US RE40,016 E1
Power factor correction control circuit
Thomas J. Ribarich, Laguna Beach, Calif. (US); Robert Marenche, Torrance, Calif. (US); and Dana S. Wilhelm, Temple City, Calif. (US)
Assigned to International Rectifier Corporation, El Segundo, Calif. (US)
Filed on Jun. 18, 2004, as Appl. No. 10/870,901.
Application 10/870901 is a reissue of application No. 09/613252, filed on Jul. 10, 2000, now 6,259,614, filed on Jul. 10, 2001.
Claims priority of provisional application 60/142949, filed on Jul. 12, 1999.
Int. Cl. H02M 7/04 (2006.01); H02M 1/12 (2006.01); G05F 1/652 (2006.01)
U.S. Cl. 363—89  [363/44; 323/222; 323/284] 12 Claims
OG exemplary drawing
 
1. A power factor control circuit for an AC to DC power converter, the circuit comprising:
an inductor configured to receive AC rectified power [ from an AC line input voltage] ; and
a switching circuit connected to the inductor and including a switch for switching current through the inductor on and off;
the switching circuit controlling the on-time of the switch, and thereby the charging time of the inductor, by comparing a DC bus voltage to a fixed reference voltage,
the switching circuit controlling the off-time of the switch, and thereby the discharging time of the inductor, by turning the switch off until the inductor current discharges to zero, as detected by the switching circuit, such that the off-time of the switch varies as a function of the peak inductor current during each switching cycle [ ,
wherein the on-time of the switch is controlled to be longer at the zero crossings of the AC line input voltage thereby to achieve lower total harmonic distortion] .