Ripple is the main cause of stroboscopic. The larger the text wave, the larger the stroboscopic and the wave shape

In addition to the ripple, the dimmable power supply that adjusts the PWM output is also defined as a stroboscopic ac dimmable led power supply that has a regular horizontal bar-shaped PWM output on the camera equipment. When the light is not dimmed, there will be no stroboscopic. When dimming, the stroboscopic will only appear when the output PWM is adjusted. The output frequency> 170Hz is not harmful to the naked eye. In addition, in recent years, it has been said that> 3200Hz reaches the stroboscopic exemption, and the actual test still has the stroboscopic phenomenon, but it is not so obvious.

When the led driver as power supply ‘s output frequency is adjusted to ＞3.2k, the stroboscopic is already very weak. Above 4000HZ, there is no stroboscopic at all, and 20000HZ is no stroboscopic at all.

The reason for the output frequency of 20kHZ is not only to solve the stroboscopic problem of all thyristor PWM output dimming power supplies during dimming, but also to solve the problem of noise caused by not tightly locked wiring.

Nowadays, many people like to use camera equipment to see whether the flicker is on the screen, but this test method is wrong ,It is correct to test with a professional stroboscope,

The higher the PWM frequency, the lower the flicker, but the higher the frequency, the greater the heat on the contact point with the lamp, because PWM=pulse duty ratio=ultra-high-speed switching... The stroboscopic caused by the ripple is the residual alternating current after the alternating current turns into a direct current. The larger the ripple, the more serious the stroboscopic. The ripple will directly damage the LED lamp beads and cause rapid light decay.