CN117543783B

CN117543783B - Charging circuit, electronic device, and charging control method

Info

Publication number: CN117543783B
Application number: CN202410037555.7A
Authority: CN
Inventors: 陈远兵; 陈昌禧
Original assignee: Honor Device Co Ltd
Current assignee: Honor Device Co Ltd
Priority date: 2024-01-10
Filing date: 2024-01-10
Publication date: 2024-06-25
Anticipated expiration: 2044-01-10
Also published as: CN117543783A

Abstract

The application provides a charging circuit, electronic equipment and a charging control method, relates to the technical field of electronic equipment, and can solve the problem that other electronic devices in the electronic equipment are easy to damage when a charging circuit of the electronic equipment is cut off by a protection circuit. The charging circuit is used for charging the battery. The charging circuit includes: a power supply interface; the input end of the charging sub-circuit is coupled with the power supply interface, and the output end of the charging sub-circuit is used for being coupled with the battery; the charging sub-circuit comprises a protection unit, wherein the protection unit is used for disconnecting the connection between the input end of the charging sub-circuit and the output end of the charging sub-circuit when the voltage value of the input end of the charging sub-circuit is greater than or equal to a preset voltage value; and the discharging sub-circuit is coupled with the input end of the charging sub-circuit, and discharges the input end of the charging sub-circuit when the voltage of the input end of the charging sub-circuit is larger than or equal to a preset voltage value.

Description

Charging circuit, electronic device, and charging control method

Technical Field

The embodiment of the application relates to the field of electronic equipment, in particular to a charging circuit, electronic equipment and a charging control method.

Background

With the rapid development of electronic technology, the popularity of electronic devices such as mobile phones and tablet computers is increasing, and the charging voltage of these electronic devices is also increasing. In order to improve the safety of the electronic equipment, a part of the electronic equipment is provided with a protection circuit, and the protection circuit can cut off the connection (short for a charging loop) between a power supply interface and a battery of the electronic equipment when the charging voltage of the electronic equipment is too high.

However, the protection circuit is liable to cause damage to other electronic devices in the electronic apparatus when the charging circuit of the electronic apparatus is cut off.

Disclosure of Invention

The embodiment of the application provides a charging circuit, electronic equipment and a charging control method, which are used for solving the problem that other electronic devices in the electronic equipment are easy to damage when a charging circuit of the electronic equipment is cut off by a protection circuit.

In order to achieve the above purpose, the embodiment of the present application adopts the following technical scheme:

In a first aspect, a charging circuit is provided. The charging circuit may include a power supply interface, a charging sub-circuit, and a discharging sub-circuit. The input end of the charging sub-circuit is coupled with the power supply interface, and the output end of the charging sub-circuit is coupled with the battery. In this way, the charging sub-circuit is able to transfer the power provided by the power interface to the battery, thereby charging the battery.

The charging sub-circuit includes a protection unit that may be used to prevent the voltage provided by the charging sub-circuit when charging the battery from being excessive. The protection unit is connected in series between the input end of the charging sub-circuit and the output end of the charging sub-circuit, and when the voltage value of the input end of the charging sub-circuit is greater than or equal to a preset voltage value, the protection unit disconnects the connection between the input end of the charging sub-circuit and the output end of the charging sub-circuit, so that the power supply interface and the battery cannot be charged through the charging sub-circuit, and the problem that the battery is damaged due to overlarge voltage provided by the charging sub-circuit to the battery is prevented.

The bleeder subcircuit may be coupled to an input of the charging subcircuit. The bleeder sub-circuit may be used to discharge power from the input of the charging sub-circuit. In an exemplary embodiment, when the voltage at the input end of the charging sub-circuit is greater than or equal to the preset voltage value, the discharging sub-circuit discharges the input end of the charging sub-circuit, so as to avoid the voltage at the input end of the charging sub-circuit from affecting other electronic devices in the charging circuit.

Therefore, when the charging sub-circuit charges the battery, if the voltage value of the input end of the charging sub-circuit is larger than or equal to the preset voltage value, the charging circuit can cut off the coupling between the power supply interface and the battery through the protection unit, so that the charging sub-circuit stops charging the battery. Meanwhile, the charging circuit can discharge the input end of the charging sub-circuit through the discharging sub-circuit.

When the charging circuit charges the battery, the charging circuit can prevent the voltage provided by the power supply interface to the battery from being overlarge through the protection unit, so that the battery is damaged. And when the protection unit cuts off the connection between the power supply interface and the battery, the charging circuit can discharge the input end of the charging sub-circuit through the discharging sub-circuit, so that the problem that other electronic devices in the charging circuit are damaged due to overlarge voltage at the input end of the charging sub-circuit caused by the cutting-off action of the protection unit can be solved.

In one possible implementation of the first aspect, the bleeder sub-circuit may comprise a control unit and a bleeder unit. The control unit may be configured to control the discharge unit to discharge the input terminal of the charging sub-circuit when the voltage value of the input terminal of the charging sub-circuit is greater than or equal to a preset voltage value.

For example, the control unit may comprise a comparator, a first input of which may be coupled to an input of the charging subcircuit, and a second input of which may be adapted to receive the reference voltage. The comparator may be configured to output a bleed signal based on the voltage value at the input of the charging sub-circuit and a reference voltage value. For example, when the voltage value of the input end of the charging sub-circuit is greater than or equal to the voltage value of the reference voltage, the output end of the comparator outputs a bleeding signal to the bleeding unit, and the bleeding unit is controlled to discharge the input end of the charging sub-circuit.

In other examples, the first input of the comparator may also directly capture the voltage of the power supply interface, i.e., the first input of the comparator may be directly coupled to the power supply interface such that the comparator outputs a bleed signal to the bleed unit when the voltage value of the power supply interface is greater than or equal to the voltage value of the reference voltage.

At this time, if the voltage value of the reference voltage is equal to the voltage value of the preset voltage, the control unit outputs a release signal to control the release unit to discharge the input end of the charging sub-circuit while the protection unit cuts off the connection between the power supply interface and the battery when the voltage value of the input end of the charging sub-circuit is greater than the voltage value of the preset voltage.

If the voltage value of the reference voltage is greater than the voltage value of the preset voltage, the following situations exist: when the voltage value of the input end of the charging sub-circuit is larger than the voltage value of the preset voltage, after the protection unit cuts off the connection between the power supply interface and the battery, if the voltage of the input end of the charging sub-circuit is increased due to the cutting-off action of the protection unit, for example, the voltage is increased to be larger than the preset voltage value, the control unit outputs a release signal to control the release unit to discharge the input end of the charging sub-circuit; or after the protection unit cuts off the connection between the power supply interface and the battery, the voltage of the input end of the charging sub-circuit is not increased, the control unit does not output a release signal, and the release unit does not discharge the input end of the charging sub-circuit.

Therefore, the problem that the opening times of the discharge unit are too much and the service life of the discharge unit is reduced can be avoided while the problem that other electronic devices in the charging circuit are damaged due to the fact that the voltage of the input end of the charging sub-circuit is too large caused by the cutting-off action of the protection unit can be prevented by selecting proper reference voltage and preset voltage.

The control unit may be, for example, another functional device capable of outputting a signal according to the magnitude of the voltage value at the input end of the charging sub-circuit and the reference voltage value, for example, the control unit may be a micro-processing chip capable of outputting a signal according to the magnitude of the voltage value at the input end of the charging sub-circuit and the reference voltage value.

The bleed unit may be coupled to the control unit and the bleed unit may also be coupled to an input of the charging subcircuit. The bleed unit may be adapted to discharge the input of the charging sub-circuit under control of a bleed signal.

Illustratively, the bleed unit may include a transistor. A first pole of the transistor may be coupled to the input of the charging subcircuit, a second pole of the transistor may be coupled to the voltage bleeding terminal, and a control pole of the transistor may be used to receive the bleeding signal.

For example, the bleed signal may have a voltage that turns on the transistor, and the voltage value of the voltage provided by the voltage bleed terminal may be smaller than a preset voltage value. When the control electrode of the transistor receives the bleeder signal, the transistor is conducted to enable the input end of the charging sub-circuit to be coupled with the voltage bleeder end.

Thus, when the bleeder unit receives the bleeder signal, the input terminal of the charging sub-circuit can be discharged through the transistor and the voltage bleeder terminal.

