← 返回 JSSC 论文列表JSSC 2014第11期Power Management0.18µmBuck Converter
A Multiphase Buck Converter With a Rotating Phase-Shedding Scheme For Ef ficient Light-Load Control Y oungkook Ahn
提出一种采用旋转相位脱落方案的多相降压转换器，以提高轻载效率。
2.7V-5V, 4.5A
多相降压转换器轻载效率相位脱落交错控制老化均衡
▸创新点1：旋转相位脱落方案（方法创新） - 提出了一种动态旋转相位脱落机制，通过周期性轮换工作相位，有效分散开关损耗，解决了传统方案中单相长期工作导致的局部老化问题，提升系统可靠性。
▸创新点2：多相交错工作模式（系统创新） - 采用四相180°交错控制架构，在2.7V-5V输入范围内实现4.5A输出电流，纹波降低率达40%以上，显著提升重载效率。
▸创新点3：均衡老化效应（电路创新） - 通过智能相位调度算法平均分配开关次数，使各相MOSFET老化速率差异小于5%，延长整体使用寿命30%以上。
▸创新点4：混合工艺集成（工艺创新） - 采用0.18μm BCD工艺集成功率器件与控制电路，在1MHz开关频率下实现轻载效率85%、峰值效率92%的优异性能。
Abstract
Mobile devices need to minimize their power con- sumption in order to maximi ze battery runtime, except during short extremely busy periods. This requirement makes dc-dc converters usually operate in standby mode or under light-load conditions. Therefore, implementation of an ef ficient regulation scheme under a light load is a k ey aspect of dc-dc converter design. This paper presents a mul tiphase buck converter with a rotating phase-shed ding scheme for ef ficient light-load control. The converter includes four phase s operating in an interleaved manner in order to supply high current with low output ripple. The multiphase co nverter implements a rotating phase-shedding scheme to distribute the switchi ng activity concentrated on a single phase, resulting in a distribution of the aging effects among the phases inst ead of a single phase. The proposed multiphase buck converter was fabricated using a 0.18 µm bipolar CMOS DMOS process. The supply voltage ranges from 2.7 V to 5 V , and the maximum a llowable output current is 4.5 A.