LED lamp control method, controller, LED lamp and control system thereof

The invention discloses an LED lamp control method, a controller, an LED lamp and a control system thereof. The method is applied to the LED lamp control system, the LED lamp control system comprises the controller and the LED lamp which are connected in series, the controller controls on and off of positive and negative half-cycle signals VA and VB of a single live wire and generates two paths of zero-crossing interrupt signals INT-A and INT-B, and after the system is started, a falling edge of each INT-A and INT-B triggers the controller to be conducted for t1 or t2 so that large notches corresponding to t1 or small notches corresponding to t2 are generated on the VA and VB, the large notches and the small notches correspond to different digital signals respectively, and an AC voltage waveform is controlled to perform digital signal transmission by controlling the time delay t1 and t2. According to the invention, falling-edge single-live-wire power taking is adopted, the problems of large current impact, la