Research On High Power Factor Electronic Ballast For HPS And LPS

With the development of society, ecnomic expand and energy tensity, the people increasingly need high power factor electronic ballast which can save energy, decrease cost and improve lighting condition, at the same time electric lighting needs the new power electric technology.So it will become symbol of society progress to develop HPS/LPS high power factor electronic ballast with the characteristics of greenness, high luminous efficiency, long life, good colour rendering and so on. High Pressure Sodium (HPS) has the hightest luminous efficiency among high intensity lighting sources, and also has long life good colour and strong ray penetrability ,etc. It has been the preeminence representative in the third generation lighting source. And that Low Pressure Sodium (LPS) has the hightest luminous efficiency and long life among the lighting sources, so it was happily accepted by more and more people. The HPS/LPS theory and characteris was amylased, the suited high power factor electronic ballast was developed, a new way to restrain sound resonance and new igniting structure was put forword. Detailed academic analyse for the involved technology of electronic ballast, sum up and prospect of the research direction in the future was given in the paper, primary research contents about electronic ballast are as follows:1. Some analysis and comparisons between different topology structures of HPS electronic ballast and LPS electronic ballast, and capabilities and specialties,2. To some studies on the sound resonance mechanism of HPS, Putting forward one new scheme to avoid sound resonance of HPS through comparing.3. Putting forward two different ignite circuit aimed at different traits of the HPS/LPS, and giving detailed discuss for each theory. Novel HPS in ignite circuit.4. Detailed illustration for the theory of Active power factor correction circuitry and parameter account aimed at 400W HPS.5. Some diffent necessary protective measures such as over voltage, over heat, over current, open filament and short circuit etc for HPS and LPS.6. developing commercial HPS/LPS electronic ballast, and optimizing technics and layout, solving heat and scatter heat.