A piezoelectric energy harvester interface circuit with adaptive conjugate impedance matching, self-startup and 71% broader bandwidth

2017 ◽  
Author(s):  
Yifeng Cai ◽  
Yiannos Manoli
Keyword(s):  
Energy Harvester ◽  
Impedance Matching ◽  
Interface Circuit ◽  
Piezoelectric Energy

scholarly journals Piezoelectric Energy Harvesting with an Ultrasonic Vibration Source

Actuators ◽  
2019 ◽  
Vol 8 (1) ◽  
pp. 8
Author(s):  
Tao Li ◽  
Pooi Lee
Keyword(s):  
Energy Harvesting ◽  
High Power ◽  
High Frequency ◽  
Energy Harvester ◽  
Impedance Matching ◽  
Low Frequency ◽  
Vibration Source ◽  
Piezoelectric Energy ◽  
Power Ultrasonic ◽  
Ultrasonic Cutting

A piezoelectric energy harvester was developed in this paper. It is actuated by the vibration leakage from the nodal position of a high-power ultrasonic cutting transducer. The harvester was excited at a low displacement amplitude (0.73 µmpp). However, its operation frequency is quite high and reaches the ultrasonic range (24.4 kHz). Compared with another low frequency harvester (66 Hz), both theoretical and experimental results proved that the advantages of this high frequency harvester include (i) high current generation capability (up to 20 mApp compared to 1.3 mApp of the 66 Hz transducer) and (ii) low impedance matching resistance (500 Ω in contrast to 50 kΩ of the 66 Hz transducer). This energy harvester can be applied either in sensing, or vibration controlling, or simply energy harvesting in a high-power ultrasonic system.

scholarly journals Improved Interface Circuit for Enhancing the Power Output of a Vibration-Threshold-Triggered Piezoelectric Energy Harvester

Energies ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3830
Author(s):  
Jiqiang Liu ◽  
Junjie Yang ◽  
Ruofeng Han ◽  
Qisheng He ◽  
Dacheng Xu ◽  
...  
Keyword(s):  
Equivalent Circuit ◽  
Piezoelectric Material ◽  
Output Power ◽  
Energy Harvester ◽  
Equivalent Circuit Model ◽  
Stage Structure ◽  
Circuit Model ◽  
Interface Circuit ◽  
Piezoelectric Energy ◽  
Vibration Threshold

The vibration-threshold-triggered piezoelectric energy harvester is a new type of piezoelectric energy harvester with a two-stage structure, which can generate electricity in a low frequency environment and recognize vibration intensity at the same time. In this study, a theoretical model of a vibration-threshold-triggered energy harvester was examined, and an equivalent circuit model of the energy harvester was obtained. Then, an interface circuit was proposed that can significantly improve the output power of the energy harvester. The interface circuit achieved impedance matching with the piezoelectric material to maximize the energy collected from the energy harvester. First, we calculated and analyzed the impedance characteristics of the energy harvester, based on the equivalent circuit model. It was found that because the piezoelectric material is in resonance as the energy harvester is in operation, the corresponding impedance is almost resistance. Therefore, a resistance-matching strategy was proposed. Last, we proposed an interface circuit with adjustable input impedance to achieve resistance matching. The experimental results show that the proposed interface circuit can increase the output power of the energy harvester by 48.1–55.7% over that achieved with the standard interface circuit.

scholarly journals Study of a Low-Power-Consumption Piezoelectric Energy Harvesting Circuit Based on Synchronized Switching Technology

Energies ◽  
2019 ◽  
Vol 12 (16) ◽  
pp. 3166
Author(s):  
Jianfeng Hong ◽  
Fu Chen ◽  
Ming He ◽  
Sheng Wang ◽  
Wenxiang Chen ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Theoretical Analysis ◽  
Power Consumption ◽  
Low Power ◽  
Impedance Matching ◽  
Maximum Energy ◽  
Low Power Consumption ◽  
Piezoelectric Energy Harvesting ◽  
Interface Circuit ◽  
Piezoelectric Energy

This paper presents a study of a piezoelectric energy harvesting circuit based on low-power-consumption synchronized switch technology. The proposed circuit includes a parallel synchronized switch harvesting on inductor interface circuit (P-SSHI) and a step-down DC-DC converter. The synchronized switch technology is applied to increase the conversion efficiency of the circuit. The DC-DC converter is used to accomplish the impedance matching for different loads. A low-power-consumption microcontroller and discrete components are used to build the P-SSHI interface circuit. The study starts with theoretical analysis and simulations of the P-SSHI interface circuit. Simulations and experiments were conducted to validate the theoretical analysis. The experimental results show that the maximum energy harvested by the system with a P-SSHI interface circuit is 231 μW, which is 2.89 times that of a system without the P-SSHI scheme. The power consumption of the P-SSHI interface circuit can be as low as 10.6 μW.

Segmented impact-type piezoelectric energy harvester for self-start impedance matching circuit

2018 ◽  
Vol 27 (11) ◽  
pp. 114006 ◽  
Author(s):  
Hyun Jun Jung ◽  
Soobum Lee ◽  
Sinwoo Jeong ◽  
Hong Hee Yoo
Keyword(s):  
Energy Harvester ◽  
Impedance Matching ◽  
Piezoelectric Energy

Self-Start Piezoelectric Energy Harvesting Circuit With Adjustable UVLO Converter for Wireless Sensor Network

2017 ◽  
Author(s):  
Hyun Jun Jung ◽  
Soobum Lee ◽  
Hamid Jabbar ◽  
Se Yeong Jeong ◽  
Tae Hyun Sung
Keyword(s):  
Wireless Sensor Network ◽  
Energy Harvesting ◽  
Sensor Network ◽  
Energy Harvester ◽  
Impedance Matching ◽  
Wireless Sensor ◽  
Experimental Result ◽  
Piezoelectric Energy Harvesting ◽  
Wireless Sensor Node ◽  
Piezoelectric Energy

This paper proposes a self-start piezoelectric energy harvesting circuit with an undervoltage-lockout (UVLO) converter for a wireless sensor network (WSN). First, a self-start circuit with mini piezoelectric energy harvester (PEH) is designed to supply the power for operation of the oscillator without battery. The experimental results show that a batteryless self-start circuit successfully operates the oscillator with mini-PEH, and self-starting time is 0.45 s. Second, this paper proposes an adjustable UVLO converter that can supply the power even if a power consumption of a wireless sensor node is higher than generated power from PEH. The experimental result shows the adjustable UVLO converter supplies 45 mW for 0.12 s after charging the output power of an impedance matching circuit (1.7 mW) for 10 s. This paper shows that the proposed circuit successfully overcomes challenging issues — self-start and lower power generation — for powering WSN.

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