Method for controlling power source relay of microwave oven

電子レンジの電源リレー制御方法

Abstract

(57)【要約】 【課題】 電源リレーの接点が離れるとき発生するスパ ークを減らして、電源リレー接点の損傷を減少させリレ ーの寿命を延長し得る電子レンジの電源リレーの制御方 法を提供しようとするものである。 【解決手段】 50Hz/60Hzのクロック信号が入力す ると、それ以前に電源リレーが電源電圧の「+」サイク ルでオフされたか、又は電源電圧の「−」サイクルでオ フされたかを判断し、この判断に従いリレー駆動信号の 出力時間を所定時間の間遅延させ電源電圧の「+」 「−」サイクルの頂点以後に電源リレーをオフさせるよ うにした電子レンジの電源リレー制御方法が提供され る。
PROBLEM TO BE SOLVED: To shorten a duration of spark generation, lessen the frequency of spark generation, and prolong the life of a relay contact by alternately turning off an electric power source relays at a specified time of the phase of power source voltage. SOLUTION: When input of clock signals with 50/60 Hz is inputted to a 50/60 Hz-clock input sensing part 12, a CPU 11 sets a 50/60 Hz clock input plug. At this point, if a plus-cycle-on-plug is already set, the CPU 11 judges that a power source relay is turned off in a plus-cycle of power source voltage before the time. Then, the CPU 11 sends out control signals to a relay on/off signal generating apparatus 14 and a power source relay on/off controlling part 18 to turn off the power source relay by sending a relay driving signal output with a delay by 2nπ+3/4π time of the power source voltage phase. Also, in the case of no setting of the plus-cycle-on-plug, the CPU 11 judges that the relay is turned off in a minus-cycle of the power source voltage and sends out control signals to the apparatus 14 and the controlling part 18 to turn off the power source relay by sending a driving signal output with a delay by (2n-1)π+3/4π time of the power voltage phase. COPYRIGHT: (C)1997,JPO

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Patent Citations (2)

    Publication numberPublication dateAssigneeTitle
    JP-H0454357-AFebruary 21, 1992Kubota CorpTraveling operating structure for working car
    JP-H0521151-AJanuary 29, 1993Sanyo Electric Co Ltd, 三洋電機株式会社高周波加熱装置

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Cited By (1)

    Publication numberPublication dateAssigneeTitle
    US-4855114-AAugust 08, 1989Sherex Chemical Company, Inc.Dioxime kinetic enhancer for solvent extraction of gallium from basic aqueous solutions thereof