If we´re deciding whether to use a classic transformer or better a modern electronic switch-mode power supply (SMPS), it´s good to realize pros and cons of both technologies.
This is an archive article published 05/21/2014. Some information may no longer be up to date and in line with the current state. Please contact us in case of interest.
Switch mode power supplies Myrra series 47000 already found their stable place on the market and they gradually replace classic transformers. Why is it so?
Switch-mode power supplies definitely win in a perhaps the most important requirement of these days - in efficiency (in a whole load range) and in a low no-load consumption (Standby). Similarly also many other factors say in favor of switch-mode power supplies, for example power/ weight ratio, size, simple elimination of a high inrush current, silent operation, minimum stray magnetic field, ...
From these reasons for the majority of applications it´s better and often even cheaper to use an “electronic replacement” of transformer - for example modules series Myrra 47xxx or AC/DC modules Traco Power for higher power ratings.
Maybe it´s worth to question, whether there´s still any reason to use a classic transformer in usual applications with power demands say 1-1000W? Surely yes, for example in application very sensitive to HF radiation (HF receivers, pre-amplifiers,…) but also in applications with a demand for the highest reliability for decades. Transformer is a component which almost doesn´t age and if properly sealed in a resin, then it´s lifetime is extremely long. As a transformer doesn´t contain any semiconductors, capacitors etc, it´s also very resistant to various spikes, overvoltages and noise in a power line...
Power supplies of 47000 series have a very low no-load power consumption - only 200 mW, resp. 300 mW at unregulated types. With the 4000VAC isolation (input/output), they´re ready for a class II – reinforced isolation. With a built-in protection against shortcut and over-temperature, they´re ready for usage in a virtually any device with power demands up to approx. 5-5,4W.
Price was valid on when ordering pcs. If you want to know the current price and availability, request a price offer.
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