WO2018166449A1

WO2018166449A1 - Short-circuit protection circuit, power adapter, and mobile terminal

Info

Publication number: WO2018166449A1
Application number: PCT/CN2018/078872
Authority: WO
Inventors: 杨波
Original assignee: 广东欧珀移动通信有限公司
Priority date: 2017-03-14
Filing date: 2018-03-13
Publication date: 2018-09-20

Abstract

A short-circuit protection circuit (10), a power adapter, and a mobile terminal. The short-circuit protection circuit comprises a switch device (11), a control circuit (12), an acquisition circuit (13), a reference circuit (14), and a current transformer (15). A first end (111) of the switch device (11) is connected with a high-voltage reference ground end of the power adapter; a second end (112) of the switch device (11) is connected with a first end of a first capacitor (C1) of the power adaptor by means of an input coil (51) of the current transformer (15); a second end of the first capacitor (C1) is connected with a low-voltage reference ground end or low-voltage positive electrode of the power adapter; a third end (113) of the switch device (11) is connected with a control end (123) of the control circuit (12); a first detection end (121) of the control circuit (12) is connected with an output end (132) of the acquisition circuit (13); a first input end (131) of the acquisition circuit (13) is connected to one end of an output coil (52) of the current transformer (15); a second input end (133) of the acquisition circuit (13) is connected to the other end of the output coil (52) of the current transformer (15); a second detection end (122) of the control circuit (12) is connected with an output end (141) of the reference circuit (14). The present short-circuit protection circuit, power adapter, and mobile terminal can be used for preventing the danger of an electrical shock when a power adaptor charges a mobile terminal.

Description

Short circuit protection circuit, power adapter and mobile terminal

Technical field

The present invention relates to the field of communications technologies, and in particular, to a short circuit protection circuit, a power adapter, and a mobile terminal.

Background technique

The application of mobile terminals such as smart phones is becoming more and more widespread, and people in modern life are basically a mobile phone. Currently, many mobile phones can be charged via a power adapter. At present, the outer casing of most mobile phones is a metal casing, and the metal casing is generally connected to the reference ground of the mobile phone. When the power adapter charges the mobile phone, the reference ground of the low voltage side inside the power adapter is connected with the reference ground of the mobile phone, that is, the inside of the power adapter is low. The voltage side is connected to the metal casing of the mobile phone, and there is a high potential difference between the reference ground of the low voltage side inside the power adapter and the earth. When the user stands on the ground and contacts the metal casing of the mobile phone, the earth voltage is transmitted to the charging through the human body. Low voltage reference ground. However, once there is a current between the low voltage reference ground inside the power adapter and the high voltage reference ground inside the power adapter, the current is conducted through the human body, causing an electric shock hazard.

Summary of the invention

The embodiment of the invention provides a short circuit protection circuit, a power adapter and a mobile terminal, which can prevent the risk of electric shock when the power adapter charges the mobile terminal.

A first aspect of the embodiment of the present invention discloses a short circuit protection circuit, which is applied to a power adapter, and the short circuit protection circuit includes a switching device, a control circuit, an acquisition circuit, a reference circuit, and a current transformer, wherein:

a first end of the switching device is connected to a high voltage reference ground of the power adapter, and a second end of the switching device is connected to a first end of a first capacitor of the power adapter through an input coil of the current transformer The second end of the first capacitor is connected to the low voltage reference ground of the power adapter or the low voltage positive pole, and the third end of the switching device is connected to the control end of the control circuit, and the first detecting end of the control circuit Connecting an output end of the acquisition circuit, a first input end of the acquisition circuit is connected to one end of an output coil of the current transformer, and a second input end of the acquisition circuit is connected to an output coil of the current transformer One end, the second detecting end of the control circuit is connected to the output end of the reference circuit;

The control circuit is configured to compare a current of an output coil of the current transformer collected by the acquisition circuit with an operating current of the reference circuit, and a current of an output coil of the current transformer is greater than a reference circuit A shutdown signal is output to the switching device when the current is applied to disconnect the switching device.

