the PWM/driver board only has 3 8pin chips and one 14 pin chip
you could make this for only a few 100 watts or up to what ever you need the only diference is the output mosfets or IGBT's
and it will fit in a very compact size
what gets me is why does the store bought stuff costs so dam much , I have less then $10 of chips in this circuit and the only parts that could rise the price is the mosfets and they all ready use those in a MSW inverter, no reason for MSW inverters to exist , I guess they think they can charge more because they are better and people do not know that it would not cost them anymore to make a Full Sine
I am currently laying out the P.C. BOARD , I will upload the latest circuit tonite after I add some text labeling to it
you will need a min. of + - 80volts to get 120ac , you could connect 14 12v batteries in series to get your + - volts that would be 168 volts[ Parent ]
I have got to say, I'm quite excited to see what you are working on. I have heard of digital pwm driven audio amplifers... but never saw any explination as to some of the back ground theory let alone actual schematics.. and Like I mentioned eairler, I have done quite a bit of web searching. I guess I just assumed if I could find little to know info on standard pwm inverters, that I wouldnt stand a chance of finding any info on any sinewave inverters.... especially developed for higher voltages.
Could you refer me to any web sites that might explain more of what's going on behind the schematics that you have posted ? I'm a amateur radio operator, and most of my electronic skills ( what little there is ! haha ) is primairly in linear electronics, and I know a whole lot less in digital, especially in power circuits.
When I can get a little time, I'm going to download the mfg's docs to the chips you are using etc.
John II[ Parent ]
Idealy I need an inverter that can operate on an input of between 105vdc and 160vdc. I guess this would be the normal operational levels between a 120v bank of standard deep cycle lead acid batteries ?
I have printed off all of your work that you have published... as soon as I get the time, I'm going to print off the chip specs as well. I have to say... right now I don't understand exactly what's going on within the circuit you have :( But I hope too soon : ) It sounds so promising, yet alot more simple then a CPU based setup.
Do you belive your circuitry would be adaptable to my situation where I need aprx. 105vdc to 160vdc input and 120vac output ? would your circuit drive a step up transformer so that 120vac RMS would be availalbe at the low end of 105vdc input, and in about 5 to 8 kw in size ?
A DC/DC would be best I will be posting one of those also ,in your case you would put 100 -->> 200 volts in and get +-100 volts out for the FSW. I am going to use 48volts for my DC/DC , hopefully I will be able to soon Document the Schematics, I have been building and when I get a working one built then I add the correct values[ Parent ]
