基于DSP的多相并联同步整流电路研究
发布时间：2018-07-29 18:55
【摘要】：同步整流技术多应用于低压输出的开关电源之中,其基本原理是利用MOSFET的通态电阻极低这一特性来降低电路损耗。随着新型电子产品对供电要求的不断提高,同步整流电路越来越广泛地应用于低压大电流输出环境中。但是单相的同步整流电路输出能力有限且随着输出电流增大,转换效率会降低。本课题即针对以上问题研究了多相同步整流电路并联运行的解决方案。在该方案中,其关键技术是实现多相并联同步整流电路的均流输出。 本文在分析同步整流电路拓扑结构和现有均流技术的前提下,选取双管正激为基本拓扑结构,并对原有结构做了改进；在控制方法方面,采用最大电流自动均流法作为均流控制的主要控制策略；本文介绍了并联模块电路的主要参数的设计方法,包括输入、输出滤波电容的计算与选择,变压器的参数设计,驱动电路的设计等；利用DSP实现系统的数字PID控制。本文设计了一种全新的控制方式,使得电路可以根据负载变化自动切换工作模式,保证电路在不同负载条件下都能达到最优的转换效率,从而提高了多相并联电源的功率密度以及可靠性。 利用Matlab自带的Simulink平台搭建了三相并联同步整流电路仿真模型,分别对单相的同步整流电路和三相并联电路进行了仿真,通过改变电路的负载测得电路在不同负载条件下的转换效率。仿真结果证明,多相并联同步整流电路可以解决单相电路负载能力有限的问题,仿真结果同时说明,利用多相并联技术,电路的等效工作频率得到了提高,输出电压的纹波值得到了降低。
[Abstract]:Synchronous rectifier technology is widely used in switching power supply with low voltage output. Its basic principle is to reduce circuit loss by using the characteristic of very low on-state resistance of MOSFET. With the increasing demand of new electronic products, synchronous rectifier circuits are more and more widely used in low-voltage and high-current output environment. But the output capacity of single phase synchronous rectifier circuit is limited and the conversion efficiency decreases with the increase of output current. In view of the above problems, the solution of parallel operation of multiphase synchronous rectifier circuit is studied in this paper. In this scheme, the key technology is to realize the current-sharing output of multiphase parallel synchronous rectifier circuit. On the premise of analyzing the topology of synchronous rectifier circuit and the current sharing technology, this paper selects the double transistor forward as the basic topology, and improves the original structure. This paper introduces the design methods of the main parameters of the parallel circuit, including the calculation and selection of the input, output filter capacitance, the design of the transformer parameters, and the design of the main parameters of the parallel module circuit, including the calculation and selection of the output filter capacitance, the calculation and selection of the output filter capacitance, and the design of the transformer. The design of drive circuit and DSP are used to realize the digital PID control of the system. In this paper, a new control method is designed, which can automatically switch the operation mode according to the load change, and ensure that the circuit can achieve the optimal conversion efficiency under different load conditions. Thus, the power density and reliability of the multiphase parallel power supply are improved. The simulation model of the three-phase parallel synchronous rectifier circuit is built by using the Simulink platform of Matlab, and the single-phase synchronous rectifier circuit and the three-phase parallel circuit are simulated, respectively. The conversion efficiency of the circuit under different load conditions is measured by changing the load of the circuit. The simulation results show that the multi-phase parallel synchronous rectifier circuit can solve the problem that the load capacity of single-phase circuit is limited. The simulation results also show that the equivalent working frequency of the circuit is improved by using the multi-phase parallel technology. The ripple of the output voltage is worth reducing.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM461
本文编号：2153674
[Abstract]:Synchronous rectifier technology is widely used in switching power supply with low voltage output. Its basic principle is to reduce circuit loss by using the characteristic of very low on-state resistance of MOSFET. With the increasing demand of new electronic products, synchronous rectifier circuits are more and more widely used in low-voltage and high-current output environment. But the output capacity of single phase synchronous rectifier circuit is limited and the conversion efficiency decreases with the increase of output current. In view of the above problems, the solution of parallel operation of multiphase synchronous rectifier circuit is studied in this paper. In this scheme, the key technology is to realize the current-sharing output of multiphase parallel synchronous rectifier circuit. On the premise of analyzing the topology of synchronous rectifier circuit and the current sharing technology, this paper selects the double transistor forward as the basic topology, and improves the original structure. This paper introduces the design methods of the main parameters of the parallel circuit, including the calculation and selection of the input, output filter capacitance, the design of the transformer parameters, and the design of the main parameters of the parallel module circuit, including the calculation and selection of the output filter capacitance, the calculation and selection of the output filter capacitance, and the design of the transformer. The design of drive circuit and DSP are used to realize the digital PID control of the system. In this paper, a new control method is designed, which can automatically switch the operation mode according to the load change, and ensure that the circuit can achieve the optimal conversion efficiency under different load conditions. Thus, the power density and reliability of the multiphase parallel power supply are improved. The simulation model of the three-phase parallel synchronous rectifier circuit is built by using the Simulink platform of Matlab, and the single-phase synchronous rectifier circuit and the three-phase parallel circuit are simulated, respectively. The conversion efficiency of the circuit under different load conditions is measured by changing the load of the circuit. The simulation results show that the multi-phase parallel synchronous rectifier circuit can solve the problem that the load capacity of single-phase circuit is limited. The simulation results also show that the equivalent working frequency of the circuit is improved by using the multi-phase parallel technology. The ripple of the output voltage is worth reducing.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM461
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