CN112968426A - Voltage spike suppression circuit and battery protection circuit - Google Patents

Voltage spike suppression circuit and battery protection circuit Download PDF

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Publication number
CN112968426A
CN112968426A CN202011608252.4A CN202011608252A CN112968426A CN 112968426 A CN112968426 A CN 112968426A CN 202011608252 A CN202011608252 A CN 202011608252A CN 112968426 A CN112968426 A CN 112968426A
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China
Prior art keywords
unit
voltage
electrically connected
terminal
load
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CN202011608252.4A
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Chinese (zh)
Inventor
何勇吉
杜红霞
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Joulwatt Technology Hangzhou Co Ltd
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Joulwatt Technology Hangzhou Co Ltd
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Priority to CN202011608252.4A priority Critical patent/CN112968426A/en
Publication of CN112968426A publication Critical patent/CN112968426A/en
Pending legal-status Critical Current

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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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
    • H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
    • 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
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • 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
    • H02J7/00308—Overvoltage protection

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

The application provides a voltage spike suppression circuit and a battery protection circuit, wherein the voltage spike suppression circuit comprises a first resistance unit, a first switch unit and a voltage comparison unit, wherein the first resistance unit is used for being connected between a first end and a second end of a load; the first switch unit is connected in series or in parallel with the first resistance unit; the voltage comparison unit is used for controlling the state of the first switch unit to change so that current passes through the first resistance unit under the condition that the difference value of the instantaneous voltage and the average voltage is greater than a preset voltage; the instantaneous voltage is an instantaneous sampling voltage between the first end of the load and the second end of the load, and the average voltage is an average value of the voltage between the first end of the load and the second end of the load in a certain time window. The circuit plays a good role in inhibiting oscillation of voltage spikes of the chip.

