Filed under Application Solutions, Medical/Scientific
Often providing immediate improvements in vision, laser eye care is becoming increasingly popular. One particular manufacturer of eye care laser equipment has already selected the TDK-Lambda EFE400M digitally-controlled medical power supply. The company’s strong working relationship with TDK-Lambda’s technical team combined with the EFE400M’s high efficiency and 5-year warranty proved a winning combination.
May16
Filed under Power Supplies Basics
Following the huge success of the PSU Glossary iPhone App, TDK-Lambda UK launches the Android version.
Very similar to the iPhone App, which is available from iTunes directly at TDK-Lambda PSU Glossary, the Android version makes the TDK-Lambda PSU Glossary available on many more devices.
The TDK-Lambda PSU Glossary Android App is available to download at: http://goo.gl/3eNpl
A useful tool whether at college, university or in business, the TDK-Lambda PSU Glossary App will be updated continually with new terms and calculations.
Apr26
Filed under Application Solutions, Test & Measurement
Ideal instruments for metal analysis, optical emission spectrometers are used for all metal industry process stages, from metal production through processing and recycling. A manufacturer of these instruments selected the HWS series of high-quality industrial power supplies that comes with a lifetime warranty as standard. During the design stage, the manufacturer benefited by the technical support received from TDK-Lambda field engineers.
www.uk.tdk-lambda.com/hws
Apr20
Filed under Power Supplies Basics
By Martin Southam, Director of Marketing, TDK-Lambda EMEA
One subject that our Technical Support team gets asked about frequently is minimum loads on multiple output power supplies, so I thought this would be a good subject to write about.
On a low cost, low power, multiple output power supply, the datasheet will often state that to maintain regulation, a minimum load has to be applied to one or more of the outputs.
To explain why, here is a block diagram of one such simple triple output power supply.
Fig. 1: Block diagram of a triple output power supply
As you can see, on the middle right hand side of the diagram are the three output windings from the transformer.
On Channel 1 (+5V), the output from the transformer is rectified and filtered to provide a smooth, DC output. If that output voltage is not at the set voltage, say due to a load change, the power supply will automatically correct itself. It does this by sensing the output voltage, comparing it to an internal reference, and feeding back a signal to the control circuit via the optocoupler. The control circuit will then adjust the pulse width of the converter accordingly. The regulation on this output is typically 1 to 2%.
On Channels 2 & 3 (+V and –V) though, it can be seen that there is no feed back to the control circuit – these outputs are referred to as being semi-regulated. If Channel 2’s load were to increase for example, the output would drop slightly, but there would not be any automatic correction. That voltage drop is specified by the load regulation specification, typically 3 to 5%.
With respect to minimum loading, if there is little or no load on Channel 1, the output will still be at the set voltage, but the switching converter pulse width will be very narrow. The output voltage on Channels 2 & 3 drops fairly dramatically at these narrow pulse widths, particularly if the outputs are supplying their full rated load. An output voltage of 12V, for instance, may drop to 8V. Conversely, if the full rated load is applied to Channel 1, but Channels 2 & 3 are not loaded, the voltages on 2 & 3 will rise, and a 12V output could deliver over 14V.
The effect that varying loads on Channel 1 has on the semi-regulated Channels 2 & 3, is many times referred to as the cross regulation specification.
Manufacturers of power supplies specify a minimum load requirement on Channel 1, usually 10%, to warn the user. Minimum loads may also be specified on Channels 2 & 3 to promote a better regulation specification.
Operating without a minimum load will not normally cause a power supply to fail, but can stress the user’s equipment.
Some power supplies, such as the TDK-Lambda MTW series, employ two converters to improve power supply regulation – one to supply Channel 1 and another to supply Channels 2 & 3.
Note: Both V2 and V3 are sensed by the control circuit.
Fig. 2: TDK-Lambda MTW series power supply features two converters
Other products, such as the TDK-Lambda NV175 series employ post regulators on each output, completely eliminating the minimum load requirement. Although this does add cost to the power supply, it removes any concern for the user and helps with system flexibility.
