The Research Of Digital Control Technique Of Communication Power Supply Based On DSPic

Digital control technique is becoming more and more popular in the field of switching-mode power supply (SMPS).It usually consists of three key building blocks: analog-to-digital converter(ADC),digital compensator and digital pulse-width modulator. This thesis has summarized the most advanced techniques for high-frequency SMPS key building blocks reported in the world.There are many difficult problems to take in technique, if digital power supply wants to realize the practicability and marketability. The resolution of ADC and DPWM brings the system the hidden trouble of limited cycle surge, the time-resort make voltage rapidly dynamic modulation of the power supply difficult, and the digital compensator which must finish much multiplicative and additive operation into one switch-period in order to update the new duty information is requested to run in high-speed mode. This thesis’ research and discussion focuses on the solvability of this difficult problems. Making use SISOTOOL block in matlab, the paper designs the digital compensator arithmetic named 2P2Z by directed digital design. According to the design-process of high-frequent switching-mode power supply, this thesis has introduced the selection of the main elements, and the circuit has been optimized by SIMULINK block in matlab to research steady and dynamic performance.In order to validate the analysis of theory and the emulator result, this paper designs and realizes a full-bridge digital power supply module based on DSPic30F2020, by 2P2Z digital arithmetic. Due to the experimental conclusion, with stabilization and good performance, this digital power supply can meet the need of application.