Patent · US Active

Driver arrangement for LED lamps

US7830094B2 · kind B2 · utility

3Cited by

6References

19Claims

0Family size

Assignee

OSRAM Gesellschaft mit beschraenkter Haftung · DE

Inventors

Xi Yuan He · Suzhou, CN
Rui Ma · 流花街道, CN
Giovanni Scilla · Regensburg, DE

Key dates

Filing date	Jun 13, 2007
Grant date	Nov 9, 2010
Priority date	—
Expiry date	Jun 14, 2029

Classification

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

Abstract

A driver arrangement for LED light sources includes a transformer having primary and secondary winding connections. A first electronic switch (SW1) controls current flow through the primary winding, and a sensing resistor is coupled to the primary winding to produce a current sensing signal. A second electronic switch (SW2) is sensitive to the sensing signal to switch off SW1 as current flow through the primary winding reaches a given threshold. SW1 is thus alternatively turned-on and off in alternating turn-on and switch-off phases to power the LED light source via the secondary winding. SW1 is a field effect transistor, preferably a MOSFET. The transformer is SELV-rated. The sensing resistor may be a variable resistor to adjust the duration of the on/off phases to permit controlled dimming.

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