for an initial alignment check; and a step of performing LPE (Low Power Excitation) pairing according to a result of performing the selected service and the initial alignment check; and a step of transmitting power to the EV Device.

At this time, whether to renegotiate WPT (Wireless Power Transfer) precision positioning can be determined by the electric vehicle device based on the pre-charge power.

The above wireless power transmission method can re-perform the steps of checking the service details and selecting the service, performing the precision positioning, and performing the LF pairing according to the decision to perform the WPT precision positioning renegotiation.

The above pairing method may include one or more of LF (Low Frequency) pairing and LPE (Low Power Excitation) pairing.

The step of performing LPE (Low Power Excitation) pairing according to the above-mentioned selected service and the result of the initial alignment check may be performed when the minimum power transfer efficiency is equal to or higher than a reference value.

Meanwhile, the service discovery response message provided by the power supply device to confirm the service details may include a parameter indicating whether service renegotiation is possible.

Here, the service renegotiation can be triggered by a charging loop message by the power supply device or a PowerDeliveryReq message by the electric vehicle device during charging.

The above service renegotiation may also be triggered when the power supply device and the EV device wake up from a charging pause period.

According to the present invention, wireless power transfer can be provided with better transmission efficiency by performing WPT (Wireless Power Transfer) precision positioning renegotiation and service renegotiation based on the transmission efficiency of pre-charge power.

FIG. 1 is a conceptual diagram for explaining the concept of wireless power transmission for an electric vehicle to which one embodiment of the present invention is applied.
FIG. 2 is a block diagram illustrating components associated with wireless power transmission according to one embodiment of the present invention.
FIG. 3 is a schematic flowchart of wireless power transfer (WPT) according to one embodiment of the present invention.
FIGS. 4A and 4B are flowcharts of a service detail confirmation process in wireless power transmission according to one embodiment of the present invention.
FIGS. 5A and 5B are flowcharts of a service selection process in wireless power transmission according to one embodiment of the present invention.
FIGS. 6A and 6B are flowcharts of a fine positioning setup process in wireless power transmission according to one embodiment of the present invention.
FIGS. 7A and 7B are flowcharts of a fine positioning process in wireless power transmission according to one embodiment of the present invention.
FIGS. 8A to 8D are flowcharts of an LF pairing process in wireless power transmission according to one embodiment of the present invention.
FIGS. 9A to 9C are flowcharts of an LF pairing hold process in wireless power transmission according to one embodiment of the present invention.
FIGS. 10A to 10B are flowcharts of an authentication process in wireless power transmission according to one embodiment of the present invention.
FIGS. 11a and 11b are flowcharts of an initial alignment check setup process according to one embodiment of the present invention.
Figures 12a to 12e are flowcharts of an initial alignment check process according to one embodiment of the present invention.
Figures 13a to 13d are flowcharts of an LPE pairing process according to one embodiment of the present invention.
FIGS. 14a to 14c are flowcharts of an LPE pairing stop process according to one embodiment of the present invention.
FIG. 15 is a flowchart related to service renegotiation in wireless power transfer (WPT) according to one embodiment of the present invention.
FIGS. 16a to 16b are flowcharts of a service detail confirmation process in wireless power transmission according to another embodiment of the present invention.
FIGS. 17A to 17D are flowcharts of service selection and precise positioning setup in wireless power transfer according to another embodiment of the present invention.
FIGS. 18a to 18d are flowcharts of a precision positioning process and a pairing process in wireless power transmission according to another embodiment of the present invention.
FIGS. 19A to 19E are flowcharts of LF pairing hold and initial alignment check setup in wireless power transfer according to another embodiment of the present invention.
FIGS. 20A to 20E are flowcharts of an initial alignment check LF pairing interruption process in wireless power transmission according to another embodiment of the present invention.
Figure 21 is a block diagram of a power transmission control device according to one embodiment of the present invention.
Figure 22 is a block diagram of a wireless power transmission device according to one embodiment of the present invention.

본 발명은 다양한 변경을 가할 수 있고 여러 가지 실시예를 가질 수 있는 바, 특정 실시예들을 도면에 예시하고 상세한 설명에 상세하게 설명하고자 한다. 그러나, 이는 본 발명을 특정한 실시 형태에 대해 한정하려는 것이 아니며, 본 발명의 사상 및 기술 범위에 포함되는 모든 변경, 균등물 내지 대체물을 포함하는 것으로 이해되어야 한다. 각 도면을 설명하면서 유사한 참조부호를 유사한 구성요소에 대해 사용하였다.

The present invention can have various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, but should be understood to include all modifications, equivalents, or substitutes included in the spirit and technical scope of the present invention. In describing each drawing, similar reference numerals are used for similar components.

Although the terms first, second, A, B, etc. may be used to describe various components, the components should not be limited by the terms. The terms are only used to distinguish one component from another. For example, without departing from the scope of the present invention, the first component could be referred to as the second component, and similarly, the second component could also be referred to as the first component. The term "and/or" includes any combination of a plurality of related listed items or any item among a plurality of related listed items.

When it is said that a component is "connected" or "connected" to another component, it should be understood that it may be directly connected or connected to that other component, but that there may be other components in between. On the other hand, when it is said that a component is "directly connected" or "directly connected" to another component, it should be understood that there are no other components in between.

The terminology used in this application is only used to describe specific embodiments and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this application, it should be understood that the terms "comprises" or "has" and the like are intended to specify the presence of a feature, number, step, operation, component, part or combination thereof described in the specification, but do not exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms defined in commonly used dictionaries, such as those defined in common dictionaries, should be interpreted as having a meaning consistent with the meaning they have in the context of the relevant art, and will not be interpreted in an idealized or overly formal sense unless expressly defined in this application.

Some terms used in this specification are defined as follows.

Electric Vehicle (EV) may refer to an automobile as defined in 49 CFR (code of federal regulations) 523.3, etc. An EV may be powered by electricity supplied by an onboard energy storage device, such as a battery, that is highway-capable and rechargeable from an external power source. Power sources may include residential or public electric service, or a generator that uses fuel onboard the vehicle.

An electric vehicle (EV) can be referred to as an electric car, electric automobile, ERV (electric road vehicle), PV (plug-in vehicle), or xEV (plug-in vehicle), and an xEV can be referred to as or distinguished from a BEV (plug-in all-electric vehicle or battery electric vehicle), PEV (plug-in electric vehicle), HEV (hybrid electric vehicle), HPEV (hybrid plug-in electric vehicle), or PHEV (plug-in hybrid electric vehicle).

