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Driver circuit for an LED

A technology of LED driving and driving circuit, applied in the field of LED control, can solve the problems of phosphor change, temperature management effect of secondary optical devices, light flicker and so on

Active Publication Date: 2015-07-08
TRIDONIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, current LED lighting systems often have the disadvantage that color or brightness may change due to aging or due to replacement of individual LEDs or LED assemblies
Additionally, secondary optics have an impact on temperature management by blocking thermal radiation
In addition, due to aging and heat, the phosphor of the LED may change
[0005] Brightness changes are usually only possible with complex control circuits and cannot be simply interfaced with common dimmers due to the flickering of light that occurs when working with most dimmers, and even these dimmers cannot normal work

Method used

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  • Driver circuit for an LED
  • Driver circuit for an LED
  • Driver circuit for an LED

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no. 1 approach ；

[0018] figure 2 shows a second embodiment of the device of the invention;

[0019] image 3 Another embodiment of the device of the present invention is shown;

[0020] Figure 4 Another embodiment of the device according to the invention is shown.

[0021] The following combination is based on figure 1 The present invention will be described by the first embodiment with LED driving circuit.

[0022] The LED driving circuit has a power supply interface, a filter circuit (L1), a rectifier (GR1), an inductor (L2) and a switch (S1). The rectifier (GR1) is followed by a snubber element (C1) which preferably only serves to filter out high-frequency voltage variations without exerting a significant smoothing effect on the voltage at the output of the rectifier (GR1). The buffer element ( C1 ) is, for example, a capacitor, preferably a smoothing capacitor. The inductor (L2) preferably has a primary coil (L2p) and a secondary coil (L2s) coupled to the primary coil.

[0023] W...

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Abstract

The invention relates to a driver circuit for an LED, comprising a connection for a mains voltage, a rectifier (GR1), a filter circuit (L1), an inductor(L2), and a switch (S1), wherein the inductor (L2) is magnetized when the switch(S1) is closed, and the inductor (L2) is demagnetized when theswitch (S1) is opened, and the current feeds the LED through theinductor (L2) at least during the phase of the demagnetization,wherein the switch (S1) is always opened only when the current through theswitch (S1) has reached a specified threshold, and thespecified threshold depends on the present amplitude of thesupply voltage Vin.

Description

technical field [0001] The invention relates to an LED driver circuit according to the preamble of claim 1 and also to a method of controlling an LED according to the preamble of claim 21 . Background technique [0002] This driving circuit is used in lighting systems to realize colored or regional lighting for rooms, roads or escape routes. Typically, lighting devices are driven by driver devices and activated when required. For this lighting, organic or inorganic light emitting diodes (LEDs) can be used as light sources. [0003] For lighting, light-emitting diodes are increasingly used as light sources instead of gas-discharge lamps and incandescent lamps. The efficiency and the amount of light emitted by a light emitting diode continue to rapidly increase, so that it has been used in various fields of daily lighting. Light-emitting diodes, however, are point sources of light and emit strongly concentrated light. [0004] However, current LED lighting systems often ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B33/0815H05B45/3725H05B45/382
Inventor 迈克尔·齐默尔曼爱德华多·佩雷拉
Owner TRIDONIC
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