Practical And Efficient Research Of Intelligent Power Supply

DC/DC converter is a strongly nonlinear, time-varying and uncertain system. Parametersof the circuit there are many uncertainties, the input and load is varied, the main circuitperformance must meet a wide range of input and load changes, which the DC/DC convertercontrol study becomes more difficult, due to the traditional transformation control methods arebased on the linear system theory, which is usually implemented using an analog circuit tocontrol the voltage or current applied to DC/DC converter and the desired dynamic effects cannot be obtained. Switching power supply for the complexity and time-varying, conventionalcontrol methods can not meet their requirements. Digital control with low power consumption,flexible design cycle is short, easy to implement modular management and cluster control,ease of introducing complex and delicate control strategies and so on. Fuzzy control, slidingmode variable structure control, neural networks, genetic algorithms and other controlmethods are widely used in DC/DC converter, showing a more superior than traditionalcontrol method performance.DC power supply is essential for scientific research equipment, traditional linear regulatorregulator performance, the output ripple is small, but the efficiency is only35%~60%;switching power efficiency up to70%~95%small size, light weight, but the adjustmentelement control circuit complexity, the ripple is large. Currently, most power is still dominatedby linear power, especially the power equipment used for experimental research.This paper will address these issues with a linear power supply switching power supplycombine both the advantages of both, using DC/DC series LDO method, taking into accountthe advantages of both, so that the output voltage ripple small, continuously adjustable. Inorder to further improve the efficiency of the whole system, the synchronous rectificationusing Buck circuit, reducing the freewheeling diode loss. When using constant pressuredifferential control on LDO, avoiding the output voltage varies over a wide range of input andoutput pressure increases due LDO losses arising. In the aspect of control strategy, combining the traditional PID control and fuzzy control, uses the adaptive fuzzy PID control, realize thereal green environmental protection and intelligent power supply. According to the design ofthe power of the technical indicators, completed the Buck converter main circuit componentsparameters is designed, and the design of the adaptive fuzzy PID controller, fuzzy PID controlis established in Simulink environment of Buck converter system model, has carried on thesimulation, verify the validity of the control strategy and system reliability. Finally,ARM-LPC2138as control platform, created a fuzzy PID control Buck converter regulatedpower supply series of intelligence, and experimental research. The experimental results showthat the feasibility of this method and the correctness of the theoretical analysis.