This document summarizes an interview with Shahbaz A. Khan. It includes information about his educational and professional background, including receiving a B.Eng. in electronic and electrical engineering from the University of Leeds. It also lists his areas of knowledge and skills, which include embedded systems, programming languages, and engineering topics. Finally, it provides details about his undergraduate project involving an interleaved buck-boost converter for a switched mode power supply.

1. Interview
(Shahbaz A. Khan)
SATEC – JMU Würzburg

2. Introduction
• Born in Peshawar, Pakistan.
• GCE O and A Levels (Cambridge University) in Pakistan.
• B.Eng. Electronic and Electrical Engineering, University of Leeds,
U.K. (First Class Honours ≈ 3.81/4.00 GPA).
• Around 4.5 years of diverse work experience. Worked in
Telematics (Masternaut), Power Distribution (USAID/PESCO),
Higher Education (LUMS) and Software/IT sectors (Afiniti).
• Likes: Electronics, Embedded Systems, ICT, Physics, Aerospace,
Learning/Exploring, Reading, International Affairs, Social/Political
Issues. Movies, Food and Entrepreneurship.
• Fluent in: English, Urdu/Hindi and Pashto languages.

3. Relevant Knowledge/Skills
• Semiconductor Physics/Technology.
• Electronic & Electrical Engineering.
• Embedded Systems (mainly Arduino & PIC, learning ARM).
• LabVIEW.
• MATLAB.
• C Programming.
• JavaScript (NodeJS) and HTML, CSS.
• EagleCad PCB.
• Teaching Experimental Physics labs at a university.
• Solar PV Systems.
• Aerospace, Automotive.
• Soldering, Lab Equipment.
• System Integration and Problem Solving.
• Writing, Communications, Management.

4. JWST Article
http://eacpe.org/james-webb-space-telescope/
Image Credit: NASA

5. B.Eng. Project
(Interleaved Buck-Boost Converter)
10%, 0.74
20%, 1.91
30%, 3.5
40%, 5.7
50%, 8.72
60%, 12.9
70%, 18.16
0
2
4
6
8
10
12
14
16
18
20
0% 10% 20% 30% 40% 50% 60% 70% 80%
Output
Voltage
Duty Ratio
Duty Ratio vs Output Voltage
Input Voltage = 10V
This project is a switched mode power supply for changing dc
voltage levels. A Pulse Width Modulated signal is used to switch
the MOSFETs that allow the energy storage elements to store or
discharge their energy accordingly. The duty cycle of that PWM
signal is determined by the value of an ADC input.
With interleaving, two buck-boost converters are connected in
parallel and the MOSFETs are switched with a 180ª phase
difference. The main advantages of interleaving are:
• A significantly reduced current ripple at the input and output.
• A significant reduction in inductor and capacitor sizes.
• Increased life-span of an input source such as a PV panel.
Input Voltage Range: 12-16Vdc
Output Voltage Range: 12-14Vdc
Maximum Output Current: 3A
Frequency of Operation: 20kHz
Ripple Magnitude: 5% of output current
Input
Voltage
DC-DC
Converter
Output
Voltage
The circuit efficiency is from 40-90%. Current ripple magnitudes
were significantly smaller compared to a single level buck-boost
converter.
0
10
20
30
40
50
60
70
80
90
100
0% 10% 20% 30% 40% 50% 60% 70% 80%
Efficiency
%age
Duty Cycle
Duty Cycle vs Efficiency for various Input Voltages
Vin=5V
Vin=7.5V
Vin=10V

6. Thank You!