I work at an industrial production plant where I push my tools around on a push cart.
I have a small 12v battery the size if a scooter battery which is strong enough to start a car.
I want to create an "inverter" circuit to give me 120v from the batt.
What I need help on: I need to choose an oscillator circuit/IC to create the 60hz ac signal. From there I can either boost the voltage with a discreet voltage amplifier and also a current buffer for power transformation. Or I can use a transformer for the voltage AND current amplification which would be so much easier but I think I may want to make it smaller with an SMPS power supply to boost voltage then a parallel transistor current amp(voltage follower).
What do you all think and can you help me on designing any of it? The oscillator can be very simple.
Well yesterday I bought an 800VA transformer that will step up 12 to 120v. I got it for $80.
Then I plan on making a simple wein bridge oscillator and driving a voltage follower(pushpull) to buffer the oscillator signal going to the transformer primary. Should be simple. I have all the parts I need and I will be able to produce a decent amount of power.
Shoot I just