| 摘要 |
The power supply control circuit for a home automation system detects the zero crossing, and controls the power supply provided to the system when the phase of the AC power supply is O deg. or 180 deg.. The circuit includes a DC power supply section (10) for producing the system driving voltage by rectifying the AC power source, and a photo-coupler (PT1) for providing the interrupt signal to the CPU (MC). |
