LED driver design using GaN device

• Main Author: Zang, Qibang
• Other Authors: Goh Wang Ling
• Format: Theses and Dissertations
• Language: English
• Published: 2019
• Subjects: Engineering::Electrical and electronic engineering
• Online Access: http://hdl.handle.net/10356/78736
• Institution: Nanyang Technological University

The widely used LED lighting driver is series resonant (SR) converter or parallel resonant (PR) converter, which has a simple and understandable topology. The efficiency of conventional LED lighting in the market is around 90% to 92%. In this dissertation, an improved design with high efficiency reaching up to 97% to 98% based on traditional topology is proposed. Gallium Nitride (GaN) devices instead of standard MOSFETs are used in this novel design, in order to achieve a higher frequency operation up to 1 MHz with less performance loss for the switched mode power supply design. Additionally, magnetic size is reduced significantly by operating the converter at higher frequencies, which is better for applications in very limited space with small form factors. However, hard switching is no longer able to achieve satisfied performance under high frequency operation, hence soft switching is applied in the circuit design instead. This thesis details the design of a digitally controlled and credit card size LED lighting driver. This LED converter is converting from 380 VDC to 300 VDC to drive the new outdoor lighting with high efficiency, designed to work for constant current output (500 mADC) for LED lighting for commercial applications using GaN devices. The LED driver will also feature DALI communication protocol for remote monitoring and control.