Patent ID: 7212421

Claim:
A combination controller for a feedback system comprising: a first controller for regulating a steady state value of an amplified output voltage signal of said combination controller, said first controller receiving first and second voltage inputs, said first voltage input comprising a reference DC voltage (V ref ) and said second voltage input comprising said amplified output voltage signal of said combination controller (V O ), and said first controller generating a steady state error correction signal (E SS ) therefrom; a second controller cooperating with said first controller and configured to receive said steady state error correction signal (E SS ), a reference sinusoidal voltage (V ref Sin A ), said amplified output voltage signal of said combination controller (V O ), a current signal corresponding to a pre-load filter capacitor (I C ), and an output current signal (I L ), and said second controller generating a transient response error signal (E T ) therefrom; and a third controller cooperating with said second controller and configured to receive said transient response error signal (E T ), said third controller generating a constant frequency pulse width modulated (PWM) sinusoidal voltage signal.