The Experts below are selected from a list of 4461 Experts worldwide ranked by ideXlab platform
M. Afendi M. Piah - One of the best experts on this subject based on the ideXlab platform.
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Pulsed electric field by Cascaded H-bridge multilevel inverter for liquid Food Sterilization
2016 IEEE International Conference on Power and Energy (PECon), 2016Co-Authors: M. Afendi M. Piah, Hanifah Jambari, Naziha Ahmad Azli, Norulhuda Ismail, Jamilah AhmadAbstract:This paper focuses on evaluating the effectiveness of a Cascaded H-bridge Multilevel Inverter (CHMI) based pulsed power supply for liquid Food Sterilization using pulsed electric field (PEF). The utilization of the CHMI allows the system to produce PEF with high stability, less heat and power consumption if compared to the conventional methods such as pulsed forming network (PFN) or transmission line techniques. The CHMI pulsed power supply can attaining high output voltage without using a transformer to meet specification necessities for sterilizing liquid Food. By using the CHMI, the power loses due to omission of winding coil can be reduced. A MATLAB/Simulink software has been used to simulate the effectiveness of a 5-level CHMI circuit in order to generate PEF output pulses with pulse width 1 ms and at constant frequency of a 50 Hz. The simulation and experimental results indicate that, an output voltage up to 4.52 kV p-p and maximum output power of 348 W have been generate with the values fulfil the pulse requirements for liquid Food Sterilization applications. Most importantly, the CHMI has been operated with less power consumption if compared with conventional method that can prove to be beneficial in terms of lowering its cost and size particularly for industrial application to inactivate various type of microbial.
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Implementation of cascaded H-bridge multilevel inverter for liquid Food Sterilization using pulsed electric field
2014 IEEE Conference on Energy Conversion (CENCON), 2014Co-Authors: Naziha Ahmad Azli, Hanifah Jambari, M. Afendi M. Piah, Politeknik Ibrahim Sultan, Pasir Gudang, Nur Huda RamlanAbstract:This paper presents on evaluating a performance of Cascaded H-bridge Multilevel Inverter (CHMI) pulsed power supply, which can produce high-voltage output pulses and electric field strength for effective inactivation of microbes in liquid Food Sterilization process. The unique feature of the CHMI allows the system to produce bipolar square wave pulses with less power consumption and high stability compared to an exponential decay pulse (EDP) and oscillatory decay pulse (ODP) in liquid Food Sterilization. The CHMI pulsed power supply can achieving high output voltage without using a transformer while fulfilling the requirements specification for sterilizing an identified liquid Food. This in turn can reduce the power losses due to omission of winding coil as well as reduce cost. The experimental results on the 7-level CHMI indicate that, output voltage and electric field strength up of 2.0 kVp-p and 10 kV/cm respectively have been produced with both values meeting the pulse specifications for liquid Food Sterilization applications particularly for inactivation of Saccharomyces cerevisiae in orange juice.
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Bipolar Square Wave Pulses for Liquid Food Sterilization using Cascaded H-Bridge Multilevel Inverter
International Journal of Electrical and Computer Engineering, 2011Co-Authors: Hanifah Jambari, Naziha Ahmad Azli, M. Afendi M. PiahAbstract:This paper presents the generation of bipolar square wave pulses with characteristics that are suitable for liquid Food Sterilization using a Cascaded H-bridge Multilevel Inverter (CHMI). Bipolar square waves pulses have been reported as stable for a longer time during the Sterilization process with minimum heat emission and increased efficiency. The CHMI allows the system to produce bipolar square wave pulses and yielding high output voltage without using a transformer while fulfilling the pulse requirements for effective liquid Food Sterilization. This in turn can reduce power consumption and cost of the overall liquid Food Sterilization system. The simulation results have shown that pulses with peak output voltage of 2.4 kV, pulse width of between 1 μs and 1 ms at frequencies of 50 Hz and 100 Hz can be generated by a 7-level CHMI. Results from the experimental set-up based on a 5-level CHMI has indicated the potential of the proposed circuit in producing bipolar square wave output pulses with peak values that depends on the DC source level supplied to the CHMI modules, pulse width of between 12.5 μs and 1 ms at frequencies of 50 Hz and 100 Hz. Keywords—pulsed electric field, multilevel inverter, bipolar square wave, Food Sterilization
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COMPARISON OF PULSED ELECTRIC FIELD GENERATION TECHNIQUES FOR MICROBIAL INACTIVATION APPLICATION
Journal of theoretical and applied information technology, 2011Co-Authors: Hanifah Jambari, Naziha Ahmad Azli, M. Afendi M. PiahAbstract:This paper presents a comparative study on various pulsed electric field (PEF) techniques for liquid Food Sterilization applications. Pulsed Electric Field (PEF) is an alternative method compared to the conventional Food pasteurization method in removing harmful bacteria contained in liquid Food products. A Cascaded Multilevel Inverter (CHMI) is proposed as a PEF generator to produce a higher output voltage without using a transformer to inactivate microbial in liquid Food. It will reduce the power losses of the system while yielding better Sterilization effectiveness as well as reduce cost. The CHMI has been simulated using MATLAB/Simulink software to analyze the performance of the circuit. The simulation results demonstrate that the CHMI can produce both bipolar and unipolar square wave output pulses. This in turn contributes to the flexibility of the CHMI in testing the effectiveness of the PEF produced on liquid Food Sterilization compared to the conventional method and other power electronics circuits that have been used for similar application.
