CN208094168U - A kind of motor control fail-safe circuit and device - Google Patents
A kind of motor control fail-safe circuit and device Download PDFInfo
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- CN208094168U CN208094168U CN201820570252.1U CN201820570252U CN208094168U CN 208094168 U CN208094168 U CN 208094168U CN 201820570252 U CN201820570252 U CN 201820570252U CN 208094168 U CN208094168 U CN 208094168U
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Abstract
The utility model discloses a kind of motor control fail-safe circuit and devices; the wherein described motor control fail-safe circuit includes current detection module, control module and switch drive module; wherein; the current detection module is used to acquire the current signal in switch drive module, to export corresponding feedback signal；The control module generates corresponding control signal for receiving the feedback signal；The switch drive module includes driving unit and switch unit, and the driving unit is for receiving the control signal to control the turn-on and turn-off of the switch unit, to the working condition for the motor that control is electrical connected with the switch unit.The utility model more can precisely effectively detect short-circuit conditions, and carry out corresponding electric motor protecting.
Description
Technical field
The utility model is related to circuit field more particularly to a kind of motor control fail-safe circuits and device.
Background technology
In current electromechanics trade, the market demand of brushless motor is big, and application field is wide, is in the hair of a sustainable growth
The duration of an exhibition.While brushless control technology applies increasingly mature, the client the next high to the performance requirement of brushless motor, in addition to cost
Outside constantly declining, brushless motor accuracy, stability, reliability, safety etc. become client's focus of attention.If motor controls
Metal-oxide-semiconductor short circuit in circuit or failure, then can cause extreme influence, more serious is that can lead to control circuit to motor operation
Or motor is damaged or is burnt, and then lead to the generation of major safety problems.
Invention content
In view of this, the technical problem to be solved by the present invention is to provide one kind more precisely to effectively detect
Short-circuit conditions, and carry out the motor control fail-safe circuit and device of corresponding electric motor protecting.
In order to solve the above-mentioned technical problem, the utility model is realized using following scheme：
In a first aspect, the utility model provides a kind of motor control fail-safe circuit, including current detection module, control
Molding block and switch drive module, wherein
The current detection module is used to acquire the current signal in switch drive module, to export corresponding feedback letter
Number；
The control module generates corresponding control signal for receiving the feedback signal；
The switch drive module includes driving unit and switch unit, and the driving unit is for receiving the control
Signal is to control the turn-on and turn-off of the switch unit, to the work for the motor that control is electrical connected with the switch unit
State.
Further, the current detection module includes operational amplifier U4B, resistance R44, resistance R45, resistance R46, electricity
Hinder R47, capacitance C33, capacitance C34 and capacitance C35, the sampled output of one end and the switch unit of the resistance R44
It is connected, the other end of the resistance R44 is connected with the normal phase input end of the operational amplifier U4B, and the resistance R44's is another
End is also grounded by capacitance C33；One end of the resistance R45 is connected with the first direct-flow input end, the other end of the resistance R45
It is connected with the negative-phase input of the operational amplifier U4B, the other end of the resistance R45 is also grounded by resistance R46, described
Capacitance C34 is in parallel with the resistance R46；The output end of the operational amplifier U4B passes through resistance R47 and the control module
First input end be connected, the output end of the operational amplifier U4B also passes sequentially through resistance R47, capacitance C35 ground connection.
Further, the control module includes microprocessor U3, and the first input end of the microprocessor U3 passes through electricity
Resistance R47 is connected with the output end of the operational amplifier U4B, the first output end of the microprocessor U3, second output terminal, the
Three output ends, the 4th output end, the 5th output end and the 6th output end respectively correspondingly with the difference in the driving unit
Input terminal be connected.
