Induction heating device with a switching power source and image processing apparatus using the same
AssigneesRicoh Company, Ltd., Tohoku Ricoh Co., Ltd.
InventorsHiroto Ohishi, Masae Sugawara
Life of this patent
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Abstract
An induction heating device includes a plurality of induction coils connected to a single high-frequency power source and each being able to be ON/OFF controlled by a switch. A current is selectively fed only to desired part of the induction coils or to all of the induction coils connected in parallel. The coils are driven by a current fed thereto at the same time in the same phase. The device may include inverters for controlling power to be fed coil by coil. The device is free from interference and irregular heating and can readily cope with a change in a heating range while controlling power coil by coil.
Claims22
In a power source device comprising a plurality of switching power source lines each including a conversion circuit, which selectively turns on or turns off an input by switching, and a controller for controlling a switching operation of said conversion circuit, the controller assigned to one of said plurality of switching power source lines variably controls an ON width or an OFF width while the controller assigned to the other switching power source line executes control with a control signal produced by thinning down a signal synchronous to the one switching power source line.
Dependencies are inferred from the claim text.