发明名称 |
Over-current protection apparatus for transistor |
摘要 |
The disclosed invention is designed to prevent the oscillation which often occurs in an over-current protection apparatus for an insulated gate controlled transistor. The apparatus improves the response in current detection, to prevent oscillation, and improves protection speed against over-current. This is accomplished by separating the gates of the main transistor and the current detector transistor; by setting a shorter time constant for the gate circuit of the current detector transistor than that of the gate circuit of the main transistor; by feeding the detection signal obtained from the current detecting means which detects the current i of the current detector transistor proportional to the current I flowing through the main transistor, to the control means; and by controlling the gate potentials of both transistors to protect the main transistor from the over-current by feeding the comparison output Sd from the comparator circuit, which compares the voltage of the signal Vd with the reference voltage Vr, to the control circuit.
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申请公布号 |
US5621601(A) |
申请公布日期 |
1997.04.15 |
申请号 |
US19940314320 |
申请日期 |
1994.09.28 |
申请人 |
FUJI ELECTRIC CO., LTD. |
发明人 |
FUJIHIRA, TATSUHIKO;KIUCHI, SHIN;YOSHIDA, KAZUHIKO;YANO, YUKIO;OYABE, KAZUNORI;FURUHATA, SHOICHI;MORIMOTO, TETSUHIRO |
分类号 |
H01L29/78;G05F1/56;H01L27/02;H01L27/04;H02H7/12;H02M1/00;H03K17/082;(IPC1-7):H02H3/00 |
主分类号 |
H01L29/78 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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