CN208849663U - Protection circuit of inverter and servosystem - Google Patents

Protection circuit of inverter and servosystem Download PDF

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Publication number
CN208849663U
CN208849663U CN201821833327.7U CN201821833327U CN208849663U CN 208849663 U CN208849663 U CN 208849663U CN 201821833327 U CN201821833327 U CN 201821833327U CN 208849663 U CN208849663 U CN 208849663U
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China
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inverter
circuit
control
power
current
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高健
谭章德
王子荣
刘亮
呼文超
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Abstract

This application involves a kind of protection circuit of inverter and servosystems; the protection circuit includes power-supplying circuit, buffer control circuit, power switch component and current buffering component; power switch component and current buffering component are set in the bus of connection inverter; power-supplying circuit connects power switch component, is also used to connect main control chip;Buffer control circuit connects power-supplying circuit and current buffering component.Control bus accesses direct current and is delivered to inverter and carries out current limliting to the direct current of access after Continuity signal by receiving main control chip transmission, system initialization commands can be first carried out in main control chip ensures the device for power switching of inverter after the slave mode of safety, execute bus again powers on control command, the case where being established before avoiding busbar voltage from providing determining driving signal prior to the driving circuit of the every phase upper and lower bridge arm of inverter, and electric current is powered on to initial bus and carries out current limliting cushioning control, improve the Supply Security of inverter.

