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wasssup1990
Nobel Prize Winner

A Land Down Under
2261 Posts
Posted - Aug 23 2010 :  05:32:50 AM  Show Profile  Visit wasssup1990's Homepage  Reply with Quote
Of course there is. You can do it many different ways but I don't have the time to do it for you. Since there are so many ways to do it I would be silly to design a circuit for you because you might have ideas yourself of how to do it and I would prefer you to figure it out for yourself. It's really simple to do and I'm sure you will figure it out if you put your mind to it.

Hints:
Micro-controllers
Discrete logic involving counters and conditional logic ICs.
Triangle wave generator with comparators.
The list goes on...

Good luck.
When one person suffers from a delusion it is called insanity.
When many people suffer from a delusion it is called religion.
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audioguru
Nobel Prize Winner

Canada
4218 Posts
Posted - Aug 23 2010 :  08:18:53 AM  Show Profile  Reply with Quote
quote:
Originally posted by kivdenn
I would like to ask Mr Audioguru whether this type of inverter has a 'shoot through' current moment as it is in the case of a simple CD4047 square wave inverter we discussed in some other thread.

No it does not have the "shoot through" problem because the SG3524 IC has "dead time" built-in as shown on its dtasheet.

But the circuit you showed is a very simple square-wave inverter. You need a different circuit to producer a modified square-wave or a pure sine-wave.
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RRITESH KAKKAR
Apprentece

India
23 Posts
Posted - Aug 23 2010 :  09:03:30 AM  Show Profile  Reply with Quote
Sir, as I am Switching It by Relay connected to ac suply by which It is working plzzzzzzzzzzzzzzzzz sir tell Simple ckt of MOSFET to connect with it.................................!
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RRITESH KAKKAR
Apprentece

India
23 Posts
Posted - Aug 23 2010 :  09:10:20 AM  Show Profile  Reply with Quote
Sir as for Calculating Power I need p=vi But I don't know The Current As I not have good device for This I thick By calculating Transformer Resistance & then put p=v2/r by this I can also do or not plz telll........!
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kivdenn
Nobel Prize Winner

Uganda
535 Posts
Posted - Aug 23 2010 :  10:19:14 AM  Show Profile  Reply with Quote
Thanks Guru, now I would like to turn the very circuit into a modified sine wave inverter using the CD4025 gate as we did to the other circuit of CD4047 simple square wave inverter. Which pin on the SG3524 IC works as pin 13 of CD4047? Thanks
Dennis
quote:
Originally posted by audioguru

quote:
Originally posted by kivdenn
I would like to ask Mr Audioguru whether this type of inverter has a 'shoot through' current moment as it is in the case of a simple CD4047 square wave inverter we discussed in some other thread.

No it does not have the "shoot through" problem because the SG3524 IC has "dead time" built-in as shown on its dtasheet.

But the circuit you showed is a very simple square-wave inverter. You need a different circuit to producer a modified square-wave or a pure sine-wave.
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JUAN DELA CRUZ
Mad Scientist

Philippines
476 Posts
Posted - Aug 24 2010 :  04:03:30 AM  Show Profile  Reply with Quote
Hi Guys :)

It is been a long time that I tinker with this ckt. it does not have a 'shoot through' problem. Audioguru and Pebe and audioguru assist me.
I want to share this simple Low frequency type Modified Sinewave inverter to anyone who doesn't have reliable electricity. My electricity now is reliable but I often use this circuit when there is a power failure due to a storms.

"It's simple yet effective."


Note: Pin 10 of CD4017 is connected to the anode of D2 (1N4148).



EDITED:
hi johnny, I am using my cellphone in posting in this thread (I'm now in a travel in a remote area were there is no internet conn.)
I don't have with laptop :)
juan dela cruz
Penniless INVENTOR
Edited by - JUAN DELA CRUZ on Aug 25 2010 12:09:21 AM
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wasssup1990
Nobel Prize Winner

A Land Down Under
2261 Posts
Posted - Aug 24 2010 :  04:47:41 AM  Show Profile  Visit wasssup1990's Homepage  Reply with Quote
I can't see your picture.

Once you get your picture up I would like know what kind of efficiency you got out of your inverter. Energy efficiency is very important to me in a design and I would like to know what your type of design can pull off.

Electricity prices are going up where I live and I am taking steps to cut costs and even considering off-grid solar energy to power the whole house. The solar rebate here is for fools only. I honestly prefer to get pre-made and fully tested power inverters but they cost a few thousand dollars each so I am considering making my own. That will certainly make all you inverter fans go nuts. I'll only design an inverter if my calcs show I can get good efficiency. The solar panels themselves will be several thousand dollars total and batteries are up there too unless I can find cheaper ones without long-term compromises.
When one person suffers from a delusion it is called insanity.
When many people suffer from a delusion it is called religion.
Edited by - wasssup1990 on Aug 24 2010 05:05:34 AM
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JUAN DELA CRUZ
Mad Scientist

Philippines
476 Posts
Posted - Aug 25 2010 :  12:41:34 AM  Show Profile  Reply with Quote
Hi johnny,
My circuit is a Low Frequency type Modified sinewave inverter using 4017 decade counter to ensure there's no 'shoot through' problem.

"It's simple circuit yet effective."

But I think if you are trying to design a high efficient (High Frequency Type) power inverter it will be more expensive with a Pure sinewave opt. and LESS expensive with a Modified Sinewave opt.

