CN112117799B

CN112117799B - Battery protection circuit, battery pack and electronic device

Info

Publication number: CN112117799B
Application number: CN202010968313.1A
Authority: CN
Inventors: 宋利军; 宋朋亮; 徐茂生
Original assignee: Xi'an Wenxian Semiconductor Technology Co ltd
Current assignee: Xi'an Wenxian Semiconductor Technology Co ltd
Priority date: 2020-09-15
Filing date: 2020-09-15
Publication date: 2022-10-21
Anticipated expiration: 2040-09-15
Also published as: CN112117799A

Abstract

The application provides a battery protection circuit, includes: the battery protection circuit comprises a power supply end, a power grounding end, a voltage protection unit, a current protection unit, a control unit and a first switch unit, wherein the power supply end and the power grounding end are respectively used for being electrically connected with a battery, and the first switch unit is used for controlling the battery to supply power to a system circuit; the power supply end is further used for being electrically connected with a reset output end of the system circuit, when the voltage signal received by the power supply end changes due to the change of the signal of the reset output end, 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 switched off for a first preset time period, the control unit controls the first switch unit to be switched on so that the battery can be recovered to supply power to the system circuit. The application also provides a battery pack and an electronic device. The application has the advantages that: the reset of the electronic device can be realized at low cost.

Description

Battery protection circuit, battery pack and electronic device

Technical Field

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

Background

When a system of an existing electronic device, such as a computer, a mobile phone, etc., has a problem, such as a failure of a blue screen, etc., a user generally presses a power key for a long time to reset and restart the electronic device, and when the electronic device is restarted, a program is reloaded to remove the failure and restart the electronic device.

Referring to fig. 1, an 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 fault, a user triggers a reset signal, the reset IC chip 940 receives the reset signal and controls the second switch unit 950 to be turned off, the battery 910 stops supplying power to the system circuit 930, and after a predetermined time elapses, the reset IC chip 940 controls the second switch unit 950 to be turned on to recover the power supply to the system circuit 930, and the electronic device restarts.

However, the conventional electronic device needs to install a separate reset IC chip 940 and a separate second switch unit 950, and particularly, the reset IC chip 940 itself has a high cost, which results in a high cost of implementing the reset restart function of the electronic device.

Disclosure of Invention

The present disclosure provides a battery protection circuit, a battery pack 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 an embodiment of the present application provides a battery protection circuit, including: the power supply protection circuit comprises a power supply end, a power grounding end, a voltage protection unit, a current protection unit, a control unit and a first switch unit, wherein the power supply end and the power grounding end are respectively used for being electrically connected with a battery, and the first switch unit is used for controlling the battery to supply power to a system circuit;

the power supply end is also used for being electrically connected with a reset output end of the system circuit, when the voltage signal received by the power supply end changes due to the change of the signal transmitted by the reset output end, 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 switched off for a first preset time period, the control unit controls the first switch unit to be switched on so that the battery recovers 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, where the initial verification unit and the reset unit are electrically connected to the power supply terminal, the initial verification unit is further electrically connected to the reset unit, the reset unit is electrically connected to the reset timing unit, an 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 time period, the verification unit sends a signal to the reset unit to enable the reset unit to detect a signal of the power supply terminal, when the reset unit detects that a number of pulses received in a second predetermined time period is greater than or equal to a first predetermined number, the reset unit is triggered to generate a reset off signal to control the first switch unit to be turned off through the control unit, and when the reset timing unit times that the first switch unit is turned off for the first predetermined time period, the reset on signal is generated to control the first switch unit to be turned on through the control unit.

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

Optionally, when the number of pulses received by the power supply end in the third preset time period is greater than or equal to the second preset number, the control unit controls the first switch unit to be turned off to stop the battery from supplying power to the system circuit, and after the first switch unit is turned off for the first preset time period, the control unit controls the first switch unit to be turned on to recover the battery from supplying power 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 end, an output end of the reset counting unit is electrically connected to the reset timing unit, an output end of the reset timing unit is electrically connected to the control unit, when the pulse count unit receives a pulse number greater than or equal to a second predetermined number in a third preset time period, the pulse counting unit is triggered to generate a reset turn-off signal to control the first switch unit to be turned off through the control unit, and when the reset timing unit times the first switch unit to be turned off for a first preset time period, the pulse counting unit generates a reset turn-on signal to control the first switch unit to be turned on through the control unit.

