CN219892982U

CN219892982U - Charging circuit and electronic equipment

Info

Publication number: CN219892982U
Application number: CN202320785118.4U
Authority: CN
Inventors: 曹婉瑞; 潘惠芳; 李申健; 张国亮
Original assignee: Zhejiang Guozi Robot Technology Co Ltd
Current assignee: Zhejiang Guozi Robot Technology Co Ltd
Priority date: 2023-04-06
Filing date: 2023-04-06
Publication date: 2023-10-24
Anticipated expiration: 2033-04-06

Abstract

The utility model discloses a charging circuit, which relates to the field of circuits, and realizes control of a charging process by controlling the on and off of an MOS (metal oxide semiconductor) tube through an ideal diode controller, and the safety problem caused by the fact that a charging interface is always electrified is avoided by utilizing the unidirectional conductivity of the ideal diode controller; the linear region when the MOS tube is started is utilized, so that the current is ensured to be slowly increased, and the power-on impact is reduced; the low conduction internal resistance of the MOS tube when the MOS tube is completely conducted and the low conduction resistance of the ideal diode controller are utilized to ensure low heat generation and low voltage drop of the circuit, so that the problems that the battery cannot be fully charged, the heat generation is serious, the overload capacity is low and the like caused by adopting the diode are avoided. On the premise of ensuring the safety and reliability of the charging circuit, the application range of the whole charging circuit is expanded. The utility model also discloses electronic equipment which has the same beneficial effects as the charging circuit.

Description

Charging circuit and electronic equipment

Technical Field

The utility model relates to the field of circuits, in particular to a charging circuit. The utility model also relates to an electronic device.

Background

With the continuous development of electronic devices, the charging requirements for rechargeable electronic devices are higher and higher, for example, in order to meet more flexible charging requirements, electronic devices such as rechargeable robots, most of the electronic devices are charging functions realized through a charging interface and a corresponding charger, and particularly mobile robots. The current mobile robots generally have an automatic charging function, so a charging interface needs to be designed to realize the charging function. However, if the charging interface is directly connected with the battery pack inside the electronic device, the charging interface will be charged, especially for the industrial mobile robot, the battery voltage of the charging interface is high, and the charged charging interface is exposed to the outside, so that the safety problem is very easy to cause.

In the prior art, there are two solutions to the above problems. The first scheme is that a relay or a contactor is connected in series between a charging interface and a battery pack, and the connection and the separation of the battery pack, a charger and the charging interface are realized by controlling the attraction and the disconnection of relay contacts; after the robot finishes charging and leaves the charger, the contact is opened in time, so that a charging interface of the robot enters an uncharged state to ensure safety; but when a relay or contactor is used as a switching device for a robot charging interface, the corresponding relay or contactor must be able to withstand an impact current of several hundred amperes instantaneously when the contacts are attracted, and at the same time, be able to withstand a load capacity of several tens of amperes constantly. In the current market, the relay or contactor capable of meeting the requirements has short service life, large volume, high cost, complex control circuit design and high volume requirement, and cannot meet the requirements of increasingly compact electronic equipment, particularly mobile robots, and lower input cost. The second scheme is that a diode is connected in series between the charging interface and the battery pack, and the unidirectional conductivity of the diode is utilized to ensure that the charging interface is powered off after the robot is separated from a charger, so that the safety is ensured. However, the current and the charging voltage of the electronic device during charging are both relatively large, the heat productivity of the diode is extremely serious under the condition of larger current and charging voltage, and the battery pack cannot be matched with the charger to reach a full charge state due to the voltage drop of the diode, so that the loss is larger.

Disclosure of Invention

The utility model aims to provide a charging circuit and electronic equipment, wherein the control of the charging process of a battery pack is realized by controlling the on and off of an MOS (metal oxide semiconductor) tube through an ideal diode controller, meanwhile, the unidirectional conductivity of the ideal diode controller is utilized to ensure the safety of a charging interface and avoid the safety problem caused by the fact that the charging interface is always electrified; under the condition that the MOS tube is fully conducted, the extremely low conduction internal resistance ensures low heat generation and low voltage drop of the circuit, and meanwhile, the conduction resistance and the voltage drop of the ideal diode controller are low, so that the problems that a battery cannot be fully charged by a charger in the diode circuit, the heat generation is serious, the overload capacity is low and the like are avoided. On the premise of ensuring the reliability and safety of the charging circuit, the application range of the whole charging circuit is expanded.

In order to solve the technical problems, the utility model provides a charging circuit which is applied to electronic equipment, wherein the circuit comprises an MOS (metal oxide semiconductor) tube, a charging resistor, an ideal diode controller, a detection resistor and a charging interface, and a body diode is arranged in the MOS tube;

The charging interface is respectively connected with the source electrode of the MOS tube and the first input end of the ideal diode controller, the drain electrode of the MOS tube is respectively connected with the first end of the detection resistor and the first end of the charging resistor, the second end of the detection resistor is connected with the second input end of the ideal diode controller, the control end of the ideal diode controller is connected with the grid electrode of the MOS tube, and the second end of the charging resistor is connected with the battery pack of the electronic equipment;

the ideal diode controller is used for controlling the MOS tube to be conducted when the voltage difference between the first input end and the second input end of the ideal diode controller reaches a preset value, and controlling the MOS tube to be turned off when the voltage difference between the first input end and the second input end of the ideal diode controller does not reach the preset value.

Preferably, the ideal diode controller comprises a charge pump, a direct current source and a discharge loop;

the first input end of the charge pump is connected with the second end of the detection resistor through the second input end of the ideal diode controller, the second input end of the charge pump is connected with the source electrode of the MOS tube and the charging interface through the first input end of the ideal diode controller, the output end of the charge pump is connected with the first end of the direct current source, the second end of the direct current source is connected with the grid electrode of the MOS tube through the control end of the ideal diode controller, the first input end of the discharge loop is connected with the source electrode of the MOS tube and the charging interface through the first input end of the ideal diode controller, the second input end of the discharge loop is connected with the second end of the detection resistor through the second input end of the ideal diode controller, and the output end of the discharge loop is connected with the grid electrode of the MOS tube;

The charge pump is used for charging the grid electrode of the MOS tube by using the direct current source when the voltage difference between the first input end and the second input end of the ideal diode controller reaches a preset value so as to conduct the MOS tube;

the discharging loop is used for being conducted to discharge the grid electrode of the MOS tube when the voltage difference between the first input end and the second input end of the ideal diode controller does not reach a preset value, so that the MOS tube is turned off.