*LOW Frequency Type Power Inverter
>> cheaper
>> easy to build
>> parts availability
>> less efficient
(but better design I believe can achieve >70%)

*HIGH Frequency Type Power Inverter
>> much expensive
>> needs alot of experimenting/ searching of parts needed
>> more efficient
(but bad design I believe can achieve <70%)




Note: Pin 10 of CD4017 is connected to the anode of D2 (1N4148).

http://www.pinoyden.com.ph/index.php?topic=71627.0]The diagram is in the bottom part

http://www.pinoyden.com.ph/index.php?topic=71627.0
juan dela cruz
Penniless INVENTOR
Edited by - JUAN DELA CRUZ on Aug 25 2010 01:36:26 AM
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wasssup1990
Nobel Prize Winner

A Land Down Under
2261 Posts
Posted - Aug 25 2010 :  04:40:11 AM  Show Profile  Visit wasssup1990's Homepage  Reply with Quote
quote:
Originally posted by JUAN DELA CRUZ

Hi johnny,
My circuit is a Low Frequency type Modified sinewave inverter using 4017 decade counter to ensure there's no 'shoot through' problem.

"It's simple circuit yet effective."

But I think if you are trying to design a high efficient (High Frequency Type) power inverter it will be more expensive with a Pure sinewave opt. and LESS expensive with a Modified Sinewave opt.
*LOW Frequency Type Power Inverter
>> cheaper
>> easy to build
>> parts availability
>> less efficient
(but better design I believe can achieve >70%)

*HIGH Frequency Type Power Inverter
>> much expensive
>> needs alot of experimenting/ searching of parts needed
>> more efficient
(but bad design I believe can achieve <70%)


Hi Juan,
Green = I agree.
Red = I don't agree.
Orange = I somewhat agree.

I don't think that high frequency inverters are "much expensive" to design, in fact the efficiency gains and other advantages of these types of inverters justify why they are a prefferd by most people over low frequency inverters.

In fact pre made low frequency inverters tend to be more expensive. However we are talking about designing these inverters so perhaps one of the major cost savings for LF inverters is that people can scavenge a transformer from a microwave oven and just buy the wire to make a new primary coil. With HF inverters you would be very lucky to find a transformer to suite your needs thus you would probably need to make your own from scratch. However they really arn't too hard to make and they are lighter and smaller as well. All you need is a powdered iron toroid core and wrap a few turns for the primary and maybe between 200 and 300 turns for the secondary. I have made them before and they are very cute and efficient little things.
When one person suffers from a delusion it is called insanity.
When many people suffer from a delusion it is called religion.
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audioguru
Nobel Prize Winner

Canada
4218 Posts
Posted - Aug 25 2010 :  10:15:11 AM  Show Profile  Reply with Quote
Electronic parts are very inexpensive in the Western World where we are paid well.

I also did not see the low frequency inverter schematic at the foreign website.
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wasssup1990
Nobel Prize Winner

A Land Down Under
2261 Posts
Posted - Aug 25 2010 :  11:17:16 PM  Show Profile  Visit wasssup1990's Homepage  Reply with Quote
quote:
Originally posted by audioguru


I also did not see the low frequency inverter schematic at the foreign website.


I skimmed through and then gave up trying to find it.

Juan please just post a picture here (that displays) or link us to a website where the design is actually there and not a thousand clicks away.
When one person suffers from a delusion it is called insanity.
When many people suffer from a delusion it is called religion.
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JUAN DELA CRUZ
Mad Scientist

Philippines
476 Posts
Posted - Aug 27 2010 :  04:09:13 AM  Show Profile  Reply with Quote
johnny,
This is the simple Msw inverter that I was talking about. As I said its a Low frequency type. It uses 4017 decade counter to ensure there is no 'shoot through' problem. A simple circuit that can be made by a hobbyist. But, it uses numerous parts.
That is why I am planning to use a single IC to drive mosfets. And you guess it right. . . a 'Low freq. Type' using huge transformer from an old welding machine
:D




Edit: Updated diagram posted
juan dela cruz
Penniless INVENTOR
Edited by - JUAN DELA CRUZ on Sep 02 2010 6:26:59 PM
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wasssup1990
Nobel Prize Winner

A Land Down Under
2261 Posts
Posted - Aug 27 2010 :  05:56:10 AM  Show Profile  Visit wasssup1990's Homepage  Reply with Quote
Cool. What kind of efficiency do you get?
When one person suffers from a delusion it is called insanity.
When many people suffer from a delusion it is called religion.
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JUAN DELA CRUZ
Mad Scientist

Philippines
476 Posts
Posted - Aug 27 2010 :  06:30:56 AM  Show Profile  Reply with Quote
quote:
Originally posted by wasssup1990

Cool. What kind of efficiency do you get?

For this simple low freq. inverter 75% is apparent.
juan dela cruz
Penniless INVENTOR
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wasssup1990
Nobel Prize Winner

A Land Down Under
2261 Posts
Posted - Aug 27 2010 :  06:38:19 AM  Show Profile  Visit wasssup1990's Homepage  Reply with Quote
quote:
Originally posted by JUAN DELA CRUZ

quote:
Originally posted by wasssup1990

Cool. What kind of efficiency do you get?

For this simple low freq. inverter 75% is apparent.


Yeah that sounds reasonable for that type of inverter.

For powering a whole house off solar... not a good idea with this type of inveter. I would be throwing away a quarter of what I produce.
When one person suffers from a delusion it is called insanity.
When many people suffer from a delusion it is called religion.
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