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In this paper, a novel prototype of pulse density modulated voltage source high-frequency resonant inverter using IGBT modules is presented for driving a silent discharge (SD) type ozone generating tube. An optimum design procedure of the series resonant inductor, which compensates the capacitance of the ozone generating tube, is described. The effective power regulation scheme, which is based on PDM (Pulse Density Modulation) and PWM (Pulse Width Modulation) hybrid control strategy implemented on DSP, and characteristics of this ozone generating tube load are illustrated. The effectiveness of this high-frequency inverter type ozonizer is proved in experiment, together with the simulation results.

Voltage-Fed Pulse Density and Pulse Width Modulation Resonant Inverter for Silent Discharge Type Ozonizer