Jaber A. Abu Qahouq

University of Alabama, Tuscaloosa, Alabama, United States

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Publications (68)53.32 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: Abstract-this paper introduces a full comparative evaluation of the advanced PV architectures especially for energy harvest application. The comparative evaluation involves module architecture, sub-module architecture, and cell architecture. The comparison includes the capability of theses PV architectures to mitigate the effect of the mismatch loss that inherently comes from different irradiation on the PV system. Then, the effect of the bypass diodes on the PV performance under these three architectures is also considered.
    Telecommunications Energy Conference (INTELEC), 2014 IEEE 36th International; 09/2014
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    ABSTRACT: This paper presents the design of an on-chip integrated power management architecture with Maximum Power Point Tracking (MPPT) for Photovoltaic (PV) solar system. The system is developed in order to extract higher power for PV system under partial shading and other mismatching conditions. The MPPT circuit is implemented in 0.35μm Complementary Metal–Oxide–Semiconductor (CMOS) technology. The on-chip system utilizes a high-efficiency synchronous DC-DC boost power converter and analog Ripple Correlation Control (RCC) circuit for MPPT control. The 2400μm×5000μm developed Integrated Circuit (IC) is connected to a solar cell with 0.5V nominal output voltage and 5A output current. A peak efficiency of 92% is achieved. The design of the power stage and analog RCC MPPT algorithm circuit are presented and examined in this paper.
    applied power electronics conference APEC; 03/2014
  • Eman Goma, Mohamed Orabi, E.-S. Hasaneen, Jaber Abu Qahouq
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    ABSTRACT: This paper presents the design and HSPICE simulation results of an on-chip integrated Single-OutputSensor Maximum Power Point Tracking (SOS MPPT) PV solar system architecture. The cell-level on-chip integrated analog SOS MPPT circuit is designed to track the maximum power point of PV system under different conditions including changes in irradiation levels. The MPPT circuit is implemented using 0.35μm CMOS technology. Results are presented for a two PV solar cells connected in series and exposed to different solar irradiation levels, which show the ability of each cell to extract its MPP. The proposed cell-level integrated system is a step forward to overcome the effects of mismatches and/or partial shading phenomena in PV solar systems which affects efficiency. In addition, the system cost is reduced as a result of using one MPPT controller with only one sensor for N-cell PV solar system with cell-level MPPT control.
    Applied Power Electronics Conference and Exposition (APEC), Fort Worth, TX; 03/2014
  • Zhigang Dang, Jaber A. Abu Qahouq
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    ABSTRACT: Lateral misalignment between the transmitter (Tx) and receiver (Rx) in a wireless power transfer (WPT) system significantly reduces its power transmission efficiency. This paper first investigates the lateral misalignment in the magnetic resonance coupled (MRC) WPT system and identifies the High Efficiency Range (HER). The HER is a high efficiency area on the transmission efficiency versus Rx lateral misalignment amount curve. In the HER, the transmission efficiency is nearly constant at a maximum value before it sharply drops down to zero (or a very small value). The identification of the HER is verified by simulation results obtained from a developed ANSYS® HFSS® 3-D physical model. Simulation results of the ANSYS® HFSS® 3-D physical model with 5-turn, 60cm outer diameter spiral shape MRC-WPT system show that when the vertical distance (DIS) between the Tx and Rx ranges from 0.1 m to 1 m, an HER exists at each DIS value. When 0.3m ≤ DIS ≤ 0.6m, nearly constant high efficiency of ~90% could be maintained when the lateral misalignment is not larger than 50cm (83.3% of the Rx diameter).
    2014 IEEE Applied Power Electronics Conference and Exposition - APEC 2014; 03/2014
  • Jaber Abu Qahouq, Yuncong Jiang, Wangxin Huang
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    ABSTRACT: The paper presents a Maximum Power Point Tracking (MPPT) controller for a multi-channel (N-Channel) Photovoltaic (PV) solar system which requires only one voltage sensor and no current sensors. The N-channel Load Voltage Single-Sensor MPPT (LV-SS-MPPT) controller is able to track the MPP of each solar panel using only one output voltage value in the N-channels and is able to provide a very good tradeoff between size, cost, and tracking speed. Compared to a conventional N-channel MPPT system which requires N voltage sensors, N current sensors, 2N ADCs (or an ADC with 2N channels) and N MPPT controllers along with the associated conditioning circuitries, the proposed method only requires one voltage sensor, one ADC and one MPPT controller and is able to converge closer to the maximum lower power point of the load when the channels of the system are subject to non-uniform and/or mismatching conditions.
