DUAL CONVERTER WITH POWER TRANSISTOR AND SPEED CONTROL FOR DC MOTOR Prepared by Amena Ateeli & Bara`ya`qoub Supervisor Dr. JAMAL KHAROUSHA A PROJECT INTRODUCTION REPORT IN IELECTRICAL ENGINEERING An-najah National University Nablus-Palestine 2010

PROJECT OBJECTIVES Operation the machine in four quadrants. Closed loop speed control of separately dc machine. Speed control with tachogenerator and cascade current control. On the other hand, the project will study how it can be interface the converter with PIC Controller, and the electronic circuits for this aim, also the software to generate the pulses.

PROJECT IMPORTANCE Saving electrical energy by regenerative the energy to the network when the machine operation in generating mode. Ability operation the machine in different modes which get flexibility to the system.

General Block Diagram : Controller Power Circuit Converter DC Machine PIC controller Interfacing Circuit Protection Power Supply

Power Supply: We need two power supply 1.To feed Power transistor circuit to operate the circuit.

2.To feed the control circuit:

Converter with Power Transistors In this converter we use the DC chopper (Class E) techniques to control of voltage armature.

Operation in Four Quadrant

Interface circuit:

Status The Pins and Operation the devices State the machine F.Motor R.Motor F.generator R.generator PIC number port Pin16 Pin17 Pin25 Pin26 ------- Operation transistor Q1 Q2 Q3 Q4 D1 D2 D3 D4 State logic 1 The diode used to Protection the transistors Not flow current

pic

Flow Chart

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