Switching power source device

Details Switching power source device Switching power source device

2006-04-25

2006-04-25

Laxton, Gary L (Department: 2838)

Electric power conversion systems

Current conversion

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

C363S021130, C363S021180, C363S097000

Reexamination Certificate

active

07035119

ABSTRACT:
A switching power source comprises a current comparator27for comparing a voltage level of signals acquired by a current detector9with a reference voltage level VDTto produce detection signals VCPof first or second level L or H; an edge detector28afor sensing an edge of drive signal VGsupplied to a gate terminal of MOS-FET3during the period of transition from turning on to off of MOS-FET3; and a decision means28bfor receiving a current detection signal VCPfrom current comparator27to produce an output signal VLDwhen edge detector28acatches an edge of drive signal VG; wherein decision means28bproduces different output signals VLDof respectively first and second voltage levels L and H under the light and heavy load conditions to precisely and certainly detect on the primary side of transformer2the load condition on the secondary side of transformer2for improvement in conversion efficiency.

REFERENCES:
patent: 5999421 (1999-12-01), Liu
patent: 6515876 (2003-02-01), Koike et al.
patent: 6529391 (2003-03-01), Yoshinaga et al.
patent: 6842350 (2005-01-01), Yamada et al.
patent: 6947298 (2005-09-01), Uchida

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