Research On High-power Parallel Switching Power Supply

With the development of the electronic semiconductor devices and soft-switching technology, high-power switching power supply has been widely applied, and it shows a distinct advantage in efficiency, size, weight, power factor, response speed, etc. compared to the traditional phase-controlled rectifier power supply. This paper first studied the principle of the phase-shifted full-bridge zero-voltage converter and parameter design methord of the main circuit, and a new design program for high-frequency transformer windings with water-cooled copper tube instead of multi-strand copper wire is presented. The power source uses module parallel technology, microprocessor technology and improved master-slave settings, this design style makes it easy to realize N+1 redundancy. The system's accuracy of current sharing between modules and response characteristics were verified by the simulation of MATLAB. Then, using AVR microcontroller and UCC3895 as the core control devices, a control system combined digital and analog is designed, the hardware and software about the design is introduced in details. Finally, a 55V/3000A power supply prototype is designed, and practical experimental waveforms and data are given.