Patent ID: 7701183

Claim:
A power circuit, comprising: a power processing circuit, having a first end coupled to an input voltage and a second end, wherein voltages on the first end and the second end of the power processing circuit have different voltage characteristics; a linear voltage-regulating switch, comprising: a power transistor, having a source coupled to the second end of the power processing circuit, a gate, and a drain; and a control switch, having a first end coupled to the gate of the power transistor and a second end coupled to the drain or the source of the power transistor, wherein when the control switch is “on”, the power transistor being off, and when the control switch is “off”, the voltage on the drain of the power transistor is maintained at a predetermined value by the linear voltage-regulating switch; and a capacitor, having a first end coupled to the drain of the power transistor and a second end grounded, wherein an output voltage is obtained from the first end of the capacitor.