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Constant current power driver circuit for automotive light assembly

A driver circuit, constant current technology, used in vehicle parts, electric light sources, electrical components, etc.

Active Publication Date: 2018-06-29
AUTOSYST AMERICA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If one or more of the LEDs fails, vehicle manufacturers typically require that all LEDs stop emitting light, thereby disabling the light assembly

Method used

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  • Constant current power driver circuit for automotive light assembly
  • Constant current power driver circuit for automotive light assembly
  • Constant current power driver circuit for automotive light assembly

Examples

Experimental program
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Embodiment Construction

[0017] Exemplary embodiments will now be described more fully with reference to the accompanying drawings.

[0018] figure 1 A vehicle 2 is shown having a vehicle light assembly 10 as shown. The vehicle light assembly 10 uses a plurality of light emitting diodes (LEDs) to generate light. The light emitting diodes 13 may be white or more preferably correspond to the desired appearance of the assembly, eg yellow, orange or red. Additionally, the intensity of LEDs 13 may range from less than 1 lumen to 1000 lumens. However, it should be understood that in other applications, the intensity of the light emitting diodes 13 may also exceed this range. As shown, the vehicle light assembly 10 is used as a tail light assembly of the vehicle 2, but it should be understood that the concepts set forth in this disclosure are equally applicable to other light assemblies, such as headlights or turn indicators.

[0019] figure 2 A constant current driver circuit 20 that may be used in a ...

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PUM

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Abstract

The invention relates to a constant current power driver circuit for an automotive light assembly. The constant current driver circuit is provided for a vehicle light assembly having a plurality of light strings arranged in parallel with each other. Each light string in the plurality of light strings includes at least one light emitting diode (LED) electrically coupled in series with an LED driver. The driver circuit includes a bias circuit, a voltage regulator circuit and a sense circuit. The bias circuit is electrically coupled to each LED driver at a common node and, in absence of a triggersignal, operates to supply a bias voltage to each LED driver. The voltage regulator circuit is electrically coupled to the common node and regulates the bias voltage supplied by the bias circuit. Thesense circuit is configured to detect on / off state of the voltage regulator and, in response to detecting an off state for the voltage regulator, provides a trigger signal to the bias circuit.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of U.S. Provisional Patent Application No. 62 / 437809, filed December 22, 2016, which is incorporated herein in its entirety. technical field [0003] The present disclosure relates to constant current driver circuits that may be used in automotive light assemblies. Background technique [0004] Automobiles and other motor vehicles use different types of light assemblies, including headlights, warning lights, and signal lights. Rather than relying on a single light bulb, light assemblies are beginning to rely on multiple light emitting diodes (LEDs) to generate the light emitted by the assemblies. For safety purposes, it is important to keep the light produced by such light assemblies bright. If one or more of the LEDs fails, vehicle manufacturers typically require that all LEDs cease to illuminate, thereby disabling the light assembly. [0005] Accordingly, it would be desirable t...

Claims

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Application Information

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IPC IPC(8): H05B33/08H05B44/00H05B45/50
CPCH05B45/395H05B45/50B60Q1/0017B60Q1/1407B60Q1/2696B60Q11/005H05B45/46Y02B20/30H05B45/48B60Q1/18B60Q1/44
Inventor 理查德·J·沃尔特斯
Owner AUTOSYST AMERICA INC