CN114243870B - Over-discharge protection circuit, battery protection board and electronic equipment - Google Patents
Over-discharge protection circuit, battery protection board and electronic equipment Download PDFInfo
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- CN114243870B CN114243870B CN202210165217.2A CN202210165217A CN114243870B CN 114243870 B CN114243870 B CN 114243870B CN 202210165217 A CN202210165217 A CN 202210165217A CN 114243870 B CN114243870 B CN 114243870B
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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
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
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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
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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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
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Protection Of Static Devices (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The application provides an over-discharge protection circuit, battery protection board and electronic equipment, and the circuit includes: the first end is used for being connected with the positive electrode lug of the battery, and the second end is used for being connected with the negative electrode lug of the battery; the third end and the fourth end are used for connecting an electricity utilization circuit; the fifth end and the sixth end are respectively used for correspondingly connecting the first end and the second end of the battery electric quantity acquisition circuit; the first end of the over-discharge protection circuit is connected with the third end and the fifth end of the over-discharge protection circuit; the second end of the over-discharge protection circuit is connected with the first end of the first switch, and the second end of the first switch is respectively connected with the fourth end and the sixth end of the over-discharge protection circuit; the first control module is connected with a first control end of the first switch and is used for: after the electronic equipment is shut down, when the voltage of the battery is lower than a preset first voltage threshold value, the first switch is controlled to be turned off, and when the voltage of the battery is not lower than the preset first voltage threshold value, the first switch is controlled to be turned on. The battery leakage problem after the electronic equipment is shut down can be relieved.
Description
Technical Field
The application relates to the technical field of charge and discharge, in particular to an over-discharge protection circuit, a battery protection board and electronic equipment.
Background
After an electronic device (e.g., a cell phone) is powered down, the power circuit in the electronic device remains as an impedance, resulting in battery leakage. If the leakage time is long enough, the battery is overdischarged, which in turn is liable to cause damage to the battery.
Disclosure of Invention
The application provides an overdischarge protection circuit and electronic equipment, which can relieve the problem of battery leakage after the electronic equipment is shut down and reduce the battery power consumption after the electronic equipment is shut down.
In a first aspect, an embodiment of the present application provides an over-discharge protection circuit, which is applied to an electronic device, where the electronic device includes a battery and an electric circuit, and the electric circuit includes: the battery electric quantity acquisition circuit, battery electric quantity acquisition circuit's first end and second end are used for carrying out the electric quantity sampling of battery, and the second end is through steady voltage ground connection, and the protection circuit that excessively puts includes:
the first end of the over-discharge protection circuit is used for being connected with the positive electrode lug of the battery, and the second end of the over-discharge protection circuit is used for being connected with the negative electrode lug of the battery; the third end and the fourth end of the over-discharge protection circuit are used for being connected with the power utilization circuit to supply power to the power utilization circuit; the fifth end and the sixth end of the over-discharge protection circuit are respectively used for correspondingly connecting the first end and the second end of the battery electric quantity acquisition circuit;
the first end of the over-discharge protection circuit is connected with the third end of the over-discharge protection circuit and is also connected with the fifth end of the over-discharge protection circuit;
the second end of the over-discharge protection circuit is connected with the first end of the first switch, and the second end of the first switch is respectively connected with the fourth end and the sixth end of the over-discharge protection circuit;
the first control module is connected with a first control end of the first switch and is used for: after the electronic equipment is shut down, when the voltage of the battery is lower than a preset first voltage threshold value, the first switch is controlled to be turned off, and when the voltage of the battery is not lower than the preset first voltage threshold value, the first switch is controlled to be turned on.
In the circuit, after the electronic equipment is shut down, when the voltage of the battery is lower than a preset first voltage threshold value, the first control module controls the first switch to be turned off, a passage between the battery and the power utilization circuit is disconnected, the battery stops supplying power to the power utilization circuit, and over-discharge protection of the battery is realized, so that the battery leakage problem after the electronic equipment is shut down is relieved, and the battery electricity consumption after the electronic equipment is shut down is reduced.