A second aspect of the embodiments of the present invention discloses a power adapter for charging a mobile terminal, where the power adapter includes a rectifier circuit, a high voltage circuit, a transformer, a low voltage circuit, and the first aspect of the embodiment of the present invention. Short circuit protection circuit, where:

The rectifier circuit is configured to convert the input alternating current into a direct current output to the high voltage circuit, and the high voltage circuit is configured to process the direct current output by the rectifier circuit and control an input high voltage of the transformer,

The transformer converts the input high voltage into an output low voltage output to the low voltage circuit for voltage stabilization processing and rectification processing, and outputs the result to the mobile terminal.

A third aspect of the embodiments of the present invention discloses a mobile terminal, including a charging chip, a battery, and a main board. When charging the mobile terminal by using a power adapter, the charging chip is configured to receive a voltage input by the power adapter and The battery is charged.

The short circuit protection circuit in the embodiment of the invention comprises a switching device, a control circuit, an acquisition circuit, a reference circuit and a current transformer. The control circuit is used for comparing the working current of the current transformer collected by the acquisition circuit with the working current of the reference circuit, and When the operating current of the current transformer is greater than the operating current of the reference circuit, the output is turned off to the switching device to disconnect the switching device. In order to prevent the risk of electric shock when the power adapter charges the mobile terminal, the embodiment of the invention provides a short circuit protection circuit inside the power adapter, the short circuit protection circuit is used for detecting the current of the output coil of the current transformer, when the current transformer is detected When the current of the output coil is greater than the preset current value, the high voltage reference ground is disconnected from the low voltage reference ground or the low voltage positive pole to avoid the risk of electric shock to the mobile terminal.

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 embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any creative work.

1 is a schematic structural diagram of a short circuit protection circuit according to an embodiment of the present invention;

2 is a schematic structural diagram of another short circuit protection circuit disclosed in an embodiment of the present invention;

3 is a schematic structural diagram of a power adapter according to an embodiment of the present invention;

4 is a schematic structural diagram of a mobile terminal according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of still another mobile terminal disclosed in the implementation of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The terms "first", "second" and the like in the specification and claims of the present invention and the above drawings are used to distinguish different objects, and are not intended to describe a specific order. Furthermore, the terms "comprises" and "comprising" and "comprising" are intended to cover a non-exclusive inclusion. For example, a process, system, product, or device that comprises a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units not listed, or alternatively also includes Other steps or units inherent to the process, product, or equipment.

References to "an embodiment" herein mean that a particular feature, structure, or characteristic described in connection with the embodiments can be included in at least one embodiment of the invention. The appearances of the phrases in various places in the specification are not necessarily referring to the same embodiments, and are not exclusive or alternative embodiments that are mutually exclusive. Those skilled in the art will understand and implicitly understand that the embodiments described herein can be combined with other embodiments.

The mobile terminal involved in the embodiments of the present invention may include various handheld devices having wireless communication functions, in-vehicle devices, wearable devices, computing devices, or other processing devices connected to the wireless modem, and various forms of user equipment (User Equipment, UE), mobile station (MS), terminal device, and the like. For convenience of description, the devices mentioned above are collectively referred to as mobile terminals.

The embodiments of the present invention are described in detail below.

Please refer to FIG. 1. FIG. 1 is a schematic structural diagram of a short circuit protection circuit according to an embodiment of the present invention. As shown in FIG. 1, the short circuit protection circuit 10 includes a switching device 11, a control circuit 12, an acquisition circuit 13, and a reference circuit 14. And a current transformer 15, wherein:

