CN220273315U - Battery protection circuit - Google Patents
Battery protection circuit Download PDFInfo
- Publication number
- CN220273315U CN220273315U CN202321630780.9U CN202321630780U CN220273315U CN 220273315 U CN220273315 U CN 220273315U CN 202321630780 U CN202321630780 U CN 202321630780U CN 220273315 U CN220273315 U CN 220273315U
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- CN
- China
- Prior art keywords
- chip power
- battery
- current detection
- electrode
- detection amplifier
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000001514 detection method Methods 0.000 claims abstract description 26
- 238000005070 sampling Methods 0.000 claims abstract description 15
- 238000012423 maintenance Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Protection Of Static Devices (AREA)
Abstract
The utility model discloses a battery protection circuit, which comprises a battery, wherein the anode of the battery is connected with a sampling resistor, a current detection amplifier and a chip power switch MOSFET2; the positive electrode of the battery is connected with the S electrode of the chip power supply switch MOSFET2, the D electrode of the chip power supply MOSFET2 is connected with the current detection amplifier, a comparator is connected with the D electrode of the chip power supply, and the G electrode of the chip power supply is led out as a control connection end of the circuit; the two input ends of the current detection amplifier are respectively connected with two pins of the sampling resistor, and the output end of the current detection amplifier is connected with a positive input pin of the comparator; the negative input end of the comparator is provided with a reference voltage connection pin, the output end of the comparator is connected with a chip power MOSFET1, and the reference voltage connection pin is connected with a control pin G pole of the chip power MOSFET 1; the S pole of the chip power switch MOSFET1 is connected with the sampling resistor and the negative input of the current detection amplifier. The utility model has strong practicability.
Description
Technical Field
The utility model relates to the technical field of batteries, in particular to a battery protection circuit.
Background
For electronic devices that are required to meet intrinsic safety standards, the battery or battery pack thereof should pass the detection standards in GB/T3836.4-2021 regarding battery output short-circuit protection function, that is, the following conditions are satisfied: 1. after the battery output is short-circuited, the power supply of the battery is automatically cut off; 2. during the period from the short circuit of the battery output to the cutting off of the battery power supply, the current of the battery output needs to satisfy:
t·(i-3.3)≤260μj
in the above formula, t is time, and i is current. According to the above formula, for the equipment using battery power, the short-circuit current is controlled below 15A, and the power supply cut-off time is controlled within 20 mu s, so that the requirements of GB/T3836.4-2021 can be met.
The current common lithium battery is equipped with a related protection circuit, for example, the application with the application number of 202222050462.7, and the design scheme is an overcurrent protection circuit taking a special battery protection chip (such as S-8261 and the like) as a core, but when the output of the circuit is short-circuited, the circuit generally needs 200-300 mu S to turn off the output of the current, so that the requirement of GB/T3836.4-2021 cannot be met, and the circuit cannot be used for supplying power to intrinsically safe electronic equipment. To cut off current output within 20 mu s when battery output is short-circuited. A protection circuit with a current sampling amplifier as a core may be used. However, the response speed of the amplifier is high, and the amplifier can respond within 20 mu s, so that the requirements of GB/T3836.4-2021 are met. However, this approach comes at the cost of: the protection circuit needs to be started even when the equipment is not in operation, so that the battery electric quantity is consumed unnecessarily, and normal maintenance and use of the equipment are affected. A battery protection circuit is required to solve the above-described problems.
Disclosure of Invention
The utility model aims to provide a battery protection circuit, which is characterized in that a sampling resistor, a current detection amplifier and a chip power supply switch MOSFET2 are connected to the positive electrode of the battery, the positive electrode of the battery is connected with the S electrode of the chip power supply switch MOSFET2, the D electrode of the chip power supply MOSFET2 is connected with the current detection amplifier, and the D electrode of the chip power supply is connected with a comparator through the circuit design of the comparator.
The utility model is realized in the following way:
the battery protection circuit comprises a battery, wherein the anode of the battery is connected with a sampling resistor, a current detection amplifier and a chip power switch MOSFET2;
the positive electrode of the battery is connected with the S electrode of the chip power supply switch MOSFET2, the D electrode of the chip power supply MOSFET2 is connected with the current detection amplifier, a comparator is connected with the D electrode of the chip power supply, and the G electrode of the chip power supply is led out as a control connection end of the circuit;
the two input ends of the current detection amplifier are respectively connected with two pins of the sampling resistor, and the output end of the current detection amplifier is connected with a positive input pin of the comparator;
the negative input end of the comparator is provided with a reference voltage connection pin, the output end of the comparator is connected with a chip power MOSFET1, and the reference voltage connection pin is connected with a control pin G pole of the chip power MOSFET 1;
the S pole of the chip power switch MOSFET1 is connected with the sampling resistor and the negative input of the current detection amplifier, and the D pole is directly led out as the power output end of the circuit.