In one possible implementation, the over-discharge protection circuit further includes: a second switch and a second control module, wherein,
the second control module is connected with the first control end of the second switch, and is used for: after the electronic equipment is shut down, when the voltage of the battery is lower than a preset first voltage threshold value, the second switch is controlled to be turned off, and when the voltage of the battery is not lower than the preset first voltage threshold value, the second switch is controlled to be turned on;
the second end of the first switch is connected with the fourth end of the over-discharge protection circuit, and the over-discharge protection circuit comprises: the second end of the first switch is connected with the first end of the second switch, and the second end of the second switch is connected with the fourth end of the over-discharge protection circuit.
In one possible implementation, the over-discharge protection circuit further includes: a third switch and a third control module, wherein,
the third control module is connected with the first control end of the third switch and is used for: after the electronic equipment is shut down, when the voltage of the battery is lower than a preset first voltage threshold value, the third switch is controlled to be turned off, and when the voltage of the battery is not lower than the preset first voltage threshold value, the third switch is controlled to be turned on;
the second end of the first switch is respectively connected with the fourth end and the sixth end of the over-discharge protection circuit, and the second switch comprises: the second end of the first switch is connected with the first end of the third switch, and the second end of the third switch is respectively connected with the fourth end and the sixth end of the over-discharge protection circuit.
In one possible implementation, the second terminal of the first switch is connected to the sixth terminal of the over-discharge protection circuit, including:
the second end of the first switch is connected with the sixth end of the over-discharge protection circuit through a resistor.
In one possible implementation, the first end of the over-discharge protection circuit is connected to the fifth end of the over-discharge protection circuit, including:
the first end of the over-discharge protection circuit is connected with the fifth end of the over-discharge protection circuit through a resistor.
In one possible implementation, the first control module includes:
the first end of the first control module is connected with the first end of the over-discharge protection circuit, and the second end of the first control module is connected with the control end of the first switch;
the first control module is used for: when the voltage of the first end is lower than a preset first voltage threshold value, outputting a first voltage signal to a control end of the first switch through the second end, wherein the first voltage signal is used for controlling the first switch to be turned off; when the voltage of the first end is not lower than a preset first voltage threshold value, a second voltage signal is output to the control end of the first switch through the second end, and the second voltage signal is used for controlling the first switch to be conducted.
In one possible implementation, the first switch includes: and the control end of the switching tube is used as the control end of the first switch.
In one possible implementation, a first end of the first control module is connected to a first end of the over-discharge protection circuit, including:
the first end of the first control module is connected with the first end of the over-discharge protection circuit through a resistor.
In one possible implementation, the first voltage threshold is 2.4V.
In a second aspect, an embodiment of the present application provides a battery protection board, which is applied to an electronic device, where the electronic device includes a battery and an electric circuit, and the electric circuit includes: and the battery protection board comprises an over-discharge protection circuit of any one of the first aspect.
In a third aspect, an embodiment of the present application provides an electronic device, including: battery and power consumption circuit, power consumption circuit includes: the first end and the second end of the battery electric quantity acquisition circuit are used for sampling the electric quantity of the battery, and the second end is grounded through a voltage stabilizing tube; the electronic device further includes: the over-discharge protection circuit of any one of the first aspects.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an electronic device according to an embodiment of the present application;
fig. 2 is a schematic diagram of a battery leakage in an electronic device according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of an over-discharge protection circuit according to an embodiment of the present application;
fig. 4 is a schematic diagram of an over-discharge protection principle of the over-discharge protection circuit shown in fig. 3 according to an embodiment of the present application;
fig. 5 is another schematic structural diagram of the over-discharge protection circuit according to the embodiment of the present application;
fig. 6A is a schematic structural diagram of an over-discharge protection circuit according to an embodiment of the present disclosure;
fig. 6B is a schematic diagram of a fourth configuration of an over-discharge protection circuit according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of another electronic device according to an embodiment of the present application;
fig. 8 is a schematic diagram of another principle of battery leakage in the electronic device according to the embodiment of the present application;
fig. 9 is a schematic diagram of a fifth configuration of an over-discharge protection circuit according to an embodiment of the present application;
fig. 10 is a schematic diagram of the working principle of the over-discharge protection circuit shown in fig. 9;
fig. 11 is a schematic diagram of a sixth structure of an over-discharge protection circuit according to an embodiment of the present application;
fig. 12 is a schematic diagram of a seventh configuration of an over-discharge protection circuit according to an embodiment of the present application.
