A novel pulse-density-modulated high-frequency inverter for silent-discharge-type ozonizer

This paper presents a novel prototype of a voltage-source load resonant inverter using insulated gate bipolar transistors for driving a silent-discharge-type ozone-generation tube. Ozone-generation technology has a history of more than 100 years and ozonization has been recognized as one of the best methods for water treatment, desinfection, industrial wastes utilization, and so on. However, some technological difficulties related to efficient ozone production and high cost of the ozone-generating equipment have been significant problems restricting ozone usage in the industrial plants. Introduced in this paper is a pulse-density-modulated high-frequency inverter for a silent-discharge-type ozonizer, which is developed with the aim to improve power conversion and control characteristics of the ozone generation by using advances in power electronic technology. The developed system implements the feedforward control-based pulse-density-modulation control scheme with pulsewidth-modulation feedback control strategy to compensate temperature and other environmental influences on ozone gas output.