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_MD_INDEX : Sonstiges : Tech Erläuterungen

Reihen- und Parallelschaltung von LED _MD_POPULAR 
_MD_WRITTENBY @meiseAC
_MD_DATE Sat, 19.02.2005
_MD_HITS 4044

_MD_RATINGC  (_MD_RATING)
 
123>

Allgemeines zu LED's
Die Durchlassspannungen einzelner LED's hängen von dem verwendeten Substrat ab, mit denen der Grundsstoff dotiert worden ist. Damit wird auch die Wellenlänge also die Lichtfarbe bestimmt.

Ausgenommen Low Current LED's, die schon bei wesentlich weniger Strom ihre volle Leuchtkraft entwickeln.

Allerdings betreibt man LED's nicht mit ihrer Durchlassspannung sondern mit ihrem Typ. Durchlassstrom.Deshalb spricht man in diesem Zusammenhang auch von einer "Konstantstromquelle".

Weil Dioden eine extrem Steile Kennlinie aufweisen, und man mit der Konstantstromquelle statt mit der Konstantspannungsquelle besser den optimalen Arbeitspunkt auf der Kennlinie einstellen kann.

Jede LED funktioniert übrigens auch an Wechselstrom (nicht Steckdose!! sondern kleines Netzteil ohne Gleichrichtung mit der richtigen Spannung) dabei ist sogar die Polung der LED egal, aber die LED flimmert dann mit 50 Hz.
Hier die einzelnen Durchlassspannungen
Rotca. 1,5 Vca. 20-25 mA
Gelbca. 1,7 Vca. 20-25 mA
Grünca. 2,1 Vca. 20-25 mA
Blauca. 3,0 Vca. 30 mA
Weißca. 3,0 Vca. 30 mA


 
123>

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Deprecated
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Blocks
Login: Not cached
Main Menu: Not cached
Herzlich Willkommen: Not cached
Usermenü: Not cached
PD-Members: Not cached
Site Info: Not cached
Umfragenblock: Not cached
Google Adsense (klein): Not cached
Partner: Not cached
Total: 9
Extra
Included files: 201 files
Memory usage: 1575624 bytes
Timers
XOOPS took 0.141 seconds to load.
XOOPS Boot took 0.009 seconds to load.
Module init took 0.081 seconds to load.
XOOPS output init took 0.045 seconds to load.
Module display took 0.005 seconds to load.
Page rendering took 0.001 seconds to load.