Description

Protection circuit of inverter and servosystem
Technical field
This application involves technical field of servo control, more particularly to a kind of protection circuit of inverter and servosystem.
Background technique
With the rapid development of social progress and science and technology, all kinds of servo motor products start to be widely used in national product The every aspect of life, wherein permanent-magnet alternating current servo motor is simple, small in size with its structure, power factor is high, rotary inertia is small The advantages that with most wide application prospect.
Pulse width modulation technique is generallyd use in traditional AC servo, main circuit power passes through rectification, inversion Required electric energy is provided after process for servo motor.But when servo-system powers on for the first time, every phase upper and lower bridge arm in inverter Control level be by control loop main control chip complete initialization after provide, can exist at this time busbar voltage prior to The case where driving circuit of every phase upper and lower bridge arm is established before providing determining driving signal, can make inversion in extreme circumstances The device for power switching (IGBT) of device is connected automatically, in turn results in the danger of busbar short-circuit.Therefore, how to improve and inverter is supplied The safety of electricity becomes urgent problem to be solved.
Utility model content
Based on this, it is necessary to for the low problem of safety of traditional AC servo to inverter power supply, provide A kind of protection circuit of inverter and servosystem of the Supply Security that inverter can be improved.
A kind of protection circuit of inverter, comprising:
After the Continuity signal for receiving main control chip transmission, the power-supplying circuit of power switch element turns is controlled;
In conducting, control bus accesses direct current and is delivered to the power switch component of inverter;
Electric current is controlled after the power-supplying circuit receives the Continuity signal preset duration that the main control chip is sent The buffer control circuit of Buffer Unit short circuit;
The current buffering component of current limliting is carried out to the direct current conveyed in the bus when not short-circuit;The power supply Switch block and the current buffering component are set in the bus of connection inverter, and the power-supplying circuit connects the confession Electric switch unit is also used to connect the main control chip;The buffer control circuit connects the power-supplying circuit and described Current buffering component.
A kind of servosystem, including inverter, motor, main control chip and above-mentioned protection circuit of inverter, the master control core Piece connects the inverter and the power-supplying circuit, and the inverter connects the motor, the power switch component and Current buffering component is set in the bus for connecting the inverter.
Above-mentioned protection circuit of inverter and servosystem, power-supplying circuit is in the conducting letter for receiving main control chip transmission After number, control power switch element turns are so that bus accesses direct current and is delivered to inverter.Current buffering component is not short Current limliting is carried out to the direct current conveyed in bus when road, buffer control circuit receives main control chip in power-supplying circuit and sends Continuity signal preset duration after control the short circuit of current buffering component stop current limliting.The conducting letter sent by receiving main control chip Control bus accesses direct current and is delivered to inverter and carries out current limliting to the direct current of access after number, can be in main control chip First carrying out system initialization commands ensures that the device for power switching of inverter is in the slave mode of safety and then executes bus Power on control command, avoid busbar voltage from providing determining driving signal prior to the driving circuit of the every phase upper and lower bridge arm of inverter The case where establishing before, and electric current is powered on to initial bus and carries out current limliting cushioning control, avoid the device for power switching of inverter Automatic conducting, reduces busbar short-circuit risk, improves the Supply Security of inverter.
Detailed description of the invention
Fig. 1 is the structural block diagram of protection circuit of inverter in an embodiment;
Fig. 2 is the schematic diagram of protection circuit of inverter in an embodiment;
Fig. 3 is the schematic diagram of inverter in an embodiment;
Fig. 4 is the upper electrical schematic diagram of servosystem in an embodiment.
Specific embodiment
It is with reference to the accompanying drawings and embodiments, right in order to which the objects, technical solutions and advantages of the application are more clearly understood The application is further elaborated.It should be appreciated that specific embodiment described herein is only used to explain the application, not For limiting the application.
In one embodiment, a kind of protection circuit of inverter is provided, as shown in Figure 1, including power-supplying circuit 110, buffer control circuit 120, power switch component 130 and current buffering component 140, power switch component 130 and electric current are slow It rushes component 140 to be set in the bus of connection inverter 200, power-supplying circuit 110 connects power switch component 130, also uses In connection main control chip;Buffer control circuit 120 connects power-supplying circuit 110 and current buffering component 140.
Power-supplying circuit 110 is used for after the Continuity signal for receiving main control chip transmission, controls power switch component 130 conductings, the control bus in conducting of power switch component 130 access direct current and are delivered to inverter 200;Cushioning control electricity Road 120 is used to control current buffering after the Continuity signal preset duration that power-supplying circuit 110 receives main control chip transmission 140 short circuit of component, current buffering component 140 carry out current limliting to the direct current conveyed in bus when not short-circuit.
