WO2023010506A1

WO2023010506A1 - Charging circuit and electronic device

Info

Publication number: WO2023010506A1
Application number: PCT/CN2021/111114
Authority: WO
Inventors: 雷云; 张智锋; 欧阳明星
Original assignee: 深圳市华思旭科技有限公司
Priority date: 2021-08-06
Filing date: 2021-08-06
Publication date: 2023-02-09
Also published as: CN116349109A

Abstract

Provided in the present application are a charging circuit and an electronic device. The charging circuit comprises a charging interface, a control module and a protocol identification circuit. The charging interface is used for being connected to a charger. The control module is used for outputting a control signal according to a preset output mode in response to the charging interface being connected to the charger. The protocol identification circuit is used for receiving the control signal and outputting an induction signal according to the control signal, wherein the induction signal can be transmitted to the charger by means of the charging interface, so as to induce the charger to transmit a charging voltage to the charging interface according to a target charging protocol. By means of the charging circuit provided in the present application, a simple protocol identification circuit is used to replace a protocol IC chip, such that a corresponding charging voltage can be induced from a charger according to a target charging protocol; and the charging circuit has a simple structure, a low cost and a wide application range.

Description

Charging Circuits and Electronics

technical field

The present application relates to the technical field of charging, in particular to a charging circuit and electronic equipment.

Background technique

QC fast charging technology, that is, QuickCharge technology, is a fast charging technology led by Qualcomm. It mainly solves the problem of fast charging of batteries under different hardware environments. Taking Qualcomm QC2.0 as an example, to further increase the charging speed without changing the interface, it is necessary to introduce a higher charging voltage. Qualcomm has designed a handshake protocol for the USB interface to realize mutual recognition between the charger and the electronic device by changing the voltage of the D+ and D- pins of the USB interface. The charger outputs the voltage through the D+ and D- pins of the electronic device according to the voltage The signal outputs the corresponding voltage (such as 5V, 9V, 12V or 20V) to quickly charge the electronic device.

At present, electronic devices supporting QC fast charging technology on the market usually use a protocol IC chip (Integrated Circuit Chip) to perform QC protocol communication with the charger. However, the price of the protocol IC is relatively high.

Contents of the invention

A first aspect of the present application provides a charging circuit, which includes a charging interface, a control module, and a protocol identification circuit. Wherein, the charging interface is used for connecting with a charger. The control module is configured to output a control signal according to a preset output mode in response to the charging interface being connected to the charger. The protocol identification circuit is used to receive the control signal, and output an induction signal according to the control signal, the induction signal can be transmitted to the charger through the charging interface, so as to induce the charger to follow the target charging protocol A charging voltage is delivered to the charging interface.

The second aspect of the present application provides an electronic device, which includes an energy storage component and the charging circuit described in the first aspect above, the energy storage component is connected to the charging circuit, and the charging circuit is used for receiving an external power source and charging the energy storage component.

The charging circuit provided by this application adopts a simple protocol identification circuit instead of a protocol IC chip, and can induce a corresponding charging voltage from a charger according to a target charging protocol. It has a simple structure, low cost, and a wide range of applications.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some implementations of the present application. For those skilled in the art, other drawings can also be obtained according to these drawings without creative work.

FIG. 1 is a schematic diagram of functional modules of a charging circuit provided by an embodiment of the present application.

Fig. 2 is a schematic diagram of functional modules of another charging circuit provided by an embodiment of the present application.

FIG. 3 is a schematic diagram of the circuit structure of the charging interface and the charging control module of the charging circuit shown in FIG. 2 .

FIG. 4 is a schematic circuit structure diagram of a voltage detection module of the charging circuit shown in FIG. 2 .

FIG. 5 is a schematic diagram of a circuit structure of a protocol identification circuit of the charging circuit shown in FIG. 2 .

FIG. 6 is a schematic circuit structure diagram of another protocol identification circuit of the charging circuit shown in FIG. 2 .

FIG. 7 is a schematic circuit structure diagram of a control module of the charging circuit shown in FIG. 2 .

Fig. 8 is a schematic diagram of functional modules of an electronic device provided by an embodiment of the present application.

