CN207967909U - A kind of BMS current detectings and protection circuit - Google Patents
A kind of BMS current detectings and protection circuit Download PDFInfo
- Publication number
- CN207967909U CN207967909U CN201820156478.7U CN201820156478U CN207967909U CN 207967909 U CN207967909 U CN 207967909U CN 201820156478 U CN201820156478 U CN 201820156478U CN 207967909 U CN207967909 U CN 207967909U
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Abstract
The utility model provides a kind of BMS current detectings and protection circuit, includes by power supply, motor and high precision sampling resistance main circuit in series；Current sampling circuit is connected to the both ends of the high precision sampling resistance, and acquisition flows through the electric current of resistance, and is converted into voltage signal；Voltage comparator circuit is connect with current sampling circuit, and the voltage signal is compared with a reference voltage, generates overcurrent protection signal；Current foldback circuit, including a MCU, connect with voltage comparator circuit and motor control terminal respectively, respond overcurrent protection signal, and send a control signal to the motor.The utility model, as control circuit, when detecting that electric current is excessive in circuit, can be immediately generated control signal control circuit and disconnected, greatly reduce the response time of overcurrent protection, the risk that circuit damages when thus greatly reducing overcurrent using pure hardware.
Description
Technical field
The utility model is related to electric vehicle detection field, more particularly to a kind of BMS current detectings and protection circuit.
Background technology
Electric vehicle is in unexpected acceleration, break turn, climbing, the rough pavement behavior of experience, internal circuit electricity
Stream can steeply rise, if do not increased current foldback circuit, then can danger close, mainboard is burnt when serious, cause short circuit and to operation
Personnel damage.In order to improve the control performance of electric vehicle, the safety of electric vehicle is improved, electric vehicle BMS controls are given
System processed, which increases current foldback circuit, to be particularly important.
Currently, BMS current diagnostic circuits on the market, after all using software diagnosis, the method for retransmiting cut-offing instruction,
Major defect has：Instruction is retransmited after judging based on software, delay is larger, and the high current for having the long period in circuit can be caused to deposit
It it is usually CPU several instruction cycles in, this time, the presence of this overcurrent time greatly increases the risk of damage circuit.
Utility model content
In view of this, the main purpose of the utility model is to provide a kind of BMS current detectings and protection circuit, use are pure
Hardware is as control circuit, when detecting that electric current is excessive in circuit, can be immediately generated control signal control circuit and disconnect, significantly
The response time for reducing overcurrent protection, the risk that circuit damages when thus greatly reducing overcurrent.
To achieve the above object, the technical scheme adopted by the utility model is that：
A kind of BMS current detectings and protection circuit include by power supply, motor and high precision sampling resistance master in series
Circuit；
Current sampling circuit is connected to the both ends of the high precision sampling resistance, and acquisition flows through the electric current of resistance, and converts
For voltage signal；
Voltage comparator circuit is connect with current sampling circuit, and the voltage signal is compared with a reference voltage, raw
At overcurrent protection signal；
Current foldback circuit, including a MCU, connect with voltage comparator circuit and motor control terminal respectively, and response overcurrent is protected
Signal is protected, and sends a control signal to the motor.
By upper, by current collection circuit, electric current is acquired, is exported as voltage form, voltage comparator circuit will be collected
Voltage signal outputs voltage signal to current foldback circuit compared with reference voltage, when current is excessive, MCU output controls
Signal drive motor control terminal disconnects.This programme, as control circuit, is not used software to calculate, prevented using pure hardware
Software runs the request for flying that breaking circuit is not responding to so as to cause software, greatly reduces the response time of overcurrent protection, reduced
The risk that circuit damages when stream.
It is further improved, the voltage comparator circuit includes a voltage comparator, and positive input connects the electric current
Sample circuit, reverse input end connect a reference voltage, and output end connects the MCU.
By upper, sampled voltage is compared by voltage comparator positive input with the reference voltage of reverse input end, and
Output voltage signal to MCU.
It is further improved, the motor control terminal includes a metal-oxide-semiconductor being connected in circuit, and source electrode is connecting power supply just
Pole, drain electrode connection motor, grid connect the MCU.
By upper, when MCU receives the voltage signal of voltage comparator output, control level signal is sent out to metal-oxide-semiconductor
Grid makes metal-oxide-semiconductor turn off, to protect disconnection motor main circuit.
It is further improved, a status monitoring circuit is connected between the output end of the voltage comparator and the MCU, including
One triode, one current-limiting resistance of base series connect the output end of voltage comparator, and collector one current-limiting resistance of series connection connects
Power supply is connect, collector is connected to the MCU, emitter ground connection.
By upper, status monitoring circuit can be used for detecting the working condition of current circuit, when the output end of voltage comparator is defeated
Go out voltage signal, driving triode is closed, and the status monitoring circuit turn-on, outputs voltage signal to MCU at this time.
It is further improved, the status monitoring circuit further includes an indicator light or alarm, is connected on power supply and triode
Collector between.
By upper, when main circuit current exception, indicator light or alarm can be used for sending out alarm signal.
Description of the drawings
Fig. 1 is the utility model BMS current detectings and protects the principle schematic of circuit.