Specifically, inverter 200 is used to after the direct current that bus accesses is converted to alternating current export, inverter 200 Type is not unique, specifically can be three-phase bridge PWM (Pulse Width Modulation, pulse width modulation) inverter It controls inverter 200 for output pwm signal to inverter 200 Deng, main control chip to work, specific output control level to inversion Every phase upper and lower bridge arm in device 200, to control the on-off of corresponding device for power switching.Bus includes firewire P and zero curve N, is supplied Electric switch unit 130 specifically may be disposed on the firewire P in bus or zero curve N.Firewire P and zero curve N is for connecting inverter 200, it accesses externally input direct current and is delivered to inverter 200, wherein externally input direct current specifically can be by whole The alternating current that current circuit provides three phase mains obtains after rectifying, and is also possible to directly be provided by external dc source.This reality It applies in example, the output cathode of firewire P connection rectification circuit+, the output negative pole-of zero curve N connection rectification circuit, in power switch group Direct current when part 130 is connected by rectification circuit output is delivered to inverter 200.
When bus powers on for the first time, the main control chip in control loop can undergo the process of an initialization, control system The time of more complicated initialization needed for it also can be longer, can provide an initial function after chip initiation process is completed The drive level (being generally defaulted as closing entirely) of rate switching device, the device for power switching in system is in the controlled of safety at this time State.Main control chip completes system initialization commands, it is ensured that the device for power switching of inverter 200 is in the controlled shape of safety Continuity signal is exported after state to power-supplying circuit 110.The concrete type of Continuity signal is not unique, can be high level or Low level, by taking Continuity signal is high level as an example, power-supplying circuit 110 controls power switch component after receiving high level 130 conductings, so that control bus accesses direct current and is delivered to inverter 200, at this point, being set to the current buffering component of bus The direct current of 140 pairs of accesses carries out current limliting.Buffer control circuit 120 receives main control chip in power-supplying circuit 110 and sends High level preset duration after the control short circuit of current buffering component 140, current buffering component 140 stops straight to what is conveyed in bus Galvanic electricity carries out current limliting.The specific value of preset duration is not unique, can be according to actual needs by buffer control circuit 120 Device parameters select to be configured.Bus line delay is powered on when bus powers on for the first time and buffer protection, is avoided first The device for power switching of inverter the case where there are uncontrolled conductings when powering on, to avoid busbar short-circuit.And in inversion After device operates normally, the upper and lower bridge arm of the every phase of inverter can be avoided by the dead time in the primary control program of main control chip It simultaneously turns on.
The specific structure of power-supplying circuit 110 is not unique, in one embodiment, as shown in Fig. 2, power supply control is electric Road 110 includes the first control switch Q1, first resistor R1, second resistance R2,3rd resistor R3 and the 4th resistance R4, first resistor One end connects the output end of the first control switch Q1 after R1 is in parallel with second resistance R2, and the other end is grounded PGND;First control is opened The input terminal for closing Q1 connects power switch component 130, and the control terminal of the first control switch Q1 passes through the 4th resistance R4 connection master control Chip is connect especially by port RELAY with main control chip.The type of first control switch Q1 is not unique, can be three poles Pipe or metal-oxide-semiconductor, in the present embodiment, the first control switch Q1 is triode, base stage as control terminal, emitter as output end, Collector is as input terminal.Specifically, the first control switch Q1 is after the high level continuity signal for receiving main control chip transmission Conducting, the first control switch Q1 control power switch component 130 in conducting is connected, so that bus can access direct current and be delivered to Inverter 200.
Accordingly, in one embodiment, power switch component 130 includes the first relay RLY1, the first relay Control coil one end of RLY1 connects the input terminal of the first control switch Q1, and the other end connects power access end IPM+15, and first The controlled switch of relay RLY1 is set on the firewire P of bus.Wherein, the first control switch Q1 has electric current stream in conducting The control coil of the first relay RLY1 is crossed, control coil generates magnetic field since electric current flows through to be attracted controlled switch, at this time Direct current can be just added on the bus of connection inverter 200.The concrete type of first relay RLY1 is not unique, the present embodiment In, the first relay RLY1 is the relay that contact capacity is 16A/240VAC.
Further, in one embodiment, power switch component 130 further includes first capacitor C6 and first diode D1, first capacitor C6 and first diode D1 are in parallel with the control coil of the first relay RLY1, and first diode D1 Anode connects the control coil of the first relay RLY1 and the common end of the first control switch Q1.Pass through first capacitor C6 and first Diode D1 eliminates the counter electromotive force generated when the control coil power on/off of the first relay RLY1, avoids causing to do to circuit It disturbs, also can effectively protect the breakdown damage of circuit element, improve the reliability of protection circuit of inverter.
