Title :
A comparison of resonant inverter topologies for HPS lamp ballasts
Author :
Nelms, R.M. ; Jones, T.D. ; Cosby, Melvin C., Jr.
Author_Institution :
Dept. of Electr. Eng., Auburn Univ., AL, USA
Abstract :
The utility of resonant inverter topologies in electronic ballasts for high-pressure sodium (HPS) lamps is examined. The three basic types of resonant inverters, series-loaded, parallel-loaded, and series-parallel-loaded, are compared for their applicability in electronic ballasts. A parallel-loaded resonant (PLR) inverter operating at a constant switching frequency is selected because of the high voltage gains possible. As a result, it is not necessary to use a transformer to provide enough voltage to start the HPS lamp from a low-voltage DC source such as that obtained from rectification of 120 V AC source. A PLR inverter was designed based on this analysis. A computer simulation of this design verified inverter operation when driving an HPS lamp. A laboratory prototype was then constructed and found to operate satisfactorily
Keywords :
circuit analysis computing; circuit resonance; digital simulation; invertors; lamp accessories; load (electric); metal vapour lamps; sodium; switching circuits; 120 V; HPS lamp; Na; computer simulation; constant switching frequency; design; electronic ballasts; high-pressure sodium; laboratory prototype; low-voltage DC source; parallel-loaded; resonant inverter topologies; series-loaded; series-parallel-loaded; voltage gains; Circuit topology; Electronic ballasts; Inductors; Ionization; Lamps; Prototypes; Resonant inverters; Switching frequency; Transfer functions; Voltage;
Conference_Titel :
Industry Applications Society Annual Meeting, 1993., Conference Record of the 1993 IEEE
Conference_Location :
Toronto, Ont.
Print_ISBN :
0-7803-1462-X
DOI :
10.1109/IAS.1993.299200