Preferably, the circuit further comprises a current detection circuit, wherein the input end of the current detection circuit is respectively connected with the first end and the second end of the charging resistor, and the current detection circuit is used for detecting the current flowing through the charging resistor based on the voltage difference between the two ends of the charging resistor.

Preferably, the current detection circuit comprises a comparator, a first voltage dividing resistor, a second voltage dividing resistor and a detection switch;

the first end of the first voltage dividing resistor is connected with the first end of the charging resistor, the second end of the first voltage dividing resistor is connected with the first input end of the comparator and the first end of the detection switch respectively, the second input end of the comparator is connected with the second end of the charging resistor, the output end of the comparator is connected with the control end of the detection switch, the second end of the detection switch is used as the output end of the current detection circuit and is connected with the first end of the second voltage dividing resistor, and the second end of the second voltage dividing resistor is grounded;

The comparator is used for controlling the detection switch to be turned on when the voltage at the two ends of the charging resistor reaches a preset voltage, and controlling the detection switch to be turned off when the voltage at the two ends of the charging resistor does not reach the preset voltage.

Preferably, the circuit further comprises a battery voltage detection circuit and a voltage clamping circuit;

the input end of the battery voltage detection circuit is connected with the battery pack, the output end of the battery voltage detection circuit is respectively connected with the charging interface, the source electrode of the MOS tube is connected with the first input end of the ideal diode controller, the control end of the MOS tube is connected with the output end of the voltage clamping circuit, and the input end of the voltage clamping circuit is connected with a charging control signal;

the voltage clamping circuit is used for controlling the battery voltage detection circuit to be conducted when receiving a charging control signal; and when the charging control signal is not received, controlling the battery voltage detection circuit to be turned off.

Preferably, the battery voltage detection circuit includes a battery switch, a first resistor and a second resistor;

the first end of the battery switch is respectively connected with the battery pack and the first end of the first resistor, the second end of the battery switch is respectively connected with the charging interface, the source electrode of the MOS tube is connected with the first input end of the ideal diode controller, the control end of the battery switch is respectively connected with the second end of the first resistor and the first end of the second resistor, and the second end of the second resistor is connected with the output end of the voltage clamping circuit.

Preferably, the battery voltage detection circuit further comprises a unidirectional conduction module, wherein an anode of the unidirectional conduction module is connected with the battery pack, and a cathode of the unidirectional conduction module is connected with the first end of the battery switch and the first end of the first resistor respectively.

Preferably, the voltage clamping circuit comprises a control switch, a third resistor and a fourth resistor;

the first end of the third resistor is connected with a charging control signal, the second end of the third resistor is respectively connected with the control end of the control switch and the first end of the fourth resistor, the second end of the fourth resistor is grounded, the first end of the control switch is grounded, and the second end of the control switch is used as the output end of the voltage clamping circuit and is connected with the control end of the battery voltage detection circuit;

the control switch is used for being conducted when receiving a charging control signal so as to conduct the battery voltage detection circuit; when the charging control signal is not received, the battery voltage detection circuit is turned off.

Preferably, the voltage clamping circuit further comprises a fifth resistor, wherein a first end of the fifth resistor is connected with a second end of the detection resistor and a second input end of the ideal diode controller respectively, and a second end of the fifth resistor is connected with a second end of the control switch and a control end of the battery voltage detection circuit respectively.

In order to solve the technical problem, the utility model also provides electronic equipment, which comprises a battery pack and the charging circuit, wherein the battery pack is connected with the charging circuit.

The utility model provides a charging circuit which is applied to electronic equipment and comprises an MOS (metal oxide semiconductor) tube, a charging resistor, an ideal diode controller, a detection resistor and a charging interface, wherein the ideal diode controller judges whether the electronic equipment enters a charging process or not by detecting voltages at two ends of a first input end and a second input end; when the charging process is not carried out, the charger is disconnected from the charging interface, no voltage difference exists between the first input end and the second input end of the ideal diode controller, and the ideal diode controller controls the MOS tube to be turned off, so that a charging loop cannot be formed. The whole charging circuit controls the on and off of the MOS tube through the ideal diode controller to realize the control of the charging process of the battery pack, meanwhile, the unidirectional conductivity of the ideal diode controller is utilized to ensure the safety of the charging interface, the safety problem caused by the fact that the charging interface is always electrified is avoided, meanwhile, the adopted MOS tube and the ideal diode controller are low in cost, small in size and easy to integrate, the whole circuit can be integrated on a PCB, the occupied space is greatly reduced, the linear region when the MOS tube is started is utilized, the slow start and the conduction are realized, the slow increase of current is ensured, and the electrification impact is reduced; under the condition that the MOS tube is fully conducted, the extremely low conduction internal resistance ensures low heat generation and low voltage drop of the circuit, and meanwhile, the conduction resistance and the voltage drop of the ideal diode controller are low, so that the problems that a battery cannot be fully charged by a charger in the diode circuit, the heat generation is serious, the overload capacity is low and the like are avoided. On the premise of ensuring the reliability and safety of the charging circuit, the application range of the whole charging circuit is expanded.

The utility model also provides electronic equipment, which has the same beneficial effects as the charging circuit.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required in the prior art and the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of a charging circuit according to the present utility model;

fig. 2 is a schematic structural diagram of another charging circuit according to the present utility model;

FIG. 3 is a block diagram of a charging circuit according to the present utility model;

FIG. 4 is a schematic diagram of an ideal diode controller according to the present utility model;

fig. 5 is a schematic structural diagram of a current detection circuit according to the present utility model;

fig. 6 is a schematic structural diagram of an electronic device according to the present utility model.

Detailed Description

The utility model has the core of providing a charging circuit and electronic equipment, wherein the control of the charging process of a battery pack is realized by controlling the on and off of an MOS (metal oxide semiconductor) tube through an ideal diode controller, meanwhile, the unidirectional conductivity of the ideal diode controller is utilized to ensure the safety of a charging interface and avoid the safety problem caused by the constant electrification of the charging interface, and meanwhile, the adopted MOS tube and the ideal diode controller have low cost, small volume and easy integration, the whole circuit can be integrated on a PCB (printed circuit board), the space occupation is greatly reduced, and the linear region when the MOS tube is started is utilized to slowly start and conduct, so that the current is ensured to be slowly increased and the electrification impact is reduced; under the condition that the MOS tube is fully conducted, the extremely low conduction internal resistance ensures low heat generation and low voltage drop of the circuit, and meanwhile, the conduction resistance and the voltage drop of the ideal diode controller are low, so that the problems that a battery cannot be fully charged by a charger in the diode circuit, the heat generation is serious, the overload capacity is low and the like are avoided. On the premise of ensuring the reliability and safety of the charging circuit, the application range of the whole charging circuit is expanded.

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The charging circuit provided by the utility model is suitable for electronic equipment, in particular for mobile robots in robots, is generally used for various electronic equipment for realizing charging through a charging interface, is not particularly limited to the specific type and implementation mode of the electronic equipment, and can be other types of electronic equipment, is not particularly limited to the type and implementation mode of a battery pack adopted in the electronic equipment, and can be various types of batteries such as a lithium battery or a lead-acid battery. Detailed description of the embodiments are described below.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a charging circuit according to the present utility model; referring to fig. 2, fig. 2 is a schematic structural diagram of another charging circuit according to the present utility model; charging terminal + and charging terminal in fig. 2-i.e. charging interface 1 described below; referring to fig. 3, fig. 3 is a block diagram illustrating a charging circuit according to the present utility model.

In order to solve the technical problems, the utility model provides a charging circuit 22 applied to electronic equipment 21, the circuit comprises a MOS tube D1, a charging resistor R1, an ideal diode controller 2, a detection resistor R2 and a charging interface 1, wherein a body diode is arranged in the MOS tube D1;

the charging interface 1 is respectively connected with a source electrode of a Metal-Oxide-Semiconductor Field-Effect Transistor (Metal-Oxide semiconductor field effect transistor) and a first input end of an ideal diode controller 2, a drain electrode of the MOS transistor D1 is respectively connected with a first end of a detection resistor R2 and a first end of a charging resistor R1, a second end of the detection resistor R2 is connected with a second input end of the ideal diode controller 2, a control end of the ideal diode controller 2 is connected with a gate electrode of the MOS transistor D1, and a second end of the charging resistor R1 is connected with a battery pack BAT of the electronic equipment 21;

The ideal diode controller 2 is configured to control the MOS transistor D1 to be turned on when a voltage difference between the first input terminal and the second input terminal of the ideal diode controller 2 reaches a preset value, and to control the MOS transistor D1 to be turned off when a voltage difference between the first input terminal and the second input terminal of the ideal diode controller 2 does not reach the preset value.

Specifically, when the electronic device 21 is charged through the charging interface 1, a charger is generally used as a charging source; when the electronic device 21 needs to be charged, the charger is connected with the charging interface 1, if the charger is capable of outputting voltage on the output terminal without detecting the battery state, after the charger contacts the charging interface 1, the charger directly enters a normal charging state, the charging process is started, higher voltage output by the charger flows into the battery pack BAT through the body diode of the MOS tube D1, a certain pressure difference is formed between the drain electrode and the source electrode of the MOS tube D1 at the moment, when the voltage difference passes through the detection resistor R2, the pressure difference is further increased, at the moment, the pressure difference between the first input end and the second input end of the ideal diode controller 2 is caused by the existence of the detection resistor R2, the ideal diode controller 2 controls the grid voltage of the MOS tube D1 after the pressure difference reaches a preset value, so as to control the conduction of the MOS tube D1, when the MOS tube D1 is conducted, the MOS tube D1 works in a linear region at first, the current flowing through the MOS tube D1 is smoothly increased, no peak current surge occurs at the moment of the pull-in, and after the MOS tube D1 is completely conducted through the battery pack, and the battery pack is completely charged by the battery pack, and the battery pack is completely consumed because of the charging resistor R1 is completely and the charging resistor R1 is completely ignored.

It can be understood that when the charger is connected to the charging interface 1, the body diode provided in the MOS transistor D1 may form a voltage difference through the detection resistor R2, so that the ideal diode controller 2 may determine whether the charger is connected to the charging interface 1 according to the voltage difference between the two input ends, that is, determine whether the electronic device 21 needs to enter the charging process through the voltage difference between the two input ends; when the electronic equipment 21 needs to enter a charging process, the ideal diode controller 2 controls the MOS tube D1 to be conducted so as to form a charging loop to supply power for the battery pack BAT; when the electronic device 21 does not need to enter the charging process, the ideal diode controller 2 controls the MOS transistor D1 to be turned off, and a charging loop does not need to be formed to supply power for the battery pack BAT. The specific value and implementation mode of the preset value are not particularly limited, and the preset value can be set to 0, so long as the ideal diode controller 2 detects the voltage difference, the conduction of the MOS tube D1 can be controlled, and the preset value can be adjusted according to the actual application requirement.

It should be noted that, the ideal diode controller 2 is a control chip, which may be equivalent to an ideal diode in a circuit, and has unidirectional conductivity and small internal resistance, and it is understood that the current of the ideal diode controller 2 is consistent with the current direction of the body diode of the MOS transistor D1. The ideal diode controller 2 can control the grid voltage of the MOS tube D1 in various modes, namely, after detecting the pressure difference, the ideal diode controller can control the charge pump arranged inside to charge, so as to quickly raise the grid voltage of the MOS tube D1; the control of the gate voltage of the MOS transistor D1 may be achieved by other means, and the present application is not particularly limited herein with respect to the specific type of the ideal diode controller 2, implementation and internal circuit configuration. The ideal diode controller 2 is adopted to control the MOS tube D1, and the ideal diode controller 2 does not need additional power supply of the battery pack BAT, so that the defect that the relay or the contactor cannot be normally closed to be difficult to realize a normal charging process due to the fact that the battery pack BAT cannot be normally powered under the protection conditions of over-discharge or over-current and the like in the prior art is avoided, the whole charging circuit can be accurately realized in the charging process of the normal working process of the electronic equipment 21 or under the condition of battery protection activation, and the use requirements under various states are met.