Description

Voltage spike suppression circuit and battery protection circuit
Technical Field
The application relates to the field of multi-string battery protection circuits, in particular to a voltage spike suppression circuit and a battery protection circuit.
Background
In the application of multiple strings of battery protection chips, the operation of plugging and unplugging the battery cables is often performed. Because the bus and the chip have parasitic inductance and a first capacitor, the bus and the chip are easy to oscillate in the plugging process to generate voltage spikes, and the voltage may exceed the differential withstand voltage of adjacent pins, thereby threatening the safety of the chip. As shown in fig. 1 and 2.
The above information disclosed in this background section is only for enhancement of understanding of the background of the technology described herein and, therefore, certain information may be included in the background that does not form the prior art that is already known in this country to a person of ordinary skill in the art.
Disclosure of Invention
The main objective of the present application is to provide a voltage spike suppression circuit and a battery protection circuit, so as to solve the problem of voltage spike caused by plugging and unplugging a battery cable in the prior art.
In order to achieve the above object, according to one aspect of the present application, there is provided a voltage spike suppression circuit including:
a first resistance unit for connecting between a first terminal and a second terminal of a load;
a first switching unit connected in series or in parallel with the first resistance unit;
the voltage comparison unit is used for controlling the state change of the first switch unit to enable current to pass through the first resistance unit under the condition that the difference value of the instantaneous voltage and the average voltage is larger than a preset voltage; the instantaneous voltage is an instantaneous sampling voltage between the first end of the load and the second end of the load, and the average voltage is an average value of the voltage between the first end of the load and the second end of the load in a certain time window.
Optionally, a first end of the first switching unit is electrically connected to a first end of the voltage comparing unit, a second end of the first switching unit is electrically connected to a first end of the first resistance unit, a second end of the first resistance unit is electrically connected to a second end of the voltage comparing unit, a third end of the first switching unit is electrically connected to a third end of the voltage comparing unit, and the voltage comparing unit controls the first switching unit to be turned on when a difference between the instantaneous voltage and the average voltage is greater than the predetermined voltage.
Optionally, the circuit further includes a second switch unit, a first end of the second switch unit is electrically connected to the second end of the first resistor unit, and a second end of the second switch unit is electrically connected to the second end of the voltage comparing unit.
Optionally, the second switch unit includes a diode, a cathode of the diode is electrically connected to the second end of the first resistor unit, and an anode of the diode is electrically connected to the second end of the voltage comparison unit.
Optionally, the first switch unit is connected in parallel to two ends of the first resistor unit, a first end of the voltage comparison unit is used for being electrically connected to a first end of the load, a first end of the first switch unit is used for being electrically connected to a second end of the load, a second end of the first switch unit is electrically connected to a second end of the voltage comparison unit, a third end of the first switch unit is electrically connected to a third end of the voltage comparison unit, and the voltage comparison unit controls the first switch unit to be turned off when a difference between the instantaneous voltage and the average voltage is greater than the predetermined voltage.
Optionally, the circuit further includes a second resistance unit, a first end of the second resistance unit is electrically connected to the first end of the voltage comparison unit, and a second end of the second resistance unit is electrically connected to the third end of the first switch unit.
Optionally, the voltage comparison unit includes a capacitor module, a resistor module and a switch module, the first end of the capacitor module is used for being electrically connected to the first end of the load, the second end of the capacitor module is electrically connected to the first end of the resistor module, the second end of the resistor module is used for being electrically connected to the second end of the load, the first end of the switch module is electrically connected to the first end of the resistor module, the second end of the switch module is electrically connected to the second end of the resistor module, and the third end of the switch module is electrically connected to the third end of the first switch unit.
Optionally, the switch module includes a transistor.
Optionally, the circuit further includes a capacitor unit, a second resistor unit and a third resistor unit, the first end of the capacitor unit is electrically connected to the first end of the capacitor module, the second end of the capacitor unit is electrically connected to the second end of the resistor module, the first end of the second resistor unit is electrically connected to the second end of the first capacitor unit, the second end of the second resistor unit is electrically connected to the second end of the resistor module, the first end of the third resistor unit is electrically connected to the first end of the first capacitor unit, and the second end of the third resistor unit is electrically connected to the first end of the capacitor module.
Optionally, the first switching unit includes a MOS transistor.