Description of main component symbols

Charging circuit 100, 100'

Charger 200

Energy storage components 300

Charging interface 10

Voltage detection module 20

Protocol identification circuit 30, 30'

Control Module 40

Charging control circuit 50

Voltage regulator module 60

Electronic equipment 600

The first signal output terminal D+

The second signal output terminal D-

Voltage input terminal 305

Voltage divider circuit

306, 307

Voltage divider node 301, 302

The first input terminal 311

The second input terminal 312

The third input terminal 313

Fourth input terminal 314

Fifth input terminal 315

Resistors R1, R2, R7, R12, R14, R15, R16, R17, R18,

R19, R21, R22

One-way conduction element D2, D4

Switch unit Q2, Q3, Q5, Q22

Ground point GND, SGND

Microcontroller U2

USB interface J1

The following specific embodiments will further illustrate the present application in conjunction with the above-mentioned drawings.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Wherein, the accompanying drawings are used for illustrative purposes only, represent only schematic diagrams, and should not be construed as limitations on the present application. Apparently, the described implementations are only some, not all, embodiments of the present application. Based on the implementation manners in this application, all other implementation manners obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

Unless defined otherwise, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in the description of the present application is only for the purpose of describing specific implementations, and is not intended to limit the present application.

Please refer to FIG. 1 , the embodiment of the present application provides a charging circuit 100 , the charging circuit 100 includes a charging interface 10 , a control module 40 and a protocol identification circuit 30 .

In the embodiment of the present application, the charging interface 10 is used to connect with the charger 200 . Wherein, the charging interface 10 may include a USB interface.

It should be noted that the "connection" in this application includes the form of physical line connection and/or wireless connection between components to realize the transmission of electric energy.

In the embodiment of the present application, the control module 40 is configured to output a control signal according to a preset output mode in response to the charging interface 10 being connected to the charger 200 . In this embodiment of the present application, the preset output mode includes a voltage value of at least one control signal and an output duration of the at least one control signal.

In the embodiment of the present application, the protocol identification circuit 30 is configured to receive the control signal, and output an induction signal according to the control signal, and the induction signal can be transmitted to the charger 200 through the charging interface 10, To induce the charger 200 to deliver the charging voltage to the charging interface 10 according to the target charging protocol.

In the embodiment of the present application, the protocol identification circuit 30 is connected to the charging interface 10 and the control module 40 respectively. The protocol identification circuit 30 includes a semiconductor element and/or a resistor, wherein the semiconductor element includes a transistor and/or a unidirectional conduction element.

Exemplarily, the control signals include a first group of control signals and a second group of control signals, and the induction signals include a first group of induction signals and a second group of induction signals. The outputting the control signal according to a preset output mode specifically includes: continuously outputting the first group of control signals. When the continuous output time of the first group of control signals is greater than the preset time threshold, the output of the first group of control signals is stopped, and the second group of control signals is continuously output.

The protocol identification circuit 30 outputs the first group of induction signals according to the first group of control signals, and the protocol identification circuit 30 outputs the second group of induction signals according to the second group of control signals, wherein the The first group of induction signals and the second group of induction signals are used to induce the charger 200 to deliver a charging voltage to the charging interface 10 according to a target charging protocol. Exemplarily, the target charging protocol includes Qualcomm QC2.0 protocol, and the induction signal can induce the charger 200 to output a charging voltage of 5V, 9V or 12V.

The charging circuit 100 provided in this application uses a simple protocol identification circuit 30 instead of a protocol IC chip, and can induce a corresponding charging voltage from a charger according to a target charging protocol. The structure is simple, the cost is low, and the application range is wide.

Please refer to FIG. 2 , the embodiment of the present application provides another charging circuit 100 ′. As shown in FIG. 2 , in the embodiment of the present application, the charging circuit 100 ′ further includes a voltage detection module 20 connected to the control module 40 and the charging interface 10 respectively, and the voltage detection module 20 is used to detect The input voltage of the charging interface 10 is used to determine that the charging interface 10 is connected to the charger 200 according to the input voltage, and to output a trigger signal to the control module 40 . The control module 40 is configured to output the control signal in response to the trigger signal, so that the protocol identification circuit 30 outputs the induction signal according to the control signal.

