- Nibong Tebal, Penang, Malaysia
Soib Taib
Universiti Sains Malaysia, Electrical and Electronic Engineering, Faculty Member
Research Interests:
In this paper, a hybrid-bridge LLC series resonant converter with low circulating current and reduced switching losses for on-board battery charging of plug-in electric vehicle (PEV) is presented. Full-bridge (FB) is utilized in LLC... more
In this paper, a hybrid-bridge LLC series resonant converter with low circulating current and reduced switching losses for on-board battery charging of plug-in electric vehicle (PEV) is presented. Full-bridge (FB) is utilized in LLC converter with narrow range switching frequency within below resonance frequency region for depleted battery charging. To cover the charging voltage range for deeply depleted battery, the converter operates using half-bridge (HB) in both above and below resonance frequency regions. For both modes, the converter uses two fixed voltage levels at input to keep the switching frequency in narrow range. MATAB Simulink is used to simulate the converter with 3 kW maximum output power. Simulation results show that the LLC converter covers the wide charging voltage range 100–420 V for deeply depleted to fully charged battery using the constant-current, constant-voltage (CC-CV) charging, having lower turn-off current of power switches and low circulating current in resonant tank.
Research Interests:
This presents an LLC resonant DC-DC converter for high output voltage applications. The proposed converter consists of four main parts which are a full bridge (FB) inverter, a resonant tank (LLC), a high voltage transformer (HVT) and a HV... more
This presents an LLC resonant DC-DC converter for high output voltage applications. The proposed converter consists of four main parts which are a full bridge (FB) inverter, a resonant tank (LLC), a high voltage transformer (HVT) and a HV bridge rectifier. The proposed converter can regulate the output voltage by narrowly varying the switching frequency. The LLC resonant circuit is utilized to retrieve the energy trapped in the leakage inductance of the transformer and to achieve the zero voltage switching (ZVS) feature. The resonant circuit also increases the conversion efficiency. A low power prototype of proposed converter is implemented to verify its benefits. The experimental results from the laboratory prototype are given to validate the operation of converter.
Research Interests:
This paper proposes a novel zero‐current‐switching series resonant high‐voltage DC–DC converter with reduced component count. The series resonant inverter in the proposed topology has two power switches (insulated‐gate bipolar... more
This paper proposes a novel zero‐current‐switching series resonant high‐voltage DC–DC converter with reduced component count. The series resonant inverter in the proposed topology has two power switches (insulated‐gate bipolar transistors, IGBTs), two resonant capacitors, and only one high‐voltage transformer (HVT) with center‐tapped primary windings. The power switches are connected in the form of a half‐bridge network. The leakage inductances of the transformer's primary windings together with the resonant capacitors form two series resonant circuits. The series resonant circuits are fed alternately by operating the power switches with interleaved half switching cycle. The secondary winding of the HVT is connected to a bridge rectifier circuit to rectify the secondary voltage. The converter operates in the discontinuous conduction mode (DCM) and its output voltage is regulated by pulse frequency modulation. Therefore, all the power switches turn on and off at the zero‐current switching condition. The main features of the proposed converter are its lower core loss, lower cost, and smaller size compared to previously proposed double series resonant high voltage DC–DC converters. The experimental results of a 130‐W prototype of the proposed converter are presented. The results confirm the excellent operation and performance of the converter. © 2016 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.
Research Interests:
In this paper, a LLC resonant DC-DC converter with voltage multiplier (VM) rectifier is proposed. The proposed converter circuit consists of four main components, which are the full bridge inverter, a resonant tank (LLC), a high voltage... more
In this paper, a LLC resonant DC-DC converter with voltage multiplier (VM) rectifier is proposed. The proposed converter circuit consists of four main components, which are the full bridge inverter, a resonant tank (LLC), a high voltage transformer, and a high voltage VM circuit. The proposed circuit regulates the output voltages by narrowly varying the switching frequency. The LLC resonant circuit is utilized to retrieve the energy trapped in the leakage inductance of the transformer and to achieve the zero voltage switching feature. The resonant circuit also increases the conversion efficiency. A high voltage transformer is used to step up the AC voltage, and then converted to DC voltage by rectifier. With the equivalent circuit derived based on the first harmonic approximation method, the input-output responses and the DC characteristics in the frequency domain are obtained. The key steady-state waveform and the circuit operation are presented. Finally, an example of the proposed LLC resonant converter with 50V input voltage and 6kV output voltage are simulated and validated by the experimental results.
