Discharge lamp lighting circuit for increasing electric power fed in initial lighting of the lamp
US5491387A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 25, 1993 |
| Grant date | Feb 13, 1996 |
| Priority date | — |
| Expiry date | Jun 25, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S315/07
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A discharge lamp lighting apparatus includes a voltage raising element for raising a DC input voltage, a pulse generator for varying the output voltage output by the voltage raising element is a pulse voltage having a given pulse width and outputting the pulse voltage, a bridge circuit for applying the pulse voltage to a discharge lamp, a voltage detecting element for detecting a voltage applied to the discharge lamp, a current detecting element for detecting a current running through the discharge lamp, an adder for adding a first amplification signal output by a first amplifier and a second amplification signal output by a second amplifier together, elements for delaying outputs from the amplifiers, and a pulse width modulator for controlling the pulse width of the pulse voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.