Power circuit

Details Power circuit Power circuit

1993-01-28

1994-08-30

Stephan, Steven L.

Electric power conversion systems

Current conversion

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

363 37, 363 40, H02M 3335

Patent

active

053433785

ABSTRACT:
In a switching power supply circuit, a large capacity second capacitor is provided in parallel with a smoothing capacitor. When the charging voltage of the smoothing capacitor is larger than that of the second capacitor and energy is discharged from the smoothing capacitor, accumulations of exciting energy of a transformer in the second capacitor during OFF state of a switching MOS transistor is controlled, and when the charging voltage of the smoothing capacitor is smaller than that of the second capacitor and energy is discharged from the second capacitor, accumulations of the exciting energy of a transformer in the smoothing capacitor during OFF state of the MOS transistor is controlled. Moreover, an exciting current from either the smoothing capacitor or the second capacitor is selectively supplied by a two-diode circuit to the smoothing capacitor or the second capacitor, depending on the levels of the voltages of the smoothing capacitor and the second capacitor.

REFERENCES:
patent: 4523139 (1985-06-01), Schwarz et al.
patent: 4706009 (1987-11-01), Schwarz
patent: 5019955 (1991-05-01), Hoeksma
patent: 5168435 (1992-12-01), Kobayashi et al.
patent: 5200886 (1993-04-01), Schwarz et al.
patent: 5208432 (1993-05-01), Han
patent: 5222015 (1993-06-01), Nakagawa
patent: 5227964 (1993-07-01), Furuhata
Hirokazu Tohya, "Reduction of the Harmonics and Correction . . . Factor in the Switching Regulator", Proceedings of Chinese-Japanese Power Electronics Conference, Sep. 13-14, 1992, pp. 474-481.

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