Title :
Hybrid electronic ballast operating the HPS lamp at constant power
Author_Institution :
Escola Politecnica, Sao Paulo Univ., Brazil
Abstract :
A hybrid solid-state ballast that operates high-pressure sodium (HPS) lamps at main frequency with constant power through rated life is described. The system utilizes two inductors connected in series and a bidirectional semiconductor switch connected in parallel to one of them. A lamp starting circuit has also been included in the ballast. The static switch, with phase angle control provided by power feedback, actuates on lamp current, compensating variations of the main voltage and increases of lamp arc voltage. The system offers the following: (1) an increase of lamp life and system lumen maintenance; (2) power factor and total harmonic distortion of line current comparable to conventional lag ballast; and (3) operating cost savings, both in terms of energy cost and lamp replacement cost
Keywords :
harmonic distortion; lamp accessories; metal vapour lamps; power convertors; power factor correction; power inductors; power semiconductor switches; power system harmonics; sodium; starting; switching circuits; bidirectional semiconductor switch; electronic ballast; high-pressure sodium lamps; hybrid solid-state ballast; lamp life; lamp starting circuit; line current; operating cost savings; phase angle control; power factor; power feedback; series-connected inductors; static switch; system lumen maintenance; total harmonic distortion; Costs; Electronic ballasts; Feedback; Frequency; Inductors; Lamps; Power semiconductor switches; Reactive power; Solid state circuits; Voltage control;
Journal_Title :
Industry Applications, IEEE Transactions on
