Advanced development of voltage source soft-switching high-frequency inverter for silent discharge tube loads

Ozone utilizing technologies, ultraviolet light and excimer laser applications are spreading very rapidly and have tends to enter daily life as small-size desinfection, ozonation devices etc. Since silent discharge in gas has been recognized as one of the most effective ways for ozone, ultraviolet and excimer laser generation, the development of low cost and high effective driver for silent discharge load becomes the task of great importance. This paper presents a switched-mode power supply designed for such type of load. Introduced here is a voltage source type resonant inverter, operating under ZVS (zero voltage switching) principle and developed for driving a silent discharge (SD) type high-frequency ozone generation tube. Applied in this inverter, a PDM (pulse density modulation) and PFM (pulse frequency modulation) hybrid control strategy allows to achieve zero voltage switching in all power regulating ranges (10-100%) that reduces total switching losses and EMI noises and increases total system efficiency.