Hybrid switched-capacitor (SC) dc–dc converters show promise in applications that require high conversion ratios and small physical size. However, the problem of flying capacitor voltage imbalance, especially during transients, remains a major challenge that limits the adoption of such converters. This article presents a highly integrated hybrid switched-capacitor (SC) converter for universal serial bus (USB) powered applications, featuring fast balancing dynamics. The topology consists of two cascaded stages to increase the conversion ratio. The output voltage regulation and flying capacitor active balance are both achieved by modified ripple injection control (MRIC), with an additional phase skipping technique further improving the transient response during startup. Fabricated in 0.18 μm\mu \text{m} complementary metal-oxide-semiconductor (CMOS) technology, the converter prototype has a peak efficiency of 96.9% for 5:1.2 V conversion. Safe startup can be achieved with the input voltage rising from 0 to 5 V within 8 μs\mu \text{s} (0.62 V/ μs\mu \text{s} slew rate).

中文翻译：

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一种能够快速自启动用于 USB 供电的级联混合开关电容 DC-C 转换器


混合开关电容器 (SC) DC-DC 转换器在需要高转换比和小物理尺寸的应用中显示出前景。然而，飞跨电容器电压不平衡问题，尤其是瞬态期间，仍然是限制此类转换器采用的主要挑战。本文介绍了一种适用于通用串行总线 (USB) 供电应用的高度集成混合开关电容器 (SC) 转换器，具有快速平衡动态特性。该拓扑由两个级联级组成，以提高转换比。输出电压调节和飞跨电容器主动平衡均通过改进的纹波注入控制 (MRIC) 实现，并采用额外的跳相技术进一步改善启动期间的瞬态响应。该转换器原型采用 0.18 μm\mu \text{m} 互补金属氧化物半导体 (CMOS) 技术制造，5:1.2 V 转换的峰值效率为 96.9%。输入电压在 8 μs\mu \text{s}（0.62 V/ μs\mu \text{s} 压摆率）内从 0 V 上升到 5 V 即可实现安全启动。