CN215267712U - Drive circuit for lithium battery control switch - Google Patents
Drive circuit for lithium battery control switch Download PDFInfo
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- CN215267712U CN215267712U CN202121369971.5U CN202121369971U CN215267712U CN 215267712 U CN215267712 U CN 215267712U CN 202121369971 U CN202121369971 U CN 202121369971U CN 215267712 U CN215267712 U CN 215267712U
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- resistor
- switch
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 41
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 41
- 239000003990 capacitor Substances 0.000 claims description 6
- 230000002159 abnormal effect Effects 0.000 description 5
- 238000001514 detection method Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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Abstract
The utility model relates to the technical field of lithium battery protection, and discloses a drive circuit for a lithium battery control switch, which comprises a first switch unit, a second switch unit and a third switch unit; the input end and the control end of the first switch unit are electrically connected with the reset signal input end, and the input end of the second switch unit is electrically connected with the control end of the first switch unit; the control end of the second switch unit is electrically connected with the driving signal input end, and the output end of the second switch unit is grounded; the control end of the third switch unit is electrically connected with the output end of the first switch unit, and the output end of the third switch unit is grounded; when the reset signal input end and the driving signal input end respectively input high level signals, the first switch unit, the second switch unit and the third switch unit are all switched on, and at the moment, the control signal output end directly outputs low level signals to enable the lithium battery to be disconnected with the control switch on the load circuit.
Description
Technical Field
The utility model relates to a lithium battery protection technical field, concretely relates to drive circuit that lithium cell control switch used.
Background
In a new energy automobile, a lithium battery is used as a power source of the whole automobile and is very important for the running of the automobile. In order to ensure the normal operation of the lithium battery, the lithium battery is mostly managed through a BMS management system, so that the charging current, the charging voltage, the discharging current, the discharging voltage and the temperature of the lithium battery are all in a reasonable range. At present car lithium cell is connected with the load through control switch, and the BMS administrative unit detects the current on the circuit of lithium cell and load through the current detection unit, and when the current of the circuit of lithium cell and load appears unusually, BMS management system lets control switch turn-off through drive circuit to this breaks off unusual lithium cell and load. Therefore, the driving circuit of the lithium battery for the existing automobile switch is controlled by the BMS management system, and a turn-off signal cannot be directly input to the control switch when the current on the line between the lithium battery and the load is abnormal.
SUMMERY OF THE UTILITY MODEL
In view of the not enough of background art, the utility model provides a drive circuit that lithium cell control switch used can be when the current on the circuit between lithium cell and load appears unusually direct control switch input turn-off signal between lithium cell and the load, makes control switch disconnection.
For solving the technical problem, the utility model provides a following technical scheme: a driving circuit for a lithium battery control switch comprises a first switch unit, a second switch unit and a third switch unit;
the input end of the first switch unit is electrically connected with the reset signal input end, the control end of the first switch unit is electrically connected with the reset signal input end through a first resistor, and the output end of the first switch unit is electrically connected with the control end of the third switch unit through a third resistor;
the input end of the second switch unit is electrically connected with the control end of the first switch unit through a second resistor; the control end of the second switch unit is electrically connected with the driving signal input end, and the output end of the second switch unit is grounded;
the control end of the third switching unit is grounded through a fourth resistor, the output end of the third switching unit is grounded, and the input end of the third switching unit is electrically connected with the control signal output end;
when the reset signal input end and the driving signal input end respectively input a first state signal, the first switch unit, the second switch unit and the third switch unit are all conducted; when the reset signal is a second state signal, the first switch unit, the second switch unit and the third switch unit are all turned off.
In one embodiment, the first state signal is a high level signal and the second state signal is a low level signal.
In one embodiment, the first switch unit, the second switch unit and the third switch unit are all triodes.
In one embodiment, the first switching unit is a PNP type transistor, and the second switching unit and the third switching unit are both NPN type transistors.
In one embodiment, the control terminal of the second switch unit is electrically connected to one terminal of a capacitor C1 and one terminal of a fifth resistor, respectively, and the other terminal of the fifth resistor and the other terminal of the capacitor C1 are both grounded.
In one embodiment, the driving signal input terminal is electrically connected to one end of a sixth resistor and one end of a seventh resistor, respectively, the other end of the sixth resistor is electrically connected to the control terminal of the second switch unit, and the other end of the first resistor is electrically connected to the power supply.