The first end 111 of the switching device 11 is connected to the high voltage reference ground of the power adapter, and the second end 112 of the switching device 11 is connected to the first end of the first capacitor C1 of the power adapter through the input coil 51 of the current transformer 15, first The second end of the capacitor C1 is connected to the low voltage reference ground of the power adapter or the low voltage positive pole. The third end 113 of the switching device 11 is connected to the control end 123 of the control circuit 12, and the first detecting end 121 of the control circuit 12 is connected to the output of the collecting circuit 13. The first input end 131 of the collecting circuit 13 is connected to one end of the output coil 52 of the current transformer 15, and the second input end 133 of the collecting circuit 13 is connected to the other end of the output coil 52 of the current transformer 15. The control circuit 12 is The second detecting end 122 is connected to the output end 141 of the reference circuit 14;

The control circuit 12 is configured to compare the current of the output coil 52 of the current transformer 15 collected by the acquisition circuit 13 with the operating current of the reference circuit 14, and output when the current of the output coil 52 of the current transformer 15 is greater than the operating current of the reference circuit 14. The signal is turned off to the switching device 11 to turn off the switching device 11.

Among them, the high-voltage reference ground refers to the neutral line of the mains connected to the power adapter. The low-voltage reference ground refers to the reference ground of the DC voltage that is output to the mobile terminal after passing through the transformer. The low voltage positive pole refers to the positive pole of the DC voltage that is output to the mobile terminal after passing through the transformer.

The current transformer 15 is used for current change, and can convert a large current (current of the input coil 51) into a small current (current of the output coil 52) according to a certain ratio, and is suitable for measuring an unknown large current scene, and the current transformer 15 is also Used for electrical isolation to protect other components in the power adapter from large currents.

The current of the output coil 52 of the current transformer 15 is the induced current generated by the output coil 52 measured by the current transformer 15 during operation. The operating current of the reference circuit 14 is the current of the reference circuit 14 during operation. The operating current of the reference circuit 14 can be set in advance. The operating current of the reference circuit 14 is used as a reference current, and once set, it is generally a fixed value.

The short circuit protection circuit 10 in the embodiment of the present invention is for detecting the current between the high voltage reference ground of the power adapter and the low voltage reference ground. Generally, a Y capacitor (ie, the first capacitor C1 in FIG. 1) is connected in series between the high voltage reference ground of the power adapter and the low voltage reference ground, and the Y capacitor is also called a safety capacitor for suppressing common mode interference. If there is a problem with the first capacitor C1, such as when the C1 is broken down, when the power adapter is used to charge the mobile terminal (such as a mobile phone), a short circuit occurs between the high voltage reference ground of the power adapter and the low voltage reference ground. There is a high current between the low voltage reference ground inside the power adapter and the high voltage reference ground inside the power adapter. Since the low voltage side inside the power adapter is connected to the metal case of the mobile terminal, the reference ground of the low voltage side inside the power adapter at this time There is a high potential difference between the ground and the earth. When the user stands on the ground and touches the metal casing of the mobile phone, the high current will be conducted through the human body, which may cause electric shock.

The embodiment of the present invention provides a short circuit protection circuit 10 between the high voltage reference ground of the power adapter and the low voltage reference ground for detecting the current between the low voltage reference ground inside the power adapter and the high voltage reference ground inside the power adapter ( That is, the operating current of the current transformer 15), when it is detected that the operating current of the current transformer 15 is greater than the operating current of the reference circuit 14, disconnect the high voltage reference ground from the low voltage reference ground or the low voltage positive electrode to avoid electric shock from the mobile terminal. Danger. When using the power adapter to charge the mobile terminal, when detecting a large current inside the power adapter, disconnect the power supply in time to avoid the risk of electric shock and protect the user's personal safety.

The current transformer 15 is used for current change, and can convert a large current into a small current according to a certain ratio, and is suitable for measuring an unknown high current scene. The current transformer 15 is also used for electrical isolation, and can protect other components in the power adapter. Not damaged by large currents.

The operating current of the current transformer 15 is the induced current measured during the operation of the current transformer 15. The operating current of the reference circuit 14 is the current of the reference circuit 14 during operation. The operating current of the reference circuit 14 can be set in advance. The operating current of the reference circuit 14 is used as a reference current, and once set, it is generally a fixed value. As shown in FIG. 2, FIG. 2 is a schematic structural diagram of another short circuit protection circuit according to an embodiment of the present invention. As shown in FIG. 2, the short circuit protection circuit 10 includes a switching device 11, a control circuit 12, an acquisition circuit 13, and a reference. Circuit 14 and current transformer 15.

