CN201724988U - Input phase failure detector for power unit of high-voltage frequency converter - Google Patents

Input phase failure detector for power unit of high-voltage frequency converter Download PDF

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Publication number
CN201724988U
CN201724988U CN2010202176778U CN201020217677U CN201724988U CN 201724988 U CN201724988 U CN 201724988U CN 2010202176778 U CN2010202176778 U CN 2010202176778U CN 201020217677 U CN201020217677 U CN 201020217677U CN 201724988 U CN201724988 U CN 201724988U
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China
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phase
voltage
circuit
tunnel
signal
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CN2010202176778U
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Chinese (zh)
Inventor
张昱科
杨培新
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襄樊大力电工有限公司
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Abstract

The utility model discloses an input phase failure detector for a power unit of a high-voltage frequency converter, which comprises a three-phase high-voltage input circuit, three paths of high-voltage input and voltage reduction output circuits, three paths of isolation conversion circuits, three paths of phase failure detection threshold value set circuits and a phase failure indication and output circuit. Three-phase high-voltage AC voltages are respectively input from the head ends of three paths of high-voltage capacitances which are connected in series and enter the three paths of isolation conversion circuits after being subjected to series connection and voltage division by the high-voltage capacitances; an AC voltage signal is isolated and converted into three paths of single-phase pulse waves to output by an optical coupler; then the three paths of single-phase pulse waves are sent to the post phase failure detection threshold value set circuits; and the phase failure detection threshold value set circuits compares and judges whether phase failure exists and then output phase failure signals or gates to the post phase failure indication and output circuit. The utility model has the advantages of high electrical isolation, no influence on cost and service life and simple realization of the circuits and provides the high-reliability input phase failure detector for the power unit of the high-voltage frequency converter.