A plug-in electric vehicle (PEV) can be referred to as an electric vehicle that can be connected to the power grid to recharge the vehicle's onboard primary battery.

A plug-in vehicle (PV) may be referred to herein as a vehicle that can be recharged wirelessly from an Electric Vehicle Supply Equipment (EVSE) without using a physical plug and socket.

Heavy duty vehicles (H.D. vehicles) may refer to any vehicle with four or more wheels as defined in 49 CFR 523.6 or CFR 37.3 (bus).

Light duty plug-in electric vehicle (LTE) may refer to a vehicle with three or four wheels that is propelled by an electric motor supplied by a rechargeable battery or other energy source, primarily for use on public streets, roads and highways. A LTE may be defined as having a gross weight of less than 4.545 kg.

A wireless power charging system (WCS) may refer to a system for wireless power transfer and control between GA and VA, including alignment and communication.

Wireless power transfer (WPT) can refer to the transfer of electrical power from an alternating current (AC) power supply network, such as a utility or grid, to an electric vehicle through contactless means.

A utility provides electrical energy and can be referred to as a set of systems, typically including a Customer Information System (CIS), Advanced Metering Infrastructure (AMI), and Rates and Revenue systems. The utility can make energy available to plug-in electric vehicles through price lists or discrete events. The utility can also provide information on tariffs, intervals for metered electricity consumption, and qualification of electric vehicle programs for plug-in electric vehicles.

Smart charging can be described as a system where EVSE and/or plug-in electric vehicles communicate with the power grid to optimize the vehicle charge or discharge rate to grid capacity or time of day for cost-to-use ratios.

Automatic charging can be defined as the act of positioning a vehicle in an appropriate location relative to a primary charger assembly capable of transferring power and inductively charging it. Automatic charging can be performed after obtaining the necessary authentication and authorization.

Interoperability can refer to the state in which the components of a system relative to each other can work together to perform the intended operation of the entire system. Information interoperability can refer to the ability of two or more networks, systems, devices, applications, or components to share information safely and effectively and easily with little or no inconvenience to users.

An inductive charging system may refer to a system that electromagnetically transfers energy in the forward direction from a power supply network to an electric vehicle through a transformer in which two parts are loosely coupled. In this embodiment, the inductive charging system may correspond to an electric vehicle charging system.

An inductive coupler can refer to a transformer formed by a GA coil and a VA coil and transmitting power through electrical insulation.

Inductive coupling can refer to the magnetic coupling between two coils. The two coils can refer to the ground assembly coil and the vehicle assembly coil.

A ground assembly (GA) may refer to an assembly that is disposed on the ground or infrastructure side, including a GA coil and other suitable components. The other suitable components may include at least one component for controlling impedance and resonant frequency, a ferrite for reinforcing a magnetic path, and an electromagnetic shielding material. For example, the GA may include a power/frequency conversion device necessary to function as a power source of a wireless charging system, a GA controller, and wiring from a grid, and wiring between each unit and filtering circuits, a housing, etc.

A vehicle assembly (VA) may refer to an assembly disposed in a vehicle, including a VA coil and other suitable components. The other suitable components may include at least one component for controlling impedance and resonant frequency, a ferrite for reinforcing a magnetic path, and an electromagnetic shielding material. For example, the VA may include a rectifier/power converter necessary to function as a vehicle component of a wireless charging system, a VA controller, and wiring for a vehicle battery, as well as wiring between each unit and filtering circuits, a housing, etc.

The aforementioned GA may be referred to as a supply device, a power supply-side device, etc., and similarly, the VA may be referred to as an electric vehicle device (EV device), an electric vehicle-side device, etc.

The supply device may be a device external to the electric vehicle that provides a contactless connection to the electric vehicle-side device. The supply device may be referred to as a primary-side device. When the electric vehicle receives power, the supply device may act as a power source that transmits power. The supply device may include a housing and all covers.

The EV device may be a device mounted on an electric vehicle that provides a contactless connection to a power supply device. The EV device may be referred to as a secondary device. When the electric vehicle receives power, the EV device may transfer power from the power supply device to the electric vehicle. The EV device may include a housing and all covers.

A Ground Assembly controller may be a part of the GA that regulates the output power level to the GA coil based on information from the vehicle.

A Vehicle Assembly Controller may be a part of the VA that monitors certain vehicle parameters during charging and initiates communication with the GA to control the output power level.

The aforementioned GA controller may be referred to as a supply power circuit (SPC) of a power supply-side device, and the VA controller may be referred to as an electric vehicle power circuit (EV power circuit, EVPC).

The magnetic gap may refer to the vertical distance between the highest plane of the upper part of the Litz wire or the upper part of the magnetic material of the GA coil and the lowest plane of the lower part of the Litz wire or the magnetic material of the VA coil when they are aligned with each other.

Ambient temperature may refer to the ground level temperature measured in the atmosphere of a target subsystem that is not directly exposed to sunlight.

Vehicle ground clearance can refer to the vertical distance between the road or pavement and the lowest part of the vehicle's floor pan.

Vehicle magnetic ground clearance can refer to the vertical distance between the lowest plane of the floor of the Litz line or the insulating material of the VA coil mounted on the vehicle and the road pavement.

Vehicle assembly (VA) coil surface distance can refer to the vertical distance between the bottommost plane of the Litz wire or the magnetic material of the VA coil and the bottommost outer surface of the VA coil. This distance can include additional items packaged with protective covering material and coil packaging material.

The above-mentioned VA coil may be referred to as a secondary coil, a vehicle coil, a receiver coil, etc., and similarly, the ground assembly coil (GA coil) may be referred to as a primary coil, a transmit coil, etc.

An exposed conductive component may refer to a conductive component of an electrical device (e.g., an electric vehicle) that can be touched by a person and is not normally conductive but may become conductive in the event of a fault.

Hazardous live component may refer to a live component that may, under certain conditions, provide a hazardous electric shock.

Live component may refer to any conductor or conductive part that is electrically active in its basic application.

Direct contact can refer to contact between living beings, such as humans.

Indirect contact may refer to contact with exposed, conductive, live components due to an insulation failure (see IEC 61140).

Alignment may refer to a process of finding a relative position of an electric vehicle-side device to a power supply-side device for a prescribed efficient power transfer and/or a process of finding a relative position of a power supply-side device to an electric vehicle-side device. In this specification, alignment may refer to, but is not limited to, positional alignment of a wireless power transfer system.