The first end 111 of the switching device 11 is connected to the high voltage reference ground of the power adapter, and the second end 112 of the switching device 11 is connected to the first end of the first capacitor C1 of the power adapter through the input coil 51 of the current transformer 15, the first capacitor The second end of the C1 is connected to the low voltage reference ground of the power adapter or the low voltage positive pole. The third end 113 of the switching device 11 is connected to the control end 123 of the control circuit 12. The first detecting end 121 of the control circuit 12 is connected to the output end of the collecting circuit 13. 132, the first input end 131 of the acquisition circuit 13 is connected to one end of the output coil 52 of the current transformer 15, and the second input end 133 of the acquisition circuit 13 is connected to the other end of the output coil 52 of the current transformer 15, the control circuit 12 The second detecting end 122 is connected to the output end 141 of the reference circuit 14;

The control circuit 12 includes a voltage comparator U1. The non-inverting input terminal of the voltage comparator U1 is connected to the output terminal 132 of the acquisition circuit 13. The inverting input terminal of the voltage comparator U1 is connected to the output terminal 141 of the reference circuit 14, and the voltage comparator U1. The output terminal 123 is connected to the third end 113 of the switching device 11.

The power supply terminal of the voltage comparator U1 is VDD, and the ground terminal of the voltage comparator U1 is connected to the ground terminal of the output coil 52 of the current transformer 15.

Optionally, as shown in FIG. 2, the switching device 11 includes a MOS transistor. The gate of the MOS transistor is connected to the output end of the voltage comparator. The first end of the MOS transistor is connected to the high voltage reference ground of the power adapter, and the second end of the MOS transistor. One end of the input coil 51 of the current transformer 15 is connected, and the other end of the input coil 51 is connected to the first end of the first capacitor C1.

Optionally, as shown in FIG. 2, the MOS transistor is a PMOS transistor.

Optionally, as shown in FIG. 2, the collecting circuit 13 includes a sampling resistor R1. The first end 132 of the sampling resistor R1 is connected to one end of the output coil 52 of the current transformer 15. The second end 131 of the sampling resistor R1 is connected to the voltage comparator. The non-inverting input of U1 and the other end of output coil 52 of current transformer 15. The output coil 52 of the current transformer 15 and the sampling resistor R1 form a closed loop. The magnitude of the sampling resistor R1 can be set. For example, under normal conditions, the switching device 11 is in an on state, the induced current of the output coil 52 measured by the current transformer 15 is generally less than 0.5 mA, and the voltage of the reference circuit 14 is 1 V. , you can set the resistance R1 to 2000Ω. When the induced current of the output coil 52 of the current transformer 15 is greater than 0.5 mA, the voltage comparator U1 controls the switching device 11 to be turned off to prevent an electric shock.

When the low voltage reference ground inside the power adapter is short-circuited with the high voltage reference ground inside the power adapter, the voltage across the sampling resistor R1 is much larger than the voltage of the reference circuit 14, and the voltage comparator U1 outputs a high level. To the switching device (PMOS transistor) 11, so that the switching device 11 is turned off (ie, the PMOS transistor is turned off), the connection between the power adapter and the mobile terminal can be disconnected to prevent electric shock.

2 is only an example in which the control circuit 12 includes a voltage comparator. In other embodiments, the control circuit may also include a current comparator for comparing the current on the sampling resistor R1 with the reference circuit 14 (eg, The current level of the reference current source).

