Push-pull applications makes a more reliable waveform output than that of a flyback converter. Thus it can be used. The below circuit have a push-pull transformer, with two Switching transistors, whose base feedback is collected from the transformer itself (self oscillating).
This one has output power of upto 18Watt stated at 12V, though we can see the output is coupled by a series capacitor/diode here.The transformer has 5 lines at input section. Central connector goes to +VE supply, through a L1 inductor coil. It absorbs the spikes due to the switching of transformer.
L1 should be 10mH to 100mH wit ferrite core. There two power stage pins, and two feedback goes to each of transistor’s collector, base.
The initial base feeding is done by a 220 Ohm resistor to the base of any of the transistor, having a capacitor of 104(0.1uF) to the other transistor. This technology can be used for similar CFL lighting/ mobile charging etc applications which does rectify the input power to DC.
The most advantage of this circuit is that this circuit glows CFL even at huge battery discharge. Experiments show, Light stays till battery voltage goes down to 5V. It’s not safe to run appliances upto that discharge level, as that would lead ‘sulphation’ to the battery plates.
Here is used D880 or 1351 transistor for a output of 18Watt, but similarly we can use 2N3055 transistor in this setup with a big transformer to make output of upto 100W.
Front side of the PCB
Back side of the PCB
The cost of whole parts is low compared to the total setup cost, We can arrange parts for it within 40 rupees to 80 rupees for quality, And the total kit is normally sold in spare parts shop at 60~150. (Appx 1.3~3 USD)
The circuit looks like it might be a winner, except for the diode on the output. CFL bulbs are best driven on pure AC. Otherwise you will get blackening on one end of the tube and premature failure.
Hi, i am saravanan from tamil nadu I am yourr great fan I had more intrust in electronics I want’s your e-mail id for electronic doveit clearans Pls help me
i need to light up 14 watt cfl which are >.85 PF so what changes should i need to change in circuits
Hai,
If i want to light up 14W CFL with >0.85 PF what components should i need to replace,
pleas help me i have list one a one part of this dvice
the transistors used in this circuit are D882…… NOT D880
i want the transformer details of this two transformer for this circuit
thanks alot
Sir, can I use it to glow 5 watt led
If the LED bulb is rated 5W-220V, then you can run it from this PL driver. But it’s unreliable for LED driving.
thanks you sir , can u please sent detail about transformer
Hi Ankit, read the “Transformer details” section of this post. https://www.circuitsdiy.com/20-watt-cfl-inverter-circuit/
Hope it’ll be enough, same design.
Thanks you Sir ?
Transistors and capacitor (104) blowing off (over heating), 6v d882 cfl emergency lamp. Cfl filaments are good . Any solution.
Sir could you please send me the working or this inverter circuit.
Thank you.
Hi Sanjay, here how it works, https://en.wikipedia.org/wiki/Royer_oscillator
It’s called a current fed royer oscillator.
Sir I can use kjl882 component in induction stove
Hi Abhishek, I’ve no idea about this component !
I will try. Thanks Sir.
Hello sir can you please send me the whole calculation part of the Circuit ?