hassan1980 Posted November 14, 2005 Report Share Posted November 14, 2005 Hi, AllDid anyone try to make inverter depending on mosfet power transistors? Quote Link to comment Share on other sites More sharing options...
Guest Kasamiko Posted April 23, 2006 Report Share Posted April 23, 2006 Here is the charger, we assembled this circuit seperatly for charging 12V 250AH battery with a current of 30A max (15.1V). set the float current 1A we used a stack of eight 2N3055 transisters with 0.1ohm 10watt emitter resistorSasi,I just cant find a 47 Ohms trimmer used for FLOAT adjustment for this charger..the lowest value available in our place is 100 Ohms..Any idea how can I modify it to used 100 Ohms trimmer?See attached image below..Thanksrhonn ;) ;) Quote Link to comment Share on other sites More sharing options...
kachew Posted July 7, 2006 Report Share Posted July 7, 2006 hi to all, actually i am also interested in all inverter project and i read all the posts by you guys but i have problem to download the shcematic... :-[ can anyone help me? ;D if u guys have the schematic can send to me by emails ? thanks i curently do a reserch on the inverters hope you guys can help me ;) ;)this is my emails adds [email protected] Quote Link to comment Share on other sites More sharing options...
audioguru Posted July 7, 2006 Report Share Posted July 7, 2006 Hi Kachew,A sinewave inverter schematic was posted that was a function generator IC making a sinewave that was amplified by a linear audio amp then stepped up with a transformer. because its amplifier is linear, it wastes a lot of power as heat. Quote Link to comment Share on other sites More sharing options...
acdc Posted July 7, 2006 Report Share Posted July 7, 2006 Hello Guyz,why cant i download any crts that posted here,im desperatly in need of an inverter above 1kvACDC Quote Link to comment Share on other sites More sharing options...
ante Posted July 8, 2006 Report Share Posted July 8, 2006 I couldn’t find any inverter for >1000Volts anywhere in the archives, are you sure you have seen it on E-Lab? Quote Link to comment Share on other sites More sharing options...
kachew Posted July 9, 2006 Report Share Posted July 9, 2006 Hi Kachew,A sinewave inverter schematic was posted that was a function generator IC making a sinewave that was amplified by a linear audio amp then stepped up with a transformer. because its amplifier is linear, it wastes a lot of power as heat.hi audioguru,did u all still continue on the project? i mean do you all still make any modification on the sinewave inverter? thanks Quote Link to comment Share on other sites More sharing options...
acdc Posted July 9, 2006 Report Share Posted July 9, 2006 Sorry Annte its Above 1000W Quote Link to comment Share on other sites More sharing options...
kachew Posted July 9, 2006 Report Share Posted July 9, 2006 hi i had been read all posts of the inverter ....but i cant dl the one with using the PWM for the inverter can anyone pls send me the link so i can hav a look on the circuit ...thanks ;D ;D Quote Link to comment Share on other sites More sharing options...
kachew Posted July 9, 2006 Report Share Posted July 9, 2006 the inverter i need to do is with all this spec:1) input voltage 10-15V dc2) lower input volatge warning 10.5V DC3) lower voltage protection : 10V DC4) static current: 0.5a5) output voltage :220V6) output freq: 50HZ7) output wave: modified sine wave8) surge capability : 300W9) continous power : 150W10) efficiency >90%11) output overloading proctection :150W12) high tempreture protectioncan i use the inverter with the square wave output ( that is done by kasamiko and audioguru) and filter it (using low pass filter) to be sine wave inverter?can anyone suggest anything to be modified from my circuit attached?thanks Quote Link to comment Share on other sites More sharing options...
audioguru Posted July 9, 2006 Report Share Posted July 9, 2006 can i use the inverter with the square wave output ( that is done by kasamiko and audioguru) and filter it (using low pass filter) to be sine wave inverter?I don't know how to filter such a high power circuit. Some UPS's use a custom-made "ferro-resonant" transformer and have a sine-wave output.can anyone suggest anything to be modified from my circuit attached?You didn't attach a circuit here. You attached a circuit without part numbers in another forum. Quote Link to comment Share on other sites More sharing options...
ante Posted July 9, 2006 Report Share Posted July 9, 2006 1000W = 1kW1000V = 1kV ;) Quote Link to comment Share on other sites More sharing options...
kachew Posted July 10, 2006 Report Share Posted July 10, 2006 dear audioguru,so sorry..hehe...i got confused since i enter so many inverters forum....this is the circuit i meant...so anyone can suggest how to modify this circuit? Quote Link to comment Share on other sites More sharing options...
