Compact, digital and self-powered piezoelectric vibration energy harvester with generation control using voltage measurement circuit

Hara, Yushin; Saito, Kensuke; Makihara, Kanjuro

doi:10.1016/j.sna.2019.111609

Cited by 18 publications

(17 citation statements)

References 26 publications

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“…For the realization of the state estimation method, the digital controller needs to measure the piezoelectric voltage. In a previous study, we had proposed the self-powered SSHI harvester controlled by a digital controller (Hara et al, 2019). The energy needed to drive this harvester is harvested from the structural vibrations.…”

Section: Methodsmentioning

confidence: 99%

“…This self-powered SSHI harvester performs switching using analog values with analog controllers such as passive and simple semiconductor elements. In contrast, the self-powered SSHI harvester proposed by Yamamoto et al (2015) and Hara et al (2019) performs switching using digital values with an analog-to-digital convertor and a digital controller. All the energy needed to drive this harvester is harvested from the structural vibrations.…”

Section: Introductionmentioning

confidence: 99%

“…Although many researchers realized a sensor-less harvester using a single piezoelectric transducer, the sensed information is not quantitative but qualitative such as peak detections and zero crossing detections. The simplicity of the traditional SSHI switching strategy makes it possible for a controller equipped in a sensor-less harvester to perform appropriate switching without quantitative information (Hara et al, 2019). Recently, a few researchers have proposed improved switching strategies.…”

Section: Introductionmentioning

confidence: 99%

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Self-sensing state estimation of switch-controlled energy harvesters

Hara

Yamamoto

Makihara

2020

Journal of Intelligent Material Systems and Structures

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Vibration energy harvesters are expected to become a new source of electrical power. Piezoelectric vibration energy harvesters that employ a piezoelectric transducer, a rectifier, and a storage capacitor are being used widely as electro-mechanical harvesters. Synchronized switch harvesting on inductor enhances harvesting performance due to employing a simple additional circuit and incorporating suitable switch control functionality. Switching is usually based on the displacement of a vibrating structure; hence, sensing the vibrational states is of critical importance. Conventionally, the structural displacement is measured by displacement sensors or accelerometers attached to the target vibrating structure. Although enhancement of performance through synchronized switch harvesting on inductor equipped with sensors is important, the arrangement requirements of sensors have adverse effects on the compactness and usability of the harvesters. This study aimed to eliminate the use of sensors from switch-controlled harvesters. We developed a new state estimation method that uses the piezoelectric transducer’s voltage as an observation value. Using the proposed state estimation method, the modal state values of the vibrating structure can be determined by simply measuring the voltage of the transducer. With the switch device being controlled by the estimated modal state values, no sensors are required for ensuring effective harvesting. A comparison of the harvesting performances by the proposed self-sensing state estimation method and the conventional sensor-equipped state estimation method showed that there is little difference in harvested power between the two methods over a wide range of load resistances. The proposed method is superior to the sensor-equipped method in terms of compactness and usability as it does not require any external sensors.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Self-sensing state estimation of switch-controlled energy harvesters

Hara

Yamamoto

Makihara

2020

Journal of Intelligent Material Systems and Structures

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“…These types of transducers generally produce large open circuit voltage amplitudes. Common implementations of PSSHI control circuits for these cases consist of digital controls that can be very power hungry (up to 1

) [ 26 ]; bipolar transistor switches which require large voltage amplitudes for operation (typically > 1

) [ 20 , 22 , 38 ]; or integrated circuits that, despite their low input voltage requirements, can become costly for low-volume applications.…”

Section: System Design and Implementationmentioning

confidence: 99%

“…The study presents the implementation of a self-powered synchronized switch on inductor circuit to improve the power generation performance of the PFEH. Compared to previously reported self-powered active power improvement units that require integrated circuit design, complex control techniques [ 23 , 24 , 25 , 26 ] or high-voltage amplitudes for operation [ 21 , 22 , 27 , 28 ], we present a circuit implementation adapted for lower voltages and using off-the-shelf components.…”

Section: Introductionmentioning

confidence: 99%

Self-Powered Wireless Sensor Using a Pressure Fluctuation Energy Harvester

Aranda

Bader

Oelmann

2021

Sensors

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Condition monitoring devices in hydraulic systems that use batteries or require wired infrastructure have drawbacks that affect their installation, maintenance costs, and deployment flexibility. Energy harvesting technologies can serve as an alternative power supply for system loads, eliminating batteries and wiring requirements. Despite the interest in pressure fluctuation energy harvesters, few studies consider end-to-end implementations, especially for cases with low-amplitude pressure fluctuations. This generates a research gap regarding the practical amount of energy available to the load under these conditions, as well as interface circuit requirements and techniques for efficient energy conversion. In this paper, we present a self-powered sensor that integrates an energy harvester and a wireless sensing system. The energy harvester converts pressure fluctuations in hydraulic systems into electrical energy using an acoustic resonator, a piezoelectric stack, and an interface circuit. The prototype wireless sensor consists of an industrial pressure sensor and a low-power Bluetooth System-on-chip that samples and wirelessly transmits pressure data. We present a subsystem analysis and a full system implementation that considers hydraulic systems with pressure fluctuation amplitudes of less than 1 bar and frequencies of less than 300 Hz. The study examines the frequency response of the energy harvester, the performance of the interface circuit, and the advantages of using an active power improvement unit adapted for piezoelectric stacks. We show that the interface circuit used improves the performance of the energy harvester compared to previous similar studies, showing more power generation compared to the standard interface. Experimental measurements show that the self-powered sensor system can start up by harvesting energy from pressure fluctuations with amplitudes starting at 0.2 bar at 200 Hz. It can also sample and transmit sensor data at a rate of 100 Hz at 0.7 bar at 200 Hz. The system is implemented with off-the-shelf circuits.

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