Details

Autor(en) / Beteiligte

• Kaiser, W.
• Chabu, I.E.
• Lourenco, E.A.C.

Titel

Design of a hybrid ballast with magnetic shunts: application to control of HID lamps

Ist Teil von

• IAS '97. Conference Record of the 1997 IEEE Industry Applications Conference Thirty-Second IAS Annual Meeting, 1997, Vol.3, p.2270-2275 vol.3

Ort / Verlag

IEEE

Erscheinungsjahr

1997

Link zum Volltext

• IEEE_Xplore

Quelle

IEEE Electronic Library (IEL)

Beschreibungen/Notizen

• A procedure to design a lag ballast with magnetic shunts for HID lamps is proposed. A bidirectional semiconductor switch with phase angle control, connected in parallel to one of the ballast coils, acts on lamp power. The static switch control signal is provided by a power feedback loop that actuates on lamp current, compensating variations of the main voltage and/or lamp parameters. This system saves energy and extends lamp life. Measurements on a 70 W high-pressure sodium (HPS) lamp prototype ballast are presented. The dependence of the inductances on the magnetic circuit parameters is emphasized. Power factor and total harmonic distortion of line current are comparable to a conventional lag ballast.