Overcurrent protection and masking circuitry for protection...

Details Overcurrent protection and masking circuitry for protection... Overcurrent protection and masking circuitry for protection...

2005-01-11

2005-01-11

Nguyen, Minh (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Gating

Utilizing three or more electrode solid-state device

C327S419000, C361S093100, C323S276000

Reexamination Certificate

active

06842064

ABSTRACT:
An overcurrent protection circuit (6) outputs an overcurrent protection signal (S6) based on a sense voltage (Vsense). A masking circuit (5) is configured so as to allow a masking signal (S5) to be kept set to “L” even when an input signal (IN) rises to “H” (an IGBT (1) is turned on) and an NPN bipolar transistor (23) is turned off, and allow the masking signal (S5) to be changed only after a capacitor (C12) is charged up and a voltage (V9) exceeds a reference voltage (VR). An AND gate (25) receives the masking signal (S5) at one of input terminals thereof and the overcurrent protection signal (S6) at the other of the input terminals thereof, and provides an output which is then output as an interruption control signal (SC_OUT) from a sense output terminal (P2) and is finally supplied to a gate terminal (P3) of the IGBT (1).

REFERENCES:
patent: 5325258 (1994-06-01), Choi et al.
patent: 5375029 (1994-12-01), Fukunaga et al.
patent: 5396117 (1995-03-01), Housen et al.
patent: 5444595 (1995-08-01), Ishikawa et al.
patent: 5710508 (1998-01-01), Watanabe
patent: 6717785 (2004-04-01), Fukuda et al.

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