| Abstract |
A single-ended parallel-resonant DC-DC Converter has been analysed and its suitability assessed for application as a high voltage pre-converter for RF induction heaters. A design procedure has been fomulated and an example is given of a 3kW dc- dc converter. This design has been simulated using a circuit simulator program called PSPICE. Finally, a prototype has been built and tested to verify the theoretical results. At its maximum operating frequency of 40kHz, the prototype converter delivers a peak output power of 3kW with an output voltage of 3kV. It achieves a wide range of output power control (3kW - 460W) by changing the converter operating frequency in a band between 40kHz and 20kHz. The converter input current waveform, drawn from the 240V mains supply, is nearly sinusoidal and the power factor approaches unity. Experimental results presented show close correspondence with theoretical predictions . |