In a possible implementation manner, the MOS transistor can also be an NMOS transistor. At this time, the connection relationship is as follows: the control circuit 12 includes a voltage comparator U1, the inverting input terminal 121 of the voltage comparator U1 is connected to the output terminal 132 of the acquisition circuit 13, and the non-inverting input terminal 122 of the voltage comparator U1 is connected to the reference circuit 14. At the output terminal 141, the output terminal 123 of the voltage comparator U1 is connected to the third terminal 113 of the switching device 11. The switching device 11 includes a MOS transistor. The gate of the MOS transistor is connected to the output terminal 123 of the voltage comparator. The first end of the MOS transistor is connected to the high voltage reference ground of the power adapter, and the second end of the MOS transistor is connected to the input terminal of the current transformer.

Alternatively, as shown in FIG. 2, the current transformer 15 includes a core 53, and the input coil 51 and the output coil 52 are wound around the iron core 53, respectively.

The number of turns of the input coil 51 is smaller than the number of turns of the output coil 52.

Among them, when a current is generated in the input coil 51, the output coil 52 generates an induced current.

The current of the input coil 51 is smaller than the induced current of the output coil 52.

The current transformer 15 is used to isolate the high voltage reference ground from the low voltage reference ground or the low voltage positive pole.

Optionally, as shown in FIG. 2, the reference circuit 14 includes a reference voltage source. Of course, in other possible implementations, the reference circuit 14 can include a reference current source and a reference resistor.

The voltage comparator U1 is configured to compare the voltage of R1 across the sampling resistor with the voltage of the reference voltage source, and output a shutdown signal to the switching device 11 when the voltage across the sampling resistor R1 is greater than the voltage of the reference voltage source, so that the switch Device 11 is disconnected.

In the short circuit protection circuit 10 shown in FIG. 2, when the acquisition circuit 13 detects that the operating current of the current transformer 15 exceeds a certain value, the voltage input by the non-inverting input terminal 122 of the voltage comparator U1 is greater than the input of the inverting input terminal 121. The output terminal 123 of the voltage and voltage comparator U1 outputs a high level to the gate of the PMOS transistor 113 to turn off the PMOS transistor, disconnecting the high voltage reference ground from the low voltage reference ground or the low voltage positive electrode, thereby preventing the electric shock. .

Please refer to FIG. 3. FIG. 3 is a schematic structural diagram of a power adapter according to an embodiment of the present invention. As shown in FIG. 3, the power adapter 100 is used to charge the mobile terminal 200. The power adapter 100 includes a rectifier circuit 20 and a high voltage circuit 30. The transformer 40, the low voltage circuit 50, and the short circuit protection circuit 10 shown in FIG. 2, wherein:

The rectifier circuit 20 is for converting the input alternating current into a direct current output to the high voltage circuit 30, and the high voltage circuit 30 is for processing the direct current output from the rectifier circuit 20 and controlling the input high voltage of the transformer 40.

The transformer 40 converts the input high voltage into an output low voltage output to the low voltage circuit 50 for voltage stabilization processing and rectification processing, and outputs it to the mobile terminal 200.

The short circuit protection circuit 10 is configured to detect whether the power adapter 100 is short-circuited, and when the circuit adapter 100 is short-circuited, the short circuit in the power adapter 100 is controlled to be disconnected. The short circuit in the power adapter 100 can include a short circuit between the high voltage reference ground and the low voltage reference ground or the low voltage positive pole.

The high voltage circuit 30 includes an inductor filter, a second capacitor, a power chip, and a switch tube. The high voltage circuit is used to control the input of the transformer 40 to be a high voltage.

The transformer 40 is for converting a voltage from a high voltage to a multi-winding device of a low voltage output while supplying power to the short circuit protection circuit 10.

The low voltage circuit 50 may include a rectifying and filtering circuit, and the rectifying and filtering circuit may include a capacitor, a rectifying device, and the like.

In the embodiment of the present invention, when the power adapter 100 is used to charge the mobile terminal 200, when the short circuit protection circuit 10 detects the short circuit phenomenon, the short circuit protection circuit 10 is turned off, and the power adapter 100 stops supplying power to the mobile terminal 200 to prevent electric shock. effect.