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Simulation of Cascaded H-Bridge Multilevel Inverter for liquid Food Sterilization with various distance of the electrodes gap
2011 IEEE Symposium on Industrial Electronics and Applications, 2011Co-Authors: Hanifah Jambari, M. Afendi M. Piah, Naziha Ahmad AzliAbstract:This paper presents the simulation results of the Cascaded H-Bridge Multilevel Inverter (CHMI) with various distance of the electrodes gap in liquid Food Sterilization using pulsed electric field (PEF). The utilization of the difference gap between the electrodes allow the system to reduce the applied voltage of the HVDC power supply, while fulfilling the requirements for effective liquid Food Sterilization. Thus it can reduce power consumption and will reduce cost. In this paper, the CHMI circuit has been simulated using MATLAB/Simulink and the distance of the electrodes gap has been simulated using Quickfield simulation software. Peak output voltage 1.2 kV, 2.4 kV and 6 kV with gap distance 0.1 cm, 0.2 cm and 0.5 cm respectively has been obtained in which the values can produce electric field strength of up to 12 kV/cm. All of the specifications meet the requirements for liquid Food Sterilization, particularly inactivate saccharomyces cerevisiae spoilage microorganisms in pineapple juice.
Yaowming Chen - One of the best experts on this subject based on the ideXlab platform.
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Wide Pulse Combined With Narrow-Pulse Generator for Food Sterilization
IEEE Transactions on Industrial Electronics, 2008Co-Authors: S Y Tseng, Yaowming ChenAbstract:This paper proposes a wide pulse combined with a narrow-pulse generator for solid-Food Sterilization. The proposed generator is composed of a full-bridge converter in phase-shift control to generate a high dc-link voltage and a full-bridge inverter associated with an L-C network and a transformer to generate wide pulses combined with narrow pulses. These combined pulses can prevent undesired strong air arcing in free space, reduce power consumption, and save power components, while sterilizing Food effectively. The converter and inverter can be operated at high frequencies and with pulse width-modulation control; thus, its weight and size can be reduced significantly, and its efficiency can correspondingly be improved. Experimental results obtained from a prototype with plusmn10-kV wide pulses combined with plusmn10-kV narrow pulses and with 10- to 50-kW peak output power, depending on pulsewidth of the output pulses, have demonstrated its feasibility.
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narrow pulsed voltage generator for liquid Food Sterilization
Applied Power Electronics Conference, 2006Co-Authors: S Y Tseng, Yaowming ChenAbstract:This paper first reviews mechanism and waveform consideration for liquid Food Sterilization, and then presents how to generate bipolar narrow pulses. In this research, a bidirectional flyback converter with energy recovery circuits is proposed to generate bipolar narrow pulsed electric fields for liquid Food Sterilization, which includes Sterilization of drinking water, alcoholic beverages, fruit juice, etc. Since in the converter, leakage inductance is around 1% of the magnetizing inductance, capacitors are used to resonate with the leakage inductor to recover the trapped energy and to reduce switching loss, improving efficiency about 13%. In addition, the energy recovery capacitor can reduce voltage stress significantly. Experimental results obtained from a prototype with the output of /spl plusmn/6 kV /spl plusmn/20 kV, depending on loads, and peak power of 250 kW have confirmed these discussions.
