IEC 62368-1, EN 62368-1 & UL 62368-1 Approved Power Supplies & DC-DC Converters

Posted on 03 déc. 2018

The New Safety Standard for ITE and AV Equipment

IEC/EN/UL 62368-1 is the new safety standard with a broad scope that covers ITE, communication technology, audio/video & similar type of equipment. It is a convergence of safety standards to replace IEC 60950 & IEC 60065 as the technologies also converge. The new standard adopts a hazard-based safety engineering (HBSE) approach/standard rather than applying specific safety requirements for specific product types.

HSBE adopts a 3 Block model which, identifies energy sources in the product, classifies the energy and potential to cause injury or damage, Identifies the required safeguards for protection from energy sources with the potential to cause injury or damage and qualifies the safeguards as effective.


IEC protection classes for power supplies

Posted on 05 nov. 2018

Power supplies fall into one of three protection classes based on the need, or not, for a protective earth connection:

Class I   - where user protection from electric shock is achieved through a combination of insulation and a protective ground. Class II  - where user protection from electric shock is achieved through two levels of insulation (either double or reinforced). Class III - where the input is connected to a safety extra low voltage (SELV) circuit meaning no further protection is required.

Electrolytic Capacitor Lifetime in Power Supplies

Posted on 08 oct. 2018

Electrolytic capacitors are an essential ingredient in AC-DC power supplies, providing high Capacitance x Voltage (CV) and low Equivalent Series Resistance (ESR) in low-volume packages that simply cannot be achieved cost-effectively using alternative parts. The service life of these electrolytic capacitors is an increasingly key design parameter in power supplies. 


Tiny 500W PSU meets latest medical and IT standards

Posted on 31 juil. 2018

The new GCU500 series of 500W AC-DC power supplies, with class-leading features, measure just 83.8 x 165.1 x 39.3mm (3.3 x 6.5 x 1.55”), conveniently fitting into 1U systems, if required.


These rugged products are ideal for high reliability, cost-sensitive industrial applications. Dual fusing, low leakage current and input/output isolation of 2 x MOPPs (Means Of Patient Protection) makes the series ideal for use in critical healthcare applications such as ventilators and medical carts in hospital environments. The products meet the latest ‘third edition’ of medical standard IEC 60601-1 including risk management and is rated for safety at high altitudes – 4000m for medical and 5000m for IT.


Surge Testing - An Overview

Posted on 05 juin 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 mai 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 avr. 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 mars 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 févr. 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 déc. 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.
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