CN209516618U - A kind of permanent magnet synchronous motor counter electromotive force protective device - Google Patents
A kind of permanent magnet synchronous motor counter electromotive force protective device Download PDFInfo
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- CN209516618U CN209516618U CN201821635975.1U CN201821635975U CN209516618U CN 209516618 U CN209516618 U CN 209516618U CN 201821635975 U CN201821635975 U CN 201821635975U CN 209516618 U CN209516618 U CN 209516618U
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Abstract
The utility model provides a kind of permanent magnet synchronous motor counter electromotive force protective device, including battery, power battery, electric machine controller with three phase inverter bridge, protect circuit and permanent magnet synchronous motor, the battery provides low-voltage control power to electric machine controller, the power battery provides high voltage power power supply to electric machine controller, electric machine controller is output to permanent magnet synchronous motor after high voltage power power supply is switched to three-phase alternating current, the input terminal connection electric machine controller and power battery of the protection circuit, the output end of protection circuit is directly connected to the control terminal of three phase inverter bridge in electric machine controller.The utility model is for preventing power supply or driving equipment from damaging because generating counter electromotive force in emergency case; due to being equipped with protection circuit; the present apparatus can work in the case where controlling power cut-off and whole device is made to enter safe state, improve reliability and safety.
Description
Technical field
The utility model relates to a kind of counter electromotive force protective device, in particular to a kind of permanent magnet synchronous motor counter electromotive force is protected
Protection unit.
Background technique
When electric machine controller drives permanent magnet synchronous motor high-speed cruising, if occur suddenly motor speed abnormal, over-voltage or
When person's high pressure accident power-off, low pressure are surprisingly lost, it will usually directly close the output of controller；If revolving speed is excessively high to be in depth
Weak magnetic area, motor will generate very high counter electromotive force at this time, and be added to motor control after the rectification of the backward dioded of IGBT
On device bus, it is more likely that directly damage the IGBT and capacitor of controller.
Existing technology usually realizes that counter electromotive force is protected by way of software and hardware combining, but is the need to ensure that control electricity
Source works normally, if control power supply goes wrong, this kind of protective device cannot make a response for counter electromotive force, Wu Faqi
To protective effect.
The following are documents.
The utility model of publication number CN202134893U is related to the control device field for controlling synchronous motor, tool
Body is a kind of protective device of high back electromotive force synchronous motor.A kind of protective device of high back electromotive force synchronous motor, including electricity
Pond, inverter and permanent magnet synchronous motor, it is characterized in that: further including hysteresis comparator and Complex Programmable Logic Devices, inverter
High voltage direct current end and three-phase electricity output end be separately connected hysteresis comparator and Complex Programmable Logic Devices, hysteresis comparator is logical
Signal wire connection Complex Programmable Logic Devices is crossed, hysteresis comparator is by twin voltage comparator, resistance first, capacitor first and direct current
Source composition.The utility model strong interference immunity, is swift in response, good to electric motor protecting effect.
Above-mentioned documents are able to achieve the function of counter electromotive force protection, but work can not then be continued by control power cut-off occur
Make.
Utility model content
Aiming at the problem that traditional counter electromotive force protective device can not work on once controlling power cut-off, this is practical new
Type provides a kind of permanent magnet synchronous motor counter electromotive force protective device, can work on, mention in the case where controlling power cut-off
High reliability and safety.
The following are the technical solution of the utility model.
A kind of permanent magnet synchronous motor counter electromotive force protective device, including battery, power battery, with the electricity of three phase inverter bridge
Machine controller, protection circuit and permanent magnet synchronous motor, the battery offer low-voltage control power are described to electric machine controller
Power battery provides high voltage power power supply to electric machine controller, after high voltage power power supply is switched to three-phase alternating current by electric machine controller
It is output to permanent magnet synchronous motor, the input terminal connection electric machine controller and power battery of the protection circuit protect circuit
Output end is directly connected to the control terminal of three phase inverter bridge in electric machine controller.The electric machine controller of the utility model controls three contraries
The direct current of power battery is converted to three-phase alternating current and supplies electricity to motor by change bridge, when catastrophe failure occurs in electric system high-speed cruising
When, electric machine controller disconnects the upper bridge arm of three phase inverter bridge, lower bridge arm closure, and counter electromotive force of motor is prevented to be added to DC side
Damage equipment；When battery powers off, electric machine controller failure protects circuit from high voltage direct current side to convert out spare control power supply straight
Control three phase inverter bridge is connect, protection work is completed；It is whether normal that no matter power supply is controlled, and all controllable system enters safe condition.
