基于双闭环线性积分的高功率因数直流电子负载研究

High Power Factor DC Electronic Load Research Based on the Double Closed-Loop Linear Integral

摘要: 针对单闭环直流电子负载系统，研究了一种新型的基于双闭环线性积分的电子负载系统。外环主要利用PI调节器来消除静态偏差，同时提高转换速率，内环采用软硬件相结合的方法，利用低功耗微机控制滞环比较器，并研究了自适应控制算法用于控制PWM波的输出，使系统的功率因数得到了大幅提高。分析电子负载主要的干扰，设计光耦线性隔离方案，在负载端新添保护电路和通信接口，可以保证数据的安全性和完整性。最后实验结果表明，系统的功率因数提高至0.96，验证了该研究的可行性。

Abstract: According to single closed-loop DC electronic load system, this article studies a new type of elec-tronic load system based on double closed-loop linear integrals. The outer ring mainly uses PI regulator to eliminate static deviation and improve the conversion rate. The inner ring uses low power microcomputer control hysteresis comparator by the method of combining the software and hardware. Meanwhile this article studies the self-adaptation control algorithm to control the PWM. This way greatly improves the power factor of system. This article analyzes the interference of the electronic load and designs the scheme of linear opto-couple. In order to ensure security and integrity of the data, the protection circuit and the communication interface are added at the end of the load. Finally the experimental results show that the power factor of system has increased by 0.93 and verify the feasibility of the study.