Aaron's Homepage Forum
Aaron's Homepage Forum
Home | Profile | Register | Active Topics | Members | Search | FAQ
Username:
Password:
Save Password
Forgot your Password?

 All Forums
 Electronics
 Power Supply
 12/120V inverter again
 New Topic  Reply to Topic
 Printer Friendly
Previous Page | Next Page
Author Previous Topic Topic Next Topic
Page: of 63

weqwedas
Apprentece

8 Posts

Posted - Dec 26 2009 :  8:42:26 PM  Show Profile  Reply with Quote
quote:
Originally posted by audioguru

It is not a mains inverter. It makes a high voltage for a zapper or something. the transistors are not flip-flops. The first little ones are emitter-followers driving the larger ones that are common-emitter switches.

The circuit with only one battery has the battery being killed by the high current in the TIP31 transistors that stops the CD4047 oscillator.

The circuit does not need the zener diode since the max allowed supply for the CD4047 is 18V. The CD4047 has a typical output current of only 4ma when its supply is 5.1V. Its output current is 22mA when its supply is 12V.

Since a little 9V battery is very weak then the supply should have a parallel supply bypass capacitor of about 100uF.



The flip-flop circuit I was talking about was superseded by the CD4047 chip. What I'm asking is what makes your circuit work where as my circuit freezes? Does the amount of current a car battery can provide mean the difference between oscillating and locking up?
Go to Top of Page

audioguru
Nobel Prize Winner

Canada
4214 Posts

Posted - Dec 27 2009 :  12:59:25 AM  Show Profile  Reply with Quote
I have never played with the transformers from a camera's flash so I don't know how much current the transistors will use driving them.
I do know that the current from a little 9V battery is low so that each time the transistors conduct the battery voltage will drop maybe low enough to stop the CD4047 oscillator.
Maybe the frequency of the CD4047 is too low for the little transformers.

A camera's flash unit doesn't use a weak little 9V battery but uses two powerful AA cells instead. Also, the flash unit's transformer is designed for a 3V power supply, not 9V that will increase the current that is used.

In my 500W inverter, SW1 is the on-off switch and F is a 60A fuse to stop a fire if something shorts.
The car battery can supply 500A before its voltage drops and look at the difference in its size and weight compared to a little 9V battery.

Gary's inverter also has a simple square-wave output but it is too complicated. I would use a CD4047 to drive the Mosfets.
Go to Top of Page

wasssup1990
Nobel Prize Winner

A Land Down Under
2261 Posts

Posted - Dec 27 2009 :  02:08:45 AM  Show Profile  Visit wasssup1990's Homepage  Reply with Quote
I remember playing with High Voltage siren flashes and camera flashes when I was just a few years old. Going by the sounds they made to charge up those capacitors I would have to say that the camera flash transformer spent most of its time above 2KHz and the siren flasher about 10KHz. I can understand why the siren flasher operated at a higher frequency. The flash interval was short and the transformer was small meaning that the energizing period would have to be shorter since the small transformer coil couldn't store too much energy in a single cycle from its drive circuitry. If the transformer coil was larger (could store more energy) then the drive circuitry could operate at a lower frequency. If the frequency is to low it will be audibly annoying, if it is too high you will need more expensive transistors that have shorter rise and fall times to be efficient but you would be able to flash the Xenon gas tube more frequently.

I hope this becomes useful to someone.

When one person suffers from a delusion it is called insanity.
When many people suffer from a delusion it is called religion.
Go to Top of Page

weqwedas
Apprentece

8 Posts

Posted - Dec 28 2009 :  10:29:58 PM  Show Profile  Reply with Quote

(Borrowed from http://www.repairfaq.org/sam)

This inverter, based off of the disposable flash camera, worked incredibly well, charging the capacitor to 300 volts in only a few seconds. It used the same transformer as my last circuit and only one 9 volt battery with the only different component being the 2sd2504 transistor used for its high gain. Only problem with this circuit in particular is it's DC only, which means you'd have to have a DC-AC circuit in order to use it for AC purposes.
Go to Top of Page

wasssup1990
Nobel Prize Winner

A Land Down Under
2261 Posts

Posted - Dec 28 2009 :  11:55:02 PM  Show Profile  Visit wasssup1990's Homepage  Reply with Quote
Yep I did a very similar experiment many years ago. I was able to use a camera flash circuit to power some small home appliances off a rechargeable cell phone battery. I enclosed it all in a self made wooden box and used it for experimentation. It has the potential to stop your heart and cause severe burns if you are caught between the capacitor terminals which is what you should be aware of. You should keep it away from people who are ignorant in this field. They could pick up your circuit and wonder "oh what is this" and then BANG. I have been shocked many times by all kinds of power supplies and I'm still here, but just be carefull.

