15v Power Supply

By:

KHURRAM SHAHZAD051-12-117688

Department of Electronics Engineering

Iqra University, Islamabad

A device that transfers electric energy from a source to a load using electronic circuits is referred to as power supply.

A typical application of a power supply is to convert utility AC voltage into regulated DC voltages required for electronic equipment.

WHAT IS POWER SUPPLY?

STEPS INVOLVED IN MAKING A POWER SUPPLY

RAGULATED DC POWER SUPPLIES

Provide accurate DC voltage, derived from AC mains.Are cheaper in nature.Provide constant voltage irrespective of load variations

BLOCK DIAGRAM

A step down transformer is used to reduce the dangerously high AC voltage to a safer level

1.TRANSFORMER

In our power supply the output of the transformer is an AC step down to 15V

Transformers waste very little power , so the power out is almost equal to the power in. So, as voltage is stepped down current is stepped up.

2.BRIDGE RACTIFIER

A bridge rectifier is an arrangement of four or more diodes in bridge circuit.Convert the AC voltage to DCWorks on the rule of full wave rectification

FLOW OF CURRENT

3.FILTERING

Filtering is technique in which a pure DC is obtainedThe output of a bridge rectifier is not pure DC and needs to be converted into pure form

A capacitive circuit is used as a filter or a smootherIt converts the pulsating DC into a pure DC or steady state DC with a little ripples

Eliminate ripples by setting DC output to a fixed voltageVoltage regulator ICs are available with fixed (typically 5, 12, and 15V) or variable output voltagesEach regulator has its own data sheet and pin configurationLM 7815 used in our power supply

4.REGULATOR

CIRCUIT DESIGNING

Designing a circuit

Simulating the circuit in any of the friendly interfaced simulating software

PROTEUS is used for circuit designing & simulation

SIMULATION

CONNECT OSCILLOSCOPE WITH SINGLE WIRE

RESULT -1

CONNECT OSILLOSCOPE WITH DOUBLE WIRE

RESULT-2

CONCLUSION

Design of 15V power supply

Simulation

Find results

The results in a pure DC wave form in which remaining ripples were also eliminated