-This paper presents the considerations of driving the Adjustable Frequency QuasiResonant Inverter Circuit in the high frequency. This inverter is requested to output frequency from 160kHz to 400kHz. Resonant inverter used for metalworking by the induction heating. In induction heating, high frequency can heat the shallow point, and low frequency can heat the deep point. So when heated depth is replaced, the frequency that inverter must output is different. It is necessary for the inverter to output two or more frequencies. In addition, in the heat-treatment called the hardening, only the metal surface must be heated. So, to heat-treat metal that a radius is small, it is necessary for the inverter to output high frequency. This inverter can output the frequency more than 100kHz by using Power Metal Oxide Semiconductor Field Effect Transistor (MOSFET) as power device. The circuit includes the first resonant capacitor and second one with a one-way short-circuit switch. Because synthetic series capacitance is varied by manipulating the switch, this inverter can change a period during a half period. We confirmed this inverter can output an arbitrary frequency by the experiment.
This study aims to explain the relation between the local fire prevention act and diffusion of mud-walled town houses in Nagano Prefecture. The act being put into operation in 1888 just after the great fire in Matsumoto city and lasted until 1890, referred to those of Tokyo in 1881 and Toyama in 1887, however contains its own elements. For example, it targeted only new buildings. In Matsumoto, one of the targeted cities among six, it is identified that mud-walled town houses were built after the local act in the burned district where few mud-walled houses existed before the fire.
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