A Family of Voltage Balancers With Fault-Tolerance and Interpolar Voltage Self-Balancing Ability for Bipolar DC Power Systems

The bipolar DC power architecture provides a new high-efficiency and high-reliability solution. Maintaining interpolar voltage balance is crucial in bipolar structures to ensure the reliable and stable operation of the system. This paper proposes a family of bipolar DC-DC converters based on bipolar voltage multipliers (BVM). Notably, the proposed BVM structure has the capacity to autonomously achieve interpolar voltage balance without external balance control strategy. This inherent feature significantly alleviates control circuit complexity. Meanwhile, the BVM structure possesses rectification functionality, facilitating its connection to various front-stage structures with AC output. This paper provides a detailed exposition of the operational principles and performance analysis of the proposed voltage balancers and discusses a 1 kW prototype experiment. The experimental results validate the accuracy of the theoretical analysis.