audioguru Posted October 13, 2006 Report Share Posted October 13, 2006 I built the original and never returned here again. I was busy trying to figure out why do the Inverter keeps on burning Electric Fans.Hi Wild Swan,Our original 500W inverter had errors so it didn't work. I helped correct the errors two and a half years ago. My corrected circuit recently was deleted from the project. Which circuit did you make?What happens to its output when it is loaded with more than only 50W?Do you have a fully charged car battery powering it through very heavy wires?Maybe its frequency is wrong. Quote Link to comment Share on other sites More sharing options...
WildSwan Posted October 13, 2006 Report Share Posted October 13, 2006 My bad. Very bad! I did your version Audioguru... but my Frequency is 50Hz when the AC freq in the Philippines is 60Hz.I will try to redi it again.Hi Wild Swan,Our original 500W inverter had errors so it didn't work. I helped correct the errors two and a half years ago. My corrected circuit recently was deleted from the project. Which circuit did you make?What happens to its output when it is loaded with more than only 50W?Do you have a fully charged car battery powering it through very heavy wires?Maybe its frequency is wrong. Quote Link to comment Share on other sites More sharing options...
audioguru Posted October 13, 2006 Report Share Posted October 13, 2006 My bad. Very bad! I did your version Audioguru... but my Frequency is 50Hz when the AC freq in the Philippines is 60Hz.Then your fans and 60Hz transformer will be overloaded with a load more than about 400W. It is easy to fix. Change the 47k resistor at the CD4047 oscillator to 39k.Did you use a 12V-0-12V 50A transformer? It should be 600VA. Quote Link to comment Share on other sites More sharing options...
ired Posted October 14, 2006 Report Share Posted October 14, 2006 hai all, i had just join this forum, i would like to know about the calculation of 600 VA ups, and it using SG 3524 as the inveter. thanks before :) Quote Link to comment Share on other sites More sharing options...
WildSwan Posted October 14, 2006 Report Share Posted October 14, 2006 Thanks Audioguru... yes, I have my Xformer customized and it is 12-0-12 50A primary and 220 volts secondary.Then your fans and 60Hz transformer will be overloaded with a load more than about 400W. It is easy to fix. Change the 47k resistor at the CD4047 oscillator to 39k.Did you use a 12V-0-12V 50A transformer? It should be 600VA. Quote Link to comment Share on other sites More sharing options...
audioguru Posted October 14, 2006 Report Share Posted October 14, 2006 hai all, i had just join this forum, i would like to know about the calculation of 600 VA ups, and it using SG 3524 as the inveter.Hi Ired,Welcome to our forum. ;DA discussion about the calculations for this 500W square-wave inverter is here:http://www.electronics-lab.com/forum/index.php?topic=8609.0It is an inverter, not a UPS. Quote Link to comment Share on other sites More sharing options...
kachew Posted November 23, 2006 Report Share Posted November 23, 2006 hi guyz,just wants to ask u guyz how to increase the voltage if i'm using mosfet and center tap tranformer to make the modified sine wave inverter? cos currently i notice that my transformer needed is too bulky....i need to make the inverter portable...thanks for u guyz help.... ;) ;) ;) Quote Link to comment Share on other sites More sharing options...
kachew Posted November 23, 2006 Report Share Posted November 23, 2006 hi guyz,just wants to ask u guyz how to increase the voltage if i'm using mosfet and center tap tranformer to make the modified sine wave inverter? cos currently i notice that my transformer needed is too bulky....i need to make the inverter portable...thanks for u guyz help.... ;) ;) ;) Quote Link to comment Share on other sites More sharing options...
audioguru Posted November 23, 2006 Report Share Posted November 23, 2006 The transformer needs to be big for it to have a high power rating because the mains frequency is very low.The turns ratio between the primary and secondary determines the output voltage. Quote Link to comment Share on other sites More sharing options...
kachew Posted November 23, 2006 Report Share Posted November 23, 2006 hi audioguru,can i use a smaller trafo with more winding on it? i plan to make the trafo myself ;D Quote Link to comment Share on other sites More sharing options...
audioguru Posted November 23, 2006 Report Share Posted November 23, 2006 You need to study about transformers.The size of the core is determined by the frequency and amount of magnetic flux it can have without saturating. You need a high flux to have a high power. High power also requires thick low resistance wire.The number of turns for the primary winding determines its inductance and leakage inductance that determines how much current the inverter draws without a load. Quote Link to comment Share on other sites More sharing options...
steven Posted November 23, 2006 Report Share Posted November 23, 2006 :)im back heres a super simple invertor ircuit i got in a kit Quote Link to comment Share on other sites More sharing options...
