CN203660511U - Overcurrent protective device of frequency converter - Google Patents

Overcurrent protective device of frequency converter Download PDF

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Publication number
CN203660511U
CN203660511U CN201420002392.0U CN201420002392U CN203660511U CN 203660511 U CN203660511 U CN 203660511U CN 201420002392 U CN201420002392 U CN 201420002392U CN 203660511 U CN203660511 U CN 203660511U
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current
frequency converter
comparison
circuit
module
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徐云龙
李瑞英
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Hiconics Eco Energy Technology Co Ltd
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BEIJING HICONICS DRIVE TECHNOLOGY CO LTD
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Abstract

The utility model provides an overcurrent protective device of a frequency converter. The overcurrent protective device of the frequency converter is characterized in that two primary windings of a current transformer 1 are in series connection with an A-phase input loop and a C-phase input loop of power units respectively, and the secondary windings 1a and 1b are connected with a current acquisition processing plate 2 separately; a sampling module 2a in the current acquisition processing plate 2 samples the A-phase and C-phase input currents of the power unit via the current transformer 1 (1a, 1c), and calculates a B-phase input current according to the A-phase and C-phase input currents; a signal processing module 2b applies different current threshold values to the power units of different working stages according to an operation signal of the frequency converter, thereby judging an overcurrent. When the overcurrent exists, a high voltage breaker 4 in the input loop of a phase-shifting transformer YB is controlled to cut off, thereby stopping supplying power to the power units.