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

Optionally, the battery protection circuit further includes a reset timing unit, the reset timing unit is electrically connected to the power supply terminal, an output terminal of the reset timing unit is electrically connected to the control unit, when the reset timing unit changes a signal at the reset output terminal to cause a duration of a received high level signal or a received low level signal to be greater than or equal to a fourth preset time period, the reset timing unit is triggered to generate a reset off signal to control the first switch unit to be turned off, and when the reset timing unit times that the first switch unit is turned off for the first preset time period, the reset on signal is generated to control the first switch unit to be turned on.

Optionally, the power supply terminal receives a signal from the reset output terminal, and the signal is a coded signal of a battery protection circuit and a system circuit pre-protocol.

Optionally, the first switching unit includes a MOS transistor.

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

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

in the battery protection circuit, the power supply end and the power ground end of the battery protection circuit are respectively electrically connected with the battery, the first switch unit of the battery protection circuit is used for controlling the battery to supply power to the system circuit, and the power supply end of the battery protection circuit is also used for being electrically connected with the reset output end of the system circuit.

A third aspect of embodiments of the present application provides an electronic apparatus, including: the above battery module;

the system circuit is controlled by the battery through the first switch unit of the battery protection circuit to supply power to the system circuit, and the reset output end of the system circuit is electrically connected with the power supply end 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 is in a high impedance state at a time other than a change of a voltage signal received by the power supply terminal due to a change of a signal of the reset output terminal.

The embodiment of the application has the following beneficial effects: the power supply end is also used for being electrically connected with the reset output end of the system circuit, when the voltage signal received by the power supply end changes due to the change of the signal of the reset output end, 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 switched off for a first preset time period, the control unit controls the first switch unit to be switched on so that the battery can be recovered to supply power to the system circuit. Therefore, the reset restart function is realized by utilizing the existing first switch unit, a terminal does not need to be added, and the reset IC chip and the second switch unit matched with the reset IC chip do not need to be independently added, so that the cost is greatly reduced, and the competitiveness of the electronic device is increased.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a block diagram of a prior art electronic device implementing a reset restart;

FIG. 2 is a schematic circuit block diagram of an electronic device according to an embodiment of the present application;

FIG. 3 is a schematic circuit block diagram of an electronic device according to another embodiment of the present application;

FIG. 4 is a schematic diagram of an electrical connection between a power supply terminal and a control unit according to an embodiment of the present application;

FIG. 5 is a waveform diagram of the signal received by the power supply terminal of the power supply of FIG. 4 and the output signal of the reset timing unit;

FIG. 6 is a schematic diagram of an electrical connection between a power supply terminal and a control unit according to another embodiment of the present application;

FIG. 7 is a waveform diagram of signals received by the power supply terminal of the power supply of FIG. 6 and a reset unit;

FIG. 8 is a schematic diagram of the power supply terminal of another embodiment of the present application electrically connected to the control unit;

FIG. 9 is a schematic diagram of an electrical connection between a power supply terminal and a control unit according to yet another embodiment of the present application;

FIG. 10 is a waveform diagram of the signals received by the power supply terminal of the power supply of FIG. 9 and the output signal of the reset timing unit;

description of the figure numbers:

100. 920-a battery protection circuit; 200. 930-system circuitry; 300. 910-a battery; VDD-power supply terminal; GND-power ground; VM-System ground; 110-an overcharge voltage protection unit; 120-charging overcurrent protection unit; 130-discharge overcurrent protection unit; 140-reference voltage generating unit; 150-a frequency generation unit; 160-a control unit; 170-charge detection unit; 180-a first switching unit; 190-an over-discharge voltage protection unit; 210-a reset output; 220-a third switching unit; 410-an initial verification unit; 420-a reset unit; 430. 520, 610-reset timing unit; 440-a comparator; 510-a pulse counting unit; r1-a first resistor; r2-a second resistor; c-capacitance; 940-reset IC; 950-a second switching 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, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms "comprising" and "having," and any variations thereof, as appearing in the specification, claims, and drawings of the present application, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or modules is not limited to only those steps or elements but may alternatively include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. Furthermore, the terms "first," "second," and "third," etc. are used to distinguish between different objects and are not used to describe a particular order.

