The Experts below are selected from a list of 119583 Experts worldwide ranked by ideXlab platform
Litian Liu - One of the best experts on this subject based on the ideXlab platform.
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analyses of vibration based piezoelectric Power Generator in discontinuous operation mode
Sensors and Actuators A-physical, 2009Co-Authors: Jianhui Lin, Hao Chen, Xi Liu, Tianling Ren, Litian LiuAbstract:Vibration energy can be converted into electrical energy using piezoelectric Power Generator. The electrical energy is usually collected in a storage capacitor. The storage capacitor discharges to the load only when enough energy is harvested for the required operation. The time interval between successive required operations depends on several parameters: characteristics of piezoelectric Power Generator and vibration magnitude, energy requirement and voltage interval, and value of the storage capacitor. In this paper, theoretical and experimental analyses of these parameters are performed to choose appropriate values of the voltage interval and storage capacitor to minimize the time interval. Theoretical analyses are well conformed by the experimental results. Analysis results are instructive for applications of both macro and MEMS-based piezoelectric Power Generator.
Haluk Kulah - One of the best experts on this subject based on the ideXlab platform.
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an electromagnetic micro Power Generator for wideband environmental vibrations
Sensors and Actuators A-physical, 2008Co-Authors: Ibrahim Sari, Tuna Balkan, Haluk KulahAbstract:Abstract This paper presents a wideband electromagnetic vibration-to-electrical micro Power Generator. The micro Generator is capable of generating steady Power over a predetermined frequency range. Power is generated by means of the relative motion between a magnet and coils fabricated over resonating cantilevers through electromagnetic induction. The reported Generator covers a wide band of external vibration frequency by implementing a number of serially connected cantilevers in different lengths resulting in an array of cantilevers with varying natural frequencies. The device generates 0.4 μW of continuous Power with 10 mV voltage in an external vibration frequency range of 4.2–5 kHz, covering a band of 800 Hz.
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A Wideband Electromagnetic Micro Power Generator for Wireless Microsystems
TRANSDUCERS 2007 - 2007 International Solid-State Sensors Actuators and Microsystems Conference, 2007Co-Authors: Ibrahim Sari, Tuna Balkan, Haluk KulahAbstract:This paper presents a wideband electromagnetic (EM) vibration-to-electrical Power Generator which can efficiently scavenge energy and generate steady Power over a predetermined frequency range. Power is generated by means of electromagnetic induction using a magnet and coils on top of resonating cantilever beams. The reported Generator covers a wide band of external vibration frequency by implementing a number of serially connected cantilevers in different lengths. The device generates 0.5 μW continuous Power with 20 mV voltage between 3.3 and 3.6 kHz of external vibration.
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an electromagnetic micro Power Generator for low frequency environmental vibrations
International Conference on Micro Electro Mechanical Systems, 2004Co-Authors: Haluk Kulah, Khalil NajafiAbstract:This paper presents an electromagnetic (EM) vibration-to-electrical Power Generator which can efficiently scavenge energy from low-frequency external vibrations. The reported Generator up-converts low-frequency environmental vibrations to a much higher frequency through a novel electro-mechanical frequency up-converter using a magnet, and hence provides efficient energy conversion even at low frequencies. Power is generated by means of electromagnetic induction using a magnet and coils on top of resonating cantilever beams. The expected maximum Power from a single cantilever is 2.5 /spl mu/W in vacuum. The proposed system has been tested in milliscale and the frequency up-conversion technique has been verified.
Jianhui Lin - One of the best experts on this subject based on the ideXlab platform.
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analyses of vibration based piezoelectric Power Generator in discontinuous operation mode
Sensors and Actuators A-physical, 2009Co-Authors: Jianhui Lin, Hao Chen, Xi Liu, Tianling Ren, Litian LiuAbstract:Vibration energy can be converted into electrical energy using piezoelectric Power Generator. The electrical energy is usually collected in a storage capacitor. The storage capacitor discharges to the load only when enough energy is harvested for the required operation. The time interval between successive required operations depends on several parameters: characteristics of piezoelectric Power Generator and vibration magnitude, energy requirement and voltage interval, and value of the storage capacitor. In this paper, theoretical and experimental analyses of these parameters are performed to choose appropriate values of the voltage interval and storage capacitor to minimize the time interval. Theoretical analyses are well conformed by the experimental results. Analysis results are instructive for applications of both macro and MEMS-based piezoelectric Power Generator.
Khalil Najafi - One of the best experts on this subject based on the ideXlab platform.
