Title:
HIGH FREQUENCY INDUCTION HEATING ELECTRIC POWER SUPPLY DEVICE
Document Type and Number:
Japanese Patent JP3150450
Kind Code:
B2
Abstract:
PURPOSE: To heighten a utilization factor, carry out load temperature control individually, and heat materials to be heated precisely.
CONSTITUTION: Output of DC electric power supply 1 is converted into a high frequency alternating current by an inverter 2, and voltage is transformed by a transformer 3, and is inputted to heating coils 5-7 through a capacitor 4 and semiconductor switches 21-23. A control device to control the inverter 2 is arranged so that the capacitor 4 and the selected single heating coil can conform to each other when the semiconductor switches 21-23 are switched to/from each other. In this control device, temperatures at which materials 8-11 to be heated are heated by the heating coils 5-7 are detected by temperature detectors 14-16. The detected temperatures are converted into electric signals by transformers 24-26, and are held by hold circuits 27-29, and a difference between the hold value and a preset value is amplified by an error amplifier 30, and the inverter 2 is controlled.
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Inventors:
Takijiro Shimamoto
Toshiharu Umetsu
Eisuke Sakai
Toshiharu Umetsu
Eisuke Sakai
Application Number:
JP27421192A
Publication Date:
March 26, 2001
Filing Date:
October 13, 1992
Export Citation:
Assignee:
MITSUBISHI HEAVY INDUSTRIES,LTD.
Sansha Electric Co., Ltd.
Choryo Engineering Co., Ltd.
Sansha Electric Co., Ltd.
Choryo Engineering Co., Ltd.
International Classes:
B23K31/00; C21D1/42; H05B6/10; (IPC1-7): H05B6/10; B23K31/00; C21D1/42
Domestic Patent References:
| JP5796487A | ||||
| JP6084789A | ||||
| JP415197U |
Attorney, Agent or Firm:
Takehiko Suzue