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首页> 外文期刊>IEEE transactions on circuits and systems . I , Regular papers >A MPPT Circuit With 25 μW Power Consumption and 99.7% Tracking Efficiency for PV Systems
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A MPPT Circuit With 25 μW Power Consumption and 99.7% Tracking Efficiency for PV Systems

机译：用于光伏系统的MPPT电路，功耗为25μW，跟踪效率为99.7％

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摘要

A Maximum Power Point Tracking (MPPT) circuit for a 0.7-W photovoltaic (PV) system is proposed. The circuit employs a modified hill-climbing algorithm based on a 3-points comparison instead of the traditional 2-points comparison. The adopted algorithm simplifies the detection of the Maximum Power Point (MPP) and enables the implementation of a periodic sleep-mode to reduce the overall power consumption without compromising effective tracking of irradiance variations. Moreover, to achieve high MPP tracking efficiency, a low-power linear analog multiplier is implemented to accurately compute the instantaneous power of the PV source from its sensed voltage and current levels. This power-metering function is realized in the analog domain to eliminate the need for data converters and to minimize the MPPT circuit's power consumption. A complete design of the proposed circuit is implemented in 0.18- μm BiCMOS process in less than 1.55 mm 2 and consumes less than 25 μW with the digital core running at 500 kHz and a measured peak MPP tracking efficiency of 99.7%.
机译：提出了一种用于0.7 W光伏（PV）系统的最大功率点跟踪（MPPT）电路。该电路采用基于三点比较的改进爬坡算法，而不是传统的两点比较。所采用的算法简化了最大功率点（MPP）的检测，并实现了周期性的睡眠模式，从而降低了总功耗，同时又不影响对辐照度变化的有效跟踪。此外，为了实现高MPP跟踪效率，实施了低功耗线性模拟乘法器，以根据其感测到的电压和电流水平准确计算PV电源的瞬时功率。该功率计量功能在模拟域中实现，从而消除了对数据转换器的需求，并最大程度地降低了MPPT电路的功耗。拟议电路的完整设计在小于1.55 mm 2的0.18μmBiCMOS工艺中实现，功耗小于25μW，数字核的工作频率为500 kHz，测得的峰值MPP跟踪效率为99.7％。

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