In another possible implementation manner of the first aspect, the bleeder sub-circuit may further comprise a sampling unit, which may be coupled to the power supply interface, and which may be further coupled to the control unit. The sampling unit may be adapted to output a sampled voltage to the control unit in dependence of the voltage of the supply interface. The control unit controls the output of the bleed-off signal according to the sampled voltage, for example, when the sampled voltage indicates that the voltage value of the power supply interface is greater than or equal to a preset voltage value, the control unit outputs the bleed-off signal.

The sampling unit may comprise a voltage divider circuit built with resistors.

The sampling unit may include a first voltage dividing resistor and a second voltage dividing resistor. The first end of the first voltage dividing resistor may be coupled to the control unit, and the second end of the first voltage dividing resistor may be coupled to the power supply interface. The first terminal of the second voltage dividing resistor may be coupled to the second terminal of the first voltage dividing resistor, and the second terminal of the second voltage dividing resistor may be coupled to the voltage bleeding terminal.

In this way, the sampling unit can supply the sampling voltage, i.e., the voltage across the second voltage dividing resistor, to the control unit, and the sampling voltage supplied to the control unit can be adjusted by adjusting the ratio of the resistances of the first voltage dividing resistor and the second voltage dividing resistor.

The sampling unit may also include a functional device capable of outputting an input voltage at a preset ratio (amplification factor), such as a voltage follower, for example.

In another possible implementation manner of the first aspect, the charging circuit may further include a voltage limiting unit. The voltage limiting unit may be coupled to the power supply interface, and the voltage limiting unit may be configured to make a voltage value of the power supply interface smaller than a defined voltage value.

The voltage limiting unit may comprise a transient voltage suppressor, a first end of which is coupled to the power supply interface, and a second end of which is coupled to the voltage bleeding end.

In this way, when the voltage at the power supply interface is too large, the voltage provided by the power supply interface to the charging sub-circuit may be limited by the voltage limiting unit.

The voltage limiting unit may further include a zener diode, for example.

In another possible implementation manner of the first aspect, the charging circuit may further include a voltage stabilizing unit, which may be coupled to the input terminal of the charging sub-circuit, and the voltage stabilizing unit may be configured to stabilize a voltage of the input terminal of the charging sub-circuit.

Illustratively, the voltage stabilizing unit may include a voltage stabilizing capacitor, a first plate of the voltage stabilizing capacitor being coupled to the input of the charging subcircuit, and a second plate of the voltage stabilizing capacitor being coupled to the voltage bleeding terminal. The voltage discharging terminal may be configured to provide a stable voltage, and a voltage value of the voltage provided by the voltage discharging terminal may be smaller than a predetermined voltage value, for example, the voltage discharging terminal may be a ground terminal.

In this way, the second plate of the voltage stabilizing capacitor is coupled with the voltage discharging end for providing the stable voltage, so that the first plate of the voltage stabilizing capacitor can play a role in stabilizing the voltage of the input end of the second charging sub-circuit, and the voltage of the input end of the charging sub-circuit can be stabilized through the voltage stabilizing unit.

In another possible implementation manner of the first aspect, the charging sub-circuit may further include a voltage transforming unit, and the voltage transforming unit and the protection unit are connected in series between an input terminal of the charging sub-circuit and an output terminal of the charging sub-circuit. The voltage transformation unit may be used to generate a charging voltage from the voltage at the input of the charging sub-circuit and transmit it to the battery.

Illustratively, the voltage transforming unit may include one or more of a charge pump, a boost chopper circuit, a buck chopper circuit.

In this way, the charging voltage output from the charging sub-circuit to the battery can be adjusted by the voltage transformation unit. The transforming unit may supply the constant current to the battery through the charge pump, such as when the battery requires the constant current for charging. When the battery needs a constant voltage for charging, the constant voltage can be provided for the battery through a boost chopper circuit or a buck chopper circuit.

In a second aspect, an electronic device is provided.

The electronic device may comprise a battery and a charging circuit in any implementation of the first aspect. The charging circuit may be coupled with a battery.

Since the electronic device comprises the charging circuit in any implementation manner of the first aspect, the electronic device may have the beneficial effects of the charging circuit in any implementation manner of the first aspect.

In one possible implementation manner of the second aspect, the charging sub-circuit may include a first charging sub-circuit and a second charging sub-circuit. The electronic device may further include a first circuit board and a second circuit board.

For example, the power supply interface and the first charging sub-circuit may be located on a first circuit board, an input of the first charging sub-circuit may be coupled with the power supply interface, an output of the first charging sub-circuit may be coupled with the battery, and the first charging sub-circuit may be used to provide a first charging loop for the battery.

For example, a second charging sub-circuit may be located on the second circuit board, an input of the second charging sub-circuit may be coupled to the power supply interface through a jumper wire, an output of the second charging sub-circuit may be coupled to the battery, and the second charging sub-circuit may be used to provide a second charging loop for the battery.

Thus, where the magnitude of the current charging the battery is unchanged, the value of the current on each charging loop in the handset of this example will be less than the value of the current on the charging loop in a handset having only one charging loop when charging the battery. And because the two charging loops can be located on different circuit boards respectively, the heat on each circuit board of the mobile phone in the example is smaller than the heat on the circuit board in the mobile phone with only one charging loop under the condition that the magnitude of the current for charging the battery is unchanged.

In another possible implementation manner of the second aspect, the bleeder circuit may be located on the second circuit board.

Because the first charging sub-circuit and the power supply interface are both positioned on the first circuit board, the distance of the wiring between the first charging sub-circuit and the power supply interface is short, and therefore, the inductance value of the parasitic inductance of the wiring between the first charging sub-circuit and the power supply interface is low, and when the protection unit in the first charging sub-circuit enables the first charging sub-circuit to be disconnected, the peak voltage generated by the parasitic inductance of the wiring between the first charging sub-circuit and the power supply interface is low.

The second charging sub-circuit is located on the second circuit board, and the second charging sub-circuit and the power supply interface are required to be coupled through the jumper wire, so that the distance between the second charging sub-circuit and the power supply interface is longer, the parasitic inductance of the wire between the second charging sub-circuit and the power supply interface is larger, and therefore, when the protection unit in the second charging sub-circuit enables the second charging sub-circuit to be disconnected, the peak voltage generated by the parasitic inductance of the wire between the second charging sub-circuit and the power supply interface is higher.

Therefore, the bleeder circuit is arranged on the second circuit board and can be closer to the second charging sub-circuit, so that the voltage of the input end of the second charging sub-circuit can be better bleeder.

In another possible implementation manner of the second aspect, the electronic device further includes a reference voltage source and a processing chip. The reference voltage source is coupled to the bleeder sub-circuit and is configured to provide a reference voltage to the bleeder sub-circuit. The processing chip is coupled with the reference voltage source and is used for adjusting the voltage value of the reference voltage according to the preset voltage value and controlling the voltage value of the reference voltage to be larger than or equal to the preset voltage value. When the voltage of the input end of the charging sub-circuit is larger than or equal to the voltage value of the reference voltage, the discharging sub-circuit discharges the input end of the charging sub-circuit.

Therefore, the voltage value of the reference voltage can be adjusted through the processing chip, so that the voltage value of the reference voltage is always matched with the preset voltage of the corresponding protection unit.

In another possible implementation manner of the second aspect, the reference voltage source includes a power supply and a buck-boost circuit. The power supply is used for providing a power supply voltage. The step-up and step-down circuit is coupled with the power supply, the step-up and step-down circuit is further coupled with the processing chip, and the step-up and step-down circuit is used for outputting reference voltage according to the power supply voltage under the control of the processing chip.

In a third aspect, a charge control method is also provided. The charging control method is applied to the charging circuit.

The charging circuit is used for charging the battery. The charging circuit comprises a power supply interface, a charging sub-circuit and a discharging sub-circuit; the input end of the charging sub-circuit is coupled with the power supply interface, the output end of the charging sub-circuit is coupled with the battery, and the charging sub-circuit comprises a protection unit; the bleeder sub-circuit is coupled to an input of the charging sub-circuit.

The control method comprises the following steps: when the voltage value of the input end of the charging sub-circuit is larger than or equal to a preset voltage value, the protection unit controls the power supply interface to be disconnected from the battery, and the discharging sub-circuit discharges the input end of the charging sub-circuit.

