Non zero-voltage switching protection circuit

Details Non zero-voltage switching protection circuit Non zero-voltage switching protection circuit

1998-07-27

1999-10-26

Nappi, Robert E.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363 58, 323235, H02H 7122

Patent

active

059739436

ABSTRACT:
A protection circuit for preventing non zero-voltage switching of a lamp resonant output circuit driven by upper and lower half-bridge switches. The protection circuit includes a sense resistor disposed between the lower half bridge switch and ground for developing a voltage corresponding to the current flowing through the lower switch. A comparator compares the voltage developed across the sense resistor against a fixed reference voltage and generates an output indicative of a non zero-voltage switching condition when the voltage across the sense resistor exceeds the fixed reference voltage. A latch is connected to the output of the comparator and generates a latch output signal which disables the generation of drive signals to the upper and lower switches in the event of a non zero-voltage switch condition.

REFERENCES:
patent: 5233287 (1993-08-01), Lenk
patent: 5371667 (1994-12-01), Nakao et al.
patent: 5764466 (1998-06-01), Mangtani et al.

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