Power supply circuit and electronic equipment

Details Power supply circuit and electronic equipment Power supply circuit and electronic equipment

2007-08-07

2007-08-07

Caputo, Lisa (Department: 2809)

Electric power conversion systems

Current conversion

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

C363S021080, C363S021160, C363S020000

Reexamination Certificate

active

10504865

ABSTRACT:
A power factor is improved using a simplified structure without particularly providing a power factor improving circuit, and high efficiency is obtained. For this purpose, one terminal of a direct-current power source12, from which a pulsating current is obtained, is connected through a choke coil13to one end of an auxiliary coil14cconstituting a converter transformer14; the other end of the auxiliary coil14cis connected to the other terminal of the direct-current power source12through a series circuit of a diode15and a capacitor16; a connection midpoint between the diode15and the capacitor16is connected to one end of a primary coil14aof the converter transformer14; the other end of the primary coil14ais connected to the other terminal of the direct-current power source12through a switching element17; a secondary coil14bof the converter transformer14is connected to direct-current voltage output terminals19aand19bthrough a rectifying circuit18; the direct-current voltage output terminal19ais connected to an input side of a pulse width modulation control circuit20; and an output terminal of the pulse width modulation control circuit20is connected to a control electrode of the switching element17.

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International Search Report dated Apr. 13, 2004.

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