High-efficiency self-regulated electronic ballast with a single characteristic curve for operating high-pressure sodium vapor lamps
US6137238A · kind A · utility
Inventors
Key dates
| Filing date | Sep 24, 1998 |
| Grant date | Oct 24, 2000 |
| Priority date | — |
| Expiry date | Sep 24, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B41/392
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A high-efficiency self-regulated electronic ballast with a single characteristic curve for operating high-pressure sodium vapor lamps by means of an AC-to-DC converter circuit, a power factor correcting regulator circuit for reducing harmonic distortion, a high-frequency DC-to-AC converter circuit, a reducing autotransformer circuit with a current limiting inductor and an igniter, and a light-controlled switching circuit. The ballast is characterized in that it supplies a controlled high-frequency alternating voltage to the assembly of the limiting inductor and the lamp, whereby the ballast has a single characteristic curve, and in that the average power consumption of the lamp is determined on the basis of the single characteristic curve of the ballast within the standard regulation trapezoid defining the average consumption of the ballast/lamp assembly. Said ballast has uniform regulation characteristics, high electrical efficiency, a unitary power factor, low harmonic distortion, a high ballast efficiency factor, and a low stroboscopic effect.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.