When one person suffers from a delusion it is called insanity.
When many people suffer from a delusion it is called religion.
Go to Top of Page

Ibrahim
New Member

Nigeria
2 Posts

Posted - Jan 04 2010 :  03:55:23 AM  Show Profile  Reply with Quote
please i need sinewave inverter schematic circuit daigram

ibra
Go to Top of Page

audioguru
Nobel Prize Winner

Canada
4214 Posts

Posted - Jan 04 2010 :  11:45:40 AM  Show Profile  Reply with Quote
A sinewave inverter is fairly complicated. You probably cannot obtain the modern parts it needs in Africa.
Go to Top of Page

sparkie
New Member

United Kingdom
2 Posts

Posted - Jan 15 2010 :  10:02:36 PM  Show Profile  Visit sparkie's Homepage  Reply with Quote
Hiya all.

After looking through this thread and the internet and building a few of the circuits I found, I came up with one of my own using a PIC microchip. I havent tried it at a few hundred watts as yet, but I think it will be OK up to about 500w if you have a transformer and battery big enough.

More info on this circuit is here: http://www.m0ukd.com/electronics/modified_sine_wave_inverter/

I would be interested to know if anyone tries it how they get on!
Cheers, John.




Go to Top of Page

Ibrahim
New Member

Nigeria
2 Posts

Posted - Feb 05 2010 :  04:27:03 AM  Show Profile  Reply with Quote
pleas help me i am 17 years old i do electronic work i need 1000 watt inverter circuit diagram that will work faine pleas help me goodby see your messsage thinks

ibra
Go to Top of Page

audioguru
Nobel Prize Winner

Canada
4214 Posts

Posted - Feb 05 2010 :  10:30:10 AM  Show Profile  Reply with Quote
Everybody in Nigeria needs an inverter.
Where are you going to buy a huge and expensive transformer and many Mosfets?
Where are you going to find a huge and heavy battery that runs 1kW for only half an hour?
Go to Top of Page

weqwedas
Apprentece

8 Posts

Posted - Feb 08 2010 :  7:33:16 PM  Show Profile  Reply with Quote
Ibrahim:

A little known fact is that the human body makes a great inverter! All you need is a car battery, a person, and two sets of jumper cables. Hook up the parts like so:



Don't forget the battery polarity! This is important for the organic diodes. Please note that the jumper cable clamps and the voltage surging through the person may be a little uncomfortable at first, but that feeling will go away in a minute or two. If hooked up correctly, the two butt cheeks will begin to alternate contractions. This means that the body has converted the DC into AC successfully! Good luck!
Go to Top of Page

wasssup1990
Nobel Prize Winner

A Land Down Under
2261 Posts

Posted - Feb 08 2010 :  10:55:17 PM  Show Profile  Visit wasssup1990's Homepage  Reply with Quote
Be careful some people might actually beleive you and try this. But a good joke anyway.


PLEASE ME NEEDA THE HELP WIT FIVE 1000000000 WHAT INVENTNER!

When one person suffers from a delusion it is called insanity.
When many people suffer from a delusion it is called religion.
Go to Top of Page

weqwedas
Apprentece

8 Posts

Posted - Feb 10 2010 :  7:53:16 PM  Show Profile  Reply with Quote
I figured at that point it would be a matter of natural selection.
Go to Top of Page

wasssup1990
Nobel Prize Winner

A Land Down Under
2261 Posts

Posted - Feb 10 2010 :  11:34:16 PM  Show Profile  Visit wasssup1990's Homepage  Reply with Quote
Ha! Yeah. That's a little harsh but that's one way it works.

When one person suffers from a delusion it is called insanity.
When many people suffer from a delusion it is called religion.
Go to Top of Page

Aaron Cake
Administrator

Canada
6702 Posts

Posted - Feb 13 2010 :  10:49:39 AM  Show Profile  Visit Aaron Cake's Homepage  Send Aaron Cake an ICQ Message  Send Aaron Cake a Yahoo! Message  Reply with Quote
So after 55 pages, I think it might just be time to close this thread, but leave it as a sticky.

Thoughts?
Go to Top of Page
Page: of 63 Previous Topic Topic Next Topic  
Previous Page | Next Page
 New Topic  Reply to Topic
 Printer Friendly
Jump To:
Aaron's Homepage Forum © 1995-2020 AARONCAKE.NET Go To Top Of Page
This page was generated in 0.17 seconds. Snitz Forums 2000