周波数可変部分共振インバータによる誘導加熱装置の周波数・電力制御 [in Japanese] Frequency and Power Control of Induction Heater using an Adjustable Frequency Quasi-Resonant Inverter [in Japanese]
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It is to be desired that the operating frequency of a resonant inverter for induction heating is adjustable when various parts or uneven parts are treated by heating. In order to respond the demand, we reported a novel adjustable frequency quasi-resonant inverter and clarified the basic characteristics. However, the output current contained many harmonics and there was the possibility that the heat-treated depth in the uneven surface of the work did not become uniform unless the operating condition was optimum. The heat-treated depth depends on not only output frequency of the inverter but supplied power into the work coil. If the frequency and the supplied power can be controlled independently, the degree of freedom of the heat treated depth control increases. Therefor, we propose a frequency and power control method using the reported inverter. In the present method, the inverter and the induction heater are considered as a series RLC resonant circuit which includes an equivalent loss resistor and an equivalent output resistor. The input DC voltage of the inverter is so manipulated that the output power generated in the output resistor may be equal to the desired value after the operating frequency was controlled to the target value.
- IEEJ Transactions on Sensors and Micromachines
IEEJ Transactions on Sensors and Micromachines 118(3), 377-384, 1998-03
The Institute of Electrical Engineers of Japan