Detailed Description
The terminology used in the description section of the present application is for the purpose of describing particular embodiments of the present application only and is not intended to be limiting of the present application.
In order to protect a battery, a battery protection plate is generally provided for the battery in an electronic device (for example, a mobile phone). As shown in fig. 1, taking a battery including a positive tab b+ and a negative tab B-as an example, an n+ pin and an N-pin of the battery protection plate are respectively connected with the positive tab b+ and the negative tab B-of the battery correspondingly; the P+ pin and the P-pin of the battery protection plate are respectively used as the positive electrode and the negative electrode of the battery protection plate and are connected with the power utilization circuit of the electronic equipment, so that the battery can provide electric energy for the power utilization circuit through the P+ pin and the P-pin of the battery protection plate.
After the electronic device is turned off, the power utilization circuit in the electronic device still exists as impedance, which can be equivalent to the grounding resistor R shown in fig. 2, so that a power utilization path shown in fig. 2 is formed between the positive tab and the negative tab of the battery, and the battery is leaked. If the leakage time is long enough, the battery is overdischarged, which in turn is liable to cause damage to the battery.
In order to solve the problem of overdischarge of the battery caused by electric leakage after the electronic device is turned off, in one embodiment, an overdischarge protection circuit for the battery may be provided in the battery protection board.
As shown in fig. 3, the over-discharge protection circuit includes: a switch K1 is arranged between an N-pin of the battery protection plate and a P-pin of the battery protection plate, and a control module 1 is arranged in the battery protection plate for the switch K1; the control module 1 is used for: after the electronic device is turned off, when the voltage of the battery is not less than a preset overdischarge voltage threshold (for example, 2.4V), the control switch K1 is turned on, and when the voltage of the battery is less than the preset overdischarge voltage threshold (for example, 2.4V), the control switch K1 is turned off. Therefore, as shown in fig. 4, when the electronic device is turned off, after the voltage of the battery is reduced to the overdischarge voltage threshold, the switch K1 is turned off, so as to disconnect the path between the battery and the power circuit, thereby achieving the purpose of preventing the battery from continuously supplying power to the power circuit through the path, that is, achieving the purpose of preventing the battery from continuously leaking, and realizing the overdischarge protection of the battery.
Optionally, the control module 1 may be connected to an n+ pin of the battery protection board, to sample a voltage of the n+ pin of the battery protection board, and since the n+ pin is connected to the positive electrode tab of the battery, the control module 1 samples the voltage of the n+ pin, that is, samples the battery voltage, so that the obtained sampled voltage is the battery voltage, and the control module 1 may perform the above-mentioned control of the switch K1 according to the sampled voltage after the electronic device is turned off.
Optionally, the control module 1 may be implemented by matching a chip with an electronic component, and the switch K1 may be implemented by a switching tube such as a MOS tube or a combination of switching tubes. For example, in the over-discharge protection circuit shown in fig. 5:
the control module 1 may include: control chip 51, resistance R1~ R4, electric capacity C1~ C3, control chip 51 includes following pin: VDD pin, VSS pin, CS pin, V-pin, DO pin and CO pin, wherein VDD pin is power supply voltage pin, VSS pin is ground pin, CS pin is current sampling pin, V-pin is overcurrent/short protection voltage detection pin, DO pin and CO pin are digital signal output pins.
The switch K1 may include: the S1 pin, the S2 pin, the G1 pin and the G2 pin, wherein the G1 pin and the G2 pin are control pins for turning on or off a circuit between the S1 pin and the S2 pin in the switch 52.
Optionally, the switch K1 may be implemented by 2 NMOS tubes connected in reverse series, where the G1 pin and the G2 pin are gates of the 2 NMOS tubes, and when the G1 pin and the G2 pin receive a high level signal, a circuit between the S1 pin and the S2 pin in the switch K1 is turned on, and when at least one of the G1 pin and the G2 pin receives a low level signal, a circuit between the S1 pin and the S2 pin in the switch K1 is turned off.
It should be noted that, in fig. 5, in order to cooperate with the control module 1 to implement functions such as overheat protection and short-circuit protection, the switch K1 includes 2 control pins as an example, and in other possible implementations, the switch K1 may include only 1 control pin, where the switch K1 may be implemented by a single switch tube, for example, an NMOS tube, which is not limited in the embodiments of the present application.