Fig. 2 is the utility model BMS current detectings and protects the circuit diagram of circuit.
Specific implementation mode
The main purpose of the utility model is to provide a kind of BMS current detectings and protection circuits, using pure hardware conduct
Control circuit can be immediately generated control signal control circuit and disconnect, greatly reduce when detecting that electric current is excessive in circuit
The response time for flowing protection, the risk that circuit damages when thus greatly reducing overcurrent.
In the following, referring to such as Fig. 1 and as shown in Fig. 2, describing in detail to the utility model, which includes：
By power supply, metal-oxide-semiconductor Q1, motor M, high precision sampling resistance R0 motor circuit in series；
Current sampling circuit 100 is connected to the both ends the resistance R0, and acquisition flows through the electric current of resistance R0, and is converted into electricity
Pressure signal is exported to voltage comparator circuit 200；
Voltage comparator circuit 200, including a voltage comparator U1, positive input are connect with current sampling circuit 100,
Its reverse input end connects a reference voltage V REF, sampled voltage signal is compared with reference voltage V REF, when the electricity
When signal being pressed to be more than the reference voltage V REF, output overcurrent protection signal；
Current foldback circuit 300, including a MCU connect with the grid of the output end of voltage comparator U1 and metal-oxide-semiconductor Q1 respectively
It connects, responds overcurrent protection signal, and send a control signal to the motor；
A status monitoring circuit 400, including one or three poles are connected between the output end and the MCU of the voltage comparator U1
Pipe Q2, the output end of one current-limiting resistance R1 connection voltage comparators U1 of base series, one current-limiting resistance R2 of collector series connection
Power supply is connected, collector is connected to the MCU, emitter ground connection.
In the following, the operation principle of the utility model foregoing circuit is described in detail, include the following steps：
Current sampling circuit 100 and the electric current of motor circuit set a Function Mapping relationship, pass through sample motor circuit
Electric current converts and exports a voltage signal V0；
Voltage comparator circuit 200 receives an external reference voltages V1, by fixing the reference voltage value, adjusts motor circuit
In resistance R value or fixed resistance R, adjust reference voltage V 1 value；
When the voltage V0 that current sampling circuit 100 exports is more than reference voltage V 1,200 output overcurrent of voltage comparator circuit
For protection signal to status monitoring circuit 400, triode Q2 base stages receive level signal, triode Q2 conductings, collector output
Level signal to current foldback circuit 300 MCU；
MCU responds overcurrent protection signal, and the grid of outputs level signals to metal-oxide-semiconductor disconnects the main line of motor circuit, from
And play the purpose of overcurrent protection.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Within the spirit and principle of utility model, any modification, equivalent replacement, improvement and so on should be included in the utility model
Protection domain within.
Claims (5)
1. a kind of BMS current detectings and protection circuit, which is characterized in that including by power supply, motor and high precision sampling resistance string
Join the main circuit constituted；
Current sampling circuit is connected to the both ends of the high precision sampling resistance, and acquisition flows through the electric current of resistance, and is converted into electricity
Press signal；
Voltage comparator circuit is connect with current sampling circuit, and the voltage signal is compared with a reference voltage, was generated
Flow protection signal；
Current foldback circuit, including a MCU, connect with voltage comparator circuit and motor control terminal respectively, response overcurrent protection letter
Number, and send a control signal to the motor.
2. circuit according to claim 1, which is characterized in that the voltage comparator circuit includes a voltage comparator,
Positive input connects the current sampling circuit, and reverse input end connects a reference voltage, described in output end connection
MCU。
3. circuit according to claim 2, which is characterized in that the motor control terminal includes one being connected in circuit
Metal-oxide-semiconductor, source electrode connect positive pole, drain electrode connection motor, and grid connects the MCU.
4. circuit according to claim 3, which is characterized in that between the output end of the voltage comparator and the MCU
A status monitoring circuit, including a triode are connected, one current-limiting resistance of base series connects the output end of voltage comparator,
Collector one current-limiting resistance of series connection connects power supply, and collector is connected to the MCU, emitter ground connection.
5. circuit according to claim 4, which is characterized in that the status monitoring circuit further includes an indicator light or alarm
Device is connected between power supply and the collector of triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820156478.7U CN207967909U (en) | 2018-01-30 | 2018-01-30 | A kind of BMS current detectings and protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820156478.7U CN207967909U (en) | 2018-01-30 | 2018-01-30 | A kind of BMS current detectings and protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207967909U true CN207967909U (en) | 2018-10-12 |
Family
ID=63735955
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820156478.7U Expired - Fee Related CN207967909U (en) | 2018-01-30 | 2018-01-30 | A kind of BMS current detectings and protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207967909U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110601144A (en) * | 2019-10-12 | 2019-12-20 | 东莞市峰谷科技有限公司 | BMS current protection signal latch and reset circuit |
-
2018
- 2018-01-30 CN CN201820156478.7U patent/CN207967909U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110601144A (en) * | 2019-10-12 | 2019-12-20 | 东莞市峰谷科技有限公司 | BMS current protection signal latch and reset circuit |
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Legal Events
| 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: 20181012 Termination date: 20210130 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |