CN112117800A - Battery protection circuit, battery pack and electronic device - Google Patents
Battery protection circuit, battery pack and electronic device Download PDFInfo
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- CN112117800A CN112117800A CN202010969763.2A CN202010969763A CN112117800A CN 112117800 A CN112117800 A CN 112117800A CN 202010969763 A CN202010969763 A CN 202010969763A CN 112117800 A CN112117800 A CN 112117800A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00302—Overcharge protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00304—Overcurrent protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00306—Overdischarge protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0036—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using connection detecting circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0069—Charging or discharging for charge maintenance, battery initiation or rejuvenation
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/0071—Regulation of charging or discharging current or voltage with a programmable schedule
Abstract
The application provides a battery protection circuit, includes: the charging and discharging protection device comprises a power supply end, a power grounding end, an overcharge voltage protection unit, an overdischarge voltage protection unit, a discharging and overcurrent protection unit, a charging and overcurrent 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 battery protection circuit further comprises a reset input end, the reset input end is used for being electrically connected with 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 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 embodiment of 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
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 requires a separate reset IC chip 940 and a second switching unit 950 to be mounted, and the reset IC chip 940 itself has a high cost, resulting in a high cost of the electronic device itself.
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 charging and discharging protection device comprises a power supply end, a power grounding end, an overcharge voltage protection unit, an overdischarge voltage protection unit, a discharging and overcurrent protection unit, a charging and overcurrent 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 battery protection circuit further comprises a reset input end, the reset input end is used for being electrically connected with 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 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.
Optionally, when the reset input terminal receives the first signal, the battery protection circuit is triggered to generate a reset control signal and send the reset control signal to the control unit, and after receiving the reset control signal, 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 a first preset time period, the control unit controls the first switch unit to be turned on so that the battery resumes supplying power to the system circuit.
Optionally, the reset control signal includes a reset off signal and a reset on signal, the first signal includes a first-stage signal and a second-stage signal, the first-stage signal includes a continuous high-level signal or a continuous low-level signal, and 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 electrically connected with the reset input end, the initial verification unit is also electrically connected with the reset unit, the reset unit is electrically connected with the reset timing unit, the output end of the reset timing unit is electrically connected with the control unit, when the initial verification unit receives a continuous high level or continuous low level signal with a preset time length, the verification unit sends a signal to the reset unit to enable the reset unit to detect a 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 preset number, the reset unit triggers the generation of a reset turn-off signal to control the first switch unit to be turned off, when the reset timing unit times that the first switch unit is disconnected for a first preset time period, a reset starting signal is generated to control the first switch unit to be started.
Optionally, the battery protection circuit further includes a comparator, a first input terminal of the comparator is electrically connected to the reset input terminal, the first input terminal is further electrically connected to the system ground terminal via a first resistor, 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.
Optionally, the first signal includes a pulse signal, the reset control signal includes a reset off signal and a reset on signal, the battery protection circuit further includes a pulse counting unit and a reset timing unit, the pulse counting unit is electrically connected to the reset input terminal, an output terminal of the reset counting unit is electrically connected to the reset timing unit, an output terminal of the reset timing unit is electrically connected to the control unit, the reset off signal is triggered to be generated to control the first switch unit to be turned off when the pulse counting unit receives a pulse number greater than or equal to a second predetermined number in a third preset time period, and the reset on signal is generated to control the first switch unit to be turned on when the reset timing unit times the first switch unit to be turned off in the first preset time period.
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, the battery protection circuit further includes a reset timing unit, the reset timing unit is electrically connected to the reset input end, the reset turn-off signal is triggered and generated to control the first switch unit to be turned off 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, and the reset turn-on signal is generated to control the first switch unit to be turned on when the reset timing unit times that the first switch unit is turned off for the first preset time period.
Optionally, the first signal is a coded signal of a battery protection circuit and a system circuit pre-agreed.
Optionally, the first switching unit includes a MOS transistor.
Optionally, the battery protection circuit is fabricated on the same chip, or all units of the battery protection circuit except the first switch unit are fabricated 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 reset input end of the battery protection circuit is used for being electrically connected with 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 electrically connected with the reset input end of the battery protection circuit.
