CN207251187U - Protection system for motor - Google Patents
Protection system for motor Download PDFInfo
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- CN207251187U CN207251187U CN201720992645.7U CN201720992645U CN207251187U CN 207251187 U CN207251187 U CN 207251187U CN 201720992645 U CN201720992645 U CN 201720992645U CN 207251187 U CN207251187 U CN 207251187U
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Abstract
A kind of protection system for motor is the utility model is related to, for controlling motor-drive circuit, motor-drive circuit is controlled by processor.Protection system for motor includes supervisory circuit and protection circuit.Supervisory circuit is connected with protection circuit.Protection circuit is also connected with motor-drive circuit, processor respectively.Supervisory circuit is used for the electric current for monitoring motor, and sends over-current signal to protection circuit when electric current is more than overcurrent threshold value.The execution speed of protection circuit is faster than the execution speed of processor.Protection circuit stops control of the processor to motor-drive circuit after over-current signal is received, also, protects circuit to reduce the electric current by controlling motor-drive circuit.When there is overcurrent condition, which to be switched to protection circuit by processor to the control of motor-drive circuit, and protects the execution speed of circuit to be faster than the execution speed of processor, so as to shorten the response time of overcurrent protection.
Description
Technical field
Electric vehicle engineering field is the utility model is related to, more particularly to a kind of protection system for motor.
Background technology
In drive system of electric automobile, the essence of motor control is the control to flowing through current of electric.Because driving cycles,
The factors such as hardware circuit influence, the control of hardware sampling precision, software, all may be excessive there is a situation where flowing through current of electric.
In traditional electric automobile, what the protection for overcurrent was realized typically by software.However, detection of the software to failure and
Response time is longer, and usually more than 100 μ s, and within the time that 100 μ s occur for overcurrent, the electric current of motor can increase about
To 200A, it is sufficient to make already excessive electric current continue to increase and reach a dangerous current range, once in this danger
Power device is controlled in the current range of danger, just very possible damage power device.
Utility model content
Based on this, it is necessary to for traditional electric automobile overcurrent protection response time it is longer the problem of, there is provided a kind of motor
Protection system.
A kind of protection system for motor, for controlling motor-drive circuit, the motor-drive circuit is controlled by processor, institute
Stating protection system for motor includes supervisory circuit and protection circuit；The supervisory circuit is connected with the protection circuit；The protection
Circuit is also connected with the motor-drive circuit, the processor respectively；
The supervisory circuit is used for the electric current for monitoring motor, and when the electric current is more than overcurrent threshold value to the protection electricity
Road sends over-current signal；The execution speed of the protection circuit is faster than the execution speed of the processor；The protection circuit exists
Stop control of the processor to the motor-drive circuit, also, the protection circuit after receiving the over-current signal
Reduce the electric current by controlling the motor-drive circuit.
In one of the embodiments, the protection circuit includes the first trigger and logic control element；Described first
The input terminal of trigger is connected with the output terminal of the supervisory circuit, the output terminal of first trigger respectively with the processing
Device, logic control element connection；
First trigger exports the first level after the over-current signal is received；The processor is described first
Trigger stops controlling the motor-drive circuit when exporting first level；The logic control element is touched described first
Hair device controls the motor-drive circuit to stop driving the motor when exporting first level.
In one of the embodiments, the logic control element includes latch and first and door；The latch
The output terminal that input terminal, described first are all connected with first trigger with the first input end of door；The first of the latch
Output terminal is connected with described first with the second input terminal of door；
The latch is defeated by first after the delay adjustments time when first trigger exports first level
Outlet exports second electrical level；Described first exports the of first level and the latch in first trigger with door
When one output terminal exports the second electrical level, the output phase answers level to control the motor-drive circuit to stop driving the electricity
Machine.
In one of the embodiments, the protection circuit further includes the second trigger and second and door；Described second touches
The output terminal of hair device is connected with described second with the first input end of door；Described second the second input terminal with door and the latch
The second output terminal connection of device；
The first output terminal and the second output terminal of the latch are two complementary output terminals；
Second trigger exports the 3rd level when the rotating speed of the motor is less than the first rotary speed threshold value；Described
Two export the second output terminal output second electricity of the 3rd level and the latch with door in second trigger
Usually, the output phase answers level to control the motor-drive circuit to stop driving the motor.
In one of the embodiments, the motor-drive circuit is three-phase inverter bridge circuit.
