Resonant frequency induction furnace system using capacitive voltage division
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United States of America Patent
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Dec 19, 2000
Grant Date -
N/A
app pub date -
Nov 8, 1999
filing date -
Mar 5, 1999
priority date (Note) -
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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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