    2014 IEEE Applied Power Electronics Conference and Exposition - APEC 2014; 03/2014
  • Wangxin Huang, Jaber A. Abu Qahouq
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    ABSTRACT: This paper presents a distributed battery energy storage architecture where the cells in the battery pack are decoupled from each other by connecting each cell with a lower power (smaller) DC-DC power converter. In addition to providing voltage regulation for the DC bus, these small DC-DC power converters are utilized to achieve state of charge (SOC) balancing among the cells by employing a proposed charge balancing controller that is based on energy sharing concept. As a result, no additional charge balancing circuits and controllers are needed in order to transfer charges between the cells of the battery pack. A system simulation model based on the proposed energy storage system architecture is developed in Matlab®/Simulink® in order to verify the feasibility and functionality of the proposed charge balancing controller.
    2014 IEEE Applied Power Electronics Conference and Exposition - APEC 2014; 03/2014
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    ABSTRACT: This paper presents an integrated power conditioning converter for photovoltaic application, where a maximum power point tracker (MPPT) is used in order to maximize the harvested power. Ripple correlation control technique is used to extract the maximum power from the cell. The power conditioning system (PCS) in this paper uses a single cell structure. The integrated converter incorporated in the PCS is based on the buck-boost topology to enhance the photovoltaic system performance especially in very low irradiation conditions. Simulation results using H-Spice are presented in this paper in order to verify the operation and its principle.
    Telecommunications Energy Conference (INTELEC), 2013 IEEE 35th International-Germany; 10/2013
  • Yuncong Jiang, J.A.A. Qahouq, T.A. Haskew
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    ABSTRACT: This paper presents a load-current-based maximum power point tracking (MPPT) digital controller with an adaptive-step-size and adaptive-perturbation-frequency algorithm. Only one sensor is needed in the controller circuitry since the MPPT controller is only utilizing the load current information. By utilizing a variable step-size algorithm, the speed, accuracy, and efficiency of the PV system MPPT are improved when compared to the fixed step-size load-current-based algorithm. Furthermore, the proposed adaptive algorithm utilizes a novel variable perturbation frequency scheme which further improves the controller speed. The concept and operation of the load-current adaptive-step-size and adaptive-perturbation-frequency MPPT controller are presented, analyzed, and verified by results obtained from a proof-of-concept experimental prototype.
    IEEE Transactions on Power Electronics 07/2013; 28(7):3195-3205. · 5.73 Impact Factor
  • Jaber A. Abu Qahouq, VaraPrasad Arikatla
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    ABSTRACT: A switching power-converter closed-loop online autotuning controller is presented in this paper. The presented controller is based on tuning the closed-loop-compensator parameters by simply observing the compensated-error-signal time-domain characteristics. Moreover, the presented online autotuning controller does not require the knowledge of the power-stage frequency response, does not depend on any conventional rule-of-thumb control-design criteria such as gain and phase margins, can be used without interrupting the normal operation of the power converter, and is relatively simple when compared to other methods particularly those that require measuring the frequency response of the power stage or closed-loop converter system. The online autotuning controller is presented in this paper based on a dc-dc buck switching converter with a fully digital closed-loop controller, as an example and not for limitation.
    IEEE Transactions on Industrial Electronics 05/2013; 60(5):1747-1758. · 6.50 Impact Factor
  • Yuncong Jiang, Jaber A. Abu Qahouq, Mohamed Orabi
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    ABSTRACT: Photovoltaic solar systems with Module Integrated Converters (MICs) that are connected in series are getting more attention for the ability to create high output voltage while performing Maximum Power Point Tracking (MPPT) function for individual solar panels. Conventionally, MPPT controller is utilized for each solar panel or channel in this in series connection architecture, which results in cost increase. This paper presents a series-output-connection MPPT (SOC-MPPT) controller for multiple solar panels using a single current sensor and a single digital controller. It is suited when the load is constant voltage (e.g. battery) or is resistive. The proposed controller is investigated based on boost type MICs. Experimental results under steady-state conditions and transient conditions are presented to verify the performance of the proposed controller.
