Research on transient characteristics of freewheeling oscillation of capacitive pulse power supply
The capacitive pulse power supply is easy to oscillate in the capacitor branch and the free-wheel diode branch.The oscillation phenomenon will cause the loss of the diode and the increase of the reverse charging voltage of the pulse capacitor,which will affect the operation life of the diode and the pulse capacitor.Therefore,an analytical model for the process of continuous discharge of capacitive pulsed power supply was established whereby the current curves of capacitor and load branch were ob-tained,and the generation mechanism of freewheeling oscillation and the influencing factors of oscilla-tion characteristics were analyzed.And then,based on vector matching method of frequency domain,and through the work frequency band range impedance curve fitting,the broadband equivalent circuit of stray parameters of capacitance branch and freewheel branch was established,with which the in-stantaneous change rule of stray parameters during the freewheeling oscillation process was represen-ted,thus realizing the accurate description of the oscillation amplitude and cycle of the freewheeling transient process.Finally,the pulse discharge test platform was built to conduct simulation and ex-perimental comparison of capacitor discharge current waveform.The comparison results show that the proposed theoretical model is correct.
pulse power supplyfreewheeling oscillationstray parametersvector fitting
万方数据
维普