In one of the embodiments, the protection circuit further includes the 3rd and door and the 4th and door；Described 3rd and door
Output terminal be connected with the described 4th with the first input end of door；Described 4th with the second input terminal of door, the 3rd input terminal, the
Four input terminals are connected respectively the output terminal of second trigger, the output terminal of first trigger, the latch
The second output terminal；
For second trigger when the rotating speed of the motor is more than the second rotary speed threshold value, output is anti-with the 3rd level
4th level of phase；Described 3rd exports the 5th level with door after the upper bridge of the three-phase inverter bridge circuit breaks down；
Described 4th and door, export the 5th level, second trigger output described the in the described 3rd and door
Four level, first trigger export first level and the second output terminal of the latch exports the second electrical level
When, the output phase answers level to control the lower bridge of the three-phase inverter bridge circuit short-circuit.
In one of the embodiments, the protection circuit further includes the 5th and door and the 6th and door；Described 5th and door
Output terminal be connected with the described 6th with the first input end of door；Described 6th with the second input terminal of door, the 3rd input terminal, the
Four input terminals are connected respectively the output terminal of second trigger, the output terminal of first trigger, the latch
The second output terminal；
For second trigger when the rotating speed of the motor is more than the second rotary speed threshold value, output is anti-with the 3rd level
4th level of phase；Described 5th exports the 6th level with door after the lower bridge of the three-phase inverter bridge circuit breaks down；
Described 6th and door, export the 6th level, second trigger output described the in the described 5th and door
Four level, first trigger export first level and the second output terminal of the latch exports the second electrical level
When, the output phase answers level to control the upper bridge of the three-phase inverter bridge circuit short-circuit.
In one of the embodiments, the protection circuit further includes the 7th and door and the 8th and door；Described 7th and door
Output terminal be connected with the described 8th with the first input end of door；Described 8th the second input terminal, the 3rd input terminal point with door
Output terminal, the second output terminal of the latch of first trigger Dui Ying not connected；
Described 7th exports the 7th with door after the Shang Qiao of the three-phase inverter bridge circuit and lower bridge break down at the same time
Level；Described 8th exports the 7th level, first trigger output, first electricity with door in the described 7th and door
When second output terminal of flat and described latch exports the second electrical level, the output phase answers level to control the three-phase bridge inverse
Each power device for becoming circuit is off state.
In one of the embodiments, the setting time between 2 μ s between 20 μ s.
In above-mentioned protection system for motor, supervisory circuit is used for the electric current for monitoring motor, and when electric current is more than overcurrent threshold value
Over-current signal is sent to protection circuit, protection circuit stops control of the processor to motor-drive circuit after over-current signal is received
System, and reduce the electric current of motor by controlling motor-drive circuit.Therefore, when there is overcurrent condition, the electric motor protecting system
System by processor to the control of motor-drive circuit so that be switched to protection circuit, and protect the execution speed of circuit to be faster than place
The execution speed of device is managed, so as to shorten the response time of overcurrent protection.
Brief description of the drawings
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, drawings in the following description are only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, can also be according to the attached drawing of these attached drawings acquisition other embodiment.
Fig. 1 is the protection system for motor and motor-drive circuit and the block diagram of processor that an embodiment provides；
Fig. 2 is the circuit diagram of the one of which embodiment of the protection circuit of the protection system for motor of Fig. 1 illustrated embodiments；
Fig. 3 is the one of which physical circuit figure for protecting latch in circuit of embodiment illustrated in fig. 2.
Embodiment
For the ease of understanding the utility model, the utility model is more fully retouched below with reference to relevant drawings
State.The preferred embodiment of the utility model is given in attached drawing.But the utility model can come in fact in many different forms
It is existing, however it is not limited to embodiment described herein.On the contrary, the purpose for providing these embodiments is the public affairs made to the utility model
Open the understanding more thorough and comprehensive of content.
Unless otherwise defined, technical field of all of technologies and scientific terms used here by the article with belonging to utility model
The normally understood implication of technical staff it is identical.It is intended merely to retouch in the term used in the description of utility model herein
State the purpose of specific embodiment, it is not intended that limitation the utility model.Term as used herein "and/or" include one or
The arbitrary and all combination of multiple relevant Listed Items.
One embodiment provides a kind of protection system for motor, please refers to Fig.1, for controlling motor-drive circuit 100, and
Motor-drive circuit 100 is controlled by processor 200.Wherein, motor-drive circuit 100 is used for driving motor.Specifically, motor drives
Dynamic circuit 100 is, for example, three-phase inverter bridge circuit.Three-phase inverter bridge circuit includes Shang Qiao and lower bridge, Shang Qiao and lower bridge difference
All include 3 bridge arms, each bridge arm includes a power device.Wherein, power device is, for example, IGBT (Insulated
Gate Bipolar Transistor, insulated gate bipolar transistor) or MOS (insulating gate type field effect tube) pipes.Three-phase bridge
The conductive angle of each bridge arm is 180 ° in inverter circuit, in office to have three bridge arms to simultaneously turn in a flash, such as one above
Bridge arm following two bridge arm simultaneously turns on, or a bridge arm simultaneously turns on below both the above bridge arm.Processor 200, utilizes
Software controls motor-drive circuit 100, processor (i.e. according to the computer data of particular order tissue and the set of instruction)
200 be, for example, microcontroller etc..
