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The high pressure sodium (HPS) lamp has widely been used in lighting for its efficacy. However, acoustic resonance is the main problem in lamp supply under high frequency operation. This paper proposes a method for acoustic resonance avoidance via the injections of several signals of adjacent frequencies using a half bridge LCC electronic ballast. The study shows that further signals can be introduced...
For decades, high pressure sodium (HPS) lamp has been developed to operate at high frequency in order to increase its lighting efficiency. However, it may present standing waves, acoustic resonances (AR), which can result in arc distortion, flickering, extinction and lamp deterioration in the most severe case. At high frequency, the lamp has quasi resistive behaviour with small hysteresis, which can...
In the last decades, the high pressure sodium (HPS) lamp has been developed to be supplied in high frequency in order to increase the lighting efficiency of the system lamp/ballast. However, at some given frequencies, standing acoustic waves, namely acoustic resonance (AR), might develop in the burner and cause lamp luminous fluctuation, extinction and destruction in the most serious case. Two main...
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