CN109038498A - Protection system for motor - Google Patents

Protection system for motor Download PDF

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Publication number
CN109038498A
CN109038498A CN201810994914.2A CN201810994914A CN109038498A CN 109038498 A CN109038498 A CN 109038498A CN 201810994914 A CN201810994914 A CN 201810994914A CN 109038498 A CN109038498 A CN 109038498A
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CN
China
Prior art keywords
motor
door
circuit
level
output
Prior art date
Application number
CN201810994914.2A
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Chinese (zh)
Inventor
胡凯
张明
埃里克·哈特曼
Original Assignee
深圳腾势新能源汽车有限公司
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Application filed by 深圳腾势新能源汽车有限公司 filed Critical 深圳腾势新能源汽车有限公司
Priority to CN201810994914.2A priority Critical patent/CN109038498A/en
Publication of CN109038498A publication Critical patent/CN109038498A/en

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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/085Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load

Abstract

The embodiment of the invention discloses a kind of protection system for motor, for realizing the control to motor-drive circuit by hardware circuit, so as to shorten the response time of overcurrent protection.Protection system for motor in the present invention includes: monitoring circuit, protection circuit, motor-drive circuit and processor;The monitoring circuit and the protection circuit connection;The protection circuit is connect with the motor-drive circuit and the processor respectively;The processor is also connect with the motor-drive circuit;The monitoring circuit is used to monitor the electric current of motor; and over-current signal is sent to the protection circuit when the electric current is greater than overcurrent threshold value; so that the protection circuit stops control of the processor to the motor-drive circuit, and the protection circuit reduces the electric current by controlling the motor-drive circuit;First execution speed of motor-drive circuit described in the protection circuit control is greater than the second execution speed that the processor controls the motor-drive circuit.

Description

Protection system for motor

Technical field

The present invention relates to electric vehicle engineering field more particularly to a kind of protection system for motor.

Background technique

In drive system of electric automobile, the essence of motor control is the control to current of electric is flowed through.Because driving cycles, The factors such as hardware circuit influence, hardware sampling precision, software control, all may be excessively high there is a situation where flowing through current of electric.? In traditional electric car, the protection for overcurrent is usually by software realization.However, software to the detection of 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 be increased about To 200A, it is sufficient to it continues growing already excessively high electric current and reaches a dangerous current range, once in this danger Power device is controlled in the current range of danger, just very possible damage power device.

Summary of the invention

The embodiment of the invention provides a kind of protection system for motor, for being realized by hardware circuit to motor-drive circuit Control, so as to shorten the response time of overcurrent protection.

The embodiment of the present application provides a kind of protection system for motor, for controlling motor-drive circuit, the electric motor protecting system System includes:

Monitor circuit, protection circuit and processor;

The monitoring circuit and the protection circuit connection;

The protection circuit is connect with the motor-drive circuit and the processor respectively;

The processor is also connect with the motor-drive circuit;

The monitoring circuit is used to monitor the electric current of motor, and when the electric current is greater than overcurrent threshold value to the protection electricity Road sends over-current signal, so that the protection circuit stops control of the processor to the motor-drive circuit, and described Protection circuit reduces the electric current by controlling the motor-drive circuit;

First of motor-drive circuit described in the protection circuit control executes speed and is greater than described in processor control The second of motor-drive circuit executes speed.

Preferably, the monitoring circuit is sent when monitoring that the electric current is less than secure threshold to the protection circuit Restore signal;

The protection circuit restores control of the processor to the motor-drive circuit after receiving the recovery signal System, also, the protection circuit stops the control to the motor-drive circuit.

Preferably, the protection circuit includes the first trigger and logic control element;The input of first trigger End with it is described monitor circuit output end connect, the output end of first trigger respectively with the logic control element and institute State processor connection;

First trigger exports the first level when receiving the over-current signal;

The processor stops controlling the electricity when receiving first level exported by first trigger Drive circuit;

The logic control element is when receiving first level exported by first trigger, described in control Motor-drive circuit stops driving the motor.

Preferably, the logic control element includes latch and first and door;

The input terminal of the latch and described first the defeated of first trigger is all connected with the first input end of door Outlet;First output end of the latch is connect with described first with the second input terminal of door;

The latch is defeated by first after the setting time that is delayed when first trigger exports first level Outlet exports second electrical level;Described first and door in first trigger export the of first level and the latch When one output end exports the second electrical level, output phase answers level to control the motor-drive circuit and stop driving the electricity Machine.

