This paper proposes a novel primary double winding coupling topology of the DC transformer (DCT) for DC micro-grid applications. The primary side high-frequency full-bridge inverter is replaced by a novel topology without shoot-through problem. As a result, the reliability of the system is improved, and dead-time is unnecessary to be added to the driving signals thus the dc voltage utilization is higher. Compared to the no dead-time dual-buck inverter, the proposed topology has more advantages in the size and cost, because the primary two windings can be integrated on the same core. Aiming at DC micro-grid system, this paper studies and designs a non-dead zone topology. We carry out equivalent transformation of transformer, the working principle is analyzed, and the calculation and analysis of compensation and efficiency are given. Finally, the simulation and experimental results show that the proposed topology is advanced.