POWER SUPPLY APPARATUS AND CONTROL METHOD THEREOF

摘要

A power switch circuit includes an oscillation circuit that generates a clock signal based on a supplied first voltage. A boosting circuit receiving the clock signal and boosting the first voltage based on the clock signal to output a boosted first voltage as a second voltage is provided. A detection circuit that detects a difference in voltage levels between an input voltage and the first voltage and outputs a voltage selection signal based on the detected difference is provided. A voltage selection circuit that selects one of the first voltage and the second voltage based on the voltage selection signal and outputs the selected voltage is provided. A switching element switching according to a control voltage based on an enable signal and the selected voltage is also provided.

主权项

1. A power switch circuit, comprising:
an oscillation circuit configured to generate a clock signal based on a first voltage supplied thereto; a boosting circuit configured to receive the clock signal and boost the first voltage supplied thereto, and to output a boosted first voltage as a second voltage; a detection circuit configured to detect a difference in voltage levels between an input voltage and the first voltage and to output a voltage selection signal based on the detected difference in voltage levels; a voltage selection circuit configured to select one of the first voltage and the second voltage, based on the voltage selection signal, and to output the selected one of the first voltage and the second voltage; and a switching element configured to switch according to a control voltage based on an enable signal and the selected one of the first and second voltages.