CN221007841U - High-voltage-resistant reverse connection detection circuit - Google Patents
High-voltage-resistant reverse connection detection circuit Download PDFInfo
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- CN221007841U CN221007841U CN202322698825.2U CN202322698825U CN221007841U CN 221007841 U CN221007841 U CN 221007841U CN 202322698825 U CN202322698825 U CN 202322698825U CN 221007841 U CN221007841 U CN 221007841U
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- 238000001514 detection method Methods 0.000 title claims abstract description 42
- 230000002401 inhibitory effect Effects 0.000 claims description 2
- 230000002457 bidirectional effect Effects 0.000 abstract description 9
- 239000003990 capacitor Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
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Abstract
The utility model relates to the technical field of rechargeable battery detection, in particular to a high-voltage-resistant reverse connection detection circuit, which is connected with a detected electrode through a reverse connection detection module and a current limiting circuit, wherein the protection circuit clamps the voltage of the input end of the detected electrode, a bidirectional TVS tube of the protection circuit can be selected according to the voltage range of a battery, the detection point position of the reverse connection detection module is close to 0V under the condition of positive connection of the battery, and the detection point position of the reverse connection detection module is close to 5V under the condition of reverse connection of the battery.
Description
Technical Field
The utility model relates to the technical field of rechargeable battery detection, in particular to a high-voltage-resistant reverse connection detection circuit.
Background
With the development of new energy automobiles, the voltage of the battery module is higher and higher. In battery formation and capacity division detection, a reverse connection detection circuit is needed to detect whether a battery module to be capacity-divided is reversely connected or not so as to protect a battery and capacity-division equipment.
The high-voltage-resistant reverse connection detection circuit commonly used in the market often needs to be provided with an isolation module, and the cost is high.
Disclosure of Invention
In order to overcome the defects, the utility model aims to provide a high-voltage-resistant reverse connection detection circuit which comprises a reverse connection detection module and a current limiting circuit,
The current limiting circuit is used for limiting the flow direction of the current of the electrode to be tested;
The reverse connection detection module comprises a detection point, and judges whether the electrode to be detected flowing through the current limiting circuit is reversely connected or not through the voltage of the detection point, a protection circuit is further arranged between the current limiting circuit and the electrode to be detected, and the protection circuit is connected with the electrode to be detected and used for inhibiting surge power and protecting a back-end circuit.
Further, the protection circuit comprises a bidirectional TVS tube.
Further, the reverse connection detection module is connected with a power supply.
In the utility model, the protection circuit clamps the voltage of the input end of the electrode to be tested by connecting the detection module and the current limiting circuit with the electrode to be tested in a reverse way. The bidirectional TVS tube of the protection circuit can be selected according to the voltage range of the battery, the detection point position of the reverse connection detection module is close to 0V under the condition that the battery is connected in the forward direction, the detection point position of the reverse connection detection module is close to 5V under the condition that the battery is connected in the reverse direction, and the circuit does not need an additional isolation module and can realize reverse connection detection with low cost and high voltage resistance of hundreds of volts.
Drawings
For ease of illustration, the utility model is described in detail by the following preferred embodiments and the accompanying drawings.
FIG. 1 is a block diagram of the internal circuit structure of the present utility model;
Fig. 2 is a schematic diagram of the circuit connection of the present utility model.
Description of the embodiments
The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
As shown in FIG. 1, the high-voltage-resistant reverse connection detection circuit comprises a reverse connection detection module, a current limiting circuit and a protection circuit.
