Reator Eletrônico Auto-Oscilante com Alto Fator de Potência para Alimentação de Quatro Lâmpadas Fluorescentes (High Power Factor Self-Oscillating Electronic Ballast to Supply Four Fluorescent Lamps)

Marco Antônio Dalla Costa (marcodc@ieee.org), Ricardo Nederson do Prado (mprado@ieee.org)


Universidade Federal de Santa Maria – UFSM
This paper appears in: Revista IEEE América Latina

Publication Date: April 2005
Volume: 3,   Issue: 2 
ISSN: 1548-0992


Abstract:
This paper presents an innovative modification in the conventional self-oscillating driver, in order to supply variable loads. This modification consists of adding an auxiliary output filter supplying a small power resistor, which also includes the primary winding of the self-oscillating transformer. The analysis for self-sustained oscillations is performed by extended Nyquist criterion, which defines the design equations for the ballast component values. A design example is presented, using the proposed circuit in a high power factor electronic ballast supplying four independent lamps. A passive circuit named valley charge pump is used to perform the power factor correction. The ballast supplies four lamps independently, without considerable frequency changes, with an efficiency of 93%, and reaching IEC 61000-3-2 requirements for the input current distortion.

Index Terms:
Self-Oscillating; Power Factor Correction; Fluorescent Lamps   


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