Constant current drooping switching power supply

Details Constant current drooping switching power supply Constant current drooping switching power supply

2007-01-09

2007-01-09

Vu, Bao Q. (Department: 2838)

Electric power conversion systems

Current conversion

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

C363S021160, C363S021180

Reexamination Certificate

active

11134462

ABSTRACT:
A switching power supply for achieving a constant current drooping characteristic of sufficient accuracy with low cost and the minimum number of components. In the switching power supply, a secondary duty limiter circuit outputs a clock signal from the time a switching element is turned off until the time the on duty of secondary current, which starts flowing to a secondary winding of a transformer, is fixed at a predetermined value. A clock signal selector circuit selects and outputs the clock signal when a load increases and the on duty of the secondary current reaches the predetermined value. Consequently, when the load increases, a direct current output voltage decreases and an output characteristic becomes a constant current drooping characteristic. At this point, when the voltage of an element current detection signal reaches an overcurrent protection reference voltage, a drain current control circuit outputs a turn-off signal for determining the turn-off of the switching element, therefore the peak current of the secondary current is kept at a fixed value.

REFERENCES:
patent: 5880942 (1999-03-01), Leu
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patent: 6515876 (2003-02-01), Koike et al.
patent: 6529391 (2003-03-01), Yoshinaga et al.
patent: 6532159 (2003-03-01), Nishida et al.
patent: 6922345 (2005-07-01), Nishida et al.
patent: 6963496 (2005-11-01), Bimbaud
patent: 06149396 (1994-05-01), None

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