The stroboscopic of LED lamps means that the illumination of the lamps fluctuates unsteadily with the frequency, and the light changes in brightness in a short period of time, and it feels like the lamp is flickering. The human eye will have a distinguishable threshold for this light and dark change of the lamp. Generally, the light flicker below 80 Hz can be detected by the human eye. Above this frequency, the human eye may be more difficult to detect, but the flicker of the lamp still exists, but the lamp has increased the working frequency.
According to related analysis and research, the main cause of LED lamp flicker is the driving power supply. The LED lamp is a diode and requires direct current. At this time, a driving power supply is needed in the working circuit to complete the conversion of alternating current into direct current. The driving power supply includes two parts: rectification and filtering. The rectification part is generally obtained by rectification through a rectifier bridge and then filtered by a filter capacitor. If the quality of the driving power supply is not good, the internal components are relatively low-grade, and all the incoming AC power cannot be converted into DC power, resulting in unstable output current of the driving power supply.
Before the load is intervened, the instability of the output current of the driving power supply is mainly manifested in the instability of the voltage, and this instability is mainly manifested in the output ripple voltage of the driving power supply. This ripple includes high-frequency components and low-frequency components, and the most damage caused by stroboscopic is the low-frequency ripple. The low frequency ripple is mainly caused by the quality problem of the filter capacitor. In order to reduce the manufacturing cost of lamps and lanterns, some merchants who are pursuing the maximization of commodity benefits often choose very cheap ones in the driving power supply. As a result, the lamps produced by consumers have serious frequency after buying them and using them for a period of time Flash problem.
