AC/DC unity power-factor DC power supply for operating an electr

Details AC/DC unity power-factor DC power supply for operating an electr AC/DC unity power-factor DC power supply for operating an electr

1994-09-09

1995-11-28

Martin, David S.

Electricity: motive power systems

Induction motor systems

Primary circuit control

318729, 318762, 318811, H02P 534

Patent

active

054711258

ABSTRACT:
A unity power factor power supply for an electric motor. A switch-mode circuit is employed which, in a first mode, transfers power from AC main to a constant voltage DC bus. In a second mode, power generated on the DC bus is fed back to the main power supply. The circuit of the invention automatically maintains the DC bus voltage constant and sets an adequate operation mode by processing the DC bus voltage signal. In both operation modes, the unity power factor and sinusoidal waveform of the AC main side are maintained.

REFERENCES:
patent: 4319177 (1982-03-01), Kawada et al.
patent: 4697131 (1987-09-01), Schauder et al.
patent: 4761600 (1988-08-01), D'Atro et al.
patent: 4764713 (1988-08-01), D'Atro
patent: 4902954 (1990-02-01), Oshima et al.
patent: 4959602 (1990-09-01), Scott et al.
patent: 5070290 (1991-12-01), Iwara et al.
patent: 5283507 (1994-02-01), Stitt et al.

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