How to balance the power supply capacity and the non-stroboscopic, the common solutions are two solutions: thyristor and relay. Due to the heating problem of thyristor, the relay solution is currently more mainstream on the market. The following mainly explains the working principle of the relay solution. The specific working principle of its open state is shown in Figure 8.

1. The voltage at both ends of the neutral and live wires is a sine wave. When the AC is in the positive half-wave, due to the unidirectional conductivity of the diode D2 and the disconnection of the MOS tube Q1, the current at this time flows through the diode D1, the energy storage and control circuit, so that the energy storage and control circuit work, providing a stable output voltage for the back-end control system to work, and at the same time controlling the MOS tube Q1 to conduct at a certain set voltage. Therefore, when the AC is in the positive half-wave, only a small part of the energy is stored to power the back-end control system, and the remaining energy is used to power the LED through the MOS tube Q1.

2. When the AC is in the negative half-wave, the current forms a loop through the LED and the diode D2 to power the LED.