Switching power supply

Details Switching power supply Switching power supply

2005-04-12

2005-04-12

Laxton, Gary L. (Department: 2838)

Electric power conversion systems

Current conversion

Including automatic or integral protection means

C323S909000, C323S909000, C323S909000

Reexamination Certificate

active

06879501

ABSTRACT:
The present invention provides a switching power supply which has an overcurrent protection characteristic with a small number of components. The switching power supply includes a regulator from a drain and an auxiliary winding VCC, a drain current detection circuit for detecting a current applied to a switching element, an oscillation circuit for outputting a clock signal of a constant frequency, a feedback signal control circuit for detecting a control signal from the secondary side and controlling current applied to the switching element, a clamping circuit for controlling the maximum value of current applied to the switching element, and a clamp voltage variable circuit for changing a clamp voltage of the clamping circuit and an oscillation frequency of the oscillation circuit according to a voltage of VCC.

REFERENCES:
patent: 5412556 (1995-05-01), Marinus
patent: 5825638 (1998-10-01), Shutts
patent: 8-103075 (1996-04-01), None
patent: 2003-274844 (2003-09-01), None

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