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Abstract
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In this paper, a new method for driving magnetron for a sulfur plasma tube is presented using the two-switch forward converter structure with a phase-shifting active clamp (1000±40 W, 285 mA, 4 kV). Depending on the output voltage level required, the Magnetron Driver Circuit (MDC) is boosted and insulated and also has high gain. The use of the two-switch forward converter reduces the transistor voltage stress. In addition, applying the clamp structure balances the magnetization current. Besides, by controlling the phase shift of the clamp transistor, while maintaining the magnetic current balance of the power transformer, the duty cycle of the main transistors can be increased. This allows more voltage level transfer to the secondary winding of the transformer. Therefore, with a fixed transformer core, more voltage transmission is possible in comparison with a conventional forward converter.
Moreover, using the PFC converter improves the power factor and stabilizes the DC-link voltage. The MDC provides a maximum power of 1 kW with an average power of 125-250 W by adjusting the converter's active time under minimum loss conditions. The MDC provided is validated by the simulation and experimental results.
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