The embodiment of the application provides an electronic device, and the electronic device is, for example, a bluetooth headset, a mobile phone, a tablet computer, a notebook 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 a circuit composed of a microprocessor, a camera driving circuit, an image processor, and the like, the system circuit 200 is electrically connected to the battery assembly, and the battery assembly is used for supplying power to the system circuit 200. The battery pack includes a battery 300 and a battery protection circuit 100, the battery protection circuit 100 is electrically connected to the positive and negative electrodes 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 plays a role in protection and reset, for example, when the battery 300 is overcharged or overdischarged, the battery protection circuit 100 protects the battery 300. In the present embodiment, the number of the battery 300 is one or more, and when the number of the battery 300 is plural, the plural batteries 300 may be connected in parallel or in series or in parallel, and may be mixed, the battery 300 is preferably a lithium battery 300, the capacity of the battery 300 is, for example, 10mAH to 80mAH, for example, 10mAH, 20mAH, 30mAH, 40mAH, 50mAH, 60mAH, 70mAH, and 80mAH, the size of the battery 300 with such a capacity is small, and preferably, the capacity of the battery 300 is 20mAH to 40mAH, and the battery 300 has a smaller volume and may be conveniently configured in a small electronic device, such as a wireless bluetooth headset. In addition, in this embodiment, a first resistor R1 and a capacitor C are further disposed between the battery 300 and the battery protection circuit 100, and the first resistor R1 and the capacitor C are disposed for filtering. In addition, in other embodiments of the present application, referring to fig. 3, the capacitor C may not be disposed between the battery 300 and the battery protection circuit 100. In addition, in other embodiments of the present application, other circuits or electronic elements may be disposed between the battery 300 and the battery protection circuit 100.

In the present embodiment, with reference to fig. 2, the battery protection circuit 100 includes a power supply terminal VDD, a power ground terminal GND, a voltage protection unit, a current protection unit, a reference voltage generation unit 140, a frequency generation unit 150, a control unit 160, a charge detection unit 170, and a first switch unit 180. In this embodiment, the voltage protection unit includes an overcharge voltage protection unit 110 and/or an overdischarge voltage protection unit 190, and the current protection unit includes a discharge overcurrent protection unit 130 and/or a charge overcurrent protection unit 120. 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 this embodiment, the power supply terminal VDD and the power ground terminal GND are respectively used for electrically connecting with the positive electrode and the negative electrode of the battery 300, so that the battery 300 can supply power to the battery protection circuit 100, and meanwhile, the battery 300 forms a loop via the battery protection circuit 100 and the system circuit 200 to supply power to the system circuit 200.

In the embodiment, the overcharge voltage protection unit 110 is used to protect the battery 300 when detecting that the charge voltage is too high during the charging process of the battery 300, for example, stopping charging the battery 300, and so on, so as to prevent the battery 300 from being damaged or causing safety problems.

In the embodiment, the over-discharge voltage protection unit 190 is used for protecting the battery 300 when detecting that the discharge voltage is too low during the discharge process of the battery 300, for example, controlling the battery 300 to discharge only to the minimum extent, and generally stopping the power supply to the system circuit 200 and stopping the power supply to the circuits of the battery protection circuit 100 except the charge detection circuit, so as to prevent the battery 300 from being over-discharged and causing permanent damage to the battery 300.

In the embodiment, the discharge overcurrent protection unit 130 is used for protecting the battery 300 when detecting that the discharge current is too large during the discharge of the battery 300, for example, the battery 300 stops discharging, and the like, so as to prevent the battery 300 from being permanently damaged or having a safety problem due to the too large discharge current. In the present embodiment, the discharge overcurrent protection unit 130 includes a plurality of sub-units, each of which is electrically connected to the control unit 160, and each of which is used for processing different discharge currents, and three sub-units are provided in the figure.

In the embodiment, the charging overcurrent protection unit 120 is used for protecting the battery 300 when detecting that the charging current is too large during the charging process of the battery 300, for example, the battery 300 stops charging, and the like, so as to prevent the battery 300 from being permanently damaged or causing a safety problem due to the too large charging current.

