CN106712648A - Online fault rapid detection and bypass protecting method for high-voltage variable-frequency speed control system - Google Patents

Online fault rapid detection and bypass protecting method for high-voltage variable-frequency speed control system Download PDF

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Publication number
CN106712648A
CN106712648A CN201710133271.8A CN201710133271A CN106712648A CN 106712648 A CN106712648 A CN 106712648A CN 201710133271 A CN201710133271 A CN 201710133271A CN 106712648 A CN106712648 A CN 106712648A
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China
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circuit
igbt
high
connected
frequency
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CN201710133271.8A
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Chinese (zh)
Inventor
姜平
余维荣
黄小光
周根荣
杨慧
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南通大学
江苏力普电子科技有限公司
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Priority to CN201710133271.8A priority Critical patent/CN106712648A/en
Publication of CN106712648A publication Critical patent/CN106712648A/en

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02PCONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P27/00Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
    • H02P27/08Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
    • H02P27/14Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation with three or more levels of voltage
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02PCONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P2207/00Indexing scheme relating to controlling arrangements characterised by the type of motor
    • H02P2207/01Asynchronous machines

Abstract

The invention discloses an online fault rapid detection and bypass protecting method for a high-voltage variable-frequency speed control system. The high-voltage variable-frequency speed control system comprises a phase-shifting transformer, a frequency converter and a control unit, wherein the frequency converter comprises 27 same power units; each 9 power units are serially connected into one phase in turn; three phases are connected and then are connected with an asynchronous motor; each power unit comprises a rectifying circuit, an inverter circuit and a bypass protecting circuit which are connected with each other in turn; the rectifying circuit is arranged as a rectifying bridge circuit composed of a plurality of diodes and a capacitor; the inverter circuit is composed of a plurality of same IGBT units; the bypass protecting circuit is composed of a plurality of diodes, a bidirectional thyristor and a trigger circuit; and each IGBT unit comprises a driving circuit, an IGBT unit and a rapid detection circuit. According to the invention, the modular design is adopted; the interchangeability is excellent; the repairing is simple; the noise is low; the harmonic wave content is less; the torque ripple of the motor can be avoided; and the functions of online fault rapid detection and bypass protection can be realized.

Description

The online failure quick detection and bypass protection method of high-voltage variable-frequency and variable-speed system

Technical field

The invention belongs to High-voltage Frequency Conversion Technology field, and in particular to a kind of online failure of high-voltage variable-frequency and variable-speed system is quick Detection and bypass protection method.

Background technology

Promotion and China's high-tension motor capacity rapid growth with national energy-saving emission reduction policy, high voltage converter market The fast-developing phase is welcome.Frequency converter is installed between power supply and motor, is automatically adjusted by changing frequency and output voltage The speed of service of motor, is current so as to reach the purpose of the operational efficiency and using electricity wisely that improve user's electric motor system Most preferable, most promising motor energy-saving device.High voltage converter belongs to great electrical equipment, is the high, precision and frontier in frequency converter Product, is mainly used in the improvement of the driving of key equipment, the energy-saving run of high-voltage motor and processing performance, is widely used in electricity Power, metallurgy, petrochemical industry, locomotive traction etc..

The characteristics of variation of topological structure and control method is high voltage converter;In numerous topological structures, such as Friendship-ac frequency converter, GTO current source type variable frequencies device, three-level voltage source type frequency converter, the electricity of power device series connection direct voltage two All there is the deficiencies such as input side harmonic wave is big, output harmonic wave big and output voltage rate of change is high in level voltage source type frequency converter etc..With These topological structure inverters are compared, and cells cascaded multilevel inverter has that harmonic wave is small, common-mode voltage is small, voltage change ratio Small, electromagnetic interference is small, switching frequency is low, system effectiveness is high, be adapted to mesohigh large-capacity transducer application the features such as.Therefore, open Hair cells cascaded multilevel high-voltage AC motor frequency conversion speed-adjusting system and popularization and application, reducing per unit area yield energy consumption to China's industry has Important meaning, be also the applicant be devoted to always research direction.

