Letteratura scientifica selezionata sul tema "Piezoelectric DC-DC converter"
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Articoli di riviste sul tema "Piezoelectric DC-DC converter"
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Dallago, E., e A. Danioni. "Resonance frequency tracking control for piezoelectric transformer DC-DC converter". Electronics Letters 37, n. 22 (2001): 1317. http://dx.doi.org/10.1049/el:20010898.
Testo completo
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Issa, Adel Issa Ben, Salem Alarabi Shufat, Jamal Mohamed Ahmed e Hasan Abunouara. "A bridgeless AC-DC step up regulator circuit for piezoelectric energy harvester". Journal of Pure & Applied Sciences 22, n. 1 (21 febbraio 2023): 12–17. http://dx.doi.org/10.51984/jopas.v22i1.2339.
Testo completoAbstract (sommario):
Various applications of the piezoelectric energy in the modern world require an efficient AC-DC low power converter. As the two stages converter with bridge rectifiers may not be used because the diodes would not be suitable for low volt ranging between 100 to 200mv, these are considered an efficient element in the low volt circuits because of their entire losses. In this paper, a small and efficient AC-DC low power converter is presented. It directly converts low AC voltage to the required output DC voltage using one stage instead of bridge rectification. The proposed converter combines both boost and buck boost converters which are parallel constructed to condition the positive and negative half cycle of the input AC volt respectively. Two inductors and one capacitor are used for booth circuits in terms of reducing the size. The circuit is tested at 50 kHz switching frequency with two different duty cycles to rectify a 0.5 AC volt to about 3 DC volts with an estimated efficiency of 65%. The simulation result was 3.7 DC V from 0.5 ACV. The circuit analysis and the design guide line are explained. The circuit is designed and tested using Matlab (Simulink) software.
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Almgotir, Hasan Ma, Enaam A. Khaliq Ali, Wedian H. Abd al ameer e Mustafa A. Fadel Al-Qaisi. "Harmonics elimination for DC/DC power supply based on piezoelectric filters". International Journal of Power Electronics and Drive Systems (IJPEDS) 12, n. 1 (1 marzo 2021): 356. http://dx.doi.org/10.11591/ijpeds.v12.i1.pp356-363.
Testo completoAbstract (sommario):
This research presents a study, modelling and simulation of the piezoelectric material work as filters (piezoelectric filter) used to eliminate the harmonics in power electronic circuits, high order harmonics are generating due to the high switching frequencies and circuit equipment, detailed simulation is achieved for the piezoelectric filter tested in full-bridge DC/DC converter circuit with resistive load works as dc power supply (12 to 48 volt). As a result, the uses of piezoelectric filters have a great impact on harmonics elimination, which leads to reduce the overall total harmonic distortion leads to increase the efficiency, as well as the output voltage from the dc power supply remain constant by varying the load resistance over a wide range. The dc power supply circuit including the piezoelectric filter has been simulated using PSIM (V9.1) power electronic circuit simulation software.
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Hwang, Lark-Hoon, Seung-Kwon Na e Gi-Ho Choi. "A study on High Frequency DC-DC Converter Drive using a Piezoelectric Transformer". Journal of the Korea Academia-Industrial cooperation Society 11, n. 2 (28 febbraio 2010): 476–84. http://dx.doi.org/10.5762/kais.2010.11.2.476.
Testo completo
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Roshandel, Emad, Amin Mahmoudi, Solmaz Kahourzade e Hamid Davazdah-Emami. "DC-DC High-Step-Up Quasi-Resonant Converter to Drive Acoustic Transmitters". Energies 15, n. 15 (8 agosto 2022): 5745. http://dx.doi.org/10.3390/en15155745.
Testo completoAbstract (sommario):
This paper proposes a quasi-resonant step-up DC-DC converter to provide the DC-link voltage for piezoelectric transmitters (PZETs). The resonance not only provides a soft-switching condition for the converter switches, but also helps to decrease the converter element sizes for marine applications. Operation modes of the proposed converter are discussed. The current and voltage of the converter components are derived analytically, and hence the converter gain is obtained. The performance of the proposed high-step-up, high-power density converter is examined through a comprehensive simulation study. The simulation results demonstrate the soft-switching operation and short transient time required for the converter to reach the reference output voltage. The converter output voltage remains unchanged when an inverter with a passive filter is placed at its output while supplying the PZET. The proposed DC-DC converter is prototyped to validate the converter gain and soft-switching operation experimentally. The converter gain and soft-switching results in simulation are well matched with those of the experimental tests. The converter efficiency in three different switching frequencies is obtained experimentally. The power density of the proposed topology is determined via the designing of a printed circuit board. The experimental results demonstrate the appropriate gain and efficiency of the converter in the tested power range.
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Srinivasan, Raghavendran, Umapathy Mangalanathan e Uma Gandhi. "A three-port integrated DC–DC converter for piezoelectric energy harvesting". Ferroelectrics 583, n. 1 (26 ottobre 2021): 212–29. http://dx.doi.org/10.1080/00150193.2021.1980333.
