Placing an SMPS TransformerĪn SMPS transformer can be placed in one or more locations in a regulator circuit. For high output power supply units, heat sinks are normally used with chassis-mounted fans to provide sufficient cooling. SMPS units with lower efficiency will heat up to higher temperatures when run at high voltage/current, thus they require some thermal management strategies to remove heat. SMPS transformer and core material manufacturers generally supply hysteresis curves with their components, which allows a designer to determine the limits on the input current. There is a danger that the transformer core will saturate during operation when the input current is very high, which leads to more severe hysteresis and heat dissipation in the core. Hysteresis will occur in the magnetic cores used in SMPS transformers as the input AC signal oscillates. As these power supplies are run at high voltage/current, they pass strong magnetic fields into the core of the SMPS transformer. The low efficiency of an isolated SMPS arises due to the SMPS transformer used in the package. A non-isolated SMPS can have efficiency above ~95%, while an isolated power supply typically has 70% to 90% efficiency. The disadvantage of an isolated power supply is its low efficiency and large size. The SMPS transformer in an isolated power supply provides a clear barrier that prevents dangerous high voltages from passing to the output, providing safety from electrical shock at the output.
What is an SMPS Transformer?Īn SMPS transformer is used in a switching power supply to provide galvanic isolation. If you’re designing a switching power supply, you’ll need to evaluate the behavior of all transformers (both for input rectification and in the power transformer section) produces the desired output voltage and that ripple is within your tolerances. The bulky power supplies used in desktop computers and precision power supplies all use an SMPS transformer for galvanic isolation at the input of the regulator. I normally work on my laptop, but I still have a desktop computer that I use for software projects. SMPS transformer for a computer power supply
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