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 12/120V inverter again
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audioguru
Nobel Prize Winner

Canada
4214 Posts

Posted - Apr 05 2005 :  10:47:07 AM  Show Profile  Reply with Quote
Of course simple multivibrator driven inverters produce a square wave. Incandescent lights and heaters don't care. Motor driven power tools don't care. Some electronic products don't care.

A 220V square wave produces the same power in a resistive load as 220VDC or 220VAC RMS.

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Polo G40
Apprentece

Italy
7 Posts

Posted - Apr 05 2005 :  10:57:01 AM  Show Profile  Reply with Quote
that's all right!!
but i want use an inverter on my car....
and i need synusoid...for tv,playstation
,neon lamps etc..
how i can resolve this problem??
thanks for answer audioguru...

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Edited by - Aaron Cake on Nov 25 2005 09:18:15 AM
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audioguru
Nobel Prize Winner

Canada
4214 Posts

Posted - Apr 05 2005 :  11:09:28 AM  Show Profile  Reply with Quote
Polo,
Are you going to make a linear power amplifier produce a 220VAC sine wave output? Sure, why not.

It will be about 60% efficient so will produce about 180W of heat if it drives a 300W load.
Its many output transistors will conduct peak currents of about 56A from a 12V battery.
It will need a very large output transformer.
It will be very, very expensive.

You could purchase or build a 300W car amplifier. It would drive a custom-made 36V to 220V step-up transformer.

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Polo G40
Apprentece

Italy
7 Posts

Posted - Apr 05 2005 :  11:28:11 AM  Show Profile  Reply with Quote
ok ...so i can link
this small circuits(image link)
to a car amplifier??
i don't know...the output of first stage is 220v,
the car amplifier can burn...







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Edited by - Aaron Cake on Nov 25 2005 09:18:18 AM
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Polo G40
Apprentece

Italy
7 Posts

Posted - Apr 05 2005 :  11:33:53 AM  Show Profile  Reply with Quote
sorry for the .gif...
the circuits it's a simple 50hz oscillator,
with 8w transfo....all generate 220vac 5mA curent...

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Edited by - Aaron Cake on Nov 25 2005 09:18:24 AM
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audioguru
Nobel Prize Winner

Canada
4214 Posts

Posted - Apr 05 2005 :  12:21:21 PM  Show Profile  Reply with Quote
Polo,
Don't be silly. An amplifier needs about a 1V input, not 220V.
If you need a 300W output, make sure the amp is rated for continuous 300 Watts RMS into 4 ohms with low distortion, not the distorted (square waves) "peak" or "maximum" false "Whats" ratings that are used for car amps. Audio amps have an average output about 1/10th their output rating so for continuous full power output will need a big cooling fan. A 300W into 4 ohms amp will have about a 36V output and will need a 300W stepup transformer for 220V output.


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phoenix
Apprentice

Canada
54 Posts

Posted - Apr 05 2005 :  8:44:41 PM  Show Profile  Visit phoenix's Homepage  Send phoenix a Yahoo! Message  Reply with Quote
quote:

Hi Phoenix,
The wire size is determined by its current which is determined by its power. Do you think that 500W is enough?
Which circuit are you going to use?
Will your TV run on square waves?





I'm still working on this one, http://www.electronics-lab.com/forum/attachments/500Watts_Inverter.gif that's what I'll be using, & I don't really think sqare waves r ok for all TVs...
& an output of 400-500w is good enough...
My Mian prob is getting a suitable transformer...
Cheers...
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audioguru
Nobel Prize Winner

Canada
4214 Posts

Posted - Apr 05 2005 :  9:12:12 PM  Show Profile  Reply with Quote
Hi Phoenix,
We modified another defective inverter circuit and ended up with that one. Its 500W rating is conservative because we designed it to work well even with weak transistors that are minimum spec. Someone reported that theirs provided 720W continuously.
I guess you'll have to rewind the transformer from a microwave oven.

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Polo G40
Apprentece

Italy
7 Posts

Posted - Apr 06 2005 :  07:14:56 AM  Show Profile  Reply with Quote
hi all..
i know one freiends that say that square wave
can be damage the utilizator...it's true??


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Edited by - Aaron Cake on Nov 25 2005 09:18:37 AM
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audioguru
Nobel Prize Winner

Canada
4214 Posts

Posted - Apr 06 2005 :  11:02:02 AM  Show Profile  Reply with Quote
Hi Polo,
What's a "utilizator"?
In The Philipines, they use the 500W inverter to power incandescent and flourescent lights and international TV's that operate from a 90VAC to 250VAC supply. They don't have any problem with the inverter's square waves.

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tt1493
Apprentece

Hong Kong
15 Posts

Posted - Apr 15 2005 :  04:18:13 AM  Show Profile  Reply with Quote
quote:

Hi Phoenix,

Refer to the 500W power inverter. Have any other same function and feature for the 2sc1061 power transistor?

Thanks a lot!
TT






I'm still working on this one, http://www.electronics-lab.com/forum/attachments/500Watts_Inverter.gif that's what I'll be using, & I don't really think sqare waves r ok for all TVs...
& an output of 400-500w is good enough...
My Mian prob is getting a suitable transformer...
Cheers...
[/quote]

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audioguru
Nobel Prize Winner

Canada
4214 Posts

Posted - Apr 15 2005 :  7:39:14 PM  Show Profile  Reply with Quote
Hi TT,
Since the 500W inverter was 1st made in The Phillipines, they used the oriental 2SC1061 transistor which was available there. It is not special, I would use a TIP31.
http://www.ortodoxism.ro/datasheets/mospec/2SC1061.pdf
http://www.fairchildsemi.com/ds/TI/TIP31.pdf

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beiggz
New Member

1 Posts

Posted - Apr 16 2005 :  6:19:40 PM  Show Profile  Reply with Quote
i just say the inveter schematics and i was just wondering if i can use it in my little project.

anyway i ve modify the circuit and now i need it to be tested but i dont have the appreate software and i would like to source the parts and get them shi to jamaica

extract from the

inverter

Have you ever wanted to run a TV, stereo or other appliance while on the road or camping? Well, this inverter should solve that problem. It takes 12 VDC and steps it up to 120 VAC. The wattage depends on which tansistors you use for Q1 and Q2, as well as how "big" a transformer you use for T1. The inverter can be constructed to supply anywhere from 1 to 1000 (1 KW) watts.



ps call me 876-406-3737 or 876-3406673

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tt1493
Apprentece

Hong Kong
15 Posts

Posted - Apr 19 2005 :  05:30:24 AM  Show Profile  Reply with Quote
I have a question. i find that a transformer is 220v input 12v-0-12v output.
Can it use for 12v-0-12v input, 220v output?
The sales told me can't, is he right?

Thanks
TT




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tt1493
Apprentece

Hong Kong
15 Posts

Posted - Apr 19 2005 :  05:32:10 AM  Show Profile  Reply with Quote
I have a question. i find that a transformer is 220v input 12v-0-12v output.
Can it use for 12v-0-12v input, 220v output?
The sales told me can't, is he right?

Thanks
TT




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