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audioguru
Nobel Prize Winner
Canada
3761 Posts |
 Posted - Oct 24 2006 : 09:31:34 AM
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Shivick,
A 1A transformer is much too small for an inverter. The square-wave inverter' circuit needs maybe 20W to begin working but your transformer supplies only 12W. The smallest transforer is about 10A for an output of 100W. |
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shivick21
Apprentice
Philippines
57 Posts |
Posted - Oct 24 2006 : 1:01:36 PM
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quote:
Shivick,
A 1A transformer is much too small for an inverter. The square-wave inverter' circuit needs maybe 20W to begin working but your transformer supplies only 12W. The smallest transforer is about 10A for an output of 100W.
well i just use these as my test purposes.. btw.... i about C1 (.1uF metalized caps) is there any subsitute for these? and, can i use MN4047 rather CD4047? an do i realy need ML358 for amp? coz when i place IC2 in place.. i only got half of the transformer running.. |
nothing anusual.. |
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audioguru
Nobel Prize Winner
Canada
3761 Posts |
Posted - Oct 24 2006 : 4:25:57 PM
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A metalized film capacitor is mylar or polyester. In the Orient they are called "green caps" and 0.1uF/5% is marked "104J". I use Philips or Siemens and they are marked "100nFJ".
I think an MN4047 is made by Panasonic but I have never seen one. All American and European semiconductor manufacturers make a CD4047.
The LM358 dual opamp boosts the the two outputs of the CD4047 from its 8mA to about 20mA so the transistors have enough input current. |
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shivick21
Apprentice
Philippines
57 Posts |
Posted - Oct 26 2006 : 07:55:49 AM
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| ei! i got my inverter working again! yey! but i have some problems with it. it seems that when i disconect one of the signal pulse from LM358 to C/H1061, i get 190 volts w/o load and 80 volts with a 10w bulb or when i disconect one line from the transformer, i get this results too. but if i connect both signal/line form transformer, the inverter doesent work... ill post some pics on my inverter.. btw. does c1 need to be polarized? coz. it sayz on its diagram that it is polarized. but mylar/polyester ones are not. |
nothing anusual.. |
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audioguru
Nobel Prize Winner
Canada
3761 Posts |
Posted - Oct 26 2006 : 8:53:33 PM
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Shivick,
Instead of a center-tapped 24V transformer winding (12V-0V-12V), your transformer might have two 12V windings. They must be wired with the correct phasing to work properly in the inverter circuit.
C1 must not be polarized.
The inverter's output is a square-wave that is measured incorrectly with an ordinary voltmeter that is made to measure sine-waves. |
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shivick21
Apprentice
Philippines
57 Posts |
Posted - Nov 04 2006 : 02:40:42 AM
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audioguru,
It seems that the controller itself draws a large amount of current just to feed on the C1061.. i remove the controller and try to figure out how to mimic it.... when i touch the collector terminal of c1061, the transformer generets a humming sound... and the bulb starts to glow. i measured the amount of energy that its produce and end up 170V. now... when i accidentally touched the emmitter junction of the other C1061... the noise starts humm smothly and the voltage reach @ 190V.. on one side only... i try hook up some series of resistors and it generate 170v with the annoying humm sound..
my question is.. what signal do the c1061 need to trigger its pulse?
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yomi
New Member
Nigeria
2 Posts |
Posted - Nov 04 2006 : 2:06:11 PM
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| using 4047 with darliton pair in oslator circuit |
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shivick21
Apprentice
Philippines
57 Posts |
Posted - Nov 08 2006 : 12:21:27 PM
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guys? can i use other types of multi vibrator in this project?
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audioguru
Nobel Prize Winner
Canada
3761 Posts |
Posted - Nov 08 2006 : 5:52:13 PM
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The CD4047 IC was used as an oscillator in the 500W inverter project because it does exactly what is needed and is cheap and available:
1) It operates fine with a supply up to 18V (a transistor multivibrator has emitter-base avalanche breakdown in its transistors if the supply is more than about 6V).
2) It uses a single resistor and capacitor to oscillate fairly accurately at 100Hz or 120Hz.
3) It has a built-in flip-flop frequency divider to make outputs that have exactly 50% duty cycle at 50Hz or 60Hz.
4) One of its outputs is inverted from the other output.
There are no pulses. Each half of the center-tapped transformer winding are driven with opposite-polarity square-waves. |
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akin_ralph
New Member
Nigeria
1 Posts |
Posted - Nov 08 2006 : 8:31:52 PM
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| Hello, can somebody help me out on how to construct a 3000watts inverter? |
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audioguru
Nobel Prize Winner
Canada
3761 Posts |
Posted - Nov 08 2006 : 9:32:57 PM
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| An inverter to make 3kW continuously would use a whole room full of huge batteries and would cost a fortune to make. Where would you go to have a custom-made transformer made for it? |
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shivick21
Apprentice
Philippines
57 Posts |
Posted - Nov 09 2006 : 10:52:10 AM
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quote:
Originally posted by audioguru
The CD4047 IC was used as an oscillator in the 500W inverter project because it does exactly what is needed and is cheap and available:
1) It operates fine with a supply up to 18V (a transistor multivibrator has emitter-base avalanche breakdown in its transistors if the supply is more than about 6V).
2) It uses a single resistor and capacitor to oscillate fairly accurately at 100Hz or 120Hz.
3) It has a built-in flip-flop frequency divider to make outputs that have exactly 50% duty cycle at 50Hz or 60Hz.
4) One of its outputs is inverted from the other output.
There are no pulses. Each half of the center-tapped transformer winding are driven with opposite-polarity square-waves.
is there any other way to find if my oscillator working? can i add some LED to the pin 09 and 10? just enough to find it flipping? i have made one inverter w/o IC. (the one sir aaron diagram although i use the alternative one....) it works but my initial output is only 150volts... its a 1Amp 12v center tapped - 220 transformer but it only generates that much power... on the other hand, i use a 7.5VCT 750MA transformer and it generates around 400volts (my Digital Multimeter cant calculate so i use my old analog tester) i can lit a 10W bulb.
aniweis... im also making another set of inverters... for now. im ganna stick with this two....
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audioguru
Nobel Prize Winner
Canada
3761 Posts |
Posted - Nov 09 2006 : 11:17:02 AM
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quote:
Originally posted by shivick21
is there any other way to find if my oscillator working? can i add some LED to the pin 09 and 10? just enough to find it flipping?
No wonder your CD4047 oscillator doesn't work. You have the wrong pin as its output. Its pin 9 (input for external reset) is supposed to be grounded and its outputs are pins 10 and 11.
I don't know which schematic you are looking at. The link to the 500W inverter project that I posted before is gone now and I can't post the schematic here.
quote:
i have made one inverter w/o IC.
i use a 7.5VCT 750MA transformer and it generates around 400volts
i can lit a 10W bulb.
The transformer has your 12V battery switched by the transistors to each 3.75V half-winding so if it is a 120VAC transformer then its output voltage is a 384VAC p-p square-wave. The transformer's power rating is only 5.6W. |
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shivick21
Apprentice
Philippines
57 Posts |
Posted - Nov 09 2006 : 11:12:01 PM
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WHA~ Sorry~ im kinda sleepy that night... i just miss typed it.... there is no problem in my board layout. pin 11 and 10 is in the right place. but i dont know if the oscillator is working or not...
BTW.. I have saved somes schematics in my archives, i think the one u modified and some other inverter projects... ill just post a link here.. |
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shivick21
Apprentice
Philippines
57 Posts |
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12/120V inverter again
