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.