Description

A kind of high voltage transducer power unit input phase loss detector
Technical field
The utility model belongs to power technique fields, is specifically related to a kind of high voltage transducer power unit input phase loss detector.
Background technology
At present, in the electric topological structure that adopts cell series multi-level converter, the all separate work of each power cell, after the phase-shifting transformer power taking through three phase full bridge rectification, filtering, low tension loop power work, cell controller operate as normal and with the master controller communication, carry out normal copped wave frequency conversion, the alternating current that output voltage, frequency, phase place are all adjustable according to the instruction of master controller again.In course of normal operation; cell controller needs the active detecting unit various faults that may occur in service;, unit excess temperature not normal etc. as power supply input side phase shortage, overvoltage, under-voltage, power device overcurrent, optical-fibre communications; must accurately make timely and judging and corresponding the processing; and report master controller; master controller is done further to judge and handle according to the information of fault; and send steering order and return to cell controller; allow the unit make relevant protection action, and demonstrate the processing that fault-signal prompting user does dependent failure.
When high voltage converter normally moves, if three-phase input open-phase fault appears in power cell, at first will influence the fluctuation of unit output power, secondly cause rectifier bridge to damage easily, cause the unit because of the dead electricity bypass then.Hence one can see that, can in time correct detection be very important for three-phase input open-phase fault.But detect owing to lack detection circuit relates to high pressure, high-low pressure altogether, the no center line of three-phase input, easily and multiple reason such as under-voltage fault erroneous judgement, thereby become one of technological difficulties in the cell failure detection.
One of existing detection method is to adopt three Industrial Frequency Transformers to isolate three-phase voltage respectively, the former limit star of three transformers connects or corner connection, the input voltage of former edge joint power cell, the inferior edge joint output rectification circuit of each transformer has or not phase shortage according to rectification, the judgement of filtered voltage swing.The advantage of this method is that the electrical isolation degree is higher, and is reliable, needs heavy Industrial Frequency Transformer but exist, and circuit complexity, response speed wait shortcoming slowly.
Two of existing detection method is to adopt the described circuit of utility model CN201331555, this circuit is converted to single-phase low-voltage output circuit with the three-phase alternating voltage of power cell by the high pressure input, intersect after the high-tension resistive step-down in twos, form three tunnel single-phase low-voltage ac voltage signal outputs, give three tunnel voltage stabilizings, rectification, filtering circuit respectively, ac voltage signal is converted to the input end that d. c. voltage signal is transported to optocoupler, optocoupler according to the size control output level of signal, flows to cell controller with the three-phase default phase signal again.The advantage of this method is not need heavy Industrial Frequency Transformer, and electrical isolation degree height has used multistage step-down, can be good at the high-voltage signal of decaying, and disturbs resistivity strong to high-frequency ac.Shortcoming one is that this circuit adopts high-tension resistive polyphone dividing potential drop, and the long-term heating of high-tension resistive causes the lost of life when the unit operate as normal, and price is more expensive, makes cost and life-span be greatly affected; The 2nd, this circuit adopts multistage step-down and back level to detect, and it is complicated to cause circuit to be realized.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, and a kind of Industrial Frequency Transformer that does not need heaviness that provides, electrical isolation degree height, cost and life-span are unaffected, and circuit is realized the simple high pressure transducer power unit input phase loss detector.
The utility model purpose is achieved in that a kind of high voltage transducer power unit input phase loss detector, the bag three-phase is drawn together the high pressure input circuit, three road high pressure input step-down output circuit, three the tunnel isolate change-over circuit, three tunnel phase shortage detection threshold initialization circuits and phase shortage indication and output circuit, each road that it is characterized in that three road high pressure input step-down output circuit is composed in series by at least two above high-voltage capacitances, the three-phase high-voltage alternating voltage is imported from three tunnel high-voltage capacitance head ends of series connection respectively, series connection dividing potential drop by high-voltage capacitance, three-phase voltage after the step-down enters three the tunnel and isolates change-over circuit, ac voltage signal is converted to three tunnel single-phase pulsating wave outputs through isolation, deliver to the phase shortage detection threshold initialization circuit of back level, relatively judge by phase shortage detection threshold initialization circuit to have or not phase shortage, again default phase signal or door output are delivered to back level signal indication and output circuit.
Described three tunnel each road that isolates change-over circuit are formed by an optocoupler, a fly-wheel diode and two resistance, negative pole concurrent via optocoupler is connected into star connection, the A of optocoupler, K end also connects the interchange fly-wheel diode, simultaneously with ac voltage signal via optocoupler isolate with voltage transitions be the outputs of three tunnel single-phase pulsating waves, deliver to the phase shortage detection threshold initialization circuit of back level.
Each road of described three tunnel phase shortage detection threshold initialization circuits is by a filter capacitor, a voltage stabilizing diode and anti-phase being composed in series of commutation diode; the ac voltage signal of three-phase low pressure is respectively through the filter capacitor voltage stabilizing; set the protection threshold values that phase shortage detects by the magnitude of voltage of selecting voltage stabilizing diode, the OR circuit of forming by three commutation diodes is delivered to back level phase shortage indication and output circuit with default phase signal again.
Indication of described phase shortage and output circuit are made up of two triodes, a light emitting diode, an optocoupler and two resistance, drive a LED light emitting diode indication non-full-phase state respectively simultaneously and an optocoupler is exported the normally-open normally-close signal by the default phase signal of the OR circuit output triode by two synchronization actions.