Preferably, the protection circuit include several capacitors, several resistance, several field-effect tube, several diodes with
And triode, the anode of the power battery connect the anode of zener diode D1, zener diode by several current-limiting resistances
The cathode of D1 connects and connects the grid of field-effect tube Q3 after several current-limiting resistances, and the drain electrode of field-effect tube Q3 connects two pole of pressure stabilizing
The cathode of pipe D1, the drain electrode of field-effect tube Q2 pass through the grid of resistance R9 connection field-effect tube Q3, and the grid of field-effect tube Q2 connects
One end of connecting resistance R12, the other end of resistance R12 is by current-limiting resistance R13 connection electric machine controller, while resistance R12's is another
One end several current-limiting resistance ground connection in parallel, the anode of the source electrode connection diode D4 of field-effect tube Q2, the cathode of diode D4 connect
Connect the anode of diode D5, the minus earth of diode D5, the grid of the collector connection field-effect tube Q3 of triode Q1, three poles
The collector of pipe Q1 is grounded by capacitor C4, the cathode of the emitter connection zener diode D3 of triode Q1, zener diode
The plus earth of D3, the base stage of triode Q1 pass through the source electrode of resistance R10 connection field-effect tube Q3, the source electrode of field-effect tube Q3 and
The grid of field-effect tube Q3 is connected by capacitor C2, the first end of the source electrode connection resistance R11 of field-effect tube Q3, resistance R11's
Second end is grounded by capacitor C5, and the second end of resistance R11 connects the anode of rectifier diode group D2, rectifier diode group simultaneously
The first pin of the cathode jointing J1 of D2, the first pin of connector J1 is as in spare control power supply connection electric machine controller
Three phase inverter bridge, the second pin ground connection of connector J1, the third pin of connector J1 connects electric machine controller.The circuit is in this way
Operation: when battery normal power supply, the one end for connecting electric machine controller is high level, i.e., the grid of field-effect tube Q2 is height
Level, so that drain electrode and the source conduction of field-effect tube Q2, then the grid of field-effect tube Q3 is low level, i.e. field-effect tube Q3's
Source electrode and drain electrode disconnect, and the voltage of power battery can not be transmitted to other circuits, so the output end of the circuit is without electricity at this time
Pressure, does not provide backup power source, while diode group D2 prevents the control voltage of three phase inverter bridge from flowing back into the circuit；Work as electric power storage
When bottle power-off, the grid of field-effect tube Q2 becomes low level, and the source electrode of field-effect tube Q2 and drain electrode disconnect, so that field-effect tube Q3
Grid become high level, the source electrode of field-effect tube Q3 and drain electrode are connected, and the potential conduction of power battery is to field-effect tube Q3's
Source electrode, when VDD15LUB_H rises to the pressure drop than a zener diode pipe diode of D1 high, triode Q1 is complete
Conducting, the grid of collector i.e. field-effect tube Q3 are clamped to the voltage of voltage-stabiliser tube, and field-effect tube Q3 is turned off, at this time
VDD15LUB_H voltage is reduced, and subsequent field-effect tube Q3 can just be opened again, and VDD15LUB_H voltage rises again, this is one negative anti-
The process of dynamic pressure stabilizing is presented, realizes the stable output of output end.
Preferably, the performer of the three phase inverter bridge is IGBT.IGBT is insulated gate bipolar transistor, is ratio
More typical also reliable semiconductor devices, can satisfy the demand of the technical program.
The utility model has the following beneficial effects: can work in the case where controlling power cut-off, counter electromotive force is prevented
Equipment is damaged, reliability and safety are improved.
Detailed description of the invention
Fig. 1 show the structural schematic diagram of the utility model；
Fig. 2 show the structural schematic diagram of three phase inverter bridge；
Fig. 3 show the working state schematic representation of three phase inverter bridge；
Fig. 4 show the circuit diagram of the protection circuit of the utility model；
In Fig. 2: the control terminal of 1- three phase inverter bridge.
Specific embodiment
The technical program is further elaborated below according to Figure of description.
It is as shown in Figure 1 a kind of permanent magnet synchronous motor counter electromotive force protective device, including battery, power battery, band three
Electric machine controller, protection circuit and the permanent magnet synchronous motor of phase inverter bridge, the battery provide low-voltage control power to electricity
Machine controller, the power battery provide high voltage power power supply to electric machine controller, and electric machine controller turns high voltage power power supply
To be output to permanent magnet synchronous motor, the input terminal connection electric machine controller and power electric of the protection circuit after three-phase alternating current
Pond protects the output end of circuit to be directly connected to the control terminal of three phase inverter bridge in electric machine controller.The motor control of the utility model
The direct current of power battery is converted to three-phase alternating current and supplies electricity to motor by device control three phase inverter bridge processed, and protection circuit can be in control electricity
Source works in the case where powering off, and prevents counter electromotive force from damaging equipment, improves reliability and safety.
