WO2022057596A1

WO2022057596A1 - Battery protection circuit, battery assembly and electronic device

Info

Publication number: WO2022057596A1
Application number: PCT/CN2021/115170
Authority: WO
Inventors: 宋利军; 宋朋亮; 徐茂生
Original assignee: 西安稳先半导体科技有限责任公司
Priority date: 2020-09-15
Filing date: 2021-08-27
Publication date: 2022-03-24

Abstract

Provided in the present application is a battery protection circuit, comprising: a power supply end, a power supply grounding end, an overcharge voltage protection unit, an over-discharge voltage protection unit, a discharge overcurrent protection unit, a charge overcurrent protection unit, a control unit, and a first switch unit; the power supply end and the power supply grounding end are respectively used for electrically connecting a battery; the first switch unit is used for controlling the battery to supply power to a system circuit; the battery protection circuit also comprises a reset input end, and the reset input end is used for electrically connecting to the system circuit; when the reset input end receives a first signal, the control unit controls the first switch unit to be switched off so that the battery stops supplying power to the system circuit; and after the first switch unit is disconnected for a first preset period of time, the control unit controls the first switch unit to turn on, so as to recover the battery to supply power to the system circuit. Further provided by embodiments of the present application are a battery assembly and an electronic device. The present application has the following advantages: the resetting of an electronic device may be achieved at a low cost.

Description

A battery protection circuit, battery assembly and electronic device

technical field

The present application relates to the technical field of electronic device reset, and in particular, to a battery protection circuit, a battery assembly and an electronic device.

Background technique

For existing electronic devices, such as computers and mobile phones, when there is a problem with the system, such as a blue screen or other failure, the user generally presses the power button for a long time to reset and restart the electronic device.

Please refer to FIG. 1 for a circuit block diagram of an existing electronic device to achieve reset and restart. The electronic device includes a battery 910, a battery protection circuit 920, a system circuit 930, a second switch unit 950 and a reset IC chip 940. When the electronic device encounters a failure , the user triggers to generate a reset signal, after the reset IC chip 940 receives the reset signal, the reset IC chip 940 controls the second switch unit 950 to turn off, the battery 910 stops supplying power to the system circuit 930, and after a predetermined time, the reset IC chip 940 controls the second switch unit 950 The second switch unit 950 is turned on to restore the power supply to the system circuit 930, and the electronic device is restarted.

However, the existing electronic device needs to install a separate reset IC chip 940 and a second switch unit 950, and the reset IC chip 940 itself has a high cost, which leads to a high cost of the electronic device itself.

SUMMARY OF THE INVENTION

The technical problem to be solved by the embodiments of the present application is to provide a battery protection circuit, a battery assembly and an electronic device. The reset of the electronic device can be realized at low cost.

In order to solve the above technical problem, a first aspect of the embodiments of the present application provides a battery protection circuit, including: a power supply terminal, a power ground terminal, an overcharge voltage protection unit, an overdischarge voltage protection unit, a discharge and overcurrent protection unit, a charging an overcurrent protection unit, a control unit, and a first switch unit, wherein the power supply terminal and the power ground terminal are respectively used for electrical connection with the battery, and the first switch unit is used to control the battery to supply power to the system circuit;

Wherein, the battery protection circuit further includes a reset input terminal, the reset input terminal is used for electrical connection with the system circuit, and when the reset input terminal receives the first signal, the control unit controls the first switch unit to be disconnected to make the battery The power supply to the system circuit is stopped, and after the first switch unit is turned off for a first preset time period, the control unit controls the first switch unit to be turned on to restore the battery to supply power to the system circuit.

Optionally, when the reset input terminal receives the first signal, the battery protection circuit is triggered to generate a reset control signal and send it to the control unit, and the control unit controls the first switch unit to turn off after receiving the reset control signal to stop the battery from flowing to the battery. After the system circuit is powered and the first switch unit is turned off for a first preset time period, the first switch unit is controlled to be turned on to restore the battery to supply power to the system circuit.

Optionally, the reset control signal includes a reset turn-off signal and a reset turn-on signal, the first signal includes a first-stage signal and a second-stage signal, wherein the first-stage signal includes a continuous high-level signal or a continuous high-level signal. The second stage signal includes a pulse signal; the battery protection circuit includes an initial verification unit, a reset unit and a reset timing unit, wherein the initial verification unit and the reset unit are respectively associated with the The reset input terminal is electrically connected, the initial verification unit is also electrically connected to the reset unit, the reset unit is electrically connected to the reset timing unit, and the output terminal of the reset timing unit is electrically connected to the control unit. When the initial verification unit receives a continuous high level signal or a continuous low level signal for a predetermined duration, the verification unit sends a signal to the reset unit so that the reset unit detects the first signal. When the number of pulses received in the time period is greater than or equal to the first predetermined number, the reset turn-off signal is triggered to control the first switch unit to be disconnected. The turn-on signal is reset to control the first switch unit to turn on.

Optionally, the battery protection circuit further includes a comparator, a first input terminal of the comparator is electrically connected to the reset input terminal, and the first input terminal is also electrically connected to the system ground terminal through a first resistor, the The second input terminal of the comparator is connected to a reference voltage, and the output terminal of the comparator is electrically connected to the initial verification unit and the reset unit respectively.

Optionally, the first signal includes a pulse signal, the reset control signal includes a reset turn-off signal and a reset turn-on signal, and the battery protection circuit further includes a pulse counting unit and a reset timing unit, the pulse counting unit and the The reset input terminal is electrically connected, the output terminal of the reset counting unit is electrically connected to the reset timing unit, and the output terminal of the reset timing unit is electrically connected to the control unit. When the number of pulses is greater than or equal to the second predetermined number, a reset turn-off signal is triggered to control the first switch unit to be disconnected, and when the reset timing unit times the first switch unit disconnected for a first preset time period, a reset turn-on signal is generated to control The first switch unit is turned on.

Optionally, the first signal includes a continuous high-level signal or a continuous low-level signal, the reset control signal includes a reset turn-off signal and a reset turn-on signal, and the battery protection circuit further includes a reset timing unit, The reset timing unit is electrically connected to the reset input terminal, and when the duration of the high-level signal or the low-level signal received by the reset timing unit is greater than or equal to a fourth preset time period, a reset shutdown signal is triggered to generate a reset shutdown signal to control The first switch unit is turned off, and when the reset timing unit counts the first switch unit being turned off for a first preset time period, a reset turn-on signal is generated to control the first switch unit to turn on.

Optionally, the first signal is an encoded signal pre-agreed between the battery protection circuit and the system circuit.

Optionally, the first switch unit includes a MOS transistor.

Optionally, the battery protection circuit is implemented on the same chip, or all units of the battery protection circuit except the first switch unit are implemented on the same chip.

A second aspect of the embodiments of the present application provides a battery assembly, including:

Battery;

The above battery protection circuit, wherein the power supply terminal and the power ground terminal of the battery protection circuit are respectively electrically connected to the battery, the first switch unit of the battery protection circuit is used to control the battery to supply power to the system circuit, the battery protection circuit The reset input of the circuit is used for electrical connection with the system circuit.

A third aspect of the embodiments of the present application provides an electronic device, including:

The above-mentioned battery assembly;

A system circuit, wherein the battery is controlled to supply power to the system circuit via a first switch unit of the battery protection circuit, and the system circuit is electrically connected to a reset input terminal of the battery protection circuit.

A fourth aspect of an embodiment of the present application provides a battery protection circuit, including: a power supply terminal, a power ground terminal, a voltage protection unit, a current protection unit, a control unit, and a first switch unit, wherein the power supply terminal and the power supply The ground terminals are respectively used for electrical connection with the battery, and the first switch unit is used for controlling the battery to supply power to the system circuit;

The power supply terminal is also used for electrical connection with the reset output terminal of the system circuit. When the voltage signal received by the power supply terminal changes due to the change of the signal transmitted from the reset output terminal, the control unit controls the first A switch unit is turned off to stop the battery from supplying power to the system circuit, and the control unit controls the first switch unit to turn on after the first switch unit is turned off for a first preset time period to restore the battery to supply power to the system circuit.