Preferably, the protection circuit further includes the second trigger and second and door;

The output end of second trigger is connect with described second with the first input end of door, and described second and the of door Two input terminals are connect with the second output terminal of the latch;

First output end of the latch is two complementary output ends with second output terminal;

Second trigger exports third level when the revolving speed of the motor is less than the first rotary speed threshold value;Described Two and door second output terminal output second electricity that exports the third level and the latch in second trigger Usually, output phase answers level to control the motor-drive circuit and stop driving the motor.

Preferably, the motor-drive circuit is three-phase inverter bridge circuit.

Preferably, the protection circuit further includes third and door and the 4th and door;

The output end of the third and door is connect with the described 4th with the first input end of door;

Described 4th is connected respectively second touching with the second input terminal, third input terminal, the 4th input terminal of door Send out output end, the output end of first trigger and the second output terminal of the latch of device;

Second trigger exports anti-with the third level when the revolving speed of the motor is greater than the second rotary speed threshold value 4th level of phase;

The third and door export the 5th level after the upper bridge of the three-phase inverter bridge circuit breaks down;

Described 4th and door, the 5th level, second trigger output described the is exported in the third and door Four level, first trigger export first level and the second output terminal of the latch exports the second electrical level When, output phase answers level to control the short circuit of the lower bridge of the three-phase inverter bridge circuit.

Preferably, the protection circuit further includes the 5th and door and the 6th and door;

Described 5th connect with the output end of door with the described 6th with the first input end of door;

Described 6th is connected respectively second touching with the second input terminal, third input terminal, the 4th input terminal of door Send out the second output terminal of the output end of device, the output end of first trigger, the latch;

Second trigger exports anti-with the third level when the revolving speed of the motor is greater than the second rotary speed threshold value 4th level of phase;

Described 5th and door the three-phase inverter bridge circuit lower bridge break down after export the 6th level;

Described 6th and door, the 6th level, second trigger output described the is exported with door the described 5th Four level, first trigger export first level and the second output terminal of the latch exports the second electrical level When, output phase answers level to control the short circuit of the upper bridge of the three-phase inverter bridge circuit.

Preferably, the protection circuit further includes the 7th and door and the 8th and door;

Described 7th connect with the output end of door with the described 8th with the first input end of door;

Described 8th is connected respectively the output of first trigger with the second input terminal, the third input terminal of door It holds, the second output terminal of the latch;

Described 7th and door the 7th is exported after the Shang Qiao of the three-phase inverter bridge circuit and lower bridge break down simultaneously Level;

Described 8th and door the described 7th export the 7th level, first trigger output described first with door When the second output terminal of level and the latch exports the second electrical level, output phase answers level to control the three-phase bridge Each power device of inverter circuit is in an off state.

Preferably, the setting time is 2us between 20us.

As can be seen from the above technical solutions, the embodiment of the present invention has the advantage that

In the embodiment of the present application, protection system for motor includes: monitoring circuit, protection circuit, motor-drive circuit and processing Device, wherein monitoring circuit and protection circuit connection, protection circuit are connect with motor-drive circuit and processor, processor and electricity Drive circuit connection, monitoring circuit are used to monitor the electric current of motor, and when electric current is greater than overcurrent threshold value to protection circuit hair Over-current signal is sent, protection circuit stops control of the processor to motor-drive circuit after receiving over-current signal, and passes through control Motor-drive circuit processed reduces the electric current of motor, and protects first of motor-drive circuit described in circuit control to execute speed big Control the motor-drive circuit in the processor second executes speed.Therefore, when there is overcurrent condition, which is protected Protecting system to be switched to protection circuit by processor to the control of motor-drive circuit, so as to shorten overcurrent protection Response time.

Detailed description of the invention

Fig. 1 is the connection block diagram of protection system for motor in the embodiment of the present application;

Fig. 2 is one embodiment schematic diagram that circuit is protected in the embodiment of the present application;

Fig. 3 is a kind of physical circuit schematic diagram of latch in the embodiment of the present application;

Fig. 4 is detailed circuit schematic of the protection circuit in vehicle power-driven system in the embodiment of the present application.

Specific embodiment

The embodiment of the invention provides a kind of protection system for motor, for being realized by hardware circuit to motor-drive circuit Control, so as to shorten the response time of overcurrent protection.

In order to enable those skilled in the art to better understand the solution of the present invention, below in conjunction in the embodiment of the present invention Attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only The embodiment of a part of the invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people The model that the present invention protects all should belong in member's every other embodiment obtained without making creative work It encloses.

For convenience of understanding, below to the protection system for motor in the application, it is illustrated:

In practical application scene, electrical principle explanation of the electric machine control system in entire dynamical system please refers to figure 4, electric energy is provided for dynamical system by power battery first, and during the driving of dynamical system, HW current detection circuit is real When acquire the three-phase current of motor M, under normal non-overcurrent condition, by processor control motor-drive circuit to IGBT (Insulated Gate BipolarTransistor, insulated gate bipolar transistor) module is driven;There is overcurrent When situation, turn to control motor by CPLD (Complex Programmable Logic Device, Complex Programmable Logic Devices) Driving circuit drives IGBT (Insulated Gate BipolarTransistor, insulated gate bipolar transistor) module It is dynamic.

Specifically, in the embodiment of the present application protection system for motor system block diagram, referring to Fig. 1, the protection system for motor It include: monitoring circuit 300, protection circuit 400, motor-drive circuit 100 and processor 200, wherein monitoring circuit 300 and guarantor Protection circuit 400 connect, protection circuit 400 connect respectively with motor-drive circuit 100 and processor 200, processor 200 also with electricity Drive circuit 100 connects, and under normal non-overcurrent condition, motor-drive circuit 100 is controlled by processor 200, motor driven Circuit 100 is used to driving motor.Specifically, motor-drive circuit 100 can be three-phase inverter bridge circuit.Three-phase bridge type inverse Circuit includes Shang Qiao and lower bridge, and Shang Qiao and lower bridge all include 3 bridge arms respectively, each bridge arm includes a power device.Its In, power device can for IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) or MOS (insulating gate type field effect tube) pipe.The conductive angle of each bridge arm is 180 ° in three-phase inverter bridge circuit, a flash in office Between, simultaneously turn on there are three bridge arm, such as above a bridge arm following two bridge arm simultaneously turn on or both the above bridge arm under One, face bridge arm simultaneously turns on.Processor 200, using software (i.e. according to the computer data of particular order tissue and instruction Set) control motor-drive circuit 100, processor 200 can be single-chip microcontroller etc..

Wherein, monitoring circuit 300 is used to monitor the electric current of motor, and when electric current is greater than overcurrent threshold value to protection circuit 400 send over-current signal.Specifically, monitoring circuit 300 monitors the electric current of each phase in motor three-phase alternating current in real time, when monitoring electricity When the discovery of road 300 has any phase current to be greater than overcurrent threshold value (such as 600A), then over-current signal is sent to protection circuit 400.Tool Body, monitoring circuit 300 may include current sampling circuit and comparator, wherein it is every that current sampling circuit acquires motor respectively The electric current of one phase, and collected current value is exported to comparator, current value is compared by comparator with overcurrent threshold value, and Output signal is sent to protection circuit 400.

The execution speed of protection circuit 400 is faster than the execution speed of processor 200, and protection circuit 400 can be by logic gate Electrical combination is realized, to have faster processing speed compared with software.Alternatively, protection circuit 400 can also pass through FPGA (Field-Programmable GateArray, field programmable gate array) or CPLD (Complex Programmable Logic Device, Complex Programmable Logic Devices) realize that there is faster processing speed equally compared with software.

In addition, protection circuit 400 stops control of the processor 200 to motor-drive circuit 100 after receiving over-current signal System, also, protect circuit 400 to pass through control motor-drive circuit 100 to reduce the electric current of motor.Therefore, occurred in motor After stream, protection circuit 400 is changed to by processor 200 to the control of motor-drive circuit 100.

Wherein, protection circuit 400 stops processor 200 to the specific implementation example of the control of motor-drive circuit 100 Such as are as follows: protection circuit 400 sends the first setting level (such as high level) to processor 200, and processor 200, which receives, to be come from Then stop controlling motor-drive circuit 100 after protecting the first setting level of circuit 400;Alternatively, processor 200 and motor Switching device is equipped between driving circuit 100, and the switching device disconnects after receiving the first above-mentioned setting level, thus It can be with disconnection process device 200 to the control circuit of motor-drive circuit 100.In addition, protection circuit 400 passes through control motor driven Circuit 100 come reduce the implementation of the electric current of motor can be with are as follows: protection circuit 400, which controls motor-drive circuit 100, to be stopped driving Dynamic motor, to be gradually reduced the electric current of motor.

Therefore, when there is overcurrent condition, above-mentioned protection system for motor make to the control of motor-drive circuit 100 by Processor 200 is switched to protection circuit 400, and the execution speed of protection circuit 400 is 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.

As an alternative embodiment, processor 200 or monitoring circuit 300 are less than peace in the electric current for monitoring motor When full threshold value, it can also be sent to protection circuit 400 and restore signal.It should be noted that, although after overcurrent generation, processor 200 are not involved in the control to motor-drive circuit 100, but processor 200 still can monitor the electric current of motor at any time, such as The current value that one current sensor carrys out the electric current of real-time detection motor, and will test is set and feeds back to processor 200.In addition, Secure threshold can be less than above-mentioned overcurrent threshold value (such as: when overcurrent threshold value be 600A when, secure threshold 500A), at this moment, peace Full threshold value and overcurrent threshold value constitute a hysteresis section, so as to can when to avoid overcurrent threshold value and secure threshold be the same value What can be occurred makes the protection frequent jumping phenomena of circuit 400.

Protection circuit 400 restores 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 restores normal, 400 meeting of circuit is protected Control to motor-drive circuit 100 is returned again to processor 200, to carry out normal vehicle traction control.Tool Body, protection circuit 400 sends second of setting level (such as low level) to processor 200 after receiving recovery signal, Processor 200 then starts to control motor-drive circuit 100 after receiving second of setting level from processor 200 System.Alternatively, under the premise of being equipped with switching device between processor 200 and motor-drive circuit 100, and the switching device is defeated It is connected after entering above-mentioned second of setting level, then sends the to the switching device after protecting circuit 400 to receive to restore signal Two kinds of setting level, so as to which processor 200 is connected to the control circuit of motor-drive circuit 100.

As an alternative embodiment, referring to FIG. 2, protection circuit 400 is made of logic gates.Protect circuit 400 include the first trigger 410 and logic control element 420.The input terminal and monitoring 300 (Fig. 2 of circuit of first trigger 410 Be not shown) output end connection, the output end of the first trigger 410 respectively with processor 200 (being not shown in Fig. 2), logic control Unit 420 processed connects.

First trigger 410 belongs to trigger, for example, rest-set flip-flop.First trigger 410 is receiving over-current signal (such as high level) exports the first level (for example, high level) afterwards.Specifically, the S input terminal 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 The control motor-drive circuit 100 when the first trigger 410 exports the first level of control unit 420 stops driving motor, such as: All power devices of control motor-drive circuit 100 are in off-state.

Specifically, if the first trigger 410 is the rest-set flip-flop being made of nor gate, and two of the first trigger 410 Input terminal initial default is low level.After monitoring circuit 300 monitors the electric current of motor beyond overcurrent threshold value, to the first triggering The over-current signal that device 410 inputs is high level.At this point, 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 controlling 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 controls motor driven electricity Road 100 stops driving motor, so that the electric current of motor is gradually reduced.

Specifically, with continued reference to FIG. 2, above-mentioned logic control element 420 include latch 421 and first with door 422.Lock The output end 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 end (i.e. port 1) of latch 421 is connect with first with the second input terminal (i.e. port A) of door 422.

Latch 421 is defeated by the first output end after the setting time that is delayed when the first trigger 410 exports the first level Second electrical level (such as high level) out.Specifically, setting time between 2 μ s between 20 μ s, for example, 4 μ s.Latch 421 One of specific implementation is referring to FIG. 3, include: resistance R1, capacitor C1, triode Q1 and resistance R2.Wherein, resistance R1 One end be input terminal, the other end of resistance R1 connect with the base stage of triode Q1.One end of capacitor C1 connects resistance R1 and three The common end of pole pipe Q1, the other end ground connection of capacitor C1.The collector of triode Q1 accesses power supply VCC, the transmitting of triode Q1 Pole is grounded by resistance R2.The common end of triode Q1 and resistance R2 is the output end of latch 421.In the latch 421, By adjusting the value of resistance R1 and capacitor C1, that is, latch 421 may make to be delayed the corresponding time.For example, setting resistance R1 is 40k Ω, capacitor C1 are 100pF, then delay time is 4 μ s.