In one embodiment, the control terminal of the second switch unit is electrically connected to one terminal of an eighth resistor, the other terminal of the eighth resistor is electrically connected to the cathode of a diode D1, and the anode of the diode D1 is grounded through a ninth resistor.
When the lithium battery is in actual use, a current abnormal signal can be input into the driving signal input end, namely, a signal output by the current detection unit is input into the driving signal input end, when a high level signal is input into the driving signal input end, if a high level signal is input into the reset signal input end, the first switch unit, the second switch unit and the third switch unit are conducted, the control signal output end is grounded, a low level signal is output from the control signal output end, when the low level signal is output from the control signal output end, the control switch between the lithium battery and the load is turned off, and when the low level signal is not output from the control signal output end, the control switch between the lithium battery and the load is conducted.
When the first switch unit, the second switch unit and the third switch unit are all turned on, if a high level signal input by the reset signal input end is changed into a low level signal, the first switch unit, the second switch unit and the third switch unit are all turned off, the control signal output end is not grounded, and the control signal output end does not output the low level signal.
Compared with the prior art, the utility model beneficial effect who has is: when the current on the line between the lithium battery and the load is abnormal, the control signal output end outputs a low-level signal to disconnect a control switch between the lithium battery and the load, the lithium battery is not driven by a BMS management system, and the protection speed is high.
Drawings
Fig. 1 is a circuit diagram of the present invention.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic drawings and illustrate the basic structure of the present invention only in a schematic manner, and thus show only the components related to the present invention.
As shown in fig. 1, the driving circuit for controlling the switch of the lithium battery includes transistors Q1, Q2, and Q3, wherein the transistor Q1 is a first switch unit, the transistor Q2 is a second switch unit, and the transistor Q3 is a third switch unit.
The transistor Q1 is a PNP transistor, and the transistors Q2 and Q3 are NPN transistors. An emitter of the transistor Q1 is electrically connected to the reset signal input terminal SHUT _ RST, a base of the transistor Q1 is electrically connected to the reset signal input terminal SHUT _ RST through a first resistor R1, a base of the transistor Q1 is electrically connected to a collector of the transistor Q2 through a second resistor R2, and a collector of the transistor Q1 is electrically connected to a base of the transistor Q3 through a third resistor R3.
The base of the triode Q2 is electrically connected to the driving signal input terminal O1 through a sixth resistor R6, and the driving signal input terminal O1 is also electrically connected to a power supply V _ ON through a seventh resistor R7, where the power supply V _ ON is 3.3V dc voltage.
The base electrode of the triode Q2 is also electrically connected with one end of a fifth resistor R5 and one end of a capacitor C1, and the other end of the fifth resistor R5, the other end of the capacitor C1 and the emitter electrode of the triode Q2 are all grounded.
The base of the triode Q2 is electrically connected with one end of the eighth resistor R8, the other end of the eighth resistor R8 is electrically connected with the cathode of the diode D1, and the anode of the diode D1 is grounded through the ninth resistor R9.
The base of the transistor Q3 is also electrically connected to the emitter of the transistor Q3 through a fourth resistor R4, the emitter of the transistor Q3 is grounded, and the collector of the transistor Q3 is electrically connected to the control signal output port SHORT _ PRT through a tenth resistor.
In this embodiment, the collector of the transistor Q1 is also electrically connected to the short-circuit protection signal output terminal SHUT _ DWON.
When the reset signal input terminal SHUT _ RST and the driving signal input terminal O1 input the first state signal, respectively, the first switching unit, the second switching unit, and the third switching unit are all turned on; when the reset signal input terminal SHUT _ RST inputs the second state signal, the first switching unit, the second switching unit, and the third switching unit are all turned off.
In actual use, the first state signal is a high level signal, and the second state signal is a low level signal.
When the lithium battery is practically used, a current abnormal signal can be input into the driving signal input end, namely a signal output by the current detection unit is input into the driving signal input end, when a high level signal is input into the driving signal input end, if a high level signal is input into the reset signal input end, the first switch unit, the second switch unit and the third switch unit are conducted, the control signal output end is grounded, a low level signal is output from the control signal output end, when a low level signal is output from the control signal output end, the control switch between the lithium battery and the load is turned off, and when a low level signal is not output from the control signal output end, the control switch between the lithium battery and the load is conducted.
