Characterization and performance comparison of ripple-based control for voltage regulator modules
Characterization and performance comparison of ripple-based control for voltage regulator modules
复制标题
DOI：
10.1109/tpel.2005.869747
复制
发表时间：
2006-03
影响因子：
6.7
通讯作者：
Jian Sun-
中科院分区：
文献类型：
--
作者：
Jian Sun-
分析比较了近年来发展起来的三种电压调节模块控制方法，即V/sup 2/控制、增强型V/sup 2/控制和无输出电压动态反馈的增强型V/sup 2/控制。所有这三种方法都利用输出电压开关涟漪进行脉宽调制（PWM），因此统称为基于纹波的控制。Krylov-Bogoliubov-Mitropolsky涟漪估计技术的基础上的一般建模方法，适用于开发平均模型的单通道以及多通道降压转换器采用每种控制方法。与现有的模型，仅限于小信号操作，所提出的模型是有效的大信号操作，并能够预测分谐波不稳定性，而不包括任何采样和保持块中使用的以前的模型。本文还表明，在输出端添加并联的高质量陶瓷电容（在以前的模型中被忽略）可能会导致脉冲跳跃和涟漪不稳定，并提出了一种基于适当选择陶瓷电容和/或PWM斜坡补偿的解决方案。模型进一步应用于分析和比较的涟漪稳定性，有效负载电流前馈增益，和输出阻抗的三种控制方法的性能。
Three recently developed control methods for voltage regulator modules, namely, V/sup 2/ control, enhanced V/sup 2/ control, and enhanced V/sup 2/ control without output voltage dynamic feedback, are analyzed and compared in this paper. All three methods utilize the output voltage switching ripple for pulse-width modulation (PWM), hence, are collectively referred to as ripple-based control. A general modeling method based on the Krylov-Bogoliubov-Mitropolsky ripple estimation technique is applied to develop averaged models for single-channel as well as multichannel buck converters employing each of the control methods. Unlike existing models that are limited to small-signal operation, the proposed models are valid for large-signal operation and are capable of predicting subharmonic instability without including any sample-and-hold block as used in previous models. The paper also shows that adding parallel, high-quality ceramic capacitors at the output, which are ignored in previous models, can lead to pulse skipping and ripple instability, and a solution based on proper selection of the ceramic capacitors and/or ramp compensation at the PWM is presented. The models are further applied to analyze and compare the performance of the three control methods in terms of ripple stability, effective load current feedforward gain, and output impedance.