基于软开关与交错并联技术的VRM的研究与设计

发布时间：2018-07-10 10:55

本文选题：低压大电流 + 电压调节模块　；参考：《西安电子科技大学》2014年硕士论文

【摘要】：电压调节模块(Voltage Regulator Module VRM)是用来为快速微处理器供电的DC/DC电源模块。其发展趋势为输出低电压、大电流、瞬态响应快、电压纹波小,电源体积小,工作频率高,效率及可靠性高。论文基于VRM的技术发展和应用要求,研究设计一款48V输入、1.2V/150A输出的电压调节模块。在微处理器对VRM性能需求分析的基础上,论文确立设计的总体方案为:主电路采用“不对称半桥+多相交错并联SR-Buck”两级式变换拓扑结构,控制电路采用复合控制方式。前级主电路设计采用软开关技术,有效解决了高频引起的开关损耗问题,减小电路损耗。后级主电路采用同步整流、交错并联及并联均流三种关键技术。引入同步整流技术,减小输出整流损耗;采用交错并联技术减小输出滤波电感、电容的容量,提高输出的动态响应速度;应用并联均流技术解决交错并联引起单元电路工作电流分布不均的问题,可有效提高变换器的可靠性。高频变压器设计方面,采用调节副边绕组匝比来消除变压器直流偏磁电流,有效解决变压器正负伏秒积不平衡引起的直流偏磁现象。在对前、后级电路参数计算及控制电路设计基础上,分别对前、后级设计电路应用Saber和MATLAB/Simulink仿真软件进行建模与仿真,仿真结果验证理论分析正确性与设计方案的可行性。仿真表明:VRM输出电压为1.201V,电压纹波系数为0.15%;总的输出电流为150.01A,电流纹波系数为0.2%;效率高达89.7%;均满足设计要求。
[Abstract]:Voltage regulator Module (VRM) is a DC / DC power supply module used to power a fast microprocessor. Its development trend is low output voltage, high current, fast transient response, small voltage ripple, small power supply volume, high working frequency, high efficiency and high reliability. Based on the technical development and application requirements of VRM, a 48V voltage regulation module with 1.2V / 150A output is designed. Based on the analysis of VRM performance requirement of microprocessor, the overall scheme of the design is as follows: the main circuit adopts the "asymmetrical half-bridge multi-phase parallel SR-Buck" two-stage transformation topology, and the control circuit adopts the compound control mode. The soft switching technology is used in the design of the front stage main circuit, which effectively solves the problem of switching loss caused by high frequency and reduces the circuit loss. The main circuit adopts three key technologies: synchronous rectifier, staggered parallel connection and parallel current sharing. The synchronous rectifier technology is introduced to reduce the output rectifier loss, the interleaving parallel connection technique is used to reduce the capacity of the output filter inductor and capacitance, and the dynamic response speed of the output is improved. The application of parallel current sharing technique to solve the problem of uneven distribution of working current caused by interleaving parallel connection can effectively improve the reliability of the converter. In the design of high frequency transformer, the DC bias current of transformer is eliminated by adjusting the turn ratio of secondary side winding, and the phenomenon of DC bias caused by unbalance of positive and negative volt second product of transformer is effectively solved. On the basis of parameter calculation and control circuit design of front and back stage circuit, the model and simulation of front and back stage design circuit are carried out by using Saber and MATLAB / Simulink simulation software respectively. The simulation results verify the correctness of theoretical analysis and the feasibility of the design scheme. The simulation results show that the output voltage of VRM is 1.201 V, the ripple coefficient of voltage is 0.15, the total output current is 150.01A, the coefficient of current ripple is 0.2, the efficiency is up to 89.7V, and all meet the design requirements.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM46

【共引文献】