Startup circuit for electronic ballasts for instant-start lamps
US5177408A · kind A · utility
70Cited by
4References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 19, 1991 |
| Grant date | Jan 5, 1993 |
| Priority date | — |
| Expiry date | Jul 19, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B70/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A start-up delay circuit for an electronic ballast for "instant-start" type fluorescent lamps of the type having an electronic converter powered by an active electronic preregulator. The converter is an inductive-capacitive parallel-resonant push-pull circuit or other type of current-fed power-resonant circuit. The preregulator may be a boost-type. The start-up circuit may be either a resistor and zener diode or resistor, capacitor and diac network or programmable unijunction transistor circuit connected between the preregulator output and an oscillation-enabling input of the converter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.