In order to achieve the above object, according to another aspect of the present application, there is also provided a battery protection circuit including a voltage spike suppression circuit, the voltage spike suppression circuit being any one of the circuits.
The application discloses voltage spike suppression circuit, including first resistance unit, first switch element and voltage comparison unit, the voltage comparison unit is used for instantaneous voltage with the difference of average voltage is greater than under the condition of predetermined voltage, also under the condition of plug battery winding displacement, control first switch element state changes, so that the electric current passes through first resistance unit, even get first resistance unit switches on for the resistance of circuit increases, thereby has played the effect of better suppression oscillation to the voltage spike of load, has alleviated the problem that plug battery winding displacement caused the voltage spike among the prior art, has guaranteed that the security of load is better.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. In the drawings:
fig. 1 is a schematic diagram illustrating a conventional flat cable plugging/unplugging method for a multi-string battery protection circuit;
FIG. 2 shows a schematic diagram of a prior art multi-string battery protection circuit;
FIGS. 3-4 show schematic diagrams of voltage spike suppression circuits according to two embodiments of the present application, respectively;
FIGS. 5-6 illustrate voltage spike suppression circuit schematic diagrams, respectively, according to two specific embodiments of the present application;
fig. 7 shows a schematic diagram of a comparison of the voltage waveform of a prior art multi-string battery protection circuit with the voltage waveform of the battery protection circuit of the present application.
Wherein the figures include the following reference numerals:
10. a first resistance unit; 20. a first switch unit; 30. a voltage comparison unit; 40. a level shifter; 100. a load first end; 101. a second end of the load.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
It will be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" another element, it can be directly on the other element or intervening elements may also be present. Also, in the specification and claims, when an element is described as being "connected" to another element, the element may be "directly connected" to the other element or "connected" to the other element through a third element.
As described in the background of the invention, in the prior art, voltage spikes are caused by plugging and unplugging the battery cable, and in order to solve the above problems, the present application provides a voltage spike suppression circuit and a battery protection circuit.
According to an exemplary embodiment of the present application, a voltage spike suppression circuit is provided, as shown in fig. 3 and 4, the voltage spike suppression circuit includes a first resistance unit 10, a first switch unit 20, and a voltage comparison unit 30, wherein the first resistance unit 10 is configured to be connected between a first end 100 of a load and a second end 101 of the load; the first switching unit 20 is connected in series or in parallel with the first resistance unit 10; the voltage comparing unit 30 is configured to be connected between the first end 100 of the load and the second end 101 of the load, the voltage comparing unit 30 is electrically connected to the first switching unit 20, and the voltage comparing unit 30 is configured to control the first switching unit 20 to change its state so that a current passes through the first resistance unit 10 when a difference between an instantaneous voltage and an average voltage is greater than a predetermined voltage, the instantaneous voltage is an instantaneous sampling voltage between the first end of the load and the second end of the load, and the average voltage is an average value of voltages between the first end of the load and the second end of the load within a certain time window.
The voltage spike suppression circuit comprises a first resistance unit, a first switch unit and a voltage comparison unit, wherein the voltage comparison unit is used for controlling the state of the first switch unit to change under the condition that the difference value between the instantaneous voltage and the average voltage is greater than the preset voltage, namely under the condition that the battery flat cable is plugged and unplugged, so that current passes through the first resistance unit, namely the first resistance unit is conducted, the resistance of the circuit is increased, the voltage spike of a load is well suppressed, the problem of voltage spike caused by plugging and unplugging the battery flat cable in the prior art is solved, and the safety of the load is better ensured.
According to a specific embodiment of the present invention, as shown in fig. 3, a first terminal of the first switch unit 20 is electrically connected to a first terminal of the voltage comparison unit 30, a second terminal of the first switch unit 20 is electrically connected to a first terminal of the first resistor unit 10, a second terminal of the first resistor unit 10 is electrically connected to a second terminal of the voltage comparison unit 30, that is, the first switch unit 20 is connected in series with the first resistor unit 10, a third terminal of the first switch unit 20 is electrically connected to a third terminal of the voltage comparison unit 30, and the voltage comparison unit 30 controls the first switch unit 20 to be closed when a difference between the instantaneous voltage and the average voltage is greater than the predetermined voltage. In the circuit, the first switch unit is connected in series with the first resistor unit, and the voltage comparison unit controls the first switch unit to be closed when a voltage spike is generated, so that the first resistor unit is connected between the first end and the second end of the load, thereby further ensuring a good oscillation suppression effect and further relieving the problem of poor load safety.