In present embodiment, protection system for motor includes supervisory circuit 300 and protection circuit 400.Wherein, supervisory circuit
300 are connected with protection circuit 400.Protection circuit 400 is also connected with motor-drive circuit 100, processor 200 respectively.
Wherein, supervisory circuit 300 is used for the electric current for monitoring motor, and when electric current is more than overcurrent threshold value to protection circuit
400 send over-current signal.Specifically, supervisory circuit 300 monitors the electric current of each phase in motor three-phase alternating current in real time, when monitoring electricity
Road 300 finds have any phase current to be more than overcurrent threshold value (such as 600A), then sends over-current signal to protection circuit 400.Monitoring
Circuit 300 for example including current sampling circuit and comparator, wherein, current sampling circuit gathers the electricity of each phase of motor respectively
Stream, and the current value collected is exported to comparator, comparator believes current value compared with overcurrent threshold value, and by output
Number send to protection circuit 400.
The execution speed of protection circuit 400 is faster than the execution speed of processor 200.Circuit 400 is protected for example by logic gate
Electrical combination is realized, so as to have faster processing speed compared with software.Alternatively, protection circuit 400 can also pass through FPGA
(Field-Programmable Gate Array, field programmable gate array) or CPLD (Complex
Programmable Logic Device, Complex Programmable Logic Devices) realize have equally compared with software faster
Processing speed.
In addition, protection circuit 400 stops control of the processor 200 to motor-drive circuit 100 after over-current signal is received
System, also, protect circuit 400 to reduce the electric current of motor by controlling motor-drive circuit 100.Therefore, occurred in motor
After stream, protection circuit 400 is changed to by processor 200 to the control of motor-drive circuit 100.
Wherein, circuit 400 is protected to stop the specific implementation example of control of the processor 200 to motor-drive circuit 100
Such as it is：Circuit 400 is protected to send the first setting level (such as high level) to processor 200, processor 200, which receives, to be come from
Then stop control motor-drive circuit 100 after protecting the first setting level of circuit 400；Alternatively, processor 200 and motor
Switching device is equipped between drive circuit 100, and the switching device disconnects after the first above-mentioned setting level is received, so that
Control circuit that can be with disconnection process device 200 to motor-drive circuit 100.In addition, protection circuit 400 is by controlling motor to drive
Circuit 100 is, for example, to reduce the implementation of the electric current of motor：Circuit 400 is protected to control motor-drive circuit 100 to stop driving
Dynamic motor, so as to be gradually reduced the electric current of motor.
Therefore, when there is overcurrent condition, above-mentioned protection system for motor cause to the control of motor-drive circuit 100 by
Processor 200 is switched to protection circuit 400, and protects the execution speed of circuit 400 to be faster than the execution speed of processor 200, from
And the response time of overcurrent protection can be shortened, reduce the probability of damage power device.
In one of the embodiments, processor 200 or supervisory circuit 300 are less than safety threshold in the electric current for detecting motor
During value, sent to protection circuit 400 and recover signal.It should be noted that, although after overcurrent generation, processor 200 is not involved in
Control to motor-drive circuit 100, but processor 200 still can monitor the electric current of motor at any time, such as set one
Current sensor detects the electric current of motor in real time, and the current value of detection is fed back to processor 200.In addition, secure threshold
Can be less than above-mentioned overcurrent threshold value (such as：When overcurrent threshold value is 600A, secure threshold 500A), at this moment, secure threshold with
Overcurrent threshold value forms a hysteresis section, so as to be likely to occur when avoiding overcurrent threshold value and the same value of secure threshold
So that protection 400 frequent jumping phenomena of circuit.
Protection circuit 400 recovers control of the processor 200 to motor-drive circuit 100 after receiving recovery signal, and
Circuit 400 is protected to stop control motor-drive circuit 100.Therefore, after the electric current of motor recovers normal, 400 meeting of circuit is protected
The control of motor-drive circuit 100 will be returned to processor 200 again, so as to carry out normal vehicle traction control.Tool
Body, protection circuit 400 sends second of setting level (such as low level) after recovery signal is received to processor 200,
Processor 200 then starts to control motor-drive circuit 100 after receiving second of setting level from processor 200
System.Alternatively, on the premise of being equipped with switching device between processor 200 and motor-drive circuit 100, and the switching device is defeated
Turned on after entering above-mentioned second of setting level, then send the to the switching device after protecting circuit 400 to receive to recover signal
Two kinds of setting level, so as to turn on control circuit of the processor 200 to motor-drive circuit 100.
