Parasitic parameters of capacitor tank in converter and the effect on switching transient process

All parasitic parameters distributed in electromagnetic interference(EMI) coupling path will affect the transient process and electromagnetic compatibility(EMC) performance of converts. A simple parameter extraction method for DC link capacitor tank based on least square curve fitting is introduced. On the basis of the parasitic parameters as well as the DC bus model, the transient process of a single bridge circuit is simulated. The simulation result agrees well with the experimental waveform, which illuminates the reasonable accuracy of the equivalent circuit for capacitor tank. Circuit simulation demonstrates that the main loop characteristic is strong sensitive to parasitic inductance of capacitor tank.