CN219592132U - Reverse charging protection circuit, protection circuit and electronic equipment - Google Patents
Reverse charging protection circuit, protection circuit and electronic equipment Download PDFInfo
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- CN219592132U CN219592132U CN202223509368.XU CN202223509368U CN219592132U CN 219592132 U CN219592132 U CN 219592132U CN 202223509368 U CN202223509368 U CN 202223509368U CN 219592132 U CN219592132 U CN 219592132U
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- protection circuit
- lithium battery
- mos tube
- battery protection
- circuit
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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
Abstract
The utility model discloses a reverse charging protection circuit, a protection circuit and electronic equipment. The anti-charge protection circuit comprises a switch circuit and a protection resistor, one end of the switch circuit is connected with the grid electrode of a discharge MOS tube in the lithium battery protection circuit, the other end of the switch circuit is connected with the output positive electrode of the lithium battery protection circuit, and the other end of the switch circuit is connected with the output negative electrode of the lithium battery protection circuit through the protection resistor; the switching circuit is used for conducting when reverse voltage is applied to the output end of the lithium battery protection circuit, so that a discharge MOS tube in the lithium battery protection circuit is closed, and the lithium battery protection circuit is reversely charged and protected; and preventing leakage current from flowing into the lithium battery protection circuit. The circuit connection mode can carry out reverse charging protection on the lithium battery protection circuit after the lithium battery protection circuit applies a reverse charging voltage, and can cut off a leakage current loop so as to avoid the situation of leakage power feeding of the lithium battery.
Description
Technical Field
The present utility model relates to the field of battery protection technologies, and in particular, to a reverse charging protection circuit, a protection circuit, and an electronic device.
Background
Because of the requirement of the lithium battery protection board on the anti-charge protection, an additional design circuit is required for the anti-charge protection.
Referring to fig. 1, in the prior art, a MOS transistor Q13 is generally used for reverse charging protection, and due to a parasitic diode effect inside the MOS transistor Q13, after reverse charging protection, leakage current flows to a gate control pin of a discharge MOS transistor of a lithium battery protection circuit through a diode in the MOS transistor Q13, and then flows to a battery cathode through an internal circuit of the lithium battery protection circuit to form a loop, so that lithium battery feed is caused.
Disclosure of Invention
In order to solve the technical problem that the existing anti-charge protection circuit can cause lithium battery feed, the embodiment of the utility model provides an anti-charge protection circuit, a protection circuit and electronic equipment.
The technical scheme of the embodiment of the utility model is realized as follows:
the embodiment of the utility model provides a reverse charging protection circuit, which comprises:
the lithium battery protection circuit comprises a switching circuit and a protection resistor, wherein one end of the switching circuit is connected with a grid electrode of a discharge MOS tube in the lithium battery protection circuit, the other end of the switching circuit is connected with an output positive electrode of the lithium battery protection circuit, and the other end of the switching circuit is connected with an output negative electrode of the lithium battery protection circuit through the protection resistor;
the switching circuit is used for conducting when reverse voltage is applied to the output end of the lithium battery protection circuit, so that a discharge MOS tube in the lithium battery protection circuit is closed, and the lithium battery protection circuit is reversely charged and protected; and preventing leakage current from flowing into the lithium battery protection circuit.
In one embodiment, the switching circuit includes:
and the collector electrode of the triode is connected with the grid electrode of the discharge MOS tube in the lithium battery protection circuit, the emitter electrode of the triode is connected with the output positive electrode of the lithium battery protection circuit, and the base electrode of the triode is connected with the output negative electrode of the lithium battery protection circuit through the protection resistor.
