In an inversion system, high reliability is one of the main targets pursuing. Some problems will threaten the reliability of the system, such as the shoot through issue and the failure of reverse recovery. The dual buck inverters can solve the above problems without adding dead time but the low magnetic utilization increases the volume and weight of the system. This paper firstly reviews the traditional dual buck topologies and a single inductor dual buck inverter which can make full use of the inductance. Then a kind of H3 dual buck phase leg with buffer inductor is proposed to improve the reliability of the MOSFET inverter. The novel method maintains the dual buck topologies' advantage of high reliability and can make full use of the inductance. Also, compared to the single inductor dual buck topology, the novel method can achieve lower conducting loss and simpler controlling strategy. Finally, the simulation and experimental results verified the theoretical analysis.