Compared with the 120V input, the 277V input boost circuit power supply current is greater, resulting in higher output voltage and smaller ripple, but there are still many times not working, LED lamp output current frequency is much higher than 120V, about 1kHz, about 1kHz frequency can not be recognized by the human eye, so it does not appear flash, but the power fluctuations are large.
正在翻译中..