Influence of parasitic parameters on output waveform of pulse transformer:analysis and verification
Based on the technical specifications of fast response pulse transformer,an equivalent circuit analysis method was employed to theoretically analyze the impact of parasitic parameters on the rise time,flat top,and falling edge of the output pulse waveform.It is observed that a smaller leakage inductance and parasitic capacitance of the transformer lead to an shorter delay time in the output pulse waveform.Conversely,larger leakage inductance and parasitic capacitance result in smoother rising and falling edges of the output pulse waveform,accompanied by higher overshoot amplitudes.According to the theoretical analysis results,a pulse transformer structure with small leakage inductance and parasitic capacitance is designed.The leakage inductance and parasitic capacitance are analyzed by finite element simulation,and the pulse transformer is built and the equivalent excitation impedance and parasitic parameters of the pulse transformer are measured by impedance analyzer.The measured curve is fitted by multi-stage series-parallel RL model,and the fitted multi-stage series-parallel RL model is simulated in Saber to obtain the delay time,which verifies the correctness of theoretical calculation.Finally,the delay time,overshoot and top drop are obtained by capacitor discharge,these findings serve as a valuable reference for the design of pulse transformers.
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