In the present embodiment, the reference voltage generating unit 140 is configured to generate a reference voltage required by the battery protection circuit 100, the frequency generating unit 150 is configured to generate different frequencies, and the control unit 160 is electrically connected to the overcharge voltage protection unit 110, the overdischarge voltage protection unit 190, the discharge overcurrent protection unit 130, the reference voltage generating unit 140, the frequency generating unit 150, the charge detecting unit 170, the first switching unit 180, and the like. In this embodiment, the overcharge voltage protection unit 110, the overdischarge voltage protection unit 190, the discharge overcurrent protection unit 130, the charge overcurrent protection unit 120, the reference voltage generation unit 140, the frequency generation unit 150, and the control unit 160 are conventional circuits in the art, and are not described herein again.

In the present embodiment, 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 this embodiment, the first switch unit 180 includes a switch transistor and a substrate control circuit, the switch transistor is an MOS transistor, a control end of the switch transistor is electrically connected to the control unit 160, the substrate control circuit is electrically connected to the control unit 160, and the substrate control circuit is configured to implement correct bias of a substrate of the switch transistor. However, the present application is not limited thereto, and in other embodiments of the present application, the first switch unit 180 may further include a charge switch and a discharge switch, where the charge switch and the discharge switch are both MOS transistors, and the charge switch and the discharge switch are respectively electrically connected to the control unit 160. In addition, in other embodiments of the present application, the first switch unit 180 may also be implemented in other forms, for example, only includes 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, the input terminal of the first switch unit 180 is electrically connected to the battery 300, for example, electrically connected to the power ground GND of the battery protection circuit 100, and the output terminal of the first switch unit 180 is electrically connected to 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 whether the battery 300 supplies power to the system circuit 200 by controlling the first switch unit 180.

In this embodiment, please refer to fig. 2, the power supply terminal VDD is further electrically connected to the reset output terminal 210 of the system circuit 200, so that the power supply terminal VDD is divided into two branches, one branch enters the battery protection circuit 100 via the power supply terminal VDD, and the other branch enters the system circuit 200 via the reset output terminal 210, when the system circuit 200 is controlled to change the signal of the reset output terminal 210, the voltage signal of the power supply terminal VDD changes accordingly, at this time, 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 after the first switch unit 180 is turned off for a first preset time period, the control unit 160 controls the first switch unit 180 to be turned on (turned on) to resume the battery 300 from supplying power to the system circuit 200. In this embodiment, the control system circuit 200 may change the signal at the reset output 210 through software or hardware, and when the control system circuit is implemented through hardware, the control system circuit may be implemented through, for example, a power key or a voice key of an electronic device, for example, by pressing the power key, and the voice key at the same time, so as to change the signal at the reset output 210.

In this embodiment, when the electronic device encounters a fault and needs to be reset, at this time, the user controls the system circuit 200 to change a signal at the reset output end 210 of the system circuit 200, so that the voltage signal of the power supply terminal VDD changes accordingly, at this time, 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, at this time, the system circuit 200 is completely powered off, the data in the system circuit 200 is cleared, after the first switch unit 180 is turned off for a first preset time period, the control unit 160 controls the first switch unit 180 to be turned on to recover the battery 300 from supplying power to the system circuit 200, at this time, the system circuit 200 is powered again, the system circuit 200 reloads the data and the program, and the electronic device realizes normal reset and restart. The reset restart function is realized by using the existing first switch unit 180 in the embodiment, and the reset IC chip and the second switch unit matched with the reset IC chip are not required to be separately added, so that the cost is greatly reduced, and the competitiveness of the electronic device is increased.

