| 摘要 |
PURPOSE: A power supply device for controlling the input voltage which is sensed in real time is provided to prevent damage to a control integrated circuit by sensing the input voltage using a simple circuit structure. CONSTITUTION: A voltage sensing part(110) senses the input voltage inputted from outside in rear time. A first switching part(120) turns off, when the voltage is lower than the reference voltage. The first switching part turns on, when the voltage is higher than the reference voltage. A control switching part(130) receives the first signal and controls the input voltage provided to the control integrated circuit. The control switching part comprises a bipolar junction transistor.
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