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Q: electronics ( Answered,   0 Comments )
Question  
Subject: electronics
Category: Computers
Asked by: translator-ga
List Price: $200.00
Posted: 04 Jul 2003 05:00 PDT
Expires: 03 Aug 2003 05:00 PDT
Question ID: 225082
I AM LOKING FOR THE  COMPREHENSIVE CIRCUIT DIAGRAM OF A MACHINE CALLED
POWER INVERTER.
IT IS USED IS INCAES OF POWER SUPPLY.
WHEN POWER TRIPS IT TAVKES OVER BCOS IT IS CONNECTED TO  a 12 volt or
more BATTTERY WHICH IS BEING CHARGE WHEN THERE IS POWER.
THIS IA A MORE ADVANCED THAT A UPS.
IT UOLD LAST 8-12 HRS.
DEPENDING ON THE BATTERY.
THE CIRCUIT DIAGRAM MUST BE COMPREHENSIVE WITH ALL COMPONENT NAMED AND
TAG.
THANKS.
Answer  
Subject: Re: electronics
Answered By: pafalafa-ga on 05 Jul 2003 20:02 PDT
 
Hello translator-ga,

There are a number of schematics available on the web that should meet
your requirements.  The best one, I think, can be found here:

http://www.technology.niagarac.on.ca/people/mcsele/i2k.htm

which gives plans for what the author calls a I2K Power Inverter -- A
2kVA 12VDC to 120VAC inverter for power backup.

The site describes the power inverter in considerable detail -- with
both text descriptions and detailed drawings.

The most complete drawings of the power and control circuits can be
found around two-thirds the way down the page, where it says:

----------------------

Schematics and PCB Drawings 

INVERTC.DXF Complete Schematic of the Control Circuitry in DXF format
INVERTP.DXF Complete Schematic of the Power Circuitry in DXF format
INVERTC.DWG Complete Schematic of the Control Circuitry in ACAD
Drawing format
INVERTP.DWG Complete Schematic of the Power Circuitry in ACAD Drawing
format


FETDRV.DWG The FET driver and overload protection PCB in ACAD Drawing
format
INVDRIVE.DWG The Power PCB (Bank of FETs) in ACAD Drawing format

-------------------------

Note that these files are in CAD (computer assisted design) file
formats, which require special software to view.  The site notes that
many graphics programs, such as PaintShop, can open these files.  But
if you don't have access to such programs, a free CAD Viewer, called
CADView, can be downloaded from:


http://www.softsource.com/cadview.html

This is a demo program good for a 30-day trial, but it will enable you
to view the files for the power inverter.

As I said, these strike me as the type of expert and well-detailed
documentation that you are seeking.  However, there are a few other
sources of power inverter schematics as well.  Two other sites to
consider are:

http://www.repairfaq.org/REPAIR/F_samschem.html
note items 8.15 and 8.16. 


http://www.aaroncake.net/circuits/inverter.htm


I hope this is the information you need.  If anything here requires
elaboration, just let me know by posting a Request for Clarification,
and I'll be happy to assist you further.

Good luck with your project.

pafalafa-ga

Request for Answer Clarification by translator-ga on 09 Jul 2003 02:14 PDT
u still dont get me .
i said it transforms 12 volts to 240/230
and not 120/
thanks.

Clarification of Answer by pafalafa-ga on 09 Jul 2003 04:43 PDT
Hello translator-ga,

Actually, there isn't anything in your original question that
specifies 240V, which is why I didn't focus on that in my answer to
you.  However, a colleague of mine tells me that you did, in fact,
post a comment to this question earlier with more details about what
you needed.   For some reason, though, that comment is no longer here.

Nonetheless, I am happy to provide you with additional information,
and want to say this:  I will keep working with you on this question
until you have exactly the answer the need.  So if anything here is
unclear, or needs more explanation, just post a Request for
Clarification and I'm happy to assist you further.

pafalafa-ga

-------------------------------

This site sells detailed plans for power inverters that meet your
specifications.  The plans are not very expensive:

http://www.rainbowtradingpost.co.uk/guides1.html

JEPH16. TRANSISTOR POWER INVERTER 12V OR 24V INPUT, 240V 50HZ OUTPUT

This square wave transistor inverter design will produce 240V 50HZ AC
power from a 12V car battery, or 24V (two batteries). The power
depends upon the size of transformer and transistors used, but is
typically 150-500W from 12V DC and 300-1000W from 24V DC. The unit
runs at about 80% efficiency which is excellent and better than many
commercially available inverters. The comprehensive manual gives
details on building 5 sizes from 150-1000W power output which should
be particularly suitable for installation in boats, caravans and
vehicles.