As shown in fig. 2, the reverse connection detection module includes resistors R133 and R134, a capacitor C69, a triode Q18, and a detection point REV;
The current limiting circuit comprises a resistor R91, a capacitor C61, diodes D8, D16,
The protection circuit comprises a resistor R90 and a bidirectional TVS tube D20;
One end of the resistor R90 is connected with one pole of the battery to be tested, the other end of the resistor R90 is connected with the bidirectional TVS tube D20, and in the embodiment, the maximum working voltage of the bidirectional TVS tube D20 is 600V, and the other pole of the bidirectional TVS tube D20 is connected with the other pole of the battery to be tested; one end of a resistor R91 is connected with a resistor R90, the other end of the resistor R91 is connected with the cathode of a diode D8, the anode of the diode D8 is connected with the cathode of a diode D16, the cathode of the diode D16 is connected with the other electrode of the battery to be tested, the anode of a capacitor C61 is connected with the cathode of the diode D8, and the cathode of the capacitor C61 is connected with the anode of the diode D16; the base of triode Q18 links to each other with diode D8 positive pole, triode Q18's collecting electrode links to each other with testing point position REV, triode Q18's collecting electrode links to each other with the one end of resistance R133, triode Q18's projecting pole links to each other with the other pole of the battery that is surveyed, the 5v power is connected to the resistance R133 other end, resistance R134 one end links to each other with the 5v power, the other end links to each other with triode Q18's base, electric capacity C69 positive pole links to each other with triode Q18's base, and the other end links to each other with the other pole of the battery that is surveyed.
Under the condition that a battery to be tested is connected positively, the circuit passes through the positive electrode of the battery to the resistor R90, the resistor R91 and the diode D8, the diode D8 is in a reverse connection state, the circuit of the battery is cut off, at the moment, the base electrode of the triode Q18 has bias voltage provided by the resistor R134, the triode Q18 is conducted, the detection point REV is close to 0V, and the low level is achieved. When the battery is reversely connected, the loop goes from the positive electrode of the battery to the diode D16, the diode D8, the resistor R91 and the resistor R90 return to the negative electrode of the battery, the voltage of the base electrode of the triode Q18 is smaller than the voltage of the emitting electrode, and the triode is in a closed state. The detection point REV is close to 5V and is at high level. The diode D16 is a switching diode, has short reverse recovery time and can improve the sensitivity of reverse connection detection of the battery. And the bidirectional TVS tube D20 clamps the voltage of the input end of the battery, suppresses the introduced surge power, effectively protects a rear-end circuit and improves the circuit stability. The circuit determines whether the battery is reversely connected or not by detecting the high and low levels of the point REV, the capacitor C61 is a high-voltage-resistant capacitor, and the bidirectional TVS tube D20 is selected according to the battery voltage. The circuit can realize reverse connection detection with low cost and high voltage resistance of hundreds of volts.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.
Claims (3)
1. A high-voltage-resistant reverse connection detection circuit is characterized by comprising a reverse connection detection module and a current limiting circuit,
The current limiting circuit is used for limiting the flow direction of the current of the electrode to be tested;
The reverse connection detection module comprises a detection point, and judges whether the electrode to be detected flowing through the current limiting circuit is reversely connected or not through the voltage of the detection point, a protection circuit is further arranged between the current limiting circuit and the electrode to be detected, and the protection circuit is connected with the electrode to be detected and used for inhibiting surge power and protecting a back-end circuit.
2. The high voltage tolerant reverse connection detection circuit of claim 1 wherein said protection circuit comprises a bi-directional TVS tube.
3. The high voltage tolerant reverse connection detection circuit according to claim 1, wherein the reverse connection detection module is connected to a power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322698825.2U CN221007841U (en) | 2023-10-09 | 2023-10-09 | High-voltage-resistant reverse connection detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322698825.2U CN221007841U (en) | 2023-10-09 | 2023-10-09 | High-voltage-resistant reverse connection detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221007841U true CN221007841U (en) | 2024-05-24 |
Family
ID=91119171
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322698825.2U Active CN221007841U (en) | 2023-10-09 | 2023-10-09 | High-voltage-resistant reverse connection detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221007841U (en) |
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2023
- 2023-10-09 CN CN202322698825.2U patent/CN221007841U/en active Active
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