Power factor correction circuit for power supplies

Details Power factor correction circuit for power supplies Power factor correction circuit for power supplies

1989-09-01

1990-10-02

Stephan, Steven L.

Electricity: power supply or regulation systems

For reactive power control

323208, 363 44, G05F 306

Patent

active

049610449

ABSTRACT:
A power factor correction circuit for an AC to low voltage DC power supply designed to be connected to a source of AC power includes a linear transformer having primary and secondary windings, and a capacitor. In use, the primary winding is electrically connected in series with and between the AC power source and the power supply, and the capacitor is electrically connected in series with the secondary winding across the power supply, between the primary winding and the power supply. The inductance value of the primary winding is selected to remove odd harmonics from the line current drawn by the load represented by the power supply on the AC power source, and the capacitance value of the capacitor is selected to provide the reactive power load demand of the power supply. The turns ratio between the secondary winding and the primary winding of the transformer is selected to eliminate the loss of power supply operating line range caused by the voltage drop across the primary winding. The voltage regulation by the power supply is achieved with improved power factor and reduced radio frequency interference.

REFERENCES:
patent: 2367625 (1945-01-01), Short
patent: 4119907 (1978-10-01), Quinn
patent: 4212053 (1980-07-01), Sichenzia
patent: 4222096 (1980-09-01), Capewell
patent: 4369490 (1983-01-01), Blum
patent: 4672522 (1987-06-01), Lesea
patent: 4795959 (1989-01-01), Cooper
patent: 4930061 (1990-05-01), Slack et al.

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