一种低交叉调整率的多路输出正激变换器设计方法  

A design method of multi-output forward converter with low crossover regulation

作　　者：程红丽[1] 田富涛 李勇 CHENG Hongli;TIAN Futao;LI Yong(School of Communication and Information Engineering,Xi’an University of Science and Technology,Xi’an 710054,P.R.China;Xi’an Hengway Electric Technology Co.,Ltd.,Xi’an 710100,P.R.China)

机构地区：[1]西安科技大学通信与信息工程学院,西安710054 [2]西安恒为电气科技有限公司,西安710100

出　　处：《重庆大学学报》2021年第11期89-100,共12页Journal of Chongqing University

基　　金：国家自然科学基金资助项目(51277149)。

摘　　要：多路输出正激变换器结构简单,可靠性高,应用广泛,但是存在交叉调整率问题,为了从根本上改善多路输出正激变换器的交叉调整率问题,提出了一种目标平均电流控制策略。通过ARM-STM32(嵌入式单片机,Acorn RISC Machine-STMicroelectronics 32)采样各路输出端的实时电压和实时电流,得到实时负载,结合期望输出电压算出目标平均电流,根据目标平均电流和多路输出正激变换器的硬件参数计算出主路开关管和每一路副边整流开关管的导通时间,由程序自动控制各开关管的导通时间来实现各输出路的输出平均电流等于目标平均电流。实验结果表明,采用输出平均电流控制的多路输出正激变换器具有小于1.6%的交叉调整率,由该策略控制的多路输出正激变换器不仅可以实现低交叉调整率,而且具有较高的电压精度。The multi-output forward converter has many advantages,including simple structure,high reliability,and wide application,but there is a problem of cross regulation.To fundamentally improve the cross regulation rate,a target average current control strategy was proposed.Firstly,the real-time load was obtained by sampling the real-time voltage and real-time current of each output terminal with ARM-STM32(Acorn RISC Machine-STMicroelectronics 32).Then the target average current was calculated by combining the real-time load with the expected output voltage.According to the target average current and the hardware parameters of the multi-output forward converter,the conduction time of the main circuit switching transistor and each secondary side rectifier switching transistor was calculated.The program automatically controlled the conduction time of each switching transistor to achieve the goal that the average output current of each output circuit equals the target average current.The experimental results show that the multiple output forward converter using output average current control has a cross regulation rate of less than 1.6%.The multiple output forward converter controlled by this strategy can not only achieve a low cross regulation rate,but also has a higher voltage accuracy.

关 键 词：多路输出 正激变换器 交叉调整率 电流控制 

分 类 号：TM46[电气工程—电器]