AC LED lamps and control methods thereof
US9374863B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 15, 2014 |
| Grant date | Jun 21, 2016 |
| Priority date | — |
| Expiry date | Dec 27, 2034 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/30
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A LED lamp has LED groups, a path controller, a power bank, and a bank controller. The LED groups are arranged in series between a rectified input voltage and a ground voltage. The path controller controls path switches, each path switch for coupling a corresponding LED group to the ground voltage. The power bank is coupled between the rectified input voltage and the ground voltage, having a capacitor and a discharge switch. The capacitor is configured to be charged when the rectified input voltage exceeds a capacitor voltage of the capacitor. The discharge switch is connected between the capacitor and the rectified input voltage. The bank controller determines a connection period and controls the discharge switch in response to a signal turning ON one of path switches, in order to make the capacitor capable of being discharged to the rectified input voltage during the connection period.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.