CN105244849A - Overcurrent protection method and device for IGCT rectifier - Google Patents
Overcurrent protection method and device for IGCT rectifier Download PDFInfo
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- CN105244849A CN105244849A CN201510829687.4A CN201510829687A CN105244849A CN 105244849 A CN105244849 A CN 105244849A CN 201510829687 A CN201510829687 A CN 201510829687A CN 105244849 A CN105244849 A CN 105244849A
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Abstract
The invention provides an overcurrent protection method and device for an IGCT rectifier, wherein when a system is failed and a current is too large, an IGCT can be still prevented from being damaged. The method comprises the steps that multi-channel rectifier current signals which are collected with different delays are received; multi-stage protection is formed on the timing sequence according to comparing results of the multi-channel collected current signals and corresponding threshold values. The device comprises a short circuit protection circuit board of multi-channel optocoupler chips, a current conditioning circuit, a first chip and a second chip; the short circuit protection circuit board is used for collecting multi-channel H-bridge rectifier current signals based on the IGCT; the current conditioning circuit is used for collecting the multi-channel H-bridge rectifier current signals based on the IGCT; the first chip is used for sending a protection control signal according to the current signals collected by the multi-channel optocoupler chips and the current conditioning circuit which are connected with the first chip; the second chip is used for sending a protection control signal according to the current signals collected by the current conditioning circuit connected with the second chip; the response time of the protection control signal sent by the first chip is different from that of the protection control signal sent by the second chip.
Description
Technical field
The present invention relates to the overcurrent protection of rectifier, be specially a kind of method and apparatus of overcurrent protection of IGCT rectifier.
Background technology
The device for high-power power electronic of the advantages such as integral gate change transistor IGCT has withstand voltage height, electrical current is large, reliability is high, loss is low, compact conformation; but be limited to the inherent characteristic of IGCT; when tackling short trouble etc. and causing the operating mode of abnormal big current; response need be protected fast; otherwise after electric current exceeds maximum controllable current, perform turn-off protection action again, IGCT device failure will be caused.Meanwhile, when system power is no more than the overload curves of permission, Over Current Protection System does not answer misoperation.
Summary of the invention
For problems of the prior art, the invention provides a kind of system failure electric current of working as excessive, also can avoid the method and apparatus of overcurrent protection IGCT being caused to the IGCT rectifier of damage.
The present invention is achieved through the following technical solutions:
A method for the overcurrent protection of IGCT rectifier, receives the current signal of the rectifier that multichannel different delay gathers; The result that the current signal gathered according to each road compares with corresponding threshold value, sequential forms multi-stage protection.
Preferably, the current signal of the rectifier of multichannel different delay collection collects respectively by the opto-coupler chip in current regulating circuit and short-circuit protection circuit plate.
Further, the value of current signal of the rectifier gathered by current regulating circuit protects threshold value to compare with the first order of setting; If be greater than, then send the cut-off signals of IGCT after time delay; Wherein, first order protection threshold value be 1.2 times to 2 times of IGCT rectifier rated current between numerical value.
Further again, the value of the current signal of the rectifier gathered by current regulating circuit and the second level of setting protect threshold value to compare; If be greater than, then send the cut-off signals of IGCT; Wherein, protection threshold value in the second level is the numerical value between 2 times of the IGCT rectifier rated current maximum controllable current values to IGCT.
Further again, the value of the current signal of the rectifier gathered by opto-coupler chip and the third level of setting protect threshold value to compare; If be greater than, then the process chip by arranging accept fault level energizing signal and send IGCT open signal; Wherein, third level protection threshold value is equal to or slightly less than the maximum controllable current value of IGCT.
Further again, the current signal that every road gathers comprises two branch roads; The value of the current signal of each branch road is respectively used to the comparison of follow-up and corresponding threshold value; One of them branch road is for gathering the input current value of mains side in IGCT rectifier; Another branch road is for gathering IGCT rectifier median generatrix DC current values.
Further again, adopt DSP process chip to perform and protect the comparison step of threshold value and the step of corresponding protection operation containing the first order;
Adopt CPLD or FPGA process chip to perform the comparison step containing third level protection threshold value or contain the comparison step of second level protection threshold value and third level protection threshold value simultaneously, and performing the corresponding step protecting operation.
An overcurrent protective device for IGCT rectifier, comprises the short-circuit protection circuit plate of multichannel opto-coupler chip, for gathering the H bridge rectifier current signal of multichannel based on IGCT; Current regulating circuit, for gathering the H bridge rectifier current signal of multichannel based on IGCT; First chip, for the current signal gathered according to the multichannel opto-coupler chip connected and current regulating circuit, sends protecting control signal; Second chip, for the current signal gathered according to the current regulating circuit connected, sends protecting control signal; Wherein, described first chip is different with the response time of the protecting control signal that the second chip sends.
Preferably, the first chip is CPLD chip or fpga chip; Described second chip is dsp chip.
