Measuring method for stray capacitance of large-capacity high-frequency transformer

Abstract

The invention provides a measuring method for the stray capacitance of a large-capacity high-frequency transformer. The method includes the steps that 1, a frequency-variable excitation signal is exerted on the high-frequency transformer through a signal generator, and an oscilloscope collects a voltage signal and a current signal of a primary-side winding of the high-frequency transformer; 2, the natural resonant frequency of the high-frequency transformer is acquired according to Lissajous figures, displayed by the oscilloscope, of the voltage signal and the current signal; 3, the magnetic inductance Lm of the primary-side winding of the high-frequency transformer and the leakage inductance Ls of a secondary-side winding of the high-frequency transformer are calculated; 4, the stray capacitance of the high-frequency transformer is calculated. Compared with the prior art, no precision equipment such as an impedance analyzer and a network analyzer is needed, the stray capacitance of the large-capacity high-frequency transformer can be conveniently and effectively extracted through simple voltage and current measurement, and research on the stray parameter effect of the large-capacity high-frequency transformer and improvement on the broadband frequency characteristics of the large-capacity high-frequency transformer are facilitated.

Description

technical field [0001] The invention relates to the technical field of circuit system analysis, in particular to a method for measuring the parasitic capacitance of a large-capacity high-frequency transformer. Background technique [0002] With the vigorous development of renewable energy power generation, the demand for DC bus interconnection in power systems is increasing. However, limited by the ability of the AC system to absorb DC power, traditional power equipment, grid structure, and operation technology are increasingly unable to accommodate large-scale renewable energy. DC grid technology can transmit and flexibly control large-scale DC power, which is an effective way to solve this problem. A large-capacity DC-DC converter with transformer magnetic coupling can realize the voltage level conversion of DC power, and is the key equipment for establishing and developing a DC power grid. Among them, large-capacity high-frequency transformers can achieve electrical iso...

AI Technical Summary

Problems solved by technology

However, the existing methods for extracting parasitic capacitances require frequency sweep measurements of transformers with the help of precision instruments such as impedance analyzers, which have high requirements for measurement equipment and practical operations

At present, there is a lack of simple measurement methods for the parasitic capacitance of large-capacity high-frequency transformers

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