Special transformer is the heart of switching control power supply
The special transformer is the heart of the switching control power supply. On the one hand, the switching power supply can transmit and store power through it, and complete the conversion of data input and signal output, a basic knowledge of voltage technology; on the other hand, the switching power supply also passes through it for information input and output. High-voltage isolation to enhance the safety that enterprise users need to use. Amorphous magnetic rings are magnetic components processed with amorphous materials. Amorphous magnetic rings can be divided into iron-based amorphous, cobalt Amorphous base, etc. In addition to the conversion of AC voltage, special transformers also have various other uses, such as changing the frequency of the power supply, the power supply of rectifier equipment, the power supply of electric welding equipment, the power supply of electric furnace or as voltage transformer, current transformer Etc. High-voltage DC power supply, also known as DC high-voltage power supply, is a power supply with input from AC mains or 3-phase electricity and output of DC voltage of more than thousands of volts or tens of thousands of volts. The output power is hundreds of watts to several kilowatts. The high voltage isolation of the switching power supply can be completed through some special transformers, and the insulation protection of the special transformers is essential.
Generally speaking, the insulation technology protection system of special transformers can be mainly divided into: turn distance, layer distance, (winding) group distance and winding and magnetic core isolation. We will discuss them separately below:
1) Turn distance, that is, the isolation between adjacent turns in a single winding of a special transformer. For example, the A winding is wound around 10 turns, and the isolation between the 6th turn and the 5th and 7th adjacent turns, that is, the turn distance. In most electric motors In the case of a flat car, the conventional turn distance can be achieved by using enameled wire, and the appropriate enameled wire can be selected by the V\/turn (voltage accepted by each turn) of the designed transformer. Of course, in actual use, enameled wire The insulating layer of the coil is easily damaged by high temperature, so in the design process, in addition to the above V\/turn, it should be further selected according to the winding loss and temperature rise.
2) Layer distance, that is, the special transformer is single and the windings are isolated between different winding layers. For example, winding B is wound in 3 layers, and the second layer is connected to the adjacent first and third layers. Isolation is the distance between layers.
1. The adjacent contact surfaces are isolated. If winding A continues winding B after winding is completed, insulation maintenance should be performed between the winding layer at the end of winding AN and the winding layer at the beginning of winding B.
2. The two end faces of windings a and b are generally on the same plane, which is not conducive to the isolation between the two windings. Therefore, during the winding process, in order to consciously dislocate the end faces of the two windings, the winding b can be retracted several times. mm to achieve this purpose. Of course, the indented area needs to be filled with the corresponding width of the insulating tape winding system to reach the subsequent winding level.
