A 400-to-12 V Fully Integrated Switched-Capacitor DC-DC Converter Achieving 119 mW/mm2 at 63.6 % Efficiency

Tuur Van Daele, F. Tavernier
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引用次数: 1

Abstract

High-voltage power sources, such as the mains (up to 240 VRMS) and high-voltage batteries in electric cars (e.g., 400 V), are omnipresent. In contrast, low-power applications like loT, smart homes, and control in electric vehicles need low supply voltages [1]. Bridging this voltage gap requires power converters with high input voltages and large conversion steps. Furthermore, complete integration of these converters enables significant cost reduction and makes the system more reliable and compact. Recent developments confirm this integration trend for large conversion steps, as bulky transformers in power modules are replaced by smaller and fewer external components [1], [2]. However, complete integration of their large off-chip inductors would suffer from a low quality factor, and for large conversions steps, these converters depend on very low duty cycles. The switched-capacitor converter (SCC) is a better candidate since it is easily integrated while operating at a 50 % duty cycle regardless of the conversion step. In addition, it is often used as the second stage in fully integrated AC-DC converters to improve performance [3]. However, state-of-the-art fully integrated SCCs only handle input voltages up to 42 V [3], [4]. In addition, they lack performance due to increased parasitics and component degradation at high voltages.
一种400- 12v全集成开关电容DC-DC变换器,实现119 mW/mm2,效率为63.6%
高压电源,如市电(高达240 VRMS)和电动汽车中的高压电池(例如,400 V),无处不在。相比之下,loT、智能家居和电动汽车控制等低功耗应用需要低电源电压[1]。弥合这种电压差距需要具有高输入电压和大转换步骤的功率转换器。此外,这些转换器的完全集成可以显著降低成本,使系统更加可靠和紧凑。最近的发展证实了这种大转换步骤的集成趋势,因为功率模块中笨重的变压器被更小、更少的外部组件所取代[1],[2]。然而,它们的大型片外电感的完全集成将受到低质量因数的影响,并且对于大转换步骤,这些转换器依赖于非常低的占空比。开关电容变换器(SCC)是一个更好的选择,因为它很容易集成,同时在50%的占空比下工作,无论转换步骤如何。此外,为了提高性能,它常被用作全集成AC-DC变换器的第二级[3]。然而,最先进的完全集成的SCCs只能处理高达42 V的输入电压[3],[4]。此外,由于高电压下寄生和元件退化的增加,它们缺乏性能。
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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