Specifically, for the MOS transistor D1, the specific type and implementation manner of the charging resistor R1, the detection resistor R2, and the charging interface 1 are not particularly limited herein; the MOS tube D1 is usually an NMOS tube; the charging resistor R1 and the detecting resistor R2 can be fixed resistors, variable resistors or other types of resistors and the like, and can be precise power sampling resistors with the size of 2mΩ; the material of the charging interface 1 and the like can be selected according to the application of the electronic device 21, the application scenario, and the like.

It can be understood that, considering the safety and reliability of the ideal diode controller 2, a protection circuit can be connected in parallel between the input end and the ground end of the ideal diode controller 2, as shown in fig. 2, overvoltage protection of the ideal diode controller 2 can be achieved through two voltage-stabilizing diode anti-parallel circuits, risks of damage caused by too high voltage or large current are avoided, and effects of electrostatic protection, voltage clamping and the like can be achieved. The protection circuit may also be implemented by a zener diode or other type of protection circuit, and the present application is not particularly limited herein.

Specifically, as shown in fig. 2, considering the real-time monitoring of the charging process, a light emitting diode may be connected to the positive electrode of the charging interface 1, and used as an indicator light to prompt whether the charging interface 1 is charged, to represent the charging state of the current charging current, further avoid risks such as contact exposure and electric shock, and ensure safety, or prompt modules such as other types of LED (Light Emitting Diode ) indicator lights may be used to implement prompt, and the specific type and implementation of the prompt module are not limited herein.

The charging circuit 22 provided by the utility model can solve the problems of easy adhesion, large volume and high cost when the charging interface 1 adopts a relay contact in the prior art, and simultaneously solve the problem that the electronic equipment 21 cannot control the relay to be attracted to charge and activate the battery under the power failure conditions such as over-discharge protection or over-current protection of the battery. The adopted MOS tube D1 has very excellent reliability and related performance, and meanwhile, the cost is very low, the MOS tube D1 is used as a switching device, so that various problems in the prior art can be solved, and the charging interface 1 is ensured to be in an uncharged safe state when the MOS tube D1 is turned off by utilizing the unidirectional conductive characteristic similar to a diode in the unopened state of the MOS tube D1 provided with the body diode; in addition, through reliable circuit design, the whole charging circuit can occupy a small space of a PCB (Printed Circuit Board ), can be integrated on other module PCBs or used as an independent module, and can greatly improve the usability in the internal space of the robot.

The utility model provides a charging circuit 22, which is applied to electronic equipment 21 and comprises a MOS (metal oxide semiconductor) tube D1, a charging resistor R1, an ideal diode controller 2, a detection resistor R2 and a charging interface 1, wherein the ideal diode controller 2 judges whether the electronic equipment 21 enters a charging process or not by detecting voltages at two ends of a first input end and a second input end, when the electronic equipment 21 enters the charging process, a charger is connected with the charging interface 1, a body diode in the MOS tube D1 is conducted, current flows through the detection resistor R2, and when the voltage difference between the first input end and the second input end of the ideal diode controller 2 reaches a preset value, the ideal diode controller 2 controls the MOS tube D1 to be conducted, and a charging opportunity charges a battery pack BAT through a loop formed by the MOS tube D1 and the charging resistor R1; when the charging process is not performed, the charger is disconnected from the charging interface 1, no voltage difference exists between the first input end and the second input end of the ideal diode controller 2, and the ideal diode controller 2 controls the MOS tube D1 to be turned off, so that a charging loop cannot be formed. The whole charging circuit 22 controls the on and off of the MOS tube D1 through the ideal diode controller 2 to realize the control of the charging process of the battery pack BAT, meanwhile, the unidirectional conductivity of the ideal diode controller 2 is utilized to ensure the safety of the charging interface 1, the safety problem caused by the fact that the charging interface 1 is always electrified is avoided, meanwhile, the adopted MOS tube D1 and the ideal diode controller 2 are low in cost, small in size and easy to integrate, the whole circuit can be integrated on a PCB, the occupied space is greatly reduced, the linear region when the MOS tube D1 is started is utilized, the slow start and the conduction are realized, the slow increase of current is ensured, and the electrifying impact is reduced; under the condition that the MOS tube D1 is fully conducted, the extremely low conduction internal resistance ensures low heat generation and low voltage drop of the circuit, and meanwhile, the conduction resistance and the voltage drop of the ideal diode controller 2 are low, so that the problems that a battery cannot be fully charged by a charger in the diode circuit, the heat generation is serious, the overload capacity is low and the like are avoided. On the premise of ensuring the reliability and safety of the charging circuit 22, the application range of the whole charging circuit 22 is expanded.

On the basis of the above-described embodiments,

referring to fig. 4, fig. 4 is a schematic structural diagram of an ideal diode controller according to the present utility model.

As a preferred embodiment, the ideal diode controller 2 comprises a charge pump, a direct current source and a discharge loop;

the first input end of the charge pump is connected with the second end of the detection resistor R2 through the second input end of the ideal diode controller 2, the second input end is connected with the source electrode of the MOS tube D1 and the charging interface 1 respectively through the first input end of the ideal diode controller 2, the output end is connected with the first end of the direct current source, the second end of the direct current source is connected with the grid electrode of the MOS tube D1 through the control end of the ideal diode controller 2, the first input end of the discharge loop is connected with the source electrode of the MOS tube D1 and the charging interface 1 respectively through the first input end of the ideal diode controller 2, the second input end is connected with the second end of the detection resistor R2 through the second input end of the ideal diode controller 2, and the output end is connected with the grid electrode of the MOS tube D1;

the charge pump is used for charging the grid electrode of the MOS tube D1 by using a direct current source when the voltage difference between the first input end and the second input end of the ideal diode controller 2 reaches a preset value so as to conduct the MOS tube D1;

The discharging loop is used for being conducted to discharge the grid electrode of the MOS tube D1 when the voltage difference between the first input end and the second input end of the ideal diode controller 2 does not reach a preset value, so that the MOS tube D1 is turned off.

It can be understood that the control of the gate voltage of the MOS transistor D1 by the ideal diode controller 2 can be realized by a charge pump (charge pump) and a discharge loop; the charge pump and the direct current source can be charged when the voltage difference between the first input end and the second input end of the ideal diode controller 2 reaches a preset value, the grid voltage of the MOS tube D1 is rapidly lifted, and the MOS tube D1 is controlled to be fully conducted in millisecond time; the discharging loop may be turned on when the voltage difference between the first input terminal and the second input terminal of the ideal diode controller 2 does not reach a preset value, so as to realize the turn-off of the MOS transistor D1 by discharging the gate of the MOS transistor D1.

The specific type and implementation of the charge pump, the dc source, and the discharge circuit are not particularly limited herein; specific parameters of the charge pump and the like can be selected according to the threshold voltage and the like of the MOS tube D1; there are various implementations of the specific circuit configuration of the discharge loop, etc., which can be selected and adjusted according to the specific internal configuration of the ideal diode controller 2, etc.

Specifically, the ideal diode controller 2 may directly connect two input ends of the charge pump to the first input end and the second input end of the ideal diode controller 2 to control the turn-on process of the MOS transistor D1, and connect two input ends of the discharge loop to the first input end and the second input end of the ideal diode controller 2 to control the turn-off process of the MOS transistor D1, or as shown IN fig. 4, the discharge loop shown IN fig. 4 may be formed by two triodes and a dc source connected to the triodes, and by connecting the two input ends of the discharge loop, i.e. the bases of the two triodes, to the IN end and the OUT end of the ideal diode controller 2, the voltage difference between the first input end and the second input end of the ideal diode controller 2 is represented by detecting the voltages of the IN end and the OUT end of the ideal diode controller 2.

As a specific embodiment, as shown IN fig. 4, the IN port is a first input terminal of the ideal diode controller 2, the VS port is a second input terminal of the ideal diode controller 2, the GATE is a control terminal of the ideal diode controller 2, the OUT port is an output terminal of the ideal diode controller 2, GND is a ground terminal, and the charge pump IN the figure is respectively connected with the IN port and the VS port of the ideal diode controller 2, while further defining a current direction by means of a diode, and then connected with the GATE of the MOS transistor D1 through a direct current source; the MOSFET Off realizes the protection turn-Off of the MOS tube D1 through the control of two comparators and an OR gate, when the comparators connected with the IN port and the OUT port detect that the port voltage is lower than a first specified value, a high level is output, when the comparators connected with the OFF port detect that the voltage of a circuit connected with the OFF port is lower than a second specified value, a high level is output, when the two comparators have the output high level, the OR gate outputs the high level to control the MOSFET Off to be conducted, the grid of the MOS tube D1 is rapidly discharged through the MOSFET Off, and therefore the MOS tube D1 is rapidly turned Off. That is, when the voltage in the circuit is lower than the specified value, the judgment circuit is not in the normal working state at the moment, and the MOS tube D1 needs to be turned off in time to protect the circuit, so that the power consumption is reduced.

As a specific implementation of the ideal diode controller 2, the control of the gate voltage of the MOS transistor D1 can be implemented by a charge pump and a discharge loop; the charge pump has higher efficiency, can provide faster dynamic response, and the grid voltage of the MOS tube D1 is rapidly raised through the charge of the charge pump; the discharge loop can rapidly reduce the voltage of the grid electrode of the MOS tube D1 through rapid discharge; the control of the voltage of the grid electrode of the MOS tube D1 is realized through the charge pump and the discharge loop, so that the response speed of the whole circuit is improved, the quick response of the MOS tube D1 is ensured, the charging efficiency is improved, and the loss is further reduced.

As a preferred embodiment, the circuit further comprises a current detection circuit 3, and the input terminal of the current detection circuit 3 is connected to the first terminal and the second terminal of the charging resistor R1, respectively, for detecting the current flowing through the charging resistor R1 based on the voltage difference across the charging resistor R1.

Considering that the charging current needs to be monitored in the charging process, so as to further ensure the safety and reliability of the circuit, a current detection circuit 3 connected in parallel to two ends of the charging resistor R1 is added, the voltage drop generated after the charging current flows through the charging resistor R1 is represented by the current detection circuit 3, the output end of the current detection circuit 3 can be connected with a remote controller such as an MCU (Microcontroller Unit, micro control unit) and other devices, the output signal is converted into a voltage digital signal which can be directly measured by the controller after analog-to-digital conversion through an ADC (analog to digital converter), and the real-time monitoring of the charging current can be realized after software quantization. The specific circuit configuration and implementation of the current detection circuit 3 are not particularly limited herein. The related prompt module can be additionally arranged, and prompt operations such as alarming and the like are implemented when the charging current is higher than the threshold value, so that operators can timely perform safety operations such as power failure and the like, and potential safety hazards are further avoided.

Specifically, the current detection circuit 3 connected in parallel to the two ends of the charging resistor R1 is added, and the charging current is monitored through the voltage drop at the two ends of the charging resistor R1, so that the real-time monitoring of the charging current is further realized, the current risks such as overcurrent which possibly exist are avoided, and meanwhile, an operator can monitor the charging process through the charging current, so that the safety and the reliability of the charging circuit 22 are further ensured.

Referring to fig. 5, fig. 5 is a schematic structural diagram of a current detection circuit according to the present utility model.

As a preferred embodiment, the current detection circuit 3 includes a comparator U1, a first voltage dividing resistor R8, a second voltage dividing resistor R9, and a detection switch Q1;

the first end of the first voltage dividing resistor R8 is connected with the first end of the charging resistor R1, the second end of the first voltage dividing resistor R8 is respectively connected with the first input end of the comparator U1 and the first end of the detection switch Q1, the second input end of the comparator U1 is connected with the second end of the charging resistor R1, the output end of the comparator U1 is connected with the control end of the detection switch Q1, the second end of the detection switch Q1 is used as the output end of the current detection circuit 3 and is connected with the first end of the second voltage dividing resistor R9, and the second end of the second voltage dividing resistor R9 is grounded;

The comparator U1 is configured to control the detection switch Q1 to be turned on when the voltage across the charging resistor R1 reaches a preset voltage, and to control the detection switch Q1 to be turned off when the voltage across the charging resistor R1 does not reach the preset voltage.