Referring to fig. 5, the connection relationship of the over-discharge protection circuit is as follows:
the S1 pin of the switch K1 is connected with the N-pin of the battery protection board through a resistor R4, the S2 pin is connected with the P-pin of the battery protection board, the G1 pin is connected with the DO pin of the control chip 51, and the G2 pin is connected with the CO pin of the control chip 51;
the VDD pin of the control chip 51 is connected with the N+ pin of the battery protection board through a resistor R1 and is grounded through a capacitor C1; the VSS pin is grounded; the CS pin is grounded through a capacitor C2, and is also connected with one ungrounded end of a resistor R4 through a resistor R2; the V-pin is connected with the S2 pin of the switch K1 through a resistor R3, and a capacitor C3 is connected between the S1 pin and the S2 pin in series.
The resistor R1 in the circuit plays a role in buffering, and the capacitors C1-C3 play a role in filtering.
The working principle of the over-discharge protection circuit shown in fig. 5 is described below, taking the circuit conduction between the S1 pin and the S2 pin when the switch K1 receives the high level signal at both the G1 pin and the G2 pin as an example:
when the battery works normally (i.e. various protection functions in the battery protection board are not triggered, for example, the battery supplies power normally, or charges and discharges, etc.), the DO pin and the CO pin of the control chip 51 can output high-level signals respectively, and the circuit between the S1 pin and the S2 pin in the switch K1 is controlled to be conducted, so that the battery can supply power normally for the power utilization circuit through the battery protection board;
the VDD pin is connected with the N+ pin of the battery protection board through a resistor R1, the N+ pin of the battery protection board is connected with the positive electrode lug B+ of the battery, so that the voltage received by the VDD pin can reflect the voltage of the positive electrode lug B+ of the battery, when the voltage received by the VDD pin is lower than a preset overdischarge voltage threshold (for example, 2.4V), the DO pin is converted from outputting a high-level signal to outputting a low-level signal to the G1 pin, so that a circuit between the S1 pin and the S2 pin in the switch K1 is disconnected, a passage between the battery and a power utilization circuit is disconnected, and the battery stops supplying power to the power utilization circuit, thereby realizing the overdischarge protection of the battery; when the voltage received by the VDD pin is not lower than the overdischarge voltage threshold (for example, 2.4V), the DO pin is converted from outputting a low-level signal to outputting a high-level signal to the G1 pin, so that a circuit between the S1 pin and the S2 pin in the switch K1 is conducted, the battery supplies power for the power utilization circuit, and the overdischarge protection of the battery is released.
It should be noted that, the above over-discharge protection circuit may also realize over-current/short-circuit protection, and overheat protection, specifically:
the V-pin is connected with the S2 pin of the switch K1 through the resistor R3, so that current detection can be carried out on a branch circuit formed by the resistor R4 and the switch K1 between the N-pin and the P-pin in the battery circuit board, when the detected current exceeds a preset current threshold value, the DO pin is converted into a low-level signal to the G1 pin, so that a circuit between the S1 pin and the S2 pin in the switch K1 is disconnected, the battery stops supplying power to a power circuit, and overcurrent/short circuit protection is realized; when the detected current does not exceed the preset current threshold, the DO pin is converted to output a high-level signal to the G1 pin, so that a circuit between the S1 pin and the S2 pin in the switch K1 is conducted, the battery supplies power for the power utilization circuit, and overcurrent/short-circuit protection is released.
The CS pin is connected with one end of the resistor R4 which is not grounded through the resistor R2, the resistor R4 can be a positive temperature coefficient thermistor, the voltage at two ends of the resistor R4 is sampled by the CS pin in a current detection mode, when the detected current exceeds a preset current threshold value, the DO pin is converted into an output low-level signal to the G1 pin, so that a circuit between the S1 pin and the S2 pin in the switch K1 is disconnected, and the battery stops supplying power to an electricity utilization circuit, thereby realizing overheat protection; when the detected current does not exceed the preset current threshold value, the DO pin is converted to output a high-level signal to the G1 pin, so that a circuit between the S1 pin and the S2 pin in the switch K1 is conducted, the battery supplies power for the power utilization circuit, and overheat protection is relieved.
In the above case, the pin for outputting the low level signal may be replaced with the CO pin, and protection such as leakage, overcurrent, short circuit, and overheat may be achieved.
