This test can be performed on any smps transformer with or without air gaps. Fundamentals of switchmode power supply testing tektronix. The procedure of the transformer ratio test is simple. If you would like to test the output of the smps then place your probe after the secondary diode output pin and check the dc voltage.
With the right oscilloscope and the tips outlined in this poster, learn how to better ensure the reliability, stability, compliance, and safety of your switchmode power supply smps design. Leakage current, required for smps transformers used in. This test also performed as a routine test of transformer. It is equivalent to the procedure used for performing a shortcircuit impedance test on an autotransformer. So for ensuring proper performance of electrical power transformer, voltage and turn ratio test of transformer one of the important tests. Testing of power transformers seems like a similar experience. Switch mode transformer application notes west coast magnetics. Testing smps transformer without load electronics repair. It is regarded as a rating associated with an output that can be taken from the transformer conditions and limitations of established standards. How to design smps to pass common mode lightning surge test. Testing smps transformer without load electronics repair and. Smps transformers are commonly used in a regulated power supply and function to step up or step down voltage or current, andor provide isolation between the input and output side of. Switch mode power supply smps transformers are commonly used in a regulated.
There is not much info about testing smps transformers so i gave it a try and show you some tests. In this book we have laid down important aspects on transformer. Inductors and transformers serve key roles in switchmode power supplies. Performing incircuit inductor and transformer measurements in. Pdf augmented models of highfrequency transformers for smps.
It evolved from the simple gonogo verdict into a sophisticated segment within transformer manufacturing. Magnetics design 4 power transformer design texas instruments. Our newly developed transformers and chokes feature a new core shape using a new core material that is designed for different c ore usages based on the advantages of each materials characteristics. Hi sir, how can i test smps transformer without voltage checking. Switch mode power supplies smpss are used in a range of applications as an efficient and effective source of power. Transformer testing has developed considerably over the past years. This article covers a wide range of transformer theory and voltechs testing capability. How to test a switch mode power supply transformer. So transformer ratio test is an essential type test of transformer. For anybody still working on a desktop, look for the fan output in the central processing units cpu.
On my website you find more about measurements on transformers. In switchedmode power supplies smps, magnetic components, namely inductors and transformers, play critical roles. It is a common sense that if you get the right output voltage then thats mean the smps transformer is producing good ac voltage thus it is not necessary to check all the output pin of the smps transformer. Pdf the modeling of highfrequency transformers via augmented. Our lineup of transformers small, thin, or inexpensive al lows us to provide the best transformer for your needs. This test checks the resistance of the nonsafety insulation between the screens and windings of the transformer. Transformers for switching power supplies tdk corporation. Transformer testing type tests and routine tests of. Here we will look at the 750811290, a transformer designed for flyback smps configurations. Aneval ice3ar1080vjz 34 w 12 v smps evaluation board with. Read our switch mode power supply testing guide to get best test coverage for your smps txs. Smps acdc reference design users guide ds70320bpage iv 2008 microchip technology inc. If i repeat the procedure of measuring the voltage across diode i was able.