A shoot-through current suppressed Y-source inverter with low voltage spike
To solve the high DC-link voltage and shoot-through current in traditional coupled-inductor im-pedance-source inverters,a shoot-through current suppressed Y-source inverter with low voltage spike was proposed.The shoot-through and non-shoot-through operational modes were analyzed in detail and key waveforms were provided.By applying current-second and voltage-second integrated over a switching pe-riod,the voltage and current stresses of the key devices was derived.Compared with improved Y-source inverter,the proposed topology applies lower shoot-through ratio when considering same voltage gain and winding factor,which increases the modulation ratio range and improves the efficiency of DC-link volt-age,and reduces DC-link voltage spikes.Moreover,it can suppress the increment of shoot-through cur-rent.When the DC-link voltage is the same,the proposed topology requires a smaller shoot-through time,resulting in a less conduction losses in shoot-through state.Finally,a 240 W prototype was built and ex-perimental results verify the superiority of the proposed Y-source inverter.
Y-source invertercoupled inductorshoot-through current suppressionvoltage spikevoltage and current stressespower losses analysis
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