In this embodiment, the power supply terminal VDD receives the signal from the reset output terminal 210 as a digital coded signal, which causes the voltage signal received by the power supply terminal VDD to change, and since the battery 300 outputs a dc voltage, the signal received by the power supply terminal VDD from the reset output terminal 210 and the signal received by the battery 300 are also digital coded signals, and the digital coded signal output by the power supply terminal VDD and the digital coded signal output by the reset output terminal 210 correspond to each other one by one. The coded signal output by the reset output terminal 210 is well agreed in advance when the battery protection circuit 100 and the system circuit 200 are designed, and when the power supply terminal VDD receives the coded signal, the battery protection circuit 100 can recognize the coded signal. For example, the encoded signal includes two periods of time: the first time period is a low-level signal, the second time period is a pulse signal of a predetermined number, where the low-level signal is used to trigger an element corresponding to the battery protection circuit 100 to activate, for example, to tell the element corresponding to the battery protection circuit 100 to prepare to time or count, and then the element corresponding to the battery protection circuit 100 counts or counts the received pulse signal (for example, different pulse durations are different), when a preset requirement is met, the control unit 160 controls the first switch unit 180 to turn off to stop the battery 300 from supplying power to the system circuit 200, and after the first switch unit 180 turns off for the first preset time period, the control unit 160 controls the first switch unit 180 to turn on to resume the battery 300 from supplying power to the system circuit 200; when the pulse number does not meet the preset requirement, the corresponding element of the battery protection circuit 100 returns to the state where activation is not started. In addition, in other embodiments of the present application, the first time period is a predetermined number of pulse signals, and the second time period is a low level signal or a high level signal of a predetermined duration. Since the coded signal is a coded signal of a protocol of the battery protection circuit 100 and the system circuit 200, the specific form of the coded signal is not limited, a complex coded signal or a simple coded signal may be used, and the coded signal of the battery protection circuit 100 and the system circuit 200 which have been previously agreed may be recognized by the battery protection circuit 100. In addition, when the coded signal is relatively complex, the battery protection circuit 100 is reliable and safe, and can prevent false triggering.

In this embodiment, the following ways to realize the change of the signal at the reset output 210 of the system circuit 200 and the change of the voltage signal received by the power supply terminal VDD are provided, and are described below. Of course, the manner of implementing the change of the signal at the reset output 210 of the system circuit 200 to cause the change of the voltage signal received at the power supply terminal VDD is not limited to the following, and in other embodiments of the present application, a person skilled in the art may also set other conventional circuits to implement the change of the signal at the reset output 210 of the system circuit 200 to cause the change of the voltage signal received at the power supply terminal VDD.

1. In an embodiment of the present application, referring to fig. 2, 4 and 5, when the number of pulses received by the power supply terminal VDD in the third preset time period is greater than or equal to the second predetermined number, 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 after the first switch unit 180 is turned off for the first preset time period, the control unit 160 controls the first switch unit 180 to be turned on to resume the battery 300 from supplying power to the system circuit 200.

Specifically, the reset output terminal 210 is electrically connected to the power supply terminal VDD via the second resistor R2, the second resistor R2 has the same resistance as the first resistor R1, the reset output terminal 210 is in a high-impedance state in a normal state,