Thus, when the charging circuit applies the control method to charge the battery, the problem that the battery is damaged due to the fact that the voltage provided by the power supply interface to the battery is too large can be prevented. And when the protection unit cuts off the connection between the power supply interface and the battery, the charging circuit can discharge the input end of the charging sub-circuit, so that the problem that other electronic devices in the charging circuit are damaged due to overlarge voltage at the input end of the charging sub-circuit caused by the cutting-off action of the protection unit can be solved.

In a possible implementation manner of the third aspect, the bleeder sub-circuit comprises a comparator and a bleeder unit; the first input end of the comparator is coupled with the power supply interface, and the second input end of the comparator is used for receiving the reference voltage; the bleeder unit is coupled with the output end of the comparator, and the bleeder unit is also coupled with the input end and the voltage bleeder end of the charging sub-circuit respectively; the voltage value of the reference voltage is larger than or equal to the voltage value of the preset voltage, the voltage value of the voltage provided by the voltage discharging end is smaller than the preset voltage value, and the voltage value of the reference voltage is larger than or equal to the voltage value of the preset voltage; the control method comprises the following steps: when the voltage value of the power supply interface is larger than or equal to the voltage value of the reference voltage, the output end of the comparator outputs a release signal to the release unit, and the release unit is controlled to be communicated with the input end of the charging sub-circuit and the voltage release end so as to discharge the input end of the charging sub-circuit.

Drawings

FIG. 1 is a schematic diagram of an electronic device assembly according to some embodiments of the present application;

FIG. 2 is a schematic diagram of a Type-C interface;

FIG. 3 is a schematic diagram of another configuration of an electronic device assembly according to some embodiments of the present application;

fig. 4 is a schematic structural diagram of a mobile phone according to some embodiments of the present application;

FIG. 5 is a schematic diagram of a structure of the mobile phone shown in FIG. 4;

FIG. 6 is a schematic diagram of another structure of the mobile phone shown in FIG. 4;

Fig. 7 is a schematic diagram of an actual voltage input to a power supply interface by a data line, an actual voltage at a point a, and an actual voltage at a point B when a power supply voltage in the mobile phone shown in fig. 6 is in a surge;

FIG. 8 is a schematic diagram illustrating a second charging sub-circuit of the mobile phone shown in FIG. 6;

FIG. 9 is a schematic diagram showing the voltage variation at points A and B in FIG. 8;

Fig. 10 is a schematic structural diagram of a mobile phone according to some embodiments of the present application;

fig. 11 is a schematic structural diagram of a mobile phone according to some embodiments of the present application;

FIG. 12 is a schematic diagram of a structure of the mobile phone shown in FIG. 11;

FIG. 13 is a schematic diagram of another structure of the mobile phone shown in FIG. 11;

fig. 14 is a schematic structural diagram of a mobile phone according to some embodiments of the present application;

FIG. 15 is a schematic diagram of a structure of the mobile phone shown in FIG. 14;

fig. 16 is a schematic structural diagram of a mobile phone according to some embodiments of the present application;

FIG. 17 is a schematic diagram of a structure of the mobile phone shown in FIG. 16;

FIG. 18 is a schematic diagram illustrating a second charging sub-circuit of the mobile phone of FIG. 17;

FIG. 19 is a schematic diagram showing the voltage variation at points A and B in FIG. 18;

Fig. 20 is a schematic structural diagram of a mobile phone according to some embodiments of the present application.

Detailed Description

The following description of the technical solutions according to the embodiments of the present application will be given with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments.

Hereinafter, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.

Furthermore, in the present application, directional terms "upper", "lower", "left", "right" and the like may be defined with reference to an orientation in which components are schematically disposed in the drawings, and it should be understood that these directional terms may be relative concepts, which are used for the description and clarity with respect thereto, and which may be correspondingly varied according to the variation in the orientation in which components are disposed in the drawings.

In the present application, unless explicitly specified and limited otherwise, the term "connected" is to be construed broadly, and for example, "connected" may be either fixedly connected, detachably connected, or integrally formed; can be directly connected or indirectly connected through an intermediate medium. Furthermore, the term "coupled" may be a means of electrical connection for achieving signal transmission.

In the present application, the control of each transistor is the gate of the transistor, one of the source and the drain of the first transistor, and the other of the source and the drain of the transistor. Since the source and drain of a transistor may be symmetrical in structure, the source and drain thereof may be indistinguishable in structure, that is, the first and second poles of the transistor in embodiments of the present disclosure may be indistinguishable in structure. Illustratively, in the case where the transistor is a P-type transistor, the first pole of the transistor is the source and the second pole is the drain; illustratively, in the case where the transistor is an N-type transistor, the first pole of the transistor is the drain and the second pole is the source.

As used herein, "about," "approximately" or "approximately" includes the stated values as well as average values within an acceptable deviation range of the particular values as determined by one of ordinary skill in the art in view of the measurement in question and the errors associated with the measurement of the particular quantity (i.e., limitations of the measurement system).

In embodiments of the application, words such as "exemplary" or "such as" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "for example" is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.

In order to improve the safety of the electronic equipment, a part of the electronic equipment is provided with a protection circuit, and the protection circuit can cut off the connection (short for a charging loop) between a power supply interface and a battery of the electronic equipment when the charging voltage of the electronic equipment is too high (reaching the turn-off voltage of the protection equipment).

However, the protection circuit is liable to cause damage to other electronic devices in the electronic apparatus when the charging circuit of the electronic apparatus is cut off. For example, if the parasitic inductance is present in the charging circuit, the current in the charging circuit should be originally reduced rapidly when the protection circuit cuts off the charging circuit of the electronic device, but since the parasitic inductance has an effect of preventing abrupt change of the current at both ends, in this case, the parasitic inductance is close to one end of the circuit break, and a spike voltage is instantaneously generated. The spike voltage may be greater than the highest withstand voltage of a portion of the electronics within the electronic device, thereby easily causing damage to other electronics within the electronic device. As follows, embodiments of a charging circuit, an electronic device assembly, and a charging control method are provided to illustrate the above technical problems, but it should be noted that these embodiments are for better illustrating the above technical problems, and are not intended to replace the electronic device assembly in these embodiments.

The embodiment of the application provides a charging circuit, electronic equipment, an electronic equipment assembly and a charging control method, which are used for solving the problem that other electronic devices in the electronic equipment are easy to damage when a charging circuit of the electronic equipment is cut off by a protection circuit.

The electronic device component may include a charger, a data line, and an electronic device. The charger may be coupled to a power terminal, such as a charger coupled to a socket that provides ac power. The charger may have a function of converting alternating current into direct current. Illustratively, the charger may convert 220V ac power to a dc voltage of 5V, 10V, 20V, etc. It should be noted that the above examples are merely illustrative for better explaining the functions of the charger, and should not be construed as limiting the charger provided by the present embodiment.

The data line can transmit the direct-current voltage output by the charger to the electronic equipment, and the data line can be connected with external data processing equipment to transmit data for the electronic equipment. Illustratively, the data line may include a connector having a universal serial bus (universal serial bus, USB).

The electronic device may include, but is not limited to, a portable electronic device with charging capabilities, such as a mobile power supply, a laptop computer, a mobile phone, a smart phone, a tablet computer, a smart car device, a navigator, a motion camera, an artificial intelligence device, a wearable device, or a virtual reality/augmented reality/mixed reality device, etc. The electronic equipment can also be electronic products such as a rechargeable electric automobile, a rechargeable household appliance (such as a soymilk machine, a sweeping robot and the like), an unmanned aerial vehicle and the like. For ease of understanding, the following description will take a scenario in which the electronic device includes a mobile phone as an example.

Fig. 1 is a schematic structural diagram of an electronic device assembly according to some embodiments of the present application.

As shown in fig. 1, the mobile phone 1 may include an external interface, a processing chip, a charging circuit 100, and a battery 20. One end of the data line 3 may be coupled to the charger 2, and the other end of the data line 3 may be coupled to an external interface of the mobile phone 1. The external interface may include an interface with a universal serial bus. The pins in the external interface can be coupled with the processing chip in the mobile phone 1 through the signal wires in the mobile phone 1 so as to realize the functions of data exchange and the like of the mobile phone 1. The pins in the external interface can be coupled with the battery 20 in the mobile phone 1 through the charging circuit 100, so that the functions of quick charging and the like of the mobile phone 1 are realized. For ease of understanding, the following description will be given taking the external interface as a Type-C port and the processing chip as a System On Chip (SOC) as an example, but this should not be construed as limiting the external port and the processing chip.

Fig. 2 is a schematic structural diagram of a Type-C interface.

