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Articles

Medical power supplies and capacitor choices
by Danielle Sklepik, BEAR Power Supplies
Power Systems Design - April 2014

Operating rooms and clinical settings are crowded with instruments that pack in more functions and features every year, such as surgical tools with lights, lasers and video microscopes. The pressure for them to be smaller, lighter and easy to move around continues to grow.  Since the AC-DC converter is often the largest component in an instrument, this pressure lands heavily on the power supply designer. The drive to minimize the size of the power supply conflicts with the imperative for reliability.  This leads to some interesting challenges in specification development, component selection and board layout.

View or download the PDF: Medical power supplies and capacitor choices (1.1Mb PDF)

 

Understand surge protection techniques for low-power outdoor electronics
By Stuart Wood, BEAR Power Supplies
ECN  - December 2012

The growing use of low-power electronics in outdoor settings means that designers who are accustomed to creating indoor systems may need to brush up on surge protection techniques appropriate for greater exposure to lightning-induced surges. This article explains protection techniques for "category C, low exposure" equipment installed outside of a building. These systems include video surveillance systems, outdoor LED lighting systems, pole-mounted RF repeaters, and sensors and monitors in clean energy, oil, gas and other industrial applications.

View or download the PDF: Understand surge protection techniques for low-power outdoor electronics (1.2Mb PDF)

 

 
Next-gen smart grid equipment challenges power supply designers
By Michael Allen, BEAR Power Supplies
Electronic Design  - August 2010

This next wave of smart grid equipment places new demands on the engineers who design it. Specifically, unlike in-home smart meters, much of this new equipment will operate outdoors and under harsh environmental conditions. One of the most unexpectedly complicated aspects of designing an electronic device for outdoor use is the power supply, usually an ac/dc converter, which regulates the input voltage and converts it to levels suitable for the system components. We discuss how to design for the key challenges: extreme high temperatures, extreme low temperatures, and repeated high transients (e.g. lightning strikes).

View or download the PDF: Next-gen smart grid equipment challenges power supply designers (150Kb PDF)

 

How to spec a reliable custom power supply: Five essential tips
By Michael Winslow, BEAR Power Supplies
Electronic Products  - September 2007

When reliable power matters such as in commercial, industrial and medical systems even the most careful designers fail to include some essential information in their power supply specification. Here are five tips for specifying a reliable custom power supply unit (PSU) with the right balance of performance and cost for your application.

View or download the PDF:  Five essential tips on how to spec a reliable custom power supply (237Kb PDF)

 

Designing power supplies for portable devices
By Michael Allen, BEAR Power Supplies
Medical Design  - June 2007

Medical professionals expect high performance and reliability from portable medical electronic systems. Meeting these requirements often means that you will have to design the unit's DC/DC converter yourself, or commission a custom design. Here are several key factors to keep in mind, based on BEAR's experience designing power supplies for portable medical devices and other portable systems. Read about designing power supplies for portable devices.

 

Hot tips on temperature specs
By Brandon Hallen, BEAR Power Supplies
Machine Design - January 2007

What do a vendor's temperature specs tell you about the expected lifetime of a power supply? Can you use the manufacturer's mean time between failures (MTBF) data to get an idea of how long the power supply will last? This article answers these questions and more, explaining how to examine the temperature rise and construction of a power converter to get a much truer picture of a power supply's quality and life expectancy. Read hot tips on temperature specs for power supplies.

 

 
Understanding power supplies and inrush current limiting
By Michael Allen, BEAR Power Supplies
Electronic Products - March 2006

This technical article describes the importance of inrush current limiting, and compares advantages of the techniques commonly used in commercial power supplies.

View or download the PDF: Understanding power supplies and inrush current limiting (164Kb PDF)

 

   
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