Power supply circuit for electrical apparatus

Details Power supply circuit for electrical apparatus Power supply circuit for electrical apparatus

1980-03-12

1982-03-23

Shoop, William M.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

323217, 323237, H02P 1324

Patent

active

043216625

ABSTRACT:
In a power supply circuit for an electrical apparatus, comprising a power transformer having its secondary winding connected to a smoothing capacitor via a rectifying circuit and having its primary winding adapted to be applied with an ac voltage, a switching means is provided for applying the ac voltage to the primary winding only for a selected period of time in a half cycle of this ac voltage and for terminating the application of this ac voltage before an arrival of a zero crossing point of the ac voltage, whereby allowing a voltage of a time length corresponding to a current flowing through the secondary winding to be applied to the primary winding of the transformer, to thereby inhibit a flow of unnecessary exciting current to the primary side. This power supply circuit also contributes to stabilization of the dc output voltage of the power supply circuit.

REFERENCES:
patent: 3466527 (1969-09-01), Sun Chun
patent: 3506905 (1970-04-01), Thomas
patent: 3541421 (1970-11-01), Buchman
patent: 3723849 (1973-03-01), Ludloff
patent: 4051425 (1977-09-01), Smith

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