Pairing may refer to a procedure in which a single dedicated ground assembly (power supply side device) arranged to transfer power is associated with a vehicle (electric vehicle). In this specification, pairing may include a procedure for associating a charging spot or a specific ground assembly with a vehicle assembly controller. Association may include a procedure for establishing a relationship between two peer communication entities.

High-level communication can handle all information beyond that handled by command and control communication. The data link of high-level communication can use PLC (Power line communication), but is not limited to this.

Low power excitation may refer to, but is not limited to, activating the electric vehicle to detect the power supply side device for precision positioning and pairing, and vice versa.

SSID(Service set identifier) is a unique identifier consisting of 32 characters attached to the header of packets transmitted on a wireless LAN. SSID distinguishes the BSS(basic service set) that a wireless device is trying to connect to. SSID basically distinguishes multiple wireless LANs from each other. Therefore, all AP(access point) and all terminal/station devices that want to use a specific wireless LAN can use the same SSID. Devices that do not use a unique SSID cannot join the BSS. Since SSID is displayed as plain text, it may not provide any security features to the network.

ESSID (Extended service set identifier) is the name of the network you want to connect to. It is similar to SSID, but can be a more extended concept.

BSSID(Basic service set identifier) is usually 48 bits and is used to distinguish a specific BSS(basic service set). For infrastructure BSS networks, BSSID can be the MAC(medium access control) of the AP equipment. For independent BSS or ad hoc networks, BSSID can be generated as a random value.

A charging station may include at least one ground assembly and at least one ground assembly controller that manages at least one ground assembly. The ground assembly may include at least one wireless communication device. The charging station may refer to a location having at least one ground assembly, such as a home, an office, a public place, a road, a parking lot, etc.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the attached drawings.

FIG. 1 is a conceptual diagram for explaining the concept of wireless power transmission for an electric vehicle to which one embodiment of the present invention is applied.

Referring to FIG. 1, wireless power transfer can be performed by at least one component of an electric vehicle (10) and a charging station (20), and can be used to wirelessly transfer power to the electric vehicle (10).

Here, an electric vehicle (10) can be generally defined as a vehicle (automobile) that supplies current induced from a rechargeable energy storage device, such as a battery (12), as an energy source for an electric motor, which is a power unit.

However, the electric vehicle (10) according to the present invention may include a hybrid vehicle having both an electric motor and a general internal combustion engine, and may include not only an automobile but also a motorcycle, a cart, a scooter, and an electric bicycle.

In addition, the electric vehicle (10) may include a receiving pad (11) including a receiving coil so as to wirelessly charge the battery (12), and may also include a plug connection port so as to wire-charge the battery (12). In this case, an electric vehicle (10) capable of wire-charging the battery (12) may be referred to as a plug-in electric vehicle (PEV).

Here, the charging station (20) can be connected to a power grid (30) or a power backbone and can provide alternating current (AC) or direct current (DC) power to a transmitting pad (21) including a transmitting coil via a power link.

In addition, the charging station (20) can communicate with a power grid (30) or an infrastructure management system or infrastructure server that manages the power grid through wired or wireless communication, and can perform wireless communication with an electric vehicle (10).

Here, wireless communications can include Bluetooth, zigbee, cellular, and wireless local area networks.

Additionally, for example, the charging station (20) may be located in various locations, such as a parking lot attached to the home of an electric vehicle owner (10), a parking area for charging electric vehicles at a gas station, a parking area at a shopping center or workplace, etc.

Here, the process of wirelessly charging the battery (12) of the electric vehicle (10) can be performed by first positioning the receiving pad (11) of the electric vehicle (10) in an energy field by the transmitting pad (21), and then allowing the transmitting coil of the transmitting pad (21) and the receiving coil of the receiving pad (11) to interact or couple with each other. As a result of the interaction or coupling, an electromotive force is induced in the receiving pad (11), and the battery (12) can be charged by the induced electromotive force.

Additionally, the charging station (20) and the transmitting pad (21) may be referred to as a ground assembly (GA), in whole or in part, and the ground assembly may refer to the meaning defined above.

Additionally, the receiving pad (11) of the electric vehicle (10) and all or part of other internal components of the electric vehicle may be referred to as a vehicle assembly (VA), where the vehicle assembly may refer to the meaning defined above.

Here, the transmitting pad or receiving pad may be configured as non-polarized or polarized.

At this time, if the pad is nonpolar, it can have one pole in the center of the pad and an opposite pole around the outer periphery. Here, the flux can be formed to exit at the center of the pad and return at all outer boundaries of the pad.

Additionally, if the pads are polar, they can have each pole at either end of the pad. Here, the magnetic flux can be formed based on the orientation of the pad.

FIG. 2 is a block diagram illustrating components associated with wireless power transmission according to one embodiment of the present invention.

Magnetic field wireless power transfer (MF-WPT) for electric vehicles can be defined as the transfer of electrical energy from a supply network via electrical or magnetic fields or radio waves between a primary device and a secondary device without current flow through a galvanic connection.

Referring to FIG. 2, MF-WPT can be performed between a power supply device (100) and an EV device (EV device; 200). Here, the power supply device (100) can be connected to a supply network, and the EV device (200) can be associated with a RESS (Rechargeable Energy Storage System).

More specifically, the power supply device (100) may include a supply power circuit (SPC) (130), a supply equipment communication controller (SECC) (140), and a supply device P2PS (Point to Point Signal) controller (150). The supply power circuit (130) may include a primary device (131) and supply power electronics (132).

An EV device (200) may include an EV power circuit (EVPC) (230), an EV communication controller (EVCC) (240), and an EV device P2PS controller (250). Here, the EV power circuit (230) may include a secondary device (231) and EV power electronics (232).

A wireless power flow (a) exists between the primary device (131) and the secondary device (231). That is, wireless power transfer occurs from the primary device (131) to the secondary device (231). In addition, a wireless P2PS interface (b) may be formed between the supply device P2PS controller (150) and the EV device P2PS controller (250), and a wireless communication interface (c) may be formed between the supply device communication controller (140) and the EV communication controller (240).

At this time, the wireless communication standard between the supply device communication controller and the EV communication controller may follow IEEE Std 802.11. In addition, the wireless P2PS interface formed between the supply device P2PS controller (150) and the EV device P2PS controller (250) may be implemented via an LF signal.

