Another INVERTER we can talk about..

[Kasamiko]

That 370 VDC will be tapped directly to TV's main filter capacitor, 220uF/450VDC..then goes on TV regulator for 115VDC output for the rest of the circuit.. ;D

rhonn 

 

[audioguru2]

I see that the HV is regulated too, that's nice. ;D

 

[Alun]

That 370 VDC will be tapped directly to TV's main filter capacitor, 220uF/450VDC..then goes on TV regulator for 115VDC output for the rest of the circuit.. ;D

rhonn 

You could increase the efficenciey by bypassing the TV's internal regulator, modifying your circuit to give 115VDC and using it instead of the internal regulator. Doing this you could save quite a few watts.

 

[audioguru2]

How about operating the inverter at the TV's horizontal scan frequency with sync to the broadcast frequency?

 

[Kasamiko]

You could increase the efficenciey by bypassing the TV's internal regulator, modifying your circuit to give 115VDC and using it instead of the internal regulator. Doing this you could save quite a few watts.
It's a good idea but then it will render the AC/DC function of the tv useless..

@Sasi
I've tried a DC colored tv with almost the same inverter circuit running at 75khz..and I can't see any interference..

@audioguru
I've seen some tv brand/models that uses the FBT transformer as power supply chopper at the same time and using horizontal scan frequency..

 

[Alun]

It's a good idea but then it will render the AC/DC function of the tv useless..

So you wan to be still be able to run this TV of the mains as well as a battery.

You could just use a switch and mount you inverter circuit somewhere on the inside of the TV's cas,  then add a switch to change it from mains to battery mode. In battery mode the TV's internal regulator will be bypassed and in mains mode it won't be. This would give you the best of both worlds.

 

[Silk J.P. Austin]

And this is the smallest inverter I have ever made....120VA used by my brother in his CAR.

Hi Sasi,

I hope you are still reading here. :
Do you have a pcb and circuit of that nice small one.

That's what Im looking for because I just need 75...100VA and so the 120VA will be fine - with
a 'bit' reserve ! 8)

silk

 

[nitrojunx]

@ Sasi,

 

[kachew]

hi dear frend ...can pls teach me how to calculate for the CD4047 and the MM5389 to get 50hz output?? thanks lots

 

[audioguru2]

can pls teach me how to calculate for the CD4047 and the MM5389 to get 50hz output??

The calculation for the frequency of a CD4047 oscillator is shown in its datasheet. It is used as a 50Hz or 60Hz oscillator in our 500W inverter project and here is the corrected schematic of its oscillator.

What is an MM5389??View attachment 39367

 

[audioguru2]

I have an MM5389 IC with a 3.58MHz color TV crystal making 60Hz. The IC is very old and has not been made for many years. It is so old that I couldn't find its datasheet to see if it can also make 50Hz.

 

[ante1]

Hi AG,

This one is about US$ 95: http://www.elfa.se/elfa-bin/setpage.pl?http://www.elfa.se/elfa-bin/dyndok.pl?lang=en&dok=11186.htm
I don’t think you could get the parts for that amount of money!
What do you think? 

 

[audioguru2]

Hi Ante,
The sine-wave inverter is made in Taiwan by "nobody" but I suppose that ELFA will replace it if it fails. It might be good.

 

[ante1]

Yes i think there are no such problems:
"ELFA warrants that it will replace or repair any faulty Products if the fault occurs within one (1) year from the date of delivery"

300W cont.
350W for 20 min.
500W peak.

Not too bad for 95 bucks!

 

[audioguru2]

ELFA will replace it only within one year.
I have a garden hose that has an unlimited warranty. It gets weakened by the sun and fails every two years and I get it replaced over and over.

 

[ante1]

We have a law which regulates warranties for consumer products. I believe one year is the shortest time allowed for any product. In many other countries’s its 90 days limited warranty which is the most common time and that doesn’t even always include replacing the product just send it for repair.
Your hose supplier will eventually go bankrupt, that's a stupid way to operate a business. They should have put restrictions against UV exposure in the warranty terms. Anybody knows what UV does to rubber and PVC, and most anything for that matter. I once had car tires with 50000 km warranty and I did not run them for more than half of that distance I paid less than half the price for the next set of tires. This was more than 30 years ago and when I bought a new car after a couple of years they did not have the size to fit so I lost the deal. Since then I have stopped leaving rubber in every intersection and curve so the tires last much longer anyway! ;D

 

[audioguru2]

Your hose supplier will eventually go bankrupt, that's a stupid way to operate a business.

Nope. They are still in business many years later and so is my computer's manufacturer.
The hose people know that most morons lose their receipt so cannot participate in the unlimited warranty. My computer's people know that most morons don't use the rebate coupons but I always do.

I also had a very powerful car with a turbo. It was lots of fun.

 

[kachew]

hi audioguru..this is the circuit u all posted earlier but is quite blur there so i just guess the component model so sorry here i attach the reattach the circuit...thanks for helping me 8)

View attachment 39376

 

[audioguru2]

This is a linear sine-wave inverter and it wastes a lot of power and its output Mosfets get extremely hot because they conduct a high current all the time.

 

[kachew]

yes i know ...i just wants to know about the IC used for producing the square wave...what is the model of the IC and how can it produce a 50hz square wave?? thanks :-*