Research Interests:
This paper presents a two stage battery charger for plug-in electric vehicles (PEV) based on half-bridge LLC series resonant converter (SRC) operating at resonance frequency. The first stage is power factor correction (PFC) stage... more
This paper presents a two stage battery charger for plug-in electric vehicles (PEV) based on half-bridge LLC series resonant converter (SRC) operating at resonance frequency. The first stage is power factor correction (PFC) stage comprising of boost converter topology using hysteresis band control of inductor current. The PFC stage reduces the total harmonic distortion (THD) of the line current for achieving high power factor and regulates the voltage to follow the battery voltage at DC link capacitor. The input of the boost converter is a single phase 50 Hz, 220V AC from grid. At the second stage, a half-bridge LLC-SRC is used for constant-current, constant-voltage (CC-CV) based battery charging and for providing galvanic isolation. The resonant converter is designed to operate around resonance frequency to have maximum efficiency and low turn-off current of power switches to reduce switching losses. The circuit is simulated using MATLAB Simulink with 1.5 kW maximum output power. Simulation results show that the PFC stage achieves THD less than 0.07% and high power factor value as 0.9976. The DC/DC stage meets all the CC-CV charging requirements of the battery over wide voltage range 320V-420V for depleted to fully charged battery.
Research Interests:
Research Interests:
Research Interests:
Research Interests:
ABSTRACT Infrared thermography is well known as one of the effective tools in monitoring the condition of electrical equipments. It has the capability to detect the thermal abnormality in electrical equipments. The recent research in this... more
ABSTRACT Infrared thermography is well known as one of the effective tools in monitoring the condition of electrical equipments. It has the capability to detect the thermal abnormality in electrical equipments. The recent research in this field has shown the interest on an auto-matic diagnosis system. This is due to fast analysis and robust compared to manual inspection. Various techniques have been used to identify and classify the thermal anomalies in the infrared thermographic image of electrical equipments. The common method that normally used in ana-lyzing infrared thermogram can be divided into four steps: image preprocessing, segmentation, classification and decision making. The majority of the techniques were implemented in bottom-up order. Conversely, another approach that is more top-down oriented has been introduced recently. This paper presents the review of image processing methods for both approaches in classifying the level of faults in electrical equipments. Some advantages and disadvantages of both approaches are also discussed.
ABSTRACT
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
ABSTRACT Infrared imaging is a commonly used tool for monitoring and assessing the thermal condition of electrical installations for ensuring a reliable power supply. However, the conventional evaluation approach is quite time consuming... more
ABSTRACT Infrared imaging is a commonly used tool for monitoring and assessing the thermal condition of electrical installations for ensuring a reliable power supply. However, the conventional evaluation approach is quite time consuming as the image is analyzed manually by a qualified personnel. Therefore, this paper proposed a fast thermal anomaly detection and classification based on qualitative infrared image analysis. First, regions of interest (ROIs) are semi-automatically selected by employing normalized cross correlation (NCC) for finding similar objects in the image. Statistical features are extracted from each detected region and classified using multilayer perceptron (MLP) neural network for determining the thermal condition of electrical equipment. The overall accuracy obtained by the proposed method is approximately 95 %, which is highly encouraging.