For example, please refer to FIGS. 3-4 together. The charging interface 10 includes a USB interface J1, and the USB interface J1 includes a first voltage pin V+, a second voltage pin V-, and a first signal pin ( D+ pin) and a second signal pin (D- pin). The voltage detection module 20 includes a resistor R14, a resistor R16 and a switch unit Q22. Wherein, one end of the resistor R14 is connected to the first voltage pin V+ for receiving the input voltage VIN of the USB interface J1, and the other end of the resistor R14 is connected to the control end of the switch unit Q22. One end of the resistor R16 is connected to the control end of the switch unit Q22, and the other end of the resistor R16 is connected to the ground point SGND. A first connection end of the switch unit Q22 is connected to the control module 40, and a second connection end of the switch unit Q22 is connected to the ground point SGND. During operation, when the charger 200 is connected to the USB interface J1, the charger 200 outputs a voltage VIN to the first voltage pin V+ of the USB interface J1, for example, the voltage value of the voltage VIN is 5V, so The voltage VIN turns on the switch unit Q22 , so that the voltage detection module 20 outputs the trigger signal VIN_INT to the control module 40 . In the embodiment of the present application, the trigger signal VIN_INT is a low level signal.

In the embodiment of the present application, the charging circuit 100 ′ further includes a charging control circuit 50 connected to the USB interface J1 , and the charging control circuit 50 is used for connecting the energy storage component 300 . When charging, the charger 200 charges the energy storage component 300 through the USB interface J1 and the charging control circuit 50 . The charging control circuit 50 feeds back the charging current signal CHA_I_SCAN to the control module 40 in real time, and the control module 40 is also used to adjust the duty of the PWM signal output to the charging control circuit 50 according to the charging current signal CHA_I_SCAN ratio, so that the charger 200 can charge the energy storage component 300 with a constant current, for example, 2A constant current charging with a charging power of 18W. Exemplarily, the energy storage component 300 may include, but not limited to, lithium batteries and supercapacitors.

In some embodiments, the protocol identification circuit 30 includes one or more control signal input terminals, and one or more signal output terminals, wherein the voltage value of the control signal received by one of the control signal input terminals affects at least A voltage value of the induction signal output by the signal output terminal.

In some embodiments, the protocol identification circuit 30 includes two identification sub-modules, each identification sub-module is connected to at least one of the control signal input terminals and one of the signal output terminals, and each identification sub-module is used to The voltage value of the control signal received by the control signal input terminal connected thereto outputs an induction signal of a corresponding voltage value at the signal output terminal connected thereto.

Referring to FIG. 5 , the embodiment of the present application provides a circuit structure of a protocol identification circuit 30 . As shown in Figure 5, in the embodiment of the present application, the signal output terminal includes a first signal output terminal D+ and a second signal output terminal D-, wherein the first signal output terminal D+ is connected to the USB interface J1 The D+ pin of the second signal output terminal D- is connected to the D- pin of the USB interface J1. The protocol identification circuit 30 includes a first identification submodule 31 and a second identification submodule 32, and the control signal input terminals of the protocol identification circuit 30 include a first input terminal 311, a second input terminal 312 and a third input terminal 313 . Specifically, the first identification submodule 31 is connected to the first input terminal 311 and the first signal output terminal D+, and the second identification submodule 32 is connected to the second input terminal 312, the third The input terminal 313 and the second signal output terminal D−.

In this embodiment, each group of control signals includes a first control signal QC_EN1 , a second control signal QC_EN2 and a third control signal QC_EN3 .

Specifically, the protocol identification circuit 30 further includes a voltage input terminal 305, a first voltage divider circuit 306, a second voltage divider circuit 307, a first switch unit Q3, a second switch unit Q2 and a third switch unit Q5.