The specific structure of buffer control circuit 120 is also not uniquely, in one embodiment, with continued reference to Fig. 2, buffering Control circuit 120 includes the second control switch Q2, delay circuit 122, the 5th resistance R57 and the 6th resistance R58, delay circuit Control terminal, power-supplying circuit 110 and the current buffering component 140 of 122 the second control switch Q2 of connection, the second control switch Q2 Control terminal be grounded by the 5th resistance R57, the input terminal of the second control switch Q2 passes through the 6th resistance R58 connection current buffering Component 140, the output end ground connection of the second control switch Q2.Wherein, the second control switch Q2 uses triode, and base stage is as control End, emitter is as input terminal, and collector is as output end.Delay circuit 122 specifically connects first in power-supplying circuit 110 The output end of control switch Q1.When the conducting of power switch component 130 makes bus access direct current be delivered to inverter 200, electricity Stream Buffer Unit 140 powers on electric current to initial bus and carries out current limliting buffer protection, and delay circuit 122 is led in the second control switch Q2 The second control switch Q2 conducting is controlled after logical preset duration, is kept current buffering component 140 short-circuit, is stopped to the direct current on bus Carry out current limliting.
The specific structure of delay circuit 122 is also not uniquely, and in one embodiment, delay circuit 122 includes the 7th Resistance R55 and the second capacitor C34, the 7th resistance R55 and the second capacitor C34 connects and common end connects the second control switch Q2's Control terminal, the other end connection power-supplying circuit 110 and current buffering component 140 of the 7th resistance R55, specific connection is for automatically controlled The output end of first control switch Q1 in circuit 110 processed, the other end ground connection of the second capacitor C34.By configuring delay circuit 122 In the parameter of the 7th resistance R55 and the second capacitor C34 can control bus current limliting buffering delay time, in the first control switch Q1 The electric current exported after conducting charges to the second capacitor C34 by the 7th resistance R55, when the voltage on the second capacitor C34 reaches To the second control switch Q2 cut-in voltage when, the second control switch Q2 enters saturation conduction state, to make current buffering group Part 140 stops current limliting.
In another embodiment, delay circuit 122 includes the control terminal of the second control switch Q2 of connection, power-supplying circuit 110 and current buffering component 140 main control chip, main control chip the first control switch Q1 conducting after carry out current limliting delay essence Really control.Throttle-controlled operation is carried out by main control chip, precise control and stability are high.
In one embodiment, current buffering component 140 includes the second relay RLY2, current-limiting resistance RT1, third capacitor C1 and the 4th capacitor C2, current-limiting resistance RT1 are set on the firewire P of bus, and third capacitor C1 and the 4th capacitor C2 are connected to Between the firewire P and zero curve N of bus;Control coil one end of second relay RLY2 connects delay circuit 122, specifically connects the The control coil other end of the one end of seven resistance R55 far from the second capacitor C34, the second relay RLY2 passes through the 6th resistance R58 The input terminal of the second control switch Q2 is connected, the controlled switch of the second relay RLY2 is in parallel with current-limiting resistance RT1.Second relay The relay that contact capacity is 16A/240VAC equally can be used in device RLY2.
After bus delay powers on, first passes through current-limiting resistance RT1 and third capacitor C1 on bus and the 4th capacitor C2 are filled Electric current is limited, and when the voltage on the second capacitor C34 reaches the cut-in voltage of the second control switch Q2, the second control is opened Put into saturation conduction state, then electric current flows through in the control coil of the second relay RLY2, the second relay RLY2 by Control switch is attracted, so that the cushioning control for powering on electric current to initial bus is completed in current-limiting resistance RT1 short circuit.
Above-mentioned protection circuit of inverter accesses direct current by control bus after receiving the Continuity signal that main control chip is sent Electricity is simultaneously delivered to inverter and carries out current limliting to the direct current of access, and it is true can to first carry out system initialization commands in main control chip Slave mode and then execution bus of the device for power switching of guarantor's inverter in safety power on control command, avoid mother The case where line voltage is established before providing determining driving signal prior to the driving circuit of the every phase upper and lower bridge arm of inverter, and to first Beginning bus powers on electric current and carries out current limliting cushioning control, and the device for power switching of inverter is avoided to be connected automatically, reduces busbar short-circuit Risk improves the Supply Security of inverter.
In one embodiment, a kind of servosystem is additionally provided, including inverter, motor, main control chip and above-mentioned inverse Become device and protect circuit, main control chip connects inverter and power-supplying circuit, and inverter connects motor, power switch component and electricity Stream Buffer Unit is set in the bus of connection inverter.Further, inverter can be three-phase bridge PWM inverter.It watches Taking equipment may also include rectification circuit, and rectification circuit is connect by bus with inverter.Rectification circuit to the alternating current of access into Row rectification obtains direct current electricity output, and in power switch element turns, bus access direct current is delivered to inverter, current buffering Component carries out current limliting to the direct current conveyed in bus when not short-circuit.
To facilitate a better understanding of above-mentioned protection circuit of inverter and servosystem, below with the inverter in servosystem Explanation is explained in detail for protection circuit.
