This paper mainly introduces the flashing of LED bulbs in two-way thyristor dimming, and gives a general analysis of this situation, and gives a solution suggestion. Friends who have such problems in thyristor dimming may wish to spend a few minutes reading this article, I believe there will be unexpected gains.
I don't know if you have encountered such a situation when using two-way thyristor for LED dimming. Using a very good IC to build the circuit and dimming, but LED bulbs often have stroboscopic problems. Although the circuit can operate normally, it is very influential. This article will briefly analyze this situation.
There are many factors contributing to this kind of problem, but the main reasons for the integration are three points: the lamp bead problem, the power supply problem, and the DC power supply current and voltage are unstable. In the case of stroboscopic, you can start from these three aspects, thyristor dimming needs to have a holding current, with it can continue to conduct, otherwise it may flash.
Here, Xiaobian has compiled a proposal for how to solve this situation. For TRIAC dimming LED bulbs, the biggest problem at present is the compatibility of the dimmer. The original design of traditional TRIAC dimmers was to handle the power consumed by hundreds of watts of incandescent bulbs. LED bulbs that consume less than 20W will interact with dimmers that use high-power switching devices. If the interaction between the dimmer and the LED bulb is unstable, visible flicker will occur. To prevent flicker, the current flowing through the TRIAC during the turn-on of the TRIAC dimmer is greater than Ihold (maintain current), otherwise the TRIAC will turn off and the LED bulb will go out. Different dimmers will maintain different currents. A typical holding current range is approximately 5-50 mA.
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