Further, the driving unit includes driving chip U5 and periphery electricity corresponding with the driving chip U5
Road, the first input end of the driving chip U5, the second input terminal, third input terminal, the 4th input terminal, the 5th input terminal and
6th input terminal respectively correspondingly with the first output end of the microprocessor U3, second output terminal, third output end, the 4th defeated
Outlet, the 5th output end and the 6th output end are connected；The switch unit includes bridge arm switching tube in W phases, bridge arm is opened in V phases
Bridge arm switching tube in Guan Guan, U phase, W phase lower bridge arms switching tube, V phase lower bridge arms switching tube, U phase lower bridge arms switching tube, resistance R39,
Resistance R29, resistance R30, resistance R22, resistance R41, resistance R40 and resistance R38；Bridge arm switching tube in the W phases, in V phases
The drain electrode of bridge arm switching tube is connected with external power supply on bridge arm switching tube and U phases, bridge arm switching tube in the W phases, in V phases
On bridge arm switching tube and U phases the source electrode of bridge arm switching tube respectively correspondingly with the W phases lower bridge arm switching tube, V phase lower bridge arms
The drain electrode of switching tube and U phase lower bridge arm switching tubes is connected, bridge arm switching tube in the W phases, bridge arm switching tube and U in V phases
The source electrode of bridge arm switching tube is also respectively correspondingly connected with the W phases input terminal of motor, V phases input terminal and U phase input terminals in phase,
The one end of the source electrode of the W phases lower bridge arm switching tube, V phase lower bridge arm switching tubes and U phase lower bridge arm switching tubes with resistance R39
It is connected, the other end ground connection of the resistance R39, one end of the resistance R39 is connected with one end of the resistance R44；The W phases
The grid of upper bridge arm switching tube is connected by resistance R29 with the first output end of the driving chip U5；Bridge arm is opened in the V phases
The grid for closing pipe is connected by resistance R30 with the second output terminal of the driving chip U5；The grid of bridge arm switching tube in the U phases
Pole is connected by resistance R22 with the third output end of the driving chip U5；The grid of the W phases lower bridge arm switching tube passes through electricity
Resistance R41 is connected with the 4th output end of the driving chip U5；The grid of the V phases lower bridge arm switching tube by resistance R40 with
The 5th output end of the driving chip U5 is connected；The grid of the U phases lower bridge arm switching tube passes through resistance R38 and the driving
The 6th output end of chip U5 is connected.
Second aspect, the utility model additionally provide a kind of motor control abating protection device, including motor and above-mentioned
Motor described in first aspect controls fail-safe circuit, and the motor control fail-safe circuit is for controlling the motor
Working condition.
Compared with prior art, the utility model has the following advantages that：This motor controls fail-safe circuit can be quick
It detects short-circuit conditions, to trigger the interruption for the switching circuit for controlling electric machine operation state, prevents control panel or motor into one
Step damage is burnt, and major safety problems are avoided.
Description of the drawings
Fig. 1 is the module map that a kind of motor of the utility model controls fail-safe circuit；
Fig. 2 is the circuit diagram of the current detection module in the utility model；
Fig. 3 is the circuit diagram of the control module in the utility model；
Fig. 4 is the circuit diagram of the switch drive module in the utility model.
Specific implementation mode
In order to allow those skilled in the art to more fully understand the technical solution of the utility model, below in conjunction with the accompanying drawings to this
Utility model is further elaborated.
As shown in Figure 1, a kind of motor control fail-safe circuit 1 is present embodiments provided, including current detection module 10,
Control module 20 and switch drive module 30.
Specifically, the current detection module 10 is used to acquire the current signal in switch drive module 30, with the output phase
The feedback signal answered.Current signal may include normal current signal and short circuit current signal, if current detection module 10 detects
To the short circuit current signal in switch drive module 30, then a feedback signal for feeding back to control module 20 can be generated.
The control module 20 generates corresponding control signal for receiving the feedback signal.Wherein, if electric current is examined
It surveys module 10 and detects short circuit current signal, the feedback signal of output is high level, and control module 20, which receives, indicates short circuit
High level after start external interrupt mechanism, corresponding control signal is exported, to control the disconnection of motor.
