Pulse Width Modulation Final Year Project

Only available on StudyMode
  • Topic: Pulse-width modulation, Project management, Motor controller
  • Pages : 10 (2180 words )
  • Download(s) : 192
  • Published : March 25, 2013
Open Document
Text Preview
Chapter 1
Introduction

1.0 Background

Pulse Width Modulation (PWM) is a type of devices that can be used as a DC motor speed controller or light dimmer. PWM is used extensively for speed controller where power-saving application is needed. This device has been used as a motor speed control for small DC fans, for example in computer power supplies. A PWM circuits works by creating a square wave with a variable on-to-off ratio, the average on time may be varied from 0 to 100 duty cycle. The term duty cycle describes the proportion of 'on' time to the regular interval or 'period' of time; a low duty cycle corresponds to low power, because the power is off for most of the time. Duty cycle is expressed in percent, 100% being fully on. From this, a variable amount of power is transferred to the load. The main advantage of PWM is that power loss in the switching devices is very low. When the switch is off there is practically no current, and when it is on, there is almost no voltage drop across the switch. Power loss, being the product of voltage and current, is thus in both cases close to zero. PWM also works well with digital controls, which, because of their on/off nature, can easily set the needed duty cycle. Additional advantage of PWM is that the pulses reach the full supply voltage and will produce more torque in a motor by being able to overcome the internal motor resistance easily.

1.1 Objectives

The objectives of this project are:
1. To develop the actual circuit of the PWM.
2. To simulate the PWM circuit in simulation software.
3. To use the PWM in order to control the speed of the DC motor.

1.2 Methodology

Start

Title consideration, ideas

Supervisor approval

Components specifications and data sheets

Proposal Drafting

Proposal Evaluation

Project Simulation

Project Presentation

Progress Report Submission

END

Figure 1.2.1 Flowchart of Methodology

1.3 Gantt Chart
1.3.1 Final Year Project 1

  | WEEKS|
 ACTIVITY| 1| 2| 3| 4| 5| 6| 7| 8| 9| 10| 11| 12| 13| 14| 1| Student-supervisor-panel allocation, briefing about FYP, introductions|  |  | |  |  |  |  |  |  |  |  |  |  |  | 2| Student-supervisor meeting arrange time, finding ideas discuss ideas, project titles|  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3| Student-supervisor regular meeting|  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4| Proposal preparation|  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5| Proposal evaluation, meet supervisor for evaluation, things to be improved|  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6| Proposal correction correct any mistakes|  |  | |  |  |  |  |  |  |  |  |  |  |  | 7| Project Development choose circuit, check availability simulation|  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8| Proposal and progress presentation|  |  | |  |  |  |  |  |  |  |  |  |  |  | 9| Progress report writing is based on progress|  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10| Progress report submission submit report|  |  | |  |  |  |  |  |  |  |  |  |  |  |

1.3.2 Final Year Project 2

Week| 1| 2| 3| 4| 5| 6| 7| 8| 9| 10| 11| 12| 13| 14| Tasks| | | | | | | | | | | | | | |
Buy Components |  |  |  |  | | | | | | | | | | | Construct circuiton breadboard | | |  |  |  | | | | | | | | | | Troubleshoot| | |  |  |  | |  |  | | | | | | | PCB Layout Design| | | | | |  | | |  | | | | | | PCB Layout Print| | | | | | | | | |  |  | | | | Soldering| | | | | |  |  |  | | | | | | | Final Report| | | | | |  |  |  |  |  |  |  |  |  | Final Presentation| | | | | | | | | | | | | | |

1.3.2.1 Aims for Final Year Project 2

1. Prepare the...
tracking img