Optionally, the battery protection circuit includes an initial verification unit, a reset unit, and a reset timing unit, wherein the initial verification unit and the reset unit are respectively electrically connected to the power supply terminal, and the initial verification unit is electrically connected to the power supply terminal. The unit is also electrically connected to the reset unit, the reset unit is electrically connected to the reset timing unit, and the output end of the reset timing unit is electrically connected to the control unit. When the signal of high level or continuous low level, the verification unit sends a signal to the reset unit to enable the reset unit to detect the signal of the power supply terminal. When the reset unit detects that the number of pulses received within the second preset time period is greater than or when it is equal to the first predetermined number, a reset turn-off signal is triggered to be generated to control the first switch unit to be turned off by the control unit, and a reset turn-on signal is generated after the reset timing unit timed the first switch unit to turn off for a first preset time period to be controlled by the control unit The unit controls the first switch unit to be turned on.

Optionally, the battery protection circuit further includes a comparator, the first input terminal of the comparator is electrically connected to the power supply terminal, the second input terminal of the comparator is connected to a reference voltage, and the comparator The output terminals are respectively electrically connected with the initial verification unit and the reset unit.

Optionally, when the number of pulses received by the power supply terminal within the third preset time period is greater than or equal to the second predetermined number, the control unit controls the first switch unit to turn off to stop the battery from supplying power to the system circuit, and the first After a switch unit is turned off for a first preset period of time, the control unit controls the first switch unit to be turned on to restore power from the battery to the system circuit.

Optionally, the battery protection circuit further includes a pulse counting unit and a reset timing unit, the pulse counting unit is electrically connected to the power supply terminal, the output end of the reset counting unit is electrically connected to the reset timing unit, the The output end of the reset timing unit is electrically connected to the control unit, and when the number of pulses received by the pulse counting unit in the third preset time period is greater than or equal to the second predetermined number, a reset shutdown signal is triggered to control the first The switch unit is turned off, and when the reset timing unit counts the first switch unit being turned off for a first preset time period, a reset turn-on signal is generated to control the first switch unit to turn on through the control unit.

Optionally, when the duration of the high-level signal or the low-level signal received by the power supply terminal within a predetermined period of time is greater than or equal to the fourth preset period of time, the control unit controls the first switch unit to be disconnected to make the The battery stops supplying power to the system circuit, and the control unit controls the first switch unit to turn on after the first switch unit is turned off for a first preset time period.

Optionally, the battery protection circuit further includes a reset timing unit, the reset timing unit is electrically connected to the power supply terminal, and the output end of the reset timing unit is electrically connected to the control unit. The change of the reset output signal causes the received high-level signal or low-level signal to last longer than or equal to the fourth preset time period to trigger the generation of a reset turn-off signal to control the first switch unit to be disconnected. When the reset timing The unit generates a reset turn-on signal to control the turn-on of the first switch unit after timing the turn-off of the first switch unit for a first preset time period.

Optionally, the signal received by the power supply end from the reset output end is an encoded signal pre-agreed by the battery protection circuit and the system circuit.

Optionally, the first switch unit includes a MOS transistor.

Optionally, the battery protection circuit is located on the same chip, or all units of the battery protection circuit except the first switch unit are located on the same chip.

A fifth aspect of the embodiments of the present application provides a battery assembly, including:

Battery;

The above battery protection circuit, wherein the power supply terminal and the power ground terminal of the battery protection circuit are respectively electrically connected to the battery, the first switch unit of the battery protection circuit is used to control the battery to supply power to the system circuit, the battery protection circuit The power supply terminal of the circuit is also used for electrical connection with the reset output terminal of the system circuit.

A sixth aspect of the embodiments of the present application provides an electronic device, including:

The above-mentioned battery assembly;

A system circuit, wherein the battery is controlled to supply power to the system circuit through a first switch unit of the battery protection circuit, and a reset output terminal of the system circuit is electrically connected to a power supply terminal of the battery protection circuit.

Optionally, the reset output terminal of the system circuit is electrically connected to the power supply terminal of the battery protection circuit via a second resistor, and the reset output terminal changes the voltage signal received by the power supply terminal when its signal changes. Outside the time is high resistance state.

Implementing the embodiments of the present application has the following beneficial effects: because the battery protection circuit further includes a reset input terminal, the reset input terminal is used for electrical connection with the system circuit, and the control unit controls the first signal when the reset input terminal receives the first signal. A switch unit is turned off to stop the battery supplying power to the system circuit, and the control unit controls the first switch to be turned on after the first switch unit is turned off for a first preset time period to restore the battery to supply power to the system circuit. Therefore, using the existing first switch unit to realize the reset and restart function only needs to add a reset input terminal or share it with other terminals, and it is not necessary to separately add a reset IC chip and a second switch unit matched with the reset IC chip, thereby greatly reducing the need for It reduces the cost and increases the competitiveness of electronic devices.

Description of drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

1 is a circuit block diagram of an existing electronic device for realizing reset and restart;

2 is a schematic diagram of a circuit module of the electronic device according to the first embodiment of the present application;

3 is a schematic diagram of a circuit module of another electronic device according to the first embodiment of the present application;

4 is a schematic diagram of the electrical connection between the reset input terminal and the control unit according to the first embodiment of the present application;

Fig. 5 is the waveform diagram of the signal that the reset input terminal receives in Fig. 4 and the reset control signal;

6 is a schematic diagram of the electrical connection between another reset input terminal and a control unit according to the first embodiment of the present application;

7 is a schematic diagram of the electrical connection between another reset input terminal and a control unit according to the first embodiment of the present application;

Fig. 8 is the waveform diagram of the signal that the reset input terminal receives and the reset control signal in Fig. 7;

9 is a schematic diagram of electrical connection between yet another reset input terminal and a control unit according to the first embodiment of the present application;

Fig. 10 is a waveform diagram of the signal received by the reset input terminal in Fig. 9 and the reset control signal;

11 is a schematic diagram of a circuit module of an electronic device according to a second embodiment of the present application;

12 is a schematic diagram of a circuit module of still another electronic device according to the second embodiment of the present application;

13 is a schematic diagram of the electrical connection between the power supply end of the power supply and the control unit according to the second embodiment of the present application;

Fig. 14 is the waveform diagram of the signal received by the power supply terminal in Fig. 13 and the output signal of the reset timing unit;

FIG. 15 is a schematic diagram of the electrical connection between another power supply terminal and a control unit according to the second embodiment of the present application;

Fig. 16 is the waveform diagram of the signal received by the power supply terminal in Fig. 15 and the reset unit;

17 is a schematic diagram of the electrical connection between another power supply terminal and a control unit according to the second embodiment of the present application;

FIG. 18 is a schematic diagram of the electrical connection between still another power supply terminal and a control unit according to the second embodiment of the present application;

FIG. 19 is a waveform diagram of the signal received by the power supply terminal of FIG. 18 and the output signal of the reset timing unit.

detailed description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

The appearances of the terms "comprising" and "having" and any variations thereof in the specification, claims and drawings of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or modules is not limited to the listed steps or units, but optionally also includes unlisted steps or units, or optionally also includes For other steps or units inherent to these processes, methods, products or devices. In addition, the terms "first", "second", "third", etc. are used to distinguish different objects and not to describe a specific order.

