The Experts below are selected from a list of 597 Experts worldwide ranked by ideXlab platform
Faouzi Ben Ammar - One of the best experts on this subject based on the ideXlab platform.
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improved performance and energy management strategy for proton exchange membrane fuel cell Backup Battery in power electronic systems
International Journal of Hydrogen Energy, 2017Co-Authors: Kais Brik, Faouzi Ben AmmarAbstract:Abstract The objective of this paper is to propose an approach to analyze the reliability of proton exchange membrane fuel cell and Backup Battery in the power electronic systems by improving the strategy of energy management. This approach is based on the research of critical causes generating the degradation of power sources in the power electronic application and their undesirable effect. The analysis of potential failure modes that affect the fuel cell and the auxiliary source is developed by using analysis tools such as the Failure Mode and Effects Analysis (FMEA). The undesirable factors have to be taken into account in designing the topology of power converter in order to improve the performance of a fuel cell power system. In this context the authors propose to integrate a multiphase converter to minimize the current ripple and ameliorate the dynamic response of exchange membrane fuel cell. The improvement of Battery lifetime is also ensured by the incorporation of an appropriate charge cycle that promises the full state of charge and avoids the overcharge.
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Improved performance and energy management strategy for proton exchange membrane fuel cell/Backup Battery in power electronic systems
International Journal of Hydrogen Energy, 2017Co-Authors: Kais Brik, Faouzi Ben AmmarAbstract:Abstract The objective of this paper is to propose an approach to analyze the reliability of proton exchange membrane fuel cell and Backup Battery in the power electronic systems by improving the strategy of energy management. This approach is based on the research of critical causes generating the degradation of power sources in the power electronic application and their undesirable effect. The analysis of potential failure modes that affect the fuel cell and the auxiliary source is developed by using analysis tools such as the Failure Mode and Effects Analysis (FMEA). The undesirable factors have to be taken into account in designing the topology of power converter in order to improve the performance of a fuel cell power system. In this context the authors propose to integrate a multiphase converter to minimize the current ripple and ameliorate the dynamic response of exchange membrane fuel cell. The improvement of Battery lifetime is also ensured by the incorporation of an appropriate charge cycle that promises the full state of charge and avoids the overcharge.
Jorge R. Fernandes - One of the best experts on this subject based on the ideXlab platform.
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Energy harvesting circuit using integrated transformer
2011 IEEE International Symposium of Circuits and Systems (ISCAS), 2011Co-Authors: Hugo B. Gonçalves, Miguel A. Martins, Jorge R. FernandesAbstract:In this work we present a prototype circuit to harvest energy from radio frequency (RF) electromagnetic waves based on an integrated transformer together with a half-wave multi-stage rectifier. This circuit is designed to be impedance matched to a standard 50 Ω antenna and to operate at 2.4 GHz with input power as low as -15 dBm. The circuit presented here shows that it is possible to harvest low power input signals and therefore it can be used to supply alone a circuit, or to work as a Backup Battery charger. The circuit was designed and simulated in a standard 130 nm CMOS process.
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ISCAS - Energy harvesting circuit using integrated transformer
2011 IEEE International Symposium of Circuits and Systems (ISCAS), 2011Co-Authors: Hugo Goncalves, Miguel A. Martins, Jorge R. FernandesAbstract:In this work we present a prototype circuit to harvest energy from radio frequency (RF) electromagnetic waves based on an integrated transformer together with a half-wave multi-stage rectifier. This circuit is designed to be impedance matched to a standard 50 Ω antenna and to operate at 2.4 GHz with input power as low as −15 dBm. The circuit presented here shows that it is possible to harvest low power input signals and therefore it can be used to supply alone a circuit, or to work as a Backup Battery charger. The circuit was designed and simulated in a standard 130 nm CMOS process.
M.d. Manjrekar - One of the best experts on this subject based on the ideXlab platform.
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A reconfigurable uninterruptible power supply system for multiple power quality applications
Twentieth Annual IEEE Applied Power Electronics Conference and Exposition 2005. APEC 2005., 2005Co-Authors: M.d. ManjrekarAbstract:A novel topology of an uninterruptible power supply (UPS) system is presented in this paper. The proposed UPS system presents the advantages of high power conversion efficiency as well as active front-end filtering which ensures unity input power factor (reactive power compensation) and low input total harmonic distortion (harmonic power compensation) in the voltages and currents. In addition, this UPS possess dynamic voltage sag compensation capabilities, hence eliminates any series transformer or boost converter which is normally used in conjunction with traditional stand-alone UPS systems. Meanwhile, during the Backup (Battery) mode of operation, this UPS has the capability of providing grid isolation without any backward power feed into the faulted utility gird, thus eliminates the needs of circuit breaker or static switch. In addition, it has the desirable characteristics of making seamless transition from normal to Backup mode during power failures and vice versa, as well as providing controlled voltage charging at the dc bus link. The proposed UPS is also impervious to load variations, which enables it to operate under nonlinear load condition. Lastly, the circuit structure is simple, light weight, and can be implemented at a low cost using the standard commercial available components. A complete set of simulation as well as experimental results based on a 1 kW test prototype of the proposed UPS are presented here to demonstrate its viability and efficacy.
