A rectifier circuit for wireless energy harvesting(WEH) with a wide input power range is proposed in this paper. We build up accurate models of the diodes to improve the accuracy of the design of the rectifier. Due to...A rectifier circuit for wireless energy harvesting(WEH) with a wide input power range is proposed in this paper. We build up accurate models of the diodes to improve the accuracy of the design of the rectifier. Due to the nonlinear characteristics of the diodes, a new band-stop structure is introduced to reduce the imaginary part impedance and suppress harmonics. A novel structure with double branches and an optimized λ/4 microstrip line is proposed to realize the power division ratio adjustment by the input power automatically. The proposed two branches can satisfy the two cases with input power of-20 dBm to 0 dBm and 0 dBm to 15 dBm, respectively. Here, dBm = 10 log(P mW), and P represents power. An impedance compression network(ICN) is correspondingly designed to maintain the input impedance stability over the wide input power range. A rectifier that works at 2.45 GHz is implemented. The measured results show that the highest efficiency can reach 51.5% at the output power of 0 dBm and higher than 40% at the input power of-5 dBm to 12 dBm.展开更多
This paper presents a new current conveyor (CCII+) full-wave rectifier for low frequency/small signal medical applications. The proposed rectifier is based on the current conveyor full-wave rectifier proposed previous...This paper presents a new current conveyor (CCII+) full-wave rectifier for low frequency/small signal medical applications. The proposed rectifier is based on the current conveyor full-wave rectifier proposed previously, but the proposed rectifier is better in view of no need diodes to rectify, and no need bias sources to overcome the zero crossing error. It needs only two CCII+s, two resistors, and three simple current mirrors, which is easy for IC implementation and for building in many countries. The PSPICE simulation with the current conveyor CCII+ in the current feedback opamp AD844 IC and the 2N2222 bipolar current mirror shows the good low frequency/small signal rectification, the operation voltage of down to 6 .展开更多
A new precision full-wave rectifier employing only two differential difference current conveyors, which is very suitable for CMOS technology implementation, is presented. The proposed rectifier is the voltage-mode cir...A new precision full-wave rectifier employing only two differential difference current conveyors, which is very suitable for CMOS technology implementation, is presented. The proposed rectifier is the voltage-mode circuit, which offers high-input and low-output impedance hence it can be directly connected to load without using any buffer circuits. PSPICE is used to verify the circuit performance. Simulated rectifier results based-on a 0.5 μm CMOS technology with ±2.5 V supply voltage demonstrates high precision rectification and excellent temperature stability. In addition, the application of proposed rectifier to pseudo RMS-to-DC conversion is also introduced.展开更多
针对压电能量收集中基于传统开路电压法的最大功率点追踪(Maximum Power Point Tracking,MPPT)存在的开路电压(VOC)高,导致有效输入电压范围受限这一问题,提出了一种单周期直接MPPT算法。该算法采用双采样电容两步采样技术,即在两个连...针对压电能量收集中基于传统开路电压法的最大功率点追踪(Maximum Power Point Tracking,MPPT)存在的开路电压(VOC)高,导致有效输入电压范围受限这一问题,提出了一种单周期直接MPPT算法。该算法采用双采样电容两步采样技术,即在两个连续周期内,两次将整流器从输出大电容上断开,并连接到电容值不同且略大于压电源寄生电容的采样电容上,每次半个周期,从而获得两个不同的采样电压。在此基础上,通过建立两次采样电压与最大功率点电压(VMPP)之间的数学模型,拟合出便于电路实现的计算公式,进而求解出VMPP。该算法不仅可以最大化的减小VMPP计算过程中的能量损失,同时还避免了VOC的产生,使得压电能量收集系统的最大输入电压可达CMOS器件的极限工作电压。采用标准0.18μm CMOS工艺完成了压电能量收集芯片的设计。后仿真结果表明:所提出的算法能够实时监测压电源的状态。在压电源发生变化时,仅需一个压电源振动周期即可自适应追踪到新的VMPP,追踪速度快且追踪精度高。当压电源功率在20μW~5 mW范围内变化时,VMPP计算精度达到93%,MPPT精度可达99%以上。展开更多
