Zakir Ullah
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Research Subjects
Research Interests
Zakir Ullah has a total of 6 co-authors. Here are the top co-authors by number of shared publications:
- Ajmal Farooq
Department of Electrical Engineering, University of Engineering and Technology, Mardan 23200, Pakistan
1 shared publication - Fazal Muhammad
Department of Electrical Engineering, University of Engineering and Technology, Mardan, Pakistan
1 shared publication - Mian Muhammad Amir Ayaz
Department of Electrical Engineering, University of Engineering and Technology Mardan, Mardan 23200, Pakistan
1 shared publication - Mohammed Alqarni
Department of Electrical Engineering, College of Engineering, University of Business and Technology, Jeddah 21361, Saudi Arabia
1 shared publication - Muhammad I. Masud
Department of Electrical Engineering, College of Engineering, University of Business and Technology, Jeddah 21361, Saudi Arabia
1 shared publication - Muhammad Uzair Shah
Department of Electrical Engineering, University of Engineering and Technology Mardan, Mardan 23200, Pakistan
1 shared publication
Latest Publications
- Open Access
Design of a Novel Hybrid Switched-Inductor/Switched-Capacitor DC-DC Step-Up Converter
In this paper, a new topology of a step-up DC converter is presented for renewable energy applications, yielding a high step-up conversion ratio and reduced voltage stress across the switches. The proposed converter uses a hybrid switched-inductor and switched-capacitor cell to achieve the high voltage gain. Additionally, the capacitors in the switched cell also perform the function of clamping the voltage across switches. The proposed converter utilizes only a single controlled switch and operates in only two modes of conduction. The steady-state analysis and operating principle of the proposed hybrid step-up converter are discussed in detail and various mathematical equations have been derived. The analysis shows numerous improvements over the traditional DC-DC converters. Simulation was carried out in MATLAB Simulink 2021b on a 55% duty cycle and simulation results are compared with theoretical analysis. From simulation results, it is clear the proposed converter exhibits better performance compared to conventional boost and other traditional step-up converters with the same design parameters. Finally, a 31.5-watt hardware prototype was constructed and tested in the laboratory to experimentally validate the theoretical and simulation results.
Open AccessDesign of a Novel Hybrid Switched-Inductor/Switched-Capacitor DC-DC Step-Up Converter
In this paper, a new topology of a step-up DC converter is presented for renewable energy applications, yielding a high step-up conversion ratio and reduced voltage stress across the switches. The proposed converter uses a hybrid switched-inductor and switched-capacitor cell to achieve the high voltage gain. Additionally, the capacitors in the switched cell also perform the function of clamping the voltage across switches. The proposed converter utilizes only a single controlled switch and operates in only two modes of conduction. The steady-state analysis and operating principle of the proposed hybrid step-up converter are discussed in detail and various mathematical equations have been derived. The analysis shows numerous improvements over the traditional DC-DC converters. Simulation was carried out in MATLAB Simulink 2021b on a 55% duty cycle and simulation results are compared with theoretical analysis. From simulation results, it is clear the proposed converter exhibits better performance compared to conventional boost and other traditional step-up converters with the same design parameters. Finally, a 31.5-watt hardware prototype was constructed and tested in the laboratory to experimentally validate the theoretical and simulation results.