In one of the embodiments, please refer to Fig.2, protection circuit 400 is made of logic gates.Protect circuit 400
Including the first trigger 410 and logic control element 420.(Fig. 2 does not show the input terminal of first trigger 410 with supervisory circuit 300
Go out) output terminal connection, the output terminal of the first trigger 410 respectively with processor 200 (not shown in Fig. 2), logic control list
Member 420 connects.
First trigger 410 belongs to trigger, is, for example, rest-set flip-flop.First trigger 410 is receiving over-current signal
(such as high level) exports the first level (being, for example, high level) afterwards.Specifically, the S input terminals of the first trigger 410 received
Flow signal.Processor 200 stops the control to motor-drive circuit 100 when the first trigger 410 exports the first level.Logic
Control unit 420 controls motor-drive circuit 100 to stop driving motor when the first trigger 410 exports the first level, such as：
All power devices of control motor-drive circuit 100 are in off-state.
For example, if the first trigger 410 is the rest-set flip-flop that is made of nor gate, and two of the first trigger 410
Input terminal initial default is low level.After supervisory circuit 300 detects that the electric current of motor exceeds overcurrent threshold value, to the first triggering
The over-current signal that device 410 inputs is high level.At this time, the first level of the first trigger 410 output is then high level.Processor
After 200 receive the high level from the first trigger 410, then stop control motor-drive circuit 100.Logic control element
After 420 receive the high level from the first trigger 410, start to control motor-drive circuit 100, and control motor driving electricity
Road 100 stops driving motor, so that the electric current of motor is gradually reduced.
Specifically, latch 421 and first and door 422 are included please continue to refer to Fig. 2, above-mentioned logic control element 420.Lock
The output terminal that the input terminal of storage 421, first are all connected with the first trigger 410 with the first input end (i.e. port B) of door 422.
The first output terminal (i.e. port 1) of latch 421 is connected with first with the second input terminal (i.e. port A) of door 422.
Latch 421 is defeated by the first output terminal after the delay adjustments time when the first trigger 410 exports the first level
Go out second electrical level (such as high level).Specifically, setting time is, for example, 4 μ s between 2 μ s between 20 μ s.Latch 421
One of which specific implementation please refers to Fig.3, including：Resistance R1, capacitance C1, triode Q1 and resistance R2.Wherein, resistance R1
One end be input terminal, the other end of resistance R1 is connected with the base stage of triode Q1.One end connection resistance R1 and three of capacitance C1
The common port of pole pipe Q1, the other end ground connection of capacitance C1.The collector access power supply VCC of triode Q1, the transmitting of triode Q1
Pole is grounded by resistance R2.The common port of triode Q1 and resistance R2 is the output terminal of latch 421.In the latch 421,
By adjusting the value of resistance R1 and capacitance C1, you can so that latch 421 is delayed the corresponding time.For example, it is 40k to set resistance R1
Ω, capacitance C1 are 100pF, then delay time is 4 μ s.
First with door 422 for 2 input and door.First exports the first level and latch with door 422 in the first trigger 410
During 421 the first output terminal output second electrical level, the output phase answers level to control motor-drive circuit 100 to stop driving motor,
Such as：All power devices of control motor-drive circuit 100 are in off-state.
By taking the circuit shown in Fig. 2 as an example, after the S input terminals of the first trigger 410 receive high level, the first trigger
410 output high level.Afterwards, processor 200 stops control motor-drive circuit 100, meanwhile, latch 421 is in delay adjustments
High level is exported by the first output terminal after time.At this time, first and two input terminals of door 422 are high level, then and first
High level is exported with door 422.First controls the specific implementation example of the stopping driving motor of motor-drive circuit 100 with door 422
Such as it is：If each power device of motor-drive circuit 100 is disconnected in input high level, when first with door 422 to each work(
After rate device input high level, you can disconnect each power device of motor-drive circuit 100；If motor-drive circuit 100
Each power device disconnected in input low level, then first each power device is connected by phase inverter with the output terminal of door 422,
When first with door 422 export high level after, by after phase inverter equally can motor-drive circuit 100 each power device
Disconnect.
Further, please continue to refer to Fig. 2, above-mentioned protection circuit 400 further includes the second trigger 430 and second and door
440.The output terminal of second trigger 430 is connected with second with the first input end (B ports) of door 440.Second and the of door 440
Two input terminals (A ports) are connected with the second output terminal (2 port) of latch 421.
Wherein, the first output terminal of latch 421 and the second output terminal are two complementary output terminals.In other words, for
For latch 421, if the first output terminal exports high level, the second output terminal output low level；If the first output terminal exports
Low level, then the second output terminal output high level.