In an actual application process, the first end of the load is connected to the negative electrode of the power supply, the second end of the load is connected to the positive electrode of the power supply, and the first end of the load and the second end of the load may be connected in reverse. The second switch unit only allows the current from the second end of the load to the first end of the load to pass through, so that reverse current can be effectively blocked, and the load damage caused by the reverse connection of the first end of the load and the second end of the load can be avoided.
Of course, the first end of the load may be connected to the positive pole of the power supply, and the second end of the load may be connected to the negative pole of the power supply, in which case, the second switch unit only allows the current from the first end of the load to pass through the second end of the load.
In order to further ensure effective blocking of reverse current, in a specific embodiment, as shown in fig. 5, the second switch unit includes a diode D1, a cathode of the diode D1 is electrically connected to the second end of the first resistor unit 10, and an anode of the diode D1 is electrically connected to the second end of the voltage comparison unit 30. Of course, the second switch unit may further include other devices conducting in a single direction.
In practical applications, as shown in fig. 5, the second switch unit is a diode D1.
According to another specific embodiment of the present invention, as shown in fig. 4, the first switch unit is connected in parallel to both ends of the first resistor unit, the first end of the voltage comparator unit is electrically connected to the first end of the load, the first end of the first switch is electrically connected to the second end of the load, the second end of the first switch unit is electrically connected to the second end of the voltage comparator unit, the third end of the first switch unit is electrically connected to the third end of the voltage comparator unit, and the voltage comparator unit controls the first switch unit to be turned off when the difference between the instantaneous voltage and the average voltage is greater than the predetermined voltage. In the circuit, the first switch unit is connected in parallel with the first resistor unit, and the voltage comparison unit controls the first switch unit to be switched off when a voltage spike is generated, so that the first resistor unit is connected between the first end and the second end of the load, and the oscillation suppression effect is further ensured to be good, and the problem of poor load safety is further alleviated.
In another specific embodiment of the present application, the circuit further includes a second resistor unit, a first end of the second resistor unit is electrically connected to the first end of the voltage comparing unit, and a second end of the second resistor unit is electrically connected to the third end of the first switch unit.
In practical applications, as shown in fig. 5 and fig. 6, the second resistance unit includes a fourth resistor R4, but the second resistance unit may also include other components. In another specific embodiment, the second resistor unit is a fourth resistor R4.
In another specific embodiment of the present application, the voltage comparing unit includes a capacitor module, a resistor module, and a switch module, wherein a first end of the capacitor module is electrically connected to the first end of the load, a second end of the capacitor module is electrically connected to the first end of the resistor module, a second end of the resistor module is electrically connected to the second end of the load, a first end of the switch module is electrically connected to the first end of the resistor module, a second end of the switch module is electrically connected to the second end of the resistor module, and a third end of the switch module is electrically connected to the third end of the first switch unit. The voltage comparison unit obtains the average voltage through the capacitor module and the resistor module, and drives the switch module to be closed when the difference between the instantaneous voltage and the average voltage is greater than the predetermined voltage, and the first switch unit is closed when the switch module is closed, so that the first resistor unit is connected to the first end and the second end of the load when a voltage spike occurs, and the voltage comparison unit can well inhibit oscillation of the voltage spike.
In practical applications, as shown in fig. 5 and 6, the capacitor module includes a first capacitor C1, the resistor module includes a third resistor R3, and the switch module includes a transistor Q2. Of course, the capacitor module may further include other components, the resistor module may also include other components, and the switch module may also include other three-terminal switch devices, such as MOS transistors.
Because the devices such as a level shifter and the like in the chip may have an anti-parallel parasitic diode path, in order to inhibit the reverse current of the anti-parallel parasitic diode path and avoid the threat of the reverse current to the safety of the chip, according to another specific embodiment of the present application, the circuit further comprises a capacitor unit, a second resistor unit and a third resistor unit, the first end of the capacitor unit is electrically connected with the first end of the capacitor module, the second end of the capacitor unit is electrically connected with the second end of the resistor module, a first end of the second resistance unit is electrically connected with a second end of the first capacitance unit, a second end of the second resistance unit is electrically connected with a second end of the resistance module, the first end of the third resistance unit is electrically connected with the first end of the first capacitor unit, and the second end of the third resistance unit is electrically connected with the first end of the capacitor module. The second resistance unit and the third resistance unit play a good role in suppressing reverse current.