The content of the invention

Goal of the invention:The invention aims to solve deficiency of the prior art, there is provided one kind is set using modularization Meter, interchangeability is good, easy to maintenance, and noise is low, and harmonic content is small, will not cause the torque pulsation of motor, and faulty online fast Speed detection and the high-voltage variable-frequency and variable-speed system and its online failure quick detection and bypass protection method of bypass protection function.

Technical scheme:The online failure quick detection and bypass protection of a kind of high-voltage variable-frequency and variable-speed system of the present invention Method, including online fault rapid detecting method and bypass protection method:

Online fault rapid detecting method:

(1)According to SPWM waveform requirements, IGBT drive circuit trigger signal is given by two CSTR controller;

(2)IGBT drive circuit receives after trigger signal conducting IGBT units immediately, and now IGBT units are for low tube voltage drop The forward conduction voltage of IGBT;

(3)While dsp controller sends drive signal, the output signal of dsp controller on-line real-time measuremen IGBT units GPIOB0, is normal non-fault if output signal GPIOB0 is high level, to have if output signal GPIOB0 is low level Failure;

Bypass protection method:

Once dsp controller on-line checking goes out GPIOB0 for low level, IGBT units break down, on the one hand no longer mono- to IGBT Unit's hair drives trigger signal;Trigger bidirectional thyristor KS at once simultaneously so that the SPWM of the superior and the subordinate's power cell of series connection with it Voltage can herein be presented short circuit and pass through;In order to be able to asynchronous machine three-phase voltage symmetrically works, simultaneously close off with the another two-phase power of group Unit.This method in quick detection with bypass processing procedure, do not shut down by system;

In normal work, the working frequency that foundation is set, DSP output drive signals, driving IGBT1, IGBT4 and IGBT2, IGBT3 alternations, obtain AC signal;DSP sends drive signal simultaneously at GPTOA mouthfuls, by GPTOB mouthfuls of DSP inputs Detect that whether corresponding IGBT turns on, if now IGBT is not turned on, explanation is out of order, 4 IGBT's of DSP one side blocks Drive signal, while DSP GPTOF mouthfuls of output signal triggering bidirectional thyristor conducting, realizes bypass protection.

Further, described high-voltage variable-frequency and variable-speed system, the system is arranged between three phase mains and asynchronous machine, should High-voltage variable-frequency and variable-speed system includes phase-shifting transformer, frequency converter and control unit, wherein:

Frequency converter, including 3n identical power cell, n >=2 and n are integer;It is followed in series to form per n power cell One phase, three-phase it is star-like be connected after connect the asynchronous machine;The power cell includes the rectification circuit, the inversion electricity that are sequentially connected Road and bypass protection circuit, the rectification circuit are the rectifier circuits being made up of multiple diodes and electric capacity, the inversion electricity Road is the inverter circuit being made up of multiple identical IGBT units, and the bypass protection circuit is by multiple diodes, two-way The circuit that IGCT and triggers circuit are constituted, the IGBT units include drive circuit, IGBT units and quick detection circuit;

Phase-shifting transformer, including primary side winding and 3n vice-side winding, primary side winding connect the three phase mains, and each is secondary Side winding connects a power cell according to extend-triangle connection;

Control unit, including two CSTR controller, PLC and man-machine interface, the two CSTR controller and each power Unit is electrically connected, and the man-machine interface is electrically connected with two CSTR controller, PLC respectively, the two CSTR controller Also electrically connected with the PLC.

Further, the n is 9.

Further, the triggers circuit is connected with the bidirectional thyristor, and the triggers circuit uses MOC3061 moulds Block, MOC3061 modules are photoelectric coupled device, and its input uses Phototube Coupling with output, realizes DSP signals to bidirectional thyristor Triggering control, the output signal GPIOF0 of two CSTR controller is connected with the defeated people of MOC3061 modules, MOC3061 modules it is defeated Go out and be connected with the input of bidirectional thyristor.

Further, the drive circuit uses Si8286 modules, drive control of the DSP signals to IGBT is realized, in it Using coupling isolation is held, transmission medium is SiO2 in portion, and high-speed digital signal is transmitted with capacitive form, and speed reaches 150Mbps, two CSTR Output signal GPIOA mouthfuls of controller is connected with the defeated people of Si8286 modules, Si8286 modules output and IGBT input phase Even.

