Importance

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Abstract

An RF dielectric heater has a variable power output and stable output frequency. A power controller provides variable phase angle control of three-phase AC power. A delta-wye power transformer is coupled between the power controller and a rectifier circuit. The rectifier circuit converts the stepped up, high voltage AC power from the transformer into a DC power output. An RF oscillator circuit driven by the DC power output is coupled to a tank circuit. A load, comprising RF electrodes, create an RF field to heat material passed through the field. The RF electrodes are coupled to the tank circuit in a manner characterized by the absence of any tuning components.

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First Claim