Wherein, the voltage input terminal 305 is connected to a voltage source for receiving a stable voltage VCC. The first voltage dividing circuit 306 is connected between the voltage input terminal 305 and the ground point GND, and the first voltage dividing circuit 306 includes a first voltage dividing node 301 connected to the first signal output terminal D+. The first connection terminal of the first switch unit Q3 is connected to the first signal output terminal D+ through a resistor R18, the second connection terminal of the first switch unit Q3 is connected to the ground point GND, and the first A control terminal of the switch unit Q3 is connected to the first input terminal 311 and used for receiving the first control signal QC_EN1. Wherein, the first voltage divider circuit 306 includes a resistor R2 and a resistor R7, the resistor R2 is connected between the voltage input terminal 305 and the first signal output terminal D+, and the resistor R7 is connected to the first signal output terminal D+. Between a signal output terminal D+ and the ground point GND.

The second voltage dividing circuit 307 is connected between the voltage input terminal 305 and the ground point GND, and the second voltage dividing circuit 307 includes a second voltage dividing circuit connected to the second signal output terminal D- Node 302.

The second switch unit Q2 is connected between the voltage input terminal 305 and the second voltage divider circuit 307, the control terminal of the second switch unit Q2 is connected to the second input terminal 312, and is used for receiving the second control signal QC_EN2. The control terminal of the second switch unit Q2 is also connected to the voltage input terminal 305 through a resistor R1.

The third switch unit Q5 is connected between the second voltage divider circuit 307 and the ground point GND, the control terminal of the third switch unit Q5 is connected to the third input terminal 313, and is used to receive the The third control signal QC_EN3 is described above. Wherein, the second voltage dividing circuit 307 includes a resistor R12 and a resistor R19, the resistor R12 is connected between the second switch unit Q2 and the second signal output terminal D-, and the resistor R19 is connected to the first Between the second signal output terminal D- and the third switch unit Q5.

In the embodiment of the present application, the first switch unit Q3 and the third switch unit Q5 adopt a high-level conduction switch unit, and the second switch unit Q2 adopts a low-level conduction switch unit. Exemplarily, the switch unit includes a transistor.

During operation, the first control signal QC_EN1 and the second control signal QC_EN2 in the first group of control signals are both high-level signals, and the third control signal QC_EN3 is a low-level signal. When the protocol identification circuit 30 receives the first group of control signals, the first switch unit Q3 is turned on, and the first signal output terminal D+ outputs a first signal whose voltage value is within the first threshold value range , the second switch unit Q2 and the third switch unit Q5 are both disconnected, and the second signal output terminal D- is suspended, wherein the first group of inducing signals is that the voltage value is within the first threshold The first signal in the range of values. In this embodiment of the present application, when the continuous output time of the first group of control signals is greater than 1.25s, the output of the first group of control signals is stopped, and the second group of control signals is continuously output, and the first threshold The value range is 0.325V-2.0V.

The first control signal QC_EN1 and the second control signal QC_EN2 in the second group of control signals are both low-level signals, and the third control signal QC_EN3 is a high-level signal. When the protocol identification circuit 30 receives the second group of control signals, the first switch unit Q3 is turned off, and the first signal output terminal D+ outputs a first signal whose voltage value is within the second threshold value range , the second switch unit Q2 and the third switch unit Q5 are both turned on, and the second signal output terminal D- outputs a second signal whose voltage value is within the range of the first threshold value, wherein the The second group of induced signals is composed of the first signal whose voltage value is within the second threshold value range and the second signal whose voltage value is within the first threshold value range. In the embodiment of the present application, the second threshold value ranges from 2.0V to 5.0V, and after the protocol identification circuit 30 outputs the first set of induction signals to the charger 200 for a duration exceeding 1.25s, Then outputting the second group of induction signals can induce the charger 200 to output a charging voltage of 9V according to the QC protocol.

Referring to FIG. 6 , the embodiment of the present application also provides another circuit structure of the protocol identification circuit 30 ′. As shown in FIG. 6 , the control signal input terminals of the protocol identification circuit 30 ′ include a fourth input terminal 314 and a fifth input terminal 315 .

In this embodiment, each set of control signals includes a fourth control signal QC_EN4 and a fifth control signal QC_EN5 . The fourth input terminal 314 is used for receiving the fourth control signal QC_EN4 , and the fifth input terminal 315 is used for receiving the fifth control signal QC_EN5 .

