串联同步开关电感(Series Synchronous Switch Harvesting on Inductor,S-SSHI)电路输出功率高整流电压范围窄,而同步电荷提取(Synchronous Electric Charge Extraction,SECE)电路则输出功率低整流电压范围宽。提出了一种基于S-SSHI和S...串联同步开关电感(Series Synchronous Switch Harvesting on Inductor,S-SSHI)电路输出功率高整流电压范围窄,而同步电荷提取(Synchronous Electric Charge Extraction,SECE)电路则输出功率低整流电压范围宽。提出了一种基于S-SSHI和SECE混合的压电阵列能量俘获接口电路,以实现整流器峰值输出功率和最佳整流电压范围之间的平衡。所提出的电路去除了整流桥结构,而采用简单的无源峰值检测器设计,且可以在任意相位差(0~2π)下从多个压电换能器中提取能量。仿真和实验结果表明,所提出的电路具有较高的输出功率和较宽的整流电压范围,与多输入全桥整流器相比,最大输出功率提升了3.04倍。展开更多
The key to self-powered technique is initiative to harvest energy from the surrounding environment. Harvesting energy from an ambient vibration source utilizing piezoelectrics emerged as a popular method. Effi- cient ...The key to self-powered technique is initiative to harvest energy from the surrounding environment. Harvesting energy from an ambient vibration source utilizing piezoelectrics emerged as a popular method. Effi- cient interface circuits become the main limitations of existing energy harvesting techniques. In this paper, an inter- face circuit for piezoelectric energy harvesting is presented. An active full bridge rectifier is adopted to improve the power efficiency by reducing the conduction loss on the rectifying path. A parallel synchronized switch harvesting on inductor （P-SSHI） technique is used to improve the power extraction capability from piezoelectric harvester, thereby trying to reach the theoretical maximum output power. An intermittent power management unit （IPMU） and an output capacitor-less low drop regulator （LDO） are also introduced. Active diodes （AD） instead of tradition- al passive ones are used to reduce the voltage loss over the rectifier, which results in a good power efficiency. The IPMU with hysteresis comparator ensures the interface circuit has a large transient output power by limiting the output voltage ranges from 2.2 to 2 V. The design is fabricated in a SMIC 0.18/~m CMOS technology. Simulation results show that the flipping efficiency of the P-SSHI circuit is over 80% with an off-chip inductor value of 820/zH. The output power the proposed rectifier can obtain is 44.4/~W, which is 6.7x improvement compared to the maximum output power of a traditional rectifier. Both the active diodes and the P-SSHI help to improve the output power of the proposed rectifier. LDO outputs a voltage of 1.8 V with the maximum 90% power efficiency. The proposed P-SSHI rectifier interface circuit can be self-powered without the need for additional power supply.展开更多
文章根据并联同步开关电感收集(parallel synchronized switch harvesting on inductor,P-SSHI)技术,提出一种自供电的压电能量收集系统,实现了在低激励环境下的系统启动和电压输出功能,并基于压电材料分离电极理论设计冷启动电路。该...文章根据并联同步开关电感收集(parallel synchronized switch harvesting on inductor,P-SSHI)技术,提出一种自供电的压电能量收集系统,实现了在低激励环境下的系统启动和电压输出功能,并基于压电材料分离电极理论设计冷启动电路。该系统采用带有有源二极管的P-SSHI整流电路代替传统的整流结构,以减少整流过程的能量损耗,能够在动态范围内调节输出电压,实现多输出负载的功能。基于0.18μm CMOS工艺仿真结果表明,该系统的电压翻转效率达到85%,输出功率是采用传统整流电路的5.8倍,同时能够产生1.2、1.8 V 2种电压,用于不同负载供电。该自供电能量收集系统可用于解决物联网无线传感器网络节点的自供电问题。展开更多
为提高压电能量采集(piezoelectric energy harvesting,PEH)系统的转换效率,文章在传统全桥整流器(full-bridge rectifier,FBR)以及同步开关电感收集(synchronous switch harvesting on inductor,SSHI)技术的基础上,设计了冷启动同步开...为提高压电能量采集(piezoelectric energy harvesting,PEH)系统的转换效率,文章在传统全桥整流器(full-bridge rectifier,FBR)以及同步开关电感收集(synchronous switch harvesting on inductor,SSHI)技术的基础上,设计了冷启动同步开关电容收集(synchronous swich harvesting on capacitors,SsHC)整流器.整流器电路可在冷态下提供较高的开路电压,使系统加快进入正常工作状态.内部的开关电容(switched capacitors.SCs)代替电感进行电荷的快速翻转,降低了能量损耗并实现了较高的翻转效率。整流器电路采用TSMC0.18μm CMOS工艺进行搭建与仿真.效率计算结果显示,与传统的全桥整流器相比,在开路电压为4.5 V的情况下,压电能量收集系统的效率提高了5.5倍,超过了大多数SSHI整流器电路,并显著减小了系统面积.仿真结果显示,设计的四电容SSHC整流器的电压翻转效率为66.36%.展开更多
