Simplified active power factor correction controller IC

Details Simplified active power factor correction controller IC Simplified active power factor correction controller IC

1996-11-15

1998-10-06

Sterrett, Jeffrey L.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

323210, 323222, 323285, G05F 170

Patent

active

058187073

ABSTRACT:
Disclosed is an active power factor correction integrated circuit for a boost converter, comprising a bias voltage generator coupled to an external power source through a first pin, for generating internal bias voltages used for the integrated circuit; a zero crossing detector coupled magnetically to the inductor through a second pin, for detecting a time at which a voltage across the inductor is zero to provide a zero crossing detection signal; an oscillator reset by the zero crossing detection signal for generating a pulse signal; a flip-flop for generating a first control signal in response to the zero crossing detection signal or the pulse signal; a switching element responsive to the first control signal for enabling a boosted voltage to be provided to the load; an over-current detector for generating an over-current signal when a current flowing through the switching element is over a predetermined value; and a voltage variation detector for detecting variation of a load voltage to generate a variation detection signal and generating a second control signal enabling the boosted voltage to flow through the switching element to a ground in response to both the variation detection signal and the over-current signal. With the integrated circuit, the number of the IC pin and the number of the peripheral components thereof may be considerably reduced.

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patent: 5508602 (1996-04-01), Borgato et al.
patent: 5644214 (1997-07-01), Lee

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