The switch drive module 30 includes driving unit 31 and switch unit 32, and the driving unit 31 is for receiving
The control signal is to control the turn-on and turn-off of the switch unit 32, to which control is electrical connected with the switch unit 32
Motor working condition.Wherein after driving unit receives the control signal of feedback generated by high level, control switch is single
The closing of switch in member 32, to shut down the motor being electrical connected with the switch unit.When current detection module 10 detects
When to normal current signal, then control module 20 is sent out control signal can control motor and normally work.
As shown in Fig. 2, as further embodiment, the current detection module 10 may include operational amplifier U4B,
Resistance R44, resistance R45, resistance R46, resistance R47, capacitance C33, capacitance C34 and capacitance C35, one end of the resistance R44
It is connected with the sampled output CSP of the switch unit, the other end of the resistance R44 and the operational amplifier U4B are just
Phase input terminal 5 is connected, and the other end of the resistance R44 is also grounded by capacitance C33；One end of the resistance R45 is straight with first
It flows input terminal to be connected, the other end of the resistance R45 is connected with the negative-phase input 6 of the operational amplifier U4B, the resistance
The other end of R45 is also grounded by resistance R46, and the capacitance C34 is in parallel with the resistance R46；The operational amplifier U4B
Output end 7 be connected with the first input end 21 of the control module by resistance R47, the output of the operational amplifier U4B
End 7 also passes sequentially through resistance R47, capacitance C35 ground connection.Preferably, first direct-flow input end can be the constant of+5v
Direct current inputs.
Wherein, comparator or amplifier can be selected in the operational amplifier U4B.The resistance R44 is transported with capacitance C33 compositions
Discharge signal acquisition input network, the value range of resistance R44 can be with for the value range of 1K Ω~100K Ω, capacitance C33
The input curve of operational amplifier U4B can be changed in size for the μ F of 100PF~0.22, adjustment resistance R44 or capacitance C33.It is described
Resistance R45, resistance R46 and capacitance C34 composition signals input benchmark value network, by adjusting resistance R45 or resistance R46
Value can set different protective current values, and capacitance C34 mainly stablizes relatively a reference value, wherein the value model of resistance R45
Enclosing can be the value range of 10K Ω~200K Ω, resistance R46 can be 100 Ω~10K Ω, the value range of capacitance C34
Can be the μ of 1nF~0.47 F.The resistance R47 and capacitance C35 composition amplifier signals export network, wherein resistance R47's takes
Value may range from 100 Ω~50k Ω, and the value range of capacitance C35 can be the μ F of 100PF~0.1, by adjusting resistance R47
Or amplifier curve of output can be changed in capacitance C35.
As shown in figure 3, as further embodiment, the control module includes microprocessor U3, the microprocessor
The first input end 21 of U3 is connected by resistance R47 with the output end 7 of the operational amplifier U4B, the microprocessor U3's
First output end 13, second output terminal 12, third output end 26, the 4th output end 14, the output of the 5th output end 15 and the 6th
Respectively correspondingly the input terminal different from the driving unit is connected at end 16.Wherein, microprocessor U3 can receive fortune
The feedback signal for calculating amplifier U4B is given to driving unit to control the working condition of motor to send out corresponding control signal.
As shown in figure 4, as further embodiment, the driving unit include driving chip U5 and with the driving
The corresponding peripheral circuits of chip U5, the first input end 1 of the driving chip U5, the second input terminal 2, third input terminal the 3, the 4th
Input terminal 4, the 5th input terminal 5 and the 6th input terminal 6 respectively correspondingly with the first output end 13 of the microprocessor U3,
Two output ends 12, third output end 26, the 4th output end 14, the 5th output end 15 and the 6th output end 16 are connected.