Abdulmohsen Al-lwaimi - One of the best experts on this subject based on the ideXlab platform.
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International Symposium on Emerging Inter-networks, Communication and Mobility (EICM 2014) A Tiny RSA Cryptosystem Based On Arduino Microcontroller Useful For Small Scale Networks
2020Co-Authors: Qasem Abu Al-haija, Mashhoor Al Tarayrah, Hasan Al-qadeeb, Abdulmohsen Al-lwaimiAbstract:RSA Cryptography is a well-known example of public key cryptographic algorithms that involves robust encryption/decryption processes. In this paper, a microcontroller based RSA is designed and proposed. Arduino Mega2560R3 microcontroller supported with external memory and a screen touch LCD as well as a double keypad has been used under the programming of C language to implement the proposed RSA coprocessor with 32 bits. It was found that the trade of between message size and the encryption time can be drawn as a liner relationship according to the block size of the encryption phase. However, such design with a MCU provided with a small solar cell (and off course with a Backup Battery) as well as small block sizes is considered useful for the use in wireless sensor network (WSN) applications due to the ease of connecting the MCU to the WSN which as well avoid the processing time of encryption/decryption processes that could be executed by the MCU instead of the life limited sensors.
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FNC/MobiSPC - A Tiny RSA Cryptosystem based on Arduino Microcontroller Useful for Small Scale Networks
Procedia Computer Science, 2014Co-Authors: Qasem Abu Al-haija, Mashhoor Al Tarayrah, Hasan Al-qadeeb, Abdulmohsen Al-lwaimiAbstract:Abstract RSA Cryptography is a well-known example of public key cryptographic algorithms that involves robust encryption/decryption processes. In this paper, a microcontroller based RSA is designed and proposed. Arduino Mega2560R3 microcontroller supported with external memory and a screen touch LCD as well as a double keypad has been used under the programming of C language to implement the proposed RSA coprocessor with 32 bits. It was found that the trade of between message size and the encryption time can be drawn as a liner relationship according to the block size of the encryption phase. However, such design with a MCU provided with a small solar cell (and off course with a Backup Battery) as well as small block sizes is considered useful for the use in wireless sensor network (WSN) applications due to the ease of connecting the MCU to the WSN which as well avoid the processing time of encryption/decryption processes that could be executed by the MCU instead of the life limited sensors.
Paul Brokaw - One of the best experts on this subject based on the ideXlab platform.
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ISSCC - 21.3 A 200nA single-inductor dual-input-triple-output (DITO) converter with two-stage charging and process-limit cold-start voltage for photovoltaic and thermoelectric energy harvesting
2016 IEEE International Solid-State Circuits Conference (ISSCC), 2016Co-Authors: Yanfeng Lu, Bin Shao, Paul BrokawAbstract:Energy harvesting has been considered to be a good solution to power many IoE applications [1–3]. Some applications require regulated supply voltage, while on the other hand, any extra energy should be stored in the storage element, such as a rechargeable Battery, to maximize the total system efficiency. As the power delivery density is small in the energy-harvesting application, using a single inductor to transfer the power from the harvester to multiple outputs is achievable and efficient. The DITO architecture has three outputs as shown in Fig. 21.3.1: one is the regulated voltage output REG_OUT, the second is the unregulated voltage output SYS and the third is the rechargeable Battery BAT. Due to the unpredictable environment conditions, the harvester could be in an environment without a corresponding energy source available for a long time. In order to keep the system operation without the harvester input VIN, the Backup Battery at BACK_UP is necessary, which would be the second power input of the system. The control scheme should make sure the Backup Battery only delivers power to the system when necessary in order not to waste any energy in the Backup Battery.
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21.3 A 200nA single-inductor dual-input-triple-output (DITO) converter with two-stage charging and process-limit cold-start voltage for photovoltaic and thermoelectric energy harvesting
2016 IEEE International Solid-State Circuits Conference (ISSCC), 2016Co-Authors: Yanfeng Lu, Bin Shao, Paul BrokawAbstract:Energy harvesting has been considered to be a good solution to power many IoE applications [1-3]. Some applications require regulated supply voltage, while on the other hand, any extra energy should be stored in the storage element, such as a rechargeable Battery, to maximize the total system efficiency. As the power delivery density is small in the energy-harvesting application, using a single inductor to transfer the power from the harvester to multiple outputs is achievable and efficient. The DITO architecture has three outputs as shown in Fig. 21.3.1: one is the regulated voltage output REG_OUT, the second is the unregulated voltage output SYS and the third is the rechargeable Battery BAT. Due to the unpredictable environment conditions, the harvester could be in an environment without a corresponding energy source available for a long time. In order to keep the system operation without the harvester input VIN, the Backup Battery at BACK_UP is necessary, which would be the second power input of the system. The control scheme should make sure the Backup Battery only delivers power to the system when necessary in order not to waste any energy in the Backup Battery.