The embodiment of the application has the following beneficial effects: the battery protection circuit further comprises a reset input end, the reset input end is used for being electrically connected with 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 switched off for a first preset time period, the control unit controls the first switch 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, only one reset input end needs to be added or shared with other terminals, 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 embodiment of the present application with a reset input electrically connected to a control unit;
FIG. 5 is a waveform diagram of signals received at the reset input terminal and a reset control signal in FIG. 4;
FIG. 6 is a schematic diagram of an electrical connection between a reset input terminal and a control unit according to another embodiment of the present application;
FIG. 7 is a schematic diagram of an electrical connection between a reset input terminal and a control unit according to yet another embodiment of the present application;
FIG. 8 is a waveform diagram of signals received at the reset input terminal and a reset control signal in FIG. 7;
FIG. 9 is a schematic diagram of the reset input terminal electrically connected to the control unit according to yet another embodiment of the present application;
FIG. 10 is a waveform diagram of signals received at the reset input terminal and a reset control signal in FIG. 9;
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; RST-reset input; 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; 410-an initial verification unit; 420-a reset unit; 430. 520, 610-reset timing unit; 440-a comparator; 510-a pulse counting unit; r1 — first resistance; r2 — second resistance; r3 — third resistance; r4-fourth 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 this 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 the listed 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 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 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 embodiment, the number of the battery 300 is one or more, when there are a plurality of batteries 300, the plurality of batteries 300 may be connected in parallel or in series or in parallel, the battery 300 is preferably a lithium battery 300, the capacity of the battery 300 is 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, preferably, the capacity of the battery 300 is 20mAH to 40mAH, and the battery 300 has a smaller size and can be conveniently configured in a small electronic device, for example, a wireless bluetooth headset. In addition, in other embodiments of the present application, referring to fig. 3, 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, 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, an overcharge voltage protection unit 110, an overdischarge voltage protection unit 190, a discharge overcurrent protection unit 130, a charge overcurrent protection unit 120, 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 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 causing 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 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, such as 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, 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, the battery protection circuit 100 further includes a reset input RST, which is a newly added terminal of the battery protection circuit 100 and 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 so that the battery 300 stops 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 so that the battery 300 is recovered to supply power to the system circuit 200. In this embodiment, the generation of the first signal may be implemented by software, or may be implemented by hardware, and when the generation is implemented by hardware, the generation may be implemented by, for example, a power key or a sound key of the electronic device, for example, by pressing the power key, and the sound key at the same time. In addition, in other embodiments of the present application, the reset input RST may not be a terminal newly added to the battery protection circuit 100, but may be shared with other terminals of the battery protection circuit 100, so that the same terminal may implement a plurality of different functions by inputting different signals.
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 the first signal to the reset input RST, after the reset input RST receives the first signal, the control unit 160 controls the first switch unit 180 to be turned off, so that the battery 300 stops 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, so as to recover the battery 300 to supply power to the system circuit 200, at this time, the system circuit 200 is supplied with power again, the system circuit 200 reloads the data and the program, and the electronic device realizes normal reset restart. The reset restart function is realized by using the existing first switch unit 180 in the embodiment, only one reset input terminal RST needs to be added or shared with other terminals, and the reset IC chip and the second switch unit matched with the reset IC chip do not need to be separately added, so that the cost is greatly reduced, and the competitiveness of the electronic device is increased.
In this embodiment, when the reset input RST receives the first signal, the battery protection circuit 100 is triggered to generate a reset control signal and transmit the reset control signal to the control unit 160, and the control unit 160 controls the first switching unit 180 to turn off after receiving the reset control signal, so that the battery 300 stops supplying power to the system circuit 200, and controls the first switching unit 180 to turn on after the first switching unit 180 turns off for a first time period to resume the supply of power from the battery 300 to the system circuit 200. However, the present application is not limited thereto, and in other embodiments of the present application, when the reset input 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 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 resume the battery 300 from supplying power to the system circuit 200, so that the reset control signal does not need to be generated in the middle.
In this embodiment, the first signal is a digital code signal, which is pre-agreed when the battery protection circuit 100 and the system circuit 200 are designed, and when the reset input terminal RST receives the code signal, the battery protection circuit 100 can recognize the first signal. For example, the first signal includes two periods of time: the first time period is a high level signal, the second time period is a pulse signal of a predetermined number, where the high 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 count 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 battery protection circuit 100 generates a reset control signal, and when the number of pulses does not meet the preset requirement, the element corresponding to the battery protection circuit 100 returns to a state where activation is not started. Since the first signal is a coded signal of the protocol of the battery protection circuit 100 and the system circuit 200, the specific form of the first signal is not limited, and a complex coded signal or a simple coded signal may be used, so that the battery protection circuit 100 and the system circuit 200 can recognize the coded signal which is well agreed in advance by the battery protection circuit 100 and the system circuit 200. In addition, when the first signal is relatively complex, the battery protection circuit 100 is reliable and safe, and can prevent false triggering.
