| For some special power supply occasions,the Voltage Regulation Module(VRM)is required to have the characteristics of low output voltage and current ripple,fast dynamic response,low voltage and high current as well as density.The traditional single-phase Buck converter can not meet these requirements above.However,the proposal of multi-phase interleaved parallel technology makes it possible.The VRM can supply power to the load stably and efficiently by choosing the appropriate control strategy combined with the multi-phase interleaved parallel technology.Therefore,it is worthwhile to study the topology structure and corresponding control strategy of multi-phase interleaved parallel Buck converter.To the traditional single-phase Buck converter,the output ripple is large,the energy conversion efficiency is low,and the traditional PID control has poor effect on the dynamic response control of the switching converter with nonlinear and time-varying characteristics.In this paper,the four-phase interleaved parallel synchronous Buck converter is combined with the single neuron adaptive PID control algorithm to improve the performance of the converter.The interleaved parallel topology has high frequency and low ripple characteristics,which is beneficial to the weight reduction of the converter and the design of the filter network.And based on the analysis of four working modes of four-phase interleaved Buck converter,a small-signal model method is used to establish a mathematical model for the converter,and a suitable compensation network is designed according to the frequency response curve.At the same time,with the MATLAB/Simulink simulation platform,the single neuron adaptive PID and the traditional PID control algorithm are used for the voltage closed-loop control of the four-phase interleaved parallel synchronous Buck converter.The simulation results show that the converter is superior to the traditional PID control in terms of static stability,dynamic response speed and control precision under the single neuron adaptive PID control strategy.Finally,an experimental prototype with input of 55-65 VDC,rated output of 28V/200 A and power to mass ratio of 4.4kW/kg and its test platform are developed.It can be seen from the data and waveforms tested in the full power range that the designed converter has a dynamic response speed greater than 50 A/ms,an output voltage ripple of less than 0.2 V,and an energy conversion efficiency of over 95%. |
