Switching power supply unit and semiconductor device for...

Details Switching power supply unit and semiconductor device for... Switching power supply unit and semiconductor device for...

2006-10-03

2006-10-03

Vu, Bao Q. (Department: 2838)

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

C363S021170, C363S021120

Reexamination Certificate

active

07116564

ABSTRACT:
Overload protecting operation is performed by controlling the current peak value of a switching device1through the use of a comparator8, a NAND circuit5, and so on according to variations in feedback current being input to a feedback signal control circuit11, internally setting the overcurrent protection of switching device1through the use of a clamp circuit12, charging a capacitor34when having fallen below a specified current smaller than current required for the overcurrent protection for a fixed time period, and detecting rise in voltage VOL at the capacitor34to a constant voltage to stop switching operation.By achieving the overload protection under normal load and the overcurrent protection against peak load in a single switching power supply unit, problems such as the complexity of the unit and an increase in the element count of the control circuit are solved.

REFERENCES:
patent: 6674656 (2004-01-01), Yang et al.
patent: 6879501 (2005-04-01), Mori
patent: 6958920 (2005-10-01), Mednik et al.
patent: 6980444 (2005-12-01), Takahashi
patent: 7035119 (2006-04-01), Koike
patent: 06038518 (1994-02-01), None

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