The three-level DC converter has attracted wide attention in both industry and academia because the voltage stress of primary switches is only V_in/2, and it also has advantages such as a simple structure and good soft-switching characteristics. In high-power HVDC conversion applications, the IGBT-based zero-voltage zero-current switching(ZVZCS) three-level DC-DC converter is the mainstream solution owing to its high current handling capacity, wide soft-switching load range, and low primary-side conduction loss. However, ZVZCS three-level DC converters still face some problems, such as the resetting difficulty in primary-side current and the increasing voltage stress of rectifier diode, which limit their applications in high-power scenarios. A novel ZVZCS flying capacitor asymmetric PWM half-bridge three-level DC-DC converter is proposed, which utilizes a current reset circuit with controllable voltage to ensure a wide soft-switching range of primary switches. Meanwhile, the voltage stress of rectifier diode one the secondary side is low. The MOSFETs in the reset circuit can achieve zero-voltage switching(ZVS) turning off and zero-current switching(ZCS) turning on. In addition, a bi-directional switch is series connected with the flying capacitor to prevent the reverse current of i_p in the free-wheeling mode. This bi-directional switch can achieve ZVS turning off and ZCS turning on over the entire load range, so the added power loss is negligible. The circuit configuration, operation principle, and characteristics were discussed, and a 6.5 kW prototype was designed to verify the working principle.