In one embodiment, the switching circuit includes:
the lithium battery protection circuit comprises a first MOS tube and a second MOS tube, wherein a source electrode of the first MOS tube is connected with a grid electrode of a discharge MOS tube in the lithium battery protection circuit, a drain electrode of the first MOS tube is connected with a drain electrode of the second MOS tube, a grid electrode of the first MOS tube is connected with a grid electrode of the second MOS tube, a grid electrode of the second MOS tube is connected with an output negative electrode of the lithium battery protection circuit through a protection resistor, and a source electrode of the second MOS tube is connected with an output positive electrode of the lithium battery protection circuit.
In one embodiment, the switching circuit includes:
the source electrode of the third MOS tube is connected with the output positive electrode of the lithium battery protection circuit, the grid electrode of the third MOS tube is connected with the output negative electrode of the lithium battery protection circuit through the protection resistor, the drain electrode of the third MOS tube is connected with the negative electrode of the diode, and the positive electrode of the diode is connected with the grid electrode of the discharge MOS tube in the lithium battery protection circuit.
The embodiment of the utility model also provides a protection circuit, which comprises:
a reverse charging protection circuit and a lithium battery protection circuit;
the lithium battery protection circuit is used for protecting the circuit by controlling the power-on MOS tube and/or the discharging MOS tube in the lithium battery protection circuit to be closed when the current in the circuit is abnormal;
the anti-charge protection circuit is used for conducting the switch circuit when the output end of the lithium battery protection circuit applies reverse voltage, so that a discharge MOS tube in the lithium battery protection circuit is closed, and the lithium battery protection circuit is subjected to anti-charge protection; and preventing leakage current from flowing into the lithium battery protection circuit.
In one embodiment, the anti-charge protection circuit comprises a switch circuit and a protection resistor, wherein the switch circuit comprises a triode;
the collector of the triode is connected with the grid electrode of the discharge MOS tube in the lithium battery protection circuit, the emitter of the triode is connected with the output anode of the lithium battery protection circuit, and the base of the triode is connected with the output cathode of the lithium battery protection circuit through the protection resistor.
In an embodiment, the anti-charge protection circuit comprises a switch circuit and a protection resistor, wherein the switch circuit comprises a first MOS tube and a second MOS tube;
the source electrode of the first MOS tube is connected with the grid electrode of the discharge MOS tube in the lithium battery protection circuit, the drain electrode of the first MOS tube is connected with the drain electrode of the second MOS tube, the grid electrode of the first MOS tube is connected with the grid electrode of the second MOS tube, the grid electrode of the second MOS tube is also connected with the output cathode of the lithium battery protection circuit through the protection resistor, and the source electrode of the second MOS tube is connected with the output anode of the lithium battery protection circuit.
In an embodiment, the anti-charge protection circuit comprises a switch circuit and a protection resistor, wherein the switch circuit comprises a third MOS tube and a diode;
the source electrode of the third MOS tube is connected with the output positive electrode of the lithium battery protection circuit, the grid electrode of the third MOS tube is connected with the output negative electrode of the lithium battery protection circuit through the protection resistor, the drain electrode of the third MOS tube is connected with the negative electrode of the diode, and the positive electrode of the diode is connected with the grid electrode of the discharge MOS tube in the lithium battery protection circuit.
The embodiment of the utility model also provides electronic equipment, which comprises the anti-charge protection circuit.
The embodiment of the utility model also provides electronic equipment, which comprises the protection circuit.
The anti-charge protection circuit comprises a switch circuit and a protection resistor, wherein one end of the switch circuit is connected with a grid electrode of a discharge MOS tube in the lithium battery protection circuit, the other end of the switch circuit is connected with an output positive electrode of the lithium battery protection circuit, and the other end of the switch circuit is connected with an output negative electrode of the lithium battery protection circuit through the protection resistor; the switching circuit is used for conducting when reverse voltage is applied to the output end of the lithium battery protection circuit, so that a discharge MOS tube in the lithium battery protection circuit is closed, and the lithium battery protection circuit is reversely charged and protected; and preventing leakage current from flowing into the lithium battery protection circuit. The circuit connection mode can carry out reverse charging protection on the lithium battery protection circuit after the lithium battery protection circuit applies a reverse charging voltage, and can cut off a leakage current loop so as to avoid the situation of leakage power feeding of the lithium battery.
