Optimization of electrodeless systems.

摘要

A treatise on the optimization of a 2.5 MHz electrodeless fluorescent lighting system is presented. Emphasis is placed on the identification of the plasma parameters and a novel method of synthesizing the amplifier components that yields peak efficiency.;Maxwell's equations establish the minimum nominal model of the RF coil loaded by the ion-electron plasma. The lamp model contains the internal, external and inertial inductance of the plasma, its resistance and the coupling to the reentrant coil. These parameters are found by an empirical technique based upon the theory of concentric solenoids.;Mathematical models of the switch-mode power amplifier are derived via a multiple boundary value method. This method relies on the continuity of the state variables over temporal boundaries that occur at the switching intervals. Both the hard-switching and the soft-switching cases are illustrated. The models are coded into a constrained optimizer, based upon the Outside Penalty Method, to synthesize the amplifier parameters. The optimized physical model achieves an efficiency greater than 90% at 2.5 MHz.;The environmental aspects of the electrodeless lighting system, with emphasis on power quality, are considered. A cost effective method of reducing the harmonics, generated by the nonlinear conversion from ac to the dc bus, is investigated.