Optionally, in order to ensure the reliability of the operation of the over-discharge protection circuit, as shown in fig. 6A, another set of over-discharge protection circuits formed by a control module 2 and a switch K2 may be added on the basis of the circuit shown in fig. 3, where the implementation of the control module 2 is the same as that of the control module 1, and the implementation of the switch K2 is the same as that of the switch K1, so as to ensure that when one set of over-discharge protection circuits fails, the other set of over-discharge protection circuits may implement over-discharge protection. Referring to fig. 5, a more specific circuit implementation structure of the over-discharge protection circuit shown in fig. 6A is shown in fig. 6B, and the connection relationship and the working principle between the control module 2, the switch K2, the fifth resistor R5 to the seventh resistor R7, and the fourth capacitor C4 to the sixth capacitor C6 in fig. 6B are not described herein, and may refer to the corresponding description in fig. 5. In the circuit structure shown in fig. 6B, the two sets of over-discharge protection circuit multiplexing resistors R4 perform over-heat protection.
Although the battery protection board provides the above-mentioned over-discharge protection circuit, the electronic device may still suffer from battery leakage, which may lead to battery damage due to over-discharge of the battery.
It was found through analysis that, as shown in fig. 7, the battery protection plate is further provided with an sns_p1 pin and an sns_n1 pin, the sns_p1 pin may be connected to the n+ pin of the battery protection plate through a resistor Ra, and the sns_n1 pin may be connected to the N-pin of the battery protection plate through a resistor Rb. The resistor Ra and the resistor Rb play a buffering role.
As shown in fig. 7, the sns_p1 pin and the sns_n1 pin provided on the battery protection board may be correspondingly connected to the first end A1 and the second end A2 of the battery power acquisition circuit outside the battery protection board, so as to support the battery power acquisition by the battery power acquisition circuit, and the power information acquired by the battery power acquisition circuit may be sent to the processor of the electronic device, where the processor may perform battery power prompt and charge/discharge control of the battery for the user according to the power information. In the battery electric quantity acquisition circuit, a grounded voltage stabilizing diode D is arranged at the second end A2 and used for stabilizing the voltage of the battery electric quantity acquisition circuit.
Based on the foregoing description, the power circuit of the electronic device may still be equivalent to the resistor R of the ground, and at this time, the equivalent circuit of the circuit shown in fig. 7 is shown in fig. 8, for example.
Referring to fig. 8, it can be seen that the electronic device has a path from the positive tab b+ of the battery, through the n+ pin and the p+ pin of the battery protection board, the equivalent resistance R of the power circuit, the zener diode D, the sns_n1 pin of the battery protection board, the resistance Rb to the N-pin of the battery protection board, and to the negative tab B "of the battery, and the path discharges the battery when the electronic device is turned off, and even if the switch K1 of the battery protection board is turned off, the path still exists and discharges the battery, so that the problem of battery damage caused by the over-discharge of the battery still occurs under the condition that the battery protection board has the over-discharge protection function as shown in the above embodiment.
Therefore, the embodiment of the application also provides another structural schematic diagram of the overdischarge protection circuit, which can solve the problem of overdischarge of the battery caused under the conditions shown in fig. 7 and 8, reduce the electric quantity consumption of the battery and the damage of the battery, and promote the user experience. As shown in fig. 9, the over-discharge protection circuit is different from the circuit shown in fig. 7 in that: one end of the resistor Rb is connected with the SNS_N1 pin of the battery protection plate, and the other end of the resistor Rb is connected with the second end of the switch K1 (the first end is the end of the switch K1 connected with the N-pin of the battery protection plate).
Because the control module 1 is configured to control the switch K1 to be turned on when the voltage of the battery is greater than a preset overdischarge voltage threshold (e.g., 2.4V), and control the switch K1 to be turned off when the voltage of the battery reaches the preset overdischarge voltage threshold (e.g., 2.4V), when the control switch K1 is turned off, the control module 1 can disconnect a path formed by a P-pin of the battery protection board between the battery and the power consumption circuit, and disconnect a path formed by an sns_n1 pin of the battery protection board between the battery and the power consumption circuit, so as to solve the battery leakage problem caused by the 2 paths, prevent the overdischarge problem of the battery, further reduce the power consumption of the battery and the battery damage, and improve the user experience.
