Switched-mode power supply having a reduced harmonic load on the

Details Switched-mode power supply having a reduced harmonic load on the Switched-mode power supply having a reduced harmonic load on the

1997-03-17

2000-07-11

Wong, Peter S.

Electric power conversion systems

Current conversion

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

363 56, 363 95, 363131, H02M 3335, H02M 324, H02M 7537, H02H 7122

Patent

active

060882425

ABSTRACT:
A switched mode power supplier having an improved power factor, that is to say a reduced harmonic load on the mains comprising a switch mode power supply with a reduced harmonic load on mains, comprising a mains rectifier being coupled to a charge capacitor and to a series circuit, the series circuit comprising a decoupling element, a primary winding of a transformer, a switching transistor, and an energy storage capacitor coupled in parallel with the primary winding and the switching transistor, with the voltage thereacross being a smoothed DC voltage, the charge capacitor being further coupled to a tap of said primary winding via a second series circuit comprising an inductor and a diode, and the inductor and the diode being connected via a second diode to a point with a fixed voltage.

REFERENCES:
patent: 4336587 (1982-06-01), Boettcher, Jr. et al.
patent: 4782436 (1988-11-01), Gilliland
patent: 5088017 (1992-02-01), Yaginuma et al.
patent: 5119262 (1992-06-01), Ikeuchi
patent: 5162981 (1992-11-01), Lazar et al.
patent: 5390099 (1995-02-01), Rilly et al.
patent: 5673184 (1997-09-01), Rilly et al.
European Search Report, dated Jun. 23, 1997.

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