FIG. 3 is a schematic flowchart of wireless power transfer (WPT) according to one embodiment of the present invention.

Referring to FIG. 3, the wireless power transmission method according to the present invention may include steps of Service Detail/Service Selection (S310), Fine Positioning Setup/Fine Positioning (S320), LF Pairing/LF Pairing Hold (S330), Authorization (S340), Initial Alignment Check Setup/Initial Alignment Check (S350), and LPE Pairing/LPE Pairing Stop (S360).

Here, the operating subjects of the wireless power transfer according to the present invention may be the power supply device and the EV device. More specifically, the supply device communication controller (SECC) (140), the supply power circuit (SPC) (130), and the supply device P2PS controller (150) within the power supply device, and the EV communication controller (EVCC) (240), the EV power circuit (230), the EV device P2PS controller (250) within the EV device (200), etc. may be the operating subjects of the wireless power transfer according to the present invention.

Here, the supply power circuit (130) may include an SD WPT controller and an SD LPE (Low Power Excitation) controller, and the supply device P2PS controller (150) may include an SD LF (Low Frequency) controller and an SD LF antenna.

Additionally, the EV power circuit (230) may include an EV WPT controller and an EV LPE controller, and the EV device P2PS controller (250) may include an EV LF controller and an EV LF antenna.

Details for each step are explained in Figures 4 to 14 below.

In FIGS. 4 to 14, for convenience of illustration, the power supply device (100) is represented as a separate block from the supply device communication controller (SECC) (140), the supply power circuit (SPC) (130), and the supply device P2PS controller (150). However, the power supply device may include the supply device communication controller (SECC) (140), the supply power circuit (SPC) (130), and the supply device P2PS controller (150). Therefore, the power supply device (100) illustrated in FIGS. 4 to 14 may be understood as a main processor of the power supply device that performs wireless power transmission according to the present invention.

The EV device (200) may also include an EV communication controller (EVCC) (240), an EV power circuit (230), and an EV device P2PS controller (250). Accordingly, the EV device (200) illustrated in FIGS. 4 to 14 may be understood as a main processor of an EV device that performs wireless power transfer according to the present invention.

FIGS. 4A and 4B are flowcharts of a service detail confirmation process in wireless power transmission according to one embodiment of the present invention.

Referring to FIGS. 4A and 4B, the service detail confirmation process may include a step in which, in response to a service detail confirmation request from an EV device, an EV power circuit (230), an EV device P2PS controller (250), a supply power circuit (130), and a supply device P2PS controller (150) confirm the status of an EV LPE, the status of an EV LF, the status of a supply device (SD) LPE, and the status of an SD LF, and return each status information to the EV device.

FIGS. 5A and 5B are flowcharts of a service selection process in wireless power transmission according to one embodiment of the present invention.

Referring to FIGS. 5a to 5b, the EV device (200) that has confirmed the status of the EV LPE, the status of the EV LF, the status of the SD LPE, and the status of the SD LF through the service detail confirmation process compares the services that the EV device and the power supply device can provide (S510).

That is, it is checked and compared whether the service that the EV device (EVD) can provide is LPE, LF, or both LPE and LF, and whether the service that the power supply device (SD) can provide is LPE, LF, or both LPE and LF. As a result of the comparison, if the types of services that the EV device can provide and the types of services that the power supply device (SD) can provide are different, the service session is terminated or a re-association procedure is performed (S520).

If there is one or more services of the same type that can be provided by the EV device and the power supply device (SD), the EV device selects the service (S530) and transmits the service selection result to the power supply device (100) through the EVCC (240).

FIGS. 6A and 6B are flowcharts of a fine positioning setup process in wireless power transmission according to one embodiment of the present invention.

In the precision positioning setup process (S610), the EV device first confirms the selected precision positioning method through the service detail confirmation and service selection processes. Depending on whether the EV device uses LF, LPE, or both methods for precision positioning, it transmits a precision positioning initialization request (FinePositioningInitializationReq.) to the EV LPE controller or the EV device P2PS controller and receives a response (FinePositioningInitializationRes) to the precision positioning initialization request from them.

The EV device transmits a fine positioning setup request (FinePositioningSetupReq.) to the power supply device when confirmation of LPE and/or LF for fine positioning is completed. The power supply device (100) transmits a fine positioning initialization request (FinePositioningInitializationReq.) to the SD LPE controller or the SD P2PS controller depending on whether the power supply device uses LF, LPE, or both methods for fine positioning, and receives a response (FinePositioningInitializationRes.) to the fine positioning initialization request from them, thereby performing a fine positioning setup procedure in the power supply device (S620).

FIGS. 7A and 7B are flowcharts of a fine positioning process in wireless power transmission according to one embodiment of the present invention.

When the fine positioning setup procedure is completed, the EV device transmits a fine positioning wait request (FinePositioningAwaitReq.) signal to the EV power circuit (230) and the EV device P2PS controller (250) and receives a response signal from them (S710). The power supply device also transmits a fine positioning wait request (FinePositioningAwaitReq.) signal to the SD power circuit (130) and the supply device P2PS controller (150) and receives a response signal from them (S720).

In the subsequent pairing procedure, either LF pairing or LPE pairing may be performed depending on the precise positioning method serviced by the EV device and the power supply device, and if both precise positioning methods are used, both LF pairing and LPE pairing may be performed.

FIGS. 8A to 8D are flowcharts of an LF pairing process in wireless power transmission according to one embodiment of the present invention.

Referring to FIGS. 8a to 8d, during the LF pairing process, the EV device P2PS controller (250) transmits a magnetic field using the EV LF antenna according to the LF pairing initiation request (LFPairingStartReq.) of the EV device (S810).

The power supply device (100) detects a magnetic field transmitted by the EV LF antenna, i.e., an LF signal, from the SD LF antenna and responds to the EV device that LF pairing data has been received (S820).

FIGS. 9A to 9C are flowcharts of an LF pairing hold process in wireless power transmission according to one embodiment of the present invention.

LF pairing can be held by a pairing hold request when necessary, as illustrated in FIGS. 9a to 9c.

FIGS. 10A to 10B are flowcharts of an authentication process in wireless power transmission according to one embodiment of the present invention.

After LF pairing, an authentication process is performed as illustrated in FIGS. 10a and 10b. If the procedure is a WPT precision positioning renegotiation procedure (Yes in S1010), the authentication process may be omitted.