An embodiment of the present application provides an electronic device, and the electronic device is, for example, a Bluetooth headset, a mobile phone, a tablet computer, and the like. Referring to FIG. 2, the electronic device includes a battery assembly and a system circuit 200. The system circuit 200 is, for example, a circuit composed of a microprocessor, a camera driving circuit, an image processor, etc. The system circuit 200 is electrically connected to the battery assembly, and the battery assembly is used to supply The system circuit 200 is powered. The battery assembly includes a battery 300 and a battery protection circuit 100, the battery protection circuit 100 is electrically connected to the positive and negative poles of the battery 300, the system circuit 200 is electrically connected to the battery protection circuit 100, the battery 300 supplies power to the battery protection circuit 100, and the battery protection circuit 100 starts The protection and reset functions, for example, protect the battery 300 when it is overcharged or overdischarged. Since how the battery protection circuit 100 protects the battery 300 from overcharge and overdischarge is a common technical means in the field, it will not be repeated here. In this embodiment, the number of the batteries 300 is one or more. When there are multiple batteries 300, the multiple batteries 300 can be connected in parallel, in series, or mixed in series and parallel. The batteries 300 are preferably lithium batteries 300, and the capacity of the batteries 300 is 10mAH-80mAH, such as 10mAH, 20mAH, 30mAH, 40mAH, 50mAH, 60mAH, 70mAH, 80mAH, the battery 300 with this capacity is small in volume, preferably, the capacity of the battery 300 is 20mAH-40mAH, and the Smaller in size, it can be easily configured in small electronic devices, such as wireless bluetooth earphones. In addition, in other embodiments of the present application, referring to FIG. 3 , a first resistor R1 and a capacitor C are further provided between the battery 300 and the battery protection circuit 100 , and the first resistor R1 and the capacitor C are set for filtering. In addition, in other embodiments of the present application, other circuits or electronic components may also be provided between the battery 300 and the battery protection circuit 100 .

In the embodiment of the present application, please continue to refer to FIG. 2 , the battery protection circuit 100 includes a power supply terminal VDD, a power ground terminal GND, an overcharge voltage protection unit 110 , an overdischarge voltage protection unit 190 , a discharge and overcurrent protection unit 130 , The charging overcurrent protection unit 120 , the reference voltage generating unit 140 , the frequency generating unit 150 , the control unit 160 , the charging detection unit 170 , and the first switching unit 180 . In addition, in other embodiments of the present application, the battery protection circuit 100 further includes a temperature protection unit, a charging overcurrent protection unit 120 and the like.

In the embodiment of the present application, the power supply terminal VDD and the power supply ground terminal GND are respectively used for electrical connection with the positive and negative poles of the battery 300 , so that the battery 300 can supply power to the battery protection circuit 100 . . The system circuit 200 forms a loop to supply power to the system circuit 200 .

In the embodiment of the present application, the overcharge voltage protection unit 110 is used to protect the battery 300 when it is detected that the charging voltage is too high during the charging process of the battery 300, for example, stop charging the battery 300, etc., to prevent the battery 300 from being charged. damage or safety issues.

In the embodiment of the present application, the over-discharge voltage protection unit 190 is used to protect the battery 300 when it is detected that the discharge voltage is too low during the discharge process of the battery 300, for example, to control the battery 300 to discharge to a minimum degree, etc. Generally, the power supply to the system circuit 200 is stopped and the power supply to the battery protection circuit 100 except the charging detection circuit is stopped, so as to prevent the battery 300 from being permanently damaged due to excessive discharge of the battery 300 .

In the embodiment of the present application, the discharge overcurrent protection unit 130 is used to protect the battery 300 when it is detected that the discharge current is too large during the discharge process of the battery 300 , for example, the battery 300 stops discharging, etc., to prevent the discharge current from being excessively high. It may cause permanent damage to the battery 300 or a safety problem. In this embodiment, the discharge overcurrent protection unit 130 includes a plurality of subunits, each of which is electrically connected to the control unit 160, and each subunit is used to process different discharge currents, and three subunits are set in the figure .

In the embodiment of the present application, the charging overcurrent protection unit 120 is used to protect the battery 300 when it is detected that the charging current is too large during the charging process of the battery 300 , for example, the battery 300 stops charging, etc., to prevent the charging current from being excessively high. It may cause permanent damage to the battery 300 or a safety problem.

In the embodiment of the present application, the reference voltage generating unit 140 is used to generate the reference voltage required by the battery protection circuit 100 , the frequency generating unit 150 is used to generate different frequencies, and the control unit 160 is respectively connected with the overcharge voltage protection unit 110 , the overdischarge The voltage protection unit 190 , the discharge overcurrent protection unit 130 , the reference voltage generation unit 140 , the frequency generation unit 150 , the charge detection unit 170 , the first switch unit 180 and the like are electrically connected. In this embodiment, the overcharge voltage protection unit 110 , the overdischarge voltage protection unit 190 , the discharge overcurrent protection unit 130 , the reference voltage generation unit 140 , the frequency generation unit 150 , and the control unit 160 are conventional circuits in the field, and here No longer.

In the embodiment of the present application, the charging detection unit 170 is configured to detect whether the electronic device is connected to a power source through a charger to charge the battery 300 , and when the electronic device is connected to the power source through the charger, the charging detection unit 170 detects a charging signal , to charge the battery 300.

In the embodiment of the present application, the first switch unit 180 includes a switch tube and a substrate control circuit, the switch tube is a MOS tube, the control end of the switch tube is electrically connected to the control unit 160 , and the substrate control circuit is electrically connected to the control unit 160 , the substrate control circuit is used to realize the correct bias of the substrate of the switch tube. However, the present application is not limited thereto. In other embodiments of the present application, the first switch unit 180 may further include a charge switch and a discharge switch, wherein the charge switch and the discharge switch are both MOS transistors, and the charge switch and the discharge switch are respectively connected to the control Unit 160 is electrically connected. In addition, in other embodiments of the present application, the first switch unit 180 may also be implemented in other forms, for example, including only one switch tube. In this embodiment, the first switch unit 180 is used to control the battery 300 to supply power to the system circuit 200 , specifically, a loop is formed by the battery 300 , the system circuit 200 , and the first switch unit 180 of the battery protection circuit 100 to supply power to the system circuit 200 . Specifically, the control terminal of the first switch unit 180 is electrically connected to the control unit 160, and the input terminal of the first switch unit 180 is used to electrically connect to the battery 300, for example, to the power ground terminal GND of the battery protection circuit 100. The output end of a switch unit 180 is used for electrical connection with the system circuit 200 , so that the battery 300 , the battery protection circuit 100 and the first switch unit 180 form a power supply loop, and the battery protection circuit 100 can control the battery by controlling the first switch unit 180 300 Whether to supply power to the system circuit 200.

In the embodiment of the present application, when a problem occurs in the system of the electronic device and needs to be restarted, there are several ways to reset the system-on-chip 100 of the electronic device, which will be described below. Of course, the ways of resetting the SoC 100 of the electronic device are not limited to the following. In other embodiments of the present application, those skilled in the art can also set other conventional circuits to realize the resetting of the SoC 100 of the electronic device. .

first embodiment

In the first embodiment of the present application, please refer to FIG. 2 , the battery protection circuit 100 further includes a reset input terminal RST, the reset input terminal RST is a newly added terminal of the battery protection circuit 100 , and the reset input terminal RST is electrically connected to the system circuit 200 . When the reset input terminal RST receives the first signal, the control unit 160 controls the first switch unit 180 to be turned off to stop the battery 300 from supplying power to the system circuit 200 , and the first switch unit 180 is turned off for a first preset time period to control the The unit 160 controls the first switch unit 180 to be turned on to restore power from the battery 300 to the system circuit 200 . In this embodiment, the generation of the first signal may be implemented by software or by hardware. When implemented by hardware, it may be implemented by, for example, a power button or a sound button of an electronic device. The first signal is generated by pressing the power button, the power button and the sound button at the same time. In addition, in other embodiments of the present application, the reset input terminal RST may not be a newly added terminal of the battery protection circuit 100 , but may be shared with other terminals of the battery protection circuit 100 , so that the same terminal can be input with different signals. implement a number of different functions.

In this embodiment, when the electronic device encounters a fault and needs to be reset, the system circuit 200 generates a first signal and outputs it to the reset input terminal RST. After the reset input terminal RST receives the first signal, the control unit 160 controls the first switch unit 180 is disconnected to make the battery 300 stop supplying power to the system circuit 200. At this time, the system circuit 200 is completely powered off, the data in the system circuit 200 is cleared, and the first switch unit 180 is disconnected for a first preset time period. After the control unit 160 controls the first switch unit 180 to be turned on to restore power from the battery 300 to the system circuit 200. At this time, the system circuit 200 is powered again, the system circuit 200 reloads data and programs, and the electronic device resets and restarts normally. In this embodiment, the existing first switch unit 180 is used to realize the reset and restart function, and only one reset input terminal RST needs to be added or shared with other terminals, and there is no need to separately add a reset IC chip and a second switch unit matched with the reset IC chip. , thereby greatly reducing the cost and increasing the competitiveness of electronic devices.