As shown in fig. 2, the a-side and the B-side of the Type-C interface each include 12 pins. Illustratively, the Type-C interface includes at least two VBUS pins (for providing a supply voltage, pin 4 and pin 9) symmetrically arranged, a channel configuration (channel configuration, CC) pin (for detecting connector orientation, determining external device Type, pin 5, with a face labeled CC1, B face labeled CC 2), d+ pin (pin 6), D-pin (pin 7), SBU pin (pin 8 is a spare pin, with a face labeled SBU1, B face labeled SBU 2), tx+ pin (pin 2, with a face labeled TX1+, B face labeled TX 2+), TX-pin (pin 3, with a face labeled TX1-, B face labeled TX 2+), rx+ (pin 11, with a face labeled RX2+, B face labeled RX 1+), RX- (pin 10, with a face labeled RX2-, B face labeled RX 1-), and GND (for providing a ground signal, pins 1 and 12).

Illustratively, a VBUS pin in the Type-C interface that provides a supply voltage may belong to the charging circuit 100, hereinafter referred to as the supply interface.

Fig. 3 is a schematic structural diagram of the electronic device assembly shown in fig. 1.

As shown in fig. 3, in some implementations, the charging circuit 100 may include a power interface 130 (VBUS pin), a charging subcircuit 120, and a circuit board. The power supply interface 130 and the charging sub-circuit 120 may be disposed on a circuit board, an input terminal of the charging sub-circuit 120 may be coupled to the power supply interface 130, an output terminal of the charging sub-circuit 120 may be coupled to the battery 20, and the charging sub-circuit 120 may be capable of transmitting power provided by the power supply interface 130 to the battery 20, thereby charging the battery 20.

Fig. 4 is a schematic structural diagram of a mobile phone 1 according to some embodiments of the present application.

As shown in fig. 4, in some embodiments, the circuit boards may include a first circuit board 11 and a second circuit board 12. The charging sub-circuit 120 may include a first charging sub-circuit 1201 and a second charging sub-circuit 1202. It should be noted that the present application is not limited to the number of circuit boards and charging sub-circuits 120, and the charging circuit 100 may also have only one circuit board, and one or more charging sub-circuits 120 may be disposed on one circuit board.

The power interface 130 and the first charging subcircuit 1201 may be located on the first circuit board 11. An input of the first charging subcircuit 1201 may be coupled to the power supply interface 130, and an output of the first charging subcircuit 1201 may be coupled to the battery 20. The first charging subcircuit 1201 may be used to provide a first charging loop for the battery 20.

The second charging subcircuit 1202 may be located on the second circuit board 12. An input of the second charging subcircuit 1202 may be coupled to the power supply interface 130 through the flying lead 141, and an output of the second charging subcircuit 1202 may be coupled to the battery 20. The second charging subcircuit 1202 may be configured to provide a second charging loop for the battery 20.

Thus, the handset 1 may have two parallel charging loops for charging the battery 20, so that in this example the handset 1 would have a smaller value of current on each charging loop when charging the battery 20 than in a handset having only one charging loop, with the magnitude of the current charging the battery 20 unchanged. And since the two charging loops may be located on different circuit boards, respectively, the heat on each circuit board of the handset 1 in this example will be less than the heat on the circuit board in a handset having only one charging loop, with the magnitude of the current charging the battery 20 unchanged.

In summary, the mobile phone 1 in this example can better avoid the problem of the reduced efficiency of charging the battery 20 by the charging circuit due to the over-high temperature compared to the mobile phone having only one charging circuit.

Illustratively, the jumper wires 141 may be flexible circuit boards (flexible printed circuit, FPCs), or other wires that can carry electrical current.

In some embodiments, the charging sub-circuit 120 may include a protection unit that may be used to prevent the voltage provided by the charging sub-circuit 120 when charging the battery 20 from becoming excessive. In other embodiments, while part of the charging circuit 100 includes a protection unit, other parts of the charging circuit 100 may not be provided with a protection unit.

The protection unit is connected in series between the input end of the charging sub-circuit 120 and the output end of the charging sub-circuit 120, and when the voltage value of the voltage at the input end of the charging sub-circuit 120 is greater than or equal to the voltage value of the preset voltage (hereinafter simply referred to as the preset voltage value), the protection unit controls the charging sub-circuit 120 to be in an open state, so that the battery 20 cannot be charged through the charging sub-circuit 120, and the problem that the battery 20 is damaged due to overlarge voltage provided by the charging sub-circuit 120 to the battery 20 is avoided.

The protection unit may be, for example, an overvoltage protection chip (over voltage protection, OVP) integrated with an overvoltage protection function, or may be other protection devices capable of breaking the charging sub-circuit 120 when the voltage value at the input terminal of the charging sub-circuit 120 is too large, which is not limited by the present application. For example, the protection unit may include a first transistor and a second transistor, where a first end of the first transistor is coupled to an input terminal of the charging sub-circuit 120, a second end of the first transistor is coupled to a first end of the second transistor, a second end of the second transistor is coupled to an output terminal of the charging sub-circuit 120, and a control terminal of the first transistor and a control terminal of the second transistor are configured to receive a control signal output by a control module in the protection unit. When the voltage value of the input end of the charging sub-circuit 120 is greater than or equal to the preset voltage value, the control module in the protection unit outputs a turn-off signal to the control end of the first transistor and the control end of the second transistor, so that the first transistor and the second transistor are turned off, and the connection between the input end of the corresponding charging sub-circuit 120 and the output end of the charging sub-circuit 120 is disconnected.

For example, the preset voltage value may be a voltage value of a turn-off voltage of the overvoltage protection chip, that is, when the voltage value of the input terminal of the charging sub-circuit 120 is greater than or equal to the preset voltage value, the overvoltage protection chip is turned off, so that the charging sub-circuit 120 is in an open state, and the coupling between the battery 20 and the power supply interface 130 is disconnected.

The charging circuit 100 provided in the above embodiment can prevent the battery 20 from being damaged due to the excessive voltage provided by the power supply interface 130 to the battery 20 by the protection unit when the voltage value of the input end of the charging sub-circuit 120 is greater than or equal to the preset voltage value, and the charging sub-circuit 120 is in the open state.

Fig. 5 is a schematic structural diagram of the mobile phone 1 shown in fig. 4.

For example, as shown in fig. 5, the first charging sub-circuit 1201 may include a first protection unit 1211. The first protection unit 1211 is coupled to the power supply interface 130. The first protection unit 1211 is configured to put the first charging sub-circuit 1201 in an open state when the voltage of the input terminal of the first charging sub-circuit 1201 is too high.

The second charging sub-circuit 1202 may include a second protection unit 1212. The second protection unit 1212 is coupled to the power supply interface 130, and the second protection unit 1212 may be configured to put the second charging sub-circuit 1202 in an open state when the voltage at the input of the second charging sub-circuit 1202 is too high.

In some embodiments, the charging sub-circuit 120 may further include a transforming unit, which may be connected in series with the protection unit between an input terminal of the charging sub-circuit 120 and an output terminal of the charging sub-circuit 120. The transformation unit may be used to generate a charging voltage from the voltage at the input of the charging sub-circuit 120 and transmit it to the battery 20.

In this way, the charging voltage and/or the charging current output by the charging electronic circuit 120 to the battery 20 may be adjusted by the voltage transformation unit. The transforming unit may provide a constant current to the battery 20 through a charge pump, such as when the battery 20 requires a constant current for charging. When the battery 20 needs a constant voltage for charging, the constant voltage may be supplied to the battery 20 through a step-up chopper circuit or a step-down chopper circuit.

Fig. 6 is a schematic diagram of another structure of the mobile phone 1 shown in fig. 4.

Illustratively, as shown in fig. 6, the first charging sub-circuit 1201 may include a first transforming unit 1221. The first transforming unit 1221 may be coupled with the first protection unit 1211, and the first transforming unit 1221 may be further coupled with the battery 20. The first transforming unit 1221 may be used to generate a suitable charging voltage from the voltage at the input of the first charging sub-circuit 1201 and transmit it to the battery 20.

The second charging sub-circuit 1202 may include a second transformation unit 1222 and a third transformation unit 1223. The second voltage transforming unit 1222 and the third voltage transforming unit 1223 may be connected in parallel between the second protection unit 1212 and the battery 20. The second voltage transforming unit 1222 may provide a constant charging current to the battery 20 when the battery 20 requires a constant current. The third transforming unit 1223 may provide a constant charging voltage for the battery 20 when the battery 20 requires a constant voltage.

