Patent · US Active

Method and device for obtaining conduction angle, method and device for driving LED

US8558477B2 · kind B2 · utility

38Cited by

3References

12Claims

0Family size

Assignee

OSRAM Gesellschaft mit beschraenkter Haftung · DE

Inventors

Luca Bordin · Birkenfeld, DE
Yuli Chen · Tangxia, CN
Shijun Nie · Tangxia, CN
Wei Sin TAN · Nanhu, CN

Key dates

Filing date	Apr 29, 2011
Grant date	Oct 15, 2013
Priority date	—
Expiry date	Jan 17, 2032

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02B20/30
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

In various embodiments, a method for obtaining a conduction angle of a trailing edge dimmer is provided. The method may include determining a time point t0 when the trailing edge dimmer starts to be conductive; determining an earliest time point t1 when a deviation from an ideal waveform appears; and determining the conduction angle t1-t0 of the trailing edge dimmer based on the earliest time point t1 when the deviation from the ideal waveform appears and the time point t0 when the trailing edge dimmer starts to be conductive.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.