Drawings
FIG. 1 is a schematic diagram of a connection mode of a reverse charge protection circuit in the prior art;
FIG. 2 is a schematic diagram illustrating the connection of a first anti-charge protection circuit according to an embodiment of the present utility model;
FIG. 3 is a schematic diagram illustrating connection of a second anti-charge protection circuit according to an embodiment of the present utility model;
FIG. 4 is a schematic diagram illustrating a third exemplary reverse charge protection circuit according to the present utility model;
fig. 5 is a schematic connection diagram of a fourth anti-charge protection circuit according to an embodiment of the utility model.
Detailed Description
The present utility model will be described in further detail with reference to the accompanying drawings and examples.
First embodiment
Referring to fig. 2, an embodiment of the present utility model provides a first anti-charge protection circuit, including:
the lithium battery protection circuit comprises a switch circuit 11 and a protection resistor 12, wherein one end of the switch circuit 11 is connected with a grid electrode of a discharge MOS tube in the lithium battery protection circuit, the other end of the switch circuit 11 is connected with an output positive electrode of the lithium battery protection circuit, and the other end of the switch circuit 11 is connected with an output negative electrode of the lithium battery protection circuit through the protection resistor 12;
the switch circuit 11 is configured to, when a reverse voltage is applied to an output end of the lithium battery protection circuit, switch the switch circuit 11 on, so that a discharge MOS tube in the lithium battery protection circuit is turned off, and perform reverse charging protection on the lithium battery protection circuit; and preventing leakage current from flowing into the lithium battery protection circuit.
Specifically, the switching circuit 11 in this embodiment may be a triode, or may be a first MOS transistor and a second MOS transistor, or may be a third MOS transistor and a diode.
In this embodiment, the existing anti-charge protection circuit (such as the circuit shown in fig. 1) is improved, and after the MOS transistor is replaced by the switch circuit 11, the leakage current loop can be cut off, so as to avoid the situation of leakage power feeding of the lithium battery.
When the battery with the lithium battery protection circuit is reversely charged, namely, after a reverse charging voltage is applied to the output end of the lithium battery protection circuit, the switch circuit 11 in the embodiment is conducted under the reverse charging voltage, the discharging MOS tube of the lithium battery protection circuit is closed, and the reverse charging circuit is cut off, so that the purpose of reverse charging protection is achieved.
After the reverse charge protection, the detection pin of the lithium battery protection circuit is pulled up to the positive electrode of the battery through a resistor with a certain resistance value in the IC; the use of the switch circuit 11 can prevent leakage current from flowing to the gate control pin (DO) of the discharge MOS tube of the lithium battery protection circuit through the switch circuit 11, and then flowing to the battery cathode through the DO pin to form a loop, so that leakage current is caused. Therefore, the embodiment can prevent the lithium battery from protecting the post-feeding.
Second embodiment
In practical application, the switching circuit may be a triode.
Referring to fig. 3, an embodiment of the present utility model provides a second anti-charge protection circuit, including:
the lithium battery protection circuit comprises a triode Q2 and a protection resistor R6, wherein a collector electrode of the triode Q2 is connected with a grid electrode of a discharge MOS tube in the lithium battery protection circuit, an emitter electrode of the triode Q2 is connected with an output positive electrode of the lithium battery protection circuit, and a base electrode of the triode Q2 is connected with an output negative electrode of the lithium battery protection circuit through the protection resistor R6;
the triode Q2 is used for conducting when reverse voltage is applied to the output end of the lithium battery protection circuit, so that a discharge MOS tube in the lithium battery protection circuit is closed, and the lithium battery protection circuit is reversely charged and protected; and preventing leakage current from flowing into the lithium battery protection circuit.