It is illustrated in figure 3 the topological structure of three-phase bridge PWM inverter, including device for power switching U30 to U35, inversion Device is converted to three-phase alternating current to the direct current of access and supplies electricity to motor power supply.When system operates normally, main control chip can be passed through Primary control program in dead time avoid the upper and lower bridge arm of the every phase of inverter from simultaneously turning on.But on servosystem is first When electric, as shown in Figure 4, the three-phase alternating current of three phase mains output is by being used as control loop power supply after breaker, for control Main control chip power supply in circuit processed, the three-phase alternating current of breaker output are used as main circuit power after passing through electromagnetic contactor, Rectifier circuit rectifies, which are supplied electricity to, as output three-phase alternating current obtains direct current.Due to powering on for control loop power supply and main circuit power Process is independent from each other, and the control level of the every phase upper and lower bridge arm of inverter is completed just by the main control chip in control loop It provides after beginningization, this will have busbar voltage and provides determining driving prior to the driving circuit of every phase upper and lower bridge arm at this time The case where establishing before signal, once this occurs after, due to existing between the gate pole and collector of device for power switching Miller capacitance, bus current will flow through this capacitor, so as to cause gate potentials rising, can make power switch in extreme circumstances Device is connected automatically, in turn results in the danger of busbar short-circuit.
For when servosystem powers on for the first time device for power switching there are uncontrolled conductings the case where, propose using after Electrical apparatus control circuit to the three-phase bridge PWM inverter in servosystem carry out delay power on, the inverter of buffer protection protect Circuit.By taking three-phase bridge PWM inversion topological structure as an example, the circuit diagram of protection circuit of inverter is as shown in Figure 2.
When bus powers on for the first time, the main control chip in control loop can undergo the process of an initialization, control system The time of more complicated initialization needed for it also can be longer, can provide an initial function after chip initiation process is completed The drive level (being generally defaulted as closing entirely) of rate switching device, the device for power switching in system is in the controlled of safety at this time State.
The first relay RLY1 and the second relay RLY2 is the relay that two contact capacities are 16A/240VAC in Fig. 2 Device, wherein the control terminal circuit operation principle of the first relay RLY1 are as follows: amplified by main control chip through the isolation of overdrive circuit After through port RELAY provide control signal to control the on-off of the first control switch Q1, when the first control switch Q1 is received After the high level continuity signal issued by main control chip, the first control switch Q1 is connected, and is just had electric current at this time and is flowed through first The control coil of relay RLY1, control coil since electric current flows through generate magnetic field to being attracted controlled switch, at this time by The direct current that rectifier rectification goes out can be just added on the bus of three-phase bridge PWM inverter circuit.As long as it can herein be seen that being System initialization commands are first carried out in system primary control program, it is ensured that device for power switching is in the slave mode of safety and then holds Row bus powers on control command, so that it may line busbar voltage be avoided to provide prior to the driving circuit of the every phase upper and lower bridge arm of inverter The case where being established before determining driving signal.
After bus delay powers on, current-limiting resistance RT1 is first passed through to the 4th capacitor C2 of capacitor third capacitor C1/ on bus Charging current is limited, at the same time in the control circuit of the second relay RLY2 electric current by the 7th resistance R55 to the Two capacitor C34 charge, when the voltage on the second capacitor C34 reaches the cut-in voltage of the second control switch Q2, the second control System switch Q2 enters saturation conduction state, and then electric current flows through in the control coil of the second relay RLY2, the second relay The controlled switch of RLY2 is attracted, to can be completed current-limiting resistance RT1 short circuit by the cooperation between the above circuit to first Beginning bus powers on the cushioning control of electric current.
Above-mentioned servosystem accesses direct current and defeated by control bus after receiving the Continuity signal that main control chip is sent It send to inverter and current limliting is carried out to the direct current of access, can first carry out system initialization commands in main control chip ensures inversion Slave mode and then execution bus of the device for power switching of device in safety power on control command, avoid line bus electric The case where being established before pressing the driving circuit prior to the every phase upper and lower bridge arm of inverter to provide determining driving signal, and to initial mother Line powers on electric current and carries out current limliting cushioning control, and the device for power switching of inverter is avoided to be connected automatically, reduces busbar short-circuit risk, Improve the Supply Security of inverter.
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 several embodiments of the application above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously The limitation to utility model patent range therefore cannot be interpreted as.It should be pointed out that for the ordinary skill people of this field For member, without departing from the concept of this application, various modifications and improvements can be made, these belong to the application's Protection scope.Therefore, the scope of protection shall be subject to the appended claims for the application patent.

