How is the primary and secondary windings of the high frequency transformer distributed?

2019-05-07 10:59:14 JUKE CHINA ODM OEM Transformer factory Read

How is the primary and secondary windings of the high frequency transformer distributed?

Everyone knows that the winding is a set of wires that constitute the electrical circuit corresponding to a certain voltage value marked by the high-frequency transformer. In the process of manufacturing, the winding is very important, the number of windings is different, and the high-frequency transformer The functional voltage is also different. How do the High frequency transformers make the primary and secondary windings distributed?

Primary winding

The primary winding should be placed in the innermost layer so that the primary winding of the high frequency transformer can be used for the shortest length of each wire, thus minimizing the total winding wire, which effectively reduces the distributed capacitance of the primary winding itself. Under normal circumstances, the primary winding of the transformer is designed as a winding of less than two layers, which minimizes the leakage inductance of the transformer.

The primary winding is placed in the innermost portion, shielding the primary winding from other windings, helping to reduce the mutual coupling of electromagnetic noise between the primary winding of the transformer and adjacent devices. The primary winding is placed in the innermost part, so that the starting end of the primary winding acts as the drain or collector drive terminal of the switching power supply power transistor, which reduces the coupling of the transformer primary to the electromagnetic disturbance of other parts of the switching power supply.
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2. Secondary winding

After the primary winding is wound, a (3 to 5) layer of insulating spacer is added to rewind the secondary winding. This reduces the capacitance of the distributed capacitance between the primary winding and the secondary winding, and also increases the dielectric strength between the primary and secondary, meeting the insulation withstand voltage requirements. Reducing the capacitance between the primary and secondary of the transformer helps to reduce common mode disturbances at the output of the switching power supply.

If the secondary of the high frequency transformer has multiple outputs and the outputs are not common, in order to reduce the leakage inductance, the secondary with the highest power is close to the primary winding of the transformer. If this secondary winding has only a relatively small number of turns, in order to improve the coupling situation, it should be managed to fill it with a complete layer. For example, multiple wires can be connected in parallel to help improve the filling factor of the secondary winding. . The other secondary windings are tightly wound around this secondary winding.

When the multi-channel output of the high-frequency transformer adopts the common ground technology, the processing method is simpler. The secondary can be outputted in the form of a transformer tap, and insulation isolation is not required between the secondary windings, so that the winding of the high-frequency transformer is more compact, the magnetic coupling of the transformer is strengthened, and the voltage regulation performance at light load can be improved.