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Explanation of the design principle of high frequency transformer
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High frequency transformer
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Release time:
2022-08-26
High frequency transformer is the most important part of switching power supply. There are many topologies in switching power supplies. For example, a half-bridge power conversion circuit, when working, two switching transistors are turned on in turn to generate a high-frequency pulse wave of 100 kHz, and then the high frequency transformer is used to transform the voltage to output alternating current. The ratio of the turns of each winding coil of the high frequency transformer is determined by the output voltage.
The most conspicuous in the typical half-bridge transformer circuit are the three High frequency transformers: the main transformer, the drive transformer and the auxiliary transformer (standby transformer). Each transformer has its own measurement standards in national regulations, such as the main transformer, As long as it is a power supply of more than 200W, the core diameter (height) must not be less than 35mm. As for the auxiliary transformer, when the power supply does not exceed 300W, its core diameter is 16mm.
When designing a high frequency transformer, the leakage inductance and distributed capacitance of the transformer must be minimized, because the high frequency transformer in the switching power supply transmits a high frequency pulsed square wave signal. During transmission transients, leakage inductance and distributed capacitance cause inrush current and voltage spikes, as well as top ringing, resulting in increased losses. Usually the leakage inductance of the transformer is controlled to be 1% to 3% of the primary inductance.
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