| 摘要 |
<p>The present invention relates to an AC power supply detector for a power supply device. More specifically, the AC power supply detector uses a discharge resistor already in a general power supply device to implement an AC power detection circuit with an easy configuration. The power supply device includes a filter with a condenser connected to both ends of the AC power supply to block the noise components of the AC power supply. The discharge resistor is included in an input end to be connected to the filter unit to discharge the remaining voltage stored in the condenser once the AC power supply is off. The AC detection circuit includes: a voltage distribution unit which includes multiple division resistors including the discharge resistor to distribute and detect the voltage of the AC power supply; a voltage stabilizing circuit which stabilizes the voltage distributed from the voltage distribution unit; and a comparison unit which compares the voltage from the voltage stabilization circuit unit and the predetermined reference voltage.</p> |
