Low-power low-voltage AC-DC converters for electromagnetic energy harvesting with efficient indirect feedback scheme
Low-power low-voltage AC-DC converters for electromagnetic energy harvesting with efficient indirect feedback scheme
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DOI：
10.1049/iet-pel.2012.0109
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发表时间：
2012-11
影响因子：
2
通讯作者：
Dayal Rohan;L. Persa
中科院分区：
文献类型：
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作者：
Dayal Rohan;L. Persa
本研究提出了两种用于低压电磁能量收集的单级交流-直流变换器。转换器的设计目的是将非常低的交流电压（数百毫伏）提升到高直流电压（3.3 V DC）。这种系统的成功运行取决于控制和驱动电路的适当开发。转换器也需要根据相关的微型发电机进行适当的设计。文中还详细讨论了变换器关键部件的设计和选用。低功率驱动电路用于实现自我维持系统。与DC-DC转换器不同，直接AC-DC转换器通常没有公共接地。这样的结构使得反馈和控制的实现变得困难。为了解决这一问题，提出了一种新的间接反馈策略。其思想是获得参考系统接地的输出电压信息。反馈电路实现起来非常简单，功耗也很低。辅助电源也被设计为栅极驱动器提供电源。结果表明，间接反馈策略对负荷变化同样有效。仿真和实验结果验证了收集系统的自持续高效运行。
In this study, two single-stage AC-DC converters for low-voltage electromagnetic energy harvesting are presented. The converters are designed to boost very low AC voltage (hundreds of millivolts) to a high DC voltage (3.3 V DC). The successful operation of such systems depends on proper development of control and driver circuits. The converters also need to be designed in proper accordance with the associated microgenerator. Detailed discussion on the design and selection of critical components of the converter is also presented. Low-power driver circuits are used to enable a self-sustaining system. Unlike DC-DC converters, direct AC-DC converters generally do not have a common ground. Such a structure makes implementation of feedback and control difficult. A novel indirect feedback strategy is proposed to solve this problem. The idea is to obtain the output voltage information referenced to the system ground. The feedback circuit is very simple to implement and consumes very low power. An auxiliary supply has also been designed to provide power to the gate drivers. It is shown that the indirect feedback strategy also works for load variations. Both simulation and experimental results with a suitable microgenerator are presented to verify the self-sustainable efficient operation of the harvesting systems.