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Method and circuit arrangement for feeding a series connection of n led units

A series connection and circuit device technology, applied in lighting devices, signal devices, transportation and packaging, etc., can solve the problems of complex activation logic circuits, inability to ensure uniform brightness, etc., and achieve the effect of increasing traffic safety

Active Publication Date: 2021-01-12
ZKW GRP GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The described solution requires three controlled switches per LED, and a correspondingly complex activation logic; however, first of all, there is the following disadvantage: in the event of operating voltage fluctuations, a uniform brightness of the LEDs used is not ensured, and more precisely one or more LEDs remain dark even in the

Method used

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  • Method and circuit arrangement for feeding a series connection of n led units
  • Method and circuit arrangement for feeding a series connection of n led units
  • Method and circuit arrangement for feeding a series connection of n led units

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Embodiment Construction

[0031] figure 1 A block diagram of a first exemplary embodiment of a circuit arrangement according to the invention is shown using the example of activating 4 light-emitting diodes (hereinafter referred to as LEDs). In this example, a vehicle battery 2 in a motor vehicle is maintained as far as possible in a state of charge with a target voltage of 12 volts with the help of an energy management system 1 , which is not shown in more detail and in particular Yes includes alternator and charge controller. Actual battery voltage via U B indicated, and typically 13.5 to 15 volts during driving operations.

[0032] The voltage U B is to be used to feed 4 series-connected LED units LED1, LED2, LED3 and LED4, which in the simplest case consist of individual LEDs and are also shown in this way for simplicity; However, it should be clear that the LED units may also each comprise a plurality of LEDs, in particular when the plurality of LEDs are combined on a chip. The switching unit...

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Abstract

for operating voltages from fluctuations (U B ) voltage source (2) via a controlled power supply (5) to a method and a circuit arrangement for feeding n LED units (LED1 to LED5) of a lighting unit of a motor vehicle, wherein when the operating voltage (U B ) down, the LED units (LED1 to LED5) are interconnected, and in particular k LED units (LED1 to LED5 ) short circuit in which the current continues to flow through (n‑k) LED units simultaneously. A storage unit (7) for storing information about the weights related to the determined priority of the LED units is assigned to the control unit (3) for activating said power supply, provided with a switch matrix (4', S 1 to S 4 ), and in particular n controlled switches (S 1 to S 4 ) circuit arrangement, and the control unit (3) is configured to compare the operating voltage and / or the current of the power supply (I S ) with a predefinable threshold and interconnecting said LED units according to this comparison and said weight.

Description

technical field [0001] The invention relates to a method for feeding n LED units of at least one lighting unit of a motor vehicle from a voltage source with a fluctuating operating voltage via a controlled power supply, wherein the individual LED units are connected in series depending on the level of said operating voltage connection and / or parallel connection and / or bypass. [0002] The invention furthermore relates to a method for operating from a fluctuating operating voltage (U B A circuit arrangement for feeding n LED units from a voltage source of ) via a controlled power supply and comprising a control unit for activating said power supply and a switch matrix assigned to said LED units and comprising controlled switches, Wherein the control unit is configured to connect the respective LED units in series and / or in parallel and / or bypass the LED units according to the level of the operating voltage. [0003] An LED unit within the scope of the present invention is und...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B45/48H05B45/30H05B45/10B60Q1/04H05B44/00
CPCB60Q1/16F21S41/663H05B45/44H05B45/48H05B45/00B60Q1/0408
Inventor J.巴克M.比伊森伯格S.米伊德勒
Owner ZKW GRP GMBH
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