The switch unit includes bridge arm switching tube in bridge arm switching tube Q5, U phase in bridge arm switching tube Q4, V phase in W phases
Q6, W phase lower bridge arm switching tube Q7, V phase lower bridge arm switching tube Q8, U phase lower bridge arm switching tube Q9, resistance R39, resistance R29, resistance
R30, resistance R22, resistance R41, resistance R40 and resistance R38；Bridge arm switching tube in bridge arm switching tube Q4, V phase in the W phases
The drain D of bridge arm switching tube Q6 is connected with external power supply VBAT+ in Q5 and U phases, bridge arm switching tube Q4, V phase in the W phases
In upper bridge arm switching tube Q5 and U phase the source S of bridge arm switching tube Q6 respectively correspondingly with described W phases lower bridge arm switching tube Q7, V
The drain D of phase lower bridge arm switching tube Q8 and U phase lower bridge arm switching tube Q9 is connected, in the W phases in bridge arm switching tube Q4, V phase
The source S of bridge arm switching tube Q6 is also respectively correspondingly inputted with the W phases input terminal of motor, V phases in bridge arm switching tube Q5 and U phase
End and U phase input terminals are connected, W phases lower bridge arm switching tube Q7, V phase lower bridge arm switching tube Q8 and U phase lower bridge arm switch
The source S of pipe Q9 is connected with one end of resistance R39, the other end of resistance R39 ground connection, one end of the resistance R39 with
One end of the resistance R44 is connected；The grid G of bridge arm switching tube Q4 passes through resistance R29 and the driving chip U5 in the W phases
The first output end 13 be connected；The grid G of bridge arm switching tube Q5 passes through the resistance R30's and driving chip U5 in the V phases
Second output terminal 16 is connected；The grid G of bridge arm switching tube Q6 passes through resistance R22 and the driving chip U5 in the U phases the
Three output ends 19 are connected；The grid G of the W phases lower bridge arm switching tube Q7 passes through the 4th of the resistance R41 and driving chip U5
Output end 9 is connected；The 5th output that the grid G of the V phases lower bridge arm switching tube Q8 passes through the resistance R40 and driving chip U5
End 10 is connected；The 6th output end that the grid G of the U phases lower bridge arm switching tube Q9 passes through resistance R38 and the driving chip U5
11 are connected.
The switch drive module can receive the control signal that microcontroller U3 is sent, realize switch unit conducting,
The functions such as closing, to realize the control to electric machine operation state.Preferably, bridge arm switching tube Q4, V phase wherein in W phases
In upper bridge arm switching tube Q5, U phase under bridge arm switching tube Q6, W phases lower bridge arm switching tube Q7, V phase lower bridge arm switching tube Q8 and U phase
Bridge arm switching tube Q9 may each be metal-oxide-semiconductor.
The specific operation principle of the present embodiment can be：
The first situation, when motor starts since static state, microcontroller U3 can first held with three upper bridge arms respectively
The square wave that the first connected output end of pipe, second output terminal and third output end respectively export an about 300uS is closed, it is fully open
Bridge arm switching tube Q6 in bridge arm switching tube Q5, U phase in bridge arm switching tube Q4, V phase in W phases；It then switches to and three lower bridge arms
Switching tube connected the 4th output end, the 5th output end and the 6th output end similarly respectively export the square wave of an about 300uS,
Fully open W phases lower bridge arm switching tube Q7, V phase lower bridge arm switching tube Q8, U phase lower bridge arm switching tube Q9.And when bridge in any one
There are one when short-circuit failure in arm switch pipe or lower bridge arm switching tube, main circuit current is from external power supply VBAT+ successively by leading
The switching tube and sampling resistor R39 of logical switching tube, short-circuit failure are then return to cathode GND, form short-circuit loop.Major loop
The pressure drop that electric current is generated when flowing through the resistance R39 for sampling can be input to the normal phase input end of the operational amplifier U4B
5, and a reference value set with the negative input of operational amplifier U4B 6 is compared, the operation amplifier when it is higher than a reference value
The output end 7 of device U4B is overturn, and exports high level, and after the input terminal 21 of microprocessor U3 detects high level, triggering is interrupted
Then mechanism exports switching tube shutdown control signal and gives driving chip U5, six switching tubes of above-mentioned upper and lower bridge arm are closed simultaneously
It is disconnected, and self-locking and progress switching tube short-circuit failure abnormal alarm are kept away to prevent control panel or motor from further damaging or burn
Exempt from major safety problems.
