A igbt short circuit overcurrent detection circuit
A detection circuit, short circuit and overcurrent technology, applied in the direction of bipolar transistor test, single semiconductor device test, etc., to achieve the effect of cost saving, simple structure and easy integration
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[0048] Below in conjunction with the drawings, preferred embodiments of the present invention are given and described in detail.
[0049] Such as Figure 4 As shown, the present invention, that is, an IGBT short-circuit overcurrent detection circuit, includes: a first IGBT Q 1 , the second IGBTQ 2 , gate driver module Gate Driver, field programmable gate array FPGA, bandpass filter Filter1, first comparator CMP 1 , the second comparator CMP 2 , the third comparator CMP 3 , T flip-flop D 1 , AND gate AND and RS flip-flop SR, where,
[0050] First IGBT Q 1 is the IGBT to be detected, and it is connected with the second IGBT Q 2 connected in series between the bus bar and ground, the first IGBT Q in the series 1 and the second IGBT Q 2 constitute a half-bridge structure; specifically: the second IGBT Q 2 The collector receives the power loop bus voltage V supply , whose gate is connected to its emitter to the first IGBT Q 1 collector of the first IGBT Q 1 The emitter...
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