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SCR-CONTROLLER POWER INVERTER:
This is an electronic circuit, which converts DC to AC power by the use of SCR (Silicon Control Rectifier) also called thyristor.
The output A.C voltage is able to be obtained the desired, current and frequency.
|3929 (cca 11 pages)
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Preview of the essay: SCR-CONTROLLER POWER INVERTER:
CHAPTER ONE INTRODUCTION: SCR-Controller Power inverter: This is an electronic circuit, which converts DC to AC power by the use of SCR (Silicon Control Rectifier) also called thyristor. The output A.C voltage is able to be obtained the desired, current and frequency. This inversion can also be achieved by the use of transistors but transistorized inverters have the following demerits: 1) Low switching speed 2) Low efficiency 3) Small current capacity 4) Low output power The merit of transistorized inverters is that they have simplicity in control circuits For my project I have chosen the SCR or the thyristorised inverter because of the following merits: 1) High switching speed 2) High efficiency 3) Handles large currents of upto 1000A 4) No arching 5) No moving parts AIMS AND OBJECTIVES The main aim of this project is to put the knowledge acquired during the time of this course to design and construct a D.C to A.C single phase power inverter to be used for:- 1) Lighting purposes 2) Driving low power equipment 3) Acting as a stand by power supply or ups Most of the rural areas in Kenya lack the benefits of ...
... primary, so inducing a square wave voltage across the load in the transformer secondary.
The capacitor shown is required for commutation, but as the capacitor is effectively in parallel with the load via the transformer, an inductor L is required in series with the D.C source to prevent the instant discharge of capacitor C via the source when thyristor switching occurs.
When one thyristor is on, the D.C source voltage E appears across half the transformer primary, which means the total primary voltage is 2E, hence the capacitor is charged to 2E.
The firing of the other thyristor now turns off the first thyristor, by the principle of parallel capacitor commutation.
If the transformer is assumed perfect then there must be an ampere-turn balance between windings at all times.
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