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The common causes and treatment methods of LED lights flashing
May 24, 2017

The human eye is usually able to perceive the light flashes of the frequency up to the same frequency, which is higher than that of the frequencies. Therefore, in the application of LED lighting, if the pulse signal frequency is lower than the low frequency component of the, the human eye will feel the flicker. Of course, in specific applications, there are many factors may cause LED lights to blink. For example, in the off-line low power LED illumination application, a common power supply topology is isolated flyback topology structure. In accordance with the "Energy Star" solid-state lighting standard 8W off-line LED driver Greenpoint Reference design for example, because the flyback regulator's sinusoidal power conversion does not provide a constant energy for the primary bias, the dynamic self-power supply (DSS) circuit may be activated and cause light flicker. In order to avoid this problem, the primary bias must be able to discharge at each half cycle, and correspondingly, the amount of capacitance and resistance that comprise the bias circuit needs to be properly selected. In addition, electromagnetic interference (EMI) filters are also required even in LED drive applications that provide excellent power factor correction and support triac dimming. The transient current caused by triac step is the natural resonance of inductance and capacitance in EMI filter. If the resonant property causes the input current to fall below the Triac maintenance current, the triac will be closed. After a short delay, the triac usually leads to the same resonance.

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