According to another specific embodiment of the present application, as shown in fig. 5 and 6, the capacitor unit includes a second capacitor C2, the second resistor unit includes a second resistor R2, and the third resistor unit includes a fifth resistor R5. Of course, the capacitor unit, the second resistor unit, and the third resistor unit may include other components.
In a specific embodiment of the present application, as shown in fig. 5 and 6, the capacitor unit is a second capacitor C2, the second resistor unit is a second resistor R2, and the third resistor unit is a fifth resistor R5.
In practical applications, as shown in fig. 5 and 6, the first switch unit includes a MOS transistor Q1, and the first resistor unit includes a first resistor R1. Of course, the first switch unit may further include other three-terminal switch devices, such as a transistor, and those skilled in the art may set the three-terminal switch devices according to actual situations.
In a specific embodiment, when the first switch unit is connected in series with the first resistor unit, as shown in fig. 5, the first switch unit is a MOS transistor Q1, which may be an NMOS transistor, and the first resistor unit is a first resistor. In the case where the first switching unit is connected in parallel to the first resistance unit, as shown in fig. 6, the first switching unit may be a MOS transistor Q1, specifically, a PMOS transistor, and the first resistance unit may be a first resistor.
In another specific embodiment, as shown in fig. 5 and 6, the capacitor module is a first capacitor C1, the resistor module is a third resistor R3, the switch module is a transistor Q2, and the first switch unit is a MOS transistor Q1. The third resistor R3 and the first capacitor C1 form a filter circuit, and the average value of the voltage between the first end and the second end of the load, namely the average voltage, is obtained; when the transient voltage VB rises due to oscillation, the voltage VT rises accordingly, and the voltage VA does not suddenly change due to the third resistor R3 and the first capacitor C1. When the predetermined voltage is set to 0.6V, in fig. 5, when VT > (VA +0.6V), the MOS transistor Q1 and the transistor Q2 are turned on, and the first resistor R1 is connected to the circuit to suppress LC oscillation. In fig. 6, when VT > (VA +0.6V), the driving transistor Q2 is turned on, the MOS switch Q1 is turned off, and the first resistor R1 is connected to the circuit to suppress LC oscillation. Of course, the predetermined voltage may have other values.
According to another exemplary embodiment of the present application, there is also provided a battery protection circuit including a voltage spike suppression circuit, the voltage spike suppression circuit being any one of the above circuits.
The battery protection circuit comprises any one of the voltage spike suppression circuits, when the battery protection circuit is used for plugging and unplugging the battery flat cable, the current passes through the first resistance unit, namely the first resistance unit is conducted, so that the resistance of the circuit is increased, the voltage spike of the chip is well suppressed, the problem of voltage spike caused by plugging and unplugging the battery flat cable in the prior art is solved, the safety of the chip is guaranteed to be good, and the influence of the voltage spike on the safety of the chip is effectively relieved.
In a specific embodiment, as shown in fig. 3 to 6, the battery protection circuit may further include a level shifter 40, and two ends of the level shifter 40 are electrically connected to two ends of the voltage comparison unit 30, respectively.
Fig. 7 is a graph showing a comparison of voltage waveforms obtained by the battery protection circuit according to fig. 2 and the battery protection circuit according to the present application, wherein the abscissa is time and the ordinate is voltage values of the first terminal of the load and the second terminal of the load, and it can be seen from fig. 7 that the voltage spike phenomenon is well alleviated.
From the above description, it can be seen that the above-described embodiments of the present application achieve the following technical effects:
1) the voltage spike suppression circuit comprises a first resistance unit, a first switch unit and a voltage comparison unit, wherein the voltage comparison unit is used for controlling the state change of the first switch unit under the condition that the difference value of the instantaneous voltage and the average voltage is greater than the preset voltage, namely under the condition of plugging and unplugging the battery flat cable, so that the current passes through the first resistance unit, namely the first resistance unit is conducted, the resistance of the circuit is increased, the voltage spike of the load plays a role in better suppressing oscillation, the problem of voltage spike caused by plugging and unplugging the battery flat cable in the prior art is solved, and the safety of the load is better ensured.
2) The utility model provides a battery protection circuit, including any kind of foretell voltage peak suppression circuit, above-mentioned battery protection circuit makes the electric current pass through above-mentioned first resistance unit when plug battery winding displacement, make above-mentioned first resistance unit switch on, make the resistance increase of circuit, thereby voltage peak to the chip has played the effect of suppressing oscillation better, the problem of voltage peak is caused to plug battery winding displacement among the prior art has been alleviated, the security of having guaranteed the chip is better, the influence that voltage peak caused the chip safety has been alleviated effectively.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (11)