specifically, in the present embodiment, the system circuit 200 includes a third switch unit 220, an input terminal of the third switch unit 220 is connected to the first level signal, an output terminal of the third switch unit is electrically connected to one end of a second resistor R2, another end of the second resistor R2 is electrically connected to the power supply pin, and a control terminal of the third switch unit 220 is controlled by hardware or software of the system circuit 200. In the present 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, 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, i.e., ground, which is a system ground. In the present embodiment, under a normal condition, the third switching unit 220 is turned off, and the reset output terminal 210 is in a high impedance state, and the voltage signal received by the power supply terminal VDD is only affected by the battery 300 and is not affected by the reset output terminal 210 of the battery protection circuit 100. When the electronic device fails, a user may control the third switching unit 220 to turn off through software or hardware, because the first level signal is a pulse signal, the reset output terminal 210 also outputs the pulse signal, when the reset output terminal 210 is at a high level, the voltage at the power supply terminal VDD is the voltage of the battery 300, when the reset output terminal 210 is at 0V, the voltage of the battery 300 is divided by the first resistor R1 and the second resistor R2, the voltage at the power supply terminal VDD is lower than the voltage of the battery 300, which is half the voltage of the battery 300 in this embodiment, so that the voltage at the power supply terminal VDD is also a pulse voltage, the high level of the pulse voltage at the power supply terminal VDD is the voltage of the battery 300, and the low level is half the voltage of the battery 300. In the present embodiment, the battery protection circuit 100 further includes a pulse counting unit 550 and a reset timing unit 520. The pulse counting unit 550 outputs a high level signal under a general condition, the power supply terminal VDD 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, and the output terminal of the reset timing unit 520 is electrically connected to the control unit 160. When the power supply end VDD outputs a pulse signal due to the reset output end 210 outputting the pulse signal, the pulse counting unit 550 counts the pulse, the pulse counting unit 550 triggers counting at a falling edge, when the pulse count unit 550 receives a pulse number greater than or equal to a second predetermined number in a third predetermined time period, the output signal of the pulse counting unit 550 is converted from a high level to a low level, the low level is a reset off signal, the control unit 160 receives the reset off signal and then controls the first switch unit 180 to be turned off so that the battery 300 stops supplying power to the system circuit 200, when the reset timing unit 520 times the first switch unit 180 is turned off for the first predetermined time period, the reset on signal is generated, and the control unit 160 receives the reset on signal and then controls 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 second preset number are preset by the battery protection circuit 100, the first preset time period and the third preset time period are, for example, 16ms, 20ms, 32ms and the like, and the second preset number is, for example, 3, 4, 5 and the like, so that the design can prevent false triggering. In addition, in other embodiments of the present application, the output end of the pulse counting unit 550 outputs a low level under a normal condition, where the high level is a reset off signal and the low level is a reset on signal. In the present embodiment, the pulse counting unit 550 is provided separately from the reset timing unit 520. 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. In an embodiment of the present application, please refer to fig. 2, fig. 6, and fig. 7, in the embodiment, the battery protection circuit 100 further includes a start verification unit 410, a reset unit 420, and a reset timing unit 430. The start verification unit 410 and the reset unit 420 are respectively and directly or indirectly electrically connected to the power supply terminal VDD, the start verification unit 410 is further electrically connected to the reset unit 420, the reset unit 420 is electrically connected to the reset timing unit 430, the output terminal of the reset timing unit 430 is electrically connected to the control unit 160, and the reset unit 420 is a pulse counting unit 550. When the start verifying unit 410 receives a continuous low level signal of a predetermined duration, for example, the third switching unit 220 is turned on 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, when the verifying unit verifies that the verification unit passes, the verifying unit sends a detection signal to the resetting unit 420 to tell the resetting unit 420 to start detecting the signal on the power supply terminal VDD, when the resetting unit 420 detects that the number of pulses received in the second preset time period is greater than or equal to the first predetermined number, the generation of a reset off signal is triggered, for example, the first level signal is a pulse signal at this stage, the control unit 160 receives the reset off signal and then controls the first switching unit 180 to be turned off so that the battery 300 stops supplying power to the system circuit 200, when the reset timing unit 430 times that the first switching unit 180 is turned off for the first preset time period, the control unit 160 receives the reset on signal and then controls the first switching unit 180 to be turned on. In this embodiment, please refer to fig. 6 and fig. 7 in combination, the reset off signal is a low level signal, the reset on signal is a high level signal, the first predetermined number of pulses is, for example, 5, 3, 4, 6, 7, 8, etc., and the first and second predetermined time periods are, for example, 16ms, 20ms, 32ms, etc. In this embodiment, when the start verification unit 410 does not send the detection signal to the reset unit 420, the reset unit 420 does not detect the signal on the power supply terminal VDD, that is, the detection signal is used to trigger the reset unit 420 to detect the signal on the power supply terminal VDD. In the present embodiment, by setting the start verifying unit 410, the resetting unit 420 and the resetting timing unit 430, the false triggering of the resetting action can be greatly avoided. In addition, in other embodiments of the present application, when the supply of the reset on signal is stopped, the reset off signal is the reset off signal, that is, the reset off signal does not need to be generated additionally.

In addition, in order to further prevent false triggering, in other embodiments of the present application, please refer to fig. 8, the battery protection circuit 100 further includes a comparator 440. The first input terminal of the comparator 440 is electrically connected to the power supply terminal VDD, 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 electrically connected to the initial verification unit 410 and the reset unit 420, respectively. Here, through the arrangement of the comparator 440, the signal of the power supply end VDD of the power supply can be shaped, so that the disturbance of voltage is reduced, and the false triggering is further prevented; meanwhile, the voltage on the reset output end 210 is relative to the system ground terminal VM, so that the voltage of the power supply end VDD is also relative to the system ground terminal VMVM, and the reference voltage is relative to the power supply ground terminal GND, so that the voltage signal of the power supply end VDD can be uniformly converted into the voltage signal of the relative power supply ground terminal GND, and the problem caused by the back-and-forth variation of the voltage signal of the power supply end VDD is avoided. Here, the comparator 440 may be a comparator of the battery protection circuit 100 itself or may be a newly added comparator.