Testo completo
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Touhami, Mustapha, Ghislain Despesse e Francois Costa. "A New Topology of DC–DC Converter Based on Piezoelectric Resonator". IEEE Transactions on Power Electronics 37, n. 6 (giugno 2022): 6986–7000. http://dx.doi.org/10.1109/tpel.2022.3142997.
Testo completo
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KIM, HWASOO, EUNSUNG JANG, DOHYUNG KIM, LARKHOON HWANG e JUHYUN YOO. "THICKNESS–VIBRATION-MODE MULTILAYER PIEZOELECTRIC TRANSFORMER FOR DC-DC CONVERTER APPLICATION". Integrated Ferroelectrics 107, n. 1 (20 ottobre 2009): 12–23. http://dx.doi.org/10.1080/10584580903324071.
Testo completo
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Pollet, Benjamin, Ghislain Despesse e Francois Costa. "A New Non-Isolated Low-Power Inductorless Piezoelectric DC–DC Converter". IEEE Transactions on Power Electronics 34, n. 11 (novembre 2019): 11002–13. http://dx.doi.org/10.1109/tpel.2019.2900526.
Testo completo
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Abidin, Nik Ahmad Kamil Zainal, Norkharziana Mohd Nayan, M. M. Azizan, Nursabirah Jamel, Azuwa Ali, N. A. Azli e N. M. Nordin. "Performances of Multi-Configuration Piezoelectric Connection with AC-DC Converter in Low Frequency Energy Harvesting System". Journal of Physics: Conference Series 2550, n. 1 (1 agosto 2023): 012001. http://dx.doi.org/10.1088/1742-6596/2550/1/012001.
Testo completoAbstract (sommario):
Abstract Harvesting energy by capturing vibration from low frequency energy have been explored extensively. In essence, a single piezoelectric transducer or an array of piezoelectric connections are used to convert kinetic energy into electrical energy in order to produce low frequency energy. In this paper, multi-configuration array piezoelectric connections are used to investigate the performances of different converter circuit types in low energy harvesting applications. This research utilized three pieces of circular piezoelectric sensor to test the combinations of array connection. There are four options for the piezoelectric sensor configuration: parallel (P), series (S), parallel-series (PS), and series-parallel (SP) while the full wave bridge rectifier (FWBR), parallel voltage multiplier (PVM), and parallel Synchronized Switch Harvesting on Inductor (P-SSHI) converter circuit are chosen AC-DC converter circuits. The system is assessed using a variety of load configurations, including 10 kΩ and 1 MΩ with a 3 Hz input frequency. In order to produce the highest possible output of collected power, the observation focuses on identifying the ideal combination of array piezoelectric connections with AC-DC converter. The result shows that 3-Parallel (3P) piezoelectric connection obtained a higher power output among the other types of array piezoelectric which was 5.97μW. The FWBR circuit generated the highest output power with 2.42μW for a combination of piezoelectric sensors array of 3P connection with the AC-DC converter.
Tesi sul tema "Piezoelectric DC-DC converter"
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Pereira, Lucas de Araújo. "Intégration microélectronique de convertisseurs DC/DC piézoélectriques". Electronic Thesis or Diss., Université Grenoble Alpes, 2024. http://www.theses.fr/2024GRALY023.
Testo completoAbstract (sommario):
L'électronique de puissance vise à conditionner et contrôler l'énergie d'une source vers une charge. Les convertisseurs de puissance, tels que les convertisseurs DC-DC, génèrent une tension de sortie stable à partir d'une tension d'entrée non stable. Dans la quête de miniaturisation et d'augmentation de la densité de puissance, l'utilisation d'un élément piézoélectrique pour le stockage d'énergie mécanique offre des perspectives prometteuses, notamment à des fréquences de l'ordre du MHz.La thèse vise à contribuer au domaine des convertisseurs DC-DC utilisant des résonateurs piézoélectriques pour stocker l'énergie mécaniquement. L'objectif est de proposer des stratégies de régulation et un circuit intégré pour les convertisseurs DC-DC piézoélectriques non isolés fonctionnant à plusieurs MHz. Ces convertisseurs présentent un intérêt majeur en éliminant le composant magnétique traditionnel, favorisant ainsi la miniaturisation et l'augmentation de la densité de puissance. Le manque de régulation à haute fréquence constitue une lacune que la thèse s'efforce de combler.Cette thèse présente des convertisseurs DC-DC piézoélectrique, mettant en évidence son importance pour accroître la densité de puissance. L'état de l'art de ces convertisseurs est exploré, réalisant une comparaison objective des performances entre les topologies existantes. Nous introduisons un modèle théorique générique pour toutes les topologies de convertisseurs DC-DC piézoélectriques, apportant une avancée significative dans la prédiction de la fréquence d'opération, de la durée de chaque phase du cycle de conversion et de l'amplitude maximale du courant piézoélectrique en fonction de la puissance transmise et du résonateur piézoélectrique utilisé. Une étude d'optimisation de ces convertisseurs est également menée dans le but de définir la fréquence de fonctionnement optimale (le résonateur piézoélectrique à utiliser) et la topologie optimale à mettre en œuvre pour maximiser la densité de puissance tout en minimisant les pertes, pour une tension d'entrée, un rapport de