目的针对电力开关柜内温湿度、压力测量传感器供电问题,需要一种能让无线传感节点实现自供电的技术。基于射频能量收集(Radio frequency energy harvesting,RFEH)的无线自供能系统已被证明是更有效的解决方案。方法本文设计一种宽输入...目的针对电力开关柜内温湿度、压力测量传感器供电问题,需要一种能让无线传感节点实现自供电的技术。基于射频能量收集(Radio frequency energy harvesting,RFEH)的无线自供能系统已被证明是更有效的解决方案。方法本文设计一种宽输入功率范围高效率的整流器,可应用于低功率的无线传感系统。采用谐波抑制网络对二次三次谐波进行了一定控制,以及设计了π型匹配网络,提升了整体的效率。基于此整流器设计了适用于无源无线传感系统的RFEH系统。结果通过仿真与测试对整流电路的性能进行验证,结果表明设计出的整流器在−7.5~15 dBm输入功率范围内能量收集效率均大于50%,9 dBm时达到最高的转换效率71.6%,在−14 dBm时仍有30%的转换效率可用于低功率的物联网应用。最后,基于此RFEH系统搭建了温湿度及压力无源传感系统,实验结果显示该系统可在2 m处实时监测温湿度及压力。结论本文所设计的系统对低功率的物联网应用如无线传感系统具有重要意义。展开更多
为了提高压电振动能量采集器的转换输出效率,提出了一种新型自供电的去整流桥同步电感开关(Self-Powered and Rectifier-Free Synchronized Switching and Discharging to a storage Capacitor through an Inductor,RF-SSDCI)功率提取...为了提高压电振动能量采集器的转换输出效率,提出了一种新型自供电的去整流桥同步电感开关(Self-Powered and Rectifier-Free Synchronized Switching and Discharging to a storage Capacitor through an Inductor,RF-SSDCI)功率提取接口电路。电路由电容与三极管组成的自供电开关模块和由电感电容串联组成的功率提取模块组成。由于省去了传统的二极管整流桥结构,电路更有利于小型化与集成化。另外,电感电容串联组成的功率提取模块保证电感为储能电容充能时无需开关控制,降低了开关导通时间对电路功率提取的影响,从而减少了功率损耗。利用电路分析理论详细阐述了电路的工作原理和提取输出功率,仿真和实验结果验证了RF-SSDCI电路的有效性。RF-SSDCI的最大提取功率达到63.6μW,比SEH(Standard Energy Harvesting)电路和SP-OSCE(Self-Powered Optimized Synchronous Charge Extraction Circuit)电路提高近109.2%和135.5%。展开更多
磁场能量收集是能源互联网中无线传感器供电的有效方法。磁场能量收集器(magnetic field energy harvester,MFEH)需要配合串联匹配电容、整流桥和DC-DC变换器以实现能量的最大功率提取与传输。然而,由MFEH与匹配电容和整流桥构成的高阶...磁场能量收集是能源互联网中无线传感器供电的有效方法。磁场能量收集器(magnetic field energy harvester,MFEH)需要配合串联匹配电容、整流桥和DC-DC变换器以实现能量的最大功率提取与传输。然而,由MFEH与匹配电容和整流桥构成的高阶非线性电路无法采用低阶简化模型对其输出特性展开分析。因匹配电容与等效电感谐振,整流桥的开路电压可能超过MFEH的交流开路电压峰值,不能简单地将MFEH的交流开路电压峰值视为整流桥的开路电压。为此,文中采用相量法和高斯-赛德尔迭代法建立高阶非线性整流桥的稳态最佳输出电压的精准模型;采用四阶-五阶龙格库塔自适应方法提取整流桥的暂态开路输出特性,实现非侵入式磁场能量收集的自供电的低功耗开路电压法最大功率跟踪方案。该研究可为磁场能量收集系统最大功率点的确定和开路电压法中参数的设定提供理论支撑。展开更多
基金Key Laboratory of Chinese Academy of Sciences Foundation,China(No. 20190918)。
文摘A rectifier circuit for wireless energy harvesting(WEH) with a wide input power range is proposed in this paper. We build up accurate models of the diodes to improve the accuracy of the design of the rectifier. Due to the nonlinear characteristics of the diodes, a new band-stop structure is introduced to reduce the imaginary part impedance and suppress harmonics. A novel structure with double branches and an optimized λ/4 microstrip line is proposed to realize the power division ratio adjustment by the input power automatically. The proposed two branches can satisfy the two cases with input power of-20 dBm to 0 dBm and 0 dBm to 15 dBm, respectively. Here, dBm = 10 log(P mW), and P represents power. An impedance compression network(ICN) is correspondingly designed to maintain the input impedance stability over the wide input power range. A rectifier that works at 2.45 GHz is implemented. The measured results show that the highest efficiency can reach 51.5% at the output power of 0 dBm and higher than 40% at the input power of-5 dBm to 12 dBm.
文摘This paper presents a new current conveyor (CCII+) full-wave rectifier for low frequency/small signal medical applications. The proposed rectifier is based on the current conveyor full-wave rectifier proposed previously, but the proposed rectifier is better in view of no need diodes to rectify, and no need bias sources to overcome the zero crossing error. It needs only two CCII+s, two resistors, and three simple current mirrors, which is easy for IC implementation and for building in many countries. The PSPICE simulation with the current conveyor CCII+ in the current feedback opamp AD844 IC and the 2N2222 bipolar current mirror shows the good low frequency/small signal rectification, the operation voltage of down to 6 .
