Novel Pulsating-DC High-Voltage Linear Driving Scheme for GaN LED General Lighting

This work investigates a novel pulsating DC high-voltage linear driving scheme for GaN-based Light-emitting diode (GaN LED) general lighting to save costs and alleviate flicker. The superiority and practicality of this scheme in three-phase AC power grids were demonstrated for the first time. Compared to applications for single-phase AC grids, linear driving of GaN LEDs for three-phase AC grids can provide superior performance for general lighting. The DC component of the three-phase AC rectified voltage reaches 90.7%, which effectively alleviates the flicker problem. In this paper, we balanced GaN LED power and driving efficiency by optimizing the GaN LED distribution of the linear multi-string GaN LED driving scheme while taking the effects of grid voltage fluctuations into account. In addition, we constructed a double-string GaN LED lighting system as a modular prototype with scalability. The experimental results exhibit high driving efficiency (similar to 94% @380 V line voltage), high power factor (similar to 0.952), flicker-free, and high reliability at a very low cost (similar to$0.005/W).

Automated summary

This work proposes a novel pulsating DC high-voltage linear driving scheme for GaN-based LED general lighting to save costs and reduce flicker. The superiority and practicality of this scheme in three-phase AC power grids were demonstrated for the first time. Linear driving of GaN LEDs for three-phase AC grids provides superior performance for general lighting, with a 90.7% DC component in the rectified voltage effectively alleviating flicker.