As shown in Fig. 2, the output end of protection circuit is directly connected to the control terminal 1 of three phase inverter bridge.
As shown in figure 3, when catastrophe failure occurs in electric system high-speed cruising, electric machine controller is by the upper of three phase inverter bridge
Bridge arm disconnect, lower bridge arm closure, prevent counter electromotive force of motor be added to DC side damage equipment；When battery powers off, motor control
Device failure processed, protection circuit convert out spare control power supply from high voltage direct current side and directly control three phase inverter bridge, complete protection work
Make；It is whether normal that no matter power supply is controlled, and all controllable system enters safe condition.
As shown in figure 4, the protection circuit include several capacitors, several resistance, several field-effect tube, several diodes with
And triode, the anode of the power battery connect the anode of zener diode D1, zener diode by several current-limiting resistances
The cathode of D1 connects and connects the grid of field-effect tube Q3 after several current-limiting resistances, and the drain electrode of field-effect tube Q3 connects two pole of pressure stabilizing
The cathode of pipe D1, the drain electrode of field-effect tube Q2 pass through the grid of resistance R9 connection field-effect tube Q3, and the grid of field-effect tube Q2 connects
One end of connecting resistance R12, the other end of resistance R12 is by current-limiting resistance R13 connection electric machine controller, while resistance R12's is another
One end several current-limiting resistance ground connection in parallel, the anode of the source electrode connection diode D4 of field-effect tube Q2, the cathode of diode D4 connect
Connect the anode of diode D5, the minus earth of diode D5, the grid of the collector connection field-effect tube Q3 of triode Q1, three poles
The collector of pipe Q1 is grounded by capacitor C4, the cathode of the emitter connection zener diode D3 of triode Q1, zener diode
The plus earth of D3, the base stage of triode Q1 pass through the source electrode of resistance R10 connection field-effect tube Q3, the source electrode of field-effect tube Q3 and
The grid of field-effect tube Q3 is connected by capacitor C2, the first end of the source electrode connection resistance R11 of field-effect tube Q3, resistance R11's
Second end is grounded by capacitor C5, and the second end of resistance R11 connects the anode of rectifier diode group D2, rectifier diode group simultaneously
The first pin of the cathode jointing J1 of D2, the first pin of connector J1 is as in spare control power supply connection electric machine controller
Three phase inverter bridge, the second pin ground connection of connector J1, the third pin of connector J1 connects electric machine controller.The circuit is in this way
Operation: when battery normal power supply, the one end for connecting electric machine controller is high level, i.e., the grid of field-effect tube Q2 is height
Level, so that drain electrode and the source conduction of field-effect tube Q2, then the grid of field-effect tube Q3 is low level, i.e. field-effect tube Q3's
Source electrode and drain electrode disconnect, and the voltage of power battery can not be transmitted to other circuits, so the output end of the circuit is without electricity at this time
Pressure, does not provide backup power source, while diode group D2 prevents the control voltage of three phase inverter bridge from flowing back into the circuit；Work as electric power storage
When bottle power-off, the grid of field-effect tube Q2 becomes low level, and the source electrode of field-effect tube Q2 and drain electrode disconnect, so that field-effect tube Q3
Grid become high level, the source electrode of field-effect tube Q3 and drain electrode are connected, and the potential conduction of power battery is to field-effect tube Q3's
Source electrode, when VDD15LUB_H rises to the pressure drop than a zener diode pipe diode of D1 high, triode Q1 is complete
Conducting, the grid of collector i.e. field-effect tube Q3 are clamped to the voltage of voltage-stabiliser tube, and field-effect tube Q3 is turned off, at this time
VDD15LUB_H voltage is reduced, and subsequent field-effect tube Q3 can just be opened again, and VDD15LUB_H voltage rises again, this is one negative anti-
The process of dynamic pressure stabilizing is presented, realizes the stable output of output end.In the present embodiment, number R1, R2, R3, R4, R5, R6, R7,
The resistance of R8 is current-limiting resistance, and capacitor C4 is 1nf, and capacitor C5 is 1uf.
In the present embodiment, the performer of the three phase inverter bridge is IGBT.IGBT is insulated gate bipolar transistor, is
Relatively common also reliable semiconductor devices can satisfy the demand of the technical program.
It should be noted that the specific embodiment is only used for that technical solution is further described, it is not used in and limits the skill
The range of art scheme, any modifications, equivalent substitutions and improvements etc. based on this technical solution are regarded as in the utility model
In protection scope.
