Reliability Terminology

Posted on 24 10 2017
Failure rate is defined as the percentage of units failing per unit time. This varies throughout the
life of the equipment and if λ is plotted against time, a characteristic bathtub curve is
obtained for most electronic equipment.

Energy efficiency for external power supplies (EPS)

Posted on 03 10 2017
Controlling the power consumed by external power supplies, whether when they are supplying power or when disconnected from the load, is important for continuity of the energy supply and reduction of environmental impacts. Legislation and targets are set for external power supplies because of proliferation, lack of on/off control and because they are commonly left plugged into the mains supply when not in use.

MIL-STD-1275 Compliance for power systems made easy.

Posted on 07 9 2017

The US Department of Defense Standard MIL-STD 1275 is an immunity standard that defines a series of test conditions to be applied to the input of a 28V electrical power system within a military vehicle.  These include spikes, surges, operating voltages and ripple


Miniature PCB Mount 5 W AC-DC power supply meets international medical safety standards

Posted on 26 7 2017
The EME05 series of ultra-compact, single output, 5 Watt AC-DC power supplies are believed to be one of the smallest 5 Watt AC-DC supplies, with full international medical safety approvals, on the market. It is available, as standard, in either an encapsulated or open frame mechanical format and measures just 35.6 x 23.7 x 17.6 mm in its open frame format, requiring the minimum of space in the end application.

Supplying an AC/DC Power Supply from a DC source

Posted on 11 7 2017
A frequently asked question concerns the suitability of using an AC/DC power supply with a DC source. There are two parts to the answer, one concerning the ability of the converter to run without issue and the other concerning the safety aspects.

DEF-STD 59-411 and the challenge of Land Class A

Posted on 15 6 2017
DEF STD 59-411 was issued by the UK Ministry of Defence in 2007 for land, sea and air equipment.  It replaced DEF STD 59-41 and other EMC related Defence Standards. DEF-STD 59-411 is organised into 5 sections and the tables below show how it differs from the previous standard

New Version of EN61000-3-2, The Harmonic Current Standard

Posted on 05 6 2017
EN61000-3-2:2006+A2:2009 is the present standard for limits for harmonic current emissions for equipment with an input current less than, or equal to 16A per phase but will be withdrawn and replaced by EN61000-3-2:2014 on 30th June, 2017.

Designing for reliability in high voltage applications

Posted on 28 5 2017
High voltage design and manufacturing comes with an additional set of disciplines that must be applied in order to produce products with excellent long term reliability, often in harsh environments. As high voltage power supplies become increasingly compact and miniaturized, mastering these disciplines is essential to ensure long term and trouble-free operation in the field. Failure to properly apply these design and manufacturing principles can result in real-world MTBF well below design expectations. In school, we were taught that materials were either conductors or insulators. Air was said to be an insulator. However, lightning proves that air is not always an insulator. Welcome to the world of high voltage!

Industry leading 95% efficient 225 Watt AC-DC supply in a 2" x 4" package

Posted on 11 5 2017
The EPL225 series of high efficiency, open frame, AC-DC power supplies are approved for industrial, IT and medical applications. The series comprises seven single-output models that offer a range of standard output voltages from +12 VDC to +48 VDC. A secondary 12 VDC / 0.5 A fan output is provided across the range.

The New Safety Standard for ITE and AV Equipment: IEC62368-1

Posted on 10 4 2017

Background of IEC62368-1

The boundaries between information technology and audio/ video technology have become increasingly blurred. For example, “when is a 15” TFT device a TV and when is it a PC monitor?” or “is a smartphone a telephone, a PC or is it a MP3 player”.   Application of safety standards such as IEC 60065 and IEC 60950-1 has led to certain devices being tested twice and sometimes there are conflicting requirements between the two product standards.  There is therefore a need for a single safety standard to replace the two existing IEC 60065 (Audio and Video) and IEC 60950-1 (Information and Communication Technology) product safety standards.

0 1096 -1 Blog