Research On Parallelable Switched Mode DC Power Module

Vacuum electricity arc furnace is an important equipment for melting precision metal and precious metal, One of its core parts is the DC power supply. With full control of power electronic devices capacity increasing, performance improving and application technology constantly breakthrough, switch mode DC power supply will be used in the vacuum arc furnace system. As the traditional thyristor power supply voltage regulator and saturable reactor source exists some disadvantages such as large volume, low efficiency, high noise, large output ripple and slow dynamic response, etc. And the traditional analog control frequency hard switching DC power supply also exists some drawbacks, such as high switching losses, poor stability, low reliability and low power density. So the development of high-quality DC power module must be particularly important.This paper analyzes the research status of switching power supply, compare the main circuit topology and control modes, and according to the performance indicators parallelled switch DC power supply module, determined overall structure of the system,selected phase shifting ZVS-PWM DC-DC converte which is simple and mature,elaborated on how it works. Not only the design the power module hardware parameters and build a mathematical model of the system, but also design a constant current or constant voltage controller, paralled current sharing method based on virtual resistance and digital system control program based on DSP TMS320F2812. Combining phase-shifted full-bridge soft-switching technology, digital control technology and digital parallelled current sharing technology designed parallelable switched DC power supply module, the output power is 3000A/50 V, the switching frequency is 24 k Hz.By Matlab/Simulink to build a simulation model of the system, and then build an experimental platform. Verify the theoretical analysis and program through simulation and experimental analysis.