Compared with prior art, the utility model has the advantages that:
1, electrical isolation degree height, antijamming capability is strong.The utility model can be combined into circuit up to the 6KV isolation by the high-voltage capacitance of three series connection, and electric capacity can be good at the harmful effect of avoiding the DC component in the alternating current to cause every the straight-through characteristic of handing over.
Drawbacks such as 2, employing CBB type high-voltage capacitance step-down can be avoided the lost of life that the long-term heating of high-tension resistive causes when the unit operate as normal, and the high-tension resistive price is more expensive; And CBB type electric capacity has the characteristic of damaging that self-healing, overcurrent open circuit and long-term work are not generated heat etc. again, has improved the reliability of this high voltage transducer power unit input phase loss detector greatly.
3, circuit realizes that simply, components and parts use few, and cost is low.Adopt the capacitance resistance device purchased, make cost near minimum, the selection by the components and parts material is the reliability of control circuit to greatest extent.
Description of drawings
Fig. 1 is the utility model circuit block diagram.
Fig. 2 is the utility model circuit theory diagrams.
Embodiment
Following examples are further described the utility model in conjunction with the accompanying drawings.
See Fig. 1, Fig. 2, a kind of high voltage transducer power unit input phase loss detector comprises three-phase high-voltage input circuit, three road high pressure input step-down output circuit, three tunnel isolation change-over circuits, three tunnel phase shortage detection threshold initialization circuits and phase shortage indication and output circuit.Each road of three road high pressure input step-down output circuit is composed in series by at least two above high-voltage capacitances, the three-phase high-voltage alternating voltage is imported from three tunnel high-voltage capacitance head ends of series connection respectively, series connection dividing potential drop by high-voltage capacitance, three-phase voltage after the step-down enters three the tunnel and isolates change-over circuit, ac voltage signal is converted to three tunnel single-phase pulsating wave outputs through isolation, deliver to the phase shortage detection threshold initialization circuit of back level, compare by phase shortage detection threshold initialization circuit and to judge and to have or not phase shortage, again default phase signal or door output are delivered to back level signal indication and output circuit.
Each road of three road high pressure input step-down output circuit is composed in series by three CBB type 630V high-voltage capacitances (C1, C2, C3 or C4, C5, C6 or C7, C8, C9), the three-phase high-voltage alternating voltage is imported from the head end of each road high-voltage capacitance (C1, C2, C3 or C4, C5, C6 or C7, C8, C9) respectively by interface (JP1), by high-voltage capacitance (C1, C2, C3 or C4, C5, C6 or C7, C8, C9) series connection dividing potential drop, the three-phase voltage after the step-down is delivered to three the tunnel respectively and is isolated change-over circuit.
Three the tunnel isolate each road of change-over circuit by an optocoupler (U1 or U2 or U3), a fly-wheel diode ((D1 or D2 or D3)), an input resistance (R1 or R2 or R3) and a collector resistance (R11 or R12 or R13) are formed, negative pole concurrent via optocoupler (U1 or U2 or U3) is connected into star connection, the A of optocoupler (U1 or U2 or U3), the K end also connects interchange fly-wheel diode (D1 or D2 or D3), simultaneously with ac voltage signal via optocoupler (U1 or U2 or U3) isolate with voltage transitions be the outputs of three tunnel single-phase pulsating waves, deliver to three tunnel phase shortage detection threshold initialization circuits of back level respectively.
Each road of three tunnel phase shortage detection threshold initialization circuits is by a filter capacitor (C10 or C11 or C12), a voltage stabilizing diode (D4 or D5 or D6) and anti-phase being composed in series of a commutation diode (D7 or D8 or D9).The ac voltage signal of three-phase low pressure is respectively through filter capacitor (C10 or C11 or C12) voltage stabilizing; set the protection threshold values that phase shortage detects by the magnitude of voltage of selecting voltage stabilizing diode (D4 or D5 or D6), form by three commutation diodes (D7, D8, D9) again or goalkeeper's default phase signal deliver to back level phase shortage and indicate and output circuit.
Phase shortage indication and output circuit are made up of two triodes (V1, V2), a light emitting diode (D10), an optocoupler (U4) and two resistance (R8, R10), drive a LED light emitting diode (D10) indication non-full-phase state and an optocoupler (U4) output normally-open normally-close signal respectively simultaneously by the default phase signal of the OR circuit output triode (V1, V2) by two synchronization actions, the normally-open normally-close signal of optocoupler (U4) is exported by interface (JP2).
The course of work of the present utility model is as follows: three-phase alternating voltage R, the S of power cell, T import after high-voltage capacitance series connection step-down by high pressure, the asterism circuit of forming by optocoupler outputs to back level low pressure detection comparator circuit, control output indication and signal output apparatus state then with the three-phase voltage state isolation.When the power cell operate as normal, three-phase alternating voltage does not drop into 200V when following, through behind the reduction voltage circuit, d. c. voltage signal to the input end of optocoupler is enough to make the complete conducting of optocoupler, make three tunnel default phase signal all give the cell controller detection to set level, cell controller is not reported the phase shortage incident; Reach a input ac voltage more than mutually mutually and drop into 200V when following when power cell occurs one; through behind the reduction voltage circuit; the d. c. voltage signal of delivering to the input end of optocoupler will cause the incomplete conducting of optocoupler; make and have at least in three tunnel default phase signal one the tunnel to be the signal of setting level to be lower than; give one of cell controller by the output optocoupler and often open signal; cell controller is quoted the unit phase shortage according to this default phase signal again, holding circuit action then.
When the phase shortage accident occurs, the voltage of input all is very low, generally all in several volts, the voltage of high voltage transducer power unit phase loss detector of the present utility model about with 200V is standard, judge as whether phase shortage really occurring, can avoid the input voltage of three-phase alternating voltage fluctuation to occur or occur the possibility of wrong report when disturbing.

