High input impedance gate driver circuit with Miller protection

Details High input impedance gate driver circuit with Miller protection High input impedance gate driver circuit with Miller protection

1994-12-20

1996-07-09

Nelms, David C.

Miscellaneous active electrical nonlinear devices, circuits, and

Gating

Utilizing three or more electrode solid-state device

327434, 327443, 327108, H03K 17687, H03K 1772, H03B 100

Patent

active

055348149

ABSTRACT:
A gate driver circuit includes a timing circuit, an anti-Miller surge protection circuit, and charging and discharging circuits for driving an output transistor, such as an IGBT. The anti-Miller surge protection circuit prevents the output transistor from being accidentally turned on. The gate driver circuit provides a high impedance input, so as to allow such a gate driver circuit to be driven by a relatively smaller isolation transformer. Further, the timing circuit in the gate driver circuit of the present invention allows such isolation transformer a relative lower frequency of operation. In one embodiment, the capacitance of the output transistor's gate terminal is used to determine the time constant of the timing circuit.

REFERENCES:
patent: 4052623 (1977-10-01), Loberg
patent: 4461966 (1984-07-01), Hebenstreit
patent: 5023471 (1991-06-01), Pauly
patent: 5027018 (1991-06-01), Kindlmann et al.
patent: 5404059 (1995-04-01), Loffer
patent: 5434527 (1995-07-01), Antone
patent: 5438294 (1995-08-01), Smith
patent: 5470341 (1995-11-01), Kuehn et al.

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