Specifically, the voltage at two ends of the charging resistor R1 is detected and compared by the comparator U1, when the voltage at two ends of the charging resistor R1 reaches a preset voltage, the comparator U1 outputs a high level, the detection switch Q1 is controlled to be turned on, at this time, the current detection circuit 3 is a voltage division circuit formed by a first voltage division resistor R8 and a second voltage division resistor R9, the output end of the current detection circuit is connected to the first end of the second voltage division resistor R9, the voltage at two ends of the charging resistor R1 is converted into a corresponding current signal by the detection switch Q1, and then the corresponding current signal is converted into a voltage signal by the voltage division circuit to be output. The current detection circuit 3 may be further connected to the controller after outputting the voltage signal, and converts the output voltage signal into a digital signal that can be identified by the controller through the controller or the ADC, so that the controller may quantize the voltage signal by using related software, to realize real-time monitoring of the charging current, and if the charging current exceeds the threshold value, the electronic device 21 may be rapidly controlled to be disconnected from charging.

As shown in fig. 5, the common-mode voltage generated by the charging current flowing through the charging resistor R1 is converted into the current flowing through the triode Q1, and then the ground resistor is converted into the low-voltage signal which can be collected by the ADC, so that the MCU can monitor the whole charging and discharging current of the battery. Reference data is provided for the state of charge, scheduling control, etc. of the electronic device 21. It should be noted that, the specific value and implementation manner of the preset voltage are not limited herein, and the current detection module is turned on only when the voltage at two ends of the charging resistor R1 reaches the preset voltage, that is, the charging current reaches a certain value and then is monitored, or the preset voltage can be directly set to be 0, and the charging current in the circuit is monitored and can be better protected. The specific types and implementation manners of the detection switch Q1, the first voltage dividing resistor R8, the second voltage dividing resistor R9, and the like of the comparator U1 are not particularly limited herein, the detection switch Q1 may be a triode, and the first voltage dividing resistor R8 and the second voltage dividing resistor R9 may be fixed resistors or may be other types of resistors such as variable resistors.

Specifically, the function of the current detection circuit 3 is realized through the comparator U1, the detection switch Q1, the first voltage dividing resistor R8 and the second voltage dividing resistor R9, the circuit structure is simple and easy to realize, the adopted device is low in cost and small in size, the real-time monitoring of the charging current is realized, the safety risk is further avoided, and the safety and reliability of the whole charging circuit 22 are improved.

As a preferred embodiment, the circuit further comprises a battery voltage detection circuit 4 and a voltage clamping circuit 5;

the input end of the battery voltage detection circuit 4 is connected with the battery pack BAT, the output end is respectively connected with the charging interface 1, the source electrode of the MOS tube D1 and the first input end of the ideal diode controller 2, the control end is connected with the output end of the voltage clamping circuit 5, and the input end of the voltage clamping circuit 5 is connected with a charging control signal;

the voltage clamping circuit 5 is used for controlling the battery voltage detection circuit 4 to be conducted when receiving a charging control signal; when the charge control signal is not received, the battery voltage detection circuit 4 is controlled to be turned off.

Considering that some chargers are internally provided with an output switch, and the output switch needs to be turned on only when the battery voltage is detected, when the charger is in contact with the charging interface 1, the output switch cannot be turned on to charge the battery because the battery voltage cannot be detected. Therefore, for this type of charger, when the charging interface 1 contacts the charging pile or the charger is ready to be charged, the battery voltage detection circuit 4 and the voltage clamping circuit 5 need to be additionally provided to enable in advance, so that the charging interface 1 is charged, and the charger opens the output switch to perform the charging process. In the non-charging state, the voltage clamping circuit 5 does not receive the charging control signal, and controls the battery voltage detection circuit 4 to be turned off, so that the battery voltage of the battery pack BAT is cut off; when the charging process needs to be entered, the voltage clamping circuit 5 receives a charging control signal to control the battery voltage detection circuit 4 to be conducted, the battery pack BAT and the charging interface 1 directly form a loop, at this time, the battery pack BAT outputs a battery voltage to the charging interface 1, and the charging opportunity detects the battery voltage through the charging interface 1, so that the output switch is opened, and the charger enters a normal charging state, consistent with the charging process of the charger, and will not be repeated here.

It will be appreciated that, if the electronic device 21 is a lithium battery, in practical application, since the electronic device 21 will normally operate for a long time, the battery will be fully charged and discharged, so as to calibrate the power monitoring function of the BMS (Battery Management System ) protection board provided in the battery pack BAT, so that the battery pack BAT of the electronic device 21 can operate normally. At this time, the charging interface 1 is required to be changed from a charging port to a discharging port, and the equipment connected with the charging interface 1 is changed from a charger to a resistor or other discharging equipment to rapidly discharge the battery. Under normal conditions, the battery cannot be discharged due to unidirectional conductivity of the circuit of the ideal diode controller 2, so that the battery is discharged by adding the battery voltage detection circuit 4 and the voltage clamping circuit 5, the battery voltage detection circuit 4 is controlled to be conducted by the voltage clamping circuit 5 under the action of a charging control signal, a certain voltage difference is established between the source electrode and the drain electrode of the MOS tube D1 when the battery voltage is output by the charging interface 1, after the voltage difference reaches a preset value, the conduction of the MOS tube D1 is controlled by the ideal diode controller 2, the purpose of bidirectional conduction is achieved, and at the moment, the battery can be rapidly discharged through the conducted MOS tube D1 and the ideal diode controller 2.

Specifically, the specific circuit structures and implementation manners of the battery voltage detection circuit 4 and the voltage clamp circuit 5 are not particularly limited herein, and the control process of the charging control signal on the discharging process of the charging interface 1 can be realized through a switching device such as a triode or a MOS tube. The battery voltage detection circuit 4 and the voltage clamping circuit 5 can ensure that the charger can simply charge the battery from the charging interface 1 under the protection conditions of over-discharge and the like of the battery, and the battery is activated, so that the problem that in the prior art, under the protection conditions of over-discharge or over-current and the like of the battery, the relay is required to be opened or the relay is skipped to charge the battery is solved.