    2013 IEEE Applied Power Electronics Conference and Exposition - APEC 2013; 03/2013
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    ABSTRACT: A PV solar system architecture with Multi-Input Single-Inductor power converter and Maximum Power Point Tracking (MPPT) control (MISI-MPPT) is presented in the paper. A multi-input single-inductor (MISI) power converter topology is used to interface multiple PV panels or cells with the load in the PV system. A digital controller is used to operate the MISI power converter in discontinuous conduction mode (DCM) and perform MPPT for each individual PV input. The result is reduced cost and size of the system while achieving high tracking efficiency. Simulation model is developed by using Matlab(r)/Simulink(r) software package and simulation results are obtained and presented in this paper.
    Telecommunications Energy Conference 'Smart Power and Efficiency' (INTELEC), Proceedings of 2013 35th International; 01/2013
  • Zhigang Dang, Jaber A. Abu Qahouq
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    ABSTRACT: This paper presents a power inductor with toroid core that utilizes a Permanent Magnet (PM) in its gap (PMTPI) in order to increase saturation current while keeping the same size and inductance. After discussing the PMTPI structure, the results of ANSYS®/Maxwell® physical model simulation results for a design example are presented. The design example considered in this paper is for a toroid-core power inductor with dimensions of 12.5mm × 12.5mm × 6.5mm and inductance of ∼592nH. The saturation current is increased from 14A in the conventional design to 28A in the proposed design.
    Applied Power Electronics Conference and Exposition (APEC), 2013 Twenty-Eighth Annual IEEE; 01/2013
  • Wangxin Huang, J.A. Abu Qahouq
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    ABSTRACT: This paper presents a scheme to manually tune a digital Proportional-Integral (PI) controller (TunePI scheme) to achieve optimized dynamic performance of a DC-DC power converter. Based on a previously proposed compensated-error-signal-based auto-tuning of compensator gain to achieve optimized gain for a given set of other compensator parameters, i.e. zero(s) and pole(s), the paper presents a new scheme that will tune the complete set of a PI compensator parameters to result in a design with an optimum set of parameters for improved dynamic performance. This paper focuses on discussing the TunePI scheme and presenting theoretical and experimental results that employ the TunePI scheme to manually tune a digital PI compensator. This will be used as the base for a future work to develop a controller that is able to auto-tune the PI compensator during the power converter operation (online auto-tuning).
    Applied Power Electronics Conference and Exposition (APEC), 2013 Twenty-Eighth Annual IEEE; 01/2013
  • Zhigang Dang, Jaber A. Abu Qahouq
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    ABSTRACT: Power inductor is one of the largest and most weighted components in power converters. On-chip power inductor with high saturation current and a relatively large inductance value is desired to be with a smaller size (footprint) [1-5]. Coupled power inductor (CPI) has many applications, and one of them is in multi-phase power converters [6-10]. One of the main advantages of the CPI used in DC-DC power converters is the ability to obtain smaller equivalent transient inductance (advantageous for lower output voltage dynamic deviation under transients) with a larger equivalent steady-state inductance (advantageous for smaller steady-state output voltage ripple and higher power efficiency). Inversely coupled power inductor was employed in the multi-phase switching power converters to improve both the steady-state and transient performances [8-10].
    Telecommunications Energy Conference 'Smart Power and Efficiency' (INTELEC), Proceedings of 2013 35th International; 01/2013
  • Wangxin Huang, Jaber A. Abu Qahouq
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    ABSTRACT: An automatic calibration method for a previously proposed sensorless adaptive voltage positioning (SLAVP) controller is presented in this article. The SLAVP scheme achieves AVP control without the need for current sensing and sampling required by conventional AVP schemes. However, the accuracy of the SLAVP control scheme is sensitive to the power path equivalent DC resistance value, R<sub align="right"> eq </sub>. An automatic calibration method is developed in this article in order to calibrate the SLAVP control law when R<sub align="right"> eq </sub> varies as a result of components aging or component replacement after initial design, for examples. The theoretical basis of the automatic calibration method is presented along with proof-of-concept experimental results for verification.
