摘要
并联电感同步开关(P-SSHI)电路可有效提高压电能量俘获能力,但其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。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,以降低整流电路的导通压降。自适应P-SSHI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,以提高开关控制的精准性。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。在负载电阻100 kΩ的情况下,所提电路的输出功率为291.35μW,相比于全桥整流电路的125.32μW,提高了132%。
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.The control signals of adaptive P-SSHI 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.In the case of load resistance of100kΩ,the output power of the proposed circuit is291.35μW,and output power of the full-bridge rectifier is125.32μW.The output power increase132%.
作者
周兴
叶益迭
夏桦康
施阁
ZHOU Xing;YE Yidie;XIA Huakang;SHI Ge(Faculty of Electrical Engineering and Computer Science,Ningbo University,Ningbo Zhejiang 315211,China)
出处
《传感技术学报》
CAS
CSCD
北大核心
2018年第12期1815-1821,共7页
Chinese Journal of Sensors and Actuators
基金
国家自然科学基金项目(61401243
61601429)
