Power source device

Details Power source device Power source device

1998-03-17

2000-06-13

Wolfe, Willis R.

Electric power conversion systems

Current conversion

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

363 48, 363132, H02M 5458, H02M 7537

Patent

active

060757159

ABSTRACT:
A power source device is so constituted that a first capacitor connected across DC output terminals of a rectifier is made to be of a relatively small capacity, a resonance circuit is formed by a primary winding of a transformer and a second capacitor, first and second switching elements connected in parallel to a smoothing capacitor are alternately made ON and OFF to cause currents to flow, a both-end voltage of the first capacitor drops to be substantially close to zero volt even in a period in which a source voltage of an AC power source becomes substantially zero, and an input current can be drawn in smoothly over the entire range of a cycle of the source voltage of the AC power source, whereby higher harmonics of the input current can be reduced, a pulsation of the current flowing to a load can be minimized, and required number of parts for the power source device is reduced to be able to realize circuit simplification and cost reduction.

REFERENCES:
patent: 4564897 (1986-01-01), Okamoto et al.
patent: 5459651 (1995-10-01), Maehara
patent: 5737207 (1998-04-01), Uratani et al.
patent: 5764496 (1998-06-01), Sato et al.
patent: 5777861 (1998-07-01), Shimizu et al.
patent: 5875107 (1999-02-01), Nagai et al.

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