Further, the quick detection circuit includes diode VD1, diode VD2, resistance R1, resistance R2 and optocoupler Clutch part OC, the diode in the LMDS Light Coupled Device is in parallel with the diode VD2 after being connected with resistance R1, diode VD1 Connection, the colelctor electrode of the phototriode in the LMDS Light Coupled Device is connected with resistance R2.

Beneficial effect:The present invention uses modularized design, and interchangeability is good, easy to maintenance, and noise is low, and harmonic content is small, no The torque pulsation of motor, and faulty on-line quick detection and bypass protection function can be caused.

Brief description of the drawings

Fig. 1 is overall structure diagram of the invention;

Fig. 2 is single power cell structure schematic diagram of the invention;

Fig. 3 is single IGBT cellular construction schematic diagrams of the invention.

Specific embodiment

In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and It is not used in the restriction present invention.

A kind of high-voltage variable-frequency and variable-speed system with online failure quick detection and bypass protection as shown in Figure 1, this is System is arranged between three phase mains and asynchronous machine, and the high-voltage variable-frequency and variable-speed system includes phase-shifting transformer, frequency converter and control Unit processed, wherein:

Frequency converter, including 27 identical power cells(A1-A9, B1-B9, C1-C9);Every 9 power cells are sequentially connected in series structure Cheng Yixiang, three-phase it is star-like be connected after connect the asynchronous machine.

As shown in Fig. 2 the power cell includes the rectification circuit, inverter circuit and the bypass protection circuit that are sequentially connected, The rectification circuit is the rectifier circuit being made up of six diode D1-D6 and electric capacity C, and the inverter circuit is by four phases The inverter circuit that same IGBT units are constituted, the bypass protection circuit is by four diode D7-D10, bidirectional thyristors The circuit that KS and triggers circuit are constituted.

The triggers circuit is connected with the bidirectional thyristor, and the triggers circuit uses MOC3061 modules, MOC3061 Module is photoelectric coupled device, and its input uses Phototube Coupling with output.Realize triggering control of the DSP signals to bidirectional thyristor System.The output signal GPIOF0 of DSP is connected with the defeated people of MOC3061 modules, output and the bidirectional thyristor of MOC3061 modules Input is connected.Further, the drive circuit is connected with the base stage of the IGBT units, the colelctor electrode of the IGBT units with Quick detection circuit is provided between emitter stage.

As shown in figure 3, the IGBT units include drive circuit, IGBT units and quick detection circuit;It is described to drive electricity Road is connected with the base stage of the IGBT units, and quick detection circuit is provided between the colelctor electrode and emitter stage of the IGBT units. The quick detection circuit includes diode VD1, diode VD2, resistance R1, resistance R2 and LMDS Light Coupled Device OC, the optocoupler Diode in clutch part is connected in parallel after being connected with resistance R1, diode VD1 with the diode VD2, the photo-coupler The colelctor electrode of the phototriode in part is connected with resistance R2.

The drive circuit uses Si8286 modules, realizes drive control of the DSP signals to IGBT.Here select Silicon Labs companies intelligence gate-drive Si8286 modules, with spies such as high withstand voltage, low conduction impedance, senior engineer's working frequencies Levy.It is internal using coupling isolation is held, and transmission medium is SiO2, and high-speed digital signal is transmitted with capacitive form, and speed is reachable 150Mbps.Si8286 modules, built-in IGBT detections and defencive function.The output signal of DSP(GPIOA mouthfuls)With Si8286 modules Defeated people be connected, the output of Si8286 modules is connected with the input of IGBT.

Phase-shifting transformer, including primary side winding and 27 vice-side windings, primary side winding connect the three phase mains, each Vice-side winding connects a power cell according to extend-triangle connection.

Control unit, including two CSTR controller, PLC and man-machine interface, the two CSTR controller and each Power cell is electrically connected, and the man-machine interface is electrically connected with two CSTR controller, PLC respectively, the two CSTR control Device processed is also electrically connected with the PLC.

High-voltage variable-frequency and variable-speed system of the invention with high-speed dsp as control core, using space voltage vector control technology, Power unit cascade multilevel converter;System uses New IGBT power device, the control of totally digitilized microcomputer, directly export 3KV, The high voltage power supply of 6KV, 10KV, is adapted to various general three-phase alternating-current motors.