In this embodiment, when the reset input terminal RST receives the first signal, the battery protection circuit 100 is triggered to generate a reset control signal and send it to the control unit 160. After receiving the reset control signal, the control unit 160 controls the first switch unit 180 to turn off After the battery 300 stops supplying power to the system circuit 200 and the first switch unit 180 is turned off for a first period of time, the first switch unit 180 is controlled to be turned on to restore the battery 300 to supply power to the system circuit 200 . However, the present application is not limited thereto. In other embodiments of the present application, when the reset input terminal RST receives the first signal, the control unit 160 controls the first switch unit 180 to be disconnected to stop the battery 300 from supplying power to the system circuit 200 . , after the first switch unit 180 is turned off for the first time period, the control unit 160 controls the first switch to be turned on to restore the power supply from the battery 300 to the system circuit 200 , so that there is no need to generate a reset control signal in the middle.

In this embodiment, the first signal is a digital encoded signal, and the encoded signal is pre-agreed by the battery protection circuit 100 and the system circuit 200 during design. When the reset input RST receives the encoded signal, the battery protection circuit 100 The first signal can be identified. For example, the first signal includes two periods of time: the first period is a high-level signal, and the second period is a predetermined number of pulse signals. Here, the high-level signal is used to trigger the element corresponding to the battery protection circuit 100 to activate , for example, tell the component corresponding to the battery protection circuit 100 to prepare for timing or counting, and then the component corresponding to the battery protection circuit 100 will count or time the received pulse signal (for example, different pulse durations are different), when the preset requirements are met , the battery protection circuit 100 generates a reset control signal, and when the number of pulses does not meet the preset requirement, the components corresponding to the battery protection circuit 100 return to the state of not being activated at the beginning. Since the first signal is an encoded signal of the protocol between the battery protection circuit 100 and the system circuit 200, the specific form of the first signal is not limited. A complex encoded signal or a simple encoded signal may be used. The battery protection circuit 100 and the system circuit 200 pre- The battery protection circuit 100 can identify the encoded signal with a good protocol. In addition, when the first signal is relatively complex, the battery protection circuit 100 is reliable and safe, and can prevent false triggering.

In this embodiment, when the reset input terminal RST receives the first signal, there are three ways to trigger the battery protection circuit 100 to generate the reset control signal, which will be described separately below. Of course, when the reset input terminal RST receives the first signal, the manner in which the battery protection circuit 100 is triggered to generate the reset control signal is not limited to the following three. In other embodiments of the present application, those skilled in the art can also set other conventional circuits to Trigger the battery protection circuit 100 to generate a reset control signal.

1. In an embodiment of the present application, please refer to FIG. 2 , FIG. 4 and FIG. 5 , the reset control signal includes a reset turn-off signal and a reset turn-on signal, and the first signal includes a first-stage signal and a second-stage signal. signal, wherein the first-stage signal includes a continuous high-level signal or a continuous low-level signal, and the first-stage signal is used to initiate verification, that is, the battery protection circuit 100 is used to verify whether the received signal is a The first signal, here the first stage signal is a high-level signal that lasts for a predetermined period of time, such as a 16ms high-level signal, and the second stage signal is a formal reset signal, which is used to distinguish it from other signals. The second-stage signal includes a pulse signal, and the reset signal is used to tell the battery protection circuit 100 to generate a reset shutdown signal. For example, the second-stage signal includes 5 pulses.

Referring to FIG. 4 , in this embodiment, the battery protection circuit 100 further includes a start verification unit 410 , a reset unit 420 and a reset timing unit 430 . The initial verification unit 410 and the reset unit 420 are respectively directly or indirectly electrically connected to the reset input terminal RST, the initial verification unit 410 is also electrically connected to the reset unit 420, and the reset unit 420 is electrically connected to the reset input terminal RST. The reset timing unit 430 is electrically connected, and the output end of the reset timing unit 430 is electrically connected to the control unit 160 , where the reset unit 420 is a pulse counting unit. When the initial verification unit 410 receives a continuous high level signal for a predetermined duration, the verification unit sends a detection signal to the reset unit 420 to tell the reset unit 420 to start detecting the first signal. When the number of pulses received within the preset time period is greater than or equal to the first predetermined number, a reset turn-off signal is triggered to control the first switch unit 180 to turn off, and when the reset timing unit 430 times the first switch unit 180 to turn off the first preset After a set period of time, a reset turn-on signal is generated to control the first switch unit 180 to turn on. In this embodiment, please refer to FIG. 4 and FIG. 5 in combination, the reset turn-off signal is a low-level signal, the reset-on signal is a high-level signal, and the first predetermined number is, for example, 5, 3, 4, 6, 7, 8 pulses, the first preset time period and the second preset time period are, for example, 16ms, 20ms, 32ms, and so on. In this embodiment, when the initial verification unit 410 does not send a detection signal to the reset unit 420, the reset unit 420 does not detect the signal of the reset input terminal RST, that is, the detection signal is used to trigger the reset unit 420 to perform the reset input terminal RST signal is detected. In this embodiment, through the settings of the initial verification unit 410 , the reset unit 420 and the reset timing unit 430 , false triggering of the reset action can be greatly avoided. In addition, in other embodiments of the present application, when the supply of the reset on signal is stopped, it is the reset off signal at this time, that is, the reset off signal does not need to be additionally generated.

In addition, in order to further prevent false triggering, in other embodiments of the present application, referring to FIG. 6 , the battery protection circuit 100 further includes a comparator 440 and a second resistor R2 . The first input terminal of the comparator 440 is electrically connected to the reset input terminal RST, the first input terminal is also connected to the system ground terminal VM via the second resistor R2, and the second input terminal of the comparator 440 is connected to a reference voltage , wherein the voltage value of the reference voltage is relative to the power ground terminal GND, and the output terminals of the comparator 440 are respectively electrically connected to the initial verification unit 410 and the reset unit 420 . Here, through the setting of the comparator 440, the signal of the reset input terminal RST can be shaped, and the signal lower than the reference voltage can be filtered out to further prevent false triggering; at the same time, since the voltage of the reset input terminal RST is relative to the system ground terminal VM, and the reference voltage is relative to the power ground terminal GND, so that the voltage signal of the reset input terminal RST can be uniformly converted to the relative power ground terminal GND, so as to avoid problems caused by the voltage signal of the reset input terminal RST changing back and forth.

2. In an embodiment of the present application, in order to reduce costs, please refer to FIG. 2 , FIG. 7 and FIG. 8 , the reset control signal includes a reset turn-off signal and a reset turn-on signal, and the first signal includes a pulse signal. The battery protection circuit 100 further includes a pulse counting unit 510 , a third resistor R3 and a reset timing unit 520 . Here, the reset input terminal RST defaults to a low level. In this embodiment, the reset input terminal RST is grounded through the third resistor R3 to achieve a low level. The pulse counting unit 510 outputs a high level signal under normal conditions. The input terminal RST is electrically connected to the pulse counting unit 510, and the output terminal of the pulse counting unit 510 is electrically connected to the reset timing unit 520. The reset timing unit 520 outputs a high-level signal under normal conditions, and the output terminal of the reset counting unit is connected to the control unit 160. electrical connection. When the reset input terminal RST receives the first signal, the pulse counting unit 510 counts the pulses, and the pulse counting unit 510 triggers counting with a rising edge. or equal to the second predetermined number, the output signal of the pulse counting unit 510 changes from high level to low level, and the low level at this time is the reset turn-off signal. When the reset timing unit 520 times the first switch unit 180 to turn off After the first preset time period, a reset-on signal is generated to control the first switch unit 180 to be turned on, where the reset-on signal is a high-level signal. The first preset time period, the third preset time period and the first predetermined number are preset by the battery protection circuit 100, and the first preset time period and the third preset time period are, for example, 16ms, 20ms, and 32ms. etc., the first predetermined number is, for example, 3, 4, 5, etc., so that the design can prevent false triggering. In addition, in other embodiments of the present application, the output terminal of the pulse counting unit 510 outputs a low level under normal conditions, and at this time, the high level is the reset turn-off signal, and the low level is the reset turn-on signal. In this embodiment, the pulse counting unit 510 is provided separately from the reset timing unit 520 . In addition, in other embodiments of the present application, the pulse counting unit 510 may also be integrated with the reset timing unit 520 .

