Digitally-controlled H-bridge DC-DC converter for micropower PV energy harvesting system

2016 International Symposium on Integrated Circuits (ISIC) Pub Date : 2016-12-01 DOI:10.1109/ISICIR.2016.7829681

A. Bui, Zhekai Xiao, L. Siek

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引用次数: 8

Abstract

This paper presents a micro-power photovoltaic (PV) harvesting system. A H-bridge configuration DC-DC converter is designed to harvest PV energy and deliver energy to applications of Internet of Thing (IOT). The main converter consists of a single inductor with two inputs and two outputs. It regulates a constant 1V output voltage for several applications such as sensors and signal transmitters. The surplus energy is stored in a rechargeable battery. The battery also serves as a secondary input source to provide energy to the output load in heavy-load condition. Due to the limited energy of the system, the power consumption of the power system is optimized by several techniques. A perturb-and-observe maximum power point tracker (MPPT) is implemented to maximize the power extracted from the PV harvester. Pulse-width modulation (PWM) and pulse-frequency modulation (PFM) are used to regulate the output voltage. The controller is designed mainly in digital and free of power-hungry circuits. The proposed converter occupies an area of 1.44mm2. The estimated peak power efficiency is 84% while driving 3–10µA load current.

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用于微功率光伏能量收集系统的数字控制h桥DC-DC变换器

介绍了一种微功率光伏(PV)采集系统。设计了h桥结构DC-DC转换器，用于收集光伏能量并将能量传输到物联网(IOT)应用中。主变换器由具有两个输入和两个输出的单个电感器组成。它为传感器和信号发射器等几种应用调节恒定的1V输出电压。多余的能量储存在可充电电池中。电池也可以作为二次输入源，在重载条件下为输出负载提供能量。由于系统能量有限，采用多种技术对电力系统的功耗进行优化。实现了扰动观测最大功率点跟踪器(MPPT)，以最大限度地从光伏采集器中提取功率。脉宽调制(PWM)和脉频调制(PFM)用于调节输出电压。该控制器主要采用数字设计，没有耗电电路。该转换器占地面积为1.44mm2。在驱动3-10µA负载电流时，估计峰值功率效率为84%。

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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2016 International Symposium on Integrated Circuits (ISIC)

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