1. A voltage spike suppression circuit, comprising:
a first resistance unit for connecting between a first terminal and a second terminal of a load;
a first switching unit connected in series or in parallel with the first resistance unit;
the voltage comparison unit is used for controlling the state change of the first switch unit to enable current to pass through the first resistance unit under the condition that the difference value of the instantaneous voltage and the average voltage is larger than a preset voltage; the instantaneous voltage is an instantaneous sampling voltage between the first end of the load and the second end of the load, and the average voltage is an average value of the voltage between the first end of the load and the second end of the load in a certain time window.
2. The circuit of claim 1, wherein a first terminal of the first switch unit is electrically connected to a first terminal of the voltage comparison unit, a second terminal of the first switch unit is electrically connected to a first terminal of the first resistance unit, a second terminal of the first resistance unit is electrically connected to a second terminal of the voltage comparison unit, a third terminal of the first switch unit is electrically connected to a third terminal of the voltage comparison unit, and the voltage comparison unit controls the first switch unit to close when a difference between the instantaneous voltage and the average voltage is greater than the predetermined voltage.
3. The circuit of claim 2, further comprising a second switching unit, a first terminal of the second switching unit being electrically connected to the second terminal of the first resistance unit, and a second terminal of the second switching unit being electrically connected to the second terminal of the voltage comparison unit.
4. The circuit of claim 3, wherein the second switch unit comprises a diode, a cathode of the diode is electrically connected to the second terminal of the first resistor unit, and an anode of the diode is electrically connected to the second terminal of the voltage comparison unit.
5. The circuit of claim 1, wherein the first switch unit is connected in parallel across the first resistor unit, the first terminal of the voltage comparator unit is configured to be electrically connected to the first terminal of the load, the first terminal of the first switch unit is configured to be electrically connected to the second terminal of the load, the second terminal of the first switch unit is electrically connected to the second terminal of the voltage comparator unit, the third terminal of the first switch unit is electrically connected to the third terminal of the voltage comparator unit, and the voltage comparator unit controls the first switch unit to be turned off when the difference between the instantaneous voltage and the average voltage is greater than the predetermined voltage.
6. The circuit of claim 1, further comprising a second resistance unit, wherein a first terminal of the second resistance unit is electrically connected to the first terminal of the voltage comparison unit, and a second terminal of the second resistance unit is electrically connected to the third terminal of the first switch unit.
7. The circuit according to any one of claims 1 to 6, wherein the voltage comparison unit comprises a capacitor module, a resistor module and a switch module, a first end of the capacitor module is electrically connected to the first end of the load, a second end of the capacitor module is electrically connected to the first end of the resistor module, a second end of the resistor module is electrically connected to the second end of the load, a first end of the switch module is electrically connected to the first end of the resistor module, a second end of the switch module is electrically connected to the second end of the resistor module, and a third end of the switch module is electrically connected to the third end of the first switch unit.
8. The circuit of claim 7, wherein the switching module comprises a transistor.
9. The circuit of claim 7, further comprising a capacitive element, a second resistive element, and a third resistive element, wherein a first end of the capacitive element is electrically connected to a first end of the capacitive module, a second end of the capacitive element is electrically connected to a second end of the resistive module, a first end of the second resistive element is electrically connected to a second end of the first capacitive element, a second end of the second resistive element is electrically connected to a second end of the resistive module, a first end of the third resistive element is electrically connected to a first end of the first capacitive element, and a second end of the third resistive element is electrically connected to a first end of the capacitive module.
10. The circuit of claim 1, wherein the first switching unit comprises a MOS transistor.
11. A battery protection circuit, comprising:
a voltage spike suppression circuit as claimed in any one of claims 1 to 10.
CN202011608252.4A 2020-12-29 2020-12-29 Voltage spike suppression circuit and battery protection circuit Pending CN112968426A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011608252.4A CN112968426A (en) 2020-12-29 2020-12-29 Voltage spike suppression circuit and battery protection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011608252.4A CN112968426A (en) 2020-12-29 2020-12-29 Voltage spike suppression circuit and battery protection circuit

Publications (1)

Publication Number Publication Date
CN112968426A true CN112968426A (en) 2021-06-15

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011608252.4A Pending CN112968426A (en) 2020-12-29 2020-12-29 Voltage spike suppression circuit and battery protection circuit

Country Status (1)

Country Link
CN (1) CN112968426A (en)

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Address after: Room 901-23, 9 / F, west 4 building, Xigang development center, 298 Zhenhua Road, Sandun Town, Xihu District, Hangzhou City, Zhejiang Province, 310030

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Address before: Room 901-23, 9 / F, west 4 building, Xigang development center, 298 Zhenhua Road, Sandun Town, Xihu District, Hangzhou City, Zhejiang Province, 310030

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