Junaidah Ali Mohd Jobran
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Preferred name
Junaidah Ali Mohd Jobran
Official Name
Ali Mohd Jobran, Junaidah
Alternative Name
Junaidah Ali Mohd Jobran,
Jobran, Junaidah Ali Mohd
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Scopus Author ID
55612070700
Researcher ID
CVW-3675-2022

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Numerical analysis of comparison highly efficient active rectifier for energy harvesting application

2023-08 , Liew Hui Fang , Diyya Hidayah Abd Rahman , Muhammad Izuan Fahmi Romli , Mohd Arif Mohd Zain , Junaidah Ali Mohd Jobran , Norhanisa Kimpol

A piezoelectric energy harvesting (PEH) circuit with a passive rectifier lack in efficiency and performance. The performance and potential of piezoelectric energy-harvesting devices depend strongly on the power conditioning circuit as the circuits are essential for managing and controlling energy flows in these energy collecting devices. In order to overcome this situation, the parallel synchronized switch harvesting on inductor (P-SSHI) and the general model of synchronized multiple bias-flip (SMBF) which are the recent implementation of parallel synchronized triple bias-flip (P-S3BF) and parallel synchronized septuple bias-flip (P-S7BF) are used for further enhancing the PEH performance. In addition, active rectifiers presented distinguished benefits over passive rectifiers, such as the ability to analyze regulation, dynamic response to load changes, output voltage ripple, input current, total harmonic distortion (THD), power factor correction, and wave factor. Furthermore, by using an active rectifier the output voltage can be boosted higher. Thus, it is more efficient than a lower voltage since it experiences less energy loss from resistance. This research investigates the several high efficiency AC-DC active rectifiers as interface circuit plays a crucial role in the energy harvesting capability enhancement in PEH systems. The research methodology is carried out on a piezoelectric structure under the same base circuit with a different type of power conditioning circuit applied to the main circuit using the LTspice software. In conclusion, the input voltage for each different active rectifier circuit were set at 3-5 V and the frequency is set based on the input voltage of the circuit. Based on the results, the P-S7BF shows the higher efficiency with voltage output will have the most efficiency with the estimated voltage output reaching up to 13 V with a net harvesting power of up to 80-90% follow up by the P-S3BF and P-SSHI. There are several recommendations to improve active circuit by investigation the impact of load variation on the efficiency, such as different loads may require different rectification techniques and control strategies to achieve high efficiency.

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Adaptive PD Controller Performance for Direct Cooling of Thermoelectric Refrigerator

2020-12-18 , Mohd Saifizi Saidon , Mohd Rizal Manan , Baseemah Mat Jalaluddin , Lee T.W. , Junaidah Ali Mohd Jobran , Roejhan Md Kawi , Mat Piah M.S. , Diana N.S. , Wan Azani Wan Mustafa

Refrigerator is the key component to keep the medicine and biological sample in the hospital. The domestic refrigerator has the problem of larger size and heavier weight since to the compact system like condenser, compressor, evaporator and expansion valve are assemble and using in the refrigerator. This project focused on design of temperature control of the portable thermoelectric refrigerator for medical purpose. Thermoelectric refrigerator is using the direct cooling method through thermoelectric module. Thermoelectric refrigerator has several advantages such as smaller size, lighter and silent when operated. Since maintain a constant temperature for the storage of medical product is important, a specific refrigerator is needed to ensure the medicine is stored in desired temperature. This project is to design and develop an adaptive control system which can perform a good temperature control for the thermoelectric refrigerator. The second order model is applied to design adaptive Proportional-Derivative (PD) controller. The selected controller is the adaptive PD controller because the performance of response shows 0.42 C of less steady state error and 0.21 C of lower undershoot. The adaptive PD control system designed able to let the refrigerator operate in different operating condition without influence the performance of the refrigerator.