First with door 422 be 2 input and door.First exports the first level and latch in the first trigger 410 with door 422 When 421 the first output end exports second electrical level, output phase answers level to control motor-drive circuit 100 and stop driving motor, Such as: all power devices of control motor-drive circuit 100 are in off-state.

By taking circuit shown in Fig. 2 as an example, after the S input terminal of the first trigger 410 receives high level, the first trigger 410 output high level.Later, processor 200 stops control motor-drive circuit 100, meanwhile, latch 421 is set in delay High level is exported by the first output end after time.At this point, first and two input terminals of door 422 are high level, then first High level is exported with door 422.First specific implementation for controlling the stopping driving motor of motor-drive circuit 100 with door 422 can With are as follows: if each power device of motor-drive circuit 100 is disconnected in input high level, when first with door 422 to each function After rate device input high level, each power device of motor-drive circuit 100 can be disconnected;If motor-drive circuit 100 Each power device disconnected in input low level, then first each power device is connect by phase inverter with the output end of door 422, After first exports high level with door 422, by each power device that can equally make motor-drive circuit 100 after phase inverter It disconnects.

Further, with continued reference to FIG. 2, above-mentioned protection circuit 400 further includes the second trigger 430 and second and door 440.The output end of second trigger 430 is connect with second with the first input end (port B) of door 440.Second and the of door 440 Two input terminals (port A) are connect with the second output terminal (2 port) of latch 421.

Wherein, the first output end of latch 421 is two complementary output ends with second output terminal.In other words, for For latch 421, if the first output end exports high level, second output terminal exports low level;If the first output end exports Low level, then second output terminal exports high level.

Second trigger 430 belongs to trigger, can be rest-set flip-flop.Also, the second trigger 430 is in the revolving speed of motor When less than the first rotary speed threshold value, export third level (such as low level).Wherein, the first rotary speed threshold value is, for example, 2000rpm (rpm).In a kind of wherein optional embodiment, the revolving speed of motor can be measured by speed probe, and by measurement Tachometer value is sent in comparator, which judges tachometer value less than the first rotary speed threshold value, then to the defeated of the second trigger 430 Enter end (such as R input) and exports corresponding signal (such as high level).

Second exports the second output terminal output second of third level and latch 421 with door 440 in the second trigger 430 When level, output phase answers level to control motor-drive circuit 100 and 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 is that rest-set flip-flop still illustrates by taking Fig. 2 as an example: when motor When revolving speed is less than the first rotary speed threshold value, the S input terminal of the second trigger 430 is defaulted as low level, and R input has input high electricity Flat, then the second trigger 430 exports low level.At this point, second and the first input end of door 440 are then low level.Meanwhile if Second input terminal of latch 421 is that the output end of high level, then second and door 440 exports high level, and then controls motor and drive Dynamic circuit 100 stops driving motor.Second controls the specific implementation side that motor-drive circuit 100 stops driving motor with door 440 Formula can just repeat no more here with reference to above-mentioned first and the description section of door 422.

When due to the operation of motor low speed, power device in motor-drive circuit 100 is all off can just to be operated normally, And if all turning on, biggish negative moment can be generated.Therefore, for above-mentioned protection circuit 400, even if motor does not have There is over-current phenomenon avoidance, but if the revolving speed of motor is lower, all power devices of still control motor-drive circuit 100 are opened Road, to guarantee that electric car operates normally.

Further, under the premise of motor-drive circuit 100 is three-phase inverter bridge circuit, with continued reference to FIG. 2, protecting Protection circuit 400 further include third and door 450 and the 4th with door 460.The output end of third and door 450 with the 4th and door 460 the One input terminal (i.e. the port D) connection.4th with the second input terminal (i.e. C port) of door 460, third input terminal (i.e. the port B), the Four input terminals (i.e. the port A) are connected respectively the output end of the second trigger 430, the output end of the first trigger 410, latch The second output terminal of device 421.

Wherein, the second trigger 430 is when the revolving speed of motor is greater than the second rotary speed threshold value (i.e. high speed operation of motor), output With the 4th level (that is: for third level if it is low level, the 4th level is high level) of third level inversion.Optionally, Second rotary speed threshold value is greater than the first rotary speed threshold value, and at this moment the first rotary speed threshold value and the second rotary speed threshold value constitute hysteresis section, can be with Avoid the phenomenon that making the second trigger 430 frequently beat when the first rotary speed threshold value is 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.