Description

The overcurrent protective device of frequency converter
Technical field
The utility model relates to the overcurrent protective device of frequency converter.
Background technology
Frequency converter in use, because some faults can cause the overcurrent of power cell, in order to protect power cell, need to be taked certain overcurrent protection measure, normally protects with fuse.But by a drawback of fuse protection existence, because power cell impulse current in the time powering on (has starting resistance can reach the rated current of 5 times very greatly; Can reach the rated current of 10 times without starting resistance); the misoperation that impulse current causes when powering on; the type selecting (blowout current) of fuse often needs bigger than normal, and in running, needs the current value of protecting often to only have 2 times with interior rated current.So just there is a contradiction, the blowout current of fuse is selected little, in the time that frequency converter powers on, is easily produced misoperation by impulse current fusing; The blowout current of fuse is selected large, though can avoid being fused by impulse current in the time that frequency converter powers on, in the time of operation, cannot effectively protect power cell, easily causes larger economic loss.
Addressing this problem more conventional method is, add a starting resistance in input power side, in the time starting, starting resistance is connected in series to input side, after busbar voltage is stable, by switch, starting resistance is removed, though this method limiting starting current to a certain extent, avoid fuse to be fused by impulse current, but complex structure, and starting current will be limited in 2 times of rated current, the resistance and the power that need are all very large, can not tackle the problem at its root.And fuse belongs to disposable device, the price of itself is more expensive again, and use cost is also higher.
Utility model content
The purpose of this utility model is to provide a kind of overcurrent protective device of frequency converter, has simple in structurely, and good economy performance not only can be avoided the misoperation that causes because of impulse current in the time that power cell powers on, and can also in the time of overcurrent, effectively protect power cell.
For achieving the above object, the utility model adopts following technical scheme:
The first technical scheme is a kind of overcurrent protective device of frequency converter, it is characterized in that,
Comprise,
Current sample module, the input current by it to power cell is sampled,
Rectification module, is rectified into sample rate current or sampled voltage by it detected value of direct current,
The first comparison module, is compared described detected value and the first comparison value by it, in the time that detected value is greater than the first comparison value, and output overcurrent signal, starting current when the first comparison value powers on according to power cell is set,
The second comparison module, is compared described detected value and the second comparison value by it, in the time that detected value is greater than the second comparison value, and output overcurrent signal, the second comparison value is set according to the maximum operating currenbt of power cell,
Relatively channel selecting module, it selects the second comparison module to compare according to the run signal of frequency converter in the time having run signal input, selects the first comparison module to compare while thering is no run signal,
Breaker controller, it controls the circuit breaker of frequency converter or power cell according to the overcurrent signal of the selected first or second comparison module output, cuts off the power supply to power cell.
The second technical scheme is to form on the basis of the first technical scheme, it is characterized in that,
Also comprise current transformer, a winding of current transformer is serially connected in the input circuit of power cell, and described current sample module is sampled to the input current of power cell by secondary winding.
The 3rd technical scheme is to form on the basis of the second technical scheme, it is characterized in that,
Described current transformer is biphase current instrument transformer, and described current sample module is sampled to the two-phase input current of power cell by biphase current instrument transformer, calculates the sample rate current of third phase input current according to sample rate current.
The 4th technical scheme is to form on the basis of the 3rd technical scheme, it is characterized in that,
Between described current transformer and described current sample module, be provided with voltage follower.
The 5th technical scheme is to form on the basis of the 4th technical scheme, it is characterized in that,
Described the first comparison module is made up of operational amplification circuit and comparator, described the second comparison module is made up of operational amplification circuit and comparator, starting current when the setting comparison value of the comparator of described the first comparison module powers on according to power cell is set, and the setting comparison value of the comparator of described the second comparison module is set according to the maximum operating currenbt of power cell.
The 6th technical scheme is to form on the basis of the 5th technical scheme, it is characterized in that, described the first comparison module is connected with described relatively channel selecting module by photoelectric coupled circuit with the second comparison module.