    International Journal of Power Electronics 01/2013; 5(3/4):248 - 261.
  • V.P. Arikatla, J.A. Abu Qahouq
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    ABSTRACT: An adaptive digital proportional-integral-derivative (AD-PID) controller scheme is presented in this study to improve the dynamic performance of power converters. The controller adaptively adjusts the integral constant (Ki) and the proportional constant (Kp) following a new control law. The control law is a function of the magnitude change in the error signal and its peak value during dynamic transients. The proposed AD-PID controller adaptively detects the peak value of the error signal, which is a function of the transient nature and magnitude and utilises it in the control law such that no oscillations are generated as a result of the adaptive operation. As a result, the dynamic output voltage deviation and the settling time of the output voltage are reduced. The concept and architecture of the proposed AD-PID are presented and its proposed control law is discussed and verified by experimental results obtained from a single-phase DC-DC buck converter with input voltage range of 8-10-V, nominal output voltage of 1.5-V and a maximum load current of 7-A.
    IET Power Electronics 03/2012; 5(3):341-348. · 1.32 Impact Factor
  • Journal of power electronics 01/2012; 12(1):98-103. · 0.75 Impact Factor
  • Wangxin Huang, J.A.A. Qahouq
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    ABSTRACT: A modified control scheme is presented in this paper to improve the load transient response of DC-DC power converter by utilizing a previously proposed auxiliary circuit which is capable of operating in both boost mode to discharge the output capacitor during load step down transient, and in buck mode to charge the output capacitor during load step up transient. The proposed modified control scheme for the auxiliary circuit is based on the output voltage peak detection, preset thresholds and zero crossing time information. This scheme achieves significant improvement in load transient response while eliminating the controller performance sensitivity to component values tolerances and complex calculations that could result in undesired transient response. A simulation model is built in MATLAB®/SIMULINK® software package to validate the functionalities and advantages of the proposed control scheme.
    Telecommunications Energy Conference (INTELEC), 2012 IEEE 34th International; 01/2012
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    ABSTRACT: Analog maximum power point tracking (MPPT) controller circuit for photovoltaic solar panels/cells is an attractive solution due to its low cost and simple implementation. The paper presents an analog Maximum Power Point Tracking (MPPT) controller for a Photovoltaic (PV) solar system that utilizes the load current to achieve maximum output power from the solar panel. Compared to the existing MPPT controller circuitry which requires multiplication of the sensed PV panel voltage and current to yield panel power, the cost and size of the proposed circuit are reduced. The tracking performance of the proposed MPPT controller is validated by simulation results. The proposed MPPT controller circuit can be further implemented by CMOS technology and fabricated on-chip to perform distributed maximum power point tracking (DMPPT) in PV system.
    01/2012;
  • Yuncong Jiang, J.A.A. Qahouq, M. Orabi
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    ABSTRACT: Mismatching effects are major drawbacks existing in today's photovoltaic (PV) solar systems. To improve power system stability and energy conversion efficiency, distributed maximum power point tracking (DMPPT) techniques are developed. In this paper, single-stage DMPPT power management DC-AC inverter architecture (SS-AC-DMPPT) is presented and verified by Matlab®/Simulink® simulation model results. In the SS-AC-DMPPT PV solar system architecture, multiple inverters are connected in series in order to yield higher AC output voltage to the load such as the grid, each inverter is directly connected to a PV solar panel or cell, and MPPT control is performed by each inverter.
    Telecommunications Energy Conference (INTELEC), 2012 IEEE 34th International; 01/2012

Publication Stats

250 Citations
53.32 Total Impact Points

Institutions

  • 2007–2013
    • University of Alabama
      • Department of Electrical and Computer Engineering
      Tuscaloosa, Alabama, United States
    • Intel
      Santa Clara, California, United States
  • 2001–2006
    • University of Central Florida
      • • Department of Electrical Engineering & Computer Science
      • • College of Engineering & Computer Science
      Orlando, Florida, United States