conversion et une puissance de sortie donnés.Dans ce manuscrit il est présenté une stratégie de régulation à une fréquence d'environ 10 MHz basée sur cinq boucles de contrôle fonctionnant en parallèle. La validation de cette stratégie est discutée, mettant en lumière les défis liés aux simulations. Nous présentons le processus de conception analogique des principaux blocs de chaque boucle de régulation, ainsi que sur deux étages de puissance optimisés pour différentes puissances de sortie en technologie XFAB06. Il est également présenté le layout final du convertisseur conçu et les simulations avec des variations de fabrication liés au circuit intégré et de température. Des résultats réalistes sont obtenus, démontrant le bon fonctionnement du convertisseur à environ 10, 6 et 1 MHz.Les prochaines étapes impliquent des mesures expérimentales sur le circuit intégré conçu, une étude théorique approfondie des boucles de régulation pour différentes topologies, et l'exploration de solutions telles qu'un FPGA pour une régulation à environ 10 MHz. La recherche vise à renforcer la robustesse et la flexibilité des convertisseurs DC-DC piézoélectriques non isolés, ouvrant la voie à des applications plus diversifiées et efficaces au-delà du MHz. En résumé, cette thèse constitue une première preuve de concept pour le développement de convertisseurs piézoélectriques plus robustes en termes de densité de puissance, de faible rayonnement électromagnétique et de compacité du résonateur piézoélectriquePower electronics aims to condition and control energy from a source to a load. Power converters, such as DC-DC converters, generate a stable output voltage from an unstable input voltage. In the pursuit of miniaturization and increased power density, the use of a piezoelectric element for mechanical energy storage holds promising prospects, especially at frequencies on the order of MHz.The thesis aims to contribute to the field of DC-DC converters using piezoelectric resonators for mechanical energy storage. The goal is to propose regulation strategies and an integrated circuit for non-isolated piezoelectric DC-DC converters operating at multiple MHz. These converters are of significant interest as they eliminate the traditional magnetic component, thus favoring miniaturization and increased power density. The lack of high-frequency regulation is a gap that the thesis strives to fill.This thesis presents piezoelectric DC-DC converters, highlighting their importance in increasing power density. The state of the art of these converters is explored, providing an objective comparison of performance among existing topologies. A generic theoretical model for all piezoelectric DC-DC converter topologies is introduced, representing a significant advance in predicting the operating frequency, duration of each phase of the conversion cycle, and the maximum amplitude of the piezoelectric current as a function of transmitted power and the piezoelectric resonator used. An optimization study of these converters is also conducted to define the optimal operating frequency (the piezoelectric resonator to be used) and the optimal topology to implement, maximizing power density while minimizing losses for a given input voltage, conversion ratio, and output power.In this manuscript, a regulation strategy at a frequency of approximately 10 MHz based on five parallel control loops is presented. The validation of this strategy is discussed, highlighting the challenges related to simulations. The analog design process of the main blocks of each regulation loop is presented, as well as two power stages optimized for different output powers in XFAB06 technology. The final layout of the designed converter and simulations with manufacturing variations related to the integrated circuit and temperature are also presented. Realistic results are obtained, demonstrating the proper operation of the converter at around 10, 6, and 1 MHz.The next steps involve experimental measurements on the designed integrated circuit, a comprehensive theoretical study of regulation loops for different topologies, and the exploration of solutions such as an FPGA for regulation at around 10 MHz. The research aims to strengthen the robustness and flexibility of non-isolated piezoelectric DC-DC converters, paving the way for more diverse and efficient applications beyond the MHz range. In summary, this thesis constitutes an initial proof of concept for the development of more robust piezoelectric converters in terms of power density, low electromagnetic radiation, and compactness of the piezoelectric resonator
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Kong, Na. "Low-power Power Management Circuit Design for Small Scale Energy Harvesting Using Piezoelectric Cantilevers". Diss., Virginia Tech, 2011. http://hdl.handle.net/10919/77074.
Testo completoAbstract (sommario):
The batteries used to power wireless sensor nodes have become a major roadblock for the wide deployment. Harvesting energy from mechanical vibrations using piezoelectric cantilevers provides possible means to recharge the batteries or eliminate them. Raw power harvested from ambient sources should be conditioned and regulated to a desired voltage level before its application to electronic devices. The efficiency and self-powered operation of a power conditioning and management circuit is a key design issue.