The 7th technical scheme is to form on the basis of the 6th technical scheme, it is characterized in that,
Described relatively channel selecting module comprises with frequency converter controller and being connected, for receiving the port circuit of run signal, three inverters, two AND circuit, an OR circuit, the input of the first inverter is connected with the first comparison module by photoelectric coupled circuit, the input of the second inverter is connected with the second comparison module by photoelectric coupled circuit, the output of the first inverter is connected with an input of the first AND circuit, the output of the second inverter is connected with an input of the second AND circuit, port circuit is connected with another input of the second AND circuit, and be connected with another input of the first AND circuit by the 3rd inverter, the first AND circuit, the output of the second AND circuit is connected with two inputs of OR circuit respectively, the output of OR circuit is connected with breaker controller.
The 8th technical scheme is to form on the basis of the technical scheme of any one in first to seven, it is characterized in that,
Described frequency converter is tandem type high voltage converter, and described circuit breaker is arranged on output or the input circuit of phase shifting transformer, and described breaker controller is arranged in frequency converter controller.
The beneficial effects of the utility model are: two relatively passages are set, starting current when one relatively the comparison value of passage powers on according to power cell is set, another maximum output current when relatively the comparison value of passage is according to operation is set, select the output signal of different comparison passages in the different phase of power cell, judge the overcurrent of power cell, in the time of overcurrent, control circuit breaker, cut off the power supply to power cell or frequency converter.
Therefore, the misoperation that causes because of impulse current not only can be in the time that power cell powers on, avoided, power cell can also be in the time of overcurrent, effectively protected.And than the structure that disposable fuse and starting resistance are set, also have simple in structure, the feature of good economy performance.
Accompanying drawing explanation
Fig. 1 is the topological diagram of high pressure tandem type frequency converter;
Fig. 2 is the circuit diagram of the power cell in high pressure tandem type frequency converter;
Fig. 3 is the block diagram of the embodiment of overcurrent protective device of the present utility model.
Fig. 4 be in current acquisition disposable plates current sample to the block diagram of overcurrent signal generating portion;
Fig. 5 is that overcurrent signal is selected logic diagram.
Embodiment
Fig. 1 is the topological diagram of high pressure tandem type frequency converter, comprises phase shifting transformer YB and multiple power cell of being powered by phase shifting transformer YB.Fig. 2 is the circuit diagram of power cell.Each phase (A, B, C) of frequency converter is in series by 5 identical power cells (A1~A5, B1~B5, C1~C5), each mutually in the output voltage stack of each power cell and the phase voltage that forms high pressure to load supplying.Each power cell is by not shown frequency converter controller control.
Primary cut-out K is installed in the input circuit of phase shifting transformer YB, can cuts off the power supply to all power cells by controlling primary cut-out K.
The embodiment of the overcurrent protective device of during below to power cell overcurrent, it being protected describes.
Fig. 3 is the block diagram of the embodiment of overcurrent protective device of the present utility model.In Fig. 3, two windings of current transformer 1 are connected on respectively in the A phase, C phase input circuit of power cell shown in Fig. 2, secondary winding 1a, 1b are connected respectively to current acquisition disposable plates 2, A phase, C phase input current by the sampling module 2a in current acquisition disposable plates 2 to power cell are sampled, and by calculating B phase input current.Signal processing module 2b in current acquisition disposable plates 2 according to the A phase of power cell, B phase, C phase input current by with current threshold relatively judge power cell overcurrent.This comparison passage is provided with two, input current when one relatively the current threshold in passage starts corresponding to frequency converter, and relatively the maximum input current of the circuit threshold value in passage when normally moving is corresponding for another.Current acquisition disposable plates 2 is connected with frequency converter controller 3 by port 2c, run signal when frequency converter normally moves is input to current acquisition disposable plates 2 by port 2c, signal processing module 2b is according to defeated the having or not of run signal, be suitable for different comparison passages and judge overcurrent, in the time having overcurrent, overcurrent signal is input to frequency converter controller 3 by port 2c.Frequency converter controller 3, according to overcurrent signal, is controlled the primary cut-out K in the primary cut-out 4(Fig. 1 being arranged in phase shifting transformer YB input circuit) disconnect, stop the power supply to power cell.