In the embodiment, the triode Q2 and the protection resistor R6 are connected with a lithium battery protection circuit to carry out reverse charge protection on the lithium battery protection circuit and prevent battery leakage feed.
When negative voltage is applied to the output positive electrode of the lithium battery protection circuit and positive voltage is applied to the output negative electrode of the lithium battery protection circuit, the triode Q2 works in a saturated mode, the collector electrode and the emitter electrode of the triode Q2 are conducted, and meanwhile, the grid control pin of the discharge MOS tube in the lithium battery protection circuit is pulled down, so that the discharge MOS tube is closed, and a discharge loop of the positive electrode of the battery is cut off, so that the purpose of anti-charge protection is achieved.
After the reverse charge protection, the detection pin of the lithium battery protection circuit is pulled up to the positive electrode of the battery through a resistor with a certain resistance value in the IC; the use of the triode Q2 can prevent leakage current from flowing to the grid control pin (DO) of the discharge MOS tube of the lithium battery protection circuit through the triode Q2, and then flowing to the negative electrode of the battery through the DO pin to form a loop, so that leakage current is caused. Therefore, the embodiment can prevent the lithium battery from protecting the post-feeding.
Namely, the embodiment can add the anti-charging protection function to the lithium battery protection circuit, and can also solve the problem of electric leakage after the anti-charging protection and prevent the feeding problem of the lithium battery.
Third embodiment
In practical application, the switch circuit can be a first MOS tube and a second MOS tube.
Referring to fig. 4, an embodiment of the present utility model provides a third anti-charge protection circuit, including:
the lithium battery protection circuit comprises a first MOS tube Q2, a second MOS tube Q13 and a protection resistor R6, wherein the source electrode of the first MOS tube Q2 is connected with the grid electrode of a discharge MOS tube in the lithium battery protection circuit, the drain electrode of the first MOS tube Q2 is connected with the drain electrode of the second MOS tube Q13, the grid electrode of the first MOS tube Q2 is connected with the grid electrode of the second MOS tube Q13, the grid electrode of the second MOS tube Q13 is also connected with the output cathode of the lithium battery protection circuit through the protection resistor R6, and the source electrode of the second MOS tube Q13 is connected with the output anode of the lithium battery protection circuit;
the first MOS transistor Q2 and the second MOS transistor Q13 are configured to conduct the first MOS transistor Q2 and the second MOS transistor Q13 when a reverse voltage is applied to an output end of the lithium battery protection circuit, so that a discharge MOS transistor in the lithium battery protection circuit is turned off, and reverse charging protection is performed on the lithium battery protection circuit; and preventing leakage current from flowing into the lithium battery protection circuit.
In this embodiment, the first MOS transistor Q2, the second MOS transistor Q13, and the protection resistor R6 are connected to the lithium battery protection circuit, so as to perform reverse charge protection on the lithium battery protection circuit and prevent battery leakage and power feeding.
When the negative voltage is applied to the output positive electrode of the lithium battery protection circuit and the positive voltage is applied to the output negative electrode of the lithium battery protection circuit, the first MOS tube Q2 and the second MOS tube Q13 are switched on, and meanwhile, the grid control pin of the discharging MOS tube in the lithium battery protection circuit is pulled down, so that the discharging MOS tube is closed, and a discharging loop of the battery positive electrode is cut off, so that the purpose of anti-charge protection is achieved.
After the reverse charge protection, the detection pin of the lithium battery protection circuit is pulled up to the positive electrode of the battery through a resistor with a certain resistance value in the IC; the first MOS tube Q2 and the second MOS tube Q13 are used for preventing leakage current from flowing to a grid control pin (DO) of a discharge MOS tube of the lithium battery protection circuit through the first MOS tube Q2 and the second MOS tube Q13, and then flowing to a battery cathode through the DO pin to form a loop, so that leakage current is caused. Therefore, the embodiment can prevent the lithium battery from protecting the post-feeding.
