Method and circuit arrangement for feeding a series circuit of n LED units

A series connection and circuit device technology, applied in signal devices, lighting 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: 2017-08-18
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

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  • Method and circuit arrangement for feeding a series circuit of n LED units
  • Method and circuit arrangement for feeding a series circuit of n LED units
  • Method and circuit arrangement for feeding a series circuit 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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PUM

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Abstract

The invention relates to a method and to a circuit arrangement for feeding n LED units (LED1,...LED5) of a lamp unit of a motor vehicle by means of a controlled current source (5) from a voltage source (2) having fluctuating operating voltage (UB), in which the connecting of the LED units (LED1,...LED5) in the event of the operating voltage (UB) falling is carried out whilst taking into account a stored weighting with regard to the priority assigned to the individual LED units, in particular each k LED units (LED1,...,LED5) of a series circuit are short-circuited, wherein at the same time (n-k) LED units remain energized. At the same time, a control unit (3) for driving the current source is assigned a storage unit (7) for storing information about weightings relating to the priority of specific LED units, a switching matrix (4', S1,..., S4), in particular a switch arrangement of n controlled switches (S1,..., S4) each bridging the LED units (LED1,..., LED4, LED5) is provided, and the control unit (3) is configured to compare the operating voltage and / or the current (IS) from the current source with predefined threshold values and to carry out the connection of the LED units on the basis of this comparison and the weighting.

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 Applications(China)
IPC IPC(8): H05B33/08H05B44/00
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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