CN215728732U - Electric automobile PE broken string detection circuitry and electric vehicle - Google Patents
Electric automobile PE broken string detection circuitry and electric vehicle Download PDFInfo
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- CN215728732U CN215728732U CN202121756305.7U CN202121756305U CN215728732U CN 215728732 U CN215728732 U CN 215728732U CN 202121756305 U CN202121756305 U CN 202121756305U CN 215728732 U CN215728732 U CN 215728732U
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Abstract
The utility model provides a PE (polyethylene) disconnection detection circuit of an electric automobile and the electric automobile, and relates to the technical field of electric automobiles, wherein the PE disconnection detection circuit of the electric automobile comprises a central processing unit, a voltage switch, a first resistor and a second resistor; the first resistor and the second resistor mainly play a role in voltage division, when the charging gun is inserted into the electric automobile charging gun socket, and the central processing unit outputs a preset square wave through the enable output end, if any position between the grounding end of the charging gun, the grounding end of the electric automobile charging gun socket and the grounding end of the electric automobile communication controller is in a broken circuit state, the waveform of the target signal is in a distortion state compared with the waveform of the preset square wave. Therefore, the PE disconnection detection circuit for the electric automobile can detect the connection condition of the grounding end, and effectively improves the charging safety of the electric automobile.
Description
Technical Field
The utility model relates to the technical field of electric automobiles, in particular to a PE (polyethylene) disconnection detection circuit of an electric automobile and the electric automobile.
Background
The EVCC (Electric Vehicle Communication Controller) is mainly used for communicating with a Power Supply Equipment (EVSE) to coordinate a charging protocol, charging control and acquisition of a charging state. The EVCC controller needs to be connected with the power supply equipment in a common ground (PE) mode through a charging socket and a charging gun to guarantee normal operation of the equipment, and if the PE is disconnected, the charging function is affected and even potential safety hazards are brought.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a PE (polyethylene) disconnection detection circuit of an electric automobile and the electric automobile, which are used for detecting the connection condition of a grounding end and improving the charging safety of the electric automobile.
In a first aspect, the present invention provides a PE disconnection detection circuit for an electric vehicle, including: the circuit comprises a central processing unit, a voltage switch, a first resistor and a second resistor; the first end of the voltage switch is connected with a power supply, the second end of the voltage switch is connected with the enable output end of the central processing unit, and the third end of the voltage switch is connected with the first end of the first resistor; the second end of the first resistor is connected with the gun insertion detection end of the central processing and the first end of the second resistor respectively, and the second end of the second resistor is connected with the grounding end of the electric automobile charging gun socket; when a charging gun is inserted into the electric automobile charging gun socket, the gun insertion detection end of the central processing is connected with a first end of a first preset resistor in the charging gun; the second end of the first preset resistor is connected with the grounding end of the charging gun; the central processing unit outputs a preset square wave through the enable output end, receives a target signal fed back by the insertion gun detection end, and determines that the grounding end of the electric automobile charging gun socket and the grounding end of the charging gun are in a circuit breaking state and/or the grounding end of the electric automobile charging gun socket and the grounding end of the electric automobile communication controller are in a circuit breaking state under the condition that the waveform of the target signal is inconsistent with the waveform of the preset square wave.
In an optional embodiment, the electric vehicle PE disconnection detection circuit further includes: a third resistor; the first end of the third resistor is connected with the grounding end of the electric vehicle communication controller, and the second end of the third resistor is respectively connected with the grounding detection end of the central processing unit and the grounding end of the electric vehicle charging gun socket; and when the amplitude of the signal fed back by the grounding detection end of the central processing unit is within a first preset range, determining that the grounding end of the electric automobile charging gun socket and the grounding end of the electric automobile communication controller are in an open circuit state.
In an optional embodiment, the electric vehicle PE disconnection detection circuit further includes: a fourth resistor; the first end of the fourth resistor is connected with the control guide detection end of the central processing unit, and the second end of the fourth resistor is connected with the grounding end of the electric automobile communication controller; when the charging gun is inserted into the charging gun socket of the electric automobile, the control guide detection end is connected with the output end of power supply equipment for providing the charging gun; the central processing unit controls the voltage switch to be in a normally-on state through the enabling output end, and when the amplitude of a target signal fed back by a gun inserting detection end of the central processing unit is within a second preset range and the amplitude of a signal fed back by a control guide detection end is equal to 0, the grounding end of the charging gun and the grounding end of the power supply equipment are determined to be in an open circuit state.
