Patents Assigned to Food Rethermalization Ltd.
  • Patent number: 4908489
    Abstract: The present invention is an improved induction heating apparatus and more particularly a improved oscillation control circuit. The induction heating apparatus includes at least one induction coil, with a parallel capacitance forming an LC oscillation circuit. A set of at least one semiconductor switching devices enables a power source to be coupled to the LC oscillation circuit. This power source is preferably a half wave rectified AC voltage. A control circuit periodically switches ON the semiconductor switching devices to couple the half wave rectified AC voltage to the LC oscillation circuit thereby stimulating electrical oscillations. The control circuit includes an initialization circuit for inhibiting the first coupling of the half wave rectified AC voltage to the LC oscillation circuit while the half wave rectified AC voltage is greater than a predetermined amount.
    Type: Grant
    Filed: March 31, 1988
    Date of Patent: March 13, 1990
    Assignee: Food Rethermalization Ltd.
    Inventors: Frank Panecki, Timothy Satawa, Leon Brank