Specifically, the protocol identification circuit 30' further includes a resistor R15, a resistor R17, a resistor R21, a resistor R22, a unidirectional conduction element D2, and a unidirectional conduction element D4. The resistor R15 is connected between the fifth input terminal 315 and the first signal output terminal D+. The resistor R17 is connected between the first signal output terminal D+ and the first ground point GND. The anode of the unidirectional conduction element D4 is connected to the fourth input terminal 314 , and the cathode of the unidirectional conduction element D4 is connected to the first signal output terminal D+. The resistor R21 is connected in parallel with the first unidirectional conduction element D4 between the fourth input terminal 314 and the first signal output terminal D+. The anode of the unidirectional conduction element D2 is connected to the second signal output terminal D−, and the cathode of the unidirectional conduction element D2 is connected to the ground point GND. The resistor R22 is connected between the second signal output terminal D− and the fourth input terminal 314 . Preferably, the unidirectional conduction element includes a diode.

During operation, the fourth control signal QC_EN4 in the first group of control signals is a low-level signal, the fifth control signal QC_EN5 is a high-level signal, and the protocol identification circuit 30' receives the first group of control signals , the first signal output terminal D+ outputs a first signal whose voltage value is within the first threshold range, the second signal output terminal D- outputs a second signal whose voltage value is less than the voltage threshold, and the first The group induction signal is composed of the first signal whose voltage value is within the first threshold value range and the second signal whose voltage value is less than the voltage threshold value. In this embodiment of the present application, when the continuous output time of the first group of control signals is greater than 1.25s, the output of the first group of control signals is stopped, and the second group of control signals is continuously output, and the first threshold The value range is 0.325V-2.0V, the voltage threshold is 0.325V, the voltage value of the high-level signal is 5V, and the voltage value of the low-level signal is 0V.

Both the fourth control signal QC_EN4 and the fifth control signal QC_EN5 in the second group of control signals are high-level signals, and when the protocol identification circuit 30' receives the second group of control signals, the first signal The output terminal D+ outputs a first signal whose voltage value is within the second threshold value range, the second signal output terminal D- outputs a second signal whose voltage value is within the first threshold value range, and the second The group induction signal is composed of the first signal having a voltage value within the second threshold value range and the second signal having a voltage value within the first threshold value range. In the embodiment of the present application, the range of the second threshold value is 2.0V-5.0V. In the embodiment of the present application, the protocol identification circuit 30' outputs the second set of induction signals after outputting the first set of induction signals to the charger 200 for more than 1.25s, which can induce the The charger 200 outputs a charging voltage of 9V according to the QC protocol.

Please refer to FIG. 7 . FIG. 7 is a schematic diagram of the circuit structure of the control module 40 in the embodiment of the present application. The control module 40 includes a micro-control module U2, wherein the micro-control module U2 may include a plurality of input and output ports, and the control module 40 may communicate with other functional modules or external devices through the plurality of input and output ports And information exchange, so that the connection, driving and control functions of the charging circuit 100' can be realized.

Exemplarily, the power supply port VDD/AVDD of the micro-control module U2 is used to receive the stable voltage VCC provided by the voltage stabilizing module 60, and the output port PC5/SEG13 is used to output the first control signal to the protocol identification circuit 30 QC_EN1, the output port PC4/SEG12 is used to output the second control signal QC_EN2 to the protocol identification circuit 30, the output port PC3/SWG11 is used to output the third control signal QC_EN3 to the protocol identification circuit 30, and the input port PA0/INT2/TCKO/ICPCK are used to receive the trigger signal VIN_INT output by the voltage detection module 20 .

In the embodiment of the present application, the charging circuit 100' further includes a voltage stabilizing module 60 connected to the charging interface 10 and/or the energy storage component 300, and the voltage stabilizing module 60 is used to receive the energy storage component 300 and/or the input voltage of the charging interface 10, and perform voltage conversion on the input voltage to output a stable voltage VCC, such as a 5V DC voltage, to provide various functional modules of the charging circuit 100' A stable power supply voltage, for example, provides a stable voltage VCC for the voltage source, and provides a stable voltage VCC for the control module 40 . Wherein, the voltage stabilizing module 60 may adopt a DC-DC converter or a linear voltage regulator, such as a low dropout linear regulator (low dropout regulator, LDO).

