Electric heating – Inductive heating – With power supply system
Patent
1995-09-08
1997-08-26
Leung, Philip H.
Electric heating
Inductive heating
With power supply system
219665, 219666, 219667, 219671, H05B 608
Patent
active
056607547
ABSTRACT:
The load balancer incorporates link coil circuits that inductively couple to induction heating coils, which are connected in parallel across a power source. A capacitor is electrically connected in the link coil circuit. By varying degree to which the link coil is inductively coupled to the heating coil or by changing the capacitance, either using a variable capacitor or switching among different capacitors, changes in the amount of reactance coupled into the heating coil are effected. Thus, the current in the corresponding heating coil can be varied, enabling adjustment of the heating of the workpiece. Accordingly, the resulting system is efficient since only a single coil rather than multiple series coils are used. This aspect can be enhanced when litz cable is used in coil construction. Further, the system is compatible with active control.
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Leung Philip H.
Massachusetts Institute of Technology
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