In this research, we investigate the characteristics of piezoelectric cantilevers and requirements of power conditioning and management circuits. A two-stage conditioning circuit with a rectifier and a DC-DC converter is proposed to match the source impedance dynamically. Several low-power design methods are proposed to reduce power consumption of the circuit including: (i) use of a discontinuous conduction mode (DCM) flyback converter, (ii) constant on-time modulation, and (iii) control of the clock frequency of a microcontroller unit (MCU). The DCM flyback converter behaves as a lossless resistor to match the source impedance for maximum power point tracking (MPPT). The constant on-time modulation lowers the clock frequency of the MCU by more than an order of magnitude, which reduces dynamic power dissipation of the MCU. MPPT is executed by the MCU at intermittent time interval to save power. Experimental results indicate that the proposed system harvests up to 8.4 mW of power under 0.5-g base acceleration using four parallel piezoelectric cantilevers and achieves 72 percent power efficiency. Sources of power losses in the system are analyzed. The diode and the controller (specifically the MCU) are the two major sources for the power loss.
In order to further improve the power efficiency, the power conditioning circuit is implemented in a monolithic IC using 0.18-μm CMOS process. Synchronous rectifiers instead of diodes are used to reduce the conduction loss. A mixed-signal control circuit is adopted to replace the MCU to realize the MPPT function. Simulation and experimental results verify the DCM operation of the power stage and function of the MPPT circuit. The power consumption of the mixed-signal control circuit is reduced to 16 percent of that of the MCU.Ph. D.
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Ghasemi, Negareh. "Improving ultrasound excitation systems using a flexible power supply with adjustable voltage and frequency to drive piezoelectric transducers". Thesis, Queensland University of Technology, 2012. https://eprints.qut.edu.au/61091/1/Negareh_Ghasemi_Thesis.pdf.
Testo completoAbstract (sommario):
The ability of a piezoelectric transducer in energy conversion is rapidly expanding in several applications. Some of the industrial applications for which a high power ultrasound transducer can be used are surface cleaning, water treatment, plastic welding and food sterilization. Also, a high power ultrasound transducer plays a great role in biomedical applications such as diagnostic and therapeutic applications. An ultrasound transducer is usually applied to convert electrical energy to mechanical energy and vice versa. In some high power ultrasound system, ultrasound transducers are applied as a transmitter, as a receiver or both. As a transmitter, it converts electrical energy to mechanical energy while a receiver converts mechanical energy to electrical energy as a sensor for control system. Once a piezoelectric transducer is excited by electrical signal, piezoelectric material starts to vibrate and generates ultrasound waves. A portion of the ultrasound waves which passes through the medium will be sensed by the receiver and converted to electrical energy. To drive an ultrasound transducer, an excitation signal should be properly designed otherwise undesired signal (low quality) can deteriorate the performance of the transducer (energy conversion) and increase power consumption in the system. For instance, some portion of generated power may be delivered in unwanted frequency which is not acceptable for some applications especially for biomedical applications.
To achieve better performance of the transducer, along with the quality of the excitation signal, the characteristics of the high power ultrasound transducer should be taken into consideration as well. In this regard, several simulation and experimental tests are carried out in this research to model high power ultrasound transducers and systems. During these experiments, high power ultrasound transducers are excited by several excitation signals with different amplitudes and frequencies, using a network analyser, a signal generator, a high power amplifier and a multilevel converter. Also, to analyse the behaviour of the ultrasound system, the voltage ratio of the system is measured in different tests. The voltage across transmitter is measured as an input voltage then divided by the output voltage which is measured across receiver. The results of the transducer characteristics and the ultrasound system behaviour are discussed in chapter 4 and 5 of this thesis.
Each piezoelectric transducer has several resonance frequencies in which its impedance has lower magnitude as compared to non-resonance frequencies. Among these resonance frequencies, just at one of those frequencies, the magnitude of the impedance is minimum. This resonance frequency is known as the main resonance frequency of the transducer. To attain higher efficiency and deliver more power to the ultrasound system, the transducer is usually excited at the main resonance frequency. Therefore, it is important to find out this frequency and other resonance frequencies. Hereof, a frequency detection method is proposed in this research which is discussed in chapter 2.
An extended electrical model of the ultrasound transducer with multiple resonance frequencies consists of several RLC legs in parallel with a capacitor. Each RLC leg represents one of the resonance frequencies of the ultrasound transducer. At resonance frequency the inductor reactance and capacitor reactance cancel out each other and the resistor of this leg represents power conversion of the system at that frequency. This concept is shown in simulation and test results presented in chapter 4.
To excite a high power ultrasound transducer, a high power signal is required. Multilevel converters are usually applied to generate a high power signal but the drawback of this signal is low quality in comparison with a sinusoidal signal. In some applications like ultrasound, it is extensively important to generate a high quality signal. Several control and modulation techniques are introduced in different papers to control the output voltage of the multilevel converters. One of those techniques is harmonic elimination technique. In this technique, switching angles are chosen in such way to reduce harmonic contents in the output side. It is undeniable that increasing the number of the switching angles results in more harmonic reduction. But to have more switching angles, more output voltage levels are required which increase the number of components and cost of the converter. To improve the quality of the output voltage signal with no more components, a new harmonic elimination technique is proposed in this research. Based on this new technique, more variables (DC voltage levels and switching angles) are chosen to eliminate more low order harmonics compared to conventional harmonic elimination techniques. In conventional harmonic elimination method, DC voltage levels are same and only switching angles are calculated to eliminate harmonics. Therefore, the number of eliminated harmonic is limited by the number of switching cycles. In the proposed modulation technique, the switching angles and the DC voltage levels are calculated off-line to eliminate more harmonics. Therefore, the DC voltage levels are not equal and should be regulated. To achieve this aim, a DC/DC converter is applied to adjust the DC link voltages with several capacitors. The effect of the new harmonic elimination technique on the output quality of several single phase multilevel converters is explained in chapter 3 and 6 of this thesis.
