Line synchronized electrical device and controlling method thereof

摘要

A controlling method for an electrical apparatus and a device thereof are provided in the present invention. The method includes the steps of: (a) providing an electrical apparatus and an AC power; (b) generating a control signal synchronized to the AC power; and (c) controlling the electrical apparatus by the control signal. The device includes a threshold detector, a phase-locked loop coupled to the threshold crossing detector and an output circuit coupled to the phase-locked loop.

主权项

1. A line synchronized control device, comprising:
a threshold crossing detector receiving a first input signal, detecting a first threshold crossing of the first input signal and generating a first output signal having a first specific frequency upon the detection of the first threshold crossing of the first input signal; a phase-locked loop coupled to the threshold crossing detector and generating a second output signal having a second specific frequency being multiples of the first specific frequency and synchronized to the first output signal; and an output circuit coupled to the phase-locked loop, receiving a second input signal and generating a control signal having the second specific frequency, synchronized to the first output signal and having a specific duty cycle determined by the second input signal and by a power supply interruption by a user to control an electrical apparatus.