Claims (10)

1. a kind of protection circuit of inverter characterized by comprising
After the Continuity signal for receiving main control chip transmission, the power-supplying circuit of power switch element turns is controlled;
In conducting, control bus accesses direct current and is delivered to the power switch component of inverter;
Current buffering is controlled after the power-supplying circuit receives the Continuity signal preset duration that the main control chip is sent The buffer control circuit of component short circuit;
The current buffering component of current limliting is carried out to the direct current conveyed in the bus when not short-circuit;The power switch Component and the current buffering component are set in the bus of connection inverter, and the power-supplying circuit connection is described for establishing by cable Component is closed, is also used to connect the main control chip;The buffer control circuit connects the power-supplying circuit and the electric current Buffer Unit.
2. protection circuit of inverter according to claim 1, which is characterized in that the power-supplying circuit includes the first control After system switch, first resistor, second resistance, 3rd resistor and the 4th resistance, the first resistor and second resistance parallel connection One end connects the output end of first control switch, other end ground connection;Described in the input terminal connection of first control switch The control terminal of power switch component, first control switch connects the main control chip by the 4th resistance.
3. protection circuit of inverter according to claim 2, which is characterized in that the power switch component include first after Electric appliance, control coil one end of first relay connect the input terminal of first control switch, and the other end connects power supply Incoming end;The controlled switch of first relay is set on the firewire of the bus.
4. protection circuit of inverter according to claim 3, which is characterized in that the power switch component further includes first Capacitor and first diode, the first capacitor and the first diode with the control coil of first relay simultaneously Connection, and the anode of the first diode connects the public of the control coil of first relay and first control switch End.
5. protection circuit of inverter according to claim 1, which is characterized in that the buffer control circuit includes the second control Make switch, delay circuit, the 5th resistance and the 6th resistance, the delay circuit connect second control switch control terminal, The control terminal of the power-supplying circuit and the current buffering component, second control switch is connect by the 5th resistance The input terminal on ground, second control switch connects the current buffering component, second control by the 6th resistance The output end of switch is grounded.
6. protection circuit of inverter according to claim 5, which is characterized in that the delay circuit include the 7th resistance and Second capacitor, the 7th resistance is connected with second capacitor and common end connects the control terminal of second control switch, The other end of 7th resistance connects the power-supplying circuit and the current buffering component, second capacitor it is another End ground connection.
7. protection circuit of inverter according to claim 5, which is characterized in that the current buffering component include second after Electric appliance, current-limiting resistance, third capacitor and the 4th capacitor, the current-limiting resistance are set on the firewire of the bus, the third Capacitor and the 4th capacitor are connected between the firewire and zero curve of the bus;The control coil one of second relay End connects the delay circuit, and the control coil other end of second relay passes through the 6th resistance connection described second The controlled switch of the input terminal of control switch, second relay is in parallel with the current-limiting resistance.
8. a kind of servosystem, which is characterized in that including inverter, motor, main control chip and claim 1-7 any one institute The protection circuit of inverter stated, the main control chip connect the inverter and the power-supplying circuit, and the inverter connects The motor is connect, the power switch component and the current buffering component are set in the bus for connecting the inverter.
9. servosystem according to claim 8, which is characterized in that the inverter is three-phase bridge PWM inverter.
10. servosystem according to claim 8, which is characterized in that further include rectification circuit, the rectification circuit passes through The bus is connect with the inverter.
CN201821833327.7U 2018-11-07 2018-11-07 Protection circuit of inverter and servosystem Active CN208849663U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201821833327.7U CN208849663U (en) 2018-11-07 2018-11-07 Protection circuit of inverter and servosystem

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Application Number Priority Date Filing Date Title
CN201821833327.7U CN208849663U (en) 2018-11-07 2018-11-07 Protection circuit of inverter and servosystem

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109167512A (en) * 2018-11-07 2019-01-08 珠海格力电器股份有限公司 Protection circuit of inverter and servosystem

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109167512A (en) * 2018-11-07 2019-01-08 珠海格力电器股份有限公司 Protection circuit of inverter and servosystem

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