Electric heating – Inductive heating – With power supply system
Patent
1998-05-29
2000-06-20
Walberg, Teresa
Electric heating
Inductive heating
With power supply system
H05B 604
Patent
active
060780339
ABSTRACT:
An induction heating system having at least one power supply switching network is disclosed to provide selective power control to multiple zones of an induction heating coil to achieve a desired heat distribution in a workpiece. The power supply switching network includes a number of bidirectional switches, each connected in series with one another, and each connected in parallel with a portion, or zone, of an induction heating coil. The bidirectional switches are controlled by a computer that supplies a control signal having a duty cycle as determined by the computer and a multi-zone feedback circuit. By splitting the coils and inserting a switch in parallel with each coil, and each switch in series with one another, the coil is effectively split into multiple series connected coils, thereby being more effectively controllable while avoiding physical alterations to the heating coil. The present invention can therefore compensate for inconsistent characteristics in any particular coil by effectively regulating the power to each section, or zone, thereby regulating the heat applied to the workpiece.
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Bowers Thomas J.
Der Chuck F.
Parker James D.
Pillar Industries, Inc.
Pwu Jeffrey
Walberg Teresa
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