An Improved Topology for the Current Fed Parallel Resonant Half Bridge Circuits Used in Fluorescent Lamp Electronic Ballasts

An improvement in the current fed parallel resonant half bridge (CFPRHB) circuits used in fluorescent lamp electronic ballasts isprovided in this paper. The CFPRHB belongs to the self-oscillating family which includes the current fed push-pull and seriesresonant inverters, most of which are used in instant-start applications. However, many failure modes are related to the bypasscapacitor according to an analysis of failed samples. In this paper, the operating functions of the existing topology in the steady stateare analyzed and the main root cause of failure modes has been found. Comparisons between the two topologies are conducted interms of the voltage stress of the bypass capacitor as well as the thermal and performance of the ballasts to verify the advantages ofthe proposed topology. It is found that the improved topology is capable of enhancing the reliability and reducing the cost ofproducts without having a negative influence on the system performance.

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Cite this article

[IEEE Style]

Q. Wang, M. Cheng, B. Zhang, "An Improved Topology for the Current Fed Parallel Resonant Half Bridge Circuits Used in Fluorescent Lamp Electronic Ballasts," Journal of Power Electronics, vol. 15, no. 2, pp. 567-575, 2015. DOI: 10.6113/JPE.2015.15.2.567.

[ACM Style]

Qingsong Wang, Ming Cheng, and Bing Zhang. 2015. An Improved Topology for the Current Fed Parallel Resonant Half Bridge Circuits Used in Fluorescent Lamp Electronic Ballasts. Journal of Power Electronics, 15, 2, (2015), 567-575. DOI: 10.6113/JPE.2015.15.2.567.