Claims (4)

1. high voltage transducer power unit input phase loss detector, comprise the three-phase high-voltage input circuit, three road high pressure input step-down output circuit, three the tunnel isolate change-over circuit, three tunnel phase shortage detection threshold initialization circuits and phase shortage indication and output circuit, each road that it is characterized in that three road high pressure input step-down output circuit is composed in series by at least two above high-voltage capacitances, the three-phase high-voltage alternating voltage is imported from three tunnel high-voltage capacitance head ends of series connection respectively, series connection dividing potential drop by high-voltage capacitance, three-phase voltage after the step-down enters three the tunnel and isolates change-over circuit, ac voltage signal is converted to three tunnel single-phase pulsating wave outputs through isolation, deliver to the phase shortage detection threshold initialization circuit of back level, relatively judge by phase shortage detection threshold initialization circuit to have or not phase shortage, again default phase signal or door output are delivered to back level signal indication and output circuit.
2. according to the said a kind of high voltage transducer power unit input phase loss detector of claim 1, it is characterized in that described three the tunnel isolate each road of change-over circuit by an optocoupler, a fly-wheel diode and two resistance compositions, negative pole concurrent via optocoupler is connected into star connection, the A of optocoupler, K end also connects the interchange fly-wheel diode, simultaneously ac voltage signal is isolated being converted to three tunnel single-phase pulsating wave outputs via optocoupler, deliver to the phase shortage detection threshold initialization circuit of back level.
3. according to the said a kind of high voltage transducer power unit input phase loss detector of claim 1; each road that it is characterized in that described three tunnel phase shortage detection threshold initialization circuits is by a filter capacitor, a voltage stabilizing diode and anti-phase being composed in series of commutation diode; the ac voltage signal of three-phase low pressure is respectively through the filter capacitor voltage stabilizing; set the protection threshold values that phase shortage detects by the magnitude of voltage of selecting voltage stabilizing diode, the OR circuit of forming by three commutation diodes is delivered to back level phase shortage indication and output circuit with default phase signal again.
4. according to the said a kind of high voltage transducer power unit input phase loss detector of claim 1, it is characterized in that indication of described phase shortage and output circuit be made up of two triodes, a light emitting diode, an optocoupler and two resistance, drive a LED light emitting diode indication non-full-phase state respectively simultaneously and an optocoupler is exported the normally-open normally-close signal by the default phase signal of the OR circuit output triode by two synchronization actions.
CN2010202176778U 2010-06-07 2010-06-07 Input phase failure detector for power unit of high-voltage frequency converter CN201724988U (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102438378A (en) * 2011-12-20 2012-05-02 江苏宏微科技有限公司 LED (Light Emitting Diode) illumination intelligent control system
CN102778612A (en) * 2011-05-13 2012-11-14 Ls产电株式会社 Apparatus for detecting input phase missing and method thereof
CN103746334A (en) * 2014-02-18 2014-04-23 常州江南电力环境工程有限公司 Electronic protection device for heater
CN103901285A (en) * 2014-02-27 2014-07-02 国电南京自动化股份有限公司 Method for detecting cascading type high-voltage inverter power unit input default phase
CN104977479A (en) * 2014-04-14 2015-10-14 艾默生环境优化技术有限公司 Three-phase power state detection device and method and motor system
CN105067884A (en) * 2015-08-25 2015-11-18 上海华兴数字科技有限公司 Three-phase alternating-current supply phase detection circuit
CN108196136A (en) * 2017-12-14 2018-06-22 青岛海信日立空调系统有限公司 A kind of three-phase electricity detection method and device and air-conditioner outdoor unit
US10116226B2 (en) 2013-12-25 2018-10-30 Abb Schweiz Ag Multi-phase electric drive and method therefor to provide power to a power unit
CN109406890A (en) * 2018-11-23 2019-03-01 深圳市汇川技术股份有限公司 Three-phase alternating current input phase failure detection method, system, equipment and storage medium

