Method and Circuit to eliminate false triggering of power device

Details Method and Circuit to eliminate false triggering of power device Method and Circuit to eliminate false triggering of power device

1995-07-07

1997-01-14

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Gating

Signal transmission integrity or spurious noise override

327379, 327 26, 327 34, H03K 1716, H03K 1730

Patent

active

055943799

ABSTRACT:
A circuit for eliminating false triggering of a power device in an optically coupled drive circuit caused by dv/dt sensitivity of an optocoupler of the drive circuit comprising a latch circuit having an input coupled to an output of the optocoupler and having an inhibit input; and an inhibit signal generating circuit coupled to an output of the latch circuit for providing an inhibit signal of a preset period of time to the inhibit input of the latch circuit when the output of the latch circuit changes state, thereby inhibiting the passage of any high dv/dt spurious or noise signals to the output of the latch circuit during the preset period of time.

REFERENCES:
patent: 3473115 (1969-10-01), Oliver
patent: 3751689 (1973-08-01), Hogg
patent: 3863244 (1975-01-01), Lichtblau
patent: 3944934 (1976-03-01), Francis
patent: 4786823 (1988-11-01), Abe et al.
patent: 4795915 (1989-01-01), Sun et al.
patent: 5225687 (1993-07-01), Jason
patent: 5493538 (1996-02-01), Bergman

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