Path: EDN Asia >> Design Centre >> Power/Smart Energy >> Avoid being ripped off when buying power supplies
Power/Smart Energy Share print

Avoid being ripped off when buying power supplies

01 Apr 2013  | David Norton

Share this page with your friends

Time and again, we hear or read about cases where counterfeit and/or fake power supplies are sold to those who are enticed by ultra low prices, but end up with big headaches instead.

Because there are bad guys out there who are dishonest, we come back to the question of 'how to avoid being ripped off when buying power supplies.' The answer is simple. Buy from reputable and well established companies who have been providing power supplies for at least ten (10) years. Avoid buying 'seemingly' bargain priced power supplies from eBay or other online discount websites. Fake chargers can kill your expensive cameras, smart phones and other devices.

If you work for an electronics manufacturer, remember that the switchmode power supply is the heart of your end-product or system and your company requires power supplies that will provide excellent performance and trouble free operation for many years. The last thing an OEM needs is a lawsuit or the need to recall thousands of products from the field.

If in doubt, ask the power supply vendor for the UL listed file number for the supply you are interested in using. For UL Listed and UL Recognized products, the file number is usually printed near the UL mark and typically begins with an E prefix followed by a 6 character number, e.g., E133400. If the file number is not shown, most reputable power supply vendors/manufacturers will provide the end-user with this information. Anyone can go to the UL website to check on a UL file number to make sure the supply is actually listed (approved) and to confirm the name of the manufacturer.

At this website you can enter the 'UL File Number' in the box provided (e.g., E133400) and then click the SEARCH button. If the power supply is in the UL database, information about the manufacturer will be shown. If you then click one of the items shown, the associated model number(s) that conform to the specific UL safety specification(s) will be listed.

By following the above recommendations, you'll become a wise power supply consumer and thereby avoid costly mistakes in your next power supply selection and purchase.

About the author
David Norton fromTDK-Lambda contributed this article.

To download the PDF version of this article, click here.

Want to more of this to be delivered to you for FREE?

Subscribe to EDN Asia alerts and receive the latest design ideas and product news in your inbox.

Got to make sure you're not a robot. Please enter the code displayed on the right.

Time to activate your subscription - it's easy!

We have sent an activate request to your registerd e-email. Simply click on the link to activate your subscription.

We're doing this to protect your privacy and ensure you successfully receive your e-mail alerts.

Add New Comment
Visitor (To avoid code verification, simply login or register with us. It is fast and free!)
*Verify code:
Tech Impact

Regional Roundup
Control this smart glass with the blink of an eye
K-Glass 2 detects users' eye movements to point the cursor to recognise computer icons or objects in the Internet, and uses winks for commands. The researchers call this interface the "i-Mouse."

GlobalFoundries extends grants to Singapore students
ARM, Tencent Games team up to improve mobile gaming

News | Products | Design Features | Regional Roundup | Tech Impact