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102778612A (en) * 2011-05-13 2012-11-14 Ls产电株式会社 Apparatus for detecting input phase missing and method thereof
CN102438378A (en) * 2011-12-20 2012-05-02 江苏宏微科技有限公司 LED (Light Emitting Diode) illumination intelligent control system
CN102438378B (en) * 2011-12-20 2013-10-30 江苏宏微科技有限公司 LED (Light Emitting Diode) illumination intelligent control system
US10116226B2 (en) 2013-12-25 2018-10-30 Abb Schweiz Ag Multi-phase electric drive and method therefor to provide power to a power unit
CN103746334A (en) * 2014-02-18 2014-04-23 常州江南电力环境工程有限公司 Electronic protection device for heater
CN103901285A (en) * 2014-02-27 2014-07-02 国电南京自动化股份有限公司 Method for detecting cascading type high-voltage inverter power unit input default phase
CN103901285B (en) * 2014-02-27 2016-05-04 国电南京自动化股份有限公司 A kind of detection method of cascaded high-voltage frequency converter power cell input phase failure
CN104977479A (en) * 2014-04-14 2015-10-14 艾默生环境优化技术有限公司 Three-phase power state detection device and method and motor system
CN104977479B (en) * 2014-04-14 2018-04-06 艾默生环境优化技术有限公司 Three-phase electricity condition detection apparatus, method and electric system
CN105067884A (en) * 2015-08-25 2015-11-18 上海华兴数字科技有限公司 Three-phase alternating-current supply phase detection circuit
CN108196136A (en) * 2017-12-14 2018-06-22 青岛海信日立空调系统有限公司 A kind of three-phase electricity detection method and device and air-conditioner outdoor unit
CN108196136B (en) * 2017-12-14 2020-02-07 青岛海信日立空调系统有限公司 Three-phase electricity detection method and device and air conditioner outdoor unit
CN109406890A (en) * 2018-11-23 2019-03-01 深圳市汇川技术股份有限公司 Three-phase alternating current input phase failure detection method, system, equipment and storage medium

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ASS Succession or assignment of patent right

Owner name: DALI ELECTRIC XIANGYANG CO., LTD.

Free format text: FORMER OWNER: XIANGFAN BIG PAWER ELECTRIC ENGINEERING CO., LTD.

Effective date: 20120221

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Address after: 441003 Hubei high tech Zone in Xiangyang City, HangYu Road No. 5

Patentee after: Big Pawer Electrical Technology Xiangyang Co., Ltd.

Address before: 441003 Hubei high tech Zone in Xiangfan City, HangYu Road No. 5

Patentee before: Xiangfan Big Pawer Electrical Engineering Co., Ltd.

Effective date of registration: 20120221

Address after: 441003 Hubei high tech Zone in Xiangyang City, HangYu Road No. 5

Patentee after: Big Pawer Electrical Technology Xiangyang Co., Ltd.

Address before: 441003 Hubei high tech Zone in Xiangfan City, HangYu Road No. 5

Patentee before: Xiangfan Big Pawer Electrical Engineering Co., Ltd.

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CF01 Termination of patent right due to non-payment of annual fee