According to the electrical model of high power ultrasound transducer, this device can be modelled as parallel combinations of RLC legs with a main capacitor. The impedance diagram of the transducer in frequency domain shows it has capacitive characteristics in almost all frequencies. Therefore, using a voltage source converter to drive a high power ultrasound transducer can create significant leakage current through the transducer. It happens due to significant voltage stress (dv/dt) across the transducer. To remedy this problem, LC filters are applied in some applications. For some applications such as ultrasound, using a LC filter can deteriorate the performance of the transducer by changing its characteristics and displacing the resonance frequency of the transducer. For such a case a current source converter could be a suitable choice to overcome this problem. In this regard, a current source converter is implemented and applied to excite the high power ultrasound transducer. To control the output current and voltage, a hysteresis control and unipolar modulation are used respectively. The results of this test are explained in chapter 7.
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Lin, Chih-yi. "Design and Analysis of Piezoelectric Transformer Converters". Diss., Virginia Tech, 1997. http://hdl.handle.net/10919/30723.
Testo completoAbstract (sommario):
Piezoelectric ceramics are characterized as smart materials and have been widely used in the area of actuators and sensors. The principle operation of a piezoelectric transformer (PT) is a combined function of actuators and sensors so that energy can be transformed from electrical form to electrical form via mechanical vibration.
Since PTs behave as band-pass filters, it is particularly important to control their gains as transformers and to operate them efficiently as power-transferring components. In order to incorporate a PT into amplifier design and to match it to the linear or nonlinear loads, suitable electrical equivalent circuits are required for the frequency range of interest. The study of the accuracy of PT models is carried out and verified from several points of view, including input impedance, voltage gain, and efficiency.
From the characteristics of the PTs, it follows that the efficiency of the PTs is a strong function of load and frequency. Because of the big intrinsic capacitors, adding inductive loads to the PTs is essential to obtain a satisfactory efficiency for the PTs and amplifiers. Power-flow method is studied and modified to obtain the maximum efficiency of the converter. The algorithm for designing a PT converter or inverter is to calculate the optimal load termination, YOPT, of the PT first so that the efficiency (power gain) of the PT is maximized. And then the efficiency of the dc/ac inverter is optimized according to the input impedance, ZIN, of the PT with an optimal load termination.
Because the PTs are low-power devices, the general requirements for the applications of the PTs include low-power, low cost, and high efficiency. It is important to reduce the number of inductive components and switches in amplifier or dc/ac inverter designs for PT applications. High-voltage piezoelectric transformers have been adopted by power electronic engineers and researchers worldwide. A complete inverter with HVPT for CCFL or neon lamps was built, and the experimental results are presented. However, design issues such as packaging, thermal effects, amplifier circuits, control methods, and matching between amplifiers and loads need to be explored further.Ph. D.
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Khanna, Mudit. "Design of DC-DC converters using Tunable Piezoelectric Transformers". Thesis, Virginia Tech, 2017. http://hdl.handle.net/10919/86442.
Testo completoAbstract (sommario):
This thesis introduces the ‘tunable’ piezoelectric transformers (TPT) which provide an extra control terminal, used in this case, to regulate the output voltage. A detailed mathematical analysis is done on the electrical equivalent circuit of the TPT to understand the effect of control terminal loading on the circuit performance. Based on this analysis, a variable capacitor connected across the control terminal is proposed to regulate the output voltage for line and load variations is suggested. The concept of ‘tunability’ in a TPT is introduced and mathematical conditions are derived to achieve the required ‘tunability’. This analysis can help a TPT designer to design the TPT for a specific application and predict the load and line regulations limits for a given design.
A circuit implementation of the variable capacitor, intended for control, is presented. With the proposed control circuit design, the effective value of a fixe capacitor can be controlled by controlling the duty cycle of a switch. Hence, this enables pulse width modulated (PWM) control for the TPT based converter operating at a constant frequency. Fixed frequency operation enables a high efficiency operation of TPT near its resonant frequency and the complete secondary control requires no isolation in the voltage feedback and control circuit. This prevents any ‘cross-talk’ between primary and secondary terminals and reduces the component count. The design of series input inductor for achieving zero voltage switching (ZVS) in the inverter switches for the new control is also discussed.
Experimental results for two different TPT designs are presented. Their differences in structure and its effect on the circuit performance has been discussed to support the mathematical analysis.Master of Science
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Turner, John Andrew. "A New Approach to Wide Bandwidth Energy Harvesting for Piezoelectric Cantilever Based Harvesters". Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/19301.