3. In another embodiment of the present application, referring to fig. 2, 9 and 10, the battery protection circuit 100 further includes a reset timing unit 610. Here, the power supply terminal VDD is set to be high level by default, the reset timing unit 610 outputs a high level signal under a normal condition, the power supply terminal VDD is electrically connected to the reset timing unit 610, and an output terminal of the reset timing unit 610 is electrically connected to the control unit 160. When the voltage signal received by the power supply terminal VDD changes to a low level due to a change of the signal at the reset output terminal 210, that is, the signal received by the power supply terminal VDD changes from a high level to a low level, the reset timing unit 610 triggers timing, the reset timing unit 610 performs falling edge triggering timing, when the duration of the low level signal received by the reset timing unit 610 is greater than or equal to a fourth preset time period, the output signal of the reset timing unit 610 changes from a high level to a low level, the low level signal at this time is a reset off signal, the control unit 160 receives the reset off signal and then controls the first switch unit 180 to be turned off so that the battery 300 stops supplying power to the system circuit 200, when the reset timing unit 610 times the first switch unit 180 and turns off the first preset time period, the control unit 160 generates a reset on signal, and then controls the first switch unit 180 to be turned on after receiving the reset on signal, where the reset 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, and the like, so that the design can prevent false triggering. In addition, in other embodiments of the present application, the output end of the reset timing unit 610 outputs a low level signal under a normal condition, where the high level signal is a reset off signal and the low level signal is a reset on signal. In the present embodiment, the reset timer 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 the present embodiment, with continued reference to fig. 2, the battery protection circuit 100 further includes a system ground VM, the system ground VM is used for electrically connecting to the system circuit 200, and the system ground VM is also used for charging. In the present embodiment, the first switching unit 180 is disposed between the system ground and the power ground GND.

In this embodiment, the battery protection circuit 100 is located on the same Chip, that is, the battery protection circuit 100 is integrally made as a System On Chip (SOC), which is a technology commonly used in the field of integrated circuits, and aims to combine a plurality of integrated circuits with specific functions on one Chip to form a System or product, including a finished hardware System and embedded software carried by the System or product. The system on chip has obvious advantages in aspects of performance, cost, power consumption, reliability, life cycle, application range and the like. In addition, in other embodiments of the present application, please refer to fig. 3, the units of the battery protection circuit 100 except the first switch unit 180 are all fabricated on the same chip, that is, the units of the battery protection circuit 100 except the first switch unit 180 are integrally fabricated as a system on chip. In addition, in other embodiments of the present application, the first resistor R1 and the capacitor C in fig. 2 may also be implemented in a system on chip.

It should be understood that reference to "a plurality" herein means two or more. Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.

It should be noted that, in the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. For the apparatus embodiment, since it is substantially similar to the method embodiment, the description is relatively simple, and reference may be made to the partial description of the method embodiment for relevant points.

The above disclosure is only for the purpose of illustrating the preferred embodiments of the present application and is not to be construed as limiting the scope of the present application, so that the present application is not limited thereto, and all equivalent variations and modifications can be made to the present application.

Claims

1. A battery protection circuit, comprising: the battery protection circuit comprises a power supply end, a power grounding end, a voltage protection unit, a current protection unit, a control unit and a first switch unit, wherein the power supply end and the power grounding end are respectively used for being electrically connected with a battery, and the first switch unit is used for controlling the battery to supply power to a system circuit;

the system circuit comprises a third switching unit, the input end of the third switching unit is connected with the first level signal, the output end of the third switching unit is electrically connected with one end of the second resistor, the other end of the second resistor is electrically connected with the power supply end, and the control end of the third switching unit is controlled by hardware or software of the system circuit;

