Digitally Assisted Quasi-V2 Hysteretic Buck Converter with Fixed Frequency and without Using Large-ESR Capacitor

📋 论文概要

该论文提出了一种数字辅助的准V2滞环降压转换器，实现了固定频率操作且无需使用大ESR电容。解决了传统滞环控制频率不固定和依赖大ESR电容的问题，提升了瞬态响应和稳定性。

💡 主要创新点

• 提出准V2控制架构，结合数字辅助实现固定频率操作，避免传统滞环控制的频率变化问题。
• 无需大ESR电容即可实现稳定控制，降低了对电容的依赖和成本。
• 通过数字电路补偿环路延迟和参数变化，增强了系统鲁棒性。

🏷 关键词

📄 原文摘要

The rapid advancement of processor technology has posed stringent challenges on power supply design. For high efficiency, switching converters are used. Frequent load switching requires the converters to have fast load transient response with recovery times in the order of µs, and therefore the switching frequency in the MHz range [1]. The transient overshoot and undershoot voltages must be within 10% of the output voltage, and such specifications are difficult to meet for a processor core voltage of 0.8V. For fast load transient, inductor current should be fed forward to the PWM generator, which needs a high performance integrated current sensor. In the output feedforward (or V2) converter, inductor current is sensed by the equivalent series resistor (ESR) of the output capacitor instead. The generic implementation of a V2 buck converter is shown in Fig. 26.3.1 [2,3]. The output voltage, Vo, is fed

👥 作者与机构

Feng Su, Wing-Hung Ki

Hong Kong University of Science and Technology, Hong Kong, China