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Transformerless Power Supplies and simulations - FAST

4 years ago 2712
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These are transformerless power supplies that can feed 5V circuits with current consumption ranges from 20-30 mA to 80-100 mA. Check the C or R values and the configurations. You can simulate to measure supplied voltage and current. The model for Zener diode is on schematics for it. Change values and get your needed output current.

The bridged capacitive version worked fine for a 50mA circuit. The resistive version can reach more than this, but you need a power resistor (5W or more), it maybe too big and heat too much.

Let me know if you have suggestions or comments.

You can simulate in EasyEDA. All parts have the support. Transient Spice simulation is ready to work.

Mind that you need to take care with these circuits as they are directly connected to mains! Only do it if you know how to handle the security.


Transformerless Capacitive Power Source

Transformerless Power Source - Capacitor without Bridge

Transformerless resistive power source.


ID Name Designator Footprint Quantity
1 BZX5V1 D1 SOD123 1
2 60 V1 2P-5.0 1
3 270 R2,R1 R3 2
4 470u C2 CP_8X13MM 1
5 Ammeter A1 NONE 1
6 1N4001 D2,D3,D4,D5 DO35-7 4
7 1u C1 C1 1
8 0.47k R2 R3 1
9 1.5k R1 R3 1




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