Using Rectifiers in Mobile Phone Chargers

All Mobil charger does not use transformer. The component used is mostly diode, capacitor, resistor, transistor and voltage regulator, since the current is very small just about few hundred milliampere.

Actually there usually is a transformer. Most mobile chargers rectify the AC into DC then use a switch mode IC to generate a high frequency (100 to 200kHz) Pulse Width Modulated (PWM) into a small high frequency step-down transformer. The lower voltage high frequency is rectified by high speed diodes and an error voltage fed back to the PWM device to control the mark-space of the PWM therby regulating the final DC voltage. The error voltage feedback is usually optically coupled.

Hai

Actually now a days different types of AC to DC power suplly used.

1.SMPS technology

2.Linear power supply

3.High voltage transister based power supply.

The SMPS power supply used for instrumentions and control application.it is support medium current.The linear power supply support high current applicatons.The transister based power supply used for mili current applications.Mobile phone chargers mostly used for transister based power supply.This type include the following components,Diode,high power resister.high voltage transisters,Zener diode or voltage resister,X capacitors.This type not required for transformers.But first two type required for transformers.

Thanks & Regards

GIRIRADHA

please Explain the SMPS & Linear voltage supply