In an optional embodiment, the electric vehicle PE disconnection detection circuit further includes: a first impedance conversion circuit and a second impedance conversion circuit; the first end of the first impedance transformation circuit is connected with the insertion gun detection end, and the second end of the first impedance transformation circuit is connected with the second end of the first resistor; and the first end of the second impedance transformation circuit is connected with the control guide detection end, and the second end of the second impedance transformation circuit is connected with the first end of the fourth resistor.
In an optional embodiment, the electric vehicle PE disconnection detection circuit further includes: a first filter circuit and a second filter circuit; the first end of the first filter circuit is connected with the insertion gun detection end, and the second end of the first filter circuit is connected with the first end of the first impedance transformation circuit; and the first end of the second filter circuit is connected with the control guide detection end, and the second end of the second filter circuit is connected with the first end of the second impedance transformation circuit.
In an optional embodiment, the electric vehicle PE disconnection detection circuit further includes: a voltage dividing circuit; the voltage dividing circuit includes: a fifth resistor and a sixth resistor; the first end of the fifth resistor is connected with the first end of the fourth resistor; a second end of the fifth resistor is connected with a second end of the second impedance transformation circuit and a first end of the sixth resistor respectively; and the second end of the sixth resistor is connected with the grounding end of the electric automobile communication controller.
In an optional embodiment, the electric vehicle PE disconnection detection circuit further includes: a diode; the cathode of the diode is connected with the first end of the fourth resistor; when the charging gun is inserted into the charging gun socket of the electric automobile, the anode of the diode is connected with the output end of the power supply equipment.
In an alternative embodiment, the first impedance transformation circuit includes: a first voltage follower; the second impedance transformation circuit includes: a second voltage follower.
In an alternative embodiment, the first filtering circuit includes: a seventh resistor and a first capacitor; the second filter circuit includes: an eighth resistor and a second capacitor; a first end of the seventh resistor is connected with the gun insertion detection end and a first end of the first capacitor respectively, and a second end of the seventh resistor is connected with a first end of the first impedance transformation circuit; the second end of the first capacitor is connected with the grounding end of the electric automobile communication controller; a first end of the eighth resistor is connected with the control guide detection end and a first end of the second capacitor respectively, and a second end of the eighth resistor is connected with a first end of the second impedance transformation circuit; and the second end of the second capacitor is connected with the grounding end of the electric automobile communication controller.
In a second aspect, the present invention provides an electric vehicle to which the electric vehicle PE disconnection detection circuit according to any one of the foregoing embodiments is applied.
The utility model provides a PE disconnection detection circuit of an electric vehicle, which comprises: the circuit comprises a central processing unit, a voltage switch, a first resistor and a second resistor; the first end of the voltage switch is connected with the power supply, the second end of the voltage switch is connected with the enable output end of the central processing unit, and the third end of the voltage switch is connected with the first end of the first resistor; the second end of the first resistor is connected with the gun insertion detection end of the central processing unit and the first end of the second resistor respectively, and the second end of the second resistor is connected with the grounding end of the electric automobile charging gun socket; when the charging gun is inserted into the charging gun socket of the electric automobile, the gun insertion detection end of the central processing is connected with the first end of a first preset resistor in the charging gun; the second end of the first preset resistor is connected with the grounding end of the charging gun; the central processing unit outputs a preset square wave through the enable output end, receives a target signal fed back by the insertion gun detection end, and determines that the grounding end of the electric automobile charging gun socket and the grounding end of the charging gun are in an open circuit state and/or the grounding end of the electric automobile charging gun socket and the grounding end of the electric automobile communication controller are in an open circuit state under the condition that the waveform of the target signal is inconsistent with the waveform of the preset square wave.