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Micro Power Generator for Harvesting Low-Frequency and Nonperiodic Vibrations
Journal of Microelectromechanical Systems, 2011Co-Authors: Tzeno Galchev, Khalil NajafiAbstract:This paper presents a new inertial Power Generator for scavenging low-frequency nonperiodic vibrations called the Parametric Frequency-Increased Generator (PFIG). The PFIG utilizes three magnetically coupled mechanical structures to initiate high-frequency mechanical oscillations in an electromechanical transducer. The fixed internal displacement and dynamics of the PFIG allow it to operate more effectively than resonant Generators when the ambient vibration amplitude is higher than the internal displacement limit of the device. The design, fabrication, and testing of an electromagnetic PFIG are discussed. The developed PFIG can generate a peak Power of 163 μW and an average Power of 13.6 μW from an input acceleration of 9.8 m/s2 at 10 Hz, and it can operate at frequencies up to 65 Hz, giving it an unprecedented operating bandwidth and versatility. The internal volume of the Generator is 2.12 cm3 (3.75 cm3 including the casing). The harvester has a volume figure of merit of 0.068% and a bandwidth figure of merit of 0.375%. These values, although seemingly low, are the highest reported in the literature for a device of this size and operating in the difficult frequency range of ≤ 20 Hz.
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a piezoelectric frequency increased Power Generator for scavenging low frequency ambient vibration
International Conference on Micro Electro Mechanical Systems, 2010Co-Authors: Tzeno Galchev, Ethem Erkan Aktakka, Hanseup Kim, Khalil NajafiAbstract:This paper presents the design, fabrication, and testing of a piezoelectric inertial micro Power Generator for scavenging low-frequency non-periodic vibrations. A mechanism up-converts the ambient vibration frequency to a higher internal operation frequency, in order to achieve better electromechanical coupling and efficiency: enhancing the Generators performance at very low frequencies (≪30Hz). The Generator incorporates a bulk piezoelectric ceramic machined using ultrafast laser ablation. The fabricated device generated a peak Power of 100µW and an average Power of 3.25µW from an input acceleration of 9.8m/s2 at 10Hz. The device operates over a frequency range of 24Hz. The internal volume of the Generator is 1.2cm3.
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an electromagnetic micro Power Generator for low frequency environmental vibrations
International Conference on Micro Electro Mechanical Systems, 2004Co-Authors: Haluk Kulah, Khalil NajafiAbstract:This paper presents an electromagnetic (EM) vibration-to-electrical Power Generator which can efficiently scavenge energy from low-frequency external vibrations. The reported Generator up-converts low-frequency environmental vibrations to a much higher frequency through a novel electro-mechanical frequency up-converter using a magnet, and hence provides efficient energy conversion even at low frequencies. Power is generated by means of electromagnetic induction using a magnet and coils on top of resonating cantilever beams. The expected maximum Power from a single cantilever is 2.5 /spl mu/W in vacuum. The proposed system has been tested in milliscale and the frequency up-conversion technique has been verified.
Ibrahim Sari - One of the best experts on this subject based on the ideXlab platform.
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an electromagnetic micro Power Generator for wideband environmental vibrations
Sensors and Actuators A-physical, 2008Co-Authors: Ibrahim Sari, Tuna Balkan, Haluk KulahAbstract:Abstract This paper presents a wideband electromagnetic vibration-to-electrical micro Power Generator. The micro Generator is capable of generating steady Power over a predetermined frequency range. Power is generated by means of the relative motion between a magnet and coils fabricated over resonating cantilevers through electromagnetic induction. The reported Generator covers a wide band of external vibration frequency by implementing a number of serially connected cantilevers in different lengths resulting in an array of cantilevers with varying natural frequencies. The device generates 0.4 μW of continuous Power with 10 mV voltage in an external vibration frequency range of 4.2–5 kHz, covering a band of 800 Hz.
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A Wideband Electromagnetic Micro Power Generator for Wireless Microsystems
TRANSDUCERS 2007 - 2007 International Solid-State Sensors Actuators and Microsystems Conference, 2007Co-Authors: Ibrahim Sari, Tuna Balkan, Haluk KulahAbstract:This paper presents a wideband electromagnetic (EM) vibration-to-electrical Power Generator which can efficiently scavenge energy and generate steady Power over a predetermined frequency range. Power is generated by means of electromagnetic induction using a magnet and coils on top of resonating cantilever beams. The reported Generator covers a wide band of external vibration frequency by implementing a number of serially connected cantilevers in different lengths. The device generates 0.5 μW continuous Power with 20 mV voltage between 3.3 and 3.6 kHz of external vibration.
