Title :
Simplified analysis of a PWM-controlled parallel resonant inverter for electronic ballast applications
Author :
Branas, Christian ; Azcondo, Francisco J. ; Casanueva, Rosario
Author_Institution :
Electron. Technol., Syst. & Autom. Eng. Dept., Univ. of Cantabria, Santander, Spain
Abstract :
In this paper, the fundamental approximation, combined with a time-varying phasor transformation is applied to obtain the envelope model of an LCp resonant inverter, controlled by the pulse width modulation (PWM) technique. 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 duty cycle parameter. The explicit form of the small-signal transfer function from the duty cycle, D, to the output variable is obtained by neglecting the effect of the parallel capacitor Cp. The proposed PWM 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.
Keywords :
PWM invertors; lamp accessories; resonant invertors; time-varying systems; PWM-controlled parallel resonant inverter; Spice compatible models; electronic ballast applications; power 400 W; pulse width modulation technique; time-varying phasor transformation; Bandwidth; Capacitors; Electronic ballasts; Lamps; Pulse inverters; Pulse width modulation; Pulse width modulation inverters; Resonant inverters; Switching frequency; Transfer functions;
Conference_Titel :
Industrial Electronics, 2009. IECON '09. 35th Annual Conference of IEEE
Conference_Location :
Porto
Print_ISBN :
978-1-4244-4648-3
Electronic_ISBN :
1553-572X
DOI :
10.1109/IECON.2009.5415161