Price: 4.30p + 41p to cover postage and packing = 4.71p
 
 
 JEELEK1. 12V DC-TO-240V AC TRAPEZOIDAL INVERTER

This detailed plan shows you how to construct a professional 600VA
inverter. The output voltage has a trapezoidal waveform. This is near
enough to a sine wave to enable standard domestic appliances to
operate from the inverter and, moreover, it does not appreciably add
to the cost or size of the unit. Efficiency and control action from no
load to full load are excellent. Very well illustrated with parts list
and PCB layout.

Price: 4.50p + 41p to cover postage and packing = 4.91p

Since they are protected by copyright, I can not order the plans
myself and post them here, but you are certainly welcome to order them
directly.
 
----------------------------------

This site:

www.aidxray.com/69205e.pdf

has fairly detailed schematics for a commercially-available 240V power
inverter.

----------------------------------

There is a highly-technical report here:

www.energychallenge.org/2001Reports/Florida.pdf

which also contains schematics for a 240V inverter.

----------------------------------

Schematics for "A High Power Inverter for Remote Applications" can be
found here:

innovexpo.itee.uq.edu.au/1999/ thesis/cunningh/Thesis.pdf 

This is a 240V-output inverter with detailed schematics in the context
of a highly-technical thesis report.

-----------------------------------

Lastly, you might want to consider buying an off-the-shelf power
inverter from one of the many sources on the internet, such as:

http://www.globaltradersdirect.com/mall/power-supplies/power-inverterslobby1.asp

A DC-AC 240V inverter can be purchased for less than $100.


------------------------

Again, let me know if I can assist you further.

Request for Answer Clarification by translator-ga on 15 Jul 2003 09:30 PDT
HELLO
I HAVE NOT REPLIED SORRY
BUT STILL DOES NOT MEET MY REQUIRMENTS.
I NEDD 240 OUTPUT.
PLS HELP,
BUT REALLY CONSIDERING UR EFFORTS,I NEED THE CIRCUIT FOR A FRIEND IN AFRICA.
U COULD HELP ME PURCHASE FROM THOSE GUYS AND FORWARD TO HIM.
I WOULD PAY BY ADDING THE CASH TO UR ENDORSEMENT.
THANKS.

Clarification of Answer by pafalafa-ga on 15 Jul 2003 09:44 PDT
Hello translator-ga,

I'd like to help you as best I can.  In order to do so, I need to be
very clear about what you need.  Please answer the following two
questions:

1.  The inverters I listed on July 9th are all 240-volt output.  Do
these meet your needs?  If not, please explain why not, and what else
you need?

2.  You mentioned helping to purchase items and forward them to your
friend.  Please understand that Google Answers policy prohibits
researchers from direct communication with clients -- that is, we
cannot exchange adresses, contact information, etc.  With that
constraint in mind, how can I best help you?

Translator-ga, you have posted a handsome fee for this question, and
you are cerainly entitled to a very high level of service.  I will try
my best to help you out here.  The process will go most smoothly if
you can help me, as well, by being as clear as you possibly can about
what you need, and what you would like me to do to help.

Thank you.

pafalafa-ga

Request for Answer Clarification by translator-ga on 25 Jul 2003 08:09 PDT
some how i still am not satisfied with these answers.
pls it is either i canbt open the crobat files or the softwares are
too complex to use to veiw the schematics.
pls i need alternatives.
thanks.

Clarification of Answer by pafalafa-ga on 25 Jul 2003 08:38 PDT
Hello again, translator-ga,

Let's take things one step at a time, and see if we can work out the
difficulties you're having.

You wrote that you are having difficulty opening the Acrobat (pdf)
files.  This should be fairly straightforward to fix.  You can
download free Acrobat reader software at:

http://www.adobe.com/products/acrobat/readstep2.html

Follow the steps outlined at this site to download Adobe Reader, which
will then let you open up the PDF files I have referenced in my
answer.  If you have any trouble with Adobe, just let me know, and I
can try and walk you through the procedures for its download and use.

-------------------

I hope you have also taken a look at the power inverter that is
available for sale from Global Traders at:

http://www.globaltradersdirect.com/mall/power-supplies/power-inverterslobby1.asp

As they describe it, this power inverter has the following features:

Power Inverter Out Power Cont:120W Fuse:10A
• AC output voltage: 100V--- 240V
• Output wave from: Modified Sine Wave
• DC input Voltage: 10-15V
• Frequency 1%, 60Hz 50Hz
• Low Battery Shutdown
• Low Battery Alarm
• Over load protection, Input short circuit protection

The price is $79.90 USD, and it seems to have the features you need,
as it converts battery power to AC output in a range of voltages that
can go as high as 240 volts.  They also mention on their site that
they ship products internationally (as long as there are no legal
restrictions on doing so.)

Beyond this, if you would like me to help you further PLEASE tell me
exactly what sort of assistance you need, and I will do my best.

On the other hand, if you feel that this answer simply does not meet
your needs, then let me know, and I can ask the editors to remove it,
so that another researcher can try and assist you.
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