Coil winding, transformer and series-parallel power electronic device

Abstract

The invention provides a coil winding, a transformer and a series-parallel power electronic device, and the coil winding is characterized in that a coil insulating layer wraps the outer side of a coilunit, then the inner side of an electric field shielding layer is filled with a high-frequency insulating medium filling material, and then the outer side of the electric field shielding layer is filled with a low-frequency insulating medium filling material; a high-frequency insulating medium filling material and a low-frequency insulating medium filling material are used, wherein one is a filling material with a dielectric loss angle and / or a dielectric constant lower than a corresponding preset low threshold value, dielectric loss can be reduced, and local high-frequency dielectric loss aggravation caused by an electric field shielding layer is made up, the other one is a filling material with a dielectric loss angle and / or a dielectric constant higher than a corresponding preset highthreshold value, so that the heat conduction performance can be improved, the temperature rise can be reduced, and the heat dissipation can be ensured, so the two parameters with the coupling relationship can be optimized, and the low dielectric loss and the high heat conduction performance can be considered at the same time.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and more specifically relates to a coil winding, a transformer and a series-parallel power electronic device. Background technique [0002] Between the primary and secondary sides of the intermediate frequency transformer of the power electronic transformer, the voltage difference has both high voltage and high frequency components; in the structure of cascaded power electronic transformers, generally speaking, the high voltage is low frequency or even DC components, while the high frequency The composition is low pressure. Therefore, in order to achieve better insulation performance, solid insulation is generally used. [0003] In current applications, there are two types of high-voltage casting transformers. One is the traditional dry-type transformer. The primary and secondary coils are cast separately and then installed into insulating sleeves, insulating pads, and iron cores. The...

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Problems solved by technology

[0004] However, the insulating material in the existing overall pouring scheme has certain coupling in its dielectric strength, dielectric loss, thermal conductivity and other parameters. If the insulating material is required to achieve better performance in various aspects, then will be more difficult

In the intermediate frequency transformer, there are high frequency and high voltage at the same time, and the electric field shielding layer is added around the winding to solve the insulation defect, but this will increase the local high frequency dielectric loss.

If the selected insulating material has a low dielectric loss, it means that the thermal conductivity is low. If the selected insulating material has a good thermal conductivity, it may increase the dielectric loss. Therefore, the transformer cannot balance low dielectric loss and High thermal conductivity

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