In the PE wire breakage detection circuit for the electric automobile, the first resistor and the second resistor mainly play a role in voltage division, when a charging gun is inserted into a charging gun socket of the electric automobile and a central processing unit outputs a preset square wave through an enable output end, if a grounding end of the charging gun, a grounding end of the charging gun socket of the electric automobile and a grounding end of a communication controller of the electric automobile are in a connected state, a waveform of a target signal fed back by a detection end of the plugging gun is consistent with a waveform of the preset square wave; if any one of the grounding end of the charging gun, the grounding end of the electric vehicle charging gun socket and the grounding end of the electric vehicle communication controller is in an open circuit state, the waveform of the target signal is distorted compared with the waveform of the preset square wave. Therefore, the PE disconnection detection circuit for the electric automobile can detect the connection condition of the grounding end, and effectively improves the charging safety of the electric automobile.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic block diagram of a PE disconnection detection circuit of an electric vehicle according to an embodiment of the present invention;
fig. 2 is an equivalent circuit diagram of a charging gun, an electric vehicle charging gun socket, and an electric vehicle communication controller when a ground terminal of the electric vehicle charging gun socket and a ground terminal of the charging gun according to an embodiment of the present invention are disconnected;
fig. 3 is a schematic block diagram of another PE disconnection detecting circuit for an electric vehicle according to an embodiment of the present invention;
fig. 4 is a schematic block diagram of an optional PE disconnection detection circuit for an electric vehicle according to an embodiment of the present invention;
fig. 5 is a schematic block diagram of another optional PE disconnection detecting circuit for an electric vehicle according to an embodiment of the present invention;
fig. 6 is a schematic block diagram of a PE disconnection detecting circuit of an electric vehicle provided with an impedance transformation circuit according to an embodiment of the present invention;
fig. 7 is a schematic block diagram of a PE disconnection detection circuit of an electric vehicle with a filtering function according to an embodiment of the present invention;
fig. 8 is a schematic block diagram of a PE disconnection detecting circuit of an electric vehicle provided with a voltage dividing circuit according to an embodiment of the present invention;
fig. 9 is a schematic block diagram of a PE disconnection detection circuit of an electric vehicle with a backflow prevention function according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Some embodiments of the utility model are described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
When a charging gun of a power supply device (such as a charging pile) is inserted into an electric vehicle to prepare for charging the electric vehicle, if any PE among an EVCC controller, a charging socket, the charging gun and the power supply device is disconnected, the charging function is affected and even potential safety hazards are brought. However, in the prior art, the EVCC does not perform the disconnection detection of the PE during the charging of the electric vehicle, and the charging safety is low, in view of this, the embodiment of the present invention provides a disconnection detection circuit for a PE of an electric vehicle, so as to alleviate the above-mentioned technical problems.
Example one
Fig. 1 is a schematic block diagram of a PE disconnection detection circuit of an electric vehicle according to an embodiment of the present invention, and as shown in fig. 1, the PE disconnection detection circuit of the electric vehicle includes: the circuit comprises a central processing unit MCU, a voltage switch Q, a first resistor R1 and a second resistor R2.
The first end of the voltage switch Q is connected with a power supply VCC, the second end of the voltage switch Q is connected with an enable output end EN of the central processing unit MCU, and the third end of the voltage switch Q is connected with the first end of a first resistor R1; the second end of the first resistor R1 is respectively connected with the gun insertion detection end PP of the central processing and the first end of the second resistor R2, and the second end of the second resistor R2 is connected with the grounding end of the charging gun socket Inlet of the electric automobile.
When the charging gun Plug is inserted into the charging gun socket Inlet of the electric automobile, the gun insertion detection end PP of the central processing is connected with the first end of a first preset resistor Rpp in the charging gun Plug; the second end of the first preset resistor Rpp is connected with the grounding end of the Plug of the charging gun.
The central processing unit MCU outputs a preset square wave through the enable output end EN, receives a target signal fed back by the gun plugging detection end PP, and determines that the grounding end of the electric automobile charging gun socket Inlet and the grounding end of the charging gun Plug are in an open circuit state and/or the grounding end of the electric automobile charging gun socket Inlet and the grounding end of the electric automobile communication controller EVCC are in an open circuit state under the condition that the waveform of the target signal is inconsistent with the waveform of the preset square wave.
As can be seen from the above description of the circuit connection relationship among the constituent structures in the PE disconnection detection circuit of the electric vehicle, the central processing unit MCU can control the on/off of the voltage switch Q by the level value output by the enable output terminal EN, in the embodiment of the present invention, the voltage switch Q can select a P-channel MOSFET, and when the enable output terminal EN outputs a low level, the voltage switch Q is in a conducting state; when the enable output terminal EN outputs a high level, the voltage switch Q is in an off state.
