CE voltage detection device and method for igbt
A voltage detection and to-be-detected technology, applied in the field of electronics to facilitate fault diagnosis, enhance reliability and stability, and achieve intelligent control
Active Publication Date: 2022-04-26
CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
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Problems solved by technology
[0002] IGBTs are widely used in the field of converters, and the stability of the converter is particularly important. When a fault occurs, it needs to be able to respond quickly, otherwise it will cause greater economic losses
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[0035] In order to make the object, technical solution and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0036] The invention can detect multiple digital state information of the collector signal VCE at the same time, and then determine the electrical faults that may occur during IGBT operation, thereby locating faults more quickly and accurately, providing signal input for fault diagnosis and intelligent control, and greatly simplifying Troubleshooting work.
[0037] figure 1 A structural block diagram of a CE voltage detection device for an IGBT according to an embodiment of the present invention is shown.
[0038] Such as figure 1 , CE voltage detection device 100 includes active isolation detection unit 101, CE voltage detection sampling unit 102, state monitoring threshold setting unit 103, CE voltage state comparison unit 104, current mirro...
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The present invention provides a CE voltage detection device for IGBT, which includes: an active isolation detection unit, which is used to obtain a CE voltage signal VAC1; a CE voltage detection sampling unit, which is used to perform resistance step-down on the CE voltage signal VAC1 Converted to a comparative input signal Vce; a state monitoring threshold setting unit, which is used to set the state monitoring threshold Vref1 of the IGBT collector CE voltage to be detected; a CE voltage state comparison unit, which is used to determine the first CE voltage state of the IGBT to be detected ; Current mirror state comparison unit, which is used to obtain the second CE voltage state of the IGBT to be detected; CE voltage state conversion unit, which is used to obtain the first CE voltage state after level conversion and the second CE after level conversion Voltage state: CE voltage state processing unit, which is used to obtain the first state code and the second state code. The invention can quickly and accurately locate the CE voltage fault of the IGBT collector, facilitates fault diagnosis, and is beneficial to realize intelligent control.
Description
technical field [0001] The invention relates to the field of electronic technology, in particular to a CE voltage detection device and method for IGBT. Background technique [0002] IGBTs are widely used in the field of converters, and the stability of the converter is particularly important. When a fault occurs, it needs to be able to respond quickly, otherwise it will cause large economic losses. The collector signal VCE of the IGBT is an important parameter index for its normal operation, and is often used to determine the overcurrent and short circuit faults of the IGBT. [0003] In the prior art, it is often necessary to disassemble the corresponding driver board and IGBT, debug step by step to find out the fault point, and then perform fault analysis. In order to simplify troubleshooting, realize fault diagnosis and intelligent control, it is necessary to monitor multiple digital state information of the collector signal VCE, so as to quickly and accurately locate the...
Claims
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IPC IPC(8): G01R19/165G01R31/26G01R31/52G01R31/56
CPCG01R19/16576G01R31/2601
Inventor 陈正文魏海山梁玉朱武王晓年孙康康马龙昌欧阳柳唐威杨乐乐陈燕平窦泽春
Owner CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST