POWER SUPPLY IDENTIFICATION APPARATUS AND POWER SUPPLY IDENTIFICATION METHOD

摘要

Provided is a power supply identification apparatus including circuitry including a first input terminal, a second input terminal and an output terminal which outputs a driving voltage to an electric device, and a power supply identification section which (i) determines from which of a first power supply and the second power supply a power is being input based on a relationship between an input timing of a first voltage to the first input terminal and a second voltage to the second input terminal, and (ii) switches the driving voltage output from the output terminal according to the power supply the power is being input from to control an initial ON/OFF state of the electric device.

主权项

1. A power supply identification apparatus, comprising:
a first power terminal to which a first power supply is connected; a second power terminal to which a second power supply is connected; an output terminal; a voltage switching section having a first input terminal and a second input terminal, the voltage switching section for switching an output voltage of the output terminal into a first voltage representing that the first power supply is connected to the first power terminal or a second voltage representing that the second power supply is connected to the second power terminal according to an input order of signals into the first input terminal and the second input terminal; a first delay section for delaying the voltage supplied via the first power terminal or the second power terminal by a first delay time so as to output the voltage to the first input terminal; a second delay section for delaying the voltage supplied via the first power terminal or the second power terminal by a second delay time shorter than the first delay time so as to output the voltage to the second input terminal; and a delay time switching section for switching the second delay time into a third delay time longer than the first delay time based on the power supply to the second power terminal.