Generally, the internal circuit of the charging gun Plug of the power supply equipment EVSE may be equivalent to a resistor (the first preset resistor Rpp in the above description), so that when the charging gun Plug is inserted into the charging gun socket Inlet of the electric vehicle, the first end of the first preset resistor Rpp is respectively connected to the second end of the first resistor R1, the first end of the second resistor R2, and the centrally-processed gun Plug detection terminal PP, and the second end of the first preset resistor Rpp is connected to the ground terminal of the charging gun Plug, and therefore, in the embodiment of the present invention, the target signal fed back by the gun Plug detection terminal PP of the central processing unit MCU is the node voltage signal of the second end of the first resistor R1.
When the grounding end of the EVCC, the grounding end of the Inlet and the grounding end of the Plug of the charging gun of the electric automobile are connected in common (in a connected state) and the voltage switch Q is in a conducting state, the first resistor R1, the second resistor R2 and the first preset resistor Rpp form a voltage division circuit, and a voltage signal fed back by the PP is calculated according to the resistance values of the three resistors and the voltage of the power supply VCC; when the voltage switch Q is in the off state, the voltage detected by the lance detection terminal PP should be 0. Therefore, if the central processing unit MCU outputs the preset square wave through the enable output terminal EN, and the ground terminal of the electric vehicle communication controller EVCC, the ground terminal of the electric vehicle charging gun socket Inlet, and the ground terminal of the charging gun Plug are connected in common, the waveform of the target signal fed back by the gun plugging detection terminal PP should be identical to the waveform of the preset square wave (without considering the amplitude), and at this time, the electric vehicle communication controller EVCC determines that the charging gun Plug is plugged.
When any one of the grounding ends of the EVCC, the Inlet and the Plug of the charging gun of the electric automobile is in an open circuit state, the circuit has a capacitance to ground. Taking the example that the grounding end of the charging gun socket Inlet of the electric vehicle and the grounding end of the charging gun Plug are open-circuited, the equivalent circuit is shown in fig. 2, the ground capacitance Cx in fig. 2 is the equivalent Y capacitance of the electric vehicle, and the actual capacitance value is related to the vehicle type.
When the voltage switch Q is in the on state, the voltage detected by the lance detection end PP will slowly increase to a certain amplitude due to the influence of the capacitor charging, and when the voltage switch Q is in the off state, the voltage detected by the lance detection end PP will slowly decrease to 0 due to the influence of the capacitor discharging. Therefore, if any one of the grounding end of the charging gun Plug, the grounding end of the electric vehicle charging gun socket Inlet and the grounding end of the electric vehicle communication controller EVCC is in an open circuit state, the waveform of the target signal fed back by the Plug gun detection end PP is distorted compared with the waveform of the preset square wave, and at the moment, the electric vehicle communication controller EVCC determines that the charging gun Plug is inserted, and outputs a wire-break alarm signal.
In addition, when the electric vehicle communication controller EVCC is awakened and the charging gun Plug is not inserted, if the central processing unit MCU outputs the preset square wave through the enable output terminal EN and the waveform of the target signal fed back by the gun insertion detection terminal PP is consistent with the waveform of the preset square wave, it can be said that the charging gun Plug is not inserted into the electric vehicle charging gun socket Inlet. Since only the first resistor R1 and the second resistor R2 form a voltage divider circuit, the voltage signal fed back by the lance detection end PP can be calculated according to the resistances of the first resistor R1 and the second resistor R2 and the voltage of the power source VCC.
In the PE wire breakage detection circuit for the electric automobile, provided by the embodiment of the utility model, the first resistor R1 and the second resistor R2 mainly play a role in voltage division, when the charging gun Plug is inserted into the charging gun socket Inlet of the electric automobile and the central processing unit MCU outputs a preset square wave through the enable output end EN, if the grounding end of the charging gun Plug, the grounding end of the charging gun socket Inlet of the electric automobile and the grounding end of the electric automobile communication controller EVCC are in a connected state, the waveform of a target signal fed back by the gun insertion detection end PP is consistent with the waveform of the preset square wave; if any position between the grounding end of the charging gun Plug, the grounding end of the electric vehicle charging gun socket Inlet and the grounding end of the electric vehicle communication controller EVCC is in an open circuit state, the waveform of the target signal is distorted compared with the waveform of the preset square wave. Therefore, the PE disconnection detection circuit for the electric automobile provided by the embodiment of the utility model can detect the connection condition of the grounding end, and effectively improves the charging safety of the electric automobile.
In order to further determine whether the PE is disconnected, and determine whether the ground terminal of the charging gun socket Inlet of the electric vehicle and the ground terminal of the communication controller EVCC of the electric vehicle are disconnected, in an optional embodiment, as shown in fig. 3, the PE disconnection detecting circuit of the electric vehicle further includes: and a third resistor R3.