Namely, the embodiment can add the anti-charging protection function to the lithium battery protection circuit, and can also solve the problem of electric leakage after the anti-charging protection and prevent the feeding problem of the lithium battery.
Fourth embodiment
In practical application, the switch circuit may be a third MOS transistor and a diode.
Referring to fig. 5, an embodiment of the present utility model provides a fourth anti-charge protection circuit, including:
the lithium battery protection circuit comprises a third MOS tube Q13, a diode D1 and a protection resistor R6, wherein the source electrode of the third MOS tube Q13 is connected with the output positive electrode of the lithium battery protection circuit, the grid electrode of the third MOS tube Q13 is connected with the output negative electrode of the lithium battery protection circuit through the protection resistor R6, the drain electrode of the third MOS tube Q13 is connected with the negative electrode of the diode D1, and the positive electrode of the diode D1 is connected with the grid electrode of a discharge MOS tube in the lithium battery protection circuit;
the third MOS transistor Q13 and the diode D1 are configured to conduct the third MOS transistor Q13 and the diode D1 when a reverse voltage is applied to the output end of the lithium battery protection circuit, so that the discharge MOS transistor in the lithium battery protection circuit is turned off, and the lithium battery protection circuit is reverse-charged and protected; and preventing leakage current from flowing into the lithium battery protection circuit.
In this embodiment, the third MOS transistor Q13, the diode D1, and the protection resistor R6 are connected to the lithium battery protection circuit, so as to perform reverse charge protection on the lithium battery protection circuit and prevent battery leakage and power feeding.
When the negative voltage is applied to the output positive electrode of the lithium battery protection circuit and the positive voltage is applied to the output negative electrode of the lithium battery protection circuit, the third MOS tube Q13 and the diode D1 are conducted, and meanwhile the grid control pin of the discharging MOS tube in the lithium battery protection circuit is pulled down, so that the discharging MOS tube is closed, and a discharging loop of the positive electrode of the battery is cut off, so that the purpose of anti-charge protection is achieved.
After the reverse charge protection, the detection pin of the lithium battery protection circuit is pulled up to the positive electrode of the battery through a resistor with a certain resistance value in the IC; the third MOS transistor Q13 and the diode D1 are used for preventing leakage current from flowing to the grid control pin (DO) of the discharge MOS transistor of the lithium battery protection circuit through the third MOS transistor Q13 and the diode D1, and then flowing to the negative electrode of the battery through the DO pin to form a loop, so that leakage current is caused. Therefore, the embodiment can prevent the lithium battery from protecting the post-feeding.
Namely, the embodiment can add the anti-charging protection function to the lithium battery protection circuit, and can also solve the problem of electric leakage after the anti-charging protection and prevent the feeding problem of the lithium battery.
The reverse charging protection circuit provided by the embodiment of the utility model comprises a switching circuit and a protection resistor, wherein one end of the switching circuit is connected with a grid electrode of a discharge MOS tube in a lithium battery protection circuit, the other end of the switching circuit is connected with an output positive electrode of the lithium battery protection circuit, and the other end of the switching circuit is connected with an output negative electrode of the lithium battery protection circuit through the protection resistor; the switching circuit is used for conducting when reverse voltage is applied to the output end of the lithium battery protection circuit, so that a discharge MOS tube in the lithium battery protection circuit is closed, and the lithium battery protection circuit is reversely charged and protected; and preventing leakage current from flowing into the lithium battery protection circuit. The circuit connection mode can carry out reverse charging protection on the lithium battery protection circuit after the lithium battery protection circuit applies a reverse charging voltage, and can cut off a leakage current loop so as to avoid the situation of leakage power feeding of the lithium battery.
