20-11-2012, 05:01 PM
TRIPPLE POWER SUPPLY
TRIPPLE POWER SUPPLY.pptx (Size: 803.05 KB / Downloads: 32)
INTRODUCTION:
The multi-output power supply evaluation board is a fully assembled and tested printed circuit board (PCB) that provides three step - down DC regulated output voltages 5V, 12V & one variable voltage 1.25V – 20V.
It converts the AC (input ) in to 3 diffrent DC voltages. This low-cost, multipurpose power supply fulfils the requirements of almost all laboratory experiments. Nonetheless, it can be easily fabricated by hobbyist.
Resistor
A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element. The current through a resistor is in direct proportion to the voltage across the resistor's terminals. This relation is represented by Ohm's law.
V=I.R
Capacitor
A capacitor is a passive two-terminal electrical component used to store energy in an electric field. construction consists of metal foils separated by a thin layer of insulating film (called dilectric). Capacitors are widely used as parts of electrical circuits in many common electrical devices.
Capacitors may retain a charge long after power is removed from a circuit; this charge can cause dangerous or even potentially fatal shocks or damage connected equipment.
In this device, capacitor is used as filter & this type of filter is called shunt capacitor filter.
Transformer
A transformer is a static device which transfer ac electric power from one circuit to the other at same frquency but the voltage level is changed usually. A varying current in the first or primary winding creates a varyingmagnetic flux in the transformer's core and thus a varying magnetic field through the secondary winding. This varying magnetic field induces a varying electromotive force (EMF), or voltage, in the secondary winding. This effect is called inductive coupling.
There are two types of transformer depending upon
output voltage
Step up (voltage level is raised on output side)
Step down (voltage level is lowered on output size)