Second trigger 430 belongs to trigger, is, for example, rest-set flip-flop.Also, the second trigger 430 is in the rotating speed of motor
During less than the first rotary speed threshold value, the 3rd level (such as low level) is exported.Wherein, the first rotary speed threshold value is, for example, 2000rpm
(rpm)., can be by the rotating speed of speed probe measurement motor, and by the tachometer value of measurement in wherein a kind of embodiment
Send into comparator, which judges that tachometer value is less than the first rotary speed threshold value, then to the input terminal of the second trigger 430
(such as R input) exports corresponding signal (such as high level).
Second exports the second output terminal output second of the 3rd level and latch 421 with door 440 in the second trigger 430
During level, the output phase answers level to control motor-drive circuit 100 to stop driving motor.Specifically, second and the first of door 440
Input terminal low level is effective, and the second input terminal high level is effective.
Based on above-mentioned protection circuit, and the second trigger 430 still illustrates for rest-set flip-flop by taking Fig. 2 as an example：When motor
When rotating speed is less than the first rotary speed threshold value, the S input terminals of the second trigger 430 are defaulted as low level, and R input have input high electricity
Flat, then the second trigger 430 exports low level.At this time, second and the first input end of door 440 are then low level.Meanwhile if
Second input terminal of latch 421 is high level, then second with the output terminal of door 440 output high level, and then control motor to drive
Dynamic circuit 100 stops driving motor.Second controls the specific implementation side of the stopping driving motor of motor-drive circuit 100 with door 440
Formula may be referred to the description section of above-mentioned first and door 422, just repeat no more here.
When being run due to motor low speed, power device in motor-drive circuit 100 it is all off just can with normal operation,
And if all turning on, larger negative moment can be produced.Therefore, for above-mentioned protection circuit 400, even if motor does not have
There is over-current phenomenon avoidance, but if the rotating speed of motor is relatively low, still control all power devices of motor-drive circuit 100 to open
Road, so as to ensure electric automobile normal operation.
Further, on the premise of motor-drive circuit 100 is three-phase inverter bridge circuit, please continue to refer to Fig. 2, protect
Protection circuit 400 further includes the 3rd and door 450 and the 4th and door 460.3rd with the output terminal of door 450 with the 4th and door 460 the
One input terminal (i.e. D ports) connects.4th with the second input terminal (i.e. C-terminal mouth) of door 460, the 3rd input terminal (i.e. B ports), the
Four input terminals (i.e. A ports) are connected respectively the output terminal of the second trigger 430, the output terminal of the first trigger 410, latch
Second output terminal of device 421.
Wherein, the second trigger 430 is when the rotating speed of motor is more than the second rotary speed threshold value (i.e. high speed operation of motor), output
With the 4th level of the 3rd level inversion (i.e.：3rd level is high level if low level, then the 4th level).Alternatively,
Second rotary speed threshold value is more than the first rotary speed threshold value, and at this moment the first rotary speed threshold value and the second rotary speed threshold value form hysteresis section, can be with
So that the phenomenon that the second trigger 430 is frequently beated when avoiding the first rotary speed threshold value identical with the second rotary speed threshold value.Specifically, such as
The first rotary speed threshold value of fruit is 2000rpm, then the second rotary speed threshold value can be 3000rpm.
3rd with door 450 for 2 input and door.Also, the 3rd there is event with upper bridge of the door 450 in three-phase inverter bridge circuit
The 5th level (such as high level) is exported after barrier.Wherein, upper bridge includes located above three bridge of three-phase inverter bridge circuit
Arm.Specifically, the 3rd low level is defaulted as with two input terminals of door 450, and A input terminal high level is effective, the low electricity of B input terminals
It is flat effective.On how to judge that upper bridge breaks down, such as：Each bridge in upper bridge is detected by current sampling circuit and comparator
Whether the curtage of arm is normal, if it is not, then think that upper bridge breaks down, afterwards, comparator is to the 3rd and the A of door 450
Input terminal input high level, equivalent to informing that the 3rd failure occurs with bridge on door 450, at this time, the 3rd exports high electricity with door 450
It is flat.
