A primary side controlled WLED driver compatible with Triac dimmer
ABSTRACT This paper proposes a single-stage Flyback PFC Converter with new primary side control scheme for Triac compatible LED drivers. The proposed control scheme can achieve high power factor and efficiency by eliminating the conventional dummy load required for Triac dimmer. Also, almost linear dimming can be achieved by the phase angle feed forward and primary side constant power control. No secondary side current feedback is required, which dramatically simplify the whole circuit and increases the reliability. The detailed operation principles are presented and the experimental results for a WLED driver verified the theoretical analysis.
Conference Proceeding: An Improved Single-Stage Flyback PFC Converter for High-Luminance Lighting LED Lamps[show abstract] [hide abstract]
ABSTRACT: This paper presents a universal power supply for high-luminance LED lamp test. The proposed power supply is designed and implemented by adopting an improved single-stage Flyback configuration. A constant current control method is used to regulate the lamp current and brightness under different pieces of LED series connection. A laboratory prototype has been built and tested. With the prototype, high efficiency, high power factor, and constant lamp current can be achieved for the performance test of various LED lamps.Electronic Measurement and Instruments, 2007. ICEMI '07. 8th International Conference on; 08/2007
- [show abstract] [hide abstract]
ABSTRACT: The paper introduces a new family of single-stage isolated power-factor-corrected power supplies with fast regulation of the output voltage, and discusses the most-important design issues, including all of the following: storage-capacitor voltage, dual-range and wide-range operation, device RMS currents, and line harmonic currents. In addition to the theoretical analyses, experimental data are also providedApplied Power Electronics Conference and Exposition, 1995. APEC '95. Conference Proceedings 1995., Tenth Annual; 04/1995
Conference Proceeding: Issues, Models and Solutions for Triac Modulated Phase Dimming of LED Lamps[show abstract] [hide abstract]
ABSTRACT: This paper discusses the difficulties in dimming Edison socket LED lamps directly from residential phase modulated dimmer switches. In order to explain these difficulties PSpice models for the dimmers are proposed that necessarily include diac characteristics to improve accuracy. A method to dim the LEDs from the residential dimmers is discussed.Power Electronics Specialists Conference, 2007. PESC 2007. IEEE; 07/2007