Authentication is performed between the EV device (200) and the power supply device (100) according to the EV device authentication request (EVDAuthorizationReq.).

Additionally, the authentication process of FIG. 10 may include an identity detail verification procedure. The identity detail verification procedure may be performed in the form of the EV device sending an identity detail verification request (EVDIdentificationDetailReq; IdentificationDetailReq) to the power supply device and receiving a response (SDIdentificationDetailRes; IdentificatioDetailRes).

FIGS. 11a and 11b are flowcharts of an initial alignment check setup process according to one embodiment of the present invention.

In the initial alignment check setup process, the EV device first transmits an initial alignment check setup request to the power supply device (100) and requests the EV power circuit (230) to perform pre-charging initialization and pre-charging await (S1110).

The power supply device (100) causes the SD WPT controller of the supply power circuit (130) to perform pre-charging initialization and pre-charging await according to a request of the EV device (S1120).

Figures 12a to 12e are flowcharts of an initial alignment check process according to one embodiment of the present invention.

After the initial alignment check setup procedure, the EV device (200) transmits an initial alignment check start request (InitialAlignmentCheckStartReq.) to the power supply device (100). Upon receiving this, the power supply device causes the SD WPT controller to perform transmission of pre-charging power.

The EV power circuit (230) of the EV device receives pre-charge power transmitted by the power supply device and determines whether to renegotiate WPT precision positioning based on the received pre-charge power (S1200).

More specifically, in the step (S1200) of determining whether to renegotiate WPT precision positioning, the EV device determines whether the minimum power transfer efficiency of the pre-charging power received from the power supply device is equal to or higher than a reference value, and if the minimum power transfer efficiency is equal to or higher than the reference value, the EV device does not perform WPT precision positioning renegotiation and instead performs the LF pairing stop procedure and the LPE pairing procedure. Here, the reference value related to the power transfer efficiency may be 85%.

On the other hand, if the minimum power transfer efficiency is below the standard, it is determined that misalignment has occurred and whether to re-perform WPT pairing.

If WPT pairing is not re-performed, alignment is stopped, safety monitoring and diagnostic checks are performed, and the V2G communication session is terminated or re-association is performed.

On the other hand, when re-performing WPT pairing, it is determined whether the number of times WPT pairing is re-performed is greater than or equal to a threshold value related to the number of repeated WPT pairings. If the number of times WPT pairing is re-performed is less than the threshold value, the WPT pairing procedure is continued.

If the number of times WPT pairing is re-performed is greater than or equal to a threshold related to repeated WPT pairing, the availability of LF service and/or LPE service of the EV device and the power supply device is checked, and then WPT fine positioning renegotiation is performed. Performing WPT fine positioning renegotiation means proceeding to the service selection step as seen in the embodiments of FIGS. 5a and 5b, and thereafter performing the fine positioning setup and fine positioning, LF pairing, and LF pairing hold procedures again. At this time, as seen in FIGS. 10a and 10b, the authorization step may be omitted in the WPT fine positioning renegotiation procedure.

Figures 13a to 13d are flowcharts of an LPE pairing process according to one embodiment of the present invention.

Once the initial alignment check is completed, the power supply device receives an LPE pairing request from the EV device and causes the primary device to transmit a magnetic field, i.e., an LPE signal, through the SD WPT controller. LPE pairing is performed when the secondary device of the EV device receives the LPE signal transmitted by the primary device through the SD WPT controller.

FIGS. 14a to 14c are flowcharts of an LPE pairing stop process according to one embodiment of the present invention.

The EV device compares the tolerance area of the power supply device with the position value of the EV device during LPE pairing and compares the center alignment point of the power supply device with the position value of the EV device to determine whether to continue or abort the WPT pairing.

When it is decided to stop pairing using LPE, the SD WPT controller of the power supply device instructs the primary device to stop transmitting the magnetic field, i.e. the LPE signal.

After the LPE pairing is interrupted, the actual power transfer between the primary device and the secondary device can be performed. If the charging procedure is interrupted after the actual power transfer procedure is initiated, i.e., the charging session is interrupted, it may occur. According to embodiments of the present invention, the charging session may be interrupted if a service renegotiation for WPT precise positioning and pairing is required, as described below.

FIG. 15 is a flowchart related to service renegotiation in wireless power transfer (WPT) according to one embodiment of the present invention.

According to one embodiment of the present invention, the process considered in service renegotiation during wireless power transfer may include a session setup step (S1510), a service discovery step (S1520), a service selection step (S1530), a charging loop step (S1540), a power transfer step (S1550), and a session interruption step (S1560).

As discussed above, a service renegotiation procedure may be required, whereby the EVCC or SECC reconsider the current service selection so that the EV can select a different set of services or different parameter values for the same service.

Examples of service changes include changing from scheduled control to dynamic control or vice versa, changing between AC charging and DC charging, and adding or removing value-added services (VAS).

In a charging session, the SECC can indicate via the first ServiceDiscoveryRes message whether service renegotiation is possible during that session. For this purpose, the ServiceDiscoveyRes message can contain parameters with the following characteristics:

- Parameter name: ServiceRenegotiationAllowed

- Type: Boolean

- Inclusion: Mandatory

The "ServiceRenegotiationAllowed" parameter is included in the first ServiceDiscoveryRes message and does not change during the session. If the EVCC or SECC violates the decision based on that parameter, the session is terminated.

In the embodiment of Fig. 15, two cases in which service renegotiation occurs are shown.

The first case is when service renegotiation is triggered during charging. For example, service renegotiation may be triggered during charging loop message exchange (S1540), such as AC_EnergyTransferLoop, DC_EnergyTransferLoop, and WPT_EnergyTransferLoop.

When the SECC triggers a service renegotiation, the SECC indicates its intention to renegotiate the service by setting "EVSENotification.EVSEStatus" to "ServiceRenegotiation" in the charging loop message it sends. However, even in this case, if the "ServiceRenegotiationAllowed" parameter is set to "False", the EV may ignore the contents of the EVSENotification.EVSEStatus parameter.

When EVCC triggers service renegotiation, it first sends a PowerDeliveryReq message with the ChargeProgress parameter set to "Stop" to SECC and continues the sequence until the session is stopped. It also sends a SessionStopReq with ChargingSession set to "ServiceRenegotiation". If the ResponseCode of the SessionStopRes. message is "OK", it sends a ServiceDiscoveryReq message to SECC and then selects another service.

