A General Method for Two-Level Bridge Type DC/DC Converter to Three-Level DC/DC Converter

This paper studies the approach of derivation of three-level (TL) half-bridge (HB) topology from conventional full bridge DC/DC topology. The derived TL HB topology has same device count and performance as the corresponding full bridge topology, and it is more suitable for high voltage applications. The derivation approach for different control method, i.e. PWM control, frequency control and phase shift control, are presented. Some novel TL HB topologies are proposed based on the approach. The experimental results from these novel topologies verify the validity of the proposed derivation approach.