LED retrofit lamp
US9480123B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 18, 2014 |
| Grant date | Oct 25, 2016 |
| Priority date | — |
| Expiry date | Aug 18, 2034 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/30
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention relates to an LED retrofit lamp adapted for operation with an alternating current. The LED lamp comprises an LED unit, first and second switching devices (e.g., first and second relays), a startup voltage supply unit (1010) coupled in parallel to the first switching device, an ignition detection unit (1020) coupled in parallel to the second switching device, and a switch drive unit (1030) for setting the first and second switching devices to a conducting state. If one of the first and second switching devices is shorted either no startup supply voltage or no detection signal is provided, such that the failure is indicated externally to a user.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.