Patent ID: 8225125
Filing Date: 2012-07-17
Classification: H03K

Abstract:
1. A power supply selector, comprising: a first selection module, having a first input to receive multiple candidate power supplies and an output to output an internal power supply, configured to select a power supply from the multiple candidate power supplies as the internal power supply; a control module, coupled to the output of the first selection module to receive a first signal input as the internal power supply, to receive a second signal input for receiving the multiple candidate power supplies, and having an output to output a control signal of each candidate power supply in the multiple candidate power supplies, configured to compare voltages of the multiple candidate power supplies to generate the control signal of each candidate power supply; and a second selection module, having a control input to receive the control signal of each candidate power supply and to receive a third signal input for receiving the multiple candidate power supplies, configured to select a power supply for output from the multiple candidate power supplies under control of the control signal of each candidate power supply.