Experimental measuring method for stray capacitance of transformer

Abstract

The invention discloses an experimental measuring method for stray capacitance of a transformer. The experimental measuring method comprises the steps of: making all distributed capacitors equivalentto a parasitic capacitor Cw connected to two ends of a primary winding of the transformer according to a transformer stray capacitance equivalent model; constructing a circuit for measuring stray capacitance of the transformer, wherein the circuit comprises an inverter half bridge, a resonance network and a rectification and filtering circuit which are sequentially connected; acquiring a current of an excitation inductor, driving a voltage of a switching tube Q2, drain-source voltages of the switching tube Q2 and waveforms of the output voltages, and reading a dead time, a dead time period excitation current value and a dead time period output voltage value of the waveforms; integrating output capacitance from 0 to an input voltage according to a C-V curve of the output capacitance of theswitching tube; and calculating a value of the stray capacitance of the transformer by adopting a charge conservation formula, thereby completing experimental measurement of the stray capacitance ofthe transformer. The experimental measuring method solves the problems of complicated calculation, large error and small application range of the traditional method, and can be used for measuring various types of transformers.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to an experimental measurement method for the parasitic capacitance of a transformer. Background technique [0002] Currently, power converters are developing towards high switching frequency, high efficiency and high power density. High power density converters are widely used in consumer electronics, automotive industry, communication industry, aerospace and military industries and other fields. In order to design and manufacture high power density converters, the optimization of transformer volume is very important. Planar transformers have the advantages of low height, small size, small leakage inductance, good consistency and heat dissipation, and gradually replace traditional transformers in high-frequency applications. There are many types of planar transformers, among which planar transformers using PCB windings are widely used due to their low cost, stable struc...

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Problems solved by technology

[0004] In order to solve the above-mentioned defects existing in the prior art, the object of the present invention is to provide a method for measuring the parasitic capacitance of the transformer through experiments, collect the voltage and current signals in the experimental circuit, and then obtain the voltage and current of the transformer through simple calculations. Parasitic capacitance, which solves the problems of complex calculation, large error and small application range of traditional methods, and can be used to measure various types of transformers

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