Referring to FIG. 4, FIG. 4 is a schematic structural diagram of a mobile terminal according to an embodiment of the present invention. As shown in FIG. 4, the mobile terminal 200 includes a charging chip 21, a battery 22, and a main board 23, and is moved when the power adapter 100 is used. When the terminal 200 is charged, the charging chip 21 is for receiving the voltage input by the power adapter 100 and charging the battery 22.

The power adapter 100 includes the rectifier circuit 20, the high voltage circuit 30, the transformer 40, the low voltage circuit 50, and the short circuit protection circuit 10 shown in FIG.

In the embodiment of the present invention, when the power adapter 100 is used to charge the mobile terminal 200, when the power adapter 100 detects the short circuit phenomenon, the power adapter 100 is disconnected from the mobile terminal 200, and the power adapter 100 stops supplying power to the mobile terminal 200. Prevent the effects of electric shock.

Another embodiment of the present invention provides another mobile terminal. As shown in FIG. 5, FIG. 5 is a schematic structural diagram of still another mobile terminal disclosed in the implementation of the present invention. For the convenience of description, only parts related to the embodiment of the present invention are shown. The mobile terminal can be any terminal device including a mobile phone, a tablet computer, a PDA (Personal Digital Assistant), a POS (Point of Sales), an in-vehicle computer, and the mobile terminal is used as a mobile phone as an example:

FIG. 5 is a block diagram showing a partial structure of a mobile phone related to a mobile terminal provided by an embodiment of the present invention. Referring to FIG. 5, the mobile phone includes: a radio frequency (RF) circuit 910, a memory 920, an input unit 930, a display unit 940, a sensor 950, an audio circuit 960, a wireless fidelity (WiFi) module 970, and a processor 980. And power supply 990 and other components. It will be understood by those skilled in the art that the structure of the handset shown in FIG. 5 does not constitute a limitation to the handset, and may include more or less components than those illustrated, or some components may be combined, or different components may be arranged.

The following describes the components of the mobile phone in detail with reference to FIG. 5:

The RF circuit 910 can be used for receiving and transmitting information. Generally, RF circuit 910 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a Low Noise Amplifier (LNA), a duplexer, and the like. In addition, RF circuitry 910 can also communicate with the network and other devices via wireless communication. The above wireless communication may use any communication standard or protocol, including but not limited to Global System of Mobile communication (GSM), General Packet Radio Service (GPRS), Code Division Multiple Access (Code Division). Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA), Long Term Evolution (LTE), E-mail, Short Messaging Service (SMS), and the like.

The memory 920 can be used to store software programs and modules, and the processor 980 executes various functional applications and data processing of the mobile phone by running software programs and modules stored in the memory 920. The memory 920 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application required for at least one function, and the like; the storage data area may store data created according to usage of the mobile phone, and the like. Moreover, memory 920 can include high speed random access memory, and can also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device.

The input unit 930 can be configured to receive input numeric or character information and to generate key signal inputs related to user settings and function controls of the handset. Specifically, the input unit 930 can include a fingerprint identification module 931 and other input devices 932. The fingerprint identification module 931 can collect fingerprint data of the user. In addition to the fingerprint recognition module 931, the input unit 930 may also include other input devices 932. Specifically, other input devices 932 may include, but are not limited to, one or more of a touch screen, a physical keyboard, function keys (such as volume control buttons, switch buttons, etc.), trackballs, mice, joysticks, and the like.

The display unit 940 can be used to display information input by the user or information provided to the user as well as various menus of the mobile phone. The display unit 940 can include a display screen 941. Alternatively, the display screen 941 can be configured in the form of a liquid crystal display (LCD), an organic light-emitting diode (OLED), or the like. Although in FIG. 5, the fingerprint recognition module 931 and the display screen 941 are used as two separate components to implement the input and input functions of the mobile phone, in some embodiments, the fingerprint recognition module 931 and the display screen 941 may be Integrated to achieve the input and playback functions of the phone.

