This document summarizes a student project to design a commercially feasible LED driver circuit that uses less than 15 watts of power. The project aims to create a circuit with 90% efficiency, 0.9 power factor, and the lowest possible cost. It will explore buck converter and capacitive power supply topologies, with buck converter selected for its higher efficiency and reliability for low voltages. The team will use a VIPer22A IC to control the switching frequency of the buck converter. Their work aligns with UN Sustainable Development Goal 9 of promoting sustainable industrialization through innovative research.

1. Title of the Project
Commercially Feasible LED
Driver Circuit (<15 Watt)
Name ID
Md. Ragib Noor (Chair*) 021 151 093
Tofael Ahmmed (Recorder*) 021 151 103
Md. Tawhid Hasan (Member) 021 151 010
Md. Mohiuddin Parvez (Member) 021 151 097
Group Members:

2. Introduction
LED (Light emitting diode) lightings are gaining more and
more attention in the household and industrial uses. It is
becoming more popular because it has a long life and it does
not have any mercury poison effect compared to the
conventional fluorescent lamps.

3. Motivation & problem statement
• All parts have to be imported
• Government is losing money
• Increasing efficiency
• Increase operating lifetime
• Reducing power loss

4. Aim of the project
Purpose a model with
• 90% efficiency
• 0.9 power factor
• Lowest possible costing
• Increase sustainability
• Reducing power losses

5. Led driver
• Led bulbs require good controlling of voltage
and current
• Led drivers regulates the power flow among
the led panel
• The power level of the LED is maintained
constant by the LED driver

6. Literature Review
1. High-Efficiency Dimmable LED Driver
2. LED driver circuit with PWM output
3. Useful Life of an LED Driver
4. Power-efficient LED-current sensing circuit

7. Major Topologies
• Capacitive power supply
• Fly back
• Buck

8. Capacitive Power Supply
Advantages:
• Low cost
Disadvantages:
• Affects power factor
• Only for low power devices
• No electric isolation

9. Fly-back Converter
Advantages:
• Low cost
• Fast transient response
• Low parts count
Disadvantages:
• Low efficiency
• High heat dissipate
• Pf low

10. Buck Converter
Advantages:
• 1. its step downs the voltage easily
• 2. Its is more reliable.
• 3. It can maintain higher power factor and higher
efficiency.
Disadvantages:
• Ripple voltage high,
• peak current also high.

11. Working principle
• Supply 220 Volt AC
• Convert AC-to-DC using rectifier
• Step down voltage using buck converter
• An IC (VIPer22A) controls the converter’s
switching frequency

12. VIPer22A

13. Method
• Identifying the problem
• Understanding the problem
• Limitations
• Design Specifications
• Establishment of design strategy
• Appropriate Approach
• Buck converter topology is most efficient and
reliable for low voltage applications.

14. Method (Cont.)
•Understanding basic laws
•Understanding VIPer22A
•Setting up preliminary circuit
•Trial and Error check
•Performance Test

15. Trial and Error
Performance
test

16. Sustainable Development Goals
Our Project:
● Collaborating with industry
● Innovative project
Goal 9 Targets:
• Promote sustainable
industrialization
• Enhance scientific research
• Upgrade the technological
capabilities of industrial
sectors

17. PO Mapping
Engineering
Knowledge
Applied formula
Problem analysis
Analyzed market, and different
aspects
Design/development
of solutions
Develop the existing models
Investigation
Instigating the problem
Modern tool usage
Simulation software and modern
measurement equipment
The engineer and
society
contextual knowledge for the benefit
of the people of our society

18. PO Mapping
Environment and
sustainability
Safety for environment
Ethics
Following code of conduct
Individual work and
teamwork
Divided the tasks individually and
merging the tasks as a team
Communication
Report and presentation
Project management
and finance
Managing the project and finance
Life-long learning
Future broadest the context of the
project

19. Gantt chart

20. Future outcome of led driver
• Much higher levels of efficiency will become
the norm
• More accurate power monitoring
• Better performance
• Reducing the chip size

21. Limitation
• Only for low power

22. Conclusion