Electric heating – Inductive heating – With power supply system
Reexamination Certificate
2007-06-12
2007-06-12
Robinson, Daniel (Department: 3742)
Electric heating
Inductive heating
With power supply system
C307S014000
Reexamination Certificate
active
11474310
ABSTRACT:
It is an object of the present invention to prevent temperature decrease in a border portion of each of heating coils and to enable to eliminate an influence given by the change in a load state. In order to attain this object, an induction heating unit according to the present invention is provided with control units respectively corresponding to a plurality of heating units. A phase detector of the control unit obtains a phase difference between an output current (heating coil current) of an inverter detected by a current transformer reference signal outputted by a reference signal generating section, and inputs it to a drive control section. The drive control section adjusts an output timing (phase) of a gate pulse to be given to the inverter so as to make a phase of the heating coil current of the inverter coincide with a phase of the reference signal outputted by the reference signal generating section. A phase control section controls a variable reactor so as to make the phases of an output voltage and the output current (heating coil current) of the inverter coincide with each other, and improves a power factor of the inverter. Each of the other control units also performs the same control operation.
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Kawanaka Keiji
Nanba Hideyuki
Ozaki Kazuhiro
Uchida Naoki
Mitsui Engineering & Shipbuilding Co. Ltd.
Oliff & Berridg,e PLC
Robinson Daniel
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