Switching power source

Details Switching power source Switching power source

2005-03-22

2008-07-01

Han, Jessica (Department: 2838)

Electric power conversion systems

Current conversion

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

C363S019000, C363S021130, C363S021180, C363S097000

Reexamination Certificate

active

07394670

ABSTRACT:
A control circuit8of a switching power source comprises a voltage detector31for detecting a voltage VDCof a DC power supply1to produce a detection voltage VDT; a comparator41for producing an output signal VCPwhen detection voltage VDTfrom voltage detector31exceeds a reference voltage VR2; a bottom voltage detector51for detecting a bottom point of voltage VDSacross a MOS-FET3after energy has been discharged from transformer2; and a switching controller61for selectively turning MOS-FET3on depending on existence or absence of the output signal VCPfrom comparator41. When the input voltage VDCfrom DC power supply1so rises that detection voltage VDTof voltage detector31is above the reference voltage VR2, switching controller61serves to late turn MOS-FET3on at the time bottom voltage detector51detects the second or later bottom point of the voltage VDSacross MOS-FET3, extending the off period of MOS-FET3to reduce switching frequency of MOS-FET3.

REFERENCES:
patent: 5901051 (1999-05-01), Takahashi et al.
patent: 6134123 (2000-10-01), Yamada
patent: 6529391 (2003-03-01), Yoshinaga et al.
patent: 7035119 (2006-04-01), Koike
patent: 2003-061345 (2003-02-01), None
patent: 2003-125582 (2003-04-01), None
patent: 2003-125585 (2003-04-01), None
patent: WO 2004023634 (2004-03-01), None
Machine Translation for WO2004/023634; Koike; Switching Power Source Device; Mar. 18, 2004; 26 pages.

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