A 2MHz 4-48V $\mathrm{V}_{\text{IN}}$ Flying-Capacitor Based Floating-Ground GaN DC-DC Converter with Real-Time Inductor Peak-Current Detection and $6\mu \mathrm{s}$ Load Transient Response

2022 IEEE Radio Frequency Integrated Circuits Symposium (RFIC) Pub Date : 2022-06-19 DOI:10.1109/RFIC54546.2022.9863089

Weizhong Chen, Chang Yang, Lei Chen, P. Gui

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Abstract

This paper presents a 2MHz 4V-to-48V VIN, GaN-based buck-boost converter with optimized buck-boost mode, enhanced safe protection, and fast transient response for automotive Advanced Driving Assistant Systems (ADAS). A flying-capacitor-based floating-ground topology is proposed first time to solve the issue associated with extremely short on time, improve power efficiency in the buck-boost region and provide real-time detection and management of the inductor peak current. This floating-ground technique helps alleviate the problem of efficiency drop in the four-switch buck-boost topology and ensures converter/load safety. An indirect current sensor is also proposed, which allows for sensing the inductor current change in the buck-boost mode without using any bulky sensing resistors and achieves $k$ fast transient response with 100mv-undershoot/80mV-overshoot for 1A load current change. This converter achieves a maximum efficiency of 92% which is comparable to the state-of-the-art buck-boost schemes

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一种2MHz 4-48V $\ mathm {V}_{\text{IN}}$基于飞电容的浮地GaN DC-DC变换器，具有实时电感峰值电流检测和$6\ \ mathm {s}$负载瞬态响应

本文提出了一种2MHz 4v - 48v VIN，基于gan的buck-boost转换器，具有优化的buck-boost模式，增强的安全保护和快速的瞬态响应，适用于汽车高级驾驶辅助系统(ADAS)。首次提出了一种基于飞电容的浮地拓扑结构，解决了瞬时极短的问题，提高了升压区域的功率效率，并提供了对电感峰值电流的实时检测和管理。这种浮地技术有助于缓解四开关降压升压拓扑中的效率下降问题，并确保变换器/负载的安全。还提出了一种间接电流传感器，该传感器允许在降压-升压模式下感应电感电流变化，而无需使用任何笨重的感应电阻，并在1A负载电流变化时实现100mv-过调/ 80mv -过调的快速瞬态响应。该转换器达到92%的最高效率，可与最先进的buck-boost方案相媲美

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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2022 IEEE Radio Frequency Integrated Circuits Symposium (RFIC)

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