A 24-Pulse Aviation Rectifier Based on Auto-Fed Half-Bridge Auxiliary Circuit

In order to suppress input current harmonics and output voltage ripple and simplify the configuration of linear aero AC-DC converters, this paper proposes a 24-pulse rectifier based on an auto-fed half-bridge auxiliary circuit. It consists of a 12-pulse transformer, a rectifier bridge and an auxiliary circuit. The auxiliary circuit is simple in structure and its output is connected in parallel with the load. It injects AC voltage ripple into the DC bus, which is six times the frequency of the power supply. Thus, a 24-pulse DC output is obtained, and pulse multiplication is achieved. In this paper, the circuit structure, operating mode and harmonic suppression principle of the proposed 24-pulse rectifier are analyzed. The output current and output current ripple functions are derived, the parameter optimization study of the autotransformer is carried out, and the KVA rating of the autotransformer is discussed. The simulation and experimental results verify the correctness of the theoretical analysis and the feasibility of the proposed method.