12 Volt Transformerless Power Supply

We can convert the high voltage ac into low voltage such as 5v 6v 9v 12v dc without using the transformer which is called transformerless power supply.

12 volt transformerless power supply.

Please i am having this issues with transformerless power supply. The above concept utilizes high voltage pp capacitors for dropping the mains voltage to the required level however it is unable to raise current levels as per any desired particular. The problem with this power supply is this will kill you as the current will flow through the diode and be lethal. Capacitive type is more efficient since its heat dissipation and power loss are very low.

Resistive transformerless power supply. Circuit is simple voltage dropping capacitor of 225j is connected in series with phase line of ac this is a non polarised capacitors so it can be connected. Each time i intend to use transformerless power supply to power microcontroller 8051 atmega328p and even a dc fan of 12v 1 4a i notice that they never get powered even though the power supply has been tested to produce the required 12v or 5v dc as the case may be. Resistive transformer less power supply is similar to capacitor power supply except that instead of reactance it uses resistance to limit current.

Today we are going to know about transformerless power supply. This 12 volts transformerless power supply take advantage of the fact that a zener diode is also a normal diode that conducts current in the forward direction. Resistive type power supply on the other hand dissipates more heat so the power loss is quite high. Thus here excess energy is dissipated as heat across the voltage dropping resistor.

Circuit diagram resistive transformer less power supply circuit diagram. Here is the circuit diagram and explanation for transformerless power supply. Nowadays in many electrical and electronic equipment which are low cost they have a transformerless power supply system in this article i have tried to give you the knowledge about transformerless power supply. If you need to touch the negative rail or the positive rail and any earthed device such as a toaster to get killed.

I have discussed a few transformerless power supply circuits in this blog which are good only with low power applications and tend to become less effective or useless with high current loads. During one half wave the current flows via d1 through the load and back via d4 while during the other half wave it flows via d3 and d2. 9v dc regulated transformerless power.