4th with door 460 for 4 input and door.Specifically, the 4th is effective with four equal high level of input terminal of door 460.And
And the 4th and door 460, the 5th level is exported with door 450, the second trigger 430 exports the 4th level, the first trigger the 3rd
During the second output terminal output second electrical level of 410 the first level of output and latch 421, the output phase answers level to control three-phase bridge
The lower bridge short circuit of formula inverter circuit.Wherein, lower bridge short circuit is controlled, it is possible to understand that descend each power device of bridge to be in leading in order to control
Logical state, so that the energy of motor is all consumed by lower bridge and motor internal.4th controls motor driving with door 460
The specific implementation of the lower bridge short circuit of circuit 100 is, for example,：If each power device of motor-drive circuit 100 is high in input
Electric conducts, then when the 4th with each power device input high level of 460 downward bridge of door after, you can by motor-drive circuit
100 lower bridge short circuit；If each power device of motor-drive circuit 100 is turned in input low level, the 4th with door 460
Output terminal each power device of lower bridge is connected by phase inverter, after the 4th exports high level with door 460, after phase inverter
It can equally cause the lower bridge short circuit of motor-drive circuit 100.
Therefore, after the failure of upper bridge, motor are in high-speed cruising state and overcurrent occurs in current of electric, the 4th is passed through
Can be short-circuit by lower bridge with door 460, so that the energy of motor is all consumed by lower bridge and motor internal.
Further, please continue to refer to Fig. 2, above-mentioned protection circuit 400 further includes the 5th and door 470 and the 6th and door 480.
5th is connected with the output terminal of door 470 with the 6th with the first input end (i.e. D ports) of door 480.6th is defeated with the second of door 480
Enter to hold (i.e. C-terminal mouth), the 3rd input terminal (i.e. B ports), the 4th input terminal (i.e. A ports) to be connected respectively the second trigger
430 output terminal, the output terminal of the first trigger 410, the second output terminal (i.e. 2 ports) of latch 421.
Second trigger 430 is when the rotating speed of motor is more than the second rotary speed threshold value, output and the 4th of the 3rd level inversion
Level is (i.e.：3rd level is high level if low level, then the 4th level).Alternatively, the second rotary speed threshold value is more than first
Rotary speed threshold value, at this moment the first rotary speed threshold value and the second rotary speed threshold value form hysteresis section, can be to avoid the first rotary speed threshold value and the
Two rotary speed threshold values cause the phenomenon that the second trigger 430 is frequently beated when identical.Specifically, if the first rotary speed threshold value is
2000rpm, then the second rotary speed threshold value can be 3000rpm.
5th exports the 6th level (for example, high electricity with door 470 after the lower bridge of three-phase inverter bridge circuit breaks down
It is flat).Wherein, lower bridge includes be located below three bridge arms of three-phase inverter bridge circuit.Specifically, the the 5th and the two of door 470
A input terminal is defaulted as low level, and A input terminal high level is effective, and B input terminal low levels are effective.On how to judge that lower bridge goes out
Existing failure, such as：It is whether normal that the curtage of each bridge arm in lower bridge is detected by current sampling circuit and comparator, such as
Fruit is no, then it is assumed that lower bridge breaks down, and afterwards, comparator is to the 5th and the A input terminal input high levels of door 470, equivalent to announcement
Know that the 5th failure occurs with 470 times bridges of door, the 5th export high level with door 470 at this time.Specifically, the 5th is defeated with the B of door 470
Enter end to be connected with the above-mentioned 3rd with the A input terminals of door 450.5th is defeated with the B of door 450 with the A input terminals of door 470 and the above-mentioned 3rd
Enter end connection.
6th with door 480, for 4 input and door.Specifically, the 6th is effective with four equal high level of input terminal of door 480.And
And the 6th and door 480, the 6th level is exported with door 470, the second trigger 430 exports the 4th level, the first trigger the 5th
During the second output terminal output second electrical level of 410 the first level of output and latch 421, the output phase answers level to control three-phase bridge
The upper bridge short circuit of formula inverter circuit.Wherein, bridge short circuit in control, it is possible to understand that each power device of upper bridge is in leading in order to control
Logical state, so that the energy of motor is all consumed by upper bridge and motor internal.6th controls motor driving with door 480
The specific implementation of the upper bridge short circuit of circuit 100 is, for example,：If each power device of motor-drive circuit 100 is high in input
Electric conducts, then when the 6th with each power device input high level of 480 upward bridge of door after, you can by motor-drive circuit
100 upper bridge short circuit；If each power device of motor-drive circuit 100 is turned in input low level, the 6th with door 480
Output terminal each power device of upper bridge is connected by phase inverter, after the 6th exports high level with door 480, after phase inverter
It can equally cause the upper bridge short circuit of motor-drive circuit 100.
Therefore, after the failure of lower bridge, motor are in high-speed cruising state and overcurrent occurs in motor, the 6th and door are passed through
480 can be short-circuit by upper bridge, so that the energy of motor is all consumed by upper bridge and motor internal.