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Analysis and design of a soft-switching interleaved forward converter for generating pulsed electric fields
2003Co-Authors: S Y Tseng, Chin-feng Lee, Yaowming ChenAbstract:This paper presents analysis and design of a soft-switching interleaved forward converter for generating pulsed electric fields to process microbes, which includes Food Sterilization, waste treatment, pollution control, and medical diagnostics and treatment. Particularly, in the Food Sterilization, it only causes a little increase in temperature, providing safe, nutritious and fresh quality of Food for consumers. To achieve Sterilization, the pulse-width of the pulsed electric field varies from tens of ns to hundreds of /spl mu/ s, the period changes from 0.1 to 1 ms and the electric field intensity is from tens to hundreds of kV/cm. In this study, sterilizing waveforms are long pulses stacked with narrow pulses to prevent undesired gas discharge and reduce power consumption. A converter equipped with an interleaving scheme is proposed to generate the pulses. Thus, the converter can operate at high frequencies, its weight and size can be reduced significantly, and its efficiency can be correspondingly improved. Hardware measurements of /spl plusmn/10 kV pulses and 200 W peak power have demonstrated the feasibility of the proposed converter.
Alexander Mathys - One of the best experts on this subject based on the ideXlab platform.
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continuous versus discontinuous ultra high pressure systems for Food Sterilization with focus on ultra high pressure homogenization and high pressure thermal Sterilization a review
Comprehensive Reviews in Food Science and Food Safety, 2018Co-Authors: Robert Sevenich, Alexander MathysAbstract:High‐pressure thermal Sterilization (HPTS) and ultra‐high‐pressure homogenization (UHPH) are two emerging Sterilization techniques that have not been implemented in the Food industry yet. The two technologies apply different acting principles as HPTS uses isostatic pressure in combination with heat whereas UHPH uses dynamic pressure in combination with shear stress, cavitation, impingement, and heat. Both technologies offer significant benefits in terms of spore inactivation in Food production with reduced thermal intensity and minimized effects on sensory and nutritional profiles. These benefits have resulted in relevant research efforts on both technologies over the past few decades. This state of the art of the discontinuous HPTS‐based and the continuous UHPH‐based Sterilization concepts are assessed within this review. Further, various basic principles and promising future preservation applications of HPTS and UHPH for Food processing, that are also applicable in the pharmaceutical, biochemical, and biotechnological sectors, are summarized. In addition, the applications and limitations of these technologies in terms of optimizations needed to overcome the identified challenges are emphasized.
Hanifah Jambari - One of the best experts on this subject based on the ideXlab platform.
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Pulsed electric field by Cascaded H-bridge multilevel inverter for liquid Food Sterilization
2016 IEEE International Conference on Power and Energy (PECon), 2016Co-Authors: M. Afendi M. Piah, Hanifah Jambari, Naziha Ahmad Azli, Norulhuda Ismail, Jamilah AhmadAbstract:This paper focuses on evaluating the effectiveness of a Cascaded H-bridge Multilevel Inverter (CHMI) based pulsed power supply for liquid Food Sterilization using pulsed electric field (PEF). The utilization of the CHMI allows the system to produce PEF with high stability, less heat and power consumption if compared to the conventional methods such as pulsed forming network (PFN) or transmission line techniques. The CHMI pulsed power supply can attaining high output voltage without using a transformer to meet specification necessities for sterilizing liquid Food. By using the CHMI, the power loses due to omission of winding coil can be reduced. A MATLAB/Simulink software has been used to simulate the effectiveness of a 5-level CHMI circuit in order to generate PEF output pulses with pulse width 1 ms and at constant frequency of a 50 Hz. The simulation and experimental results indicate that, an output voltage up to 4.52 kV p-p and maximum output power of 348 W have been generate with the values fulfil the pulse requirements for liquid Food Sterilization applications. Most importantly, the CHMI has been operated with less power consumption if compared with conventional method that can prove to be beneficial in terms of lowering its cost and size particularly for industrial application to inactivate various type of microbial.
