Series-compensated inductor type resonant inverter using pulse density modulation scheme for efficient ozonizer
This paper presents a high-frequency voltage source-fed load-resonant IGBT inverter with a series-compensated resonant inductor for ozonizer power supply, which is characterized by the power control strategy on the basis of pulse density modulation (PDM). The inverter system configuration illustrated through the circuit modeling of the silent discharge-based ozone generating tube and high-voltage transformer. The state-of-the art ozonizer using a high-frequency load resonant inverter is demonstrated and its operating principle of the voltage-fed load-resonant inverter are described for the ozone generating tube. It is noted that the pulse density modulated series resonant high-frequency inverter using IGBTs makes an ozonizer power control scheme simple as well as improves the ozone generating characteristic. Thus, it is effective in improving the ozone producer efficiency. Finally, it is proved that the series load-resonant inverter type ozonizer developed in this paper provides stable silent discharge characteristics over a wide output power range from 10% to 100%.