Claims (3)
1. a kind of permanent magnet synchronous motor counter electromotive force protective device, which is characterized in that including battery, power battery, band three-phase
Electric machine controller, protection circuit and the permanent magnet synchronous motor of inverter bridge, the battery provide low-voltage control power to motor
Controller, the power battery provide high voltage power power supply to electric machine controller, and electric machine controller switchs to high voltage power power supply
Permanent magnet synchronous motor, the input terminal connection electric machine controller and power electric of the protection circuit are output to after three-phase alternating current
Pond protects the output end of circuit to be directly connected to the control terminal of three phase inverter bridge in electric machine controller.
2. a kind of permanent magnet synchronous motor counter electromotive force protective device according to claim 1, which is characterized in that the protection
Circuit includes several capacitors, several resistance, several field-effect tube, several diodes and triode, and the power battery is just
Pole connects the anode of zener diode D1 by several current-limiting resistances, and the cathode of zener diode D1 is connected several current-limiting resistances
The grid of field-effect tube Q3, the cathode of the drain electrode connection zener diode D1 of field-effect tube Q3, the leakage of field-effect tube Q2 are connected afterwards
Pole passes through the grid of resistance R9 connection field-effect tube Q3, and the grid of field-effect tube Q2 connects one end of resistance R12, resistance R12's
The other end is by current-limiting resistance R13 connection electric machine controller, while the other end several current-limiting resistances in parallel of resistance R12 are grounded,
The anode of the source electrode connection diode D4 of field-effect tube Q2, the anode of the cathode connection diode D5 of diode D4, diode D5
Minus earth, the grid of the collector connection field-effect tube Q3 of triode Q1, the collector of triode Q1 connect by capacitor C4
Ground, the cathode of the emitter connection zener diode D3 of triode Q1, the plus earth of zener diode D3, the base of triode Q1
Pole passes through the source electrode of resistance R10 connection field-effect tube Q3, and the source electrode of field-effect tube Q3 and the grid of field-effect tube Q3 pass through capacitor
C2 connection, the first end of the source electrode connection resistance R11 of field-effect tube Q3, the second end of resistance R11 are grounded by capacitor C5, resistance
The second end of R11 while the anode for connecting rectifier diode group D2, the first of the cathode jointing J1 of rectifier diode group D2
Pin, control terminal of the first pin of connector J1 as three phase inverter bridge in spare control power supply connection electric machine controller, connector
The second pin of J1 is grounded, and the third pin of connector J1 connects electric machine controller.
3. a kind of permanent magnet synchronous motor counter electromotive force protective device according to claim 1, which is characterized in that the three-phase
The performer of inverter bridge is IGBT.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821635975.1U CN209516618U (en) | 2018-10-09 | 2018-10-09 | A kind of permanent magnet synchronous motor counter electromotive force protective device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821635975.1U CN209516618U (en) | 2018-10-09 | 2018-10-09 | A kind of permanent magnet synchronous motor counter electromotive force protective device |
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| Publication Number | Publication Date |
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| CN209516618U true CN209516618U (en) | 2019-10-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201821635975.1U Active CN209516618U (en) | 2018-10-09 | 2018-10-09 | A kind of permanent magnet synchronous motor counter electromotive force protective device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111030052A (en) * | 2019-12-04 | 2020-04-17 | 航天信息股份有限公司 | Back electromotive force protection circuit and motor |
| CN116015164A (en) * | 2023-02-01 | 2023-04-25 | 武汉中岩科技股份有限公司 | Motor back electromotive force protection circuit |
-
2018
- 2018-10-09 CN CN201821635975.1U patent/CN209516618U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111030052A (en) * | 2019-12-04 | 2020-04-17 | 航天信息股份有限公司 | Back electromotive force protection circuit and motor |
| CN111030052B (en) * | 2019-12-04 | 2022-06-17 | 航天信息股份有限公司 | Back electromotive force protection circuit and motor |
| CN116015164A (en) * | 2023-02-01 | 2023-04-25 | 武汉中岩科技股份有限公司 | Motor back electromotive force protection circuit |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
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| TR01 | Transfer of patent right |
Effective date of registration: 20200525 Address after: 610100 Chengdu City Economic and Technological Development Zone, Sichuan (Longquanyi District) 111 Patentee after: ZHONGZHI YIKE CHENGDU AUTOMOBILE Co.,Ltd. Address before: No. 371 Chunan County, Hangzhou island of Zhejiang province 311700 City Gushan Town Road Patentee before: ZHEJIANG YUNDI ELECTRIC TECHNOLOGY Co.,Ltd. |