Transformerless Power Supply Led Tubelight Circuit

The following post explains the complete construction details of a simple led light tube circuit using 20 ma 5 mm high bright white leds.

Transformerless power supply led tubelight circuit. 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. An led tube light is lighting device built using high efficiency leds for illuminating a premise where it is installed through the available ac mains supply. Please i am having this issues with transformerless power supply. Here in the above circuit 230v ac supply can be dropped by using 225k 400vx rated capacitor.

Capacitive type is more efficient since its heat dissipation and power loss are very low. The circuit diagram of transformerless power supply is shown below. The whole concept of this power supply involves rectification voltage division regulation and inrush limiting. Here is a dc voltage regulated transformer power supply circuit.

So in this project we are going to build a simple 220 110v ac to 0 12v dc transformerless adjustable power supply circuit using lm317 linear voltage regulator ic an x rated capacitor. If a circuit requires very low. Generating low voltage dc from the 220v or 110v ac mains is very useful and necessary in the field of electronics. Finally connect the ends of this series led assembly with the led board points of the above explained power supply circuit.

This clever design uses 4 diodes in a bridge to produce a fixed voltage power supply capable of the current 35ma. The primary function of a transformerless adjustable power supply is to translate an input ac signal to a required dc level. The basic working principle of the transformerless power supply is a voltage divider circuit that converts single phase ac high voltage to a desired low dc voltage without any use of transformer and inductor. 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.

Low voltage dc like 5v 6v 9v 12v is used in electronics circuits led bulbs toys and many household electronics items generally batteries are used to power them but they need to be replaced time to time which is not cost effective and also takes our time energy. 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. The basic circuit of the transformerless power supply. Transformerless power supply circuit diagram.

Feed the 220v input to the capacitive supply and watch the led dazzle up with mind blowing brightness. Fixed voltage regulated transformerless power supply. The two basic types of transformerless power supplies are capacitive and resistive. That s it you have just converted a dead cfl into a high bright led bulb.