In the present embodiment, there are three ways to trigger the battery protection circuit 100 to generate the reset control signal when the reset input terminal RST receives the first signal, which are described below. Of course, the manner of triggering the battery protection circuit 100 to generate the reset control signal when the reset input terminal RST receives the first signal is not limited to the following three, and in other embodiments of the present application, a person skilled in the art may also set other conventional circuits to trigger the battery protection circuit 100 to generate the reset control signal.
1. In an embodiment of the present application, referring to fig. 2, 4 and 5, the reset control signal includes a reset off signal and a reset 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 low-level signal, and the first-stage signal is used for starting verification, that is, the battery protection circuit 100 is used for verifying whether the received signal is the first signal, where the first-stage signal is a high-level signal having a predetermined duration, for example, a high-level signal of 16ms, and the second-stage signal is a formal reset signal, which is used to distinguish it from other signals, where the second-stage signal includes a pulse signal, the reset signal is used to tell the battery protection circuit 100 to generate a reset shutdown signal, e.g., the second phase signal comprises 5 pulses.
Referring to fig. 4, in the present 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 verifying unit 410 and the reset unit 420 are respectively electrically connected to the reset input RST directly or indirectly, the start verifying unit 410 is further electrically connected to the reset unit 420, the reset unit 420 is electrically connected to the reset timing unit 430, an output end of the reset timing unit 430 is electrically connected to the control unit 160, and the reset unit 420 is a pulse counting unit. When the initial verification unit 410 receives a continuous high level signal with 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 reset 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 reset unit triggers generation of a reset off signal to control the first switch unit 180 to be turned off, and when the reset timing unit 430 times the first switch unit 180 to be turned off for the first preset time period, the reset on signal is generated to control the first switch unit 180 to be turned on. In this embodiment, please refer to fig. 4 and fig. 5 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 predetermined time period and the second predetermined time period 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 of the reset input terminal RST, that is, the detection signal is used to trigger the reset unit 420 to detect the signal of the reset input terminal RST. 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 another embodiment of the present application, please refer 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 further connected to the system ground VM through a second resistor R2, 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 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 setting of the comparator 440, the signal of the reset input terminal RST can be shaped, and the signal lower than the reference voltage is filtered out, so as to further prevent false triggering; meanwhile, the voltage of the reset input end RST is relative to the system ground end VM, and the reference voltage is relative to the power supply ground end GND, so that the voltage signal of the reset input end RST can be uniformly converted into the voltage signal of the relative power supply ground end GND, and the problem caused by the fact that the voltage signal of the reset input end RST changes back and forth is avoided.
2. In an embodiment of the present application, in order to reduce the cost, please refer to fig. 2, 7 and 8, the reset control signal includes a reset off signal and a reset 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 RST is default to be low level, in this embodiment, the reset input RST is grounded via the third resistor R3 to realize low level, the pulse counting unit 510 outputs a high level signal under normal conditions, the reset input RST is electrically connected to the pulse counting unit 510, the output end 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 end of the reset counting unit is electrically connected to the control unit 160. When the reset input terminal RST receives the first signal, the pulse counting unit 510 counts the pulses, the pulse counting unit 510 triggers counting at an ascending edge, when the number of pulses received by the pulse counting unit 510 in a third preset time period is greater than or equal to a second preset number, the output signal of the pulse counting unit 510 is converted from a high level to a low level, the low level is a reset off signal, when the reset timing unit 520 times the first switch unit 180 to be turned off for a first preset time period, a reset on signal is generated to control the first switch unit 180 to be turned on, and the reset on signal is a high level signal. The first preset time period, the third preset time period and the first 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 first 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 terminal of the pulse counting unit 510 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 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, referring to fig. 2, 9 and 10, the reset control signal includes a reset off signal and a reset 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 RST is default to be low level, in this embodiment, the reset input RST is grounded to achieve low level through the fourth resistor R4, the reset timing unit 610 outputs a high level signal under normal conditions, the reset input RST is electrically connected to the reset timing unit 610, and the output end of the reset timing unit 610 is electrically connected to the control unit 160. When the reset input terminal RST receives the first signal, i.e., when the signal received by the reset input terminal RST is changed from a low level to a high level, the reset timing unit 610 triggers timing, the reset timing unit 610 performs timing by rising edge triggering, when the duration of the high 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 is changed from a high level to a low level, the low level signal at this time is a reset off signal, when the reset timing unit 610 times that the first switch unit 180 is turned off for 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 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 fabricated on the same Chip, that is, the battery protection circuit 100 is integrally fabricated 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. 3 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 device embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, refer to the partial description of the method embodiment.