Considering that in the prior art, a charging mode using a diode cannot be used by matching with an intelligent charger with a battery voltage detection function due to unidirectional conductivity of the diode, so that the charger may not recognize a battery, in this embodiment, the battery voltage detection circuit 4 and the voltage clamping circuit 5 are additionally arranged, and the voltage clamping circuit 5 is used for controlling the battery voltage detection circuit 4 to enable in advance by using a charging control signal, so that the intelligent charger with the battery voltage detection function can also charge through the charging circuit 22 provided by the application, thereby meeting the requirement of daily charging of the electronic equipment 21 matched with the intelligent charger, expanding the application range of the charging circuit 22, and completing the activation and charging work of the battery under the conditions of protecting the battery of the electronic equipment and completely powering down. Compared with a non-intelligent charger, the charger is not required to be in an output state all the time, so that the charging interface 1 is further prevented from being electrified all the time, risks such as contact exposure or electric shock are avoided, and the safety and reliability of the whole charging process are further improved.

As a preferred embodiment, the battery voltage detection circuit 4 includes a battery switch D2, a first resistor R4 and a second resistor R5;

the first end of the battery switch D2 is respectively connected with the battery pack BAT and the first end of the first resistor R4, the second end is respectively connected with the charging interface 1, the source electrode of the MOS tube D1 and the first input end of the ideal diode controller 2, the control end is respectively connected with the second end of the first resistor R4 and the first end of the second resistor R5, and the second end of the second resistor R5 is connected with the output end of the voltage clamping circuit 5.

Specifically, the battery voltage detection circuit 4 is turned on and off through the on and off of the battery switch D2, the first resistor R4 and the second resistor R5 form a voltage dividing circuit and are connected with the output end of the voltage clamping circuit 5, and accurate control of the voltage of the control end of the battery switch D2 is further achieved through the voltage dividing circuit, so that accurate control of the battery switch D2 is achieved. For the battery switch D2, specific types and implementation manners of the first resistor R4 and the second resistor R5 are not limited herein, the battery switch D2 may be implemented by selecting a MOS transistor, and the first resistor R4 and the second resistor R5 may be implemented by selecting a fixed resistor or other types of resistors.

Through battery switch D2, the function of battery voltage detection circuit 4 is realized to first resistance R4 and second resistance R5, and the switch-on and the switch-off of battery voltage detection circuit 4 are realized through battery switch D2's switch-on and switch-off, realize the accurate control to battery switch D2 through bleeder circuit, and first resistance R4 and second resistance R5 can current-limiting simultaneously, further protection circuit, and circuit structure is simple, easily realizes, has realized the function of battery voltage detection circuit 4 effectively.

As a preferred embodiment, the battery voltage detection circuit 4 further includes a unidirectional conduction module D4, where an anode of the unidirectional conduction module D4 is connected to the battery pack BAT, and a cathode is connected to the first terminal of the battery switch D2 and the first terminal of the first resistor R4, respectively.

It can be understood that after the battery voltage detection circuit 4 is successfully enabled and the charger enters the normal charging process, the high voltage and larger charging current of the charger enter the charging circuit 22 through the charging interface 1, and the unidirectional conduction module D4 connected with the battery pack BAT is added to the battery voltage detection circuit 4 in consideration of possible current backflow of the battery voltage detection circuit 4, so that the specific type and implementation of the unidirectional conduction module D4 are not particularly limited, and the application can be implemented by using a diode.

Specifically, the unidirectional conduction module D4 connected with the battery pack BAT is added, so that the damage of the battery pack BAT or the loss of related devices in the battery voltage detection circuit 4 caused by current backflow are avoided, the safe use of the battery pack BAT is ensured, and the safety and reliability of the charging circuit 22 are further ensured.

As a preferred embodiment, the voltage clamping circuit 5 comprises a control switch D5, a third resistor R6 and a fourth resistor R7;

the first end of the third resistor R6 is connected with a charging control signal, the second end of the third resistor R6 is respectively connected with the control end of the control switch D5 and the first end of the fourth resistor R7, the second end of the fourth resistor R7 is grounded, the first end of the control switch D5 is grounded, and the second end of the third resistor R5 is used as the output end of the voltage clamping circuit 5 and is connected with the control end of the battery voltage detection circuit 4;

the control switch D5 is configured to be turned on to turn on the battery voltage detection circuit 4 when receiving the charging control signal; when the charge control signal is not received, the battery voltage detection circuit 4 is turned off to be turned off.

Specifically, the voltage clamping circuit 5 controls the on and off of the control switch D5 through the charging control signal to control the battery voltage detection circuit 4, the voltage division voltage formed by the third resistor R6 and the fourth resistor R7 plays a role in limiting current while ensuring the accurate implementation of the control switch D5, the circuit can be further protected, the specific type and implementation mode of the control switch D5, the third resistor R6 and the fourth resistor R7 and the like are not limited herein, the control switch D5 can be implemented by adopting a triode, and the first resistor R4 and the second resistor R5 can be implemented by selecting a fixed resistor or other types of resistors.

The voltage clamping circuit 5 is realized through the control switch D5, the third resistor R6 and the fourth resistor R7, the control on the on and off of the battery voltage detection circuit 4 is realized through the on and off of the control switch D5, the accurate control on the control switch D5 is realized through the voltage dividing circuit, meanwhile, the third resistor R6 and the fourth resistor R7 can limit current, the circuit is further protected, and a working datum point is provided for the control switch D5.

As a preferred embodiment, the voltage clamping circuit 5 further comprises a fifth resistor R3, wherein a first end of the fifth resistor R3 is connected to a second end of the detection resistor R2 and a second input end of the ideal diode controller 2, respectively, and a second end is connected to a second end of the control switch D5 and a control end of the battery voltage detection circuit 4, respectively.

