Switching power supply

Details Switching power supply Switching power supply

2004-11-08

2010-10-26

Laxton, Gary L (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

C323S271000, C363S021030, C363S021120

Reexamination Certificate

active

07821239

ABSTRACT:
A switching power-supply unit uses a time when a transformer voltage Vt inverts due to a rectifier diode (Ds1) entering a non-conducting state as a trigger, and a first switching control circuit (CNT1) turns on a first switching element (Q1) after a predetermined delay time passes. A second switching control circuit (CNT2) turns on a second switching element (Q2) using a time when the transformer voltage Vt inverts due to turning off of the first switching element (Q1) as a trigger. A third switching control circuit (CNT3) turns on a third switching element (Q3) using turning off of the second switching element (Q2) as a trigger. The first switching control circuit (CNT1) determines a period ton1of the first switching element (Q1) such that a first output voltage Vo1is set to a predetermined value. The second switching control circuit (CNT2) determines an ON-period ton2of the second switching element (Q2) such that a second output voltage Vo2is set to a predetermined value. The third switching control circuit (CNT3) determines an ON-period ton3of the third switching element (Q3) such that a third output voltage Vo3is set to a predetermined value.

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Electrical Engineering Handbook (Sixth Edition) by the Institute of Electrical Engineers of Japan, Feb. 20, 2001, vol. 20, Chapter 9, Section 2 Switching Regulator, pp. 851-852.
Official communication issued in the counterpart Chinese Application No. 200480002604.4, mailed on Jul. 6, 2007.
Official Communication issued in corresponding Chinese Patent Application No. 200480002604.4, mailed on Jul. 24, 2009.
Official communication issued in counterpart Chinese Patent Application No. 200480026044, mailed on Feb. 5, 2010.

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