Power supply apparatus with improved efficiency

Details Power supply apparatus with improved efficiency Power supply apparatus with improved efficiency

1996-08-29

1997-12-30

Hecker, Stuart N.

Electric power conversion systems

Current conversion

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

363 21, H02M 3335

Patent

active

057037639

ABSTRACT:
A power supply apparatus including at least one coil and a controllable switching element and a peak-limiting circuit for limiting the maximum voltage across the switching element. The peak-limiting circuit includes a capacitor and a series connection of a first rectifier element and a resistor, as well as a second rectifier element which connects one end of the series connection to the positive input terminal of the apparatus. The energy dissipation in the resistor is dependent on the duty cycle of the switching element. The duty cycle in turn is dependent on the load of the power supply apparatus. Consequently, when the load of the power supply apparatus is small, the dissipation of the apparatus will be substantially lower.

REFERENCES:
patent: 4313155 (1982-01-01), Bock et al.
patent: 5117347 (1992-05-01), Rebello et al.
patent: 5383106 (1995-01-01), Yoshida et al.
patent: 5513088 (1996-04-01), Williamson
patent: 5535112 (1996-07-01), Vazquez Lopez et al.
patent: 5621623 (1997-04-01), Kuriyama et al.
patent: 5621625 (1997-04-01), Bang

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