The second situation, when motor normal operation, when bridge arm switching tube Q5, U phase in bridge arm switching tube Q4, V phase in W phases
When occurring a short-circuit failure in upper bridge arm switching tube Q6, due in motor operation course, under W phase lower bridge arm switching tube Q7, V phases
Always there are one being open in bridge arm switching tube Q8 and U phase lower bridge arm switching tube Q9, then main circuit current is from external power supply
The VBAT+ switching tube by the failure of upper bridgc arm short, lower bridge arm are opened successively switching tube, electrical-coil and sampling resistor R39,
It is then return to cathode GND, forms short-circuit loop, the short-circuit failure protection mechanism of switching tube is as the 1st kind of situation at this time.
In addition, another embodiment as the utility model, also provides a kind of motor control abating protection device, including electricity
Machine and the motor as described in above-described embodiment control fail-safe circuit, and the motor control fail-safe circuit is for controlling
The working condition of the motor.The physical circuit figure of the motor control fail-safe circuit and corresponding operation principle exist
It is described in detail in above-described embodiment, is not repeating herein.
Above-described embodiment is only the wherein specific implementation of the utility model, the description thereof is more specific and detailed, but simultaneously
Cannot the limitation to the utility model patent range therefore be interpreted as.It should be pointed out that for the ordinary skill of this field
For personnel, without departing from the concept of the premise utility, various modifications and improvements can be made, these are apparent
Alternative forms belong to the scope of protection of the utility model.
Claims (5)
1. a kind of motor controls fail-safe circuit, which is characterized in that driven including current detection module, control module and switch
Dynamic model block, wherein
The current detection module is used to acquire the current signal in switch drive module, to export corresponding feedback signal；
The control module generates corresponding control signal for receiving the feedback signal；
The switch drive module includes driving unit and switch unit, and the driving unit is for receiving the control signal
To control the turn-on and turn-off of the switch unit, to the work shape for the motor that control is electrical connected with the switch unit
State.
2. motor as described in claim 1 controls fail-safe circuit, which is characterized in that the current detection module includes fortune
Calculate amplifier U4B, resistance R44, resistance R45, resistance R46, resistance R47, capacitance C33, capacitance C34 and capacitance C35, the electricity
One end of resistance R44 is connected with the sampled output of the switch unit, the other end and the operational amplifier of the resistance R44
The normal phase input end of U4B is connected, and the other end of the resistance R44 is also grounded by capacitance C33；One end of the resistance R45 with
First direct-flow input end is connected, and the other end of the resistance R45 is connected with the negative-phase input of the operational amplifier U4B, institute
The other end for stating resistance R45 is also grounded by resistance R46, and the capacitance C34 is in parallel with the resistance R46；The operation is put
The output end of big device U4B is connected by resistance R47 with the first input end of the control module, the operational amplifier U4B's
Output end also passes sequentially through resistance R47, capacitance C35 ground connection.
3. motor as claimed in claim 2 controls fail-safe circuit, which is characterized in that the control module includes microprocessor
The first input end of device U3, the microprocessor U3 are connected by resistance R47 with the output end of the operational amplifier U4B, institute
State the first output end, second output terminal, third output end, the 4th output end, the 5th output end and the 6th of microprocessor U3
Respectively correspondingly the input terminal different from the driving unit is connected output end.
