Abstract
The full-bridge converters has been found widely use in many applications. With the increment of system power ratings, the soft-switching technique has become much more emphasized. The loss limited full bridge converter has been chosen for the system in this thesis, and the concept of multi-turn coaxial winding transformer is adapted to the system isolation transformer. Two different multi-turn coaxial winding transformer designs is analyzed and fabricated. Several simulations have been made to verify the system. The SYNOPSYS Saber Designer is used to simulate the primary switching waveforms of the full-bridge zero-voltage-switching circuit. Simulation results by using the ANSOFT Maxwell 2D Field Simulator is also provided to verify the multi-turn coaxial transformer design. An elementary test has been made to verify the basic operation of the proposed system. The fabricated multi-turn coaxial winding transformer has been implemented into the system and was tested. The experiment data is compared with the theoretical ones to verify the designs.