Research Interests:
Research Interests:
PurposeThe paper aims to develop a CAD tool power electronics converters.Design/methodology/approachIntegration of knowledge base techniques with OOP paradigm. Using Visual Basis class builder, 15 classes were built to form the kernel of... more
PurposeThe paper aims to develop a CAD tool power electronics converters.Design/methodology/approachIntegration of knowledge base techniques with OOP paradigm. Using Visual Basis class builder, 15 classes were built to form the kernel of the tool's KB.FindingsA knowledge‐based CAD tool was developed to ease the design of power electronics converters. It can be considered a learning aid tool too.Research limitations/implicationsThe knowledge base of developed tool can be expanded to accommodate large number of topologies. The GUI can be also ameliorated to a better look and interaction process.Practical implicationsWith proper enhancements, the purpose of the developed tool can be upgraded from educational one to industrial one.Originality/valueBeside the methodology, the new thing in the paper is the specificity of the application of the tool (i.e. in power electronics).
Research Interests:
Research Interests:
Research Interests:
Research Interests:
ABSTRACT
Research Interests:
The design of Transformer-less DC converter for low voltage and high current TEC applications is presented in this paper. The design of the converter was based on the combination of buck and boost converters topology. The prototype of the... more
The design of Transformer-less DC converter for low voltage and high current TEC applications is presented in this paper. The design of the converter was based on the combination of buck and boost converters topology. The prototype of the converter had been constructed and tested. The simulation results and measured data of the power circuit are analyzed and discussed. Maximum efficiency of the converter was 80% and therefore it is suitable to be connected with the TEC as a cooling system using solar power source
Research Interests:
Research Interests:
... Electric Cooling (TEC) Applications Wael Salah* , Soib Taib, Anwar Al-Mofleh School of Electrical and Electronic Engineering, Engineering Campus, Universiti Sains Malaysia, 14300 Nibong Tebal, Seberang Perai Selatan, Pulau Pinang,... more
... Electric Cooling (TEC) Applications Wael Salah* , Soib Taib, Anwar Al-Mofleh School of Electrical and Electronic Engineering, Engineering Campus, Universiti Sains Malaysia, 14300 Nibong Tebal, Seberang Perai Selatan, Pulau Pinang, Malaysia . Abstract ...
Road transport represents one of the greatest areas of challenge for energy efficiency. A growing percentage of petrol usage is due to consumption in the transportation sector. However, in other sectors, petrol has been recently partially... more
Road transport represents one of the greatest areas of challenge for energy efficiency. A growing percentage of petrol usage is due to consumption in the transportation sector. However, in other sectors, petrol has been recently partially or totally substituted by other fuels. The need for worldwide action to achieve energy efficiency in the transportation sector has been recognized by the agencies of the United Nations and other international governmental and non‐governmental organizations. Transportation is one of the key factors for the growth and development of Malaysian economy. Currently, more than 80% of primary energy consumption based on fossil fuels and demand stays high and is supposed continually grow in the future. Even if technology developments eventually able to reduce specific consumption, world energy demand is likely to increase in line with its population. This sector also accounts for a substantial amount of air pollution in cities and contributes significantly to greenhouse gas emissions. This paper aims to analyze factors influencing the pattern and emission level of energy consumption in the transportation sector of Malaysia and extrapolates the total energy demand and vehicular emissions.
Research Interests: Economics, United Nations, Energy Consumption, Air pollution, Applied Economics, and 16 moreTechnology development, Automotive Engineering, Transport, Transport policy, Energy demand, Fossil Fuels, Growth and development, Greenhouse Gas Emissions, Pollutants, Greenhouse Gas, Demand, Greenhouse gases, Fuel Consumption, Energy efficient, Gasoline, and Non Governmental Organization
Research Interests:
Research Interests:
Research Interests: Economics, United Nations, Energy Consumption, Air pollution, Applied Economics, and 16 moreTechnology development, Automotive Engineering, Transport, Transport policy, Energy demand, Fossil Fuels, Growth and development, Greenhouse Gas Emissions, Pollutants, Greenhouse Gas, Demand, Greenhouse gases, Fuel Consumption, Energy efficient, Gasoline, and Non Governmental Organization
Research Interests:
... A mathematical model of the drive system is simulated with MATLAB SIMULINK Toolbox and the reference design incorporates both hardware and software parts of the system. ... KeywordsüBLDC motor, sensorless control, simulation, dsPIC. ...