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Implementation of cascaded H-bridge multilevel inverter for liquid Food Sterilization using pulsed electric field
2014 IEEE Conference on Energy Conversion (CENCON), 2014Co-Authors: Naziha Ahmad Azli, Hanifah Jambari, M. Afendi M. Piah, Politeknik Ibrahim Sultan, Pasir Gudang, Nur Huda RamlanAbstract:This paper presents on evaluating a performance of Cascaded H-bridge Multilevel Inverter (CHMI) pulsed power supply, which can produce high-voltage output pulses and electric field strength for effective inactivation of microbes in liquid Food Sterilization process. The unique feature of the CHMI allows the system to produce bipolar square wave pulses with less power consumption and high stability compared to an exponential decay pulse (EDP) and oscillatory decay pulse (ODP) in liquid Food Sterilization. The CHMI pulsed power supply can achieving high output voltage without using a transformer while fulfilling the requirements specification for sterilizing an identified liquid Food. This in turn can reduce the power losses due to omission of winding coil as well as reduce cost. The experimental results on the 7-level CHMI indicate that, output voltage and electric field strength up of 2.0 kVp-p and 10 kV/cm respectively have been produced with both values meeting the pulse specifications for liquid Food Sterilization applications particularly for inactivation of Saccharomyces cerevisiae in orange juice.
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Bipolar Square Wave Pulses for Liquid Food Sterilization using Cascaded H-Bridge Multilevel Inverter
International Journal of Electrical and Computer Engineering, 2011Co-Authors: Hanifah Jambari, Naziha Ahmad Azli, M. Afendi M. PiahAbstract:This paper presents the generation of bipolar square wave pulses with characteristics that are suitable for liquid Food Sterilization using a Cascaded H-bridge Multilevel Inverter (CHMI). Bipolar square waves pulses have been reported as stable for a longer time during the Sterilization process with minimum heat emission and increased efficiency. The CHMI allows the system to produce bipolar square wave pulses and yielding high output voltage without using a transformer while fulfilling the pulse requirements for effective liquid Food Sterilization. This in turn can reduce power consumption and cost of the overall liquid Food Sterilization system. The simulation results have shown that pulses with peak output voltage of 2.4 kV, pulse width of between 1 μs and 1 ms at frequencies of 50 Hz and 100 Hz can be generated by a 7-level CHMI. Results from the experimental set-up based on a 5-level CHMI has indicated the potential of the proposed circuit in producing bipolar square wave output pulses with peak values that depends on the DC source level supplied to the CHMI modules, pulse width of between 12.5 μs and 1 ms at frequencies of 50 Hz and 100 Hz. Keywords—pulsed electric field, multilevel inverter, bipolar square wave, Food Sterilization
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COMPARISON OF PULSED ELECTRIC FIELD GENERATION TECHNIQUES FOR MICROBIAL INACTIVATION APPLICATION
Journal of theoretical and applied information technology, 2011Co-Authors: Hanifah Jambari, Naziha Ahmad Azli, M. Afendi M. PiahAbstract:This paper presents a comparative study on various pulsed electric field (PEF) techniques for liquid Food Sterilization applications. Pulsed Electric Field (PEF) is an alternative method compared to the conventional Food pasteurization method in removing harmful bacteria contained in liquid Food products. A Cascaded Multilevel Inverter (CHMI) is proposed as a PEF generator to produce a higher output voltage without using a transformer to inactivate microbial in liquid Food. It will reduce the power losses of the system while yielding better Sterilization effectiveness as well as reduce cost. The CHMI has been simulated using MATLAB/Simulink software to analyze the performance of the circuit. The simulation results demonstrate that the CHMI can produce both bipolar and unipolar square wave output pulses. This in turn contributes to the flexibility of the CHMI in testing the effectiveness of the PEF produced on liquid Food Sterilization compared to the conventional method and other power electronics circuits that have been used for similar application.
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Simulation of Cascaded H-Bridge Multilevel Inverter for liquid Food Sterilization with various distance of the electrodes gap
2011 IEEE Symposium on Industrial Electronics and Applications, 2011Co-Authors: Hanifah Jambari, M. Afendi M. Piah, Naziha Ahmad AzliAbstract:This paper presents the simulation results of the Cascaded H-Bridge Multilevel Inverter (CHMI) with various distance of the electrodes gap in liquid Food Sterilization using pulsed electric field (PEF). The utilization of the difference gap between the electrodes allow the system to reduce the applied voltage of the HVDC power supply, while fulfilling the requirements for effective liquid Food Sterilization. Thus it can reduce power consumption and will reduce cost. In this paper, the CHMI circuit has been simulated using MATLAB/Simulink and the distance of the electrodes gap has been simulated using Quickfield simulation software. Peak output voltage 1.2 kV, 2.4 kV and 6 kV with gap distance 0.1 cm, 0.2 cm and 0.5 cm respectively has been obtained in which the values can produce electric field strength of up to 12 kV/cm. All of the specifications meet the requirements for liquid Food Sterilization, particularly inactivate saccharomyces cerevisiae spoilage microorganisms in pineapple juice.
