H - Electricity – 05 – B
Patent
H - Electricity
05
B
H05B 41/24 (2006.01) H03F 3/217 (2006.01) H05B 41/28 (2006.01)
Patent
CA 2056539
RD-20,720 FEEDBACK CONTROL SYSTEM FOR A HIGH- EFFICIENCY CLASS-D POWER AMPLIFIER CIRCUIT 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.
Borowiec Joseph Christopher
El-Hamamsy Sayed-Amr Ahmes
Company General Electric
Craig Wilson And Company
LandOfFree
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