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  1. please guys, i have some problems with my inverter transformer designing. how do i choose the sizes of coil for the primary and secondary windings. its a bit confusing to me as this is my first time of trying to build an inverter transformer. what is the difference b/w for example 10ga, 10awg and 10swg in wire gauging. what is also the difference b/w enamel wire, magnetic wire and copper wires. can someone make a summary chart that would say e.g, for this VA of inverter transformer at 12v,24v,48v centre tap./110,220v output, this is the number of primary turns, this is the number of secondary turns, these are the sizes of coils that are suitable for transformer winding. At least it would make the job easier.thanks
  2. thanx audio guru. but sorry, some more questions; 1. does every power mosfet have the zener diode connected internally across their source to drain pins? 2. when using the cd4047 and cd 4001 ic for a simple msw inverter as done by kachew, what frequencies would be found at the output pins 10,11, and 13 respectively for an inverter of 50hz? 3.does the source to drain voltage(vds) matter when choosing power mosfets for inverter designs of supply voltages of between 24v and 48v? 4. can thyristors be used to substitute power mosfets in higher power inverter designs?
  3. hi audio guru, i now understand why you are called by that name. you answers are flawless. can u please help me answer the following questions?; 1. what are the functions of the two 1n5408 diodes connected back to back from the drain of the power mosfets to ground?. 2. can i achieve a back emf suppression by connecting the two diodes front to front and connect their cathodes to the positive of the battery? 3. lastly, is there no way one can connect a feedback to the cd 4047 to achieve a good voltage regulation as in sasi's sg3524 pwm inverter circuit?
  4. thanks indulis for your explanation, ante, can you please explain to me why the clamp consisting of a 62v zener and a 1n4002 diode for the 1.2kw power house inverter you posted was connected to the gate of the power mosfets rather than a bulk input capacitor/ battery as explained by indulis previously. how does the back emf suppression technique of connecting the bridge rectifier straight to the battery rather than through the 4 mosfets affect the inverter effeciency? secondly, since irf540 mosfets have low current but high vds ratings, can anyone conversant with mosfets advice me on which popular high current high vds mosfets to use to replace the low current irf540. can irfz44n/ irf3205 be suitable for a 24v application? thirdly, how do you the determine the value of components for snubber circuit for different sizes of inverter circuits. say if you want to build a 3kva inverter. lastly, if one wants to build 1kva continous power inverter with a surge power of say 2kva, what would be the safest wattage of the ouput transformer to use in this circumstace.
  5. can u guys try and explain the fillowing to me. In choosing a power mosfet for an inverter circuit; 1) what are the minimum power mosfet vds one should choose in a 12volts as well as a 24volts battery application. someone said, for a 12v application, the vds is 30v and for 24v application, it is 60v. 2) if i connect a high power bridge rectifier across the drains of the transformer driving mosfets, and connect the positive side of the rectifier to the battery, will this help in greatly suppresing the the back emf that would have destroyed the mosfets. what are the disadvantages. Do you have a better way of doing this for a higher power inverter (say a 3kva type)? transapax.
  6. please ante, you posted a 5000w electro-mechanical inverter. the author in his book talked about a free energy motor used in running an alternator for charging his batteries. if that is possible, it then means that there is a free way of charging batteries without depending on the national grid. does anyone have an idea how the free energy motor is constructed as it will be beneficial to me as my country produces less than one-tenth of her energy needs. i would be grateful if anyone can post that project.(free energy motor). transapax
  7. 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
  8. i came across a schematics of a 500w soft start pwm inverter circuit using sg3525a ic. unfortunately ,the circuirt was incomplete.does anyone have an idea of the complete circuit. i woul be grateful if it can be posted on the forum. come to think of it.you guys are great geniuses. doing a great job for humanity.
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