The first end of the third resistor R3 is connected with the grounding end of the EVCC, and the second end of the third resistor R3 is respectively connected with the grounding detection end PE _ DET of the CPU MCU and the grounding end of the Inlet of the charging gun socket of the electric vehicle.
When the signal amplitude fed back by the grounding detection end PE _ DET of the central processing unit MCU is in a first preset range, the grounding end of the electric automobile charging gun socket Inlet and the grounding end of the electric automobile communication controller EVCC are determined to be in an open circuit state.
Specifically, the ground detection end PE _ DET of the central processing unit MCU is connected to the second end of the third resistor R3 and the ground end of the electric vehicle charging gun socket Inlet, that is, when the ground end of the electric vehicle charging gun socket Inlet and the ground end of the electric vehicle communication controller EVCC are in a connection state, the ground detection end PE _ DET of the central processing unit MCU is equivalent to direct ground connection, and the amplitude of the signal fed back by the ground detection end PE _ DET of the central processing unit MCU should be 0.
When the grounding end of the electric vehicle charging gun socket Inlet and the grounding end of the electric vehicle communication controller EVCC are in an open circuit state, the first resistor R1, the second resistor R2 and the third resistor R3 form a series circuit, and when the central processing unit MCU controls the voltage switch Q to be switched on, the amplitude of a signal fed back by the grounding detection end PE _ DET of the central processing unit MCU is a divided voltage value of the third resistor R3. Therefore, when the amplitude of the signal fed back by the ground detection end PE _ DET of the central processing unit MCU is within the first preset range, it is determined that the ground terminal of the electric vehicle charging gun socket Inlet and the ground terminal of the electric vehicle communication controller EVCC are in an open circuit state. The first preset range is not specifically limited in the embodiment of the present invention, and the user may set the first preset range after the determination according to the actual situation, for example, the conclusion may be obtained as long as the amplitude of the signal fed back by the ground detection end PE _ DET is greater than 0.3V.
In order to clearly position the PE wire break condition, the connection state between the grounding end of the electric vehicle charging gun socket Inlet and the grounding end of the electric vehicle communication controller EVCC can be judged through the signal amplitude fed back by the grounding detection end PE _ DET of the central processing unit MCU, if the connection is confirmed, the enable output end EN is used for outputting a preset square wave, and if the waveform of a target signal fed back by the gun plugging detection end PP is inconsistent with the waveform of the preset square wave, the grounding end of the electric vehicle charging gun socket Inlet and the grounding end of the charging gun ug are proved to be in a circuit break state.
When the grounding end of the charging gun Plug, the grounding end of the electric vehicle charging gun socket Inlet and the grounding end of the electric vehicle communication controller EVCC are in a connected state, the connection state between the grounding end of the charging gun Plug and the grounding end of the power supply equipment EVSE needs to be further judged. Therefore, in an alternative embodiment, referring to fig. 4 and 5, the electric vehicle PE disconnection detecting circuit further includes: and a fourth resistor R4.
The first end of the fourth resistor R4 is connected with the control guide detection end CP of the CPU MCU, and the second end of the fourth resistor R4 is connected with the grounding end of the EVCC.
When the charging gun Plug is inserted into the charging gun socket Inlet of the electric automobile, the control guide detection end CP is connected with the output end of the power supply equipment EVSE providing the charging gun Plug.
The central processing unit MCU is in a normally-on state through the enable output end EN to control the voltage switch Q, when the amplitude of a target signal fed back by the gun inserting detection end PP of the central processing unit MCU is in a second preset range, and the amplitude of a signal fed back by the control guide detection end CP is equal to 0, the grounding end of the charging gun Plug and the grounding end of the power supply equipment EVSE are determined to be in an open circuit state.
Generally, a preset power supply VB is arranged inside the power supply equipment EVSE, and the power supply equipment EVSE is connected in series with a second preset resistor Rx, a first end of the second preset resistor Rx is connected with the preset power supply VB, and a second end of the second preset resistor Rx is connected with a CP output end of the power supply equipment EVSE.
