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Methods and apparatus for controlling series-connected leds

A technology of controller and series current, which is applied in the direction of lighting devices, the use of semiconductor lamps, electroluminescent light sources, etc., and can solve problems such as reducing efficiency

Active Publication Date: 2011-11-02
SIGNIFY NORTH AMERICA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If efficiency is an outstanding requirement, these systems must have practical ratios with consistent numerators or denominators; therefore, at higher currents the input or output is low voltage, which effectively reduces efficiency

Method used

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  • Methods and apparatus for controlling series-connected leds
  • Methods and apparatus for controlling series-connected leds
  • Methods and apparatus for controlling series-connected leds

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Embodiment Construction

[0055] Various embodiments of the present invention are described below, including some that are particularly relevant to LED-based light sources. It should be understood, however, that the present disclosure is not limited to any particular manner of implementation, and that the various embodiments explicitly discussed herein are primarily for purposes of illustration. For example, the various concepts discussed herein may be suitably implemented in a variety of environments that include LED-based light sources, environments that include other types of light sources that do not include LEDs, environments that include combinations of LEDs and other types of light sources, and suitably implemented in an environment including only lighting-independent devices or a combination of lighting-independent devices and various types of light sources.

[0056] figure 1 An example of a lighting unit 100 according to an embodiment of the present disclosure is shown. See, for example, U.S...

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Abstract

Methods and apparatus for controlling series-connected LEDs. Two or more LEDs are connected in series between a first node and a second node, wherein a series current flows between the nodes when an operating voltage is applied across the nodes. One or more controllable current paths are connected in parallel with at least a first LED for at least partially diverting the series current around at least the first LED. A controller monitors at least one parameter representative of the operating voltage, determines a maximum number of the series-connected LEDs that can be energized by the operating voltage, and controls the controllable current path(s) so as to increase an amount of the series current that is diverted around at least the first LED when the maximum number is less than a total number of all of the LEDs connected in series. In one example, the foregoing may be implemented as an integrated circuit package to provide a lighting apparatus suitable for automotive applications.

Description

Background technique [0001] Light-emitting diodes (LEDs) are semiconductor-based light sources that are commonly used in low-power instrumentation and equipment applications for indication purposes. LEDs are conventionally available in a variety of colors (eg, red, green, yellow, blue, white) based on the types of materials used in their fabrication. More recently, this color diversity of LEDs has been exploited to create novel LED-based light sources with sufficient light output for new space lighting applications. For example, as described in U.S. Patent No. 6,016,038, multiple LEDs emitting different colors can be combined in a lighting fixture, where the intensity of each different colored LED varies independently to produce multiple different hues. ). In one example of such an apparatus, red, green and blue LEDs are used in combination to literally produce hundreds of different shades of color from a single lighting fixture. Additionally, the relative intensities of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B33/08H05B44/00
CPCY02B20/383
Inventor I·A·利斯
Owner SIGNIFY NORTH AMERICA CORP