环境能量俘获中压电振动能量采集的接口电路设计已成为近几年研究的热点之一。串联同步开关电感(Series Synchronous Switch Harvesting on Inductor,S-SSHI)接口电路是一种常用的能量采集接口电路。只有当负载阻抗与压电元件(Piezoelec...环境能量俘获中压电振动能量采集的接口电路设计已成为近几年研究的热点之一。串联同步开关电感(Series Synchronous Switch Harvesting on Inductor,S-SSHI)接口电路是一种常用的能量采集接口电路。只有当负载阻抗与压电元件(Piezoelectric Energy,PZT)输出阻抗匹配时,才能获得最大能量转换效率。针对以上问题,提出了一种无分时开路电压法的最大功率跟踪(Fractional Normal-Operation Voltage Maximum Power Point Tracking,FNOV-MPPT)控制电路用于S-SSHI接口电路的最大功率跟踪,与传统的分时开路电压法相比,无需断开PZT与负载端的连接,在S-SSHI接口电路正常工作期间进行最大功率跟踪,其效率最高可达97%。采用的极值检测电路只用四个三极管和一个检测电容,降低了电路功耗。同时本文所提出的电路具有很好的扩展性,可以通过一个FNOV-MPPT控制电路的方式进行多PZT能量同时采集。展开更多
文摘串联同步开关电感(Series Synchronous Switch Harvesting on Inductor,S-SSHI)电路输出功率高整流电压范围窄,而同步电荷提取(Synchronous Electric Charge Extraction,SECE)电路则输出功率低整流电压范围宽。提出了一种基于S-SSHI和SECE混合的压电阵列能量俘获接口电路,以实现整流器峰值输出功率和最佳整流电压范围之间的平衡。所提出的电路去除了整流桥结构,而采用简单的无源峰值检测器设计,且可以在任意相位差(0~2π)下从多个压电换能器中提取能量。仿真和实验结果表明,所提出的电路具有较高的输出功率和较宽的整流电压范围,与多输入全桥整流器相比,最大输出功率提升了3.04倍。
基金Project supported by the National Natural Science Foundation of China(Nos.61574103,U1709218)the Key Research and Development Program of Shaanxi Province(No.2017ZDXM-GY-006)
文摘The key to self-powered technique is initiative to harvest energy from the surrounding environment. Harvesting energy from an ambient vibration source utilizing piezoelectrics emerged as a popular method. Effi- cient interface circuits become the main limitations of existing energy harvesting techniques. In this paper, an inter- face circuit for piezoelectric energy harvesting is presented. An active full bridge rectifier is adopted to improve the power efficiency by reducing the conduction loss on the rectifying path. A parallel synchronized switch harvesting on inductor （P-SSHI） technique is used to improve the power extraction capability from piezoelectric harvester, thereby trying to reach the theoretical maximum output power. An intermittent power management unit （IPMU） and an output capacitor-less low drop regulator （LDO） are also introduced. Active diodes （AD） instead of tradition- al passive ones are used to reduce the voltage loss over the rectifier, which results in a good power efficiency. The IPMU with hysteresis comparator ensures the interface circuit has a large transient output power by limiting the output voltage ranges from 2.2 to 2 V. The design is fabricated in a SMIC 0.18/~m CMOS technology. Simulation results show that the flipping efficiency of the P-SSHI circuit is over 80% with an off-chip inductor value of 820/zH. The output power the proposed rectifier can obtain is 44.4/~W, which is 6.7x improvement compared to the maximum output power of a traditional rectifier. Both the active diodes and the P-SSHI help to improve the output power of the proposed rectifier. LDO outputs a voltage of 1.8 V with the maximum 90% power efficiency. The proposed P-SSHI rectifier interface circuit can be self-powered without the need for additional power supply.
文摘文章根据并联同步开关电感收集(parallel synchronized switch harvesting on inductor,P-SSHI)技术,提出一种自供电的压电能量收集系统,实现了在低激励环境下的系统启动和电压输出功能,并基于压电材料分离电极理论设计冷启动电路。该系统采用带有有源二极管的P-SSHI整流电路代替传统的整流结构,以减少整流过程的能量损耗,能够在动态范围内调节输出电压,实现多输出负载的功能。基于0.18μm CMOS工艺仿真结果表明,该系统的电压翻转效率达到85%,输出功率是采用传统整流电路的5.8倍,同时能够产生1.2、1.8 V 2种电压,用于不同负载供电。该自供电能量收集系统可用于解决物联网无线传感器网络节点的自供电问题。
文摘为提高压电能量采集(piezoelectric energy harvesting,PEH)系统的转换效率,文章在传统全桥整流器(full-bridge rectifier,FBR)以及同步开关电感收集(synchronous switch harvesting on inductor,SSHI)技术的基础上,设计了冷启动同步开关电容收集(synchronous swich harvesting on capacitors,SsHC)整流器.整流器电路可在冷态下提供较高的开路电压,使系统加快进入正常工作状态.内部的开关电容(switched capacitors.SCs)代替电感进行电荷的快速翻转,降低了能量损耗并实现了较高的翻转效率。整流器电路采用TSMC0.18μm CMOS工艺进行搭建与仿真.效率计算结果显示,与传统的全桥整流器相比,在开路电压为4.5 V的情况下,压电能量收集系统的效率提高了5.5倍,超过了大多数SSHI整流器电路,并显著减小了系统面积.仿真结果显示,设计的四电容SSHC整流器的电压翻转效率为66.36%.
文摘环境能量俘获中压电振动能量采集的接口电路设计已成为近几年研究的热点之一。串联同步开关电感(Series Synchronous Switch Harvesting on Inductor,S-SSHI)接口电路是一种常用的能量采集接口电路。只有当负载阻抗与压电元件(Piezoelectric Energy,PZT)输出阻抗匹配时,才能获得最大能量转换效率。针对以上问题,提出了一种无分时开路电压法的最大功率跟踪(Fractional Normal-Operation Voltage Maximum Power Point Tracking,FNOV-MPPT)控制电路用于S-SSHI接口电路的最大功率跟踪,与传统的分时开路电压法相比,无需断开PZT与负载端的连接,在S-SSHI接口电路正常工作期间进行最大功率跟踪,其效率最高可达97%。采用的极值检测电路只用四个三极管和一个检测电容,降低了电路功耗。同时本文所提出的电路具有很好的扩展性,可以通过一个FNOV-MPPT控制电路的方式进行多PZT能量同时采集。
