Abstract: With high power density and easy paralleling, the non-isolated Weinberg converter (NIWC) is suitable as battery discharge regulator (BDR) and DC-DC converter after sequential switch shunt maximum power regulator (S3MPR) or sequential switch series shunt maximum power regulator (S4MPR) in space power system. The working principle of the converter is analyzed, its small-signal model is deduced. In the premise of ensuring output voltage and current ripples, the main circuit parameters are designed. After the analysis of system transfer function with Matlab, in order to ensure rapidity and stability of the system, the active lead-lag compensation network is designed. The simulation and experimental results verify the correctness of system design.