As can be known from the above-described circuit connection relationship, when the charging gun Plug is inserted into the charging gun socket Inlet of the electric vehicle, if the ground terminal of the charging gun Plug, the ground terminal of the charging gun socket Inlet of the electric vehicle and the ground terminal of the communication controller EVCC of the electric vehicle are in a connected state, and the central processing unit MCU controls the voltage switch Q to be in a normally-on state through the enable output terminal EN, at this time, the first resistor R1, the second resistor R2 and the first preset resistor Rpp form a voltage divider circuit, the amplitude of the target signal fed back by the gun insertion detection terminal PP of the central processing unit MCU should be the node voltage signal of the second terminal of the first resistor R1, and the amplitude of the voltage signal needs to be determined according to the voltage of the power source VCC, the first resistor R1, the second resistor R2 and the first preset resistor Rpp. Therefore, if the target signal amplitude is within the second preset range, it may be determined that the ground terminal of the charging gun Plug, the ground terminal of the electric vehicle charging gun socket Inlet, and the ground terminal of the electric vehicle communication controller EVCC are in a connected state.
Further, when the charging gun Plug is inserted into the charging gun socket Inlet of the electric vehicle, if the grounding end of the charging gun Plug is also in a connected state with the grounding end of the power supply equipment EVSE, under the voltage division action of the second preset resistor Rx and the fourth resistor R4, the control of the central processing unit MCU guides the amplitude of the signal fed back by the detection end CP to be the node voltage amplitude of the first end of the fourth resistor R4; on the contrary, if the amplitude of the signal fed back by the control guide detection end CP is equal to 0, it indicates that the grounding end of the charging gun Plug and the grounding end of the power supply equipment EVSE are in an open circuit state.
The circuit structure capable of completely detecting the PE disconnection is described in detail above, and other alternative embodiments capable of assisting in improving the circuit performance are described below.
In an alternative embodiment, as shown in fig. 6, the PE disconnection detecting circuit of the electric vehicle further includes: a first impedance conversion circuit AD1 and a second impedance conversion circuit AD 2.
A first end of the first impedance conversion circuit AD1 is connected with the gun insertion detection end PP, and a second end of the first impedance conversion circuit AD1 is connected with a second end of the first resistor R1; a first terminal of the second impedance conversion circuit AD2 is connected to the control pilot detection terminal CP, and a second terminal of the second impedance conversion circuit AD2 is connected to a first terminal of the fourth resistor R4.
Specifically, in order to improve the acquisition accuracy of the ADC of the cpu MCU and reduce the acquisition error of the ADC, a first impedance transformation circuit AD1 and a second impedance transformation circuit AD2 are respectively added before the insertion detection end PP and the control guidance detection end CP of the cpu MCU access signals, and the impedance transformation circuits play a role of impedance matching on one hand and also play a role of impedance isolation on the other hand.
Considering that the voltage follower has the characteristics of high input resistance and low output resistance, in an alternative embodiment, the first impedance transformation circuit AD1 includes: a first voltage follower; the second impedance conversion circuit AD2 includes: the second voltage follower, i.e. the voltage follower, is used to perform the function of impedance transformation. The type of the voltage follower can be selected from an emitter follower consisting of a transistor or a voltage follower consisting of an operational amplifier circuit.
In view of the possibility of high-frequency noise during signal transmission, which may affect the determination of the signal amplitude, in an alternative embodiment, as shown in fig. 7, the circuit for detecting PE disconnection of an electric vehicle further includes: a first filter circuit RC1 and a second filter circuit RC 2.
A first end of the first filter circuit RC1 is connected with the pistol inserting detection end PP, and a second end of the first filter circuit RC1 is connected with a first end of the first impedance transformation circuit AD 1; a first terminal of the second filter circuit RC2 is connected to the control pilot detection terminal CP, and a second terminal of the second filter circuit RC2 is connected to a first terminal of the second impedance transformation circuit AD 2. In other words, before the gun insertion detection end PP and the control leading detection end CP of the cpu MCU access the signals, the filtering is performed again, in the embodiment of the present invention, both the first filter circuit RC1 and the second filter circuit RC2 are equivalent to a low pass filter, that is, pass low frequency signals and block high frequency signals.
As can be seen from the above description, when the Plug of the charging gun is inserted into the Plug of the charging gun socket Inlet of the electric vehicle, the output terminal of the power supply unit EVSE is connected to the control guiding detection terminal CP of the central processing unit MCU, and the power supply unit EVSE is internally provided with the preset power supply VB, in order to ensure that the control guiding terminal of the central processing unit MCU is not damaged by the high voltage, in an optional embodiment, as shown in fig. 8, the circuit for detecting the disconnection of the PE of the electric vehicle further includes: a voltage dividing circuit; the voltage dividing circuit includes: a fifth resistor R5 and a sixth resistor R6.