In addition, an embodiment of the present utility model provides a protection circuit including:
a lithium battery protection circuit and a reverse charging protection circuit;
the lithium battery protection circuit is used for protecting the circuit by controlling the power-on MOS tube and/or the discharging MOS tube in the lithium battery protection circuit to be closed when the current in the circuit is abnormal;
the anti-charge protection circuit is used for conducting the switch circuit when the output end of the lithium battery protection circuit applies reverse voltage, so that a discharge MOS tube in the lithium battery protection circuit is closed, and the lithium battery protection circuit is subjected to anti-charge protection; and preventing leakage current from flowing into the lithium battery protection circuit.
In one embodiment, the anti-charge protection circuit comprises a switch circuit and a protection resistor, wherein the switch circuit comprises a triode;
the collector of the triode is connected with the grid electrode of the discharge MOS tube in the lithium battery protection circuit, the emitter of the triode is connected with the output anode of the lithium battery protection circuit, and the base of the triode is connected with the output cathode of the lithium battery protection circuit through the protection resistor.
In an embodiment, the anti-charge protection circuit comprises a switch circuit and a protection resistor, wherein the switch circuit comprises a first MOS tube and a second MOS tube;
the source electrode of the first MOS tube is connected with the grid electrode of the discharge MOS tube in the lithium battery protection circuit, the drain electrode of the first MOS tube is connected with the drain electrode of the second MOS tube, the grid electrode of the first MOS tube is connected with the grid electrode of the second MOS tube, the grid electrode of the second MOS tube is also connected with the output cathode of the lithium battery protection circuit through the protection resistor, and the source electrode of the second MOS tube is connected with the output anode of the lithium battery protection circuit.
In an embodiment, the anti-charge protection circuit comprises a switch circuit and a protection resistor, wherein the switch circuit comprises a third MOS tube and a diode;
the source electrode of the third MOS tube is connected with the output positive electrode of the lithium battery protection circuit, the grid electrode of the third MOS tube is connected with the output negative electrode of the lithium battery protection circuit through the protection resistor, the drain electrode of the third MOS tube is connected with the negative electrode of the diode, and the positive electrode of the diode is connected with the grid electrode of the discharge MOS tube in the lithium battery protection circuit.
The details of the anti-charge protection circuit are described in the above embodiments, and are not repeated here.
In addition, the embodiment of the utility model provides electronic equipment, which comprises the anti-charge protection circuit.
In addition, an embodiment of the utility model provides an electronic device, which includes the protection circuit described in any one of the above.
It should be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises an element.
The foregoing is merely exemplary of the present utility model and is not intended to limit the present utility model. Various modifications and variations of the present utility model will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are to be included in the scope of the claims of the present utility model.
Claims (10)
1. A reverse charge protection circuit, the reverse charge protection circuit comprising:
the lithium battery protection circuit comprises a switching circuit and a protection resistor, wherein one end of the switching circuit is connected with a grid electrode of a discharge MOS tube in the lithium battery protection circuit, the other end of the switching circuit is connected with an output positive electrode of the lithium battery protection circuit, and the other end of the switching circuit is connected with an output negative electrode of the lithium battery protection circuit through the protection resistor;
the switching circuit is used for conducting when reverse voltage is applied to the output end of the lithium battery protection circuit, so that a discharge MOS tube in the lithium battery protection circuit is closed, and the lithium battery protection circuit is reversely charged and protected; and preventing leakage current from flowing into the lithium battery protection circuit.
2. The reverse charge protection circuit of claim 1, wherein the switching circuit comprises:
and the collector electrode of the triode is connected with the grid electrode of the discharge MOS tube in the lithium battery protection circuit, the emitter electrode of the triode is connected with the output positive electrode of the lithium battery protection circuit, and the base electrode of the triode is connected with the output negative electrode of the lithium battery protection circuit through the protection resistor.
