Display monitor power supply apparatus with a power factor corre

Details Display monitor power supply apparatus with a power factor corre Display monitor power supply apparatus with a power factor corre

1997-03-31

1999-05-18

Saras, Steven J.

Computer graphics processing and selective visual display system

Display driving control circuitry

Display power source

363 41, 39575004, G09G5/00

Patent

active

059054913

ABSTRACT:
A power supply apparatus for a display monitor includes a power factor correction circuit coupled to receive a primary voltage, for correcting a power factor of said primary voltage and generating a secondary voltage; a switch operable in response to a pulse signal; a switch control circuit for generating said pulse signal; a transformer including a primary winding and secondary windings connected to each other by mutual induction, in which the primary winding has a first terminal coupled to receive the secondary voltage and a second terminal connected to the switch, and in which the transformer is being supplied with primary induced voltage when the pulse signal has a primary duty ratio and supplied with secondary induced voltage lower than the primary induced voltage when the pulse signal has a secondary duty ratio; a rectifier for rectifying the primary and secondary induced voltages; and a smoothing circuit for smoothing an output voltage of the rectifier for application to the power factor correction circuit.

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patent: 5481732 (1996-01-01), Shahbazi
patent: 5483464 (1996-01-01), Song
patent: 5734562 (1998-03-01), Redl

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