Analysis of Input Waveform of a TRIAC Dimmable LED Power Supply
LE Zai
JU Yaowu
Abstract：Controllable TRIAC dimming has the advantages of simple electrical wiring and cost-effectiveness,and is still widely used in lighting applications that require dimming.Traditional TRIAC dimmers are often designed based on pure inductive or resistive loads,and the load is generally fixed during operation.When they work together,they can achieve ideal dimming effects.The LED power supply is a dynamic load compared to the TRIAC dimmer,and its load characteristics are not purely resistive or inductive.Therefore,when they work together,they may face compatibility issues,typical abnormal effects include the inability to obtain stable LED lighting or abnormal heating of the LED power supply in the TRIAC dimming state.Analyzing the input waveform of LED driving power supply under TRIAC dimming state is a necessary condition for studying the above-mentioned abnormal performance.Based on the working principle analysis,the fundamental reasons for poor compatibility and LED power supply heating have been mastered,and corresponding solutions have been provided.
Keywords：TRIAC dimmingLED power supplycompatibility
Publication Date：2025-07-25
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 12-16 )