3. In another embodiment of the present application, please refer to FIG. 2 , FIG. 9 and FIG. 10 , the reset control signal includes a reset turn-off signal and a reset turn-on signal, and the first signal includes a continuous high level or a continuous low level. Signal. The battery protection circuit 100 further includes a reset timing unit 610 and a fourth resistor R4. Here, the reset input terminal RST defaults to a low level. In this embodiment, the reset input terminal RST is grounded through the fourth resistor R4 to achieve a low level. The reset timing unit 610 outputs a high level signal under normal conditions. The input terminal RST is electrically connected to the reset timing unit 610 , and the output terminal of the reset timing unit 610 is electrically connected to the control unit 160 . When the first signal received by the reset input terminal RST is a high-level signal, that is, when the signal received by the reset input terminal RST changes from a low level to a high level, the reset timing unit 610 triggers timing, and the reset timing unit 610 starts with a rising edge. Trigger timing, when the duration of the high-level signal received by the reset timing unit 610 is greater than or equal to the fourth preset time period, the output signal of the reset timing unit 610 changes from high-level to low-level, and the low-level signal It is the reset turn-off signal. When the reset timing unit 610 times the first switch unit 180 to be disconnected for a first preset time period, a reset turn-on signal is generated to control the first switch unit 180 to turn on. Here, the reset turn-on signal is a high-level signal. . The fourth preset time period is preset by the battery protection circuit 100, and the fourth preset time period is, for example, 10 seconds, 5 seconds, 3 seconds, 1 second, etc., which can prevent false triggering. In addition, in other embodiments of the present application, the output terminal of the reset timing unit 610 outputs a low-level signal under normal conditions, and at this time, the high-level signal is the reset-off signal, and the low-level signal is the reset-on signal. In this embodiment, the reset timing unit 610 is provided separately from the control unit 160 . In addition, in other embodiments of the present application, the reset timing unit 610 may also be integrated into the control unit 160 .

In this embodiment, please continue to refer to FIG. 2 , the battery protection circuit 100 further includes a system ground terminal VM, the system ground terminal VM is used for electrical connection with the system circuit 200 , and the system ground terminal VM is also used for charging. In this embodiment, a first switch unit 180 is disposed between the system ground and the power ground terminal GND.

In this embodiment, the battery protection circuit 100 is formed on the same chip, that is, the battery protection circuit 100 is formed as a whole system on a chip. The system on chip (SOC) is a technology commonly used in the field of integrated circuits. The purpose is to Combining multiple integrated circuits with specific functions on one chip to form a system or product, which contains the completed hardware system and the embedded software it carries. SoCs have obvious advantages in performance, cost, power consumption, reliability, as well as life cycle and scope of use. In addition, in other embodiments of the present application, referring to FIG. 3 , the units of the battery protection circuit 100 except the first switch unit 180 are all implemented on the same chip, that is, the battery protection circuit 100 except the first switch unit 180 The other units are made into a system-on-chip as a whole. In addition, in other embodiments of the present application, the first resistor R1 and the capacitor C in FIG. 3 can also be implemented in a system-on-chip.

Second Embodiment

In the second embodiment, please refer to FIG. 11, the battery protection circuit 100_2 includes a power supply terminal VDD_2, a power ground terminal GND_2, a voltage protection unit, a current protection unit, a reference voltage generation unit 140_2, a frequency generation unit 150_2, a control unit 160_2, The charging detection unit 170_2 and the first switch unit 180_2. In this embodiment, the voltage protection unit includes an overcharge voltage protection unit 110_2 and/or an overdischarge voltage protection unit 190_2, and the current protection unit includes a discharge overcurrent protection unit 130_2 and/or a charge overcurrent protection unit 120_2. In addition, in other embodiments of the present application, the battery protection circuit 100_2 further includes a temperature protection unit, a charging overcurrent protection unit 120_2 and the like.

In this implementation, please continue to refer to FIG. 11 , the power supply terminal VDD_2 is also electrically connected to the reset output terminal 210_2 of the system circuit 200_2 , so that the power supply terminal VDD_2 is divided into two branches, and one branch enters through the power supply terminal VDD_2 Inside the battery protection circuit 100_2, a branch enters the system circuit 200_2 through the reset output terminal 210_2. When the system circuit 200_2 is controlled to change the signal of the reset output terminal 210_2, the voltage signal of the power supply terminal VDD_2 changes accordingly. At this time, the control unit 160_2 controls the first switch unit 180_2 to be turned off to stop the battery 300_2 from supplying power to the system circuit 200_2. After the first switch unit 180_2 is turned off for a first preset time period, the control unit 160_2 controls the first switch unit 180_2 to turn on (close). ) to restore power from the battery 300_2 to the system circuit 200_2. In this embodiment, controlling the inside of the system circuit 200_2 to change the signal of the reset output terminal 210_2 can be implemented by software or hardware. It is realized by the power button or the sound button, for example, by long-pressing the power button, pressing the power button and the sound button at the same time, etc., to change the signal on the reset output terminal 210_2.

In this embodiment, when the electronic device encounters a fault and needs to be reset, the user controls the system circuit 200_2 so that the signal on the reset output terminal 210_2 of the system circuit 200_2 changes, resulting in the change of the voltage signal of the power supply terminal VDD_2 , at this time, the control unit 160_2 controls the first switch unit 180_2 to be disconnected to stop the battery 300_2 from supplying power to the system circuit 200_2. At this time, the system circuit 200_2 is completely powered off, the data in the system circuit 200_2 is cleared, and the first switch unit 180_2 After the first preset time period is disconnected, the control unit 160_2 controls the first switch unit 180_2 to turn on to restore the power supply from the battery 300_2 to the system circuit 200_2. At this time, the system circuit 200_2 is powered again, the system circuit 200_2 reloads data and programs, and the electronic device realizes Reset normal restart. In this embodiment, the existing first switch unit 180_2 is used to realize the reset and restart function, and there is no need to separately add a reset IC chip and a second switch unit matched with the reset IC chip, thereby greatly reducing the cost and increasing the cost of the electronic device. Competitiveness.

In this embodiment, the signal received by the power supply terminal VDD_2 from the reset output terminal 210_2 is a digital coded signal, which causes the voltage signal received by the power supply terminal VDD_2 to change. Since the battery 300_2 outputs a DC voltage, the power supply The signal received by the terminal VDD_2 from the reset output terminal 210_2 and the signal from the battery 300_2 is also a digital encoded signal, and the digital encoded signal output by the power supply terminal VDD_2 corresponds to the digital encoded signal output by the reset output terminal 210_2. The coded signal output by the reset output terminal 210_2 is pre-agreed by the battery protection circuit 100_2 and the system circuit 200_2 during design. When the power supply terminal VDD_2 receives the coded signal, the battery protection circuit 100_2 can identify the signal. For example, the encoded signal includes two periods of time: the first period is a low-level signal, and the second period is a predetermined number of pulse signals, where the low-level signal is used to trigger the element corresponding to the battery protection circuit 100_2 to activate , for example, tell the element corresponding to the battery protection circuit 100_2 to prepare for timing or counting, and then the element corresponding to the battery protection circuit 100_2 counts or times the received pulse signal (for example, different pulse durations are different), when the preset requirements are met , the control unit 160_2 controls the first switch unit 180_2 to be turned off so that the battery 300_2 stops supplying power to the system circuit 200_2, and the control unit 160_2 controls the first switch unit 180_2 to turn on to restore the battery after the first switch unit 180_2 is turned off for a first preset time period 300_2 supplies power to the system circuit 200_2; when the number of pulses does not meet the preset requirement, the components corresponding to the battery protection circuit 100_2 return to the state of not being activated at the beginning. In addition, in other embodiments of the present application, the first period of time is a predetermined number of pulse signals, and the second period of time is a low-level signal or a high-level signal of a predetermined duration. Since the coded signal is the coded signal of the protocol between the battery protection circuit 100_2 and the system circuit 200_2, the specific form of the coded signal is not limited, a complex coded signal or a simple coded signal can be used, and the battery protection circuit 100_2 and the system circuit 200_2 are pre-agreed The encoded signal of the battery protection circuit 100_2 can be identified. In addition, when the encoded signal is complex, the battery protection circuit 100_2 is reliable and safe, and can prevent false triggering.