A first end of the fifth resistor R5 is connected with a first end of the fourth resistor R4; a second end of the fifth resistor R5 is connected to a second end of the second impedance transformation circuit AD2 and a first end of the sixth resistor R6, respectively; a second end of the sixth resistor R6 is connected to the ground terminal of the electric vehicle communication controller EVCC. The voltage amplitude of the access control leading end can be reduced to a certain extent through the voltage division of the fifth resistor R5 and the sixth resistor R6, the resistance values of the fifth resistor R5 and the sixth resistor R6 are not specifically limited in the embodiment of the utility model, and a user can select the resistance values according to actual conditions.
Further, in order to prevent the voltage from flowing backwards, as shown in fig. 9, the PE disconnection detecting circuit of the electric vehicle further includes: a diode D; the cathode of the diode D is connected to a first terminal of a fourth resistor R4. When the charging gun Plug is inserted into the charging gun socket Inlet of the electric automobile, the anode of the diode D is connected with the output end of the power supply equipment EVSE.
Through the circuit with the diode D, one-way conduction of the circuit is achieved, the amplitude detection of the CP is not affected after the circuit is designed, voltage backflow is avoided, and the use safety of the power supply equipment EVSE is improved.
In an alternative embodiment, the first filter circuit RC1 includes: a seventh resistor and a first capacitor; the second filter circuit RC2 includes: an eighth resistor and a second capacitor.
The first end of the seventh resistor is connected with the gun insertion detection end PP and the first end of the first capacitor respectively, and the second end of the seventh resistor is connected with the first end of the first impedance conversion circuit AD 1; and the second end of the first capacitor is connected with the grounding end of the electric automobile communication controller EVCC.
A first end of the eighth resistor is connected with the control guide detection end CP and the first end of the second capacitor respectively, and a second end of the eighth resistor is connected with a first end of the second impedance conversion circuit AD 2; and the second end of the second capacitor is connected with the grounding end of the electric automobile communication controller EVCC.
Specifically, the first filter circuit RC1 and the second filter circuit RC2 in the embodiment of the present invention both use RC filter circuits, and the values of the seventh resistor, the eighth resistor, the first capacitor, and the second capacitor are not specifically limited in the embodiment of the present invention, and a user may select the values according to actual needs.
In summary, the embodiment of the present invention provides a PE disconnection detecting circuit for an electric vehicle, which can detect disconnection at any position between a ground terminal of a power supply device, a ground terminal of a charging gun socket of the electric vehicle, and a ground terminal of a communication controller of the electric vehicle, thereby effectively improving charging safety of the electric vehicle.
Example two
The embodiment of the utility model also provides an electric vehicle, wherein the electric vehicle adopts any one of the PE disconnection detection circuits of the electric vehicle in the first embodiment.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element to which the description refers must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides an electric automobile PE detection circuitry that breaks, characterized in that includes: the circuit comprises a central processing unit, a voltage switch, a first resistor and a second resistor;
the first end of the voltage switch is connected with a power supply, the second end of the voltage switch is connected with the enable output end of the central processing unit, and the third end of the voltage switch is connected with the first end of the first resistor; the second end of the first resistor is connected with the gun insertion detection end of the central processing and the first end of the second resistor respectively, and the second end of the second resistor is connected with the grounding end of the electric automobile charging gun socket;
when a charging gun is inserted into the electric automobile charging gun socket, the gun insertion detection end of the central processing is connected with a first end of a first preset resistor in the charging gun; the second end of the first preset resistor is connected with the grounding end of the charging gun;
the central processing unit outputs a preset square wave through the enable output end, receives a target signal fed back by the insertion gun detection end, and determines that the grounding end of the electric automobile charging gun socket and the grounding end of the charging gun are in a circuit breaking state and/or the grounding end of the electric automobile charging gun socket and the grounding end of the electric automobile communication controller are in a circuit breaking state under the condition that the waveform of the target signal is inconsistent with the waveform of the preset square wave.
2. The PE disconnection detection circuit for an electric vehicle of claim 1, further comprising: a third resistor;
the first end of the third resistor is connected with the grounding end of the electric vehicle communication controller, and the second end of the third resistor is respectively connected with the grounding detection end of the central processing unit and the grounding end of the electric vehicle charging gun socket;
and when the amplitude of the signal fed back by the grounding detection end of the central processing unit is within a first preset range, determining that the grounding end of the electric automobile charging gun socket and the grounding end of the electric automobile communication controller are in an open circuit state.