If the ResponseCode of the SessionStopRes. message indicates that service renegotiation is not allowed (for example, "FAILED_NoServiceRenegotiationSupported"), the session is terminated. For example, if the ServiceRenegotiationAllowed parameter is "False", the SECC sends the SessionStopRes. message with the ResponseCode set to "FAILED_NoServiceRenegotiationSupported".

The second case related to service renegotiation is when service renegotiation is triggered upon waking up from a paused period. Here, the paused period is a session duration during which no energy is transferred and communication is not active between the EVCC and the SECC. Upon wakeup triggered by the EVCC or the SECC, the EVCC and the SECC perform the entire sequence from the SessionSetup step (S1510) to the charging loop (S1540).

When SECC triggers service renegotiation, SECC provides a different set of services and parameters in the ServiceDiscoveryRes message and ServiceDetailRes message.

Here, the ServiceDiscoveryRes message and the ServiceDetailRes message are messages in response to the SECC's request for confirmation of service details of the EV device, and can be understood as messages having the same or similar meaning or function.

When EVCC triggers service renegotiation, it may select different services and/or parameters than previously.

When service renegotiation is not allowed, the EVCC must abort the session if the SECC does not provide the same service/parameters. Additionally, if the EVCC selects a different service/parameters than the one previously selected, the SECC must send "FAILED_NoServiceRenegotiationSupported" as the response code.

Figures 16 to 20 illustrate the operational flow of a wireless power transmission method according to another embodiment of the present invention.

A wireless power transmission method according to another embodiment of the present invention may include a service detail check, service selection, precise positioning setup, precise positioning, LF pairing, LF pairing hold, initial alignment check setup, and LF pairing stop procedures.

FIGS. 16a to 16b are flowcharts of a service detail confirmation process in wireless power transmission according to another embodiment of the present invention.

The service detail confirmation process may include a step in which, in response to a service detail confirmation request from an EV device, an EV power circuit (230), an EV device P2PS controller (250), a supply power circuit (130), and a supply device P2PS controller (150) confirm the status of an EV LPE, the status of an EV LF, the status of an SD LPE, and the status of an SD LF, and return each status information to the EV device.

FIGS. 17A to 17D are flowcharts of service selection and precise positioning setup in wireless power transfer according to another embodiment of the present invention.

Referring to FIGS. 17a to 17d, the EV device (200) that has verified the status of the EV LPE, the status of the EV LF, the status of the SD LPE, and the status of the SD LF through the service detail verification process compares the services that the EV device and the power supply device can provide.

That is, it is checked and compared whether the service that the EV device (EVD) can provide is LPE, LF, or both LPE and LF, and whether the service that the power supply device (SD) can provide is LPE, LF, or both LPE and LF. If the comparison result shows that the types of services that the EV device can provide and the types of services that the power supply device (SD) can provide are different, the service session is terminated or a re-association procedure is performed.

If there is one or more services of the same type that can be provided by the EV device and the power supply device (SD), the EV device selects the service and transmits the service selection result to the power supply device (100) through the EVCC.

In the subsequent fine positioning setup process, the EV device first confirms the fine positioning method. Depending on whether the EV device uses LF, LPE, or both methods for fine positioning, it transmits a fine positioning initialization request to the EV LPE controller or the EV device P2PS controller and receives a response to the fine positioning initialization request from them. When confirmation of LPE and/or LF for fine positioning is completed, the EV device transmits a fine positioning setup request (FinePositioningSetupReq.) to the power supply device.

The power supply device (100) transmits a fine positioning initialization request (FinePositioningInitializationReq.) to the SD LPE controller or the SD P2PS controller depending on whether the power supply device uses LF, LPE, or both methods for fine positioning, and receives a response (FinePositioningInitializationRes.) to the fine positioning initialization request from them.

FIGS. 18a to 18d are flowcharts of a precision positioning process and a pairing process in wireless power transmission according to another embodiment of the present invention.

When the fine positioning setup procedure is completed, the EV device transmits a fine positioning wait request (FinePositioningAwaitReq.) signal to the EV power circuit (230) and the EV device P2PS controller (250) and receives a response signal from them. The power supply device also transmits a fine positioning wait request (FinePositioningAwaitReq.) signal to the SD power circuit (130) and the supply device P2PS controller (150) and receives a response signal from them.

In the subsequent pairing process, the EV device P2PS controller (250) can transmit a magnetic field using the EV LF antenna according to the LF pairing initiation request (LFPairingStartReq.) of the EV device.

The power supply device (100) detects a magnetic field transmitted by the EV LF antenna, i.e., an LF signal, from the SD LF antenna and responds to the EV device that LF pairing data has been received.

FIGS. 19A to 19E are flowcharts of LF pairing hold and initial alignment check setup in wireless power transfer according to another embodiment of the present invention.

The EV device can determine whether to continue or abort WPT pairing by comparing the tolerance area of the powered device with the position value of the EV device during pairing and comparing the center alignment point of the powered device with the position value of the EV device.

That is, LF pairing can be held by a pairing hold request for a required time as illustrated in Fig. 19.

Thereafter, in the initial alignment check setup process, the EV device first transmits an initial alignment check setup request to the power supply device (100) and requests the EV power circuit (230) to perform pre-charging initialization and pre-charging await.

The power supply device (100) also causes the SD WPT controller of the supply power circuit (130) to perform pre-charging initialization and pre-charging await at the request of the EV device.

FIGS. 20A to 20E are flowcharts of an initial alignment check and LF pairing interruption process in wireless power transmission according to another embodiment of the present invention.

After the initial alignment check setup procedure, the EV device (200) transmits an initial alignment check start request (InitialAlignmentCheckStartReq.) to the power supply device. Upon receiving this, the power supply device causes the SD WPT controller to perform pre-charging power transfer.

The EV power circuit (230) of the EV device receives the pre-charge power transmitted by the power supply device and determines whether to renegotiate WPT precision positioning based on the received pre-charge power.

In the step of determining whether to renegotiate WPT precise positioning, the EV device determines whether the minimum power transfer efficiency of the pre-charge power received from the power supply device is equal to or higher than a reference value, and if the minimum power transfer efficiency is equal to or higher than the reference value, the EV device does not perform WPT precise positioning renegotiation and instead performs the scheduled subsequent procedure, i.e., pairing interruption and power transfer procedure. Here, the reference value may be 85%.

On the other hand, if the minimum power transfer efficiency is below the standard, it is determined that misalignment has occurred and whether to re-perform WPT pairing.