In this embodiment, there are the following ways to realize the change of the signal of the reset output terminal 210_2 of the system circuit 200_2 to cause the voltage signal received by the power supply terminal VDD_2 to change, which will be described separately below. Of course, the ways of realizing the change of the signal of the reset output terminal 210_2 of the system circuit 200_2 and causing the voltage signal received by the power supply terminal VDD_2 to change are not limited to the following. In other embodiments of the present application, those skilled in the art can also Other conventional circuits can be provided to realize the change of the signal of the reset output terminal 210_2 of the system circuit 200_2 to cause the change of the voltage signal received by the power supply terminal VDD_2.

1. In an embodiment of the present application, please refer to FIG. 11 , FIG. 13 and FIG. 14 , when the number of pulses received by the power supply terminal VDD_2 within the third preset time period is greater than or equal to the second predetermined number, the control unit 160_2 The first switch unit 180_2 is controlled to be turned off to stop the battery 300_2 from supplying power to the system circuit 200_2. After the first switch unit 180_2 is turned off for a first preset time period, the control unit 160_2 controls the first switch unit 180_2 to be turned on to restore the battery 300_2 to the system circuit 200_2 powered.

Specifically, the reset output terminal 210_2 is electrically connected to the power supply terminal VDD_2 via a second resistor R2_2, and the second resistor R2_2 and the first resistor R1_2 have the same resistance value. In a normal state, the reset output terminal 210_2 is in a high-impedance state.

Specifically, in this embodiment, the system circuit 200_2 includes a third switch unit 220_2, the input end of the third switch unit 220_2 is connected to the first level signal, and the output end of the third switch is electrically connected to one end of the second resistor R2_2 , the other end of the second resistor R2_2 is electrically connected to the power supply pin, and the control end of the third switch unit 220_2 is controlled by the hardware or software of the system circuit 200_2. In this embodiment, the first level signal is a pulse signal, the high level of the pulse signal is, for example, the voltage of the battery 300_2, and the low level of the pulse signal is, for example, 0V. However, the present application is not limited thereto, and in other embodiments of the present application, the first level signal may be 0V, that is, ground, which is the system ground here. In this embodiment, under normal conditions, the third switch unit 220_2 is turned off, and the reset output terminal 210_2 is in a high-impedance state. At this time, the voltage signal received by the power supply terminal VDD_2 is only affected by the battery 300_2, not by the battery 300_2. Influence of the reset output 210_2 of the battery protection circuit 100_2. When the electronic device fails, the user can control the third switch unit 220_2 to turn off through software or hardware. Since the first level signal is a pulse signal, when the reset output terminal 210_2 also outputs a pulse signal, when the reset output terminal 210_2 is high Normally, the voltage at the power supply terminal VDD_2 is the voltage of the battery 300_2. When the reset output terminal 210_2 is 0V, the first resistor R1_2 and the second resistor R2_2 divide the voltage of the battery 300_2. The voltage at the power supply terminal VDD_2 is higher than that of the battery 300_2. The voltage should be low, in this embodiment, it is half the voltage of the battery 300_2, so the voltage at the power supply terminal VDD_2 is also a pulse voltage, the high level of the pulse voltage of the power supply terminal VDD_2 is the voltage of the battery 300_2, and the low level is the battery 300_2 half the voltage. In this embodiment, the battery protection circuit 100_2 further includes a pulse counting unit 550 and a reset timing unit 520_2. The pulse counting unit 550 outputs a high level signal under normal conditions, the power supply terminal VDD_2 is electrically connected to the pulse counting unit 550, the output terminal of the reset counting unit is electrically connected to the reset timing unit 520_2, and the output terminal of the reset timing unit 520_2 is electrically connected to the control unit 160_2 electrical connection. When the power supply terminal VDD_2 also outputs a pulse signal due to the reset output terminal 210_2 outputting a pulse signal, the pulse counting unit 550 counts the pulses, and the pulse counting unit 550 triggers the counting with a falling edge. When the number of pulses received in the third preset time period is greater than or equal to the second preset number, the output signal of the pulse counting unit 550 changes from a high level to a low level, and the low level at this time is the reset shutdown signal, After the control unit 160_2 receives the reset turn-off signal, it controls the first switch unit 180_2 to turn off so that the battery 300_2 stops supplying power to the system circuit 200_2. For the reset on signal, the control unit 160_2 controls the first switch unit 180_2 to turn on after receiving the reset on signal, where the reset on signal is a high level signal. The first preset time period, the third preset time period and the second preset number are preset by the battery protection circuit 100_2, and the first preset time period and the third preset time period are, for example, 16ms, 20ms, 32ms etc., the second predetermined number is, for example, 3, 4, 5, etc., so that the design can prevent false triggering. In addition, in other embodiments of the present application, the output terminal of the pulse counting unit 550 outputs a low level under normal conditions, and at this time, the high level is the reset turn-off signal, and the low level is the reset turn-on signal. In this embodiment, the pulse counting unit 550 is provided separately from the reset timing unit 520_2. In addition, in other embodiments of the present application, the pulse counting unit 550 may also be integrated with the reset timing unit 520_2.

2. In an embodiment of the present application, please refer to FIG. 11 , FIG. 15 and FIG. 16 . In this embodiment, the battery protection circuit 100_2 further includes a start verification unit 410_2 , a reset unit 420_2 and a reset timing unit 430_2 . The initial verification unit 410_2 and the reset unit 420_2 are respectively directly or indirectly electrically connected to the power supply terminal VDD_2. The initial verification unit 410_2 is also electrically connected to the reset unit 420_2, and the reset unit 420_2 is electrically connected to the reset timing unit 430_2. The output terminal is electrically connected to the control unit 160_2 , where the reset unit 420_2 is the pulse counting unit 550 . When the initial verification unit 410_2 receives a continuous low-level signal for a predetermined duration, for example, the third switch unit 220_2 is closed and the first-level signal generates a continuous low-level signal at this stage, at this time, the first-level signal is 0V, that is, connected to the system ground, the verification unit passes the verification, and the verification unit sends a detection signal to the reset unit 420_2 to tell the reset unit 420_2 to start detecting the signal on the power supply terminal VDD_2. When the reset unit 420_2 detects the signal within the second preset time period When the number of received pulses is greater than or equal to the first predetermined number, a reset turn-off signal is triggered, for example, the first level signal is a pulse signal at this stage, and the control unit 160_2 controls the first switch unit 180_2 to turn off the reset turn-off signal after receiving the reset turn-off signal. turn on to make the battery 300_2 stop supplying power to the system circuit 200_2, when the reset timing unit 430_2 counts the first switch unit 180_2 disconnecting for a first preset time period and then generates a reset turn-on signal, the control unit 160_2 controls the first switch after receiving the reset turn-on signal Unit 180_2 is turned on. In this embodiment, please refer to FIG. 15 and FIG. 16 in combination, the reset turn-off signal is a low-level signal, the reset-on signal is a high-level signal, and the first predetermined number is, for example, 5, 3, 4, 6, 7, 8 pulses, the first preset time period and the second preset time period are, for example, 16ms, 20ms, 32ms, and so on. In this embodiment, when the initial verification unit 410_2 does not send the detection signal to the reset unit 420_2, the reset unit 420_2 does not detect the signal on the power supply terminal VDD_2, that is, the detection signal is used to trigger the reset unit 420_2 to perform the power supply terminal. The signal on VDD_2 is detected. In this embodiment, through the settings of the initial verification unit 410_2, the reset unit 420_2 and the reset timing unit 430_2, false triggering of the reset action can be greatly avoided. In addition, in other embodiments of the present application, when the supply of the reset on signal is stopped, it is the reset off signal at this time, that is, the reset off signal does not need to be additionally generated.