Testo completoAbstract (sommario):
This thesis proposes a control system to widen the bandwidth of piezoelectric transducers (PZTs) for vibration energy harvesting while extracting maximum power. A straightforward complex conjugate match achieves maximum power transfer only at a single frequency while requiring an impractically large inductance. The proposed system intends to address these problems. It incorporates a bi-directional DC/DC converter with feed-forward control to achieve a complex conjugate match over a wide range of frequencies. Analysis of the proposed system and simulation results are presented to verify validity of the proposed method.Master of Science
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Su, Yu-Hao. "Power Enhancement of Piezoelectric Technology based Power Devices by Using Heat Transfer Technology". Thesis, Cachan, Ecole normale supérieure, 2014. http://www.theses.fr/2014DENS0025/document.
Testo completoAbstract (sommario):
L’objectif de cette étude est d’améliorer les performances des transformateurs piézoélectriques en terme de courant de sortie et de puissance pour des applications d’alimentation DC/DC, grâce à la gestion de l’échauffement. Le courant de sortie des transformateurs piézoélectriques, et donc la puissance transmise, sont directement liés à la vitesse de vibration qui pour des valeurs élevées engendre des pertes et une forte élévation de température. Cette élévation excessive de la température a comme conséquence le changement des caractéristiques du transformateur et plus particulièrement la diminution du facteur de qualité Q. Ainsi cela entraine une limite structurelle de la puissance transmise du transformateur. Une solution pour augmenter le courant de sortie est l’utilisation d’un redresseur doubleur de courant, qui grâce à 2 inductances permet, à courant de charge donné, de diminuer la vitesse de vibration du transformateur, mais ne permet pas de régler le problème d’échauffement du transformateur. Dans cette thèse nous proposons des moyens d’évacuation de la chaleur ainsi que le choix de l’environnement dans lequel le transformateur devra fonctionner. L’influence de différents systèmes de refroidissement d’un convertisseur DC/DC à base transformateur piézoélectrique est étudiée. L’étude thermique du transformateur piézoélectrique multicouche polarisé en épaisseur et ayant des électrodes circulaires met en évidence un comportement non linéaire. Une plaque vibrante piézoélectrique est d’abord envisagée pour créer un flux d’air qui augmente l’évacuation de chaleur par convection, puis un module de refroidissement utilisant l’effet thermoélectrique. Les mesures montrent que la première solution est plus avantageuse car elle améliore sensiblement les performances du transformateur pour un coût énergétique très faible. Une étude thermique par éléments finis complète cette étude, montrant que l’approche par schéma électrique est pertinente. La puissance que peut délivrer le transformateur sur une charge optimale est encore augmentée. Enfin, ce travail montre qu’en combinant les dispositifs de refroidissement tout en respectant la condition de température inférieure à 55°C, le rendement du convertisseur reste raisonnable (70%) et la puissance disponible peut doubler dans le meilleur des casThe objective of this study was to increase the output current and power in a piezoelectric transformer (PT) based DC/DC converter by adding a cooling system. It is known that the output current of PT is limited by temperature build-up because of losses especially when driving at high vibration velocity. Excessive temperature rise will decrease the quality factor Q of piezoelectric component during the operational process. Simultaneously the vibration energy cannot be increased even if under higher excitation voltage. Although connecting different inductive circuits at the PT secondary terminal can increase the output current, the root cause of temperature build-up problem is not solved.This dissertation presents the heat transfer technology to deal with the temperature build-up problem. With the heat transfer technology, the threshold vibration velocity of PT can be increased and thus the output current and output power (almost three times).Furthermore, a comparison between heat transfer technology and current-doubler rectifier applied to the piezoelectric transformer based DC/DC converter was also studied. The advantages and disadvantages of the proposed technique were investigated. A theoretical-phenomenological model was developed to explain the relationship between the losses and the temperature rise. It will be shown that the vibration velocity as well as the heat generation increases the losses. In our design, the maximum output current capacity can increase 100% when the operating condition of PT temperature is kept below 55°C. The study comprises of a theoretical part and experimental proof-of-concept demonstration of the proposed design method
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Du, Sijun. "Energy-efficient interfaces for vibration energy harvesting". Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/270359.