Compared with prior art, the present invention has following useful technique effect:
The present invention is based on the overcurrent protection of the H bridge rectifier of IGCT, the different hardware acquisition component respectively by current regulating circuit and short-circuit protection circuit plate is arranged, and forms different acquisition times; Also pass through the chip of different disposal ability and response speed, the contrast operation of different collection signals is performed, and then form the operation response of different delay, thus form protection in sequential.
Further, utilize different branch to gather current value different classes of in IGCT rectifier, compare with various level threshold value respectively, applied widely, working stability is reliable.
Accompanying drawing explanation
Fig. 1 is the flow chart described in the embodiment of the present invention.
Fig. 2 is the block diagram of the apparatus structure described in the embodiment of the present invention;
Fig. 3 is the structure chart of the IGCT of H bridge in the embodiment of the present invention;
Fig. 4 is the circuit structure diagram of the opto-coupler chip in the embodiment of the present invention in short-circuit protection circuit plate.
Fig. 5 is the circuit structure diagram of current regulating circuit in the embodiment of the present invention.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in further detail, and the explanation of the invention is not limited.
See Fig. 1, embodiments of the invention provide a kind of method of overcurrent protection of IGCT rectifier, comprising:
S11: the current signal receiving the rectifier that multichannel different delay gathers;
S12: compare with corresponding threshold value according to the current signal that each road gathers, according to comparative result, sequential forms multi-stage protection.
By the scheme in the above embodiments, by the current signal of multi pass acquisition and comparing of threshold value, form the circuit protection of multichannel different delay.In the signal of multichannel, comprise the current signal of response time than the rectifier gathered by opto-coupler chip faster; Also comprise the current signal of the rectifier gathered by current regulating circuit.
Accordingly, the threshold value compared, and relatively after protection not identical yet.
The signal gathered is the current signal of the rectifier gathered by current regulating circuit; Comparison procedure comprises: protect threshold value to compare with the second level of setting the value of the current signal of the rectifier gathered by current regulating circuit: if be greater than, then send the cut-off signals of IGCT; Wherein, described second level protection threshold value be the rated current of the rectifier systems that described IGCT forms 2 times of values to IGCT maximum controllable current value between numerical value.
The value of current signal of the rectifier gathered by opto-coupler chip is adopted to protect threshold value to compare with the third level of setting; If be greater than, then the fault level energizing signal accepted by the first chip and send IGCT open signal; Wherein, described third level protection threshold value equals or is slightly less than the maximum controllable current value of described IGCT.
Above-mentioned rear two-way current signal, by different hardware acquisition component, forms different acquisition times, and then forms the operation response of different delay, thus forms protection in sequential.
Preferably, protection operation can also be performed by the chip of different disposal abilities, thus form the protection in sequential further.
See Fig. 2, this preferred embodiment, also can add the chip of polylith different disposal ability, and then forms the protection scheme of Multilevel Response time.In fig. 2; adopt two chip blocks; such as; first chip adopts CPLD or fpga chip to perform the comparison protecting threshold value containing the third level; and execution protects operation accordingly; can also perform simultaneously protect the comparison of threshold value and the comparison of third level protection threshold value containing the second level, and execution protects operation accordingly.
Second chip adopts dsp chip to perform the step comparing and protect threshold value containing the first order, and execution protects operation accordingly.
The value of the current signal of the rectifier that the second chip is gathered by current regulating circuit by the first chip or independent acquisition, protects threshold value to compare with the first order of setting: if be greater than, then to send the cut-off signals of IGCT after time delay; Wherein, between described first order protection threshold value is 1.2 times to 2 times of the rated current of the rectifier systems that described IGCT forms.
By above-mentioned step, can realize, not by means of only different hardware acquisition component, forming different acquisition times, also by the chip of different disposal ability, response speed, and then form the operation response of different delay, thus form protection in sequential.
See Fig. 3, the current transformer of the applicable various topological structures based on IGCT of the scheme in above-described embodiment, comprise the H bridge type rectifier in Fig. 2, wherein UN is input ac voltage, and LN is phase modulation reactance.Form H bridge by T1, T2, T3 and T4 of IGCT and antiparallel fast recovery diode D1, D2, D3 and D4, Cd is Support Capacitor, is connected in the middle of DC bus.The current signal that every road gathers at least comprises two branch roads; The value of the current signal of each branch road is respectively used to follow-up comparison; One of them branch road is the current value of input power side; Another branch road is bus DC current values.That is, in each and threshold value comparison procedure, be that the current value of two branch roads compares with threshold value respectively, as long as there is the comparative result of a branch road to meet the demands, then perform subsequent step further.
In an embodiment, current regulating circuit, multiple hardwares structure can be adopted to realize, such as shown in Fig. 5, mainly contain three part compositions, part 1 flows through sampling resistor after electric capacity C4 filtering, and current signal is converted to voltage signal, part 2 is the inverter be made up of amplifier, and of ac signal is converted to electrode signal; 3rd part is clamp amplitude limiter circuit, prevents the permissible value that voltage signal inputs more than the first chip.
