Title:
HIGH FREQUENCY HEATING APPARATUS
Document Type and Number:
Japanese Patent JP3206521
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To prevent increase of voltage current duty ratio of a first semiconductor switching element by impedance alteration of a magnetron regarding an electric power source for driving a magnetron of a high frequency heating apparatus employing the magnetron.
SOLUTION: The electric power source for driving a magnetron of this high frequency heating apparatus comprises a driving circuit 20 provided with a voltage detecting means 34 and the voltage detecting means 34 is constituted of a comparison means 36 to compare with the voltage of a smoothing capacitor 14 and a switching means 37 to switch standard values of a starting time and a steady operation time. The means 34 detects the impedance alteration of the magnetron, stops the high frequency heating apparatus, and prevents increase of voltage-current duty of a first semiconductor switching element.
Inventors:
Yoshiro Ishio
Makoto Mihara
Who Sakamoto
Haruo Suenaga
Villa Daisuke
Kenji Yasui
Makoto Mihara
Who Sakamoto
Haruo Suenaga
Villa Daisuke
Kenji Yasui
Application Number:
JP30543197A
Publication Date:
September 10, 2001
Filing Date:
November 07, 1997
Export Citation:
Assignee:
Matsushita Electric Industrial Co., Ltd
International Classes:
H05B6/68; (IPC1-7): H05B6/68
Domestic Patent References:
| JP27385A | ||||
| JP1146282A | ||||
| JP9245953A | ||||
| JP6310267A | ||||
| JP5326135A |
Attorney, Agent or Firm:
Fumio Iwahashi (2 others)
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