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Modified Flyback for HID Lamp Supply: Design, Modeling, and Control

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6 Author(s)
Pappis, D. ; Programa de Pos-Grad. em Eng. Eletr.-PPGEE, Univ. Fed. de Santa Maria, Santa Maria, Brazil ; Schittler, A.C. ; Pause, J.R. ; Costa, M.A.D.
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This paper presents an electronic ballast for driving high intensity discharge (HID) lamps with low frequency square waveform from a dc supply. From the dc source (e.g., PFC rail), a flyback arrangement is inserted into a switching structure whose output provides low frequency voltage yet avoiding instability issues. Proposal's main advantage is the use of one single choke of simple assembly and only two active switches for current control and inversion. Converter design for DCM is presented in this work, besides an equivalent circuit from a control point of view. Small signal ac model is obtained and a feedback control loop is designed, based upon frequency response stability and performance analysis. HID dynamics is inserted into converter model, with feedback directly implemented. A prototype is presented and described in detail, consisting of a complete power and sensing circuit fully referenced to the switches common ground proposal. For design conformity, experimental and simulation results from Matlab and PSIM are presented, as well as discussions about the converter feasibility.

Published in:

Industry Applications, IEEE Transactions on  (Volume:49 ,  Issue: 2 )

Date of Publication:

March-April 2013

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