POWER SUPPLY FILTRATION(Capacitor as a filter)

POWER SUPPLY FILTRATION:

  When we convert AC into DC we had a problem that the signal has two states as shown fig (a) but we need straight line DC signal as shown in Fig (b).

Here we need something material that changed the eliminate the states and changed into a straight line as in fig (b) for this reason we use power supply filter which will be a capacitor.

CAPACITOR AS A FILTER:

   We used a capacitor with suitable farad (farad is unit of capacitor) as the capacitance of capacitor is high make a perfect DC where capacitance is the capability of storing charges or current.

Capacitor as a filter

After placing capacitor the output signal will like as shown in fig.

Where the value of r, V(rect), Vdc, Vrp.p is given below

Numeric 1:

  Determine the ripple factor for the filtered bridge rectifier with the load indicated in fig.

Data:

        Vin = 120Vrms

         Frequency =120Hz

        Number of turn =ᶯ = 10/1 = 0.1

        Capacitance = C= 100µf

        Limiting resistance = RL =220Ω

       Ripple factor = r =?