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Cheap inverter circuit for 12v to 220v led bulbs 36W

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RIKRIK:
OLD Design deleted, here is the new design.

find @ https://www.eevblog.com/forum/projects/it-was-meant-to-be-so-simple-(-square-wave-inverter-low-battery-indicator/

Zero999:
The joys of simulators ay? ;D

Of course the original poster probably meant 4.7µF.

I'd be more worried about the the voltage source supplying 188A!

I think there's some crossconduction going on, i.e. both MOSFETs turning on simultaneously.

This circuit will be fine, as long as the LED lamps don't have capacitive droppers, which won't like a squarewave. The frequency won't be important, since it will be converted to DC inside the lamp. The other potential issue is the peak output voltage will be 220V, rather than the 311V expected by the LED lamp.

patrick1:
seriously dude, if you have an electronics store around,   you want too use a 555 timer going into a CD4017, which, for every 10 pulses of the 555, - gives you one per each of its 10 output pins.

meaning you can tie the output pins together in any way that suits, for eg 1,2,3 on 4,5 off, 6,7,8 on 9,10 off

then you can take 1,2,3   and 6,7,8  and use each set too drive a transistor for each side of your split primary.

bread and butter stuff. i still use it all the time for heaps of applications. very versitile

Zero999:

--- Quote from: RIKRIK on September 10, 2019, 10:38:29 am ---Thanks for your reply's back :). Don't worry i also bread boarded the circuit as I know tolerences in components can throw the numbers off,, il probably have to change the low battery indicator to include a trimpot, waiting on a 100k resistor to see if I can get away with out using one. 555 and CD is good, I'm guessing that's a modified sine wave inverter.
--- End quote ---
The frequency really isn't important for the majority of LED lamps, especially the higher power units, which will be perfectly happy with 300VDC.


--- Quote --- My aim for the project was to make it as simple and cheap as possible , also repairable.
--- End quote ---
How about a blocking oscillator? It just needs one transistor.
https://en.wikipedia.org/wiki/Blocking_oscillator

Audioguru again:
Dis you test the LED light bulbs to see if they produce any light from the much lower peak voltage of the inverter's squarewave instead of the much higher peak voltage of the mains sinewave?

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