High-frequency Link Inverter Based On DSP

This paper applied high frequency linked technology and the digital signal processing technology, researched and realized high frequency linked inverter power supply based on DSP. The switching frequency of the power supply reaches 75 KHz, the power reaches 500W, realized the partial ZVT, The efficiency obtained the enhancement.First, the paper summarized high frequency linked inverter power supply and the power supply digitized technology. Through introducing the domestic and foreign present research work development, the necessity and significance of researching on and realizing this kind of power supply was illuminated.In the paper, the scheme of the current supply AC high frequency linked topology was applied. Through the qualitative analysis, the theory reasoning, and the simulation research, it explained that, in this scheme, the harmonic component of the output SPWM wave is lower, the switching stress is smaller, the high frequency is easier to realize, the filter circuit is easier to design.In view of the high frequency full-bridge inverter part, the paper introduced the phase shifting control method in detail. With power MOSFET output capacitor and the resonant inductance, ZVT soft switching was realized. The efficiency of the power supply obtains the enhancement; the high frequency noise was under the effective suppression.In view of the inverter power supply control system, the paper applied the double closed-loop PID feedback control algorithm. The dynamic corresponding speed is quicker; it is more advantageous to the system static error elimination. The paper has carried on the theoretical analysis to the algorithm, introduced the digitized realization method based on DSP in detail, and has given the programming flow.The paper applies Matlab/Simulink conducts the modelling simulation research to the inverter power supply system, including the phase shifting SPWM wave, the power circuitry, and the feedback control system, which confirms the validity of the topic in the simulation view, and which has guided the software and hardware design of the power supply.The control of the power supply applied DSP (TMS320F2812) chip, the paper researched and has designed invertor control circuit which takes DSP as the core, elaborated the control circuit system software and hardware design process and the flow in detail.The paper final presented the invreter power supply prototype and its experimental results.