Digital enhanced V2-type constant on-time control using inductor current ramp estimator for a buck converter with small ESR capacitors

2010 IEEE Energy Conversion Congress and Exposition Pub Date : 2010-11-01 DOI:10.1109/ECCE.2010.5617978

K. Cheng, Feng Yu, P. Mattavelli, F. Lee

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引用次数: 14

Abstract

This paper presents a new enhanced V2-type constant on-time control architecture with digital implementations for solving the ripple oscillation issues when using small ESR capacitors in a buck converter. Instead of directly sensing the inductor current, an inductor current ramp estimator with the drift compensation is proposed as adding a virtual ESR ripple to the output voltage ripple. Only the input and output voltages are required to be sampled for the current ramp estimation. Hence the sampling-rate requirements for the analog-to-digital converters (ADCs) in the digital implementations are not critical. The limit-cycle oscillations due to the sampling effects can be improved by using the estimated current ramp with compared to the direct current sampling. Besides, the small-signal modeling of the digital enhanced V2 control architecture can provide the design guideline for choosing the current feedback gains. The effectiveness of the proposed control architecture and the current ramp estimator has been verified with simulation and experimental results.

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采用电感电流斜坡估计器的数字增强v2型恒定准时控制，用于具有小ESR电容的降压变换器

本文提出了一种新的增强型v2型恒定实时控制体系结构，并采用数字实现，用于解决降压变换器中使用小型ESR电容器时的纹波振荡问题。提出了一种具有漂移补偿的电感电流斜坡估计器，代替直接感知电感电流，在输出电压纹波上增加一个虚拟ESR纹波。仅需要对输入和输出电压进行采样以进行电流斜坡估计。因此，数字实现中模数转换器(adc)的采样率要求并不重要。与直流采样相比，利用估计的电流斜坡可以改善由采样效应引起的限环振荡。此外，数字增强V2控制体系结构的小信号建模可以为电流反馈增益的选择提供设计指导。仿真和实验结果验证了所提出的控制结构和电流斜坡估计器的有效性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2010 IEEE Energy Conversion Congress and Exposition

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