POWER-SUPPLY UNIT FOR INDUCTION HEATING DEVICE, INDUCTION HEATING DEVICE, AND HOT METAL HOLDING FURNACE

摘要

PPROBLEM TO BE SOLVED: To avoid high-voltage overcurrent trip, even with respect to temporary sudden change in the inductance of the system as a whole, including an induction heating device and a heating object by expanding the variable range of capacitor capacitance, using a simple and low-cost constitution. PSOLUTION: In this power-supply unit 100 of an induction heating device, equipped with a capacitance-fixed capacitor group 130F and a capacitance-variable capacitor group 130V, a part of the capacitance-fixed capacitor group 130F can be separated collectively from a circuit by a manual switch (for instance, a high-voltage disconnector 142). PCOPYRIGHT: (C)2008,JPO&INPIT