Research Interests:
Nowadays, in the fast changing phase of technology many countries have used photovoltaic (PV) to generate energy. PV modules are very versatile and easily fixed on the top of buildings, residential areas, and other structures. PV capable... more
Nowadays, in the fast changing phase of technology many countries have used photovoltaic (PV) to generate energy. PV modules are very versatile and easily fixed on the top of buildings, residential areas, and other structures. PV capable to produce a clean energy and it can be fixed up at location where the system grid not available. However, for producing optimum energy, PV modules must be mounted with correct PV direction and angle. The objective of this paper is to find out the correlation between difference PV angle and PV direction for maximum energy generation. The data have been collected through out a day. The measurement results on difference angles and direction of PV show that the voltage generates are quite similar. However the PV modules direct to north and south produced more power compared to east and west. The result of data collection is suitable for application in the Malaysia and similar environment.
Research Interests:
The main aim of this paper is to presents the development of low cost design for 35 W transformer less halogen lamp step down converter from 240 VAC to 12 VAC in stable output. This paper presents the methodology of solving the critical... more
The main aim of this paper is to presents the development of low cost design for 35 W transformer less halogen lamp step down converter from 240 VAC to 12 VAC in stable output. This paper presents the methodology of solving the critical problem and circuit design of a halogen dimmer without utilizing the isolation transformer. This approach increased the
Research Interests:
... A mathematical model of the drive system is simulated with MATLAB SIMULINK Toolbox and the reference design incorporates both hardware and software parts of the system. ... KeywordsüBLDC motor, sensorless control, simulation, dsPIC. ...
Research Interests:
A successful energy management control system using a personal computer (PC) is developed in this paper to avoid wastage of energy by human carelessness. A small residential building model is considered and a PC is used as a tool to... more
A successful energy management control system using a personal computer (PC) is developed in this paper to avoid wastage of energy by human carelessness. A small residential building model is considered and a PC is used as a tool to monitor the electrical system. Sensors are considered to monitor the number of persons entering or leaving and the computer system switch on/off the electrical equipment, and able to count the number of people in each room in the building. The system continue to count when more people enter the rooms. When all the peoples leave the rooms the system will switch off all the electrical equipments to make sure that there is no wastage of energy. This paper shows that energy savings is achieved in a building by having a proper interface using a PC with minimum hardware and software.
Research Interests:
This paper presents the development of an automatic voltage regulator (AVR) for synchronous generator in industries applications. The AVR operates as a voltage stabilizer and controller because the output voltage is controlled and... more
This paper presents the development of an automatic voltage regulator (AVR) for synchronous generator in industries applications. The AVR operates as a voltage stabilizer and controller because the output voltage is controlled and regulated through a power electronic system. It is observed that the automatic voltage regulator managed to achieve up to 2% voltage regulation at full load operation of
Research Interests:
The main aim of this paper is to presents the development of low cost design for 35 W transformer less halogen lamp step down converter from 240 VAC to 12 VAC in stable output. This paper presents the methodology of solving the critical... more
The main aim of this paper is to presents the development of low cost design for 35 W transformer less halogen lamp step down converter from 240 VAC to 12 VAC in stable output. This paper presents the methodology of solving the critical problem and circuit design of a halogen dimmer without utilizing the isolation transformer. This approach increased the
Research Interests:
The analysis and design of a star delta transformer in series with active power filter linked to grid lines are carried out. The development of active power filter which consists of voltage reference, triangular generator to generate... more
The analysis and design of a star delta transformer in series with active power filter linked to grid lines are carried out. The development of active power filter which consists of voltage reference, triangular generator to generate pulse width modulation with half inverters is simulated. The current injection network of half inverter in series with three phase of a star delta transformer which is interconnected to grid lines is also discussed. It is observed that the reduction of harmonics at grid lines was significantly reduced. The simulation results show that the total harmonic distortions are reduced within range of 45% - 50% and 97% - 99% at distributions and neutral lines respectively. Also, the distortions of sinusoidal waveform at grid lines were improved.