Switching power supply circuit of current-resonance type without

Details Switching power supply circuit of current-resonance type without Switching power supply circuit of current-resonance type without

1995-10-03

1999-10-26

Berhane, Adolf Denske

Electric power conversion systems

Current conversion

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

363 97, H02M 3338

Patent

active

059739371

ABSTRACT:
A switching power supply circuit of current-resonance type with the capability of power factor improvement includes a filter capacitor (C.sub.N) connected between the positive and negative output terminals of the rectifier, a filter choke coil (L.sub.N) and fast-recovery diode (D.sub.2) connected in series to cut in on the rectifier output line, and a resonant capacitor (C.sub.2) which forms a resonant circuit in unison with the filter choke coil. The output of a series resonant circuit (C.sub.1,N.sub.1) on the primary side is superimposed on the rectifier output so that the power factor is improved, thereby eliminating the need of a choke coil (CH). The circuit accomplishes the more compact, light-weight and low-cost design, and improves the power conversion efficiency.

REFERENCES:
patent: 4369491 (1983-01-01), Rizzi
patent: 4424556 (1984-01-01), Maeda et al.
patent: 5216585 (1993-06-01), Yasumura
patent: 5640310 (1997-06-01), Yasumura
patent: 5675491 (1997-10-01), Kijima
patent: 5835368 (1998-11-01), Yasumura

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