Many level carrier phase shift technologies that the inverter output of power cell is controlled using SPWM, the power cell of same phase Certain electrical angle that is mutually staggered between the fundamental voltage of identical amplitude and phase, but the carrier wave of series connection each unit is exported, is realized Many level PWMs, output voltage closely sine wave, each level step only has unit DC bus-bar voltage size, output wave Form quality amount is good, and output voltage relative harmonic content is less than 1.8%, the additional heating of the motor caused in the absence of harmonic wave and torque pulsation, The problems such as noise, output dv/dt, common-mode voltage, it is not necessary to plus output filter, it is possible to use common asynchronous machine.

Frequency converter per being composed in series using low pressure and low power unit, every 9 power cells of phase, three-phase totally 27 it is identical Power cell.Using modularized design, interchangeability is good, easy to maintenance, and noise is low, and harmonic content is small, will not cause motor Torque pulsation, does not have particular/special requirement to motor.

Power cell is the important core part of high voltage converter.It is completely the same in each power cell structure, can be mutual Change(Shown in power cell schematic diagram 2), system is basic AC-DC-AC single-phase inversion circuit, and power cell uses three-phase alternating current Input, diode three phase full bridge rectification, the SPWM voltages of output single-phase after IGBT inversions, and faulty online quick inspection Survey and bypass protection function.

The ceiling voltage that IGBT device is born in power cell is DC bus-bar voltage in unit, can directly use low pressure Power device, device need not connect, in the absence of the voltage-sharing that devices in series causes, and the low pressure used in power cell IGBT/1700V power models, drive circuit is simple, and technology maturation reliability, device is operated in low-pressure state, is not susceptible to failure.

Operation principle of the invention is as follows:

Three-phase alternating voltage turns into DC voltage through D1 ~ D6 rectifier bridges, then turns into after the inversion of IGBT 1 ~ IGBT of unit units 4 SPWM single-phase AC voltages, the frequency of its SPWM signal has the drive circuit of IGBT units(Fig. 3)Triggering frequency determine.Power Cell failure occurs mainly in the IGBT cell failures of Converting Unit, once IGBT cell failures(IGBT device is bad or drives electricity Road failure)Inversion cannot be realized.

Power cell fault on-line quick detection method is as follows:

According to SPWM waveform requirements, the trigger signal of IGBT drive circuit is given, IGBT is turned on immediately, and is low tube voltage drop (The forward conduction voltage of IGBT), DSP sending drive signal(GPTOA mouthfuls)Meanwhile, by DSP inputs(GPTOB mouthfuls)Inspection Survey corresponding IGBT whether to turn on, if GPTOB mouthfuls is high level, belong to normal non-fault.Inversion output single-phase alternating voltage, with it The single-phase AC voltage of his serial unit is superimposed to form high pressure SPWM waveform voltages.If IGBT units are out of order, give The trigger signal of IGBT drive circuit, IGBT would not be turned on, and the tube voltage drop of IGBT still maintains high voltage, and IGBT is sent in DSP During drive circuit trigger signal, the signal that GPTOB mouthfuls of on-line real-time measuremen circuit is now low electricity because optocoupler turns on GPTOB mouthfuls It is flat, belong to failure.Once IGBT cell failures, real-time online detection is quick to be found.As long as having an IGBT cell failure, power list Unit cannot just export SPWM ripples.

The guard method of bypass circuit is as follows:

On the one hand no longer to 4 IGBT Dan Wufa trigger signals;Meanwhile, bidirectional thyristor KS is triggered at once so that series connection with it The superior and the subordinate's power cell SPWM voltages, short circuit can be herein presented and pass through.In order to be able to asynchronous machine three-phase voltage symmetrically works, Simultaneously close off with the another two-phase power cell of group(Also it is processed as bypass).This failure, quick detection is processed with bypass, system Do not shut down.

