Resonant frequency induction furnace system using capacitive vol

Details Resonant frequency induction furnace system using capacitive vol Resonant frequency induction furnace system using capacitive vol

1999-11-08

2000-12-19

Walberg, Teresa

Electric heating

Inductive heating

With power supply system

363 98, 363 62, 363131, 363 95, 373147, 373148, 373149, 373150, 219661, 219662, 219663, 219664, 219665, 219666, H05B 604, H05B 606, H02M 324

Patent

active

061630195

ABSTRACT:
An induction furnace having a voltage source series inverter, a load circuit having a combination of an induction coil and a resonating capacitor bank, and control circuitry to phase lock the inverter frequency to the natural resonant frequency of the load. The capacitor bank can be divided into two groups, one across the output of the inverter and the other in series with the load. This arrangement allows for the division of the inverter voltage across the furnace coil according to the ratio of the two capacitances. The inverter uses pulse width modulation and is buffered from the load circuit by means of a small series connected inductor. Additionally, the system can have a common power supply system that supplies power in any desired proportion to a plurality of induction furnaces.

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