A novel nine-level inverter topology with double boost and reduced components is proposed by combining the voltage boost capacity of switched capacitors with the voltage halving characteristics of a coupling inductor.This inverter consists of 12 switches,2 switched capacitors and 1 reverse polarity coupling inductor.The charging and discharging of each capacitor in the inverter can maintain a self-balance,so the additional balance circuit is not needed.Compared with the topologies of most of the existing nine-level inverters that are based on switched capacitors,the proposed topology has a smaller capacity of switched capacitor.The output voltage levels are greatly increased by the adoption of the reverse polarity coupling inductor,and the current stresses on some switches are reduced by half,which can further reduce the switching loss.The working modes,modulation strategy,design of switched capacitors and loss analysis of the proposed topology are discussed in detail.In addition,the proposed topology is compared with those of other nine-level inverters,and its advantages are introduced.Finally,simulation and experimental results verified the effectiveness of the proposed topology.
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