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Design principles and design principles of high frequency transformers
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- Time of issue:2020-08-31
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Design principles and design principles of high frequency transformers
Design principle of high frequency transformer
When designing high-frequency transformers, 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 pulse square wave signal. In the transient process of transmission, leakage inductance and distributed capacitance will cause surge currents and peak voltages, as well as top oscillations, resulting in increased losses. Usually the leakage inductance of the transformer is controlled to be 1% to 3% of the primary inductance.
The leakage inductance of the primary coil-the leakage inductance of the transformer is caused by the incomplete coupling of the magnetic flux between the primary coil and the secondary coil, layer to layer, and turn to turn.
Distributed capacitance-the capacitance formed between the turns of the transformer winding, between the upper and lower layers of the same winding, between different windings, and between the winding and the shielding layer is called distributed capacitance.
Primary winding-the primary winding should be placed in the innermost layer, so that the wire length for each turn of the transformer primary winding can be the shortest, so that the entire winding wire is the least, which effectively reduces the distribution of the primary winding itself capacitance.
Secondary winding-After winding the primary winding, add (3 ~ 5) layers of insulating pads and then wind the secondary winding. In this way, the capacitance of the distributed capacitance between the primary winding and the secondary winding can be reduced, and the insulation strength between the primary and the secondary can be increased, which meets the requirements of insulation withstand voltage.
Bias winding----whether the bias winding is wound between the primary and the secondary or the outermost layer depends on whether the switching power supply is adjusted according to the secondary voltage or the primary voltage.
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