Apr18
Filed under Application Solutions, Renewable Energy
A manufacturer of frequency converters for wind power installations has selected Alpha modular power supplies from TDK-Lambda. These modular power supplies have a hold up time >150ms in the customer’s application and operate reliably under difficult conditions – enabling the frequency converters to supply the active and reactive power even during strong grid fluctuations. The frequency converter manufacturer recognised the value of local technical support offered by TDK-Lambda.
www.uk.tdk-lambda.com/alpha
Apr13
Filed under News
For the modern design engineer, searching through countless catalogues and trawling the internet for suitable power supplies is now a thing of the past. The TDK-Lambda Parametric Search Wizard offers a fast and easy method for selecting a power supply – whether it’s via your desktop, laptop, notepad or tablet web browser or smartphone, including iPhone* and BlackBerry†.
Over 3000 different 1.5W to 100kW AC-DC power supplies and DC-DC converters are available through the TDK-Lambda Parametric Search Wizard, with new products being added as soon as they become available.
AC-DC Power Supplies
DC-DC Converters
A full list of models is available through the TDK-Lambda Parametric Search Wizard at www.uk.tdk-lambda.com/wizard.
(*) iPhone is a trademark of Apple Inc.
(†) BlackBerry is a trademark of Research In Motion Limited.
All registered trademarks and trademarks are the property of their respective owners.
Apr11
Filed under Application Solutions, Medical/Scientific
Providing 1500W of efficient and reliable power to an electron microscope is the HWS series from TDK-Lambda. The HWS single output power supply comes with a lifetime warranty – lowering cost of ownership for the equipment manufacturer.
www.uk.tdk-lambda.com/hws
Apr04
Filed under News
TDK-Lambda UK’s PSU Glossary iPhone application gives you quick and easy access to a glossary of information applicable to power supply technologies.
Whether you are a student, engineer or hobbyist, this app will have content to help you.
The App is available from iTunes directly at TDK-Lambda PSU Glossary, alternatively search in iTunes for ‘PSU Glossary’.
Key Features
A growing library of terms applicable to power supply technologies.
A useful selection of relevant calculators.
A useful tool whether at college, university or in business, the TDK-Lambda PSU Glossary App will be updated continually with new terms and calculations.
Apr03
Filed under Application Solutions, Factory Automation
As our homes become more automated, equipment manufacturers are looking for DIN Rail mounted power supplies that offer reliable power. The DSP and DPP power supplies from TDK-Lambda are compact and feature an easy and fast mounting solution for TS35/7.5 and TS35/15 DIN-Rails. The two-year warranty and local technical support offered by TDK-Lambda proved a winning combination for the manufacturer.
www.uk.tdk-lambda.com/dpp
www.uk.tdk-lambda.com/dsp
Mar29
Filed under News
TDK-Lambda has compiled a new Programmable Power Supplies brochure, which is available online at: TDK-Lambda Programmable Power Supplies Brochure 2012.
Providing the best solution for programmable power in many applications, TDK-Lambda programmable (Lab) DC power supplies offer comprehensive control and monitoring features that are intuitive and easy to use and not overly complex.
The bochure provides comprehensive product details and usage guidelines for the:
Mar20
TDK-Lambda designs and manufactures AC-DC Power Supplies & DC-DC Converters for Industrial, Medical, Telecom, Datacom and T&M applications globally. Learn more...
Phone:
+44 (0) 1271 856666 (Sales)
+44 (0) 1271 856600 (Head Office)
Address:
TDK-Lambda UK
Kingsley Avenue
Ilfracombe, Devon
EX34 8ES
Email:
powersolutions@uk.tdk-lambda.com
Corporate website:
www.uk.tdk-lambda.com
Further info:
Visit our contact page
Stay up to date. Subscribe via:
RSS, Twitter or YouTube or Facebook.
© 2012 TDK-Lambda. All Rights Reserved.
Home | RSS Feed | Back to Top
