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Self-oscillating dimmable electronic ballast

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4 Author(s)
Raniere Seidel, A. ; Electron. Ballast Res. Group, Univ. Fed. de Santa Maria, Brazil ; Bisogno, F.E. ; Pinheiro, H. ; do Prado, R.N.

This paper presents a simple alternative for an electronic ballast operating in self-sustained oscillating mode with dimming capability for fluorescent lamps. A simple modification in one of the gate drivers side circuit allows the lamp to dim without compromising the simplicity, reliability, and low cost which characterize the self-oscillating electronic ballast (SOEB). A qualitative analysis is presented to explain the behavior of the proposed self-oscillating electronic ballast with dimming feature. In addition, the stability and the key equations for the design are derived using the extended Nyquist criterion and describing function method. Experimental results from two 40-W electronic ballasts are presented to demonstrate the performance and to validate the analysis carried out.

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Industrial Electronics, IEEE Transactions on  (Volume:50 ,  Issue: 6 )