In combination with the over-discharge protection circuit shown in fig. 6A, if two switches, i.e., a switch K1 and a switch K2, are disposed between the N-pin and the P-pin of the battery protection board, a schematic structural diagram of another embodiment of the over-discharge protection circuit provided in this application is shown in fig. 11, where a first end of the resistor Rb is connected to the sns_n1 pin of the battery protection board, and a second end is still connected to the second end of the first switch K1. The earth leakage protection principle can be referred to in the corresponding descriptions of fig. 9 and 10, and is not repeated here.
As shown in fig. 12, in the schematic structural diagram of another embodiment of the overdischarge protection circuit according to the present embodiment, a first end of a resistor Rb is connected to an sns_n1 pin of the battery protection board, and a second end is connected to a second end of a second switch K2 (the first end of the second switch K2 is the end connected to the first switch K1). Since the control logic of the first switch K1 and the control logic of the second switch K2 are the same, the implementation principle of the over-voltage protection circuit shown in fig. 12 may refer to the descriptions in fig. 9 to 11, and the description is omitted here.
The application also provides a battery protection board, which comprises the over-discharge protection circuit shown in any embodiment.
The application also provides electronic equipment, which comprises a battery, a battery protection board and an electric circuit, wherein the battery protection board comprises the over-discharge protection circuit shown in any embodiment.
The foregoing is merely specific embodiments of the present application, and any person skilled in the art may easily conceive of changes or substitutions within the technical scope of the present application, which should be covered by the protection scope of the present application. The protection scope of the present application shall be subject to the protection scope of the claims.
Claims (9)
1. An over-discharge protection circuit is applied to electronic equipment, the electronic equipment comprises a battery and an electric circuit, and the electric circuit comprises: the battery electric quantity acquisition circuit, battery electric quantity acquisition circuit's first end and second end are used for carrying out the electric quantity sampling of battery, the second end is through steady voltage ground connection, its characterized in that, electronic equipment still includes: the battery protection board is provided with the over-discharge protection circuit, the battery electric quantity acquisition circuit is arranged outside the battery protection board; the over-discharge protection circuit includes:
the first end of the over-discharge protection circuit is used for being connected with the positive electrode lug of the battery, and the second end of the over-discharge protection circuit is used for being connected with the negative electrode lug of the battery; the third end and the fourth end of the over-discharge protection circuit are used for being connected with the power utilization circuit to supply power for the power utilization circuit; the fifth end and the sixth end of the over-discharge protection circuit are respectively used for correspondingly connecting the first end and the second end of the battery electricity acquisition circuit;
the first end of the over-discharge protection circuit is connected with the third end of the over-discharge protection circuit and is also connected with the fifth end of the over-discharge protection circuit;
the second end of the over-discharge protection circuit is connected with the first end of the first switch, the second end of the first switch is respectively connected with the sixth end of the over-discharge protection circuit and the first end of the second switch, and the second end of the second switch is connected with the fourth end of the over-discharge protection circuit;
the first control module is connected with a first control end of the first switch, and the first control module is used for: after the electronic equipment is shut down, when the voltage of the battery is lower than a preset first voltage threshold value, the first switch is controlled to be turned off, and when the voltage of the battery is not lower than the preset first voltage threshold value, the first switch is controlled to be turned on;
the second control module is connected with the first control end of the second switch, and the second control module is used for: and after the electronic equipment is shut down, when the voltage of the battery is lower than a preset first voltage threshold value, the second switch is controlled to be turned off, and when the voltage of the battery is not lower than the preset first voltage threshold value, the second switch is controlled to be turned on.
2. The circuit of claim 1, wherein the second terminal of the first switch is connected to the sixth terminal of the over-discharge protection circuit, comprising:
the second end of the first switch is connected with the sixth end of the over-discharge protection circuit through a resistor.
3. The circuit of claim 1 or 2, wherein the first end of the over-discharge protection circuit is connected to the fifth end of the over-discharge protection circuit, comprising:
the first end of the over-discharge protection circuit is connected with the fifth end of the over-discharge protection circuit through a resistor.