Third and door 450 are 2 inputs and door.Also, there is event in the upper bridge of three-phase inverter bridge circuit in third and door 450 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, two input terminals of third and door 450 are defaulted as low level, and A input terminal high level is effective, the low electricity of B input terminal It is flat effective.On how to judging that upper bridge breaks down, such as: each bridge in upper bridge is detected by current sampling circuit and comparator Whether the current or voltage of arm is normal, if it is not, then think that upper bridge breaks down, later, A of the comparator to third and door 450 Input terminal input high level is equivalent to and informs that failure occurs in bridge on third and door 450, at this point, third and door 450 export high electricity It is flat.

4th with door 460 be 4 input and door.Specifically, the 4th is effective with four equal high level of input terminal of door 460.And And the 4th with door 460, third and door 450 export the 5th level, the second trigger 430 exports the 4th level, the first trigger When the second output terminal of 410 the first level of output and latch 421 exports second electrical level, 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 can be understood as each power device for controlling lower bridge, which is in, leads Logical state, so that the energy of motor is all fallen by lower bridge and motor internal consumption.4th controls motor driven with door 460 The specific implementation of the lower bridge short circuit of circuit 100 is for example are as follows: if each power device of motor-drive circuit 100 is high in input Electric conducts can be by motor-drive circuit after then when the 4th with each power device input high level of the downward bridge of door 460 100 lower bridge short circuit;If each power device of motor-drive circuit 100 is connected in input low level, the 4th with door 460 Output end each power device of lower bridge is connected by phase inverter, after the 4th exports high level with door 460, after phase inverter The lower bridge short circuit of motor-drive circuit 100 can equally be made.

Therefore, after the failure of upper bridge, motor are in high-speed cruising state and overcurrent occurs in current of electric, pass through the 4th It can be by lower bridge short circuit, so that the energy of motor is all fallen by lower bridge and motor internal consumption with door 460.

Further, with continued reference to FIG. 2, above-mentioned protection circuit 400 further include the 5th with door 470 and the 6th with door 480. 5th connect with the output end of door 470 with the 6th with the first input end (i.e. the port D) of door 480.6th is defeated with the second of door 480 Enter (i.e. C port), third input terminal (i.e. the port B), the 4th input terminal (i.e. the port A) is held to be connected respectively the second trigger The second output terminal (i.e. 2 ports) of 430 output end, the output end of the first trigger 410, latch 421.

Second trigger 430 is when the revolving speed of motor is greater than the second rotary speed threshold value, output and the 4th of third level inversion Level (that is: for third level if it is low level, the 4th level is high level).Optionally, the second rotary speed threshold value is greater than first Rotary speed threshold value, at this moment the first rotary speed threshold value and the second rotary speed threshold value constitute hysteresis section, can be to avoid the first rotary speed threshold value and the Two rotary speed threshold values make the second trigger 430 frequently beat when identical the phenomenon that.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 after the lower bridge of three-phase inverter bridge circuit breaks down with door 470 It is flat).Wherein, lower bridge includes three be located below the bridge arm 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 level is effective.On how to judge that lower bridge goes out Existing failure, such as: whether the current or voltage that each bridge arm in lower bridge is detected by current sampling circuit and comparator is normal, such as Fruit is no, then it is assumed that lower bridge breaks down, and later, comparator is equivalent to announcement to the 5th and the A input terminal input high level of door 470 Know that the 5th failure occurs with the lower bridge of door 470, the 5th exports high level with door 470 at this time.Specifically, the 5th is defeated with the B of door 470 Enter end to connect with above-mentioned third with the A input terminal of door 450.5th is defeated with the A input terminal and above-mentioned third and the B of door 450 of door 470 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 with door 480, the 5th with door 470 export the 6th level, the second trigger 430 export the 4th level, the first trigger When the second output terminal of 410 the first level of output and latch 421 exports second electrical level, 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 can be understood as each power device of bridge, which is in, in control leads Logical state, so that the energy of motor is all fallen by upper bridge and motor internal consumption.6th controls motor driven with door 480 The specific implementation of the upper bridge short circuit of circuit 100 is for example are as follows: if each power device of motor-drive circuit 100 is high in input Electric conducts can be by motor-drive circuit after then when the 6th with each power device input high level of the upward bridge of door 480 100 upper bridge short circuit;If each power device of motor-drive circuit 100 is connected in input low level, the 6th with door 480 Output end each power device of upper bridge is connected by phase inverter, after the 6th exports high level with door 480, after phase inverter The upper bridge short circuit of motor-drive circuit 100 can equally be made.