Opto-coupler chip can adopt the structure shown in Fig. 4, and in the diagram, adopt the identical opto-coupler chip in 3 tunnels to realize the collection of 3 branch roads, can use two branch roads wherein, another branch road is for subsequent use.
This preferred embodiment also provides a kind of device of overcurrent protection of the H bridge rectifier based on IGCT, as shown in Figure 2, comprising: for gathering H bridge rectifier current signal multichannel opto-coupler chip and the current regulating circuit of multiplex IGCT; For the current signal gathered according to the described multichannel opto-coupler chip connected, described current regulating circuit, send the first chip of protecting control signal; For the current signal gathered according to the described current regulating circuit connected, send the second chip of protecting control signal; Wherein, response time of protecting control signal of sending of described first chip, the second chip is different.First chip is CPLD chip or fpga chip; Second chip is dsp chip.
Realize above-mentioned procedure by above-mentioned device, certainly, above-mentioned device is a kind of form, can also have corresponding distortion or equivalent structure of replacing.
For the method and apparatus of setting forth in each embodiment of the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a method for the overcurrent protection of IGCT rectifier, is characterized in that, receives the current signal of the rectifier that multichannel different delay gathers; The result that the current signal gathered according to each road compares with corresponding threshold value, sequential forms multi-stage protection.
2. the method for the overcurrent protection of a kind of IGCT rectifier according to claim 1; it is characterized in that, the current signal of the rectifier of described multichannel different delay collection collects respectively by the opto-coupler chip in current regulating circuit and short-circuit protection circuit plate.
3. the method for the overcurrent protection of a kind of IGCT rectifier according to claim 2, is characterized in that, the value of the current signal of the rectifier gathered by current regulating circuit and the first order of setting protect threshold value to compare; If be greater than, then send the cut-off signals of IGCT after time delay; Wherein, first order protection threshold value be 1.2 times to 2 times of IGCT rectifier rated current between numerical value.
4. the method for the overcurrent protection of a kind of IGCT rectifier according to claim 3, is characterized in that, the value of the current signal of the rectifier gathered by current regulating circuit and the second level of setting protect threshold value to compare; If be greater than, then send the cut-off signals of IGCT; Wherein, protection threshold value in the second level is the numerical value between 2 times of the IGCT rectifier rated current maximum controllable current values to IGCT.
5. the method for the overcurrent protection of a kind of IGCT rectifier according to claim 4, is characterized in that, the value of the current signal of the rectifier gathered by opto-coupler chip and the third level of setting protect threshold value to compare; If be greater than, then the process chip by arranging accept fault level energizing signal and send IGCT open signal; Wherein, third level protection threshold value is equal to or slightly less than the maximum controllable current value of IGCT.
6. the method for the overcurrent protection of a kind of IGCT rectifier according to claim 5, is characterized in that, the current signal that every road gathers comprises two branch roads; The value of the current signal of each branch road is respectively used to the comparison of follow-up and corresponding threshold value; One of them branch road is for gathering the input current value of mains side in IGCT rectifier; Another branch road is for gathering IGCT rectifier median generatrix DC current values.
7. the method for the overcurrent protection of a kind of IGCT rectifier according to claim 5, is characterized in that, adopts DSP process chip to perform and protects the comparison step of threshold value and the step of corresponding protection operation containing the first order;
Adopt CPLD or FPGA process chip to perform the comparison step containing third level protection threshold value or contain the comparison step of second level protection threshold value and third level protection threshold value simultaneously, and performing the corresponding step protecting operation.
8. an overcurrent protective device for IGCT rectifier, is characterized in that, comprising:
The short-circuit protection circuit plate of multichannel opto-coupler chip, for gathering the H bridge rectifier current signal of multichannel based on IGCT;
Current regulating circuit, for gathering the H bridge rectifier current signal of multichannel based on IGCT;
First chip, for the current signal gathered according to the multichannel opto-coupler chip connected and current regulating circuit, sends protecting control signal;
Second chip, for the current signal gathered according to the current regulating circuit connected, sends protecting control signal;
Wherein, described first chip is different with the response time of the protecting control signal that the second chip sends.
9. the overcurrent protective device of a kind of IGCT rectifier according to claim 8, is characterized in that, described first chip is CPLD chip or fpga chip; Described second chip is dsp chip.
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| CN201510829687.4A CN105244849B (en) | 2015-11-25 | 2015-11-25 | A kind of method and apparatus of the overcurrent protection of IGCT rectifier |
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| CN201510829687.4A CN105244849B (en) | 2015-11-25 | 2015-11-25 | A kind of method and apparatus of the overcurrent protection of IGCT rectifier |
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| CN107769156A (en) * | 2016-08-18 | 2018-03-06 | 中国电力科学研究院 | A kind of method of achievable equipment safety adaptive guard action |
| CN114498548A (en) * | 2022-01-21 | 2022-05-13 | 合肥科威尔电源系统股份有限公司 | Overcurrent protection method and device |
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| CN107515329A (en) * | 2017-08-30 | 2017-12-26 | 国电南瑞科技股份有限公司 | A kind of IGBT synthesis overcurrent protection methods and system based on digital filtering |
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