Fig. 4 be in current acquisition disposable plates current sample to the block diagram of overcurrent signal generating portion.A phase current sampling part 21a, C phase current sampling part 21c adopt respectively accurate sampling resistor, sampling resistor is attempted by the secondary winding 1a of current transformer 1, the two ends of 1b, the current conversion that A phase current mutual inductor, B phase current mutual inductor secondary side induce becomes voltage, sampled voltage is exported by voltage follower 22a, 22c, makes sampled voltage not be subject to the impact of subsequent conditioning circuit.Due to three-phase input current three-phase symmetrical, just can be by calculating third phase input current by two-phase input current.Calculating B phase current circuit 22b is for example subtraction circuit, and the A, the C phase input current that obtain according to sampling, calculate B phase input current.
A, B, C three-phase input current obtain six interlaced peak values of three-phase current by precise rectification circuit 23 rectifications, then, after being amplified by K1 times of operational amplification circuit 24a and K2 times of operational amplification circuit 24b, compare at comparator 25a, 25b and a reference source (setting comparison value).When a reference source is for example 3V, K1 times of operational amplification circuit 24a sampled voltage corresponding to current threshold (maximum current) when normally moving with frequency converter is amplified to 3V, and K2 times of operational amplification circuit 24b sampled voltage corresponding to current threshold (maximum current) when with frequency converter electrifying startup is amplified to 3V.Through the comparison of comparator 25a, 25b and 3V a reference source, obtain pulse signal, that is, when input current is greater than current threshold, comparator 25a, 25b export overcurrent signal.
Fig. 5 is that overcurrent signal is selected logic diagram, and the selection of overcurrent signal can utilize FPGA(field programmable gate array) realize.Its logic is, the input of the first inverter 28a is connected with comparator 25a by photoelectric coupled circuit 26a, the input of the second inverter 28b is connected with comparator 25b by photoelectric coupled circuit 26b, the output of the first inverter 28a is connected with an input of the first AND circuit 30a, the output of the second inverter 28b is connected with an input of the second AND circuit 30b, be connected with frequency converter controller 3, the port circuit 27 of input run signal is connected with another input of the second AND circuit 30b, and be connected with another input of the first AND circuit 30a by the 3rd inverter 29a, the first AND circuit 30a, the output of the second AND circuit 30b is connected with two inputs of OR circuit 31 respectively, the output of OR circuit 31 is connected by the port circuit 2c shown in Fig. 3 and frequency converter controller 3.
Therefore, normally move at frequency converter, while having run signal input, select the overcurrent signal output of comparator 25a; Frequency converter electrifying startup, while thering is no run signal input, selects the overcurrent signal output of comparator 25b.Overcurrent signal is input to frequency converter controller 3 by port 2c as shown in Figure 3, just can make to be arranged on the K in the primary cut-out 4(Fig. 1 in phase shifting transformer YB input circuit by the control of frequency converter controller 3) disconnect, protection is to power cell.
As mentioned above; in the utility model; input current due to can be to the normal operation of frequency converter and electrifying startup time arranges respectively different current thresholds; judge the overcurrent of power cell; not only can in the time that powering on, power cell avoid the misoperation causing because of impulse current; no matter frequency converter, in the time that normal operating condition or electrifying startup state can be in power cell overcurrent, cuts off power supply protection power cell.
Therefore with existing technology comparison, the utlity model has following advantage.
1, compared with protecting with traditional fuse, utilize this device can realize the flexible setting of the protection value to the different operation phase of frequency converter, flexible setting for parameters (change K1 times of operational amplification circuit 24a, a reference source voltage of the amplification quantity of K2 times of operational amplification circuit 24b and comparator 25a, 25b can change current protection value);
2, because fuse price is higher, remove fuse, utilize this device, can improve economical; And fuse volume is larger, utilizes this device, can be also that the structure of whole frequency converter is compacter.
The above; it is only embodiment of the present utility model; but protection range of the present utility model is not limited to this; any be familiar with those skilled in the art the utility model disclose technical scope in; it can carry out various replacements and change, within all should be encompassed in protection range of the present utility model.As embodiment mesohigh circuit breaker, K is arranged in the input circuit of phase shifting transformer YB, but the output loop of phase shifting transformer YB also can be set, in the input circuit of each power cell, to the independent cut-out power supply of the power cell of overcurrent.Also can not utilize frequency converter controller to carry out to the control of primary cut-out 4, and breaker controller is set in addition; The a reference source of comparator 25a, 25b also can be arranged to different voltage; Applicable frequency converter is also not limited to high pressure tandem type frequency converter, as long as other have while normally operation, and any frequency converter of run signal output is all suitable for.
Therefore, protection range of the present utility model should described be as the criterion with the protection range of claim.