3. The PE disconnection detection circuit for the electric vehicle according to claim 1 or 2, wherein the PE disconnection detection circuit for the electric vehicle further comprises: a fourth resistor;
the first end of the fourth resistor is connected with the control guide detection end of the central processing unit, and the second end of the fourth resistor is connected with the grounding end of the electric automobile communication controller;
when the charging gun is inserted into the charging gun socket of the electric automobile, the control guide detection end is connected with the output end of power supply equipment for providing the charging gun;
the central processing unit controls the voltage switch to be in a normally-on state through the enabling output end, and when the amplitude of a target signal fed back by a gun inserting detection end of the central processing unit is within a second preset range and the amplitude of a signal fed back by a control guide detection end is equal to 0, the grounding end of the charging gun and the grounding end of the power supply equipment are determined to be in an open circuit state.
4. The PE disconnection detection circuit for an electric vehicle of claim 3, further comprising: a first impedance conversion circuit and a second impedance conversion circuit;
the first end of the first impedance transformation circuit is connected with the insertion gun detection end, and the second end of the first impedance transformation circuit is connected with the second end of the first resistor;
and the first end of the second impedance transformation circuit is connected with the control guide detection end, and the second end of the second impedance transformation circuit is connected with the first end of the fourth resistor.
5. The PE disconnection detection circuit for an electric vehicle of claim 4, further comprising: a first filter circuit and a second filter circuit;
the first end of the first filter circuit is connected with the insertion gun detection end, and the second end of the first filter circuit is connected with the first end of the first impedance transformation circuit;
and the first end of the second filter circuit is connected with the control guide detection end, and the second end of the second filter circuit is connected with the first end of the second impedance transformation circuit.
6. The PE disconnection detection circuit for an electric vehicle of claim 5, further comprising: a voltage dividing circuit; the voltage dividing circuit includes: a fifth resistor and a sixth resistor;
the first end of the fifth resistor is connected with the first end of the fourth resistor; a second end of the fifth resistor is connected with a second end of the second impedance transformation circuit and a first end of the sixth resistor respectively; and the second end of the sixth resistor is connected with the grounding end of the electric automobile communication controller.
7. The PE disconnection detection circuit for an electric vehicle of claim 6, further comprising: a diode; the cathode of the diode is connected with the first end of the fourth resistor;
when the charging gun is inserted into the charging gun socket of the electric automobile, the anode of the diode is connected with the output end of the power supply equipment.
8. The PE disconnection detection circuit for an electric vehicle according to claim 4, wherein the first impedance transformation circuit comprises: a first voltage follower; the second impedance transformation circuit includes: a second voltage follower.
9. The PE disconnection detection circuit for an electric vehicle of claim 5, wherein the first filter circuit comprises: a seventh resistor and a first capacitor; the second filter circuit includes: an eighth resistor and a second capacitor;
a first end of the seventh resistor is connected with the gun insertion detection end and a first end of the first capacitor respectively, and a second end of the seventh resistor is connected with a first end of the first impedance transformation circuit; the second end of the first capacitor is connected with the grounding end of the electric automobile communication controller;
a first end of the eighth resistor is connected with the control guide detection end and a first end of the second capacitor respectively, and a second end of the eighth resistor is connected with a first end of the second impedance transformation circuit; and the second end of the second capacitor is connected with the grounding end of the electric automobile communication controller.
10. An electric vehicle, characterized in that the electric vehicle employs the PE disconnection detection circuit of the electric vehicle of any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121756305.7U CN215728732U (en) | 2021-07-29 | 2021-07-29 | Electric automobile PE broken string detection circuitry and electric vehicle |
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| CN202121756305.7U CN215728732U (en) | 2021-07-29 | 2021-07-29 | Electric automobile PE broken string detection circuitry and electric vehicle |
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| CN215728732U true CN215728732U (en) | 2022-02-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024031324A1 (en) * | 2022-08-09 | 2024-02-15 | 宁德时代新能源科技股份有限公司 | Interface circuit, electric device, detection method, system, medium, and program product |
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2021
- 2021-07-29 CN CN202121756305.7U patent/CN215728732U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024031324A1 (en) * | 2022-08-09 | 2024-02-15 | 宁德时代新能源科技股份有限公司 | Interface circuit, electric device, detection method, system, medium, and program product |
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