When the first switch unit, the second switch unit and the third switch unit are all turned on, if a high level signal input by the reset signal input end is changed into a low level signal, the first switch unit, the second switch unit and the third switch unit are all turned off, the control signal output end is not grounded, and the control signal output end does not output the low level signal.
In addition, when the triodes Q1, Q2 and Q3 are all turned on, the SHORT-circuit protection signal output terminal SHUT _ DWON outputs a high-level SHORT-circuit protection signal, the SHORT-circuit protection signal can be input to the main control MCU of the BMS management system, the main control MCU can input a low-level signal to the reset signal input terminal SHUT _ RST within time T when detecting the SHORT-circuit protection signal, and the triodes Q1, Q2 and Q3 are turned off, so that the control switch between the lithium battery and the load is turned on briefly, if the current is still abnormal after time T, the control signal output terminal SHORT _ PRT outputs a low-level signal to turn off the control switch, and at this time, the main control MCU continues to receive the high-level SHORT-circuit protection signal. Therefore, in practical use, when the main control unit stops inputting the low level signal to the reset signal input end SHUT _ RST for N times continuously, the short circuit protection signal output by the short circuit protection signal output end SHUT _ DWON is received, the main control unit does not input the low level signal to the reset signal input end SHUT _ RST any more, the lithium battery is completely disconnected with the circuit of the load, and the connection between the lithium battery and the load can be recovered when the current protection is triggered mistakenly through the method.
In light of the above, the present invention is not limited to the above embodiments, and various changes and modifications can be made by the worker without departing from the scope of the present invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (7)
1. A drive circuit for a lithium battery control switch is characterized in that: the circuit comprises a first switch unit, a second switch unit and a third switch unit;
the input end of the first switch unit is electrically connected with the reset signal input end, the control end of the first switch unit is electrically connected with the reset signal input end through a first resistor, and the output end of the first switch unit is electrically connected with the control end of the third switch unit through a third resistor;
the input end of the second switch unit is electrically connected with the control end of the first switch unit through a second resistor; the control end of the second switch unit is electrically connected with the driving signal input end, and the output end of the second switch unit is grounded;
the control end of the third switching unit is grounded through a fourth resistor, the output end of the third switching unit is grounded, and the input end of the third switching unit is electrically connected with the control signal output end;
when the reset signal input end and the driving signal input end respectively input a first state signal, the first switch unit, the second switch unit and the third switch unit are all conducted; when the reset signal is a second state signal, the first switch unit, the second switch unit and the third switch unit are all turned off.
2. The driving circuit for the lithium battery control switch according to claim 1, wherein: the first state signal is a high level signal, and the second state signal is a low level signal.
3. The driving circuit for the lithium battery control switch according to claim 1, wherein: the first switch unit, the second switch unit and the third switch unit are all triodes.
4. The driving circuit for the lithium battery control switch according to claim 3, wherein: the first switch unit is a PNP type triode, and the second switch unit and the third switch unit are both NPN type triodes.
5. The drive circuit for the lithium battery control switch according to claim 3 or 4, characterized in that: and the control end of the second switch unit is respectively and electrically connected with one end of a capacitor C1 and one end of a fifth resistor, and the other end of the fifth resistor and the other end of the capacitor C1 are both grounded.
6. The driving circuit for the lithium battery control switch according to claim 5, wherein: the driving signal input end is respectively and electrically connected with one end of a sixth resistor and one end of a seventh resistor, the other end of the sixth resistor is electrically connected with the control end of the second switch unit, and the other end of the first resistor is electrically connected with a power supply.
7. The driving circuit for the lithium battery control switch according to claim 6, wherein: the control end of the second switch unit is electrically connected with one end of an eighth resistor, the other end of the eighth resistor is electrically connected with the cathode of a diode D1, and the anode of the diode D1 is grounded through a ninth resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121369971.5U CN215267712U (en) | 2021-06-18 | 2021-06-18 | Drive circuit for lithium battery control switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121369971.5U CN215267712U (en) | 2021-06-18 | 2021-06-18 | Drive circuit for lithium battery control switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215267712U true CN215267712U (en) | 2021-12-21 |
Family
ID=79481079
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121369971.5U Expired - Fee Related CN215267712U (en) | 2021-06-18 | 2021-06-18 | Drive circuit for lithium battery control switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215267712U (en) |
-
2021
- 2021-06-18 CN CN202121369971.5U patent/CN215267712U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20211221 |
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| CF01 | Termination of patent right due to non-payment of annual fee |