In normal work, the working frequency that foundation is set, DSP output drive signals, driving IGBT1, IGBT4 and IGBT2, IGBT3 alternations, obtain AC signal;DSP sends drive signal simultaneously at GPTOA mouthfuls, by GPTOB mouthfuls of DSP inputs Detect that whether corresponding IGBT turns on, if now IGBT is not turned on, explanation is out of order, 4 IGBT's of DSP one side blocks Drive signal, while DSP GPTOF mouthfuls of output signal triggering bidirectional thyristor conducting, realizes bypass protection.

The above, is only presently preferred embodiments of the present invention, and any formal limitation is not made to the present invention, though So the present invention is disclosed above with preferred embodiment, but is not limited to the present invention, any to be familiar with this professional technology people Member, without departing from the scope of the present invention, when making a little change or modification using the technology contents of the disclosure above It is the Equivalent embodiments of equivalent variations, as long as being the content without departing from technical solution of the present invention, according to technical spirit of the invention Any simple modification, equivalent variations and the modification made to above example, still fall within the range of technical solution of the present invention.

Claims (7)

1. the online failure quick detection and bypass protection method of a kind of high-voltage variable-frequency and variable-speed system, it is characterised in that:It is included in Line fault rapid detecting method and bypass protection method:
Online fault rapid detecting method:
(1)According to SPWM waveform requirements, IGBT drive circuit trigger signal is given by two CSTR controller;
(2)IGBT drive circuit receives after trigger signal conducting IGBT units immediately, and now IGBT units are for low tube voltage drop The forward conduction voltage of IGBT;
(3)While dsp controller sends drive signal, the output signal of dsp controller on-line real-time measuremen IGBT units GPIOB0, is normal non-fault if output signal GPIOB0 is high level, to have if output signal GPIOB0 is low level Failure;
Bypass protection method:
Once dsp controller on-line checking goes out GPIOB0 for low level, IGBT units break down, on the one hand no longer mono- to IGBT Unit's hair drives trigger signal;Trigger bidirectional thyristor KS at once simultaneously so that the SPWM of the superior and the subordinate's power cell of series connection with it Voltage can herein be presented short circuit and pass through;In order to be able to asynchronous machine three-phase voltage symmetrically works, simultaneously close off with the another two-phase power of group Unit.This method in quick detection with bypass processing procedure, do not shut down by system;
In normal work, the working frequency that foundation is set, DSP output drive signals, driving IGBT1, IGBT4 and IGBT2, IGBT3 alternations, obtain AC signal;DSP sends drive signal simultaneously at GPTOA mouthfuls, by GPTOB mouthfuls of DSP inputs Detect that whether corresponding IGBT turns on, if now IGBT is not turned on, explanation is out of order, 4 IGBT's of DSP one side blocks Drive signal, while DSP GPTOF mouthfuls of output signal triggering bidirectional thyristor conducting, realizes bypass protection.
2. a kind of online failure quick detection of high-voltage variable-frequency and variable-speed system according to claim 1 and bypass protection side Method, it is characterised in that:The high-voltage variable-frequency and variable-speed system is arranged between three phase mains and asynchronous machine, the high-voltage frequency conversion and speed-adjusting System includes phase-shifting transformer, frequency converter and control unit, wherein:
Frequency converter, including 3n identical power cell, n >=2 and n are integer;It is followed in series to form per n power cell One phase, three-phase it is star-like be connected after connect the asynchronous machine;The power cell includes the rectification circuit, the inversion electricity that are sequentially connected Road and bypass protection circuit, the rectification circuit are the rectifier circuits being made up of multiple diodes and electric capacity, the inversion electricity Road is the inverter circuit being made up of multiple identical IGBT units, and the bypass protection circuit is by multiple diodes, two-way The circuit that IGCT and triggers circuit are constituted, the IGBT units include drive circuit, IGBT units and quick detection circuit;
Phase-shifting transformer, including primary side winding and 3n vice-side winding, primary side winding connect the three phase mains, and each is secondary Side winding connects a power cell according to extend-triangle connection;
Control unit, including two CSTR controller, PLC and man-machine interface, the two CSTR controller and each power The IGBT units of unit are electrically connected, and the man-machine interface is electrically connected with two CSTR controller, PLC respectively, described double Dsp controller is also electrically connected with the PLC.
3. a kind of online failure quick detection of high-voltage variable-frequency and variable-speed system according to claim 2 and bypass protection side Method, it is characterised in that:The n is 9.
4. a kind of online failure quick detection of high-voltage variable-frequency and variable-speed system according to claim 2 and bypass protection side Method, it is characterised in that:The triggers circuit is connected with the bidirectional thyristor, and the triggers circuit uses MOC3061 modules, MOC3061 modules are photoelectric coupled device, and its input uses Phototube Coupling with output, realizes DSP signals to bidirectional thyristor Triggering control, the output signal GPIOF0 of two CSTR controller is connected with the defeated people of MOC3061 modules, the output of MOC3061 modules It is connected with the input of bidirectional thyristor.
5. a kind of online failure quick detection of high-voltage variable-frequency and variable-speed system according to claim 2 and bypass protection side Method, it is characterised in that:The drive circuit is connected with the grid of the IGBT units, colelctor electrode and the transmitting of the IGBT units Quick detection circuit is provided between pole.
6. the online failure quick detection and bypass protection of a kind of high-voltage variable-frequency and variable-speed system according to claim 2 or 5 Method, it is characterised in that:The drive circuit uses Si8286 modules, drive control of the DSP signals to IGBT is realized, inside it Isolated using coupling is held, transmission medium is SiO2, high-speed digital signal is transmitted with capacitive form, speed reaches 150Mbps, two CSTR control Output signal GPIOA mouthfuls of device processed is connected with the defeated people of Si8286 modules, and the output of Si8286 modules is connected with the input of IGBT.
7. the online failure quick detection and bypass protection of a kind of high-voltage variable-frequency and variable-speed system according to claim 2 or 5 Method, it is characterised in that:The quick detection circuit includes diode VD1, diode VD2, resistance R1, resistance R2 and optical coupling Device OC, the diode in the LMDS Light Coupled Device is in parallel with the diode VD2 after being connected with resistance R1, diode VD1 to be connected Connect, the colelctor electrode of the phototriode in the LMDS Light Coupled Device is connected with resistance R2.
CN201710133271.8A 2017-03-08 2017-03-08 Online fault rapid detection and bypass protecting method for high-voltage variable-frequency speed control system CN106712648A (en)

