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Is switching power supply and transformer the same thing?
Mar 13, 2018


        Is switching power supply and transformer the same thing?

Now that there are many electronic products, there are many electronic components that can achieve some of the functions, but there are some differences between them. Today Xiaobian has come to introduce the difference between the switching power supply and the transformer. What is the switching power supply? What is a transformer? And how are their principles? This article introduced the principle and function of the switching power supply, and mainly used in what kind of occasions, and focused on introducing some differences between the switching power supply and the transformer. For specific details, see the following analysis.

Simply put, a transformer is a circuit of electronic components, and a switching power supply is a multi-electronic component that can be realized by a corresponding power conversion circuit.

Different switching power supplies can convert various forms of power into another form of power, such as:

AC and DC can be completed with high/low voltage conversion, and AC with high/low frequency conversion can be completed. (Transformers can use transformers as circuit components inside)

If only a well-designed transformer is used as an electronic component, it can only achieve a fixed-frequency AC current high/low voltage conversion.


The working principle of the switching power supply is: first, the AC power is converted into DC, and then the frequency of the AC voltage is converted to a higher frequency through the high-frequency transformer. The switching power supply is a circuit that controls the high-speed path and end of the switching line. A DC power conversion transformer with a high frequency alternating current needs a set or a set of voltages. The transformer is converted by magnetic coupling voltage. Switching power supply in a certain area is not an alternative transformer, its output is without transformer, rectifier, filter, voltage regulator is pure. An ordinary transformer is a DC power supply for DC voltage conversion. The main differences are: lighter switching power supply, adapting to a wider voltage range, more efficient use of power, more environmentally friendly, but high cost, the corresponding point (sometimes not too high), most of the occasions can completely replace the use of transformers . .


The difference between the switching power supply and the transformer is that the switching power supply is stable within a certain range of the voltage is very low or high pressure precision control (such as input 110v-250, the output voltage can be stable in the positive and negative voltage needs to be 0.5V)! The output voltage of the transformer changes with the input voltage, that is, the input voltage increases, the output voltage also increases, the input voltage decreases, and the output voltage decreases. Since the switching power supply converts the DC voltage into DC, the higher the DC voltage is through the power switch, the higher the AC current, and the voltage conversion by the high frequency transformer not only improves the working efficiency and greatly reduces the volume, but also saves copper. And the loss of iron. Because the power switch tube is controlled by the power switch, the on-time of the switch tube is short and the output voltage can be kept at a low current. The load switch maintains the output voltage. Therefore, the output voltage of the switching power supply is stable and can be used as a choice for LED display screens and other high-precision instruments.

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