Further, the 7th and door 491 and the 8th and door 492 are further included please continue to refer to Fig. 2, protection circuit 400.7th
It is connected with the output terminal of door 491 with the 8th with the first input end (i.e. C-terminal mouth) of door 492.8th with the second input terminal of door 492
(i.e. B ports), the 3rd input terminal (i.e. A ports) are connected respectively the output terminal of the first trigger 410, the of latch 421
Two output terminals.
7th exports the 7th level with door 491 after the Shang Qiao of three-phase inverter bridge circuit and lower bridge break down at the same time
(such as high level).Specifically, the 7th low level is defaulted as with two input terminals of door 491, and high level is effective.On such as
What judges that Shang Qiao and lower bridge break down at the same time, such as is detected by current sampling circuit and comparator in Shang Qiao and lower bridge respectively
Whether the curtage of bridge arm is normal, if Shang Qiao and lower bridge all break down, comparator is to the 7th and the A of door 491 at this time
Input terminal, B input terminals input high level at the same time, equivalent to informing that the 7th failure occurs at the same time with 491 Shang Qiao of door and lower bridge, this
When, the 7th exports high level with door 491.Specifically, the 7th A input terminals with door 491 and the above-mentioned 3rd and the A inputs of door 450
End connection.7th is connected with the B input terminals of door 491 with the above-mentioned 5th with the A input terminals of door 470.
8th with door 492, for 3 input and door.Specifically, the 8th is effective with three equal high level of input terminal of door 492.The
Eight with door 492, export the 7th level with door 491 the 7th, the first trigger 410 exports the of the first level and latch 421
When two output terminals export second electrical level, the output phase answers level to control each power device of three-phase inverter bridge circuit to be off
State.8th controls each power device of three-phase inverter bridge circuit to be off the specific implementation example of state with door 492
Such as it is：If each power device of motor-drive circuit 100 is disconnected in input high level, when the 8th with door 492 to each work(
After rate device input high level, you can disconnect each power device of motor-drive circuit 100；If motor-drive circuit 100
Each power device disconnected in input low level, then the 8th each power device is connected by phase inverter with the output terminal of door 492,
When the 8th with door 492 export high level after, by after phase inverter equally can motor-drive circuit 100 each power device
Disconnect.
Therefore, break down at the same time in Shang Qiao and lower bridge, and when overcurrent occurs in motor, can be with door 480 by the 6th
In time by 100 switched on line state of motor-drive circuit.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, the scope that this specification is recorded all is considered to be.
Embodiment described above only expresses the several embodiments of the utility model, its description is more specific and detailed,
But therefore it can not be interpreted as the limitation to utility model patent scope.It should be pointed out that the common skill for this area
For art personnel, without departing from the concept of the premise utility, various modifications and improvements can be made, these are belonged to
The scope of protection of the utility model.Therefore, the protection domain of the utility model patent should be determined by the appended claims.
Claims (9)
1. a kind of protection system for motor, for controlling motor-drive circuit, the motor-drive circuit is controlled by processor, it is special
Sign is that the protection system for motor includes supervisory circuit and protection circuit；The supervisory circuit is connected with the protection circuit；
The protection circuit is also connected with the motor-drive circuit, the processor respectively；
The supervisory circuit is used for the electric current for monitoring motor, and when the electric current is more than overcurrent threshold value to the protection circuit hair
Send over-current signal；The execution speed of the protection circuit is faster than the execution speed of the processor；The protection circuit is receiving
Stop control of the processor to the motor-drive circuit after to the over-current signal, also, the protection circuit passes through
The motor-drive circuit is controlled to reduce the electric current.
2. protection system for motor according to claim 1, it is characterised in that it is described protection circuit include the first trigger and
Logic control element；The input terminal of first trigger is connected with the output terminal of the supervisory circuit, first trigger
Output terminal be connected respectively with the processor, the logic control element；
First trigger exports the first level after the over-current signal is received；The processor is in the described first triggering
Device stops controlling the motor-drive circuit when exporting first level；The logic control element is in first trigger
The motor-drive circuit is controlled to stop driving the motor when exporting first level.
3. protection system for motor according to claim 2, it is characterised in that the logic control element include latch and
First and door；The input terminal of the latch, described first are all connected with the defeated of first trigger with the first input end of door
Outlet；First output terminal of the latch is connected with described first with the second input terminal of door；
The latch passes through the first output terminal when first trigger exports first level after the delay adjustments time
Export second electrical level；Described first with door first trigger export first level and the latch it is first defeated
When outlet exports the second electrical level, the output phase answers level to control the motor-drive circuit to stop driving the motor.
