US 6,982,547 B2
Power factor controlled regulator with variable output voltage feedback
Richard Haas, 10555 Fellar Cove, San Diego, Calif. 92126 (US)
Filed on Dec. 12, 2003, as Appl. No. 10/735,337.
Application 10/735337 is a continuation in part of application No. 10/199646, filed on Jul. 20, 2002, granted, now 6,664,769.
Prior Publication US 2004/0124820 A1, Jul. 01, 2004
Int. Cl. G05F 1/70 (2006.01)
U.S. Cl. 323—207 4 Claims
OG exemplary drawing
 
1. A variable amplitude voltage regulator for use in a power factor correction system including in combination:
a resistor scaling network consisting of at least one variable resistor comprising at lease one bi-polar transistor having a base, an emitter, and a collector, the collector emitter path of which is connected in parallel with a fixed resistance;
a source of rectified alternating current input voltage (ACR) coupled to the resistor scaling network;
a voltage error differential amplifier coupled to the ACR and to a reference signal to produce a voltage error signal (VES);
a digital signal processing (DSP) circuit;
means coupling the VES to the DSP to produce an output signal at a predetermined frequency with an adjustable duty ratio (DR);
means coupling the ACR with the collector emitter path of the transistor and the output signal from the DSP to the base of the transistor to produce a demand level control signal which varies as a function of the VES dc level.