4. The circuit of claim 1 or 2, wherein the first control module comprises:
the first end of the first control module is connected with the first end of the over-discharge protection circuit, and the second end of the first control module is connected with the control end of the first switch;
the first control module is used for: when the voltage of the first end is lower than the preset first voltage threshold value, outputting a first voltage signal to a control end of the first switch through the second end, wherein the first voltage signal is used for controlling the first switch to be turned off; when the voltage of the first end is not lower than the preset first voltage threshold, a second voltage signal is output to the control end of the first switch through the second end, and the second voltage signal is used for controlling the first switch to be conducted.
5. The circuit of claim 4, wherein the first switch comprises: and the control end of the switching tube is used as a first control end of the first switch.
6. The circuit of claim 4, wherein the first terminal of the first control module is connected to the first terminal of the over-discharge protection circuit, comprising:
the first end of the first control module is connected with the first end of the over-discharge protection circuit through a resistor.
7. A circuit according to claim 1 or 2, wherein the first voltage threshold is 2.4V.
8. A battery protection board, applied to an electronic device, the electronic device comprising a battery and an electric circuit, the electric circuit comprising: the battery electric quantity acquisition circuit, the first end and the second end of battery electric quantity acquisition circuit are used for carrying out the electric quantity sampling of battery, the second end is through steady voltage ground connection, its characterized in that, the battery protection shield includes the overdischarge protection circuit of any one of claims 1 to 7.
9. An electronic device, comprising: a battery and an electrical circuit, the electrical circuit comprising: the first end and the second end of the battery electric quantity acquisition circuit are used for sampling the electric quantity of the battery, and the second end is grounded through a voltage stabilizing tube; the electronic device further includes: the over-discharge protection circuit of any one of claims 1 to 7.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210165217.2A CN114243870B (en) | 2022-02-23 | 2022-02-23 | Over-discharge protection circuit, battery protection board and electronic equipment |
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| CN202210165217.2A CN114243870B (en) | 2022-02-23 | 2022-02-23 | Over-discharge protection circuit, battery protection board and electronic equipment |
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| CN114243870A CN114243870A (en) | 2022-03-25 |
| CN114243870B true CN114243870B (en) | 2023-07-21 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114256939B (en) * | 2022-02-25 | 2022-08-12 | 荣耀终端有限公司 | Over-discharge protection circuit, battery protection board and electronic equipment |
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| CN105655987A (en) * | 2015-09-28 | 2016-06-08 | 宇龙计算机通信科技(深圳)有限公司 | Cell protection circuit, cell and mobile terminal |
| CN113363943A (en) * | 2021-05-17 | 2021-09-07 | 深圳易马达科技有限公司 | Overcurrent protection circuit of battery and power supply equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN204216632U (en) * | 2014-11-27 | 2015-03-18 | 北京拓盛电子科技有限公司 | Battery discharge prevention circuit |
| CN105939039A (en) * | 2016-06-20 | 2016-09-14 | 深圳天珑无线科技有限公司 | Over-discharge early-warning circuit for battery and electronic equipment |
| CN107332319A (en) * | 2017-08-31 | 2017-11-07 | 努比亚技术有限公司 | Battery protecting circuit, battery and terminal |
| CN108039762B (en) * | 2018-01-12 | 2018-11-13 | 李雅柔 | The empty electric circuit of anti-battery in artificial intelligence charging battery of electric vehicle |
| CN208001152U (en) * | 2018-03-06 | 2018-10-23 | 广东乐心医疗电子股份有限公司 | Battery protection device and load device |
| CN108988464A (en) * | 2018-07-09 | 2018-12-11 | 合肥数理电子信息科技有限公司 | A kind of electric power detection display circuit for solar controller |
| US11979041B2 (en) * | 2020-01-08 | 2024-05-07 | GLF INTEGRATED POWER INC., a Delaware corporation | Methods and apparatuses for ultra-portable battery system protection and energy saving |
| CN212380975U (en) * | 2020-07-02 | 2021-01-19 | 福建科立讯通信有限公司 | Special explosion-proof battery of explosion-proof handheld digital intercom |
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| CN105655987A (en) * | 2015-09-28 | 2016-06-08 | 宇龙计算机通信科技(深圳)有限公司 | Cell protection circuit, cell and mobile terminal |
| CN113363943A (en) * | 2021-05-17 | 2021-09-07 | 深圳易马达科技有限公司 | Overcurrent protection circuit of battery and power supply equipment |
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