1st post, please go easy. So, I’ve been researching this out, playing with a starter kit, developing some thoughts of, “This seems cool, so how do I do it?” Now, I’m looking at a pure sine wave, at 60Hz.
So, what I can do now is create a square wave with 6 peaks on each wave, creating a VPP of 6V and RMS of 2V, if I am understanding the o-scope correctly. I am doing this off of 2 digital PWM pins and using them to fire 2 transistors off, using the Arduino 2560 Mega’s power. (Purely academic idea at this point.)
So, if I’m looking at this correctly, if I can create a pure sine wave, I can then fire it through transistors, stepping up current for each set, assuming they are chosen and wired correctly to pump through either one or multiple transformers and keep the pure wave signal… now to my questions:
There seem to be an infinite # of ways to create a pure sine wave, from RC circuitry, LC, shifters, using PWM, using transitors with capacitors, etc, and each one has advantages and disadvantages. So, if my idea’s are correct, how would one use the 2560Mega in conjunction with whatever else to accomplish this? (I understand a little bit about a lot, just enough to know that my understanding is below par to try this) I’m one who needs to understand the why, so any links that can explain some of this - big thank you!
An O-scope on my house mains produces a VPP of 328V on one leg, so, dividing by 2, I get 164V, and I can figure out that the RMS value would be 120V, for household AC current in the U.S. Following this logic, if one would create a pure wave power inverter, does it hold true that one would have to step transformer up from 12VDC to 164V, necessitating a larger than 10:1 transformer to achieve an RMS power of 120V?
This part confuses me, if I am attempting to connect one transistor to another, say a NPN transistor to drive another transistor, would that transistor have to be a PNP transistor? At first, I didn’t think about it, but it seems that if positive voltage is driving the NPN base, and flow is negatively charged, than it’d have to reverse logic to PNP to keep stepping, although, I read that NPN is more efficient, so is it possible to connect an NPN straight to another NPN resistor?
Ignoring power losses and heat factors, etc., and realizing everywhere else it’s said to schematic the hardware first and work to the programming, I understand that, but I really am just playing around and learning which direction to take this, is trying to get a pure sine wave signal/control circuit right off the bat a bad idea or might I be on the right track?
Side note, this is nothing more than a hobby for me, I don’t work in the field, but it interests me and I know I don’t know a whole lot, but just trying to expand on what I know and then go further,