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Traditional EDM power supplies convert the energy at low frequency, directly from the utility line and they are able to deal with a wide spectrum of output power. The EDM power supply must achieve high voltage to generate the spark and large current to maintain the ion column. To achieve this, large and heavy transformers and inductances are required. Resonant converters are desirable for power conversion...
In this paper, a new control strategy that allows zero-voltage-switching (ZVS) operation of power converters using piezoelectric transformers (PTs) is proposed. The control circuit operates in a closed loop by measuring the phase between the PTs resonant current and the switching pattern and adjusting the switching frequency to the optimum value so that ZVS operation is assured. An innovative nonlinear...
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