220V AC - 5V DC Converter with a voltage regulator

699

21:21:12

This is charging circuit similar to what you could find in old cellphone chargers. It uses a transformator to lower the voltage and four diodes to convert AC to DC. It also has a capacitor and a voltage regulator to even out the output voltage. The output voltage is the green line and the blue line is the input voltage to the voltage regulator.
-Minnerlas

published 7 years ago

PrathikP

7 years ago

This is not a buck converter.

Minnerlas

7 years ago

Sorry for mistake, I corrected it.

hurz

7 years ago

@Minnerlas, check the topic RMS mains voltage 220V RMS is in peak 325V and not 220V. Another issue with this circuit, there is one ground too much. Remove the one at secondary transformer winding.

Minnerlas

7 years ago

@hurz thanks for corrections, I've updated the circuit

hurz

7 years ago

Great, one more issue. Zener diodes are not tunable, yours is 5.84V available to buy are only 4.7V, 5.6V or 6.2V.. According to E12 series.

Minnerlas

7 years ago

@hurz you would actually use a voltage regulator which would already be calibrated, but that non yet in the app so I did what i could😁

hurz

7 years ago

You will be surprised, but they are available and called DC source. They are perfect and if you would like to make them close to a standard regulator just put resistors or whatever you like around such an DC source to emulate its imperfect behaviour.

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