Transformers

• These are not semiconductor devices; but, they play an integral role in the operations of most of the power supplies.
• The fundamental schematic symbol for the transformer is as shown in diagram,

• The transformer fundamentally consists of two inductors that are in close proximity to each other.
• But these are not physically attached.
• The device consists of two windings said the primary & secondary windings.
• The input to the transformer has been applied to the primary.
• The output is taken by the secondary winding of the device.
• Alternating voltage is applied to primary winding which induces an alternating voltage in the secondary winding.
• Although, remember that primary winding and secondary windings are physically isolated.
• A transformer may be designed in three modes.