文摘A new precision full-wave rectifier employing only two differential difference current conveyors, which is very suitable for CMOS technology implementation, is presented. The proposed rectifier is the voltage-mode circuit, which offers high-input and low-output impedance hence it can be directly connected to load without using any buffer circuits. PSPICE is used to verify the circuit performance. Simulated rectifier results based-on a 0.5 μm CMOS technology with ±2.5 V supply voltage demonstrates high precision rectification and excellent temperature stability. In addition, the application of proposed rectifier to pseudo RMS-to-DC conversion is also introduced.
文摘针对压电能量收集中基于传统开路电压法的最大功率点追踪(Maximum Power Point Tracking,MPPT)存在的开路电压(VOC)高,导致有效输入电压范围受限这一问题,提出了一种单周期直接MPPT算法。该算法采用双采样电容两步采样技术,即在两个连续周期内,两次将整流器从输出大电容上断开,并连接到电容值不同且略大于压电源寄生电容的采样电容上,每次半个周期,从而获得两个不同的采样电压。在此基础上,通过建立两次采样电压与最大功率点电压(VMPP)之间的数学模型,拟合出便于电路实现的计算公式,进而求解出VMPP。该算法不仅可以最大化的减小VMPP计算过程中的能量损失,同时还避免了VOC的产生,使得压电能量收集系统的最大输入电压可达CMOS器件的极限工作电压。采用标准0.18μm CMOS工艺完成了压电能量收集芯片的设计。后仿真结果表明:所提出的算法能够实时监测压电源的状态。在压电源发生变化时,仅需一个压电源振动周期即可自适应追踪到新的VMPP,追踪速度快且追踪精度高。当压电源功率在20μW~5 mW范围内变化时,VMPP计算精度达到93%,MPPT精度可达99%以上。
文摘目的针对电力开关柜内温湿度、压力测量传感器供电问题,需要一种能让无线传感节点实现自供电的技术。基于射频能量收集(Radio frequency energy harvesting,RFEH)的无线自供能系统已被证明是更有效的解决方案。方法本文设计一种宽输入功率范围高效率的整流器,可应用于低功率的无线传感系统。采用谐波抑制网络对二次三次谐波进行了一定控制,以及设计了π型匹配网络,提升了整体的效率。基于此整流器设计了适用于无源无线传感系统的RFEH系统。结果通过仿真与测试对整流电路的性能进行验证,结果表明设计出的整流器在−7.5~15 dBm输入功率范围内能量收集效率均大于50%,9 dBm时达到最高的转换效率71.6%,在−14 dBm时仍有30%的转换效率可用于低功率的物联网应用。最后,基于此RFEH系统搭建了温湿度及压力无源传感系统,实验结果显示该系统可在2 m处实时监测温湿度及压力。结论本文所设计的系统对低功率的物联网应用如无线传感系统具有重要意义。
文摘为了提高压电振动能量采集器的转换输出效率,提出了一种新型自供电的去整流桥同步电感开关(Self-Powered and Rectifier-Free Synchronized Switching and Discharging to a storage Capacitor through an Inductor,RF-SSDCI)功率提取接口电路。电路由电容与三极管组成的自供电开关模块和由电感电容串联组成的功率提取模块组成。由于省去了传统的二极管整流桥结构,电路更有利于小型化与集成化。另外,电感电容串联组成的功率提取模块保证电感为储能电容充能时无需开关控制,降低了开关导通时间对电路功率提取的影响,从而减少了功率损耗。利用电路分析理论详细阐述了电路的工作原理和提取输出功率,仿真和实验结果验证了RF-SSDCI电路的有效性。RF-SSDCI的最大提取功率达到63.6μW,比SEH(Standard Energy Harvesting)电路和SP-OSCE(Self-Powered Optimized Synchronous Charge Extraction Circuit)电路提高近109.2%和135.5%。
文摘磁场能量收集是能源互联网中无线传感器供电的有效方法。磁场能量收集器(magnetic field energy harvester,MFEH)需要配合串联匹配电容、整流桥和DC-DC变换器以实现能量的最大功率提取与传输。然而,由MFEH与匹配电容和整流桥构成的高阶非线性电路无法采用低阶简化模型对其输出特性展开分析。因匹配电容与等效电感谐振,整流桥的开路电压可能超过MFEH的交流开路电压峰值,不能简单地将MFEH的交流开路电压峰值视为整流桥的开路电压。为此,文中采用相量法和高斯-赛德尔迭代法建立高阶非线性整流桥的稳态最佳输出电压的精准模型;采用四阶-五阶龙格库塔自适应方法提取整流桥的暂态开路输出特性,实现非侵入式磁场能量收集的自供电的低功耗开路电压法最大功率跟踪方案。该研究可为磁场能量收集系统最大功率点的确定和开路电压法中参数的设定提供理论支撑。
