Linear solid-state lighting compatible with ballasts in double ends and operable with AC mains in a single end
US9668308B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 30, 2016 |
| Grant date | May 30, 2017 |
| Priority date | — |
| Expiry date | Jun 30, 2036 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B70/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A linear light-emitting diode (LED) tube lamp using a six-diode combination and a ballast compatible and AC mains operable (BA) LED driving circuit operate normally with AC mains in a single end and with an electronic ballast in double ends. The BA LED driving circuit configured to operate in a wide range of input voltages and frequencies, especially for various high voltages and high frequencies associated with various electronic ballasts to provide a regulated power and a current from either electronic ballast or AC mains. With a cycle-by-cycle current control and power switching at a constant on-time and varied off-time, an over-rated surge current is limited, preventing occasional fire hazards occurred in the ballast. An additional frequency sensitive device is used to prevent a possible electric shock from occurring for both configurations during initial installation and re-lamping, thus no shock protection switches needed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.