Feedback control system for a high-efficiency class-D power ampl

Details Feedback control system for a high-efficiency class-D power ampl Feedback control system for a high-efficiency class-D power ampl

1990-12-21

1991-11-05

Laroche, Eugene R.

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Induction-type discharge device load

315311, 315284, 330207A, H05B 4124

Patent

active

050633325

ABSTRACT:
A closed-loop control system for a Class-D power amplifier circuit, having a variable output resonant circuit impedance, maintains high-efficiency operation by using the phase angle between the resonant load voltage and current to control tuning of the resonant circuit. The resonant load circuit voltage and current are supplied to a phase detector for detecting the phase angle therebetween and for generating a voltage proportional thereto. The output voltage from the phase detector is compared to a reference voltage by an error amplifier. The resulting error voltage is employed as the input signal to control circuitry for tuning the output resonant circuit. Such a control system is suitable for maintaining high-efficiency operation of an electrodeless high intensity discharge lamp system.

REFERENCES:
patent: 3662216 (1972-05-01), Hildebrant
patent: 3899745 (1975-08-01), Fletcher
patent: 4180764 (1979-12-01), Morup
patent: 4383203 (1983-05-01), Stanley
patent: 4571551 (1986-02-01), Trager
patent: 4628275 (1986-12-01), Skipper
patent: 4783615 (1988-11-01), Dakin
patent: 4812702 (1989-03-01), Anderson

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