TRANSFORMERS AND POWER SUPPLIES – Study Materials

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TRANSFORMERS AND POWER SUPPLIES

Transformer: Transformer is used to step down the AC supply voltage (220 V AC, 50 Hz) as per the requirement of the solid state electronic devices.

 Basic power supply

Rectifier

Rectifier is a device which converts the sinusoidal AC voltage into either positive or negative pulsating DC. Rectifier output contains unwanted AC components called as ripples. Diodes rectify the signal.

Filter

Filter is a device which passes DC components and blocks AC components of the rectifier output. Resistor, capacitor and inductor (passive components) are used for this purpose.

Regulator

Regulator or stabilizer is a device that is used to maintain a constant DC output voltage. Zener diode is used as regulator.

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