Method of crosstalk reduction for multi-zone induction heating systems
AssigneeHoneywell ASCa Inc.
InventorsNicholas Dohmeier, Keith McCormick
Life of this patent
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Abstract
Reduction of crosstalk between induction heating coils in an induction heating apparatus and particularly to reduction of crosstalk in a multi-zone induction heating system provides greater reliability for the power modules.
Claims10
A method for controlling the annular phase of a plurality of alternating currents wherein each of the alternating currents is applied to a respective one of a plurality of adjacently disposed induction coils comprising the steps of:
- developing each one of the currents from a respective one of a plurality of power modules such that each one of the currents has a frequency substantially similar to the frequency of each other one of the currents;
- applying a synchronization pulse to each of the power modules;
- detecting continuously in each one of the currents developed by each respective one of the power modules whether a distortion has been induced in any one of the currents as a result of magnetic field interference in the respective one of the induction coils to which the current in which the distortion is detected is applied wherein the magnetic field interference results from a magnetic field developed by the current in an adjacent one of the induction coils;
- and
- shifting in the event a distortion is detected in one of the currents the phase of a selected one of the current in which the distortion is detected and the current which is applied to the adjacent one of the induction coils, wherein the phase of the current developed by each respective of the power modules is relative to the synchronization pulse applied to each of the power modules, until the distortion is substantially eliminated whereby magnetic field induced crosstalk between the adjacent ones of the induction coils is mitigated.
In a multi-zone induction heating system having a plurality of power module sections to which a current from a power source is applied and a plurality of work coils, each of said work coils being associated with a respective one of said power module sections which develops an alternating work coil current for said associated one of said work coils wherein each alternating current developed by each one of the power module sections has a frequency substantially similar to the frequency of the alternating current developed by each other one of the power module sections, a method for controlling the angular phase of each alternating work coil current comprising the steps of:
- applying a synchronization pulse to each of the power modules;
- detecting continuously in the work coil current developed by each respective one of said power module sections whether a distortion has been induced in any one work coil current as a result of magnetic field interference in the respective one of the work coils to which the current in which the distortion is detected is applied wherein the magnetic field interference results from a magnetic field developed by the current in an adjacent one of said work coils;
- and
- shifting in the event a distortion is detected in any one work coil current the phase of a selected one of said work coil current in which the distortion is detected and the current which is applied to the adjacent one of said work coils, wherein the phase of the current developed by each of the power module sections is relative to the synchronization pulse applied to each of the power module sections, until the distortion is substantially eliminated whereby magnetic field induced crosstalk between the adjacent ones of the induction coils is mitigated.
Dependencies are inferred from the claim text.