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File:Power supply with constant current calculation.JPG

Power_supply_with_constant_current_calculation.JPG ‎(695 × 415 pixels, file size: 37 KB, MIME type: image/jpeg)

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Description
English: Lot of electricians became discouraged, when they working with electronic power supplies for LED lamps. Why?
  • -Cause old familiar power supplies for halogen lamps give constant voltage and current chanes with the load. But power supplies for LED lamps (that appeared not so long ago) gives constant current, but voltage changes with the load. Sometimes it may change from 8V to 95V. And there become problem with isulation, cause installations up to 48V and exceed 48V require different insulation. How to be?
  • You may solve this problem by using power supply with constant voltage. But there will appear new problem - in the begining of line lamps will shine more brightly, than in the end of line and lamps in the end of line will shine weakly. Also you'll have puzzle with series resistors. Best solution of this problem is power supply with constant current. But how to calculate it correctly?
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Author Dmitry G
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current19:08, 15 February 2011Thumbnail for version as of 19:08, 15 February 2011695 × 415 (37 KB)Dmitry G (talk | contribs){{Information |Description ={{en|1=Lot of electricians became discouraged, when they working with electronic power supplies for LED lamps. Why? * -Cause old familiar power supplies give constant voltage and curren

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