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.
作者
张文佳
邢艳军
朱立颖
张明
闵闰
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)
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)。
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
boost circuit
predictive ripple current control
boundary conduction mode
damped current model
self-recovery
inductor deviation tolerance
