Patent ID: 7166932

Claim:
A power circuit for generating a standard voltage based on an input voltage, said power circuit comprising: a step-down circuit that steps down said input voltage to said standard voltage, when said input voltage is larger than said standard voltage; a step-up circuit that steps up said input voltage to said standard voltage, when said input voltage is smaller than said standard voltage; a voltage determiner that determines whether said input voltage is larger than or smaller than said standard voltage; a voltage output unit that receives said input voltage, and outputs said input voltage as a supply voltage when said voltage determiner determines that said input voltage is larger than said standard voltage, and outputs no voltage when said voltage determiner determines that said input voltage is smaller than said standard voltage; and a circuit actuator that can detect said supply voltage, and that actuates said step-down circuit when said supply voltage is detected, and that actuates said step-up circuit when said supply voltage is not detected.