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Multiple-zone-induction-coil-power-control-apparatus-and-method

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Multiple zone induction coil power control apparatus and method

Details

Inventors: Boehm, Paul C.; Mortimer, John H.; Rowan, Henry M.; Turner, Robert C.;
Assignee: Inductotherm Industries Inc. (Rancocas, NJ)
Primary Examiner: Leung; Philip H.
Assistant Examiner:
Attorney, Agent or Firm: Seidel, Gonda & Goldhammer

A plurality of zones of an induction heating coil are individually controlled by varying the current through one or more zones of the coil to obtain a desired temperature profile in a workpiece. The current flow through a zone of the coil is determined by the conduction state of an associated saturable reactor, which is controlled in accordance with a preselected value or a variable value generated, for example, by a computer.

DETAILED DESCRIPTION The present invention is an apparatus for individually controlling power delivered to each of a plurality of zones of an induction heating coil so as to provide a desired temperature profile in a workpiece heated by the coil.
The apparatus comprises a high-frequency induction power supply for delivering power to the coil and means for measuring the power in each zone.
The apparatus also comprises means for comparing the power in each zone to a predetermined reference and generating a first control signal based on the comparison and means operatively associated with each zone in response to the first control signal for diverting electric current around that zone to thereby control the power delivered to the zone.
The apparatus further comprises means for determining the total power delivered by the power supply, means for adding the power in each zone to determine the total power in all zones, and means for comparing the total power in all zones to the total power delivered by the power supply and generating a second control signal based on the comparison for controlling the total power delivered by the power supply.
The present invention also includes a method for individually controlling the power delivered to each of a plurality of zones of an induction heating coil so as to provide a desired temperature profile in a workpiece heated by the coil.
The method comprises the steps of delivering high frequency power to the coil, measuring the power in each zone of the coil, comparing the power in each zone to a predetermined reference and generating a first control signal based on the comparison, diverting electric current around that zone in response to the first control signal to thereby control the power delivered to that zone, determining the total power delivered to the coil, adding the power in each zone to determine the total power in all zones to the total power delivered to the coil and generating a second control signal based on the comparison for controlling the total power delivered to the coil

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