element14 Community
element14 Community
    Register Log In
  • Site
  • Search
  • Log In Register
  • Community Hub
    Community Hub
    • What's New on element14
    • Feedback and Support
    • Benefits of Membership
    • Personal Blogs
    • Members Area
    • Achievement Levels
  • Learn
    Learn
    • Ask an Expert
    • eBooks
    • element14 presents
    • Learning Center
    • Tech Spotlight
    • STEM Academy
    • Webinars, Training and Events
    • Learning Groups
  • Technologies
    Technologies
    • 3D Printing
    • FPGA
    • Industrial Automation
    • Internet of Things
    • Power & Energy
    • Sensors
    • Technology Groups
  • Challenges & Projects
    Challenges & Projects
    • Design Challenges
    • element14 presents Projects
    • Project14
    • Arduino Projects
    • Raspberry Pi Projects
    • Project Groups
  • Products
    Products
    • Arduino
    • Avnet Boards Community
    • Dev Tools
    • Manufacturers
    • Multicomp Pro
    • Product Groups
    • Raspberry Pi
    • RoadTests & Reviews
  • Store
    Store
    • Visit Your Store
    • Choose another store...
      • Europe
      •  Austria (German)
      •  Belgium (Dutch, French)
      •  Bulgaria (Bulgarian)
      •  Czech Republic (Czech)
      •  Denmark (Danish)
      •  Estonia (Estonian)
      •  Finland (Finnish)
      •  France (French)
      •  Germany (German)
      •  Hungary (Hungarian)
      •  Ireland
      •  Israel
      •  Italy (Italian)
      •  Latvia (Latvian)
      •  
      •  Lithuania (Lithuanian)
      •  Netherlands (Dutch)
      •  Norway (Norwegian)
      •  Poland (Polish)
      •  Portugal (Portuguese)
      •  Romania (Romanian)
      •  Russia (Russian)
      •  Slovakia (Slovak)
      •  Slovenia (Slovenian)
      •  Spain (Spanish)
      •  Sweden (Swedish)
      •  Switzerland(German, French)
      •  Turkey (Turkish)
      •  United Kingdom
      • Asia Pacific
      •  Australia
      •  China
      •  Hong Kong
      •  India
      •  Korea (Korean)
      •  Malaysia
      •  New Zealand
      •  Philippines
      •  Singapore
      •  Taiwan
      •  Thailand (Thai)
      • Americas
      •  Brazil (Portuguese)
      •  Canada
      •  Mexico (Spanish)
      •  United States
      Can't find the country/region you're looking for? Visit our export site or find a local distributor.
  • Translate
  • Profile
  • Settings
Personal Blogs
  • Community Hub
  • More
Personal Blogs
Legacy Personal Blogs led tunnel light 20w
  • Blog
  • Documents
  • Mentions
  • Sub-Groups
  • Tags
  • More
  • Cancel
  • New
  • Share
  • More
  • Cancel
Group Actions
  • Group RSS
  • More
  • Cancel
Engagement
  • Author Author: Former Member
  • Date Created: 11 Jun 2012 9:18 AM Date Created
  • Views 431 views
  • Likes 0 likes
  • Comments 2 comments
Related
Recommended

led tunnel light 20w

Former Member
Former Member
11 Jun 2012

With the light-emitting diode (LED) reduced production costs, the use of more and more common range of applications from handheld devices to the automotive, architectural lighting, and other fields. LED reliability (service life of more than 50,000 hours), efficiency (more than 120 lumens per watt), and near real-time response characteristics has become an attractive light source. LED can produce light in the time of 5 nanoseconds, while the reaction time of the incandescent light bulb is 200 milliseconds, so the auto industry has LED used in the brake lights. This article will focus on the LED characteristics and the drive LED of dispute, the case, the depth suitable for the led driver 120w  and dimming, switching power supply topologies, and details related advantages.