Testo completoAbstract (sommario):
Ultra low power wireless sensors and sensor systems are of increasing interest in a variety of applications ranging from structural health monitoring to industrial process control. Electrochemical batteries have thus far remained the primary energy sources for such systems despite the finite associated lifetimes imposed due to limitations associated with energy density. However, certain applications (such as implantable biomedical electronic devices and tire pressure sensors) require the operation of sensors and sensor systems over significant periods of time, where battery usage may be impractical and add cost due to the requirement for periodic re-charging and/or replacement. In order to address this challenge and extend the operational lifetime of wireless sensors, there has been an emerging research interest on harvesting ambient vibration energy. Vibration energy harvesting is a technology that generates electrical energy from ambient kinetic energy. Despite numerous research publications in this field over the past decade, low power density and variable ambient conditions remain as the key limitations of vibration energy harvesting. In terms of the piezoelectric transducers, the open-circuit voltage is usually low, which limits its power while extracted by a full-bridge rectifier. In terms of the interface circuits, most reported circuits are limited by the power efficiency, suitability to real-world vibration conditions and system volume due to large off-chip components required. The research reported in this thesis is focused on increasing power output of piezoelectric transducers and power extraction efficiency of interface circuits. There are five main chapters describing two new design topologies of piezoelectric transducers and three novel active interface circuits implemented with CMOS technology. In order to improve the power output of a piezoelectric transducer, a series connection configuration scheme is proposed, which splits the electrode of a harvester into multiple equal regions connected in series to inherently increase the open-circuit voltage generated by the harvester. This topology passively increases the rectified power while using a full-bridge rectifier. While most of piezoelectric transducers are designed with piezoelectric layers fully covered by electrodes, this thesis proposes a new electrode design topology, which maximizes the raw AC output power of a piezoelectric harvester by finding an optimal electrode coverage. In order to extract power from a piezoelectric harvester, three active interface circuits are proposed in this thesis. The first one improves the conventional SSHI (synchronized switch harvesting on inductor) by employing a startup circuitry to enable the system to start operating under much lower vibration excitation levels. The second one dynamically configures the connection of the two regions of a piezoelectric transducer to increase the operational range and output power under a variety of excitation levels. The third one is a novel SSH architecture which employs capacitors instead of inductors to perform synchronous voltage flip. This new architecture is named as SSHC (synchronized switch harvesting on capacitors) to distinguish from SSHI rectifiers and indicate its inductorless architecture.
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Wang, Chun-Hung, e 王峻鴻. "Design and Implementation of Adaptive Switched-Capacitor Step-Down DC-DC Converter for Piezoelectric Energy Harvesting". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/69837545646540311716.
Testo completoAbstract (sommario):
碩士朝陽科技大學
資訊工程系
102
A closed-loop scheme of adaptive switched-capacitor converter (ASCC) is presented by combining a phase generator and non-overlapping circuit to realize the switched-capacitor-based (SC) step-down conversion for piezoelectric energy harvesting. In the power part of ASCC, there are two cascaded sub-circuits including: (i) Front: the bridge rectifier and a filter capacitor (Ci), and (ii) Core: 5-stage serial-parallel SC step-down converter and an output capacitor (Co). By using the front bridge rectifier, it converters the AC source of piezoelectric device into the DC source, and then harvests the energy to store in the filter capacitor Ci for building the DC supply Vs. The core 5-stage serial-parallel SC converter can provide 5 different step-down voltages (V_s/5,V_s/4,V_s/3,V_s/2,V_s), and with the help of the phase generator, perform an adaptive charging operation stage by stage (from the lower voltage to the higher one) for the protection of the battery load. Finally, the closed-loop ASCC is designed by OrCAD Pspice, and simulated for some cases: steady-state and dynamic responses (source/loading variation). Finally, we realize the implemental circuit, and all results are illustrated to show the efficacy of the proposed scheme.
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Chen, I.-Chou, e 陳怡舟. "A Single-Inductor Triple-Input Dual-Output DC-DC Converter for Photovoltaic and Piezoelectric Energy Harvesting Systems". Thesis, 2017. http://ndltd.ncl.edu.tw/handle/9qc3ey.
Testo completoAbstract (sommario):
碩士國立中正大學
電機工程研究所
105
This thesis presents a single-inductor triple-input dual-output(SI-TIDO) dc-dc converter for photovoltaic and piezoelectric energy harvesting systems. The SI-TIDO dc-dc converter uses buck-boost topology and can operate in continuous or discontinuous current modes that enhance the operation range of the converter. A new algorithm is proposed to share single inductor between all the inputs and outputs in one switch cycle. This algorithm determines light-load or heavy-load mode by current mode pulse width modulation control. Compared with conventional algorithms the proposed one saves a pair of compensator and mode detection circuits. Apart from regulating the output voltage to power the loading circuits, the converter also clamps the photovoltaic voltage to the maximum power point value. The fractional open-circuit voltage method is realized to track maximum power points by the capacitance divider circuit. Leakage reduction sample switch is used to extend the hold time of voltages. The peak efficiency of the proposed SI-TIDO buck-boost converter is 86.6%. The sampling cycle of the capacitance divider circuit is around 1.05 s. Each sampling takes 256 μs. Besides, a delay lock loop based zero-current detector(ZCD) is proposed. The proposed ZCD uses a delay lock loop to lock the time of pre-activation . Therefore, the power of proposed ZCD is lower full-time operation ZCD. The transient response of the ZCD is also faster than one point judgment ZCD because the ZCD have 100ns tolerance range.
Capitoli di libri sul tema "Piezoelectric DC-DC converter"
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Dallago, Enrico, Daniele Miatton, Giuseppe Venchi, Valeria Bottarel, Giovanni Frattini, Giulio Ricotti e Monica Schipani. "Comparison of Two Autonomous AC-DC Converters for Piezoelectric Energy Scavenging Systems". In IFIP Advances in Information and Communication Technology, 61–80. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-12267-5_4.
