Power control unit

Details Power control unit Power control unit

1997-09-10

1999-03-09

Hecker, Stuart N.

Electricity: power supply or regulation systems

Output level responsive

Zero switching

323300, G05F 110, G05F 500

Patent

active

058805788

ABSTRACT:
In a power control unit for controlling a power supply to a load connected to an AC power source by switching on half cycles, following three modes are carried out in the order of presented: a first control mode for continuously supplying a power which is composed of a plurality of half cycle switching waveforms of a first polarity to said load; a second control mode for continuously supplying a power which is composed of a plurality of half cycle switching waveforms of a second polarity to said load, said second polarity being different from said first polarity; and a third control mode for supplying a power of a half cycle of said first polarity and a power of a half cycle of said second polarity to said load in turn. This arrangement can attain an effect that both the harmonic noises and the flickers caused by a rush current are reduced.

REFERENCES:
patent: 4328459 (1982-05-01), McLeod, Jr.
patent: 5030890 (1991-07-01), Johnson
patent: 5079409 (1992-01-01), Takada et al.
patent: 5481089 (1996-01-01), Furuta
patent: 5483149 (1996-01-01), Barrett
patent: 5747972 (1998-05-01), Baretich et al.
patent: 5796245 (1998-08-01), Beaulieu et al.

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