POWER SUPPLY DEVICE AND IMAGE FORMING APPARATUS

To solve the following problem: a device fails when an input voltage lower than a threshold voltage and an input voltage higher than the threshold voltage occur repeatedly.SOLUTION: When a main power switch 603 is OFF, a switch 306 is OFF and a resistor 307 is connected to a capacitor 309. An FET 30...

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1. Verfasser:	YANO YUZURU
Format:	Patent
Sprache:	eng ; jpn
Schlagworte:	CALCULATING CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER COMPUTING CONVERSION OR DISTRIBUTION OF ELECTRIC POWER COUNTING ELECTRIC DIGITAL DATA PROCESSING ELECTRICITY GENERATION PHYSICS SYSTEMS FOR STORING ELECTRIC ENERGY
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Beschreibung
Zusammenfassung:	To solve the following problem: a device fails when an input voltage lower than a threshold voltage and an input voltage higher than the threshold voltage occur repeatedly.SOLUTION: When a main power switch 603 is OFF, a switch 306 is OFF and a resistor 307 is connected to a capacitor 309. An FET 304 is OFF and the switch 302 is ON. When the main power switch 603 is OFF, the resistor 307 is connected to the capacitor 309, thereby preventing the capacitor 309 from being recharged when a reset switch 122 is turned off by a reset IC 123. Accordingly, an input voltage supplied to a load is prevented from becoming lower than a threshold voltage and becoming higher than the threshold voltage repeatedly.SELECTED DRAWING: Figure 5 【課題】入力電圧が閾値電圧よりも小さい状態と入力電圧が閾値電圧よりも大きい状態とが繰り返し起こると、装置に不具合が生じる。【解決手段】メイン電源スイッチ６０３がＯＦＦ状態においては、スイッチ３０６はＯＦＦ状態であり抵抗３０７はコンデンサ３０９に接続される。また、ＦＥＴ３０４はＯＦＦ状態であり、スイッチ３０２はＯＮ状態である。メイン電源スイッチ６０３がＯＦＦ状態において抵抗３０７がコンデンサ３０９に接続されることにより、リセットＩＣ１２３によってリセットスイッチ１２２がＯＦＦになった際にコンデンサ３０９が再び充電されることを防止することができる。即ち、負荷に供給される入力電圧が閾値電圧よりも小さい状態と当該入力電圧が閾値電圧よりも大きい状態とが繰り返し起こることを抑制することができる。【選択図】図５