Small-signal analysis of frequency-controlled electronic ballasts

摘要: This paper presents analytical tools aimed at improving and simplifying the development of frequency-controlled dimming electronic ballasts. A modified phasor transformation is proposed that converts a frequency-modulated signal into an equivalent time-varying phasor. The applied to develop complete small-signal model LCC resonant ballast, which explicitly models effect frequency modulation on envelopes outputs. Spice-compatible implementation presented facilitates ac analysis ballast in addition envelope transient simulation, verified through comparison experimental simulation results. closed-form solution control-to-output current transfer function for ballast-resistor system presented, along with key observations pole locations low-frequency gain facilitate simple intuitive compensator design. effects lamp dynamics controller design are discussed, followed by example feedback controller.