3. The reverse charge protection circuit of claim 1, wherein the switching circuit comprises:
the lithium battery protection circuit comprises a first MOS tube and a second MOS tube, wherein a source electrode of the first MOS tube is connected with a grid electrode of a discharge MOS tube in the lithium battery protection circuit, a drain electrode of the first MOS tube is connected with a drain electrode of the second MOS tube, a grid electrode of the first MOS tube is connected with a grid electrode of the second MOS tube, a grid electrode of the second MOS tube is connected with an output negative electrode of the lithium battery protection circuit through a protection resistor, and a source electrode of the second MOS tube is connected with an output positive electrode of the lithium battery protection circuit.
4. The reverse charge protection circuit of claim 1, wherein the switching circuit comprises:
the source electrode of the third MOS tube is connected with the output positive electrode of the lithium battery protection circuit, the grid electrode of the third MOS tube is connected with the output negative electrode of the lithium battery protection circuit through the protection resistor, the drain electrode of the third MOS tube is connected with the negative electrode of the diode, and the positive electrode of the diode is connected with the grid electrode of the discharge MOS tube in the lithium battery protection circuit.
5. A protection circuit, the protection circuit comprising:
a reverse charging protection circuit and a lithium battery protection circuit;
the lithium battery protection circuit is used for protecting the circuit by controlling the power-on MOS tube and/or the discharging MOS tube in the lithium battery protection circuit to be closed when the current in the circuit is abnormal;
the anti-charge protection circuit is used for conducting the switch circuit when the output end of the lithium battery protection circuit applies reverse voltage, so that the discharge MOS tube in the lithium battery protection circuit is closed, and the lithium battery protection circuit is subjected to anti-charge protection; and preventing leakage current from flowing into the lithium battery protection circuit.
6. The protection circuit of claim 5, wherein the anti-charge protection circuit comprises a switching circuit and a protection resistor, the switching circuit comprising a transistor;
the collector of the triode is connected with the grid electrode of the discharge MOS tube in the lithium battery protection circuit, the emitter of the triode is connected with the output anode of the lithium battery protection circuit, and the base of the triode is connected with the output cathode of the lithium battery protection circuit through the protection resistor.
7. The protection circuit of claim 5, wherein the anti-charge protection circuit comprises a switching circuit and a protection resistor, the switching circuit comprising a first MOS transistor and a second MOS transistor;
the source electrode of the first MOS tube is connected with the grid electrode of the discharge MOS tube in the lithium battery protection circuit, the drain electrode of the first MOS tube is connected with the drain electrode of the second MOS tube, the grid electrode of the first MOS tube is connected with the grid electrode of the second MOS tube, the grid electrode of the second MOS tube is also connected with the output cathode of the lithium battery protection circuit through the protection resistor, and the source electrode of the second MOS tube is connected with the output anode of the lithium battery protection circuit.
8. The protection circuit of claim 5, wherein the reverse charge protection circuit comprises a switching circuit and a protection resistor, the switching circuit comprising a third MOS transistor and a diode;
the source electrode of the third MOS tube is connected with the output positive electrode of the lithium battery protection circuit, the grid electrode of the third MOS tube is connected with the output negative electrode of the lithium battery protection circuit through the protection resistor, the drain electrode of the third MOS tube is connected with the negative electrode of the diode, and the positive electrode of the diode is connected with the grid electrode of the discharge MOS tube in the lithium battery protection circuit.
9. An electronic device comprising the anti-charge protection circuit of any one of claims 1-4.
10. An electronic device comprising the protection circuit of any one of claims 5-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223509368.XU CN219592132U (en) | 2022-12-27 | 2022-12-27 | Reverse charging protection circuit, protection circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223509368.XU CN219592132U (en) | 2022-12-27 | 2022-12-27 | Reverse charging protection circuit, protection circuit and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219592132U true CN219592132U (en) | 2023-08-25 |
Family
ID=87698041
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223509368.XU Active CN219592132U (en) | 2022-12-27 | 2022-12-27 | Reverse charging protection circuit, protection circuit and electronic equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219592132U (en) |
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2022
- 2022-12-27 CN CN202223509368.XU patent/CN219592132U/en active Active
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