Flyback Based Resonant Converter for High Voltage Pulsed Load Application

Abstract

This paper focuses on a flyback based resonant converter topology for obtaining a pulsed high voltage for low power applications like ozone generators. In this paper, a flyback based resonant converter is proposed in order to obtain a variable pulsed output voltage ($\mathbf{2}.\mathbf{5}\ \mathbf{kV}-\mathbf{10}\ \mathbf{kV}$) fed from an input voltage of 230 V, 50 Hz AC supply. Ozone generators are low power applications with the pulse repetitive rate limited to 1 kHz to 5 kHz and the pulse width limited to $\mathbf{10}\ \mu\mathbf{s}$ to $\mathbf{30}\ \mu\mathbf{s}$. For ozone generation, the oxygen is passed through a dielectric barrier discharge chamber, which is subjected to a high voltage across its electrodes which supply the energy for the micro discharges to take place. In this paper, the high voltage pulses are obtained through a resonant circuit topology with a transformer in the output stage to boost the output voltage and give isolation. The resonant capacitor is charged through a flyback circuit after every switching instant of the resonant circuit to the desired voltage magnitude, ensuring charging time constraint. In the proposed work, the high voltage pulses of desired voltage magnitude with pulse repetitive rate and pulse width are designed and validated through simulation results.