If WPT pairing is not re-performed, the alignment is stopped. On the other hand, if WPT pairing is re-performed, it is determined whether the number of times WPT pairing is re-performed is greater than or equal to a threshold value related to the number of repeated WPT pairings. If the number of times WPT pairing is re-performed is less than the threshold value, the process returns to the WPT pairing procedure illustrated in Fig. 18 and continues with the subsequent procedure.

If the number of times WPT pairing is re-performed is greater than or equal to the threshold for repeated WPT pairing, the LF/LPE service availability of the EV device and the power supply device is checked, and then WPT fine positioning renegotiation is performed. Performing WPT fine positioning renegotiation means proceeding to the service selection step as examined through the embodiment of Fig. 17, and thereafter performing the fine positioning setup and fine positioning, pairing, and pairing hold procedures again.

Meanwhile, once the initial alignment check procedure is completed, LF pairing is stopped and actual power transfer, charge control and re-scheduling between the primary and secondary devices can be performed.

Figure 21 is a block diagram of a power transmission control device according to one embodiment of the present invention.

The power transmission control device (200) illustrated in Fig. 21 may be an EV device. That is, the configuration of the power transmission control device (200) in this specification is not limited to the name, and may be defined by function. In addition, one configuration may perform multiple functions, and one function may be performed by multiple configurations.

The power transmission control device (200) may include at least one processor (210) and a memory (220) storing at least one command for executing the above-described operation via the processor.

The processor can execute program commands stored in the memory, and may mean a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor on which the methods according to the present invention are performed. The memory may be composed of a volatile storage medium and/or a nonvolatile storage medium, and may be composed of a read only memory (ROM) and/or a random access memory (RAM).

The at least one command may include: a command to check service details regarding the electric vehicle device and the precise positioning and pairing method for wireless power transmission and to select a service; a command to perform precise positioning according to the precise positioning and pairing method associated with the selected service; a command to perform LF (Low Frequency) pairing according to the selected service; a command to perform an initial alignment check using pre-charging power transmission; and a command to perform LPE (Low Power Excitation) pairing according to the selected service and a result of performing the initial alignment check.

The power transmission control device (200) may further include an EV power circuit (230) that receives power provided by a power supply device; an EV communication controller (EVCC) (240) that communicates with the power supply device using wireless communication; and an EV device P2PS controller (250) that forms a P2PS connection with the power supply device using an LF (Low Frequency) signal.

Here, the EV Power Circuit can receive an LPE (Low Power Excitation) signal transmitted by the power supply device.

The command to perform an initial alignment check using the pre-charging power transfer may include a command to determine whether to renegotiate Wireless Power Transfer (WPT) precision positioning based on the pre-charging power received from the power supply device.

A command for determining whether to renegotiate WPT precision positioning based on the above pre-charge power may include a command for determining whether a minimum power transfer efficiency of the above pre-charge power is equal to or greater than a reference value; a command for determining that misalignment has occurred if the minimum power transfer efficiency is less than the reference value; and a command for determining whether to perform WPT precision positioning renegotiation based on the occurrence of misalignment.

At this time, the processor may re-execute a command to check the service details and select a service, a command to perform the precision positioning, and a command to perform the LF pairing, based on the decision to perform the WPT precision positioning renegotiation.

A command to perform LPE (Low Power Excitation) pairing according to the above-mentioned selected service and the result of the above-mentioned initial alignment check may be performed when the minimum power transfer efficiency is equal to or higher than a reference value.

Additionally, the service discovery response message provided by the power supply device for verifying the service details may include a parameter indicating whether service renegotiation is possible. Here, the service renegotiation may be triggered by the power supply device or the EV device during charging, or may be triggered when the power supply device and the EV device wake up from a charging pause period.

Figure 22 is a block diagram of a wireless power transmission device according to one embodiment of the present invention.

The wireless power transmission device (100) shown in the embodiment illustrated in Fig. 22 may be a power supply device. That is, the configuration of the wireless power transmission device (100) in this specification is not limited to the name, and may be defined by function. In addition, one configuration may perform multiple functions, and one function may be performed by multiple configurations.

A wireless power transmission device (100) may include at least one processor (110) and a memory (120) storing at least one command for executing the above-described operation through the processor.

The processor can execute program commands stored in the memory, and may mean a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor on which the methods according to the present invention are performed. The memory may be composed of a volatile storage medium and/or a nonvolatile storage medium, and may be composed of a read only memory (ROM) and/or a random access memory (RAM).

Here, the at least one command may include: a command to check a service status for a precise positioning and pairing method according to a service detail confirmation request from an electric vehicle device and to send a reply to the electric vehicle device; a command to perform precise positioning with the electric vehicle device according to a precise positioning and pairing method associated with a service selected by the electric vehicle device; a command to perform LF (Low Frequency) pairing according to the selected service; a command to transmit pre-charging power to be used for an initial alignment check to the electric vehicle device; and a command to perform LPE (Low Power Excitation) pairing according to a result of performing the selected service and the initial alignment check; and a command to transfer power to the electric vehicle device.

The wireless power transmission device (100) may further include a supply power circuit (SPC) (130) that transmits power to an EV device, a supply device communication controller (140) that communicates with the EV device using wireless communication, and a supply device P2PS controller (150) that forms a P2PS connection with the EV device using an LF signal.

The operation according to the embodiment of the present invention can be implemented as a computer-readable program or code on a computer-readable recording medium. The computer-readable recording medium includes all kinds of recording devices that store data that can be read by a computer system. In addition, the computer-readable recording medium can be distributed over network-connected computer systems so that the computer-readable program or code can be stored and executed in a distributed manner.

Additionally, the computer-readable recording medium may include hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, etc. The program instructions may include not only machine language codes produced by a compiler, but also high-level language codes that can be executed by the computer using an interpreter, etc.

While some aspects of the invention have been described in the context of an apparatus, they may also represent a description of a corresponding method, wherein a block or device corresponds to a method step or a feature of a method step. Similarly, aspects described in the context of a method may also be represented as a feature of a corresponding block or item or a corresponding device. Some or all of the method steps may be performed by (or using) a hardware device, such as, for example, a microprocessor, a programmable computer or an electronic circuit. In some embodiments, one or more of the most significant method steps may be performed by such a device.

