An Ultra-low Power Automated Maximum Power Point Tracking Circuit with 99.9% Tracking Efficiency
An Ultra-low Power Automated Maximum Power Point Tracking Circuit with 99.9% Tracking Efficiency
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DOI：
10.1109/iscas46773.2023.10181935
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发表时间：
2023-05
期刊：
影响因子：
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通讯作者：
M. Abedi;A. Shrivastava
中科院分区：
文献类型：
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作者：
M. Abedi;A. Shrivastava
本文提出了一种适用于直流能量采集器的DC-DC变换器最大功率点跟踪电路。为了在输入功率不变化的情况下节省跟踪电路的功率，在MPPT电路中还提出了功率变化检测器（PCD）电路。使用PCD，可以检测输入功率的变化，从而激活MPPT电路进行跟踪。当实现MPP时，所提出的逻辑关闭与MPP相关的电路以节省功率。在跟踪算法中采用了一种改进的爬坡（HC）技术来解决速度/精度的权衡问题。MPPT电路采用基于感应和采样电感峰值电流的功率估计方法，实现了较高的跟踪效率。该MPPT系统采用65nm CMOS技术设计。仿真结果表明，在无工作点振荡的情况下，系统的峰值跟踪效率可达99.9%。该MPPT电路的功耗为125nW。
This paper presents a maximum power point tracking (MPPT) circuit for DC-DC converters which is well suited for DC energy harvesters. To save the power of the tracking circuit when there is no variation in the input power, a power change detector (PCD) circuit is also proposed in the MPPT circuit. With PCD, changes in the input power are detected, thereby activating the MPPT circuitry for tracking. When MPP is achieved, the proposed logic shuts down the MPPT-related circuits to save power. A modified hill-climbing (HC) technique is implemented for the tracking algorithm to address the speed/precision tradeoff. The MPPT circuit uses a power estimation method based on sensing and sampling of the inductor peak current, achieving a high tracking efficiency. The proposed MPPT system is designed in 65nm CMOS technology. Simulation shows a peak tracking efficiency (TE) of 99.9% is achieved without oscillation of the operating point. The power consumption of the proposed MPPT circuit is 125nW.