Further, the protection circuit pair is externally provided with five pins, namely CELL+, CELL-, BAT+, BAT-and CTRL-, and specifically is connected with the anode and the cathode of the battery respectively through CELL+ and CELL-, and is respectively provided with an anode, a cathode and a control end for external output through BAT+, BAT-and CTRL-.
Compared with the prior art, the utility model has the beneficial effects that: through the battery that sets up, the positive pole of battery is connected with sampling resistor, current detection amplifier and chip switch MOSFET2 to through the positive pole of battery with the S utmost point of chip switch MOSFET2 is connected, the D utmost point of chip power MOSFET2 is connected with current detection amplifier, and is connected with the circuit design of comparator through the D utmost point of chip power, this protection circuit need not open when equipment is inoperative, can not lead to the battery electric quantity to be meaningless consumption, does not influence the normal maintenance and the use of equipment, and child 'S current detection amplifier and comparator just can respond within 20 μs, satisfied GB/T3836.4-2021' S requirement, the utility model practicality is strong.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some examples of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic circuit configuration of the present utility model.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, based on the embodiments of the utility model, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the utility model. Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, based on the embodiments of the utility model, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the utility model.
Referring to fig. 1, a battery protection circuit includes a battery, wherein an anode of the battery is connected with a sampling resistor, a current detection amplifier and a chip power switch MOSFET2;
the positive electrode of the battery is connected with the S electrode of the chip power supply switch MOSFET2, the D electrode of the chip power supply MOSFET2 is connected with the current detection amplifier, a comparator is connected with the D electrode of the chip power supply, and the G electrode of the chip power supply is led out as a control connection end of the circuit;
the two input ends of the current detection amplifier are respectively connected with two pins of the sampling resistor, and the output end of the current detection amplifier is connected with a positive input pin of the comparator;
the negative input end of the comparator is provided with a reference voltage connection pin, the output end of the comparator is connected with a chip power MOSFET1, and the reference voltage connection pin is connected with a control pin G pole of the chip power MOSFET 1;
the S pole of the chip power switch MOSFET1 is connected with the sampling resistor and the negative input of the current detection amplifier, and the D pole is directly led out as the power output end of the circuit.
The protection circuit pair is externally provided with five pins, namely CELL+, CELL-, BAT+, BAT-and CTRL-, and is particularly connected with the anode and the cathode of the battery respectively through CELL+ and CELL-, and is respectively provided with an anode, a cathode and a control end for external output through BAT+, BAT-and CTRL-.
The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, and various modifications and variations may be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (2)
1. A battery protection circuit, characterized in that: the device comprises a battery, wherein the anode of the battery is connected with a sampling resistor, a current detection amplifier and a chip power switch MOSFET2;
the positive electrode of the battery is connected with the S electrode of the chip power supply switch MOSFET2, the D electrode of the chip power supply MOSFET2 is connected with the current detection amplifier, a comparator is connected with the D electrode of the chip power supply, and the G electrode of the chip power supply is led out as a control connection end of the circuit;
the two input ends of the current detection amplifier are respectively connected with two pins of the sampling resistor, and the output end of the current detection amplifier is connected with a positive input pin of the comparator;
the negative input end of the comparator is provided with a reference voltage connection pin, the output end of the comparator is connected with a chip power MOSFET1, and the reference voltage connection pin is connected with a control pin G pole of the chip power MOSFET 1;
the S pole of the chip power switch MOSFET1 is connected with the sampling resistor and the negative input of the current detection amplifier, and the D pole is directly led out as the power output end of the circuit.
2. The battery protection circuit according to claim 1, wherein the protection circuit is provided with five pins outside, namely CELL+, CELL-, BAT+, BAT-and CTRL-, respectively, specifically, the positive and negative electrodes of the battery are respectively connected through CELL+ and CELL-, and the positive and negative electrodes and the control terminal are respectively output through BAT+, BAT-and CTRL.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321630780.9U CN220273315U (en) | 2023-06-26 | 2023-06-26 | Battery protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321630780.9U CN220273315U (en) | 2023-06-26 | 2023-06-26 | Battery protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220273315U true CN220273315U (en) | 2023-12-29 |
Family
ID=89310885
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321630780.9U Active CN220273315U (en) | 2023-06-26 | 2023-06-26 | Battery protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220273315U (en) |
-
2023
- 2023-06-26 CN CN202321630780.9U patent/CN220273315U/en active Active
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