Design and Implementation of a Novel Single-Stage High-Power-Factor Electronic Ballast for High-Pressure Sodium Lamp

• Main Authors: Wei-Shiang Hung, 洪偉翔
• Other Authors: Chun-An Cheng
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/hcn557

碩士 === 義守大學 === 電機工程學系 === 107 === The high-pressure sodium lamp (HPS) is a kind of high-intensity gas discharge lamp with high luminous efficiency and long service life, and can be applied to lighting occasions such as street lamps, docks and stadiums.The traditional electronic ballast for HPS lamps has many power switches and passive components and limited circuit efficiency due to three-stage or two-stage power conversions. Therefore, this thesis presents a single-stage electronic ballast for HPS lamps with high power factor. The features of the proposed ballast are reduced numbers of circuit components, cost-effectiveness, and high efficiency. The proposed ballast can obtain high power factor and low total-harmonic-distortion (THD) of input utility-line current by designing the coupled inductor at discontinuous-conduction-mode (DCM). In addition, the presented ballast supplies low-frequency square-wave sources to the HPS lamp for avoiding acoustic-resonance. Besides, the thesis analyzes the principle operation of the proposed single-stage electronic ballast, and an electronic ballast prototype circuit for supplying a 250 W high-pressure sodium lamp has been already implemented. Finally , compared with simulated waveforms obtained by IsSpice sofeware and the experimental results, the thesis can demonstrate the advantages includes high power factor (>0.99), low utility-line current THD (<3%), and high circuit efficiency (>89%).