The handset may also include at least one type of sensor 950, such as a light sensor, motion sensor, and other sensors. Specifically, the light sensor may include an ambient light sensor and a proximity sensor, wherein the ambient light sensor may adjust the brightness of the display screen 941 according to the brightness of the ambient light, and the proximity sensor may turn off the display screen 941 and/or when the mobile phone moves to the ear. Or backlight. As a kind of motion sensor, the accelerometer sensor can detect the magnitude of acceleration in all directions (usually three axes). When it is stationary, it can detect the magnitude and direction of gravity. It can be used to identify the gesture of the mobile phone (such as horizontal and vertical screen switching, related Game, magnetometer attitude calibration), vibration recognition related functions (such as pedometer, tapping), etc.; as for the mobile phone can also be configured with gyroscopes, barometers, hygrometers, thermometers, infrared sensors and other sensors, no longer Narration.

An audio circuit 960, a speaker 961, and a microphone 962 can provide an audio interface between the user and the handset. The audio circuit 960 can transmit the converted electrical data of the received audio data to the speaker 961 for conversion to the sound signal by the speaker 961; on the other hand, the microphone 962 converts the collected sound signal into an electrical signal by the audio circuit 960. After receiving, it is converted into audio data, and then processed by the audio data playback processor 980, sent to the other mobile phone via the RF circuit 910, or played back to the memory 920 for further processing.

WiFi is a short-range wireless transmission technology, and the mobile phone can help users to send and receive emails, browse web pages, and access streaming media through the WiFi module 970, which provides users with wireless broadband Internet access. Although FIG. 5 shows the WiFi module 970, it can be understood that it does not belong to the essential configuration of the mobile phone, and may be omitted as needed within the scope of not changing the essence of the invention.

The processor 980 is the control center of the handset, which connects various portions of the entire handset using various interfaces and lines, by executing or executing software programs and/or modules stored in the memory 920, and invoking data stored in the memory 920, executing The phone's various functions and processing data, so that the overall monitoring of the phone. Optionally, the processor 980 may include one or more processing units; preferably, the processor 980 may integrate an application processor and a modem processor, where the application processor mainly processes an operating system, a user interface, an application, and the like. The modem processor primarily handles wireless communications. It will be appreciated that the above described modem processor may also not be integrated into the processor 980.

The handset also includes a power source 990 (such as a battery) that supplies power to the various components. Preferably, the power source can be logically coupled to the processor 980 through a power management system to manage functions such as charging, discharging, and power management through the power management system.

Although not shown, the mobile phone may further include a camera, a Bluetooth module, and the like, and details are not described herein again.

In the above embodiments, the descriptions of the various embodiments are different, and the details that are not detailed in a certain embodiment can be referred to the related descriptions of other embodiments.

In the several embodiments provided herein, it should be understood that the disclosed apparatus may be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or may be Integrate into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be electrical or otherwise.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

The embodiments of the present invention have been described in detail above, and the principles and implementations of the present invention are described in detail herein. The description of the above embodiments is only for helping to understand the core idea of the present invention. The present invention is not limited by the scope of the present invention.

Claims

A short circuit protection circuit is applied to a power adapter, characterized in that the short circuit protection circuit comprises a switching device, a control circuit, an acquisition circuit, a reference circuit and a current transformer, wherein:

a first end of the switching device is connected to a high voltage reference ground of the power adapter, and a second end of the switching device is connected to a first end of the first capacitor of the power adapter through an input coil of the current transformer. The second end of the first capacitor is connected to the low voltage reference ground of the power adapter or the low voltage positive pole, and the third end of the switching device is connected to the control end of the control circuit, and the first detecting end of the control circuit is connected An output end of the acquisition circuit, a first input end of the acquisition circuit is connected to one end of an output coil of the current transformer, and a second input end of the acquisition circuit is connected to another end of an output coil of the current transformer The second detecting end of the control circuit is connected to the output end of the reference circuit;

