Patent · US Active

Method for controlling an electrical light source by pulse width modulation

US8093833B2 · kind B2 · utility

2Cited by

4References

5Claims

0Family size

Assignee

Coni Temic microelectronic GmbH · DE

Inventors

Uli Joos · Nonnenhorn, DE
Christian Voss · Geretsried, DE
Josef Schnell · Vergennes, US
Jochen Zwick · Markdorf, DE

Key dates

Filing date	Jul 14, 2005
Grant date	Jan 10, 2012
Priority date	—
Expiry date	Aug 25, 2027

Classification

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

Abstract

Disclosed is for controlling a light source by pulse width modulation of a supply voltage. The supply voltage, or a parameter dependent thereon, is measured and the pulse width is controlled as function of the measured value. The supply voltage or parameter is measured at least twice during the pulse and may be cyclically measured. The pulse width of the current or a subsequent pulse is matched to the recorded value of the supply voltage or the parameter. A total value is generated from all of the measured values and compared with a given value and the pulse width of subsequent pulses are matched as function of the difference between the total value and the given value.

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