消除DC/DC斜坡补偿对带载能力影响的方法研究  

Research on the Method to Eliminate the Influence of DC/DC Slope Compensation on Load Capacity

作　　者：郭仲杰 刘申 刘楠 卢沪 GUO Zhong-jie;LIU Shen;LIU Nan;LU Hu(Xi'an University of Technology,Xi'an 710048,China)

机构地区：[1]西安理工大学,自动化与信息工程学院,陕西西安710048

出　　处：《电力电子技术》2022年第8期114-118,共5页Power Electronics

基　　金：国家自然科学基金面上项目(62171367);陕西省创新能力支撑计划(2022TD-39)。

摘　　要：这里提出了一种消除斜坡补偿对带载能力影响的设计方法,在保持电感电流采样模块采样系数不变的情况下,对采样电流叠加一个随占空比变化的负直流电流,从而消除斜坡补偿对系统带载能力的影响。采用此方法,完成了一款基于0.18μm BCD工艺的Boost型DC/DC转换器的电路设计、版图设计与物理验证,输入电压范围2.9~4.5 V,输出电压4.6 V,带负载能力300 mA,实验结果显示,当占空比在20%~80%范围内变化时,提出的斜坡补偿方法可以将带载能力提升90%以上,且电路功耗仅为368~497μW,转换效率高达95%。该方法很好地解决了系统小占空比下的过补偿问题以及大占空比下的带载能力衰减问题,为大负载的DC/DC转换器系统设计提供了新的思路。A design method is proposed to eliminate the influence of slope compensation on the load carrying capacity.In the case of keeping the sampling coefficient of the inductor current sampling module unchanged,a negative value that changes with the duty cycle is superimposed on the sampling current.Thereby eliminating the influence of slope compensation on the system load capacity.Using the proposed method,the circuit design,layout design and physical verification of a Boost DC/DC converter based on 0.18μm BCD process are completed.The input voltage range is 2.9~4.5 V,the output voltage is 4.6 V,and the load capacity is 300 mA,the experimental results show that when the duty cycle changes in the range of 20%~80%,the proposed slope compensation method can improve the load capacity by more than 90%,and the circuit power consumption is only 368~497μW,the conversion efficiency is up to 95%.This method can well solve the problem of overcompensation under the small duty cycle of the system and the loop stability problem under the large duty cycle of the system,improve the load carrying capacity of the chip,and provide a new idea of the DC/DC converter system with a large load design.

关 键 词：转换器 斜坡补偿 带载能力 转换效率 

分 类 号：TP622[自动化与计算机技术—控制理论与控制工程]