Efficient direct ac-to-dc converters for vibration-based low voltage energy harvesting
Efficient direct ac-to-dc converters for vibration-based low voltage energy harvesting
复制标题
用于基于振动的低压能量收集的高效直接交流/直流转换器
DOI：
10.1109/iecon.2008.4758319
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
K. Salama
中科院分区：
文献类型：
--
作者：
S. Dwari;R. Dayal;L. Parsa;K. Salama
本文提出了两种直接交流到直流电力电子转换器拓扑结构，以有效和最佳的能量收集从低压微型发电机。用于此类应用的传统电力电子转换器具有两级，前端的二极管桥式整流器，后面是DC-DC升压转换器。然而，电磁微型发电机的极低输出电压不允许二极管桥式整流。即使可能，前端二极管桥中的损耗也使得传统的电力电子接口效率相当低。所提出的单级转换器直接将微型发电机的低交流电压提升到可用的直流电压电平，从而实现更高的效率。利用MOSFET的双向电流传导能力实现单级AC到DC功率转换。此外，对于最佳能量收集，功率转换器应该能够控制负载电阻，如微型发电机所见。传统的转换器不利于这种控制。与建议的转换器拓扑结构的最佳能量收集可以成功地实现。
In this paper two direct ac-to-dc power electronics converter topologies are proposed for efficient and optimum energy harvesting from low voltage microgenerators. The conventional power electronics converters used for such applications have two stages, a diode bridge rectifier at the front end followed by a dc-dc boost converter. However, the extremely low output voltage of electromagnetic microgenerators does not allow diode bridge rectification. Even if possible, the losses in the front end diode bridge make the conventional power electronic interfaces quite inefficient. The proposed single stage converters directly boost the microgenerator low ac voltage to usable dc voltage level, and hence, achieve higher efficiency. The single stage ac-to-dc power conversion is achieved by utilizing the bidirectional current conduction capability of MOSFETs. Moreover, for optimum energy harvesting the power converter should be able to control the load resistance as seen by a microgenerator. The conventional converters are not conducive for such control. With the proposed converter topologies the optimal energy harvesting can be successfully realized.