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US 5,204,504 AGranted
High-frequency heating apparatus including ringing effect suppressor for switching element
AssigneeKabushiki Kaisha Toshiba
InventorTeruya Tanaka
Life of this patent
Estimating the term…
Abstract
In an inverter type high frequency heating apparatus such as an electromagnetic cooker and a microwave oven, an insulated gate bipolar transistor is employed as a switching element. A parallel circuit arranged by a capacitor and a resistor is interposed between a gate electrode of the gate insulated bipolar transistor and a gate driver circuit so as to prevent a power loss, or ringing effect when the gate insulated bipolar transistor is turned off.
Claims19
A high frequency heating apparatus comprising:
- DC (direct current)-to-AC (alternating current) inverter means, having an insulated gate bipolar transistor, for inverting DC power into high frequency AC power utilizing a resonant phenomenon by switching the insulated gate bipolar transistor at a predetermined high frequency, the AC power heating an article using electromagnetic induction;
- driver means for driving a gate electrode of the insulated gate bipolar transistor for the switching;
- removing means, interposed between the driver means and the gate electrode of the insulated gate bipolar transistor, for removing an electron remaining between the gate electrode of the insulated gate bipolar transistor and an emitter thereof when the insulated gate bipolar transistor is turned OFF;
- and,
- suppressing means, connected in parallel to the removing means, for suppressing vibrations of a gate voltage of the insulated gate bipolar transistor when the insulated gate bipolar transistor is turned OFF.
2 more elements
A high frequency heating apparatus comprising:
- DC (direct current)-to-AC (alternating current) inverter means, having an insulated gate bipolar transistor, for inverting DC power into high frequency AC power utilizing a resonant phenomenon by switching the insulated gate bipolar transistor at a predetermined high frequency, the C power heating an article using dielectric heat;
- driver means for driving a gate electrode of the insulated gate bipolar transistor for the switching;
- removing means, interposed between the driver means and the gate electrode of the insulated gate bipolar transistor, for removing an electron remaining between the gate electrode of the insulated gate bipolar transistor and an emitter thereof when the insulated gate bipolar transistor is turned OFF;
- and,
- suppressing means, connected in parallel to the removing means, for suppressing vibrations of a gate voltage of the insulated gate bipolar transistor when the insulated gate bipolar transistor is turned OFF.
2 more elements
Dependencies are inferred from the claim text.