4. motor as claimed in claim 3 controls fail-safe circuit, which is characterized in that the driving unit includes driving core
Piece U5 and peripheral circuit corresponding with the driving chip U5, the first input end of the driving chip U5, the second input terminal,
Third input terminal, the 4th input terminal, the 5th input terminal and the 6th input terminal respectively correspondingly with the microprocessor U3
One output end, second output terminal, third output end, the 4th output end, the 5th output end and the 6th output end are connected；It is described to open
Close unit include bridge arm switching tube in W phases, bridge arm switching tube in V phases, bridge arm switching tube, W phase lower bridge arms switching tube, V phases in U phases
Lower bridge arm switching tube, U phase lower bridge arms switching tube, resistance R39, resistance R29, resistance R30, resistance R22, resistance R41, resistance R40
And resistance R38；Bridge arm switching tube in the W phases, in V phases in bridge arm switching tube and U phases the drain electrode of bridge arm switching tube with
External power supply is connected, bridge arm switching tube in the W phases, in V phases in bridge arm switching tube and U phases bridge arm switching tube source electrode difference
Accordingly it is connected with the drain electrode of the W phases lower bridge arm switching tube, V phase lower bridge arm switching tubes and U phase lower bridge arm switching tubes, it is described
Bridge arm switching tube in W phases, in V phases in bridge arm switching tube and U phases the source electrode of bridge arm switching tube also respectively correspondingly with the W of motor
Phase input terminal, V phases input terminal and U phase input terminals are connected, the W phases lower bridge arm switching tube, V phase lower bridge arm switching tubes and U
The source electrode of phase lower bridge arm switching tube is connected with one end of resistance R39, the other end ground connection of the resistance R39, the resistance R39
One end be connected with one end of the resistance R44；The grid of bridge arm switching tube passes through resistance R29 and the driving in the W phases
The first output end of chip U5 is connected；The grid of bridge arm switching tube passes through the resistance R30's and driving chip U5 in the V phases
Second output terminal is connected；The grid of bridge arm switching tube is exported by the third of the resistance R22 and driving chip U5 in the U phases
End is connected；The grid of the W phases lower bridge arm switching tube is connected by resistance R41 with the 4th output end of the driving chip U5；
The grid of the V phases lower bridge arm switching tube is connected by resistance R40 with the 5th output end of the driving chip U5；The U phases
The grid of lower bridge arm switching tube is connected by resistance R38 with the 6th output end of the driving chip U5.
5. a kind of motor controls abating protection device, which is characterized in that including motor and such as any one of claims 1 to 4
The motor controls fail-safe circuit, and the motor control fail-safe circuit is used to control the work shape of the motor
State.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820570252.1U CN208094168U (en) | 2018-04-20 | 2018-04-20 | A kind of motor control fail-safe circuit and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820570252.1U CN208094168U (en) | 2018-04-20 | 2018-04-20 | A kind of motor control fail-safe circuit and device |
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| Publication Number | Publication Date |
|---|---|
| CN208094168U true CN208094168U (en) | 2018-11-13 |
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ID=64055664
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| Application Number | Title | Priority Date | Filing Date |
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| CN201820570252.1U Active CN208094168U (en) | 2018-04-20 | 2018-04-20 | A kind of motor control fail-safe circuit and device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113358982A (en) * | 2020-03-03 | 2021-09-07 | 比亚迪股份有限公司 | Motor control system, vehicle and driving unit insulation detection and processing method |
-
2018
- 2018-04-20 CN CN201820570252.1U patent/CN208094168U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113358982A (en) * | 2020-03-03 | 2021-09-07 | 比亚迪股份有限公司 | Motor control system, vehicle and driving unit insulation detection and processing method |
| CN113358982B (en) * | 2020-03-03 | 2024-04-16 | 比亚迪股份有限公司 | Motor control system, vehicle and drive unit insulation detection and processing method |
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