Considering that the battery voltage detection circuit 4 can quickly enable the charger to enter a normal charging state after outputting voltage, in order to ensure that the MOS tube D1 can be quickly conducted to charge the battery pack BAT after the charger enters a charging process, a fifth resistor R3 is additionally arranged, when a charging control signal exists, the fifth resistor R3 can pull down the detection resistor R2 through the conducted control switch D5, so that the pressure difference at two ends of the ideal diode controller 2 quickly reaches a preset value, the pressure difference between the drain electrode and the source electrode of the MOS tube D1 is clamped in a larger section, the reliable control of the MOS tube D1 of the ideal diode controller 2 is ensured to be completely conducted, and the normal running of the charging process is quickened. The specific type of the fifth resistor R3, the resistance value, implementation, etc. are not particularly limited herein, and a fixed resistor or other type of resistor may be selected for implementation.

Specifically, a fifth resistor R3 is additionally arranged, under the condition that the control switch D5 is turned on, the detection resistor R2 is pulled down, the voltage difference between the drain electrode and the source electrode of the MOS tube D1 is clamped in a larger interval, the ideal diode controller 2 is ensured to reliably control the complete conduction of the MOS tube D1, the charging process is accelerated, the charging efficiency is further improved, and the time is saved.

As a specific embodiment, referring to fig. 2, in fig. 2, a capacitor C1 connected in parallel to two ends of a first resistor R4 is further provided in the battery voltage detection circuit 4, where the capacitor C1 has an energy storage function, and can provide a freewheeling channel for the battery switch D2; meanwhile, a fuse connected in series in the circuit is additionally arranged in the battery voltage detection circuit 4, so that the circuit is further protected; meanwhile, considering that the voltage clamping circuit 5 additionally sets a diode D3 connected in series with the fifth resistor R3 through the clamping action of the fifth resistor R3 on the voltage at the two ends of the drain electrode and the source electrode of the MOS tube D1, the current direction is further regulated, and the current is prevented from flowing backwards, so that the pull-down of the detection resistor R2 is realized. In the battery voltage detection circuit 4, the battery pack BAT charges the first resistor R4 and the capacitor C1 through the unidirectional conduction module D4, and when the charging control signal is not input, the second resistor R5 is non-conductive to ground, the gate voltage of the battery switch D2 is equal to the source voltage, the non-conductive is performed, and the battery voltage output by the battery pack BAT is cut off. When an external high-level charging control signal is input to a signal access point of the voltage clamping circuit 5, after current is limited through the third resistor R6, the control switch D5 is turned on, the capacitor C1 discharges through the second resistor R5 and the control switch D5, and when the voltage-VGS is larger than the MOS on threshold, the battery switch D2 is slowly turned on, so that the battery voltage can be output to the charging terminal through the fuse. At this time, the battery voltage can be detected by the charger, and the charger enters a charging state. When the output switch of the charger is turned on, the charger enters a normal charging state, meanwhile, the detection resistor R2 is pulled down to the ground through the fifth resistor R3, the diode D3 and the control switch D5, the voltage difference between the drain and the source of the MOS tube D1 is clamped in a larger section, the reliable control of the MOS tube D1 of the ideal diode controller 2 is ensured to be fully conducted, and the large current charges the battery through the MOS tube D1. Moreover, due to the unidirectional conduction module D4, the charging current cannot pass through the battery voltage detection circuit 4, protecting the circuit device from damage while operating in the normal range. When the charging is completed, after the external charging control signal is removed, the voltage division loop of the fifth resistor R3 is turned off, the detection resistor R2 is pulled up to the battery voltage, at the moment, the ideal diode controller 2 detects that the voltages between the drain and the source of the MOS tube D1 are equal, then the MOS tube D1 is turned off, the voltage stored in the junction capacitor of the MOS tube D1 is consumed by the LED indicator lamp connected with the port, and the charging interface 1 is restored to the uncharged state. In addition, two LED indicator lamps provided in the circuit may indicate whether the charging terminal is charged and whether the charging control signal has been output, respectively. The charging state of the staff is reminded, and risks such as contacts are avoided.

Referring to fig. 6, fig. 6 is a schematic structural diagram of an electronic device according to the present utility model.

In order to solve the above technical problem, the present utility model further provides an electronic device 21, which includes a battery pack BAT and a charging circuit 22 as described above, wherein the battery pack BAT is connected to the charging circuit 22.

The present utility model is not particularly limited herein with respect to the specific type and implementation of the battery pack BAT, and may be a lithium battery or other type of battery pack BAT, which may further include various functions such as battery monitoring.

For the description of the electronic device 21 provided by the present utility model, please refer to the embodiment of the charging circuit 22 described above, and the description thereof is omitted herein.

In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.

It should also be noted that in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The charging circuit is characterized by comprising a MOS (metal oxide semiconductor) tube, a charging resistor, an ideal diode controller, a detection resistor and a charging interface, wherein a body diode is arranged in the MOS tube;

2. The charging circuit of claim 1, wherein the ideal diode controller comprises a charge pump, a direct current source, and a discharge loop;

3. The charging circuit of claim 1, further comprising a current detection circuit having input terminals coupled to the first and second terminals of the charging resistor, respectively, for detecting a current flowing through the charging resistor based on a voltage difference across the charging resistor.

4. The charging circuit of claim 3, wherein the current detection circuit comprises a comparator, a first voltage dividing resistor, a second voltage dividing resistor, and a detection switch;

5. The charging circuit of any one of claims 1 to 4, further comprising a battery voltage detection circuit and a voltage clamp circuit;

6. The charging circuit of claim 5, wherein the battery voltage detection circuit comprises a battery switch, a first resistor and a second resistor;

7. The charging circuit of claim 6, wherein the battery voltage detection circuit further comprises a unidirectional conduction module, an anode of the unidirectional conduction module being connected to the battery pack, and a cathode being connected to the first terminal of the battery switch and the first terminal of the first resistor, respectively.

8. The charging circuit of claim 5, wherein the voltage clamp circuit comprises a control switch, a third resistor and a fourth resistor;

9. The charging circuit of claim 8, wherein the voltage clamp circuit further comprises a fifth resistor having a first terminal connected to the second terminal of the sense resistor and the second input terminal of the ideal diode controller, respectively, and a second terminal connected to the second terminal of the control switch and the control terminal of the battery voltage sense circuit, respectively.

10. An electronic device comprising a battery pack and a charging circuit according to any one of claims 1 to 9, the battery pack being connected to the charging circuit.