Surge Testing - An Overview

Posted on 09 5月 2018

One of the core immunity tests that electrical & electronic equipment is subjected to is input surge testing. The test method for this is IEC61000-4-5 and the limits are defined by end system requirements.

The basics of the test are to subject the system to voltage spikes on top of the nominal voltage input to the system. These spikes are representative of voltage fluctuations that occur from causes such as large motor drives, nearby lightning strikes, etc. These high voltage deviations can cause a variety of issues when applied to a system not designed to handle them. Testing ensures that the end equipment will give the level of performance needed for the intended application.


Overcoming Patient Leakage Current Issues

Posted on 03 5月 2018
IEC 60601 is the generally accepted standard for medical electrical and electronic equipment, required for the commercialization of this type of equipment in many countries. To guard against electric shock, the specification defines maximum leakage currents for equipment with an applied part, that is, a part of the equipment that comes into contact with the patient under normal operating conditions.

Modular and Configurable Solutions for Vetronics Applications meet MIL-STD-461G

Posted on 12 4月 2018

Modular and Configurable Solutions for Vetronics Applications meet MIL-STD-461G

This blog discusses XP Power's modular and configurable solutions for compliance with MIL-STD-461 for Vetronics applications and how this relates to the Ground Army requirements within that standard.

The US Department of Defense Standard MIL-STD-461 is an EMI standard for the control of emissions and susceptibility characteristics of electronic equipment. The current revision of the standard MIL-STD-461G superseded MIL-STD-461F on 11th December 2015.

AC Input Current & Harmonics

Posted on 29 3月 2018
As a result of the peak rectification techniques used in power supplies, harmonic currents are generated. To limit these harmonics, legislation has been introduced. The relevant standard is EN61000-3-2 for equipment with an input current ≤16 A per phase.

Power Systems for Patient Connected Equipment

Posted on 15 2月 2018
This blog discusses two approaches for power systems within medical equipment for patient connected applications. The part of the equipment which comes into contact with the patient is known as the applied part. The applied part is defined as the part of a medical device which, in order for the medical device to perform its function, deliberately comes into direct contact with a patient. This also applies to parts which are likely to come into contact with the patient.

Power supply applications with output voltages exceeding 60VDC

Posted on 18 12月 2017
Most commercially available power supplies have output voltages ranging from 3V3 to 54VDC.  However, there are many end applications for power supplies where a higher output voltage is required. Given the lack of availability of standard higher output voltage supplies, it is not unusual for the required system voltage to be generated from multiple standard units in series or by connecting the outputs of a multiple output supply in series.

Low profile full brick baseplate cooled AC-DC power supplies require no external components

Posted on 23 11月 2017
XP Power’s ASB110 series provides a complete baseplate-cooled AC-DC power supply module that requires no external components in an industry standard full brick, low profile package. Aimed at ITE and industrial customers looking for a baseplate-cooled power supply solution, the ASB110 provides 110W of DC output power from a universal (85 – 264VAC) AC input. 

Reliability Terminology

Posted on 24 10月 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月 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月 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

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