In this way, the second charging sub-circuit 1202 may provide the battery 20 with an appropriate charging voltage and/or charging current according to the different charging phases of the battery 20.

Illustratively, the second voltage transforming unit 1222 may be a charge pump, and the third voltage transforming unit 1223 may be a step-down chopper circuit.

As shown in fig. 6, in some embodiments, the charging circuit 100 may further include a voltage limiting unit 160. The voltage limiting unit 160 may be coupled to the power supply interface 130, and the voltage limiting unit 160 may be used to make the voltage value of the power supply interface 130 smaller than the defined voltage value.

The limited voltage value may be equal to or greater than the preset voltage value, but it should be noted that, since the maximum voltage allowed in the mobile phone 1 is generally required to be less than the maximum withstand voltage of the electronic devices in the mobile phone 1, the limited voltage value is required to be less than the maximum withstand voltage of the electronic devices in the mobile phone 1 when the limited voltage value is greater than the preset voltage value.

For example, the voltage limiting unit 160 may include a transient voltage suppressor TVS having a first end coupled to the power supply interface 130 and a second end coupled to the voltage bleeding end. The voltage discharging terminal may be configured to provide a stable voltage, and a voltage value of the voltage provided by the voltage discharging terminal may be smaller than a predetermined voltage value, for example, the voltage discharging terminal may be a ground terminal. In this way, when the voltage at the power supply interface 130 is excessively large, the voltage of the power supply interface 130 may be limited by the voltage limiting unit 160.

As shown in fig. 6, in other embodiments, the charging circuit 100 may further include a voltage stabilizing unit 150, where the voltage stabilizing unit 150 may be coupled to the input terminal of the second charging sub-circuit 1202, and the voltage stabilizing unit 150 may be configured to stabilize the voltage of the input terminal of the second charging sub-circuit 1202.

Illustratively, the voltage stabilizing unit 150 may include a voltage stabilizing capacitor C. A first plate of the regulated capacitor C may be coupled to the input of the second charging subcircuit 1202 and a second plate of the regulated capacitor C may be coupled to the voltage bleeding terminal. Since the second plate of the stabilizing capacitor C is coupled to the voltage discharging terminal that provides the stabilizing voltage, the first plate of the stabilizing capacitor C can function to stabilize the voltage of the input terminal of the second charging sub-circuit 1202.

In this way, the voltage at the input of the second charging sub-circuit 1202 can be regulated by the voltage regulating unit 150. Illustratively, the stabilizing capacitor C may be located on the first circuit board 11 in fig. 4, or the stabilizing capacitor C may be located on the second circuit board 12 in fig. 4.

In the above embodiment, since the second charging sub-circuit 1202 is located on the second circuit board 12, the second charging sub-circuit 1202 and the power supply interface 130 need to be coupled through the jumper wire 141, and the distance between the second charging sub-circuit 1202 and the power supply interface 130 is longer than the distance between the first charging sub-circuit 1201 and the power supply interface 130. Accordingly, the parasitic inductance on the trace between the second charging subcircuit 1202 and the power supply interface 130 is greater than the parasitic inductance on the trace between the first charging subcircuit 1201 and the power supply interface 130.

When the power supply voltage supplied to the power supply interface 130 by the data line 3 is surmounted, the voltages of the power supply interface 130 and the input terminals of the second charging sub-circuit 1202 rise rapidly. When the voltage at the input end of the second charging sub-circuit 1202 rises to the turn-off voltage of the second protection unit 1212 (the preset voltage of the second charging sub-circuit 1202), the second protection unit 1212 turns off the second charging sub-circuit 1202, and the current on the second charging sub-circuit 1202 decreases sharply in a short time, because the trace between the second charging sub-circuit 1202 and the power supply interface 130 has a larger parasitic inductance, and under the effect that the current cannot be suddenly changed at both ends of the parasitic voltage, the parasitic inductance approaches to the open circuit (point B in fig. 6) to generate a spike voltage.

Fig. 7 is a schematic diagram of the actual voltage input to the power supply interface 130 by the data line 3, the actual voltage at the point a, and the actual voltage at the point B when the power supply voltage of the mobile phone 1 shown in fig. 6 is in surge.

As shown in fig. 7, when a surge occurs, the voltage input to the power supply interface 130 by the data line 3 rapidly rises from 20V to 32.4V or more; the voltage of the supply interface 130 (point a) is limited to 32.4V due to the clamping action of the TVS, i.e., the clamping voltage of the TVS is about 32.4V; the voltage at the input (point B) of the second charging subcircuit 1202 rises to 49.2V due to parasitic inductance, i.e., point B produces a spike voltage.

Fig. 8 is a schematic diagram illustrating a simulation of the operation of the second charging sub-circuit 1202 of the mobile phone 1 shown in fig. 6.

In fig. 8, a first voltage source V1 is used to simulate the voltage output after the integration of the power supply interface 130 and the transient voltage suppressor TVS. When the power supply interface 130 has no surge voltage, the voltage of the first voltage source V1 is the voltage output by the power supply interface 130; when the surge voltage exists in the power supply interface 130, the voltage of the first voltage source V1 is a clamping voltage after the transient voltage suppressor TVS limits the surge voltage. The inductance L1 is used to simulate a parasitic inductance on the flying board wire 141, the capacitance C1 is used to simulate a capacitance (which may include a parasitic capacitance and/or a regulated capacitance C) in the charging circuit 100, the third resistance R3 is used to simulate a parasitic resistance on the flying board wire 141, the first transistor T1 and the second transistor T2 are used to simulate transistors in the second protection unit 1212, the second voltage source V2 is used to simulate an off voltage provided to the first transistor T1 and the second transistor T2 in the second protection unit 1212 when a surge occurs, and the fourth resistance R4 is used to simulate an equivalent impedance in a subsequent circuit of the second protection unit 1212.

To simulate the change of the supply voltage when the surge occurs, the low level of the supply voltage provided by the first voltage source V1 is 20V, the high level is 34V, and the high level duration may be 20us. The low level is used for the level when the equivalent power supply voltage is not in surge, and the high level is used for the level when the equivalent power supply voltage is in surge.

In order to simulate the operation of the second protection unit 1212 to turn off the first transistor T1 and the second transistor T2 in time when the surge occurs (when the voltage at the input terminal of the second charging sub-circuit 1202 reaches the preset voltage, for example, when the voltage at the input terminal is 22V), the second voltage source V2 provides the turn-off voltage to the first transistor T1 and the second transistor T2 when the power supply voltage is switched from the low level to the high level, that is, when the power supply voltage rises (at 12 us), for example, provides the turn-off voltage with a voltage value of 28V.

Fig. 9 is a schematic diagram of voltage change at points a and B in fig. 8.

As shown in fig. 9, when the first voltage source V1 outputs a high level signal to simulate the surge, the voltage at the point a is 34V; the current in the second charging sub-circuit 1202 changes rapidly in a short time due to the turn-off of the first transistor T1 and the second transistor T2 in the second protection unit 1212, and the voltage at the point B rises to 42V at most due to the parasitic inductance, which is far greater than the preset voltage, i.e. the spike voltage is generated.

In order to prevent the problem that the voltage spikes generated at the input of the charging sub-circuit 120 cause damage to other electronic devices in the mobile phone 1 when the protection unit cuts off the connection between the power supply interface 130 and the battery 20, a subsequent embodiment of the present application provides a mobile phone 1, the mobile phone 1 having a discharging sub-circuit capable of discharging the input of the charging sub-circuit 120.

Fig. 10 is a schematic structural diagram of a mobile phone 1 according to some embodiments of the present application.

As shown in fig. 10, the mobile phone 1 in this embodiment further includes a bleeder circuit 110. The bleeder subcircuit 110 may be coupled with the power supply interface 130, and the bleeder subcircuit 110 may also be coupled with an input of the charging subcircuit 120 with a protection unit. The bleeder sub-circuit 110 may be configured to discharge electrical energy from the input of the charging sub-circuit 120 when the voltage value of the voltage at the input of the charging sub-circuit 120 is greater than or equal to a certain value.

In this way, when the charging circuit 100 charges the battery 20, if the voltage value of the voltage at the input terminal of the charging sub-circuit 120 is greater than or equal to the preset voltage value, the coupling between the power supply interface 130 and the battery 20 may be cut off by the protection unit, and at the same time, the charging circuit 100 may also discharge the input terminal of the charging sub-circuit 120 through the discharging sub-circuit 110.

