Induction heater
Means of power control

Power control for the system can be achieved by a variety of methods. Many latter day units feature thyristor power control which works by means of a full-wave AC (alternating current) drive varying the primary voltage to the input transformer. More traditional methods include three-phase variacs (autotransformer) or motorised Brentford type voltage regulators to control the input voltage. Another very popular method was to use a two part tank coil with a primary and secondary winding separated by an air gap. Power control was affected by varying the magnetic coupling of the two coils by physically moving them relative to each other.
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