A Method of Selecting Magnetic Core Based on Structural Dimensions

Abstract

A method for selecting a magnetic core according to structural dimensions is provided. By taking the winding loss as the design parameter, , the expression of the structural dimension Kg of a magneticcore is progressively deducted, wherein Rho is resistivity, and at the temperature of 20 DEG C, copper is 1.724*10<-6> (omega / cm<2>), P0 is the output power of transformer (W), delta is the duty cycle of circuit topology, PCU is the total copper wire loss of transformer (W), eta is the transformer efficiency, Bm is the magnetic induction intensity (T) when transformer works, and f is the operating frequency (Hz). The method is applicable to switching power supply transformers with various topologies, and then corresponding to the inherent structure size coefficient Kg of the magnetic core, and the magnetic core of corresponding specification can be selected. The method avoids the extensive transformer design based on experience and makes the calculation more precise.

Description

technical field [0001] The invention relates to the technical field of transformers, in particular to a method for selecting magnetic cores based on structural dimensions. Background technique [0002] A transformer (Transformer) is a device that uses the principle of electromagnetic induction to change the AC voltage. When a transformer engineer makes a preliminary design of a product, the first thing that is often considered is to select the corresponding magnetic core according to the circuit topology and load capacity. Usually , most of them rely on experience or use the existing power table to select the corresponding magnetic core, and these are often limited. When the capacity or required parameters exceed the respective experience and power table, it is not easy to select a relatively appropriate core. The core is gone. [0003] Therefore, it is necessary to do further research on the method of selecting the magnetic core. Contents of the invention [0004] The p...

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Problems solved by technology

[0002] A transformer (Transformer) is a device that uses the principle of electromagnetic induction to change the AC voltage. When a transformer engineer makes a preliminary design of a product, the first thing that is often considered is to select the corresponding magnetic core according to the circuit topology and load capacity. Usually , most of them rely on experience or use the existing power table to select the corresponding magnetic core, and these are often limited. When the capacity or required parameters exceed the respective experience and power table, it is not easy to select a relatively appropriate core. core out

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