Inverter Circuit 12V DC to 230VAC Sine Wave

[audioguru2]

i just want these bd234 trannys but if the tip142 is ok ill try it ,even though they are bigger

No. The huge TIP142 is completely different. It is an NPN darlington transistor. A TIP32 is a PNP single transistor, is not too big and will replace the BD234.

i rplaced the tesla trannys for 2n3058 trannys which i was told are more poerfull than the 2n3o55, but the voltage went down and the same left tranny got hot.

No. The 2N3058 is a small PNP transistor, not an NPN power transistor like the 2N3055. You need a power transistor with high current gain, not high power. Then the project will produce more power.

 

[steven2]

oops i put the wrong tranny down sorrey

 

[steven2]

oops 2n5038 tranny was the one i used in place of the  tesla trannys i  got the part number wrong. the 2n5038 i have is the same size and shape as the 2n3055 npn tranny, thats twice i oops up.

 

[audioguru2]

Hi Steven,
You wrote that the microwave lightbulb is marked 2A at 250V. That is 500W!
The lightbulb would cook the food and the microwaves aren't needed.

Look again, it is probably marked, "0.2A". Then it would be 50W at 250V or 40W at your 240V.

 

[steven2]

2A 250 V T180  thats all thats on it

 

[steven2]

View attachment 40169

 

[ante1]

Hi Steven,

The 2A 250V you’ve got there must be the maximum rating for the socket not the bulb I believe.

 

[steven2]

theres nothing on the bulb so im mystified there

 

[ante1]

These bulbs are usually something like 10 – 20 W, this is not always marked on  unfortunately.

 

[audioguru2]

It looks like my 4W and 7W night-light bulbs, except it is dimmed.

 

[steven2]

i found the details it was on the shiney metal side of the globe it was a bit hard to see so i used my dome lense to view it , and i took a picture of it useing the zoom lense of my digital camera. its 240 volts 25 watts so how many amps is it , my inverter circuit only makes it look dim as i have it turned down  so the tranny wont over heat

View attachment 40171

 

[steven2]

i have to make the rectifier circuit to run off this inverter so i can use it in my hydrogen/oxygen from water  exsperiment heres a picture of it under construction

View attachment 40172

 

[audioguru2]

The current in the light bulb when it is very bright is only 25W/240V= 0.1A. Since yours is dim then its operating power and current are a lot less.

Maybe you can fix the cause of the hot transistor:
1) Swap the Tesla output transistors.
2) Swap the BD234 driver transistors.
3) Swap the 15 ohm output base drive resistors.
If the other side gets hot then you have found the problem.

 

[steven2]

thats only a small one sp it may be easyer to work and i can add another  t peace in the middle section  and use that and the left or right section , this will be like bringing the electrodes closer for faster effects

 

[AN920]

A square wave inverter can provide a reasonable sine wave output with a few modifications. This was a common method long ago before fast switching pwm. This was implemented with scr type square wave inverters but can also be applied to transistor or fet types. Basically the switching current is forced to be resonant producing a sine output. This was good up to several kW's.

The drawback is that the tuning element values are somewhat load dependant. Also voltage regulation is also load dependant. A more complicated sceme can be used which requires a extra tap on each half secondary winding to provide passive feedback to overcome these problems. Performance was typical 2.5% output change for 25% input variation at full load.

Pictures show typical waves to be expected from this inverter. One is from my simulation and other from actual documented test.

 

[steven2]

intresting keep up the good work

 

[shivamukiri]

hai guys this is shiva newly added as ur friend please i want pure sinewave inverter circuit diagram for input 24v dc output 230v ac with pwm based circuit diagram pls send as early as possible.the rating of inverter is 1kv or 2kv simple circuit,

thanking u

 

[Kasamiko]

It's been awhile since my last visit on this thread and was so disappointed that almost all the attachment is NOT available anymore.

404 - Attachment Not Found

Or it's just me?  ???


Good day to all..


Rhonn

 

[Hero999]

Many old attachments were lost when the server crashed awhile ago.

 

[Kasamiko]

disaster.. :'(