A protection circuit and method with high-speed detection of igbt short-circuit fault
A short-circuit fault and circuit protection technology, applied in the direction of measuring electricity, short-circuit testing, measuring electrical variables, etc., can solve the problems of increasing the risk of IGBT damage, small change in gate charge, and no circuit, and achieve short-circuit detection time. , The parameters are easy to set, and the effect of the detection circuit is simple
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[0037] The principles and features of the present invention will be described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.
[0038] Such as figure 1 As shown, the gate drive voltage V of the IGBT under normal conduction and HSF short-circuit conditions GG and gate voltage V GE The comparison diagram of the change with time, in which the dotted line part of the gate drive voltage V GG The graph of the change with time, the solid line part is the gate V GE Graph of relationships over time.
[0039] Depend on figure 1 It can be seen that when the IGBT is normally turned on, its gate voltage has a Maitreya plateau stage in the process of rising. At this time, the gate drive voltage V GG and gate voltage V GE The difference is very large, and when the IGBT is short-circuited by HSF, the gate drive voltage V GG and gate voltage V GE...
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