Power Factor Correction for Dimmable and Green LED lighting
20130401 - 20140630
Mr David Kwong
1. Verified PFC silicon IP blocks in TSMC/UMC 0.18um/0.25um/0.35um HV processes, namely, i. THD (total harmonic distortion) optimized multiplier ii. Starter iii. Maximum frequency clamp iv. Line brown-out and line ready restart trigger v. Clamped output gate driver vi. Zero crossing detection clamp circuit vii. High voltage internal regulator viii.Digital to analog converter (DAC) ix. Summing amplifier x. Internal triangular waveform generator xi. Bleeder xii. Tunable frequency clock oscillator 2. Silicon verified Engineering Prototype of Single-Stage Power Factor Correction (PFC) Flyback IC Controller 3. Silicon verified Engineering Prototype of Single-Stage Power Factor Correction (PFC) Flyback IC Controller tailored-made for Triac dimming 4. Evaluation modules with Single-Stage PFC Flyback i. LED lighting application module for outdoor applications (street lamp or Belisha Beacon (BB) lamp) ii. TRIAC Dimmable LED lighting application module for light bulb replacements iii. External RF modules for dimming of LED through wireless control for residential lighting applications 5. Application documentations, with the application mentioned above, will be issued to enable Industry (licensees) to develop GREEN products.
Dr K C Wang Dr David Ng Mr Patrick Chang Mr H K Kwan Mr Victor So Mr Timothy Or Mr Chi Chiu Tsang Mr Edward Wong Ms Sidar Lai Mr Alan Pun Mr Kai Man Ho Mr Yuanzhe Xu
MiniLogic (Licensee) [Sponsor] MiniLogic Device Corporation Limited [Sponsor] Transport Department Winchance Solar (Fujian) Technology Co Ltd
The objective of this project is to promote the development of one of the green energy applications, power factor correction (PFC) device in the power conversion process, to increase the utilization rate of energy. Power conversion devices with higher power factor (PF) will increase the useful power transferred to the power distribution system and reduce power loss and the requirement of power-handling capability of the building utilities, like the thickness of the electric wires. This is due to a reduction in the flow of reactive power in the power system, and hence consumes a smaller amount of electricity as a whole, compared power system using standard, non-PFC devices under equal power outputs. The reduction of energy consumption will reduce pollution emission from power plants. Therefore, it is expected that the demand for PFC power conversion devices will grow exponentially. According to the Department of Energy energy star and Europe EN1000-3-2, the market requirement for LED bulbs and fixtures is expected to be a power factor larger than 0.9 for device with power as low as 10W. Conventionally, isolated AC-DC converters are used to power up LEDs, yet the power factor is just about 0.4-0.5. Alternatively, a boost PFC pre-regulator can be added in front of the AC-DC converter stage to enhance the power factor to 0.9 or higher. Yet, this architecture gives a costly and bulky system with low power efficiency. This project will provide a solution combining the two power stages, namely the PFC pre-regulator stage and the AC-DC step down converter stage, into one single stage using flyback topology which saves component count significantly. We plan to deliver a single-stage PFC flyback controller IC with proven silicon samples capable of operating a converter at a power factor higher than 0.9 for general purpose applications. IP blocks of PFC IPs, PFC controller IC, and application reference designs will be licensable to local companies. With these technical supports from ASTRI, we believe that the development of green energy applications, especially LED lighting, in local industries will be strongly accelerated.