AC LED lighting systems and control methods without flickering
US9510415B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 30, 2015 |
| Grant date | Nov 29, 2016 |
| Priority date | — |
| Expiry date | Nov 30, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B45/48
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A LED lighting system performs no flicking. A rectifier receives an AC input voltage to generate a rectified input voltage at an input power line and a ground voltage at a ground line. A LED string comprises LEDs connected in series to have a main anode and a main cathode. The main anode is coupled to the input power line. A power bank is connected to the input power line and the main cathode. The circuit conducts a first driving current from the main cathode to the ground line, and a second driving current from the power bank to the ground line. The second driving current increases electric energy stored in the power bank. Both the first and second driving currents flow through the LED string. The power bank releases the electric energy to make at least one of the LEDs illuminate when the AC input voltage is about 0V.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.