Boost变换器BCM电流自恢复及数字预测纹波控制电路设计  

BCM current self-recovery and digital predictive ripple control circuit for boost converter

作　　者：张文佳[1] 邢艳军[1] 朱立颖[1] 张明[1] 闵闰[2] ZHANG Wenjia;XING Yanjun;ZHU Liying;ZHANG Ming;MIN Run(Beijing Institute of Spacecraft System Engineering,Beijing 100094,China;School of Optical and Electronic Information,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]北京空间飞行器总体设计部,北京100094 [2]华中科技大学光学与电子信息学院,湖北武汉430074

出　　处：《微电子学与计算机》2022年第7期101-107,共7页Microelectronics & Computer

基　　金：CAST创新基金项目(CAST-2021-01-04)。

摘　　要：为了解决电感值不准确导致的boost变换器模型偏差,进而不能实现良好的临界导通模式控制问题,提出了一种基于电流自恢复的数字预测纹波控制电路.根据电感电流的纹波特性,该控制器预测开关元件的导通及关断时间,将电感电流控制在临界导通模式.基于电感电流阻尼模型,证明了电感电流具有自动恢复到临界导通模式的特性,因而不需要电流检测一般所需的电流传感器或零电流检测电路;同时也证明了在电感失配的情况下,该控制器也能确保实现临界导通电流模式.此外,所提出的电感电流阻尼模型在分析和优化功率电路上具有潜在价值.仿真与实验结果验证了基于预测纹波电流下boost变换器的自恢复特性及电感容差特性.In order to solve the error caused by inductor mismatch,and the induced boundary conduction mode(BCM)control issues,this paper proposes a current self-recovery and digital predictive ripple control circuit for boost converter.According to the inductor ripple current the proposed controller predict the turn-on and turn-off time of the main switch,and then achieves BCM operation.Based on a damped inductor current model,the controller is proved to have a BCM-self-recovery feature.Therefore,current sensor or zero-current detection circuit,which is often used in BCM operation,is eliminated.When there is inductance mismatch,the controller can also maintain consistent BCM operation.Furthermore,the proposed current model indicates the behavior of inductor current under the influence of parasitic parameters,which has potential values in analyzing and optimizing the power stage.Simulation and experimental results verify the self-recovery feature and inductance deviation tolerance feature in a boost converter under predictive ripple current control.

关 键 词：BOOST电路 数字预测纹波控制 临界导通模式 电流阻尼模型 自恢复 电感容差 

分 类 号：TP274[自动化与计算机技术—检测技术与自动化装置]