| 摘要 |
PROBLEM TO BE SOLVED: To suppress a circuit current and enable to drive at the optimal condition regardless of temperature variations. SOLUTION: The output of a DC power supply 1 is supplied to a coil L3 of a load circuit 2 by being reversed in polarity by switching transistors Q1, Q2. Faradaic flows to a heating roller constituting the load current 2 by a resonance current generated in a parallel resonance circuit by the coil L3 and a capacitor C1, and the heating roller is heated. On the other hand, a feedback coil L4 is magnetic coupled to the coil L3 and a feedback current is generated in the feedback coil 4. This feedback current is fed back to the transistors Q1, Q2 and drives the transistors Q1, Q2 in self excitation. Therefore, the switching on and off of the transistors Q1, Q2 is controlled according to the variations of resonance frequency based on the heating of the load circuit, and drive is performed at optimal condition regardless of the temperature variations. COPYRIGHT: (C)2006,JPO&NCIPI
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