Electronic ballast circuit
US4388562A · kind A · utility
72Cited by
11References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 6, 1980 |
| Grant date | Jun 14, 1983 |
| Priority date | — |
| Expiry date | Nov 6, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S315/07
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electronic ballast circuit for powering a plurality of fluorescent lamps or the like from an unsmoothed DC voltage source includes a sine wave converter operatively connected to receive said DC voltage, for generating a high frequency alternating voltage of sufficient amplitude to power said lamps. The converter comprises a tank circuit and two push-pull transistors connected thereto and a current source capacitively coupled to said tank circuit for providing base drive alternately to each transistor. A lamp filament heater current cancellation circuit reduces power drain once the lamps have turned on.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.