Phase Detecting Device, Phase Control Device including the Phase Detecting Device, and Fuser Control Device including the Phase Control Device

摘要

A phase detecting device (130) includes a power input unit (132) that receives an AC voltage; a phase detector (134) that detects zero-crossing points of the AC voltage, and outputs a phase detecting signal when the zero-crossing points of the AC voltage are detected; and a power switch (136) that selectively cuts off a flow of AC into the power input unit (132) in response to a mode control signal.