﻿ Power supply without transformer_Circuit Diagram World ﻿
Position: Index > Power Supply Circuit >

# Power supply without transformer

2014-11-29 05:51
Declaration:We aim to transmit more information by carrying articles . We will delete it soon, if we are involved in the problems of article content ,copyright or other problems.

Sometimes you need low consumption power supply. In this case you can use a power supply like (power supply without transformer) in schematic from this sheet.
What is so special on this power supply ?
This power supply don't use a transformer ( transformer less power supply ) and it's require just a few components .
We can observe that the U2 tension of this power supply without transformer it's equal with the zenner diode voltage and it's kept at this value such a long time than the output current .
We can calculate the value of components of these transformer less power supply circuit using these formulas .
I2=120C1(220-0.4U2).
C1=I2/1209220-0.4U2)
C1 in UF,I2 in mA ,u2 in V)
C1 capacitor must be a high quality capacitor witch can support a 400 V DC or 250 V AC.The resistor witch is used for short circuit protection must be equal with 3/I2.
C2 must have a value (in uf) equal with : C2=200I2/U2 (I2 in mA,U2 in V).
Zenner diode mast have a power equal with I2U2 and and must support values for current and voltage equal with I2 and U2.
With a small volume and low consumption , shortcircuit protection this power transformerless power supply allow to obtain a low power and economic supply.

Maybe you like
﻿