The stability of LED drive current to maintain a fixed brightness

The LED driver is still facing many challenges, to maintain a fixed brightness, to stabilize the current drive LED, and not by the input voltage, compared to incandescent bulbs simply connected to the battery as a power challenge.

The LED Floodlight 80W   has a forward VI characteristics, similar diode circumstances. White LED turn-on threshold of about 3.5 volts, under this threshold, the amount of current through the LED is very small. Exceed this threshold, the current will be enhanced exponentially, resulting in the increment of forward voltage, the LED and thus become the series resistance of the voltage source model. Should be noted, however, this model is valid only in the case of a single operation of the DC current DC current in the LED change, the resistance in the model should be changed to show the new operating current. Forward current, the electricity consumption in the LED will increase the device temperature, changing the forward voltage drop and dynamic impedance, determine the LED impedance, be sure to consider the heat of the environment.

If the LED Flood light 10W   is a buck regulator drive, in addition to DC current, the LED will often conduction inductor AC ripple current situation according to the selected output filter arrangement. This will increase the RMS intensity of the LED current will increase its power consumption and junction temperature have a significant impact on the life of the LED. If the 70% limit established in the light output as the useful life of the LED can increase LED life of 15,000 hours from 74 ° C, 63 ° C was extended to 40,000 hours. LED Power Supply loss to determine the method, the square of the RMS current in the resistance multiplied by the LED, plus along the forward voltage drop multiplied by the average current value. As the junction temperature is determined by the average power, even if there is a lot of ripple current, power consumption is also very small. For example, in which the buck regulator is equal to the DC output current peak ripple current (Ipk-pk = Iout), the total power loss will increase by less than 10%. If the extent is larger than this, quite a few cases, you must reduce the exchange of supply chain wave current to maintain the junction temperature and operating life. A practical basic principles, this is reduced by 10 ° C junction temperature, the life of the semiconductor will increase twice. In fact most of the design, because the relationship between the inductance limit, tend to use many of the low on the chain-wave current. In addition, the peak current in the LED should not exceed the maximum safe operating rated value specified by the manufacturer.

The LED Spotlight 30W   used in a variety of areas need a variety of power supply topologies to support

Information is available in Table 1 to choose the best switching topology LED driver reference. In addition to these topologies, using a simple current limiting resistor or linear regulator, but these methods usually consume too much power. The input voltage range, the number of driven LEDs, LED current, isolation, electromagnetic interference (EMI) constraints and performance are related to the design parameters. Most of the LED driver circuit can be divided into the following topological category: buck, boost, buck-boost, SEPIC, and flyback.

  • Sign in to reply
  • Former Member
    Former Member over 11 years ago in reply to Former Member

    Hi Steve,

    I was just reading thru the Element14's listings on lighting...Saw this article and your response..Could you give a few fyi's on why you believe it to be "rubish". Are you by chance a lighting expert that would like to be involved in Lighting topics or discussions on Element 14?

    • Cancel
    • Vote Up 0 Vote Down
    • Sign in to reply
    • More
    • Cancel
  • Former Member
    Former Member over 11 years ago

    This is just rubbish!

    • Cancel
    • Vote Up 0 Vote Down
    • Sign in to reply
    • More
    • Cancel
element14 Community

element14 is the first online community specifically for engineers. Connect with your peers and get expert answers to your questions.

  • Members
  • Learn
  • Technologies
  • Challenges & Projects
  • Products
  • Store
  • About Us
  • Feedback & Support
  • FAQs
  • Terms of Use
  • Privacy Policy
  • Legal and Copyright Notices
  • Sitemap
  • Cookies

An Avnet Company © 2025 Premier Farnell Limited. All Rights Reserved.

Premier Farnell Ltd, registered in England and Wales (no 00876412), registered office: Farnell House, Forge Lane, Leeds LS12 2NE.

ICP 备案号 10220084.

Follow element14

  • X
  • Facebook
  • linkedin
  • YouTube