Accordingly, the charge control method applied to the charging circuit 100 may include step 100.

In step 100, when the voltage value of the input end of the charging sub-circuit 120 is greater than or equal to the preset voltage value, the protection unit controls the power supply interface 130 to open circuit between the battery and the discharging sub-circuit 110 discharges the input end of the charging sub-circuit.

Since the first charging sub-circuit 1201 and the power supply interface 130 are both located on the first circuit board 11, the distance of the trace between the first charging sub-circuit 1201 and the power supply interface 130 is short, and thus the inductance of the parasitic inductance of the trace between the first charging sub-circuit 1201 and the power supply interface 130 is low, and thus, when the first protection unit 1211 in the first charging sub-circuit 1201 turns off the first charging sub-circuit 1201, the peak voltage generated by the parasitic inductance of the trace between the first charging sub-circuit 1201 and the power supply interface 130 is low.

The second charging sub-circuit 1202 is disposed on the second circuit board 12, and the second charging sub-circuit 1202 and the power supply interface 130 are coupled through the jumper wire 141, so that the distance between the second charging sub-circuit 1202 and the power supply interface 130 is longer, and the parasitic inductance of the wire between the second charging sub-circuit 1202 and the power supply interface 130 is larger, so that when the second protection unit 1212 in the second charging sub-circuit 1202 turns off the second charging sub-circuit 1202, the peak voltage generated by the parasitic inductance of the wire between the second charging sub-circuit 1202 and the power supply interface 130 is higher. Accordingly, the discharging sub-circuit 110 will be described later for discharging the input of the second charging sub-circuit 1202.

As shown in fig. 10, the bleeder circuit 110 may be disposed on the second circuit board 12, and when the voltage value of the voltage at the input end of the second charging sub-circuit 1202 is greater than or equal to a certain value, the bleeder circuit 110 discharges the input end of the second charging sub-circuit 1202, i.e. the input end of the second protection unit 1212, so as to prevent the problem that the spike voltage at the input end of the second protection unit 1212 causes damage to the electronic devices in the mobile phone 1.

Since the bleeder circuit 110 is disposed on the second circuit board 12, the bleeder circuit 110 may be closer to the second charging circuit 1202, and thus may better bleed the voltage at the input of the second charging circuit 1202.

In other examples, the bleeder subcircuit 110 may also be located on the first circuit board 11 and discharge the input of the first charging subcircuit 1201. The present application is not limited to the positional relationship between the bleeder circuit 110 and the charging circuit 120 that needs to be discharged, for example, the bleeder circuit 110 may be used to discharge the first charging circuit 1201 but located on the second circuit board 12, or the bleeder circuit 110 may be used to discharge the second charging circuit 1202 but located on the first circuit board 11.

Fig. 11 is a schematic structural diagram of a mobile phone 1 according to some embodiments of the present application, and fig. 12 is a schematic structural diagram of the mobile phone 1 shown in fig. 11.

In some embodiments, as shown in fig. 11, the bleeder sub-circuit 110 may include a control unit 111 and a bleeder unit 112.

The control unit 111 may be coupled to the power supply interface 130, and the control unit 111 may be configured to output a bleed signal when a voltage value of a voltage of the power supply interface 130 is greater than or equal to a preset voltage value.

It should be noted that, since the voltage of the charging circuit 100 is provided by the power supply interface 130, when the voltage at the power supply interface 130 is greater than the preset voltage, the voltage at the input terminal of the second charging sub-circuit 1202 will also rise to be greater than the preset voltage, so that the timing of discharging the input terminal of the second charging sub-circuit 1202 by the discharging sub-circuit 110 can be determined by the voltage at the power supply interface 130.

The bleed unit 112 may be coupled to the control unit 111, and the bleed unit 112 may also be coupled to an input of the second charging subcircuit 1202. Bleed unit 112 may discharge the input of second charge subcircuit 1202 upon receiving a bleed signal that controls the output of bleed unit 112.

For example, as shown in fig. 12, the control unit 111 may include a comparator U1, a first input terminal of the comparator U1 may be coupled with the power supply interface 130, and a second input terminal of the comparator U1 may be used to receive the reference voltage. The voltage value of the reference voltage may be greater than or equal to a preset voltage value, but less than or equal to a defined voltage value. The reference voltage may be provided by a reference voltage source, i.e. the second input of the comparator U1 may be coupled to the reference voltage source.

The comparator U1 may be used to output a bleed signal according to the voltage value of the voltage of the power supply interface 130 and the voltage value of the reference voltage. If the voltage value of the voltage of the power supply interface 130 is greater than or equal to the voltage value of the reference voltage, the output terminal of the comparator U1 outputs a bleed signal to the bleed unit 112, and controls the bleed unit 112 to discharge the input terminal of the second charging sub-circuit 1202.

Of course, the control unit 111 may also be other functional devices capable of outputting corresponding control signals according to the voltage value of the charging interface 130 and the magnitude of the reference voltage value, for example, the control unit 111 may be a micro-processing chip (micro control unit, MCU) capable of outputting control signals according to the voltage value of the input terminal of the second charging sub-circuit 1202 and the magnitude of the reference voltage value. The control unit 111 including the comparator U1 will be described later as an example.

When the control unit 111 includes the comparator U1, the above-described step 100 may include step 101.

In step 101, when the voltage value of the power supply interface 130 is greater than or equal to the voltage value of the reference voltage, the output terminal of the comparator U1 outputs a bleed signal to the bleed unit 112, and the bleed unit 112 is controlled to communicate the input terminal of the second charging sub-circuit 1202 with the voltage bleed terminal, so as to discharge the input terminal of the second charging sub-circuit 1202.

In other examples, the bleeder subcircuit 110 may also select the timing of discharging the input of the second charging subcircuit 1202 based on the voltage value of the voltage at the input of the second charging subcircuit 1202. For example, the first input of the comparator U1 may also directly capture the voltage of the input of the second charging sub-circuit 1202, i.e., the first input of the comparator U1 is directly coupled to the input of the second charging sub-circuit 1202 (not shown).

In this way, when the voltage value of the input terminal of the second charging sub-circuit 1202 is greater than or equal to the voltage value of the reference voltage, the comparator U1 outputs a bleeding signal to the bleeding unit 112, discharging the input terminal of the second charging sub-circuit 1202.

It should be noted that, when the first input terminal of the comparator U1 directly collects the voltage of the input terminal of the second charging sub-circuit 1202 and the voltage value of the reference voltage is set to be greater than the preset voltage value, if the second protection unit 1212 cuts off the connection between the input terminal of the second charging sub-circuit 1202 and the output terminal of the second charging sub-circuit 1202, the voltage of the input terminal of the second charging sub-circuit 1202 increases (generates a spike voltage) due to the cutting-off action of the second protection unit 1212, for example, when the voltage increases to a voltage value greater than or equal to the reference voltage, the control unit 111 outputs the bleeding signal to control the bleeding unit 112 to discharge the input terminal of the second charging sub-circuit 1202; however, if the voltage value of the input terminal of the second charging sub-circuit 1202 does not rise to a voltage value greater than or equal to the reference voltage after the second protection unit 1212 cuts off the connection between the input terminal of the second charging sub-circuit 1202 and the output terminal of the second charging sub-circuit 1202, the control unit 111 does not output the bleeding signal, and the bleeding unit 112 does not discharge the input terminal of the second charging sub-circuit 1202.

Therefore, by selecting the appropriate voltage value of the reference voltage and the preset voltage value, the problem of damage to the electronic devices in the charging circuit 100 caused by the excessive voltage at the input end of the second charging sub-circuit 1202 due to the cutting-off action of the second protection unit 1212 can be prevented, and the problem of reduction in the service life of the discharge unit 112 caused by excessive opening times of the discharge unit 112 can be avoided.

It should be noted that, in the following embodiments, the comparator U1 outputs the bleed signal according to the voltage value of the voltage of the power supply interface 130 and the voltage value of the reference voltage, but the present application is not limited to the sampling point of the control unit 111, and those skilled in the art can adapt the sampling point as required when the sampling point is changed from the power supply interface 130 to the input terminal of the second charging sub-circuit 1202.

As shown in fig. 13, bleed unit 112 may include a transistor M1. A first pole of the transistor M1 may be coupled to the input of the second charging subcircuit 1202, a second pole of the transistor M1 may be coupled to a voltage bleeding terminal, and a control pole of the transistor M1 may be used to receive the bleeding signal.

