ren_ADD Posted January 8, 2006 Author Report Share Posted January 8, 2006 AHhhh!!! ok now i know. It is only a mylar capacitor not any of the specials.thank you audioguru! Quote Link to comment Share on other sites More sharing options...
sureshv Posted January 10, 2006 Report Share Posted January 10, 2006 Hi. I had this unusual problem with the inverter when I connected the batteries. Initially at lower loads (50 watts) it worked fine. But when I started connecting additional loads (100 watts) and batteries in parallel, the inverter would work for 15 seconds and then stop functioning. The emitter resistors would get hot indicating a stuck oscillator. Finally, I managed to blow up the IC probably because of an inrush during one of those off cycles. The power transistors were all safe! In hindsight, I feel, the input voltages to the IC needs to be fed through a resistor of a nominal value say 100 ohms - the circuit consumes just about 10 mA. Secondly, a relay in the circuit that cuts of the low side supply to the square wave generator first followed by a delayed cut off the high side supply will reduce the load on the power line switch/ relay. Any one had similar experience? Quote Link to comment Share on other sites More sharing options...
audioguru Posted January 10, 2006 Report Share Posted January 10, 2006 Hi Sure,Welcome to our forum. ;DThe oscillator in a CD4047 is pretty simple and is guaranteed to work with a supply voltage of 3V to 18V or more (22V for TI). Since yours stopped then later blew-up, I think it was bad from the start.I agree that adding a 100 ohm resistor to feed its power is a good idea. Adding a 12V zener diode across it would be even better. ;D Quote Link to comment Share on other sites More sharing options...
sureshv Posted January 11, 2006 Report Share Posted January 11, 2006 My replacement circuit will have a 100 ohms resistor and a 12V zener (500mw). I will report modifications once I finish the project. Quote Link to comment Share on other sites More sharing options...
kachew Posted July 3, 2006 Report Share Posted July 3, 2006 hi there, i am kachew here....hehe....can i ask about the sine wave inverter circuit? did anyone try on the circuit post by MP? because i now have similar project on inverter too....my output also need be a sine wave output and surge capability 300W can anyone help me in this project coz after i read all the posts also not really understand and i;m weak in electronics theory...plz help me... :'(thanks Quote Link to comment Share on other sites More sharing options...
argeelektronik Posted July 8, 2006 Report Share Posted July 8, 2006 Quote Link to comment Share on other sites More sharing options...
audioguru Posted July 8, 2006 Report Share Posted July 8, 2006 Hello Aregee,You didn't say a word about the output stage of a sine-wave inverter you attached that works with PWM to be efficient.Does it work?How much power?Which Mosfets? Quote Link to comment Share on other sites More sharing options...
argeelektronik Posted July 23, 2006 Report Share Posted July 23, 2006 Quote Link to comment Share on other sites More sharing options...
audioguru Posted July 23, 2006 Report Share Posted July 23, 2006 It looks like the LM324 makes a 50Hz square-wave. The TL494 just breaks it up into a higher frequency so its average output voltage is half of 220V.Isn't the transformer made special to pass the high frequency from the TL494?Why doesn't it make a PWM sine-wave output? Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.