The control circuit is configured to compare a current of an output coil of the current transformer collected by the acquisition circuit with an operating current of the reference circuit, and a current of an output coil of the current transformer is greater than a reference circuit A shutdown signal is output to the switching device when the current is applied to disconnect the switching device.
A short circuit protection circuit according to claim 1, wherein said control circuit comprises a voltage comparator, said non-inverting input of said voltage comparator being connected to an output of said acquisition circuit, said voltage comparator being inverted An input is coupled to an output of the reference circuit, and an output of the voltage comparator is coupled to a third end of the switching device.
The short circuit protection circuit according to claim 2, wherein the switching device comprises a MOS transistor, a gate of the MOS transistor is connected to an output end of the voltage comparator, and a first end of the MOS transistor is connected The high voltage reference ground of the power adapter, the second end of the MOS tube is connected to one end of the input coil of the current transformer, and the other end of the input coil is connected to the first end of the first capacitor.
The short circuit protection circuit according to claim 3, wherein said MOS transistor is a PMOS transistor.
The short circuit protection circuit according to claim 3, wherein the MOS transistor is an NMOS transistor.
The short circuit protection circuit according to any one of claims 2 to 5, wherein the current transformer further comprises a core, and the input coil and the output coil are respectively wound around the iron core.
The short circuit protection circuit according to claim 6, wherein the number of turns of the input coil is smaller than the number of turns of the output coil.
The short circuit protection circuit according to claim 6 or 7, wherein the output coil generates an induced current when a current is generated in the input coil.
The short circuit protection circuit according to claim 8, wherein the current of the input coil is smaller than the induced current of the output coil.
The short circuit protection circuit according to any one of claims 6 to 9, wherein the current transformer is for isolating the high voltage reference ground from the low voltage reference ground or the low voltage positive electrode.
The short circuit protection circuit according to any one of claims 6-9, wherein the acquisition circuit comprises a sampling resistor, and the first end of the sampling resistor is connected to one end of an output coil of the current transformer, and the sampling resistor is The second end is coupled to the non-inverting input of the voltage comparator and the other end of the output coil of the current transformer.
A short circuit protection circuit according to any one of claims 2-11, wherein the reference circuit comprises a reference voltage source.
The short circuit protection circuit according to claim 12, wherein said voltage comparator is configured to compare a voltage across said sampling resistor with a voltage of said reference voltage source, and a voltage across said sampling resistor is greater than said voltage The voltage of the reference voltage source outputs a turn-off signal to the switching device to turn the switching device off.
A short circuit protection circuit according to any one of claims 2 to 12, wherein the reference circuit comprises a reference current source and a reference resistor.
A power adapter, characterized in that the power adapter is for charging a mobile terminal, the power adapter comprising a rectifier circuit, a high voltage circuit, a transformer, a low voltage circuit, and the short circuit protection according to any one of claims 1-14 Circuit, where:

The rectifier circuit is configured to convert the input alternating current into a direct current output to the high voltage circuit, and the high voltage circuit is configured to process the direct current output by the rectifier circuit and control an input high voltage of the transformer,

The transformer converts the input high voltage into an output low voltage output to the low voltage circuit for voltage stabilization processing and rectification processing, and outputs the result to the mobile terminal.
The power adapter according to claim 15, wherein said short circuit protection circuit is configured to detect whether said power adapter is short-circuited, and to control a short circuit in said power adapter when said circuit adapter is short-circuited open.
The power adapter of claim 15 wherein said high voltage circuit comprises an inductive filter, a second capacitor, a power chip, and a switching transistor, said high voltage circuit for controlling the input of said transformer to be a high voltage.
The power adapter of claim 15 wherein said low voltage circuit comprises a rectifying filter circuit.
A mobile terminal, comprising: a charging chip, a battery, and a main board, wherein when charging the mobile terminal with a power adapter, the charging chip is configured to receive a voltage input by the power adapter and charge the battery.
The mobile terminal of claim 19, wherein the power adapter comprises a rectifier circuit, a high voltage circuit, a transformer, a low voltage circuit, and the short circuit protection circuit according to any one of claims 1-14.