Abstract: Aiming at the problems of the Δ-source inverter(DSI) of large voltage spike of the switch and poor output power quality under high gain, a voltage clamping cell is added on the basis of the split Δ-source inverter(SDSI), and an improved split Δ-source inverter(ISDSI) is proposed. The topological structure and working state of the inverter are studied, the steady-state voltage boosting characteristics and the process of eliminating voltage spikes are analyzed, and the voltage stress of each switching device is calculated. The proposed topology retains the advantages of SDSI boost duty ratio and modulation factor adjustment in the same direction, which helps to improve the output power quality at high voltage gain. The results of Matlab/Simulink software simulation and prototype experiment verify the performance of the converter, and prove the proposed inverter can effectively solve the outstanding problems existing in Δ-source inverter.