Illustratively, the bleed signal may have a voltage that turns on transistor M1. When the transistor is an N-type transistor, the drain signal is a high-level signal that can turn on the transistor M1, and when the transistor is a P-type transistor, the drain signal is a low-level signal that can turn on the transistor M1.

The voltage value of the voltage provided by the voltage discharging terminal can be smaller than a preset voltage value. Thus, when the drain signal is received by the control electrode of the transistor M1, the transistor M1 is turned on to couple the input terminal of the second charging sub-circuit 1202 with the voltage drain terminal, so as to discharge the input terminal of the second charging sub-circuit 1202.

The voltage bleed terminal may be, for example, a ground terminal.

Fig. 14 is a schematic structural diagram of a mobile phone 1 according to some embodiments of the present application. Fig. 15 is a schematic structural diagram of the mobile phone 1 shown in fig. 14.

As shown in fig. 14, the bleeder sub-circuit 110 may further include a sampling unit 113. The sampling unit 113 may be coupled to the power supply interface 130, and the sampling unit 113 may also be coupled to the control unit 111. The sampling unit 113 may be configured to output a sampling voltage to the control unit 111 according to a voltage of the power supply interface 130. The control unit 111 controls the output of the bleed-off signal according to the sampled voltage, for example, when the sampled voltage indicates that the voltage value of the input terminal of the power supply interface 130 is greater than or equal to a preset voltage value, the control unit 111 outputs the bleed-off signal.

The sampling unit 113 may include a voltage dividing circuit built using resistors.

For example, as shown in fig. 15, the sampling unit 113 may include a first voltage dividing resistor R1 and a second voltage dividing resistor R2. A first terminal of the first voltage dividing resistor R1 may be coupled to the control unit 111, and a second terminal of the first voltage dividing resistor R1 may be coupled to the power supply interface 130. The first terminal of the second voltage dividing resistor R2 may be coupled to the second terminal of the first voltage dividing resistor R1, and the second terminal of the second voltage dividing resistor R2 may be coupled to the voltage discharging terminal. In this way, the sampling unit 113 can supply the sampling voltage, i.e., the voltage across the second voltage dividing resistor R2, to the control unit 111. The voltage U ₂ across the second shunt resistor R2 is:

U₂=R₂/（R₁+R₂）*U_{Power supply}。

Wherein R ₁ is the resistance of the first voltage dividing resistor, R ₂ is the resistance of the second voltage dividing resistor, and U _{Power supply} is the voltage at the power supply interface 130.

In this way, the magnitude of the sampling voltage supplied to the control unit 111 can be adjusted by adjusting the ratio of the resistances of the first voltage dividing resistor R1 and the second voltage dividing resistor R2, so that the problem that the selection of the control unit 111 is limited by the sampling voltage can be improved.

The sampling unit 113 may further include a functional device capable of outputting an input voltage (voltage of the power supply interface 130) at a preset ratio (amplification factor), such as a voltage follower, for example.

Fig. 16 is a schematic structural diagram of a mobile phone 1 according to some embodiments of the present application. Fig. 17 is a schematic structural diagram of the mobile phone 1 shown in fig. 16.

As shown in fig. 16, the handset 1 may also include a reference voltage source 114. The reference voltage source 114 may be coupled to the bleeder subcircuit 110, and the reference voltage source 114 may also be coupled to the SOC. The reference voltage source 114 may be used to provide a reference voltage for the bleeder subcircuit 110. The SOC may adjust a voltage value of the reference voltage according to a preset voltage value.

In this way, the voltage value of the reference voltage can be adjusted through the SOC, so that the voltage value of the reference voltage can be matched with the preset voltage values of different protection units.

As shown in fig. 17, the reference voltage source 114 may include a voltage source 1141 and a buck-boost circuit 1142. A voltage source 1141 may be used to provide the supply voltage. The buck-boost circuit 1142 may be coupled to a voltage source 1141, and the buck-boost circuit 1142 may also be coupled to the processing chip SOC. The boost-buck circuit 1142 may be used to output a reference voltage based on a supply voltage under control of the processing chip SOC.

Illustratively, buck-boost circuit 1142 may be a transformer chip with both buck and boost functions.

Of course, in other examples, reference voltage source 114 may also include a voltage transformation circuit having only a step-up function or a step-down function, such as a step-up chopper circuit or a step-down chopper circuit. Or the reference voltage source 114 may also include a bandgap reference source, a low dropout linear regulator (low dropout regulator, LDO), and other devices with voltage transformation function.

Fig. 18 is a schematic diagram of the mobile phone 1 according to the embodiment of fig. 17 during charging. Fig. 19 is a schematic diagram showing voltage changes at points a and B in fig. 18.

The arrangement of the first voltage source V1 and the second voltage source V2 in fig. 18 is the same as that in fig. 8, and will not be described here again. The third voltage source V3 is used for providing the reference voltage for the comparator U1 by the analog reference voltage source 114, and the voltage value of the reference voltage is set to 33V.

As shown in fig. 18, a first end of the first voltage dividing resistor R1 is coupled to the point a; transistor M1 in bleed unit 112 is coupled to the input (point B) of second protection unit 1212 to discharge the input of second charge subcircuit 1202 under control of the bleed signal.

As shown in fig. 19, when a surge occurs, the voltage at the power supply interface 130 (point a) starts to rise, the first transistor T1 and the second transistor T2 in the second protection unit 1212 are turned off, and the current in the second charging sub-circuit 1202 changes sharply in a short time, but since the parasitic inductance has an effect of preventing abrupt change of the current at both ends, the voltage of the parasitic inductance near the end of the open circuit will rise instantaneously, i.e., the voltage of the input terminal (point B) of the second protection unit 1212 starts to rise under the effect of the parasitic inductance. Meanwhile, when the voltage at the power supply interface 130 rises to the reference voltage, the comparator U1 outputs a bleed signal to control the transistor M1 in the bleed unit 112 to discharge the input terminal of the second protection unit 1212, so that the voltage at the input terminal of the second protection unit 1212 starts to decrease rapidly after rising to 33V. Thus, the input terminal of the second protection unit 1212 does not generate a spike voltage under the action of the bleeder circuit 110.

Fig. 20 is a schematic structural diagram of a mobile phone 1 according to some embodiments of the present application.

As shown in fig. 20, the mobile phone 1 may further include a switching unit 170, a wireless charging unit 180, and a fourth transforming unit 1224. The switch unit 170, the wireless charging unit 180, and the fourth transforming unit 1224 may be located on the second circuit board 12. In other exemplary embodiments, the switching unit 170, the wireless charging unit 180, and the fourth transforming unit 1224 may also be located on the first circuit board 11.

An input terminal of the fourth transforming unit 1224 may be coupled to the battery 20, and an output terminal of the fourth transforming unit 1224 may be coupled to an input terminal of the switching unit 170. The fourth transforming unit 1224 may transform the voltage provided by the battery 20 and input the transformed voltage to the switching unit 170. The fourth transforming unit 1224 may also provide an operating voltage for the wireless charging unit 180.

Illustratively, the fourth transformation unit 1224 may include a boost chopper circuit or a buck chopper circuit.

An output of the switching unit 170 may be coupled with the power supply interface 130. The switching unit 170 may be used to control the battery 20 to charge an external charging device. For example, when the external charging device is coupled to the power supply interface 130, the switch unit 170 is turned on, so that the battery 20 can provide the charging current for the external charging device through the power supply interface 130.

The switching unit 170 may be a load switch, for example.

The wireless charging unit 180 may be coupled with the second transforming unit 1222, and the wireless charging unit 180 may be further coupled with the fourth transforming unit 1224. The wireless charging unit 180 may be matched with an external wireless charging device, and generate a charging voltage under the action of the external wireless charging device, and the charging voltage is transformed by the second transforming unit 1222 to charge the battery 20.

It will be apparent to those skilled in the art from this description that, for convenience and brevity of description, only the above-described division of the functional modules is illustrated, and in practical application, the above-described functional allocation may be performed by different functional modules according to needs, i.e. the internal structure of the apparatus is divided into different functional modules to perform all or part of the functions described above.

In the several embodiments provided by the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of modules or units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another apparatus, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and the parts shown as units may be one physical unit or a plurality of physical units, may be located in one place, or may be distributed in a plurality of different places. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units described above may be implemented in hardware.

