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Losses in self-oscillating ballasts for electrode-type compact fluorescent lamps

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3 Author(s)
Shafi, M.A. ; Eng. Dept., Univ. of Cambridge, Cambridge, UK ; McMahon, R.A. ; Weier, S.

Commercially available integrated compact fluorescent lamps (CFLs) use self-resonant ballasts on grounds of simplicity and cost. To understand how to improve ballast efficiency, it is necessary to quantify the losses. The losses occurring in these ballasts have been directly measured using a precision mini-calorimeter. In addition, a Pspice model has been used to simulate the performance of an 18 W integrated CFL. The lamp has been represented by a behavioural model and Jiles Atherton equations were used to model the current transformer core. The total loss is in close agreement with measurements from the mini-calorimeter, confirming the accuracy of the model. The total loss was then disaggregated into component losses by simulation, showing that the output inductor is the primary source of loss, followed by the inverter switches.

Published in:

Power Electronics, IET  (Volume:4 ,  Issue: 5 )

Date of Publication:

May 2011

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