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CN202978689U (en) * 2012-12-07 2013-06-05 上海亿思特电气股份有限公司 Bypass apparatus for power unit of high-voltage frequency converter
CN203027114U (en) * 2012-12-10 2013-06-26 北京利德华福电气技术有限公司 Cascading middle-voltage frequency inverter
CN103336235A (en) * 2013-06-13 2013-10-02 广东明阳龙源电力电子有限公司 IGBT condition detection circuit
CN103795323A (en) * 2012-11-02 2014-05-14 上海电气集团股份有限公司 High-voltage frequency-conversion speed-regulation system and control method thereof
CN205193194U (en) * 2015-11-05 2016-04-27 许继电源有限公司 Novel electronic switch short circuit detects device

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002040068A (en) * 2000-07-27 2002-02-06 Nec Corp Intermodulation distortion measuring device
CN201226505Y (en) * 2008-04-30 2009-04-22 黄邦洪 High voltage blower/high voltage fan electricity-saving device
CN101793938A (en) * 2010-03-30 2010-08-04 哈尔滨工业大学 On-line detection device and detection method for open-circuit fault of power tubes of inverter
CN103107689A (en) * 2011-11-11 2013-05-15 台达电子企业管理(上海)有限公司 Cascading transducer and power unit and bypass module of power unit
CN103795323A (en) * 2012-11-02 2014-05-14 上海电气集团股份有限公司 High-voltage frequency-conversion speed-regulation system and control method thereof
CN202978689U (en) * 2012-12-07 2013-06-05 上海亿思特电气股份有限公司 Bypass apparatus for power unit of high-voltage frequency converter
CN203027114U (en) * 2012-12-10 2013-06-26 北京利德华福电气技术有限公司 Cascading middle-voltage frequency inverter
CN103336235A (en) * 2013-06-13 2013-10-02 广东明阳龙源电力电子有限公司 IGBT condition detection circuit
CN205193194U (en) * 2015-11-05 2016-04-27 许继电源有限公司 Novel electronic switch short circuit detects device

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