Discharge lamp lighting apparatus for lighting multiple discharge lamps
US7239091B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 28, 2005 |
| Grant date | Jul 3, 2007 |
| Priority date | — |
| Expiry date | Nov 28, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B41/2827
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A discharge lamp lighting apparatus is provided for lighting a plurality of discharge lamps including one reference lamp and at least one controllable lamp. First variable inductance element and lamp current detecting unit are connected to the reference lamp, second variable inductance and lamp current unit are connected to the controllable lamp, and a lamp current controlling circuit is connected to each of the first and second variable inductance elements. An output signal from the second lamp current detecting unit and also an output signal as a reference signal from the first lamp current detecting unit are connected to the lamp current controlling circuit for the controllable lamp, whereby the lamp current of the controllable lamp is controlled. The reference output signal is also connected to a control circuit, and the lamp currents of the reference and controllable lamps are controlled further by the on/off operation of the switching elements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.