kachew Posted July 10, 2006 Report Share Posted July 10, 2006 so sorry here i attach the part num too hehe... ;)R1=10MohmsR2=100ohmsR3= 1.3kohmsR4=5.60kohmsR5&R6=2.2KohmsCX=22pF trimmed capacitorC1&C2=22pF ceramicC3=8.2nF 100V MKTC4=10uF 16VC5=47uF 16VC6=470nF 400VD1= 5V 0.4WD2 & D3= 47V 1WQ1-Q2=BS170IC1=4060IC2=4013IC3=4047CR1=3.2768MHZ crystalT1=220ac/2X10V 2X2.2AF1=5A fuseF2=0.25A fuseL1=1H smoothing chokemy inverter is use for small application such as travel charger and for laptopsi was told to make modification on this circuit..can anyone suggest how can i improve the circuit? ;D Quote Link to comment Share on other sites More sharing options...
transapax Posted July 10, 2006 Report Share Posted July 10, 2006 hello nura, i would very much appreciate it if you can post the complete diagram of the sg3525a inverter circuit diagram by mr. bashin as i cannot lay my hand on the vol-19 of efy project. you can still send it to me on the on [email protected]. thanks Quote Link to comment Share on other sites More sharing options...
faizanbrohi Posted July 11, 2006 Report Share Posted July 11, 2006 hey also send a mail at [email protected] or [email protected] Quote Link to comment Share on other sites More sharing options...
grateful Posted July 20, 2006 Report Share Posted July 20, 2006 Hi,audioguru :)i'm interested in constructing a pure sinewave inverter. Do u know any books that talk about how to design this kind of inverter?the ferro-resonant transformer that u mean is it same as the ferromagnetic transformer ??? Quote Link to comment Share on other sites More sharing options...
audioguru Posted July 20, 2006 Report Share Posted July 20, 2006 Hi,audioguru :)i'm interested in constructing a pure sinewave inverter. Do u know any books that talk about how to design this kind of inverter?I don't know about any books.Make a very hot linear output stage, a cool but complicated PWM output stage or use an expensive ferroresonant transformer at the output of a square-wave output stage.the ferro-resonant transformer that u mean is it same as the ferromagnetic transformer ???/quote]Google has many links to explanations and sales of ferroresonant transformers. Quote Link to comment Share on other sites More sharing options...
acdc Posted July 20, 2006 Report Share Posted July 20, 2006 Guyz,Chk it out a nice peace of work http://w5jgv.com/inverter/index.htmcould any one see a way to devolop it furtherACDC Quote Link to comment Share on other sites More sharing options...
audioguru Posted July 20, 2006 Report Share Posted July 20, 2006 Chk it out a nice peace of work could any one see a way to devolop it furtherIt has a square-wave output so its peak voltage is too low to operate many electronic devices whose rectifier charges its main filter capacitor to the peak voltage of a sine-wave from the mains.It is smart enough to use Mosfets for reduced heating instead of the hot ordinary transistors in our 500W square-wave inverter project.Its circuit would be much more complicated if it was re-designed to produce a modified-sine-wave or true sine-wave output. Quote Link to comment Share on other sites More sharing options...
faizanbrohi Posted July 20, 2006 Report Share Posted July 20, 2006 Will a Ferrroresonant Transformer Produce a Sinewave from the Square wave input and one more thing , as shown in figure is it possible to use a simple transformer and then add a capictor at one end with some rating Quote Link to comment Share on other sites More sharing options...
audioguru Posted July 20, 2006 Report Share Posted July 20, 2006 I don't know how good is the sine-wave from a ferroresonant transformer that operates saturated and has a square-wave input. Since its primary is saturated then I don't know how high is its input current. A ferroresonant transformer is rare so probably is very expensive. Quote Link to comment Share on other sites More sharing options...
faizanbrohi Posted July 20, 2006 Report Share Posted July 20, 2006 I think just using a simple LC Circuit at the output will be goood. but the problem will come as the RC circuit produces a sawtooth if a square wave is input . i don't know what happens to a LC Circuit , it would produce a sine wave , but will not be linear Quote Link to comment Share on other sites More sharing options...
audioguru Posted July 20, 2006 Report Share Posted July 20, 2006 If you tune a winding on a transformer with a capacitor and drive it with a high impedance so the Q remains high, then the output would be a perfect sine-wave without a load and the voltage would be infinite, then turn into a square-wave at the normal voltage when a load is added. Quote Link to comment Share on other sites More sharing options...
faizanbrohi Posted July 22, 2006 Report Share Posted July 22, 2006 Well amazingly i found a UPS Inverter . and well it is quite complicated , dual layer PCB and all that stuff . i cannot use the parts in it , beacause it is my dad's office UPS and it is dead . so here are some of the things i found .* 4 mosfets IRF240 , 2 sets in parallel .* BUZ11 mosfet* Transformer ( Don't know if it is a ferroresonant Transformer or not )5 wires coming out of the input side , one is connected to battery directly. 4 wires coming out from the Input side . * 4 Logic Gates IC , like CD4077 , CD 4093 , TC 4093 and MC14081* One Quad amp LM339Now condsidering the following components , i think the Logic gates produce a approximation sine wave and then is filtered into sinewave with a LM339 Quad amp and then Mosfets are used to increase the current , THen THe transformer does the step up .. All in all it is producing a approximation sine wave , i thinkwhat do you think ? comment Quote Link to comment Share on other sites More sharing options...
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