Testo completo
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K. Sidhu, Rajdevinder, Jagpal S. Ubhi e Alpana Agarwal. "RF Energy-based Smart Harvesting Systems". In Emerging Technologies and Applications for a Smart and Sustainable World, 23–40. BENTHAM SCIENCE PUBLISHERS, 2022. http://dx.doi.org/10.2174/9789815036244122010005.
Testo completoAbstract (sommario):
Energy and the environment have both become a matter of concern among researchers worldwide. There are several forms of energy present in the environment; therefore, utilizing these resources is preferred. In the modern world, the evolution of energy harvesting has received a lot of attention. Various energy harvesting topologies like solar, vibrational, piezoelectric, RF (radio frequency), etc., are available, but RF energy harvesting has a bright future in generating a small amount of electric power that drives various power-constrained electronic devices due to its easy availability and self-sustainability. The circuitry, which converts RF energy into DC output, is termed the rectenna unit of the model. The rectenna unit consists of receiving antenna followed by the matching network and rectifier. The aim of this chapter is to provide a detailed review of various technical aspects of radio frequency energy harvesting, which have been showing a great proliferation in the designing of the RF energy harvesting model. Comparative analysis of different topologies of each aspect is also performed.
Atti di convegni sul tema "Piezoelectric DC-DC converter"
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Saboor, Abdullah, Yuetao Hou e Khurram K. Afridi. "Control Strategy for a Merged Switched-Capacitor Piezoelectric Resonator-Based DC-DC Converter Enabling Output Regulation at Fixed Frequency". In 2024 IEEE Workshop on Control and Modeling for Power Electronics (COMPEL), 1–7. IEEE, 2024. http://dx.doi.org/10.1109/compel57542.2024.10613969.
Testo completo
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Gonon-Mathieu, Baptiste, Lucas de Araujo Pereira, Adrien Morel, Theo Lamorelle, Yasser Moursy, Frédéric Rothan, Ghislain Despesse e Gaël Pillonnet. "Piezoelectric DC-DC Converters Benchmark in Power Management Integrated Circuit Context". In 2024 22nd IEEE Interregional NEWCAS Conference (NEWCAS), 89–93. IEEE, 2024. http://dx.doi.org/10.1109/newcas58973.2024.10666352.
Testo completo
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Touhami, Mustapha, Harrison Liew e Jessica D. Boles. "Phase-Shift Voltage Regulation of DC-DC Converters Based on Piezoelectric Resonators". In 2024 IEEE Workshop on Control and Modeling for Power Electronics (COMPEL), 1–8. IEEE, 2024. http://dx.doi.org/10.1109/compel57542.2024.10614015.
Testo completo
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Pollet, Benjamin, Francois Costa e Ghislain Despesse. "A new inductorless DC-DC piezoelectric flyback converter". In 2018 IEEE International Conference on Industrial Technology (ICIT). IEEE, 2018. http://dx.doi.org/10.1109/icit.2018.8352243.
Testo completo
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Liu, Yuan-Ping, Dejan Vasic, Francois Costa, Wen-Jong Wu e Denis Schwander. "Fixed frequency controlled piezoelectric 10W DC/DC converter". In 2010 IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 2010. http://dx.doi.org/10.1109/ecce.2010.5618375.
Testo completo
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Su, Y. H., Y. P. Liu, D. Vasic, F. Costa, W. J. Wu e C. K. Lee. "Power improvement of piezoelectric transformer based DC/DC converter". In IECON 2012 - 38th Annual Conference of IEEE Industrial Electronics. IEEE, 2012. http://dx.doi.org/10.1109/iecon.2012.6388749.
Testo completo
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Wanyeki, Babuabel M., Jessica D. Boles, Jeffery H. Lang e David J. Perreault. "Two-Stage Piezoelectric Resonator / Switched Capacitor DC-DC Converter". In 2023 IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 2023. http://dx.doi.org/10.1109/ecce53617.2023.10362388.
Testo completo
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Ng, Elaine, Jessica D. Boles, Jeffrey H. Lang e David J. Perreault. "Non-Isolated DC-DC Converter Implementations Based on Piezoelectric Transformers". In 2021 IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 2021. http://dx.doi.org/10.1109/ecce47101.2021.9595412.
Testo completo
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Vasic, Dejan, Yuan-Ping Liu, Francois Costa e Denis Schwander. "Piezoelectric transformer-based DC/DC converter with improved burst-mode control". In 2013 IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 2013. http://dx.doi.org/10.1109/ecce.2013.6646693.
Testo completo
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TOUHAMI, Mustapha, Ghislain DESPESSE e Francois COSTA. "A New Topology of DC-DC Converter Based On Piezoelectric Resonator". In 2020 IEEE 21st Workshop on Control and Modeling for Power Electronics (COMPEL). IEEE, 2020. http://dx.doi.org/10.1109/compel49091.2020.9265767.
Testo completo