Claims (8)

1.一种变频器的过电流保护装置,其特征在于,1. An overcurrent protection device for a frequency converter, characterized in that, 包括,include, 电流采样模块,由其对功率单元的输入电流进行采样,a current sampling module, which samples the input current of the power unit, 整流模块,由其将采样电流或采样电压整流成直流的检测值,a rectification module, which rectifies the sampled current or sampled voltage into a DC detection value, 第一比较模块,由其将所述检测值与第一比较值进行比较,在检测值大于第一比较值时,输出过电流信号,第一比较值根据功率单元上电时的启动电流设定,The first comparison module is used to compare the detection value with a first comparison value, and output an overcurrent signal when the detection value is greater than the first comparison value, and the first comparison value is set according to the starting current when the power unit is powered on , 第二比较模块,由其将所述检测值与第二比较值进行比较,在检测值大于第二比较值时,输出过电流信号,第二比较值根据功率单元的最大工作电流设定,A second comparison module, which compares the detection value with a second comparison value, and outputs an overcurrent signal when the detection value is greater than the second comparison value, and the second comparison value is set according to the maximum operating current of the power unit, 比较通道选择模块,其根据变频器的运行信号,在有运行信号输入时选择第二比较模块进行比较,没有运行信号时选择第一比较模块进行比较,A comparison channel selection module, which selects the second comparison module for comparison when there is an operation signal input according to the operation signal of the frequency converter, and selects the first comparison module for comparison when there is no operation signal, 断路器控制器,其根据所选择的第一或第二比较模块输出的过电流信号,控制变频器或功率单元的断路器,切断对功率单元的供电。The circuit breaker controller controls the circuit breaker of the frequency converter or the power unit according to the overcurrent signal output by the selected first or second comparison module, and cuts off the power supply to the power unit. 2.根据权利要求1所述的变频器的过电流保护装置,其特征在于,2. The overcurrent protection device of the frequency converter according to claim 1, characterized in that, 还包括电流互感器,电流互感器的一次绕组串接在功率单元的输入回路中,所述电流采样模块通过二次绕组对功率单元的输入电流进行采样。It also includes a current transformer, the primary winding of the current transformer is connected in series in the input loop of the power unit, and the current sampling module samples the input current of the power unit through the secondary winding. 3.根据权利要求2所述的变频器的过电流保护装置,其特征在于,3. The overcurrent protection device of the frequency converter according to claim 2, characterized in that, 所述电流互感器为两相电流互感器,所述电流采样模块通过两相电流互感器对功率单元的两相输入电流进行采样,根据采样电流计算出第三相输入电流的采样电流。The current transformer is a two-phase current transformer, and the current sampling module samples the two-phase input current of the power unit through the two-phase current transformer, and calculates the sampling current of the third-phase input current according to the sampling current. 4.根据权利要求3所述的变频器的过电流保护装置,其特征在于,4. The overcurrent protection device of the frequency converter according to claim 3, characterized in that, 所述电流互感器与所述电流采样模块之间设置有电压跟随器。A voltage follower is arranged between the current transformer and the current sampling module. 5.根据权利要求4所述的变频器的过电流保护装置,其特征在于,5. The overcurrent protection device of the frequency converter according to claim 4, characterized in that, 所述第一比较模块由运算放大电路和比较器构成,所述第二比较模块由运算放大电路和比较器构成,所述第一比较模块的比较器的设定比较值根据功率单元上电时的启动电流设定,所述第二比较模块的比较器的设定比较值根据功率单元的最大工作电流设定。The first comparison module is composed of an operational amplifier circuit and a comparator, the second comparison module is composed of an operational amplifier circuit and a comparator, and the set comparison value of the comparator of the first comparison module is based on when the power unit is powered on The start-up current is set, and the set comparison value of the comparator of the second comparison module is set according to the maximum operating current of the power unit. 6.根据权利要求5所述的变频器的过电流保护装置,其特征在于,所述第一比较模块和第二比较模块通过光耦电路与所述比较通道选择模块连接。6 . The overcurrent protection device for a frequency converter according to claim 5 , wherein the first comparison module and the second comparison module are connected to the comparison channel selection module through an optocoupler circuit. 7.根据权利要求6所述的变频器的过电流保护装置,其特征在于,7. The overcurrent protection device of the frequency converter according to claim 6, characterized in that, 所述比较通道选择模块包括与变频器控制器连接,用于接收运行信号的端口电路,三个反相器,两个与门电路,一个或门电路,第一反相器的输入端通过光耦电路与第一比较模块连接,第二反相器的输入端通过光耦电路与第二比较模块连接,第一反相器的输出端与第一与门电路的一输入端连接,第二反相器的输出端与第二与门电路的一输入端连接,端口电路与第二与门电路的另一输入端连接,并通过第三反相器与第一与门电路的另一输入端连接,第一与门电路、第二与门电路的输出端分别与或门电路的两个输入端连接,或门电路的输出端与断路器控制器连接。The comparison channel selection module includes a port circuit connected to the frequency converter controller for receiving operating signals, three inverters, two AND gate circuits, one OR gate circuit, and the input terminal of the first inverter passes through the optical The coupling circuit is connected with the first comparison module, the input terminal of the second inverter is connected with the second comparison module through the optocoupler circuit, the output terminal of the first inverter is connected with an input terminal of the first AND gate circuit, and the second The output terminal of the inverter is connected with an input terminal of the second AND gate circuit, the port circuit is connected with the other input terminal of the second AND gate circuit, and is connected with the other input terminal of the first AND gate circuit through the third inverter The output terminals of the first AND gate circuit and the second AND gate circuit are respectively connected with the two input terminals of the OR gate circuit, and the output terminals of the OR gate circuit are connected with the circuit breaker controller. 8.根据权利要求1至7中任一项所述的变频器的过电流保护装置,其特征在于,8. The overcurrent protection device of the frequency converter according to any one of claims 1 to 7, characterized in that, 所述变频器为级联式高压变频器,所述断路器设置在移相变压器的输出或输入回路,所述断路器控制器设置在变频器控制器中。The frequency converter is a cascaded high-voltage frequency converter, the circuit breaker is set in the output or input circuit of the phase-shifting transformer, and the circuit breaker controller is set in the frequency converter controller.
CN201420002392.0U 2014-01-03 2014-01-03 Overcurrent protective device of frequency converter Expired - Lifetime CN203660511U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103762555A (en) * 2014-01-03 2014-04-30 北京合康亿盛变频科技股份有限公司 Over-current protection device and protection method for frequency converter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103762555A (en) * 2014-01-03 2014-04-30 北京合康亿盛变频科技股份有限公司 Over-current protection device and protection method for frequency converter

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Address after: 100043 Shijingshan District City, the ancient city of Beijing, West Street, No. 19 small and medium enterprises base

Patentee after: HICONICS ECO-ENERGY TECHNOLOGY Co.,Ltd.

Address before: 100176, No. two, No. 3, Yizhuang Economic Development Zone, Beijing, Beijing, Daxing District, Boxing

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