Patent ID: 7688047
Filing Date: 2010-03-30
Classification: H02M,Y10S

Abstract:
1. A power circuit for outputting an output voltage, the power circuit comprising: a switching regulator part for regulating input voltage to a first predetermined voltage and outputting a first output voltage to an output terminal; a series regulator part for regulating the input voltage to a second predetermined voltage and outputting a second output voltage to the output terminal; and a control circuit part configured to control operation of the switching regulator part and control the second predetermined voltage of the series regulator part to chance the second output voltage from a first non-zero voltage value to a second non-zero voltage value; wherein immediately after power is turned on, the control circuit part stops the switching regulator part from outputting the first output voltage and activates the series regulator part so that the second predetermined voltage is output from the series regulator part, wherein when the second output voltage output from the series regulator reaches the second predetermined voltage, the control circuit part stops the series regulator part from outputting the second output voltage and activates the switching regulator part so that the first output voltage of the first predetermined voltage is output from the switching regulator part, and wherein after the first output voltage reaches the first predetermined voltage, the control circuit part changes the second predetermined voltage so that a non-zero voltage smaller than the first predetermined voltage is output from the series regulator part.