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中文摘要: 并联电感同步开关（P-SSHI）电路可以提高压电能量俘获能力，但其能量俘获效率受到开关控制精准性、整流电路导通压降等因素的影响。因此，本文提出了一种将超低压降有源整流与自适应P-SSHI结构相结合的高效压电能量俘获电路。其中，超低压降有源整流的上半桥采用交叉耦合被动开关的PMOS对管结构，下半桥则采用有源电路控制开关的NMOS对管结构，从而有效地降低了整流电路的导通压降。为进一步提高电路的压电俘获效率，本文采用自适应同步开关控制的P-SSHI结构以提高开关控制的精准性。该结构通过对整流电路中的电流进行过零检测确定同步开关的闭合时刻，对L-C振荡回路中的电流进行过零检测确定同步开关的断开时刻。实验结果表明，所提电路可以实现同步开关的自适应控制，并可有效提高压电能量俘获电路的整体效率。与全桥整流电路相比，本文所提电路可将输出功率提高到235%。
Abstract:The circuit with parallel synchronized switching harvesting on inductor (P-SSHI) improves piezoelectric energy harvesting capability. However, the efficiency is related to many factors such as the precision of the switching control in P-SSHI and the voltage drop of rectifier. Therefore, an efficient piezoelectric energy harvesting circuit base on ultra-low voltage drop active rectifier with adaptive P-SSHI is proposed. The active rectifier is consisted of a cross-coupled pair of PMOS transistors and a pair of active controlled NMOS transistors, which reducing the conduction voltage drop of the rectifier effectively. In order to further improve the efficiency of the piezoelectric energy harvesting system, the adaptive P-SSHI is adopted to achieve more precise control. The control signals are from the zero current detection in rectifier and the zero current detection in L-C resonant circuit, which turns on and off the switch transistor in P-SSHI respective. The experimental results show that the adaptive control of the synchronous switch in P-SSHI is implemented, and the overall efficiency of the piezoelectric energy harvesting circuit is improved. The output power of the proposed circuit is increased to 235% compared with a full-bridge rectifier circuit.
文章编号：cg18000506 中图分类号： 文献标志码：
基金项目:国家自然科学基金项目
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