Abstract: Single-phase inverters generally have secondary ripple problems, which can cause system instability and reduce efficiency. In this article, without additional switching tubes, only the original four switching devices of the H-bridge are retained. By splitting the original filter capacitor on the AC side into two symmetrical connections, the original supporting capacitor on the DC side could be omitted. The differential mode in the circuit guaranteed power output, and the common mode guaranteed decoupling, so the differential mode and common mode in the system are independently controlled. Theoretical analysis and simulation explain the decoupling of the system and the unbalanced capacitor voltage after decoupling, and explain the superiority of the topology in terms of decoupling accuracy and the number of additional switches. Finally, the experimental results prove that the topology has good decoupling performance without additional switching devices.