High power factor electronic ballast with low lamp current peak ratio
US6255785A · kind A · utility
Inventors
Key dates
| Filing date | Mar 29, 2000 |
| Grant date | Jul 3, 2001 |
| Priority date | — |
| Expiry date | Mar 29, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B41/28
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A high power factor electronic ballast for fluorescent lamps having low lamp current peak ratio and which includes a bridge rectifier for rectifying a commercial power supply voltage, a high frequency oscillator using an output voltage from a bridge rectifier as its supply voltage, a first supplementary power source to supply the high frequency oscillator a voltage by superimposing two supplementary voltages generated from a portion of high frequency current in a load on the output voltage from the bridge rectifier, and a second supplementary power source to supply the high frequency oscillator a direct offset voltage generated from a portion of high frequency current in the load to improve the input current waveform of the bridge rectifier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.