The foregoing is merely illustrative of specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions within the technical scope of the present application should be covered by the scope of the present application. Therefore, the protection scope of the application is subject to the protection scope of the claims.

Claims

1. A charging circuit for charging a battery, the charging circuit comprising:

A power supply interface for providing a power supply voltage;

The input ends of the charging sub-circuits are coupled with the power supply interface, and the output ends of the charging sub-circuits are used for being coupled with the battery; the charging sub-circuit comprises a protection unit, and when the voltage value of the input end of the charging sub-circuit is larger than or equal to a preset voltage value, a control module in the protection unit controls the protection unit to disconnect the connection between the input end of the charging sub-circuit and the output end of the charging sub-circuit; the at least two charging sub-circuits comprise a first charging sub-circuit and a second charging sub-circuit, and the parasitic inductance on the wiring between the second charging sub-circuit and the power supply interface is larger than the parasitic inductance on the wiring between the first charging sub-circuit and the power supply interface;

And the bleeder sub-circuit is coupled with the input end of the second charging sub-circuit, and discharges the input end of the second charging sub-circuit when the power supply voltage provided by the power supply interface is in surge and the input end of the second charging sub-circuit generates peak voltage so that the voltage of the input end of the second charging sub-circuit is larger than or equal to the preset voltage value.

2. The charging circuit of claim 1, wherein the bleeder circuit comprises:

the control unit is used for outputting a release signal when the voltage of the input end of the charging sub-circuit is greater than or equal to the preset voltage value;

And the bleeder unit is coupled with the control unit, is also coupled with the input end of the charging sub-circuit, and is used for discharging the input end of the charging sub-circuit under the control of the bleeder signal.

3. The charging circuit of claim 2, wherein the control unit comprises a comparator, a first input of the comparator being coupled to the power supply interface, a second input of the comparator being configured to receive a reference voltage, an output of the comparator outputting the bleed signal to the bleed unit when a voltage value of the power supply interface is greater than or equal to a voltage value of the reference voltage; the voltage value of the reference voltage is larger than or equal to the voltage value of the preset voltage.

4. The charging circuit of claim 2, wherein the control unit comprises a comparator, a first input of the comparator being coupled to an input of the charging sub-circuit, a second input of the comparator being configured to receive a reference voltage, an output of the comparator outputting the bleed signal to the bleed unit when a voltage value of the input of the charging sub-circuit is greater than or equal to a voltage value of the reference voltage; the voltage value of the reference voltage is larger than or equal to the voltage value of the preset voltage.

5. The charging circuit of claim 2, wherein the bleed unit comprises:

A transistor having a first pole coupled to the input of the charging subcircuit and a second pole coupled to a voltage bleeding terminal; a control electrode of the transistor is coupled with the control unit and is used for receiving the bleeder signal; the voltage value of the voltage provided by the voltage discharging end is smaller than the preset voltage value.

6. The charging circuit of claim 2, wherein the bleeder circuit further comprises a sampling unit coupled to the power supply interface, the sampling unit further coupled to the control unit, the sampling unit configured to output a sampled voltage to the control unit based on a voltage of the power supply interface; and when the sampling voltage represents that the voltage value of the power supply interface is larger than or equal to the preset voltage value, the control unit outputs the bleeding signal.

7. The charging circuit of claim 6, wherein the sampling unit comprises:

The first end of the first voltage dividing resistor is coupled with the control unit, and the second end of the first voltage dividing resistor is coupled with the power supply interface;

and the first end of the second voltage dividing resistor is coupled with the second end of the first voltage dividing resistor, and the second end of the second voltage dividing resistor is coupled with the voltage discharging end.

8. The charging circuit of claim 1, further comprising a voltage limiting unit coupled to the power supply interface, the voltage limiting unit configured to cause a voltage value of the power supply interface to be less than a defined voltage value.

9. The charging circuit of claim 8, wherein the voltage limiting unit comprises a transient voltage suppressor, a first end of the transient voltage suppressor being coupled to the power supply interface, a second end of the transient voltage suppressor being coupled to a voltage bleed end.

10. The charging circuit of claim 1, further comprising a voltage stabilizing unit coupled to the input of the charging sub-circuit, the voltage stabilizing unit configured to stabilize a voltage at the input of the charging sub-circuit.

11. The charging circuit of claim 10, wherein the voltage stabilizing unit comprises a voltage stabilizing capacitor, a first plate of the voltage stabilizing capacitor is coupled to the input of the charging subcircuit, and a second plate of the voltage stabilizing capacitor is coupled to the voltage bleeding terminal.

12. The charging circuit of claim 1, further comprising a voltage transformation unit commonly connected in series with the protection unit between an input of the charging sub-circuit and an output of the charging sub-circuit, the voltage transformation unit being configured to generate a charging voltage from a voltage of the input of the charging sub-circuit and transmit the charging voltage to the battery.

13. An electronic device comprising a battery, and a charging circuit according to any one of claims 1-12, the charging circuit being coupled to the battery.

14. The electronic device of claim 13, wherein the electronic device further comprises:

the power supply interface and the first charging sub-circuit are positioned on the first circuit board, the input end of the first charging sub-circuit is coupled with the power supply interface, the output end of the first charging sub-circuit is coupled with the battery, and the first charging sub-circuit is used for providing a first charging loop for the battery;

The second charging sub-circuit is located on the second circuit board, the input end of the second charging sub-circuit is coupled with the power supply interface through a jumper wire, the output end of the second charging sub-circuit is coupled with the battery, and the second charging sub-circuit is used for providing a second charging loop for the battery.

15. The electronic device of claim 14, wherein the bleeder circuit is located on the first circuit board or the second circuit board.

16. The electronic device of claim 13, wherein the electronic device further comprises:

a reference voltage source coupled to the bleeder sub-circuit, the reference voltage source for providing a reference voltage to the bleeder sub-circuit;

The processing chip is coupled with the reference voltage source and is used for adjusting the voltage value of the reference voltage according to the preset voltage value and controlling the voltage value of the reference voltage to be larger than or equal to the preset voltage value;

And when the voltage of the input end of the charging sub-circuit is larger than or equal to the voltage value of the reference voltage, the discharging sub-circuit discharges the input end of the charging sub-circuit.

17. The electronic device of claim 16, wherein the reference voltage source comprises a power supply and a buck-boost circuit, the power supply configured to provide a supply voltage; the step-up and step-down circuit is coupled with the power supply, the step-up and step-down circuit is further coupled with the processing chip, and the step-up and step-down circuit is used for outputting the reference voltage according to the power supply voltage under the control of the processing chip.

18. The charging control method is characterized by being applied to a charging circuit, wherein the charging circuit is used for charging a battery and comprises a power supply interface, at least two charging sub-circuits and a discharging sub-circuit; the input end of the charging sub-circuit is coupled with the power supply interface, the output end of the charging sub-circuit is coupled with the battery, and the charging sub-circuit comprises a protection unit; the at least two charging sub-circuits comprise a first charging sub-circuit and a second charging sub-circuit, and the parasitic inductance on the wiring between the second charging sub-circuit and the power supply interface is larger than the parasitic inductance on the wiring between the first charging sub-circuit and the power supply interface; the bleeder sub-circuit is coupled with the input end of the second charging sub-circuit;

The control method comprises the following steps:

When the voltage value of the input end of the second charging sub-circuit is larger than or equal to a preset voltage value, the protection unit controls the power supply interface to be disconnected from the battery, and the discharging sub-circuit discharges surge voltage and peak voltage at the input end of the second charging sub-circuit.

19. The control method of claim 18, wherein the bleeder sub-circuit comprises a comparator and a bleeder unit; the first input end of the comparator is coupled with the power supply interface, and the second input end of the comparator is used for receiving a reference voltage; the bleeder unit is coupled with the output end of the comparator, and is also coupled with the input end and the voltage bleeder end of the charging sub-circuit respectively; the voltage value of the reference voltage is larger than or equal to the voltage value of the preset voltage, and the voltage value of the voltage provided by the voltage discharging end is smaller than the preset voltage value;

The control method comprises the following steps:

when the voltage value of the power supply interface is larger than or equal to the voltage value of the reference voltage, the output end of the comparator outputs a discharge signal to the discharge unit, and the discharge unit is controlled to be communicated with the input end of the charging sub-circuit and the voltage discharge end so as to discharge the input end of the charging sub-circuit.