S Y Tseng - One of the best experts on this subject based on the ideXlab platform.
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Wide Pulse Combined With Narrow-Pulse Generator for Food Sterilization
IEEE Transactions on Industrial Electronics, 2008Co-Authors: S Y Tseng, Yaowming ChenAbstract:This paper proposes a wide pulse combined with a narrow-pulse generator for solid-Food Sterilization. The proposed generator is composed of a full-bridge converter in phase-shift control to generate a high dc-link voltage and a full-bridge inverter associated with an L-C network and a transformer to generate wide pulses combined with narrow pulses. These combined pulses can prevent undesired strong air arcing in free space, reduce power consumption, and save power components, while sterilizing Food effectively. The converter and inverter can be operated at high frequencies and with pulse width-modulation control; thus, its weight and size can be reduced significantly, and its efficiency can correspondingly be improved. Experimental results obtained from a prototype with plusmn10-kV wide pulses combined with plusmn10-kV narrow pulses and with 10- to 50-kW peak output power, depending on pulsewidth of the output pulses, have demonstrated its feasibility.
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Bipolar Narrow-Pulse Generator With Energy-Recovery Feature for Liquid-Food Sterilization
IEEE Transactions on Industrial Electronics, 2008Co-Authors: S Y TsengAbstract:This paper presents a bipolar narrow-pulse generator with energy-recovery feature for liquid-Food Sterilization. The generator is formed from a bidirectional flyback converter and active-clamp circuits which are further simplified to the proposed topology with the synchronous-switch technique. In the converter, the leakage inductance of the transformer will resonate with the active-clamp capacitors to recover the trapped energy and to reduce switching loss, improving efficiency by about 13%. In addition, the capacitors can reduce voltage stress significantly. Experimental results obtained from a prototype with the output of plusmn6-20 kV, depending on loads, and the peak power of 1.2 MW has confirmed these discussions.
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narrow pulsed voltage generator for liquid Food Sterilization
Applied Power Electronics Conference, 2006Co-Authors: S Y Tseng, Yaowming ChenAbstract:This paper first reviews mechanism and waveform consideration for liquid Food Sterilization, and then presents how to generate bipolar narrow pulses. In this research, a bidirectional flyback converter with energy recovery circuits is proposed to generate bipolar narrow pulsed electric fields for liquid Food Sterilization, which includes Sterilization of drinking water, alcoholic beverages, fruit juice, etc. Since in the converter, leakage inductance is around 1% of the magnetizing inductance, capacitors are used to resonate with the leakage inductor to recover the trapped energy and to reduce switching loss, improving efficiency about 13%. In addition, the energy recovery capacitor can reduce voltage stress significantly. Experimental results obtained from a prototype with the output of /spl plusmn/6 kV /spl plusmn/20 kV, depending on loads, and peak power of 250 kW have confirmed these discussions.
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Analysis and design of a soft-switching interleaved forward converter for generating pulsed electric fields
2003Co-Authors: S Y Tseng, Chin-feng Lee, Yaowming ChenAbstract:This paper presents analysis and design of a soft-switching interleaved forward converter for generating pulsed electric fields to process microbes, which includes Food Sterilization, waste treatment, pollution control, and medical diagnostics and treatment. Particularly, in the Food Sterilization, it only causes a little increase in temperature, providing safe, nutritious and fresh quality of Food for consumers. To achieve Sterilization, the pulse-width of the pulsed electric field varies from tens of ns to hundreds of /spl mu/ s, the period changes from 0.1 to 1 ms and the electric field intensity is from tens to hundreds of kV/cm. In this study, sterilizing waveforms are long pulses stacked with narrow pulses to prevent undesired gas discharge and reduce power consumption. A converter equipped with an interleaving scheme is proposed to generate the pulses. Thus, the converter can operate at high frequencies, its weight and size can be reduced significantly, and its efficiency can be correspondingly improved. Hardware measurements of /spl plusmn/10 kV pulses and 200 W peak power have demonstrated the feasibility of the proposed converter.