Control gear for high intensity gas discharge lighting
US4881011A · kind A · utility
Assignees
Inventor
Key dates
| Filing date | Oct 21, 1987 |
| Grant date | Nov 14, 1989 |
| Priority date | — |
| Expiry date | Oct 21, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B41/3928
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A control gear for a high intensity discharge lamp comprising a switch element, and an oscillator connected to drive the switch element through the intermediary of a variable mark-space ratio driver arrangement. The switch element switches current in a series resonant circuit including the primary winding of a transformer, across the secondary winding of which the lamp is connected. A feedback circuit which receives signals controls the mark-space ratio to regulate the power consumed by the lamp in a closed loop. Initially, the mark-space ratio is set at a starting level such that a very high voltage is generated in the resonant circuit to cause starting of the lamp.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.