In embodiments, a programmable logic device (e.g., a field programmable gate array) may be used to perform some or all of the functions of the methods described herein. In embodiments, the field programmable gate array may operate in conjunction with a microprocessor to perform one of the methods described herein. In general, the methods are preferably performed by some hardware device.

Although the present invention has been described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various modifications and changes may be made thereto without departing from the spirit and scope of the present invention as set forth in the claims below.

130: Supply power circuit (SPC)
140: Supply Device Communication Controller
150: Supply Device P2PS Controller
200: Electric vehicle device (EV device)
230: EV Power Circuit (EVPC)
240: EV Communication Controller (EVCC)
250: EV Device P2PS Controller

Claims (20)

A method for controlling wireless power transmission performed by an electric vehicle device (EV device) that receives power from a power supply device,
A step of checking service details regarding precise positioning and pairing methods between the power supply device and the electric vehicle device and selecting a service;
A step of performing precise positioning with the power supply device according to a pairing method associated with the selected service;
Step of performing LF (Low Frequency) pairing according to the selected service;
A step of performing an initial alignment check using pre-charging power transfer; and
A method for controlling wireless power transfer, comprising the step of performing LPE (Low Power Excitation) pairing according to the selected service and the result of performing the initial alignment check. In claim 1,
The step of performing an initial alignment check using the above pre-charge power transmission is:
A method for controlling wireless power transfer, comprising the step of determining whether to renegotiate WPT (Wireless Power Transfer) precision positioning based on pre-charge power received from a power supply device. In claim 2,
The step of determining whether to renegotiate WPT precision positioning based on the above pre-charge power is as follows:
A step of determining whether the minimum power transfer efficiency of the above pre-charging power is equal to or higher than a reference value;
A step for determining that misalignment has occurred when the minimum power transfer efficiency is below the standard value; and
A method for controlling wireless power transfer, comprising the step of determining whether to perform WPT precision positioning renegotiation based on the occurrence of misalignment. In claim 1,
A method for controlling wireless power transfer, wherein a service discovery response message provided by the power supply device to confirm the above service details includes a parameter indicating whether service renegotiation is possible. In claim 4,
The above service renegotiation is,
A method for controlling wireless power transfer, triggered by a charging loop message by the power supply device or a PowerDeliveryReq message by the electric vehicle device during charging. In claim 4,
The above service renegotiation is,
A method for controlling wireless power transfer, which is triggered when the power supply device and the EV device wake up from a charging pause period. In claim 2,
In accordance with the decision to conduct the above WPT precision positioning renegotiation,
A method for controlling wireless power transmission, comprising re-performing the steps of checking the above service details and selecting a service, performing the above precise positioning, and performing the above LF pairing. In claim 1,
After performing the above LF pairing step,
A method for controlling wireless power transfer, further comprising a step of performing authentication between the electric vehicle device and the power supply device. In claim 3,
A method for controlling wireless power transmission, wherein the step of performing LPE (Low Power Excitation) pairing according to the selected service and the initial alignment check result is performed when the minimum power transmission efficiency is equal to or higher than a reference value. As a power transmission control device for an electric vehicle device (EV device),
EV Power Circuit, which receives power provided by a power supply device;
processor; and
A memory comprising at least one instruction to be executed by the processor,
At least one of the above commands,
A command to check service details and select a service regarding a precise positioning and pairing method for wireless power transfer between the power supply device and the electric vehicle device;
A command to perform precision positioning according to the precision positioning and pairing method associated with the selected service;
A command to perform LF (Low Frequency) pairing depending on the selected service;
A command to perform an initial alignment check using pre-charging power transfer; and
A power transmission control device comprising a command to perform LPE (Low Power Excitation) pairing according to the selected service and the result of performing the initial alignment check. In claim 10,
An EV communication controller (EVCC) that communicates with the power supply device using wireless communication; and
A power transmission control device further comprising an EV device P2PS (Point to Point Signal) controller that forms a P2PS connection with the power supply device using an LF (Low Frequency) signal. In claim 10,
A power transmission control device, wherein the service discovery response message provided by the power supply device to confirm the above service details includes a parameter indicating whether service renegotiation is possible. In claim 12,
The above service renegotiation is,
A power transfer control device, which is triggered by the power supply device or the EV device during charging, or when the power supply device and the EV device wake up from a charging pause period. In claim 10,
A command to perform an initial alignment check using the above pre-charge power transfer,
A power transfer control device comprising a command to determine whether to renegotiate WPT (Wireless Power Transfer) precision positioning based on pre-charge power received from the power supply device. In claim 14,
A command to determine whether to renegotiate WPT precision positioning based on the above pre-charge power is:
A command to determine whether the minimum power transfer efficiency of the above pre-charge power is equal to or greater than a reference value;
A command to determine that misalignment has occurred when the minimum power transfer efficiency is below the reference value; and
A power transmission control device comprising a command to determine whether to perform WPT precision positioning renegotiation in response to a misalignment occurrence. In claim 14,
The above processor,
A power transmission control device that re-executes a command to check the service details and select a service, a command to perform the precision positioning, and a command to perform the LF pairing according to a decision to perform the above WPT precision positioning renegotiation. A wireless power transmission method performed by a power supply device that supplies power to an electric vehicle device (EV Device),
A step of checking the service status for precise positioning and pairing method according to a service detail confirmation request from the electric vehicle device and replying to the electric vehicle device;
A step of performing precision positioning with the electric vehicle device according to a precision positioning and pairing method associated with a service selected by the electric vehicle device;
A step of performing LF (Low Frequency) pairing according to the selected service;
A step of transmitting pre-charging power to the electric vehicle device to be used for initial alignment check;
A step of performing LPE (Low Power Excitation) pairing according to the results of the above-mentioned selected service and initial alignment check; and
A method for wireless power transmission, comprising the step of transmitting power to the electric vehicle device. In claim 17,
A method for wireless power transfer, wherein whether to renegotiate WPT (Wireless Power Transfer) precision positioning is determined by the electric vehicle device based on the pre-charge power. In claim 18,
In accordance with the decision to conduct WPT precision positioning renegotiation,
A wireless power transmission method, which re-performs the steps of checking and responding to the above service status, performing the above precise positioning, and performing the above LF pairing. In claim 17,
The service discovery response message provided by the power supply device to confirm the above service details includes a parameter indicating whether service renegotiation is possible.
A method of wireless power transfer, wherein said service renegotiation is triggered by said power supply device or said EV device during charging, or when said power supply device and said EV device wake up from a charging pause period.

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