Patent ID: 9479161
Filing Date: 2016-10-25
CPC Classification: H03K

Claim Text:
1. A power circuit comprising: an input terminal receiving a first voltage or a second voltage; an output terminal; a first switch unit, a second switch unit, and a third switch unit; a control unit comprising a voltage division unit coupled to the input terminal and the first switch unit, the second switch unit, and the third switch unit, the voltage division unit receiving the first voltage or the second voltage and outputting a divided voltage to the first switch unit, the first switch unit controlling the second switch unit to output a first drive signal or a second drive signal, and controlling the third switch unit to turn on/off, the third switch unit coupled between the input terminal and the output terminal; and a voltage transform unit coupled between the input terminal and the output terminal, and coupled to the second switch unit of the control unit; wherein when the input terminal receives the first voltage, the first switch unit is turned on, the third switch unit is turned off, the second switch unit outputs the first drive signal to the voltage transform unit, the voltage transform unit transforms the first voltage to an output voltage, and the output voltage is output by the output terminal; when the input terminal receives the second voltage, the first switch unit is turned off, the third switch unit is turned on, the second switch unit outputs the second drive signal to the voltage transform unit, the voltage transform unit cannot operate, and the second voltage from the input terminal is output by the output terminal through the third switch unit.