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 (11)
1. A battery protection circuit, comprising: the charging and discharging protection device comprises a power supply end, a power grounding end, an overcharge voltage protection unit, an overdischarge voltage protection unit, a discharging and overcurrent protection unit, a charging and overcurrent 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 battery protection circuit further comprises a reset input end, the reset input end is used for being electrically connected with 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 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.
2. The battery protection circuit of claim 1, wherein the battery protection circuit is triggered to generate a reset control signal when the reset input terminal receives the first signal and send the reset control signal to the control unit, and the control unit controls the first switch unit to be turned off after receiving the reset control signal so that the battery stops supplying power to the system circuit and controls the first switch unit to be turned on after the first switch unit is turned off for a first preset time period so as to resume supplying power to the system circuit by the battery.
3. The battery protection circuit of claim 2, wherein the reset control signal comprises a reset off signal and a reset on signal, the first signal comprises a first phase signal and a second phase signal, wherein the first phase signal comprises a continuous high level signal or a continuous low level signal, and the second phase signal comprises 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 electrically connected with the reset input end, the initial verification unit is also electrically connected with the reset unit, the reset unit is electrically connected with the reset timing unit, the output end of the reset timing unit is electrically connected with the control unit, when the initial verification unit receives a continuous high level or continuous low level signal with a preset time length, the verification unit sends a signal to the reset unit to enable the reset unit to detect a 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 preset number, the reset unit triggers the generation of a reset turn-off signal to control the first switch unit to be turned off, when the reset timing unit times that the first switch unit is disconnected for a first preset time period, a reset starting signal is generated to control the first switch unit to be started.
4. The battery protection circuit of claim 3, further comprising a comparator, wherein a first input terminal of the comparator is electrically connected to the reset input terminal, the first input terminal is further electrically connected to a system ground terminal via a first resistor, a second input terminal of the comparator is connected to a reference voltage, and output terminals of the comparator are electrically connected to the initial verification unit and the reset unit, respectively.
5. The battery protection circuit according to claim 2, wherein the first signal comprises a pulse signal, the reset control signal comprises a reset off signal and a reset 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 counting unit is electrically connected to the reset timing unit, the output terminal of the reset timing unit is electrically connected to the control unit, the reset off signal is triggered to be generated to control the first switch unit to be turned off when the pulse counting unit receives a pulse number greater than or equal to a second predetermined number in a third preset time period, and the reset on signal is generated to control the first switch unit to be turned on after the first switch unit is turned off in the reset timing unit.
6. The battery protection circuit of 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 off signal and a reset on signal, the battery protection circuit further comprises a reset timing unit, the reset timing unit is electrically connected to the reset input terminal, the reset off signal is triggered to be generated to control the first switch unit to be turned off when the high level signal or the low level signal received by the reset timing unit lasts for a period greater than or equal to a fourth preset time period, and the reset on signal is generated to control the first switch unit to be turned on after the first switch unit is turned off by the reset timing unit for the first preset time period.
7. The battery protection circuit of any of claims 1-6, wherein the first signal is a coded signal that is pre-agreed with system circuitry by the battery protection circuit.
8. The battery protection circuit of any of claims 1-6, wherein the first switching unit comprises a MOS transistor.
9. The battery protection circuit according to any one of claims 1 to 6, wherein the battery protection circuit is fabricated on the same chip, or the battery protection circuit except for the first switching unit is fabricated on the same chip.
10. A battery assembly, comprising:
a battery;
the battery protection circuit according to any one of claims 1 to 9, 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 reset input terminal of the battery protection circuit is configured to be electrically connected to the system circuit.
11. An electronic device, comprising:
the battery assembly of claim 10;
the system circuit is electrically connected with the reset input end of the battery protection circuit.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010969763.2A CN112117800A (en) | 2020-09-15 | 2020-09-15 | Battery protection circuit, battery pack and electronic device |
| PCT/CN2021/115170 WO2022057596A1 (en) | 2020-09-15 | 2021-08-27 | Battery protection circuit, battery assembly and electronic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010969763.2A CN112117800A (en) | 2020-09-15 | 2020-09-15 | Battery protection circuit, battery pack and electronic device |
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| Publication Number | Publication Date |
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| CN112117800A true CN112117800A (en) | 2020-12-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010969763.2A Pending CN112117800A (en) | 2020-09-15 | 2020-09-15 | Battery protection circuit, battery pack and electronic device |
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| WO2023134449A1 (en) * | 2022-01-14 | 2023-07-20 | 西安稳先半导体科技有限责任公司 | Wireless earbud assembly, battery protection circuit, battery assembly, electronic apparatus and electronic assembly |
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Application publication date: 20201222 |