基于磁芯复位的脉冲变压器剩磁抑制与输出特性分析OA

Pulse transformers are widely used in gas switch triggers.Residual magnetism in the magnetic core leads to weak consistency of the output waveforms during repretitive frequency operation,causing variations in the con⁃duction delay and jitter of the gas switch.Magnetic core reset is an effective method for eliminating the influence of residual magnetism.The current research is primarily based on empirical formulas to estimate the reset current,re⁃sulting in such problems as long resetting time and insufficient accuracy.By testing the pulse magnetization charac⁃teristics of the magnetic core,a field⁃circuit coupling model of the pulse transformer based on core nonlinearity is set up.The effects of remanence and reset processes on the output characteristics are analyzed,and such key param⁃eters as reset current,isolation inductance and bypass capacitance are simulated and optimized.For 20 kV⁃class gas switch triggers,its output performance under repeated⁃frequency conditions is tested in accordance with the op⁃timized magnetic core reset circuit.The experimental results show that the designed DC reset circuit can effectively isolate high⁃voltage pulses and enhances core utilization rate.The average amplitude of the pulse output waveform is 19.88 kV,with a coefficient of variation of 0.08％.The average pulse rise time is 3.32 μs,with a coefficient of variation of 0.42％.The average pulse width is 3.77 μs,with a coefficient of variation of 0.21％.The waveform exhib⁃its high consistency.