In addition, in order to further prevent false triggering, in other embodiments of the present application, referring to FIG. 17 , the battery protection circuit 100_2 further includes a comparator 440_2 . The first input terminal of the comparator 440_2 is electrically connected to the power supply terminal VDD_2, and the second input terminal of the comparator 440_2 is connected to a reference voltage. The voltage value of the reference voltage is relative to the power supply ground terminal GND_2. The output terminals of 440_2 are respectively electrically connected to the initial verification unit 410_2 and the reset unit 420_2. Here, through the setting of the comparator 440_2, the signal of the power supply terminal VDD_2 can be shaped to reduce the disturbance of the voltage and further prevent false triggering; at the same time, since the voltage on the reset output terminal 210_2 is relative to the system ground terminal VM_2, the power supply The voltage of the terminal VDD_2 is also relative to the system ground terminal VM_2, and the reference voltage is relative to the power ground terminal GND_2, so that the voltage signal of the power supply terminal VDD_2 can be uniformly converted to the relative power ground terminal GND_2, so as to prevent the voltage signal of the power supply terminal VDD_2 from changing back and forth. cause problems. Here, the comparator 440_2 may be a comparator inherent in the battery protection circuit 100_2, or may be a newly added comparator.

3. In another embodiment of the present application, please refer to FIG. 11 , FIG. 18 and FIG. 19 , the battery protection circuit 100_2 further includes a reset timing unit 610_2 . Here, the power supply terminal VDD_2 is at a high level by default, the reset timing unit 610_2 outputs a high level signal under normal conditions, the power supply terminal VDD_2 is electrically connected to the reset timing unit 610_2, and the output terminal of the reset timing unit 610_2 is connected to the control unit 160_2 electrical connection. When the voltage signal received by the power supply terminal VDD_2 changes to a low level due to the change of the reset output terminal 210_2 signal, that is, when the signal received by the power supply terminal VDD_2 changes from a high level to a low level, the reset timing unit 610_2 Trigger timing, reset timing unit 610_2 triggers timing with a falling edge, when the duration of the low level signal received by reset timing unit 610_2 is greater than or equal to the fourth preset time period, the output signal of reset timing unit 610_2 changes from high level to low level At this time, the low level signal is the reset turn-off signal. After receiving the reset turn-off signal, the control unit 160_2 controls the first switch unit 180_2 to turn off so that the battery 300_2 stops supplying power to the system circuit 200_2. When the timing unit is reset 610_2 generates a reset turn-on signal after the first switch unit 180_2 is turned off for a first preset time period, and the control unit 160_2 controls the first switch unit 180_2 to turn on after receiving the reset turn-on signal, where the reset turn-on signal is a high level signal. The fourth preset time period is preset by the battery protection circuit 100_2, and the fourth preset time period is, for example, 10 seconds, 5 seconds, 3 seconds, 1 second, etc. This design can prevent false triggering. In addition, in other embodiments of the present application, the output terminal of the reset timing unit 610_2 outputs a low-level signal under normal conditions, and at this time, the high-level signal is the reset-off signal, and the low-level signal is the reset-on signal. In this embodiment, the reset timing unit 610_2 is provided separately from the control unit 160_2. In addition, in other embodiments of the present application, the reset timing unit 610_2 may also be integrated into the control unit 160_2.

In this embodiment, please continue to refer to FIG. 11 , the battery protection circuit 100_2 further includes a system ground terminal VM_2, the system ground terminal VM_2 is used for electrical connection with the system circuit 200_2, and the system ground terminal VM_2 is also used for charging. In this embodiment, a first switch unit 180_2 is disposed between the system ground and the power ground terminal GND_2.

In this embodiment, the battery protection circuit 100_2 is located on the same chip, that is, the battery protection circuit 100_2 is made into a system-on-chip as a whole. The system-on-chip (SOC) is a technology commonly used in the field of integrated circuits. Multiple integrated circuits with specific functions are combined on a chip to form a system or product, which contains the completed hardware system and the embedded software it carries. SoCs have obvious advantages in performance, cost, power consumption, reliability, as well as life cycle and scope of use. In addition, in other embodiments of the present application, please refer to FIG. 12 , the units of the battery protection circuit 100_2 except the first switch unit 180_2 are all implemented on the same chip, that is, the battery protection circuit 100_2 except the first switch unit 180_2 The other units are made into a system-on-chip as a whole. In addition, in other embodiments of the present application, the first resistor R1_2 and the capacitor C in FIG. 11 can also be implemented in a system-on-chip.

It should be understood that references herein to "a plurality" means two or more. Other embodiments of the present application will readily occur to those skilled in the art upon consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses or adaptations of this application that follow the general principles of this application and include common knowledge or conventional techniques in the technical field not disclosed in this application . The specification and examples are to be regarded as exemplary only, with the true scope and spirit of the application being indicated by the following claims.

It should be noted that, each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. For the same and similar parts of each embodiment, refer to each other. Can. As for the apparatus embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and reference may be made to the partial description of the method embodiment for related parts.

The above disclosures are only the preferred embodiments of the present application, and of course, the scope of the rights of the present application cannot be limited by this. Therefore, equivalent changes made according to the claims of the present application are still within the scope of the present application.

Claims

A battery protection circuit is characterized by comprising: a power supply terminal, a power ground terminal, an overcharge voltage protection unit, an overdischarge voltage protection unit, a discharge overcurrent protection unit, a charge overcurrent protection unit, a control unit, and a first switch unit, wherein the power supply terminal and the power ground terminal are respectively used for electrical connection with the battery, and the first switch unit is used to control the battery to supply power to the system circuit;