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Solar powered multiple output buck converter

2020 , Muhammad Zaid Aihsan , Norhanisa Kimpol , Liew Hui Fang , Muhammad Izuan Fahmi Romli , Wan Azani Wan Mustafa , Junaidah Ali Mohd Jobran , Mohamed Mydin Hj M.Abdul Kader

Times have certainly changed over the past few decades, now it seems that technology is getting more compact and efficient. The modern outdoor enthusiast such as hikers, climbers has a problem regarding the lack of power supply to power up electronics when they go for adventure activities. In order to solve this problem, this paper design and develop DC/DC buck converter system to drop down the voltage from the solar photovoltaic (PV) system from 12VDC into 5VDC. This paper is first to start up with design and simulation circuit using simulation to test outcome of this paper in the range of 5VDC & 1.0A and 5VDC & 0.5A. A battery storage is needed to feed electricity independent and battery management of the battery is needed to improve the performance of battery life. This can be done by adding a charge controller unit. The outcome of this paper allows the battery to be charged using the solar panel and at the same time can produce multiple outputs for low voltages used. The software simulation has been done to shows this system produces two different output and the hardware will be developed based on the software results. Software and hardware result, both will be compared and analysed.

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Solar Powered Multiple Output Buck Converter

2020-12-18 , Muhammad Zaid Aihsan , Norhanisa Kimpol , Liew Hui Fang , Muhammad Izuan Fahmi Romli , Wan Azani Wan Mustafa , Junaidah Ali Mohd Jobran , Mohamed Mydin Hj M.Abdul Kader

Times have certainly changed over the past few decades, now it seems that technology is getting more compact and efficient. The modern outdoor enthusiast such as hikers, climbers has a problem regarding the lack of power supply to power up electronics when they go for adventure activities. In order to solve this problem, this paper design and develop DC/DC buck converter system to drop down the voltage from the solar photovoltaic (PV) system from 12VDC into 5VDC. This paper is first to start up with design and simulation circuit using simulation to test outcome of this paper in the range of 5VDC & 1.0A and 5VDC & 0.5A. A battery storage is needed to feed electricity independent and battery management of the battery is needed to improve the performance of battery life. This can be done by adding a charge controller unit. The outcome of this paper allows the battery to be charged using the solar panel and at the same time can produce multiple outputs for low voltages used. The software simulation has been done to shows this system produces two different output and the hardware will be developed based on the software results. Software and hardware result, both will be compared and analysed.

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Piezoelectric Array Configuration Technique into Enhance Power Catchment for Sound Energy Harvester System

2020-11-18 , Liew Hui Fang , Rosemizi Abd Rahim , Muhammad Izuan Fahmi Romli , Mohamad Zhafran Zakariya , Junaidah Ali Mohd Jobran , Norhanisa Kimpol

The objective of this study is to explore the harvest maximum output changes occurs in piezoelectric transducer when connected in different configuration to produce highest electricity consumption and generate sound energy harvesting system. Acoustic energy is a type of environmental energy source that can be extracted and converted into electrical energy for small-scale energy applications. In this study, the corresponding load resistance for single piezoelectric transducer is 4.5 k$\Omega$, together with a constant vibration source at a frequency of 68 Hz and a 1-g acceleration. The performance of output voltage and power of piezoelectric are evaluated and the optimum output is measured by depending on the connection of the piezoelectric transducer arrangement into series, parallel and series, and parallel which stimulated using Proteus software. The experiment result presented that, when have single piezo, 5 piezo connected in series, and 5 piezo connected in parallel, the output powers are 1.664 mW, 1.671mW and 7.676 mW, respectively. During the combination series and parallel connections, the output power of 3S1P piezo increases to 5.05mW. In a parallel configuration, the output voltage that produced is much higher than a piezoelectric transducer arrangement connected in series connection. The piezoelectric transducer that connected in parallel configurations increases its voltage output from 2.83 V to 13.05 V with the same polarity. The arrangement of piezoelectric transducer in parallel configuration is affordable, with its higher production of a higher power output compared to the arrangement of piezoelectric transducer in series connection. Whereas in terms of power output, the maximum power remains constant in the range of 1.665 to 1.671 mW when three transducers are in series configuration connection with the same polarity. In conclusion, the proper implementation of the piezoelectric array configuration is needed in order to operate the minimum energy for low load devices and promise to accomplish generated optimum power output in harvester system.

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