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Reduced Order Model for Envelope and Small-Signal Analysis of a Phase-Controlled Triple LCpCs Resonant Inverter for Electronic Ballast Applications

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3 Author(s)
Branas, C. ; Syst. & Autom. Eng. Dept., Univ. of Cantabria, Santander, Spain ; Azcondo, F.J. ; Casanueva, R.

In this paper, the fundamental approximation combined with a time-varying phasor transformation is applied to obtain an envelope model of a phase-controlled triple LCpCs resonant inverter. The resulting model removes the high-frequency component while keeping the useful information contained in the waveform envelopes. The method provides large and small-signal Spice compatible models in a straightforward manner. The inverter is controlled at constant switching frequency by the phase displacement, Psi, of the midpoint voltage of one class D section referred to the others. An approximated explicit form of the small-signal transfer function from the control angle, Psi, to the load current is obtained by using a reduced order model. The proposed overlap phase control exhibits a wide bandwidth suitable for applications such as control of gaseous discharges. Experimental results are given using a 400 W high-pressure sodium lamp as load.

Published in:

Industry Applications Society Annual Meeting, 2009. IAS 2009. IEEE

Date of Conference:

4-8 Oct. 2009