Wherein, the battery protection circuit further includes a reset input terminal, the reset input terminal is used for electrical connection with the system circuit, and when the reset input terminal receives the first signal, the control unit controls the first switch unit to be disconnected to make the battery The power supply to the system circuit is stopped, and after the first switch unit is turned off for a first preset time period, the control unit controls the first switch unit to be turned on to restore the battery to supply power to the system circuit.
The battery protection circuit according to claim 1, wherein when the reset input terminal receives the first signal, the battery protection circuit is triggered to generate a reset control signal and send it to the control unit, and the control unit controls the control after receiving the reset control signal. The first switch unit is turned off to stop the battery from supplying power to the system circuit, and after the first switch unit is turned off for a first preset time period, the first switch unit is turned on to restore the battery to supply power to the system circuit.
The battery protection circuit of claim 2, wherein the reset control signal comprises a reset turn-off signal and a reset turn-on signal, the first signal comprises a first-stage signal and a second-stage signal, wherein the first The phase signal includes a continuous high-level signal or a continuous low-level signal, the second phase signal includes a pulse signal; the battery protection circuit includes a start verification unit, a reset unit and a reset timing unit, wherein the start The initial verification unit and the reset unit are respectively electrically connected to the reset input terminal, the initial verification unit is also electrically connected to the reset unit, the reset unit is electrically connected to the reset timing unit, and the reset timing unit is electrically connected. The output end of the unit is electrically connected to the control unit, and when the initial verification unit receives a continuous high level signal or a continuous low level signal for a predetermined duration, the verification unit sends a signal to the reset unit to enable the reset unit to detect the first signal, when the reset unit detects that the number of pulses received in the second preset time period is greater than or equal to the first predetermined number, triggers the generation of a reset turn-off signal to control the first switch unit to turn off, and when the reset timing unit times the first switch After the unit is disconnected for a first preset time period, a reset turn-on signal is generated to control the turn-on of the first switch unit.
The battery protection circuit according to claim 3, wherein the battery protection circuit further comprises a comparator, the first input terminal of the comparator is electrically connected to the reset input terminal, and the first input terminal is also connected via The first resistor is electrically connected to the system ground terminal, the second input terminal of the comparator is connected to a reference voltage, and the output terminal of the comparator is electrically connected to the initial verification unit and the reset unit respectively.
The battery protection circuit of claim 2, wherein the first signal comprises a pulse signal, the reset control signal comprises a reset turn-off signal and a reset turn-on signal, the battery protection circuit further comprises a pulse counting unit and a reset timing unit, the pulse counting unit is electrically connected to the reset input terminal, the output terminal of the reset timing unit is electrically connected to the reset timing unit, and the output terminal of the reset timing unit is electrically connected to the control unit. When the number of pulses received by the unit in the third preset time period is greater than or equal to the second predetermined number, a reset turn-off signal is triggered to control the first switch unit to be disconnected, and when the reset timing unit times the first switch unit to disconnect the first switch unit After a preset period of time, a reset turn-on signal is generated to control the turn-on of the first switch unit.
The battery protection circuit according to claim 2, wherein the first signal comprises a continuous high level signal or a continuous low level signal, the reset control signal comprises a reset turn-off signal and a reset turn-on signal, The battery protection circuit further includes a reset timing unit, the reset timing unit is electrically connected to the reset input terminal, and the duration of the high-level signal or the low-level signal received by the reset timing unit is greater than or equal to the fourth preset During the time period, a reset off signal is triggered to control the first switch unit to be turned off.
The battery protection circuit according to any one of claims 1-6, wherein the first signal is an encoded signal pre-agreed between the battery protection circuit and the system circuit.
The battery protection circuit according to any one of claims 1-6, wherein the first switch unit comprises a MOS transistor.
The battery protection circuit according to any one of claims 1 to 6, wherein the battery protection circuit is implemented on the same chip, or the battery protection circuit is implemented in all units except the first switch unit. on the same chip.
A battery assembly, characterized in that, comprising:

Battery;

The battery protection circuit according to any one of claims 1-9, wherein a power supply terminal and a power ground terminal of the battery protection circuit are respectively electrically connected to the battery, and the first switch unit of the battery protection circuit is used to control the The battery supplies power to the system circuit, and the reset input terminal of the battery protection circuit is used for electrical connection with the system circuit.
An electronic device, comprising:

The battery assembly of claim 10;

A system circuit, wherein the battery is controlled to supply power to the system circuit via a first switch unit of the battery protection circuit, and the system circuit is electrically connected to a reset input terminal of the battery protection circuit.
A battery protection circuit is characterized by comprising: a power supply terminal, a power ground terminal, a voltage protection unit, a current protection unit, a control unit, and a first switch unit, wherein the power supply terminal and the power ground terminal are respectively used for is electrically connected to the battery, and the first switch unit is used to control the battery to supply power to the system circuit;

The power supply terminal is also used for electrical connection with the reset output terminal of the system circuit. When the voltage signal received by the power supply terminal changes due to the change of the signal transmitted from the reset output terminal, the control unit controls the first A switch unit is turned off to stop the battery from supplying power to the system circuit, and the control unit controls the first switch unit to turn on after the first switch unit is turned off for a first preset time period to restore the battery to supply power to the system circuit.
The battery protection circuit according to claim 12, wherein the battery protection circuit comprises an initial verification unit, a reset unit and a reset timing unit, wherein the initial verification unit and the reset unit are respectively connected with the The power supply terminal is electrically connected, the initial verification unit is also electrically connected to the reset unit, the reset unit is electrically connected to the reset timing unit, and the output end of the reset timing unit is electrically connected to the control unit. When the initial verification unit receives a continuous high level or continuous low level signal for a predetermined duration, the verification unit sends a signal to the reset unit so that the reset unit detects the signal of the power supply terminal. When the number of pulses received within the preset time period is greater than or equal to the first predetermined number, a reset turn-off signal is triggered to control the first switch unit to turn off through the control unit, and when the reset timing unit times the first switch unit turns off the first preset After a set period of time, a reset turn-on signal is generated to control the first switch unit to turn on through the control unit.
The battery protection circuit according to claim 13, wherein the battery protection circuit further comprises a comparator, a first input terminal of the comparator is electrically connected to the power supply terminal, and a second input terminal of the comparator is electrically connected to the power supply terminal. The terminal is connected to a reference voltage, and the output terminals of the comparator are respectively electrically connected with the initial verification unit and the reset unit.
The battery protection circuit according to claim 12, wherein when the number of pulses received by the power supply terminal within the third preset time period is greater than or equal to the second preset number, the control unit controls the first switch unit to turn off turned on to stop the battery from supplying power to the system circuit, the control unit controls the first switch unit to turn on after the first switch unit is turned off for a first preset time period to restore the battery to supply power to the system circuit.
The battery protection circuit according to claim 15, wherein the battery protection circuit further comprises a pulse counting unit and a reset timing unit, the pulse counting unit is electrically connected to the power supply terminal, and the reset counting unit is The output terminal is electrically connected to the reset timing unit, and the output terminal of the reset timing unit is electrically connected to the control unit. When the number of pulses received by the pulse counting unit in the third preset time period is greater than or equal to the second predetermined number, the generation is triggered The reset turn-off signal is used to control the first switch unit to be turned off through the control unit. When the reset timing unit counts the first switch unit to turn off for a first preset time period, a reset turn-on signal is generated to control the first switch unit to turn on by the control unit.
The battery protection circuit according to claim 12, wherein when the duration of the high-level signal or the low-level signal received by the power supply terminal within a predetermined time period is greater than or equal to a fourth preset time period The control unit controls the first switch unit to be disconnected to stop the battery supplying power to the system circuit, and the control unit controls the first switch unit to be turned on after the first switch unit is disconnected for a first preset time period.
The battery protection circuit according to claim 17, wherein the battery protection circuit further comprises a reset timing unit, the reset timing unit is electrically connected to the power supply terminal, and the output terminal of the reset timing unit is connected to the power supply terminal. The control unit is electrically connected, and when the duration of the received high-level signal or low-level signal caused by the change of the reset output terminal signal caused by the reset timing unit is greater than or equal to the fourth preset time period, the reset turn-off signal is triggered to generate a reset turn-off signal. The first switch unit is controlled to be turned off, and a reset turn-on signal is generated to control the first switch unit to turn on after the reset timing unit counts the first switch unit being turned off for a first preset time period.
The battery protection circuit according to any one of claims 12 to 18, wherein the signal received by the power supply terminal from the reset output terminal is an encoded signal pre-agreed by the battery protection circuit and the system circuit.
The battery protection circuit according to any one of claims 12 to 18, wherein the first switch unit comprises a MOS transistor.
The battery protection circuit according to any one of claims 12 to 18, wherein the battery protection circuit is located on the same chip, or the units of the battery protection circuit except the first switch unit are located on the same chip on a chip.
A battery assembly, characterized in that, comprising:

Battery;

The battery protection circuit according to any one of claims 12-21, wherein the power supply terminal and the power ground terminal of the battery protection circuit are respectively electrically connected to the battery, and the first switch unit of the battery protection circuit is used to control the The battery supplies power to the system circuit, and the power supply terminal of the battery protection circuit is also used for electrical connection with the reset output terminal of the system circuit.
An electronic device, comprising:

The battery assembly of claim 22;

A system circuit, wherein the battery is controlled to supply power to the system circuit through a first switch unit of the battery protection circuit, and a reset output terminal of the system circuit is electrically connected to a power supply terminal of the battery protection circuit.
24. The electronic device of claim 23, wherein the reset output terminal of the system circuit is electrically connected to the power supply terminal of the battery protection circuit via a second resistor, and the reset output terminal causes the power supply when its signal changes. The voltage signal received by the power supply terminal is in a high-impedance state except for the time when the voltage signal changes.