Overcurrent protection device

Details Overcurrent protection device Overcurrent protection device

2008-04-08

2008-04-08

Leja, Ronald W. (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

Reexamination Certificate

active

10992104

ABSTRACT:
The switching regulator comprises a main switch, a rectifier switch, an RS-flipflop, a judging unit, an edge pulse generator, a second prohibiting unit, and a reference voltage source. When a voltage drop caused due to an on-resistance of the main switch exceeds a predetermined value, the judging unit sets a set signal of the RS-flipflop at a high level, and thereby an overcurrent is cut off. The edge pulse generator monitors a gate voltage of the rectifier switch, and sets a prohibition signal at a high level for a predetermined time period from the trailing edge. Then, the second prohibiting unit sets the set signal at a low level, and prohibits cutting the overcurrent off. Herewith, the likelihood that the main switch will be destroyed by the overcurrent can be reduced.

REFERENCES:
patent: 5612610 (1997-03-01), Borghi et al.
patent: 5745352 (1998-04-01), Sandri et al.
patent: 2004/0201935 (2004-10-01), Yamamoto
patent: 07-177731 (1995-07-01), None
patent: 2000-245141 (2000-09-01), None
patent: 2002-27737 (2002-01-01), None
Office Action Dated Jul. 18, 2006.

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