Appliance Design - November 2007 - (Page 22)

DISPLAYS & INDICATORS Kingbright 0.4 mm Ultra-Thin 0805 Blue SMD LED’s features a built-in Zener diode that can withstand ESD voltage up to 5,000 V. 2250 SERIES WOB-L® Brushless DC Piston Pumps and Compressors • • The HSMR-CL25 LED from Avago Technologies is indium gallium nitride blue and is ultra thin. Oil-less design Available with barbed or threaded ports PTFE Piston Ring Aluminum die cast components 24V DC Vacuum to 22.0" Hg Flow to 1.21 CFM • • • • • voltage, reverse voltage and electrostatic discharge. Oliveros says that LED drivers allow for a constant current so the current does not fluctuate or adjust as the LED heats up. In terms of ESD protection, some companies have added specialized diodes. Kingbright, for example, added a Zener diode to protect its new blue product. The diode permits current to flow in the forward direction like a traditional diode, but also in the reverse direction if the voltage is too large for the LED to handle. According to Yu, the Zener diode will help protect against the LED from ESD of up to 5,000 volts. Heat can be another important issue because as the temperature rises, brightness falls. If the LEDs are driven harder, used in a multi-array scenario, or placed too close to a hot operating environment, failure — meaning a 50 percent or more drop in luminous intensity — could occur. But, many suppliers say that while heat still must be considered, it is less of a challenge. In the past, as temperature neared 55 DegC, the light output would decrease. Today, says Kingbright’s Chu, many LEDs operate all the way to 85 DegC. Some of Kingbright’s specialty products can top 100 DegC. LEDs on cell phones and appliances generally do not have to worry about heat issues, says Saffa, because the LEDs themselves generate little heat. It is often other areas of the design that can be troublesome. Saffa suggests that using proper circuit board design is a way to minimize most heat-related problems. Other ways to protect the LED from heat include using heat sinks or changing the substrate. Lumex, for instance, offers both types of products. Some LEDs For more information on the 2250 Series, or our complete line of WOB-L® pumps and compressors, visit thomaspumps.com/2250ad Lumex Koolbright LED product uses a ceramic substrate that helps protects the LED from the heat. For more Information Enter 110 22 applianceDESIGN AD03074Thom.indd 1 November 2007 1/31/07 9:11:29 AM www.applianceDESIGN.com http://www.thomaspumps.com/2250ad http://www.thomaspumps.com/2250ad http://www.appliancedesign.com

Table of Contents Feed for the Digital Edition of Appliance Design - November 2007

Appliance Design - November 2007 Contents Editorial Shipments/Forecasts News Watch Today’s LEDs are Brighter and More Colorful than Previous Versions, Allowing Designers More Opportunities to Improve and Differentiate Their Products. When Converting from CCFL to LED Backlights in LCD Panels, New Driving Methods are Needed. Electrowetting Technology Allows Displays to be Designed in an Extensive Range of Colors. Noise Problems are Not Always Easy to Find or Fix, but Acoustic Labs Can Help Designers Ferret Out the “Good” Noise from the “Bad.” A New Sanitization Protocol for Clothes Washers Combines the Best of Three Well-Established Provisions to Ensure Efficiency, Quality and Safety. Stricter EMC Requirements Raise the Bar for Appliances with Electronic Controls and Require Testing to New Levels. Despite Added Cost and Complexity, Gas-Modulating Systems have Migrated from Large-Scale Boiler Applications to Smaller Residential and Commercial Furnaces and Appliances. A New Treatment Technology Hardens the Surface of Light Alloys such as Aluminum and Magnesium and Expands Their Potential Applications. DesignMart Advertiser’s Index Association Report: AHAM

Appliance Design - November 2007

For optimal viewing of this digital publication, please enable JavaScript and then refresh the page. If you would like to try to load the digital publication without using Flash Player detection, please click here.