Based On The Full-bridge Switching Power Of The Dsp Frequency Communications Research And Design

In recent years, with the rapid development of large-scale integrate circuits, micro-controller and digital singal processor continuous improve the cost-effective, digital control technology has been gradually applied to large and medium-power high-frequency switching power supply. Compared to traditional analog control, digital control power supply has advantages such as design with a flexible, less external control circuit, to be used in more advanced control algorithms, and high reliability.High frequency switch power supply, which has the advantages of light, high efficiency and small output voltage ripple, now has been applied step by step in the new type power system of modern communication devices. Aim at the problem of the bigger of wastage and the bigger of overshoot and the bad of dynamic speciality in traditional switch-power, using the technique of full-bridge soft switch based on DSP. The technique of full-bridge soft switch is completed by the aptitude DSP system, sampling differential signal transmission, adopting fuzzy adaptive PID control arithmetic, producing digital PWM work with drive circuit to control full-bridge switch. It will use the power factor correct which adopt the average current control technique, which can make current follow voltage and make the power factor reach 1. The results of simulation from Matlab to make clear that fuzzy adaptive PID arithmetic has better capability in overshoot, adjust-time, dynamic speciality relative to traditional PID control arithmetic.On the base of theory of switching power supply, the paper completes the design of main circuit, assistant circuit, control loop, software, and completes the simulation with MATLAB.Focuses on high-frequency transformer design and fuzzy adaptive PID controller implementation. Auxiliary power supply and control circuit have been designed into boards, and do some waveform analysis and related experiments based on this circuit.