Therefore, after the failure of lower bridge, motor are in high-speed cruising state and overcurrent occurs in motor, pass through the 6th and door 480 can be by upper bridge short circuit, so that the energy of motor is all fallen by upper bridge and motor internal consumption.

Further, with continued reference to FIG. 2, protection circuit 400 further include the 7th with door 491 and the 8th with door 492.7th It is connect with the output end of door 491 with the 8th with the first input end (i.e. C port) of door 492.8th with the second input terminal of door 492 (i.e. the port B), third input terminal (i.e. the port A) be connected respectively the output end of the first trigger 410, latch 421 Two output ends.

7th exports the 7th level with door 491 after the Shang Qiao of three-phase inverter bridge circuit and lower bridge break down simultaneously (such as high level).Specifically, the 7th it is defaulted as low level with two input terminals of door 491, and high level is effective.About such as What judges Shang Qiao and lower bridge while breaking down, such as is detected in Shang Qiao and lower bridge respectively by current sampling circuit and comparator Whether the current or voltage 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 terminal while input high level, are equivalent to informing the 7th and 491 Shang Qiao of door and failure occurs simultaneously in lower bridge, this When, the 7th exports high level with door 491.Specifically, it the 7th is inputted with the A of the A input terminal of door 491 and above-mentioned third and door 450 End connection.7th connect with the B input terminal of door 491 with the above-mentioned 5th with the A input terminal 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 ends export second electrical level, output phase answers level to control each power device of three-phase inverter bridge circuit and be off State.The 8th specific implementation example in an off state with each power device of the control three-phase inverter bridge circuit of door 492 Such as are as follows: if each power device of motor-drive circuit 100 is disconnected in input high level, when the 8th with door 492 to each function After rate device input high level, each power device of motor-drive circuit 100 can be disconnected;If motor-drive circuit 100 Each power device disconnected in input low level, then the 8th each power device is connect by phase inverter with the output end of door 492, After the 8th exports high level with door 492, by each power device that can equally make motor-drive circuit 100 after phase inverter It disconnects.

Therefore, it breaks down simultaneously in Shang Qiao and lower bridge, and when overcurrent occurs in motor, it can be with door 480 by the 6th In time by the switched on line state of motor-drive circuit 100.

Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality It applies 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, all should be considered as described in this specification.

The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations;Although with reference to the foregoing embodiments Invention is explained in detail, those skilled in the art should understand that: it still can be to aforementioned each implementation Technical solution documented by example is modified or equivalent replacement of some of the technical features;And these modification or Replacement, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution.

Claims (10)

