Wednesday, January 5, 2011
How the diode is used as a rectifier in half wave rectification by using centre tape transformer.
Posted by org at 12:19 PM
How the diode is used as a rectifier in half wave rectification by using centre tape transformer.
Components:
· Center tape transformer
· CRO
· Bread Board
· Diode
· Resistor
Procedure:
First of all I took a center tape transformer and connected it with AC voltage supply while other end was connected with bread board in which it was connected with a diode and diode was connected with a resistor and the resistor was eventually grounded..After all the arrangement I applied the voltage and to see an output I connected a calibrated CRO input with resistor and on the screen AC voltage was converted into DC voltage as shown in fig. But only the half cycle of AC voltage was connected into DC voltage because the diodes work only when it is forward biased conditions and that was during the first +ve half cycle of that input AC voltage and during the –ve half cycle that was no output.
Theory:
Transformer:
It is a device which converts the input AC Voltage into smaller or larger AC Voltage. It consist of two copper wires wounded on the small iron core and are separated by an insulating media.
Working Principle:
It works on the principle of mutual induction b/w the two coils. The coil to which input voltage is supplied is called “Primary Coil” and the coil from which voltage is supplied to the circuit is called “Secondary Coil”/
Types of Transformer:
There are two types of transformer.
1. If no. of turns of secondary is greater than no. of turns of primary then it is called “Step up Transformer”
2. .If no. of turns of primary is greater than no. of turns of secondary then it is called “Step up Transformer
Power Losses:
The power losses in transformer are:
Eddy Current Magnetic Hysteresis
We use transformer in rectification process usually set up the voltage for better visual
appearance on CRO.
Conclusion:
AC is converted into DC in rectification process but it is not completely converted into DC, there is some AC factor in DC and that is called “Ripple Factor” and it is removed by capacitor as filter.
Reference:
- Basic Electronics Solid State (B.L. Theraja)
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