4. protection system for motor according to claim 3, it is characterised in that the protection circuit further includes the second trigger
And second and door；The output terminal of second trigger is connected with described second with the first input end of door；Described second and door
The second input terminal be connected with the second output terminal of the latch；
The first output terminal and the second output terminal of the latch are two complementary output terminals；
Second trigger exports the 3rd level when the rotating speed of the motor is less than the first rotary speed threshold value；Described second with
Door when the second output terminal that second trigger exports the 3rd level and the latch exports the second electrical level,
The output phase answers level to control the motor-drive circuit to stop driving the motor.
5. protection system for motor according to claim 4, it is characterised in that the motor-drive circuit is inverse for three-phase bridge
Become circuit.
6. protection system for motor according to claim 5, it is characterised in that it is described protection circuit further include the 3rd with door and
4th and door；Described 3rd is connected with the output terminal of door with the described 4th with the first input end of door；Described 4th and the of door
Two input terminals, the 3rd input terminal, the 4th input terminal are connected respectively the output terminal of second trigger, first triggering
Second output terminal of the output terminal of device, the latch；
Second trigger is when the rotating speed of the motor is more than the second rotary speed threshold value, output and the 3rd level inversion
4th level；Described 3rd exports the 5th level with door after the upper bridge of the three-phase inverter bridge circuit breaks down；
Described 4th and door, export the 5th level, second trigger output the 4th electricity in the described 3rd and door
When second output terminal of flat, described first trigger output first level and the latch exports the second electrical level,
The output phase answers level to control the lower bridge of the three-phase inverter bridge circuit short-circuit.
7. protection system for motor according to claim 5, it is characterised in that it is described protection circuit further include the 5th with door and
6th and door；Described 5th is connected with the output terminal of door with the described 6th with the first input end of door；Described 6th and the of door
Two input terminals, the 3rd input terminal, the 4th input terminal are connected respectively the output terminal of second trigger, first triggering
Second output terminal of the output terminal of device, the latch；
Second trigger is when the rotating speed of the motor is more than the second rotary speed threshold value, output and the 3rd level inversion
4th level；Described 5th exports the 6th level with door after the lower bridge of the three-phase inverter bridge circuit breaks down；
Described 6th and door, export the 6th level, second trigger output the 4th electricity in the described 5th and door
When second output terminal of flat, described first trigger output first level and the latch exports the second electrical level,
The output phase answers level to control the upper bridge of the three-phase inverter bridge circuit short-circuit.
8. protection system for motor according to claim 5, it is characterised in that it is described protection circuit further include the 7th with door and
8th and door；Described 7th is connected with the output terminal of door with the described 8th with the first input end of door；Described 8th and the of door
Two input terminals, the 3rd input terminal are connected respectively the second output terminal of the output terminal of first trigger, the latch；
Described 7th exports the 7th level with door after the Shang Qiao of the three-phase inverter bridge circuit and lower bridge break down at the same time；
Described 8th exports the 7th level the described 7th with door with door, first trigger exports first level and institute
When stating the second output terminal output second electrical level of latch, the output phase answers level to control the three-phase inverter bridge circuit
Each power device be off state.
9. according to the protection system for motor described in any one of claim 3 to 8 claim, it is characterised in that the setting
Time is between 2 μ s between 20 μ s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720992645.7U CN207251187U (en) | 2017-08-09 | 2017-08-09 | Protection system for motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720992645.7U CN207251187U (en) | 2017-08-09 | 2017-08-09 | Protection system for motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207251187U true CN207251187U (en) | 2018-04-17 |
Family
ID=61879807
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720992645.7U Withdrawn - After Issue CN207251187U (en) | 2017-08-09 | 2017-08-09 | Protection system for motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207251187U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107492867A (en) * | 2017-08-09 | 2017-12-19 | 深圳腾势新能源汽车有限公司 | Protection system for motor |
| CN109038498A (en) * | 2018-08-29 | 2018-12-18 | 深圳腾势新能源汽车有限公司 | Protection system for motor |
| CN111106788A (en) * | 2018-10-26 | 2020-05-05 | 上海汽车集团股份有限公司 | Active short-circuit protection system of motor |
-
2017
- 2017-08-09 CN CN201720992645.7U patent/CN207251187U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107492867A (en) * | 2017-08-09 | 2017-12-19 | 深圳腾势新能源汽车有限公司 | Protection system for motor |
| CN107492867B (en) * | 2017-08-09 | 2019-12-06 | 深圳腾势新能源汽车有限公司 | Motor protection system |
| CN109038498A (en) * | 2018-08-29 | 2018-12-18 | 深圳腾势新能源汽车有限公司 | Protection system for motor |
| CN111106788A (en) * | 2018-10-26 | 2020-05-05 | 上海汽车集团股份有限公司 | Active short-circuit protection system of motor |
| CN111106788B (en) * | 2018-10-26 | 2022-02-25 | 上海汽车集团股份有限公司 | Active short-circuit protection system of motor |
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