What is THD? What causes THD? What does THD<15% mean? What is the waveform diagram?Current Location: Home > What is THD? What causes THD? What does THD<15% mean? What is the waveform diagram?
Answer: THD is total harmonic distortion, THD=1/I1*√(∑Ik2) K>1 (I1 is the fundamental wave); Causes caused by THD: power input sinusoidal AC voltage, after circuit rectification and filtering, the rectifier tube can only be turned on when Vit>Vo, so the current is pulse type, not sine type, in the electronic field, THD is waveform distortion caused by nonlinear devices. As for the LED driver, it includes: voltage total harmonic distortion Vthd and current total harmonic distortion Athd. The LED driver THD that customers often is less than 15%, which means that the current total harmonic Athd is less than 15%.
The THD Current Total harmonic waveform diagram is as follows:
