Design, giving the necessary ratings and characteristics necessary for the transformer, bridge...

Question

Design, giving the necessary ratings and characteristics necessary for the transformer, bridge rectifier, reservoir capacitor and regulator, a 12 V, 2 A regulated power supply. Also identify any heat sink requirements. The available mains supply is 230 V ±10% @ 50 Hz. Show all working and requirements.

Robert · Accepted Answer

Solution: 
Design of a linear regulated power supply: 
Procedure adopted to design a simple regulated supply that uses a fixed-voltage, standard, 
regulator and a bridge rectifier is given step wise step. 
 
1. Define the desired D.C. output voltage, Vo, and the maximum current, Io, that the supply is to 
provide. 
 
2. Select a regulator for the desired output voltage that is capable of delivering the required 
current. 
 
3. Note the minimum allowable input voltage to the regulator (or allow at least 2 V above the 
regulated output voltage, (i.e , Vo + 2 V). 
 
4. Determine the minimum peak secondary voltage of the transformer, allowing for 2 V dropped 
across the bridge and a possible 10% supply voltage variation. The RMS secondary voltage will 
be 12 of the peak value. 
 
5. Select a suitable transformer to give at least this secondary voltage and suitable VA rating. 
 
6.

Design, giving the necessary ratings and characteristics necessary for the transformer, bridge rectifier, reservoir capacitor and regulator, a 12 V, 2 A regulated power supply. Also identify any heat...

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