the battery protection circuit is used for being connected with a battery and a system circuit to assemble an electronic device, when the electronic device is started to reset, a signal on a reset output end of the system circuit is controlled to change, a voltage signal received by a power supply end changes due to the change of the signal transmitted by the reset output end, the battery protection circuit further comprises a reset timing unit, the reset timing unit is electrically connected with the power supply end and a control unit respectively, when the reset timing unit learns that the voltage signal received by the power supply end changes for a duration time which is greater than or equal to a preset time period, the control unit controls a first switch unit to be switched off so that the battery stops supplying power to the system circuit, the system circuit is completely powered off, and after the first switch unit is switched off for the first preset time period, the control unit controls the first switch unit to be switched on so that the battery recovers to supply power to the system circuit, and the system circuit reloads data and programs.

2. The battery protection circuit according to claim 1, 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 electrically connected to the power supply terminal respectively, the initial verification unit is further electrically connected to the reset unit, the reset unit is electrically connected to the reset timing unit, an 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 time period, the initial 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 a number of pulses received in a second predetermined time period is greater than or equal to a first predetermined number, the initial verification unit triggers generation of a reset off signal to control the first switch unit to be turned off by the control unit, and when the reset timing unit times that the first switch unit is turned off for the first predetermined time period, the reset on signal is generated to control the first switch unit to be turned on by the first switch unit.

3. The battery protection circuit of claim 2, further comprising a comparator, wherein a first input terminal of the comparator is electrically connected to the power supply terminal, a second input terminal of the comparator is connected to a reference voltage, and an output terminal of the comparator is electrically connected to the initial verification unit and the reset unit, respectively.

4. The battery protection circuit of claim 1, wherein the control unit controls the first switching unit to turn off to stop the battery from supplying power to the system circuit when the number of pulses received by the power supply terminal in the third preset time period is greater than or equal to a second predetermined number, and controls the first switching unit to turn on to resume the battery from supplying power to the system circuit after the first switching unit turns off for the first preset time period.

5. The battery protection circuit according to claim 4, further comprising a pulse counting unit electrically connected to the power supply terminal, and a reset timing unit electrically connected to an output terminal of the pulse counting unit and an output terminal of the reset timing unit, wherein the output terminal of the reset timing unit is electrically connected to the control unit, and when the pulse counting unit receives a pulse number greater than or equal to a second predetermined number within a third predetermined time period, the pulse counting unit triggers generation of a reset off signal to control the first switch unit to be turned off by the control unit, and when the reset timing unit times the first switch unit to be turned off for a first predetermined time period, the pulse counting unit generates a reset on signal to control the first switch unit to be turned on by the control unit.

6. The battery protection circuit of claim 1, wherein the control unit controls the first switch unit to be turned off when the duration of the high level signal or the low level signal received by the power supply terminal within the predetermined time period is greater than or equal to a fourth preset time period, so that the battery stops 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 turned off for the first preset time period.

7. The battery protection circuit of claim 6, further comprising a reset timing unit electrically connected to the power supply terminal, wherein an output terminal of the reset timing unit is electrically connected to the control unit, and when the reset timing unit receives a high level signal or a low level signal for a duration greater than or equal to a fourth preset time period due to a change of a signal at the reset output terminal, the reset timing unit triggers generation of a reset off signal to control the first switch unit to be turned off, and when the reset timing unit times the first switch unit to be turned off for the first preset time period, the reset on signal is generated to control the first switch unit to be turned on.

8. The battery protection circuit according to any one of claims 1-7, wherein the power supply terminal receives a signal from the reset output terminal as a coded signal pre-agreed with the system circuit.

9. The battery protection circuit of any of claims 1-7, wherein the first switching unit comprises a MOS transistor.

10. The battery protection circuit according to any one of claims 1 to 7, wherein the battery protection circuit is located on the same chip, or wherein units of the battery protection circuit other than the first switching unit are located on the same chip.

11. A battery assembly, comprising:

a battery;

the battery protection circuit according to any one of claims 1 to 10, wherein a power supply terminal and a power supply ground terminal of the battery protection circuit are electrically connected to the battery, respectively, the first switch unit of the battery protection circuit is configured to control the battery to supply power to the system circuit, and the power supply terminal of the battery protection circuit is further configured to be electrically connected to a reset output terminal of the system circuit.

12. An electronic device, comprising:

the battery assembly of claim 11;