Please refer to FIG. 8, the embodiment of the present application also provides an electronic device 600, the electronic device 600 includes an energy storage component 300 and the charging circuit 100 or charging circuit 100' as described above, the energy storage component 300 and the The charging circuit is connected, and the charging circuit is used for receiving an external power source and charging the energy storage component 300 . Exemplarily, the charging circuit is connected to a charger 200, and the charger 200 charges the energy storage component 300 through the charging circuit. Exemplarily, the electronic device may include, but not limited to, a mobile phone, a tablet computer, and the like.

The electronic device provided by the present application uses a charging circuit and adopts a simple protocol identification circuit 30 instead of a protocol IC chip, so that a corresponding charging voltage can be induced from a charger according to a target charging protocol, and has a simple structure and low cost.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application rather than limit them. Although the present application has been described in detail with reference to the above preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present application can be The modification or equivalent replacement of the scheme shall not deviate from the spirit and scope of the technical scheme of the present application.

Claims

A charging circuit, characterized in that, comprising:

Charging interface, used to connect with the charger;

A control module, configured to output a control signal according to a preset output mode in response to the charging interface being connected to the charger;

A protocol identification circuit, configured to receive the control signal, and output an inducing signal according to the control signal, the inducing signal can be transmitted to the charger through the charging interface, so as to induce the charger to charge according to the target charging protocol The charging interface delivers charging voltage.
The charging circuit according to claim 1, wherein the protocol identification circuit includes a semiconductor element and/or a resistor, wherein the semiconductor element includes a transistor and/or a unidirectional conduction element.
The charging circuit according to claim 1, wherein the preset output mode includes a voltage value of at least one control signal and an output duration of the at least one control signal.
The charging circuit according to claim 1, wherein the protocol identification circuit comprises one or more control signal input terminals, and one or more signal output terminals, wherein one of the control signal input terminals receives The voltage value of the control signal affects at least one voltage value of the induced signal output from the signal output terminal.
The charging circuit according to claim 4, wherein the protocol identification circuit comprises two identification sub-modules, each identification sub-module is connected to at least one of the control signal input terminals and one of the signal output terminals, and each An identification sub-module is used to output an inductive signal of a corresponding voltage value at the signal output end connected to it according to the voltage value of the control signal received by the control signal input end connected to it.
The charging circuit according to claim 1, wherein the protocol identification circuit is connected to the charging interface and the control module respectively.
The charging circuit according to claim 4, wherein the charging interface includes a first signal pin and a second signal pin, and the signal output end includes a first signal output end and a second signal output end, wherein , the first signal output end is connected to the first signal pin, and the second signal output end is connected to the second signal pin.
The charging circuit according to claim 7, wherein the target charging protocol includes a QC protocol, the first signal pin is a D+ pin, and the second signal pin is a D- pin.
The charging circuit according to claim 7 or 8, wherein the control signals include a first group of control signals and a second group of control signals, and the induction signals include a first group of induction signals and a second group of induction signals;

The outputting the control signal according to the preset output mode specifically includes:

continuously outputting the first group of control signals;

When the continuous output time of the first group of control signals is greater than the preset time threshold, stop outputting the first group of control signals, and continue to output the second group of control signals;

The protocol identification circuit outputs the first group of induction signals according to the first group of control signals, and the protocol identification circuit outputs the second group of induction signals according to the second group of control signals, wherein the first The set of induction signals and the second set of induction signals are used to induce the charger to deliver a charging voltage to the charging interface according to a target charging protocol.
The charging circuit according to claim 9, wherein the control signal input terminal of the protocol identification circuit comprises a first input terminal, a second input terminal and a third input terminal;

Each group of control signals includes a first control signal, a second control signal and a third control signal;

The protocol identification circuit also includes:

The voltage input terminal is connected with the voltage source;

A first voltage divider circuit, connected between the voltage input end and the first ground point, the first voltage divider circuit includes a first voltage divider node connected to the first signal output end;

a first switch unit, the first connection end of the first switch unit is connected to the first signal output end through a resistor, and the second connection end of the first switch unit is connected to the first ground point; The control terminal of the first switch unit is connected to the first input terminal and used to receive the first control signal;

a second voltage dividing circuit connected between the voltage input terminal and the first ground point, the second voltage dividing circuit including a second voltage dividing node connected to the second signal output terminal;