kachew Posted November 23, 2006 Report Share Posted November 23, 2006 dear steven,can i know the rating of the inverter? does the inverter need any transformer?what is output voltage and current for that inverter u shown? Quote Link to comment Share on other sites More sharing options...
kachew Posted November 23, 2006 Report Share Posted November 23, 2006 dear steven,can i know the rating of the inverter? does the inverter need any transformer?what is output voltage and current for that inverter u shown? Quote Link to comment Share on other sites More sharing options...
steven Posted November 23, 2006 Report Share Posted November 23, 2006 :)all i need now is 2 heatsinks and a transformer Quote Link to comment Share on other sites More sharing options...
audioguru Posted November 23, 2006 Report Share Posted November 23, 2006 Welcome back, Steven. ;DWe need to know the continuous power rating of your new inverter. Also please attach its schematic and parts list.It looks like a two transistor multivibrator driving the output transistors. Its output is probably a square-wave.It will be interesting to see if and how its design stops the multivibrator transistors from having avalanche breakdown.It will also be interesting to see how the circuit deals with inductive voltage spikes since it doesn't appear to have any protection diodes. Quote Link to comment Share on other sites More sharing options...
steven Posted November 23, 2006 Report Share Posted November 23, 2006 :) Quote Link to comment Share on other sites More sharing options...
steven Posted November 23, 2006 Report Share Posted November 23, 2006 :)ive allready mounted the heatsinks on the 2 transistors on the main board, just have to wire it up and add the 2 other transistors and big separate heatsinks to them and the transformer, ive typed out the instructions etc so here they are 12_to_240_vac_convertor_circiut.txt Quote Link to comment Share on other sites More sharing options...
audioguru Posted November 23, 2006 Report Share Posted November 23, 2006 Hee, hee. ;D ;D120W input makes only 60W to 70W output. Nearly half of the input power makes heat.No schematic? Quote Link to comment Share on other sites More sharing options...
audioguru Posted November 24, 2006 Report Share Posted November 24, 2006 Hi Sasi,How are you?What do you think about Steven's 50% efficient square-wave inverter?What do you think about the recent "deletion and corrections" that were made to our 500W inverter project?:http://www.electronics-lab.com/projects/power/033/index.html Quote Link to comment Share on other sites More sharing options...
steven Posted November 24, 2006 Report Share Posted November 24, 2006 hey guys the inverter i posted was a kit from jaycar electronics Quote Link to comment Share on other sites More sharing options...
audioguru Posted November 24, 2006 Report Share Posted November 24, 2006 hey guys the inverter i posted was a kit from jaycar electronics Does it work? Does it get really hot?It will be difficult to measure its square-wave output voltage accurately with a meter that doesn't measure AC with "true RMS" circuitry.Please post its schematic so we can see "what makes it tick". Quote Link to comment Share on other sites More sharing options...
MP Posted November 25, 2006 Report Share Posted November 25, 2006 Steven,It looks like a nice little kit. It is a shame they didn't include the transformer and heat sinks, but it looks like a nice simple kit for those who do not need a lot of power.Where will you use it? Did you purchase the kit for a specific purpose or for learning about inverters?MP Quote Link to comment Share on other sites More sharing options...
steven Posted November 27, 2006 Report Share Posted November 27, 2006 hey mp i brought the invertor kit as i was ciurious as to how something so small would do what they say it dose , ive had an inverter once but it dident put out enougth current to power a drill, in fact it just barely turend it and it lite a house hold globe only dimly so i wonder what this inverter will deliver, the transformer they recamended in the catalouge i have to buy it and the 2 heatsinks sepparate , it says in the instructions that for more output power add a 2n3055 transistor in parralell with each of the other 2 but dose it really matter which ones you use in the 2n3055 range with the different manufacterers , the ones that came with the kit have tesla written on them , im gona try a normal 2n3055 and see what goes, when i get the last bits i need , even if it dont deliver the current output i need ill try then, the parralell transistor setup for more power or ill use what i got for a bingo feul reactor i plan to try makeing , and for the hydrogen from water thing Quote Link to comment Share on other sites More sharing options...
MP Posted November 27, 2006 Report Share Posted November 27, 2006 The transformer that you choose will make quite a difference as to what you get out of this device. I assume the kit gave you a recommendation. You should be sure to get one as good as the recommendation or better.Regarding the 2N3055s, it does not matter which manufacturer as long as the transistor specs are correct.MP Quote Link to comment Share on other sites More sharing options...
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