DC Power Supply 1

Objectives

Ø Explain and analyze the operation of both half and full wave rectifiers 

Ø Explain and analyze filters and regulators and their characteristics 

DEFINITION

 1.Transformer 

A transformer is commonly used to step the input AC voltage level down or up.  Most electronic circuits atlower level.

For example, a transformer with a turns ratio of 10 to 1 would convert the 120 volt 60 Hz input sine wave into a 12 volt sine wave.

 

2.Rectifier

•The rectifier converts the AC sine wave into a pulsating DC wave.

•There are several forms of rectifiers used but all are made up of diodes. 

3.Filter

•The rectifier produces a DC output but it is pulsating rather than a constant steady value over time like that from a battery.

•A filter is used to remove the pulsations and create a constant output. 

4.Regulator

•The regulator is a circuit that helps maintain a fixed or constant output voltage.

•Changes in the load or the AC line voltage will cause the output voltage to vary.

   

TRANSFORMER

 

 

Transformers are often used for voltage change and isolation. 

voltage change? •turns ratio of the primary to secondary


Isolation?•prevents shock hazards in the secondary circuit.