The second switch unit is connected between the voltage input terminal and the second voltage divider circuit, the control terminal of the second switch unit is connected to the second input terminal, and is used to receive the second control signal ;as well as

The third switch unit is connected between the second voltage divider circuit and the first ground point, the control end of the third switch unit is connected to the third input end, and is used to receive the third control Signal.
The charging circuit according to claim 10, wherein the first switch unit and the third switch unit are high-level conduction switch units, and the second switch unit is a low-level conduction switch unit. ;

Both the first control signal and the second control signal in the first group of control signals are high-level signals, and the third control signal is a low-level signal; when the protocol identification circuit receives the first group of control signals , the first switch unit is turned on, the first signal output terminal outputs a first signal whose voltage value is within a first threshold value range, the second switch unit and the third switch unit are both disconnected, The second signal output terminal is suspended, wherein the first group of induced signals is the first signal whose voltage value is within the first threshold value range;

Both the first control signal and the second control signal in the second group of control signals are low-level signals, and the third control signal is a high-level signal; when the protocol identification circuit receives the second group of control signals , the first switch unit is turned off, the first signal output terminal outputs a first signal whose voltage value is within a second threshold value range, the second switch unit and the third switch unit are both turned on, The second signal output terminal outputs a second signal whose voltage value is within the first threshold value range, wherein the second group of induced signals is composed of the second signal whose voltage value is within the second threshold value range. The first signal is composed of the second signal whose voltage value is within the first threshold value range.
The charging circuit according to claim 9, wherein the control signal input terminal of the protocol identification circuit includes a fourth input terminal and a fifth input terminal;

Each group of control signals includes a fourth control signal and a fifth control signal;

The fourth input terminal is used to receive the fourth control signal, and the fifth input terminal is used to receive the fifth control signal;

The protocol identification circuit also includes:

a first resistor connected between the fifth input terminal and the first signal output terminal;

a second resistor connected between the first signal output terminal and the first ground point;

a first unidirectional conduction element, the anode of which is connected to the fourth input terminal, and the cathode connected to the first signal output terminal;

a third resistor connected in parallel with the first unidirectional conduction element between the fourth input terminal and the first signal output terminal;

a second unidirectional conduction element, the anode of which is connected to the second signal output terminal, and the cathode connected to the first ground point; and

The fourth resistor is connected between the second signal output terminal and the fourth input terminal.
The charging circuit according to claim 12, wherein the fourth control signal in the first group of control signals is a low-level signal, and the fifth control signal is a high-level signal, and the protocol identification circuit receives For the first group of control signals, the first signal output terminal outputs a first signal whose voltage value is within the first threshold value range, and the second signal output terminal outputs a second signal whose voltage value is less than the voltage threshold value, The first set of induced signals is composed of the first signal with a voltage value within the first threshold range and the second signal with a voltage value less than the voltage threshold;

The fourth control signal and the fifth control signal in the second group of control signals are both high-level signals, and when the protocol identification circuit receives the second group of control signals, the first signal output terminal outputs a voltage A first signal whose value is within a second threshold value range, the second signal output terminal outputs a second signal whose voltage value is within the first threshold value range, and the second group of induced signals consists of a voltage value within the The first signal within the second threshold value range is composed of the second signal with a voltage value within the first threshold value range.
The charging circuit according to claim 1, wherein the charging circuit further comprises a voltage detection module connected to the control module and the charging interface respectively, and the voltage detection module is used to detect the voltage of the charging interface. input voltage, and used for determining that the charging interface is connected to the charger according to the input voltage, and outputting a trigger signal to the control module; the control module is used for outputting the control signal in response to the trigger signal , so that the protocol identification circuit outputs the induction signal according to the control signal.
An electronic device, characterized in that it comprises:

energy storage components; and

The charging circuit according to any one of claims 1-14, wherein the energy storage component is connected to the charging circuit, and the charging circuit is used to receive an external power source and charge the energy storage component.