Scheme for sensing ballast lamp current
US5973437A · kind A · utility
14Cited by
6References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 10, 1997 |
| Grant date | Oct 26, 1999 |
| Priority date | — |
| Expiry date | Nov 10, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S315/07
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.