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Adaptive overvoltage protection for multifunction LED chain

A technology of overvoltage and voltage feedback, which is applied in the direction of emergency protection circuit devices for limiting overcurrent/overvoltage, emergency protection circuit devices, and the use of semiconductor lamps, and can solve problems such as reducing the length of LED chains

Active Publication Date: 2017-12-08
INFINEON TECH AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One or more of the LEDs may sometimes be bypassed, temporarily reducing the length of any given LED chain

Method used

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  • Adaptive overvoltage protection for multifunction LED chain
  • Adaptive overvoltage protection for multifunction LED chain
  • Adaptive overvoltage protection for multifunction LED chain

Examples

Experimental program
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example 1

[0063] Example 1. A method comprising: determining, by a device of a system, a voltage feedback value representative of a voltage level of a power signal being provided to a selectively active plurality of load elements; and by said device and based on said plurality of active The number of load elements out of load elements adjusts the voltage level of the power signal such that the voltage feedback value remains less than or equal to the overvoltage threshold.

example 2

[0064] Example 2. The method of example 1, further comprising: determining the overvoltage threshold based on a number of load elements of the plurality of load elements that are active.

example 3

[0065] Example 3. The method of any combination of examples 1-2, further comprising scaling the voltage feedback value based on a number of load elements of the plurality of load elements that are active.

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Abstract

In one example, a method includes determining, by a device of a system, a voltage feedback value that represents a voltage level of a power signal being provided to a plurality of load elements that are selectively active. In this example, the method also includes adjusting, by the device and based on a quantity of load elements of the plurality of load elements that are active, the voltage level of the power signal such that the voltage feedback value remains less than or equal to an overvoltage threshold.

Description

technical field [0001] The present invention relates to light emitting diodes (LEDs), and in particular, to circuit arrangements and techniques for protecting LEDs from damage. Background technique [0002] Some applications, such as automated lighting, may involve LED chains consisting of many LEDs. The number of LEDs in a given chain and the number of chains can vary depending on the specific application. One or more of the LEDs may be bypassed at times, temporarily reducing the length of any given LED chain. Since different numbers of LEDs in the chain are used, the driver circuit can control the amount of power provided to the LED chain. Contents of the invention [0003] In one example, a method includes determining, by a device of a system, a voltage feedback value representative of a voltage level of a power signal being provided to a selectively active plurality of load elements; and by the device and based on the active The number of load elements in the plural...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08H02H9/04H05B44/00H05B45/50
CPCH02H9/041H05B45/37H05B45/50H05B45/44Y02B20/30
Inventor F.弗拉贾科莫M.加尔瓦诺P.米拉内西R.彭佐
Owner INFINEON TECH AG
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