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

Regarding to the ripple, the dimming power supply that adjusts the PWM output is also defined as a strobe on the camera equipment, which is in the shape of a regular bar.

When the PWM output power supply 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. At present, the frequency of our PWM output dimming power supply is 300Hz, 800Hz, and it will be upgraded to 4000Hz-20000Hz in the future, and it is still under debugging.

In addition, in recent years, it has been said that> 3200Hz reaches the stroboscopic exemption, and the actual test still has stroboscopic phenomenon, but it is not so obvious, so we will upgrade the output frequency of these UL listed dimming power supplies to 4000Hz--20000Hz in the later stage, and we are still debugging in.