1. a kind of protection system for motor, for controlling motor-drive circuit, which is characterized in that the protection system for motor includes: Monitor circuit, protection circuit, motor-drive circuit and processor;
The monitoring circuit and the protection circuit connection;
The protection circuit is connect with the motor-drive circuit and the processor respectively;
The processor is also connect with the motor-drive circuit;
The monitoring circuit is used to monitor the electric current of motor, and sends out when the electric current is greater than overcurrent threshold value to the protection circuit Over-current signal is sent, so that the protection circuit stops control of the processor to the motor-drive circuit, and the protection Circuit reduces the electric current by controlling the motor-drive circuit;
First of motor-drive circuit described in the protection circuit control executes speed and is greater than the processor control motor The second of driving circuit executes speed.
2. protection system for motor according to claim 1, which is characterized in that the monitoring circuit is monitoring the electric current When less than secure threshold, is sent to the protection circuit and restore signal;
The protection circuit restores control of the processor to the motor-drive circuit after receiving the recovery signal, and And the protection circuit stops the control to the motor-drive circuit.
3. protection system for motor according to claim 1, which is characterized in that the protection circuit include the first trigger and Logic control element;The input terminal of first trigger is connect with the output end of the monitoring circuit, first trigger Output end connect respectively with the logic control element and the processor;
First trigger exports the first level when receiving the over-current signal;
The processor stops controlling the motor drive when receiving first level exported by first trigger Dynamic circuit;
The logic control element controls the motor when receiving first level exported by first trigger Driving circuit stops driving the motor.
4. protection system for motor according to claim 3, which is characterized in that the logic control element include latch and First and door;
The input terminal of the latch and described first be all connected with first trigger with the first input end of door output end; First output end of the latch is connect with described first with the second input terminal of door;
The latch passes through the first output end after the setting time that is delayed when first trigger exports first level Export second electrical level;Described first and door first trigger export first level and the latch it is first defeated When outlet exports the second electrical level, output phase answers level to control the motor-drive circuit and stop driving the motor.
5. protection system for motor according to claim 4, which is characterized in that the protection circuit further includes the second trigger And second and door;
The output end of second trigger is connect with described second with the first input end of door, and described second is defeated with the second of door Enter end to connect with the second output terminal of the latch;
First output end of the latch is two complementary output ends with second output terminal;
Second trigger exports third level when the revolving 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 third level and the latch exports the second electrical level, Output phase answers level to control the motor-drive circuit and stop driving the motor.
6. protection system for motor according to claim 5, which is characterized in that the motor-drive circuit is that three-phase bridge is inverse Power transformation road.
7. protection system for motor according to claim 6, which is characterized in that the protection circuit further include third and door and 4th and door;
The output end of the third and door is connect with the described 4th with the first input end of door;
Described 4th is connected respectively second trigger with the second input terminal, third input terminal, the 4th input terminal of door Output end, the output end of first trigger and the second output terminal of the latch;
Second trigger is when the revolving speed of the motor is greater than the second rotary speed threshold value, output and the third level inversion 4th level;
The third and door export the 5th level after the upper bridge of the three-phase inverter bridge circuit breaks down;
Described 4th and door, the 5th level, second trigger output the 4th electricity are exported in the third and door When the second output terminal that flat, described first trigger exports first level and the latch exports the second electrical level, Output phase answers level to control the short circuit of the lower bridge of the three-phase inverter bridge circuit.
8. protection system for motor according to claim 6, which is characterized in that the protection circuit further include the 5th with door and 6th and door;
Described 5th connect with the output end of door with the described 6th with the first input end of door;
Described 6th is connected respectively second trigger with the second input terminal, third input terminal, the 4th input terminal of door Output end, the output end of first trigger, the latch second output terminal;
Second trigger is when the revolving speed of the motor is greater than the second rotary speed threshold value, output and the third level inversion 4th level;
Described 5th and door the three-phase inverter bridge circuit lower bridge break down after export the 6th level;
Described 6th and door, the 6th level, second trigger output the 4th electricity are exported with door the described 5th When the second output terminal that flat, described first trigger exports first level and the latch exports the second electrical level, Output phase answers level to control the short circuit of the upper bridge of the three-phase inverter bridge circuit.
9. protection system for motor according to claim 6, which is characterized in that the protection circuit further include the 7th with Door and the 8th and door;
Described 7th connect with the output end of door with the described 8th with the first input end of door;
Described 8th is connected respectively the output end of first trigger, institute with the second input terminal, the third input terminal of door State the second output terminal of latch;
Described 7th and door the 7th level is exported after the Shang Qiao of the three-phase inverter bridge circuit and lower bridge break down simultaneously;
Described 8th and door the described 7th exports the 7th level with door, first trigger exports first level And the latch second output terminal export the second electrical level when, output phase answers level to control the three-phase bridge type inverse Each power device of circuit is in an off state.
10. the protection system for motor according to any one of claim 4 to 9, which is characterized in that the setting time is 2us is between 20us.
CN201810994914.2A 2018-08-29 2018-08-29 Protection system for motor CN109038498A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103050944A (en) * 2012-11-02 2013-04-17 深圳市航盛电子股份有限公司 Traction motor controller for electric vehicle
CN103312262A (en) * 2012-03-15 2013-09-18 日立空调·家用电器株式会社 Motor drive device, fluid compression system and air conditioner
US9214885B1 (en) * 2014-06-25 2015-12-15 Nidec Motor Corporation Independent pathways for detecting fault condition in electric motor
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
CN207251187U (en) * 2017-08-09 2018-04-17 深圳腾势新能源汽车有限公司 Protection system for motor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103312262A (en) * 2012-03-15 2013-09-18 日立空调·家用电器株式会社 Motor drive device, fluid compression system and air conditioner
CN103050944A (en) * 2012-11-02 2013-04-17 深圳市航盛电子股份有限公司 Traction motor controller for electric vehicle
US9214885B1 (en) * 2014-06-25 2015-12-15 Nidec Motor Corporation Independent pathways for detecting fault condition in electric motor
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
CN207251187U (en) * 2017-08-09 2018-04-17 深圳腾势新能源汽车有限公司 Protection system for motor

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