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High frequency transformer specification model selection guide
Mar 11, 2018


     High frequency transformer specification model selection guide

There is no official standard value for the high-frequency transformer specification model. The high-frequency transformer is a non-standard component, so we can't refer to the specification and model when we use it. The transformer of the switching power supply is to have its own design parameters. We can only design by ourselves. In the article, we introduced the parameter comparison table for each part of the common high-frequency transformers. We will not elaborate here, but the skeleton is universal. If you require a small output power, you can find the skeleton of the commonly used EE1x column, the following article to introduce how we should be based on their own parameters to design the selection of various parameters, the detailed situation, see the following analysis.

First of all, according to the operating frequency, circuit topology and output power using the formula or experience to select the appropriate transformer size specifications, and sometimes also consider the working environment (such as temperature, use occasions, whether sealed, etc.), you said that is generally a flyback circuit, About 60KHz frequency, use EE25 or EE28 on it. Then, calculate the number of primary turns, the number of primary turns and the operating frequency, magnetic circuit core length, core cross-sectional area, and input voltage. Each topology has a more complicated formula; more experienced designers will directly give The number of defects. Determine the wire diameter


Finally, the secondary and bias turns and the wire diameter are calculated based on the primary turns, the input/output voltage, and the duty cycle. The next step is to debug and adjust. There are many kinds of transformer parameters that can work normally, but there is only one best state. The calculation is to let it work first, and the adjustment is to find the best state. High-frequency transformer is the main component of the switching power supply. The ratio of the turns of each winding of the high-frequency transformer determines the output voltage.


High-frequency transformers are the main components of switching power supplies. There are many topologies in switching power supplies. For example, in a half-bridge power conversion circuit, the two-three-pole switch is turned on to generate a 100 kHz high-frequency pulse wave and the high-frequency transformer is a transformer, and the output current and the turns ratio of each coil of the high-frequency transformer determine the output voltage. The typical half-bridge converter circuit is the most prominent three high-frequency transformers: main transformers, drive transformers and auxiliary transformers (standby transformers), each of which has its own measure in the national transformer, such as the main transformer, as long as it is more than 200W power The core diameter (height) will not be less than 35. Auxiliary transformers, whose core diameter reaches 16mm when the power supply does not exceed 300W

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