Scheme for sensing ballast lamp current

Details Scheme for sensing ballast lamp current Scheme for sensing ballast lamp current

1997-11-10

1999-10-26

Shingleton, Michael B

Electrical generator or motor structure

Non-dynamoelectric

Thermal or pyromagnetic

315219, 315DIG7, 315224, H05B 3702

Patent

active

059734370

ABSTRACT:
A light source including a ballast characterized by a resonant frequency and including a reference bus and a transformer having a secondary winding. The fluorescent lamp is partially covered by a shield, connected to the reference bus and coupled to the secondary winding. The ballast further includes a current sensor connected between the secondary winding and reference bus for sensing current flow through at least the lamp including that portion of lamp current attributable to parasitic capacitances affecting the resonant frequency.

REFERENCES:
patent: 4256992 (1981-03-01), Luursema
patent: 5039921 (1991-08-01), Kakitani
patent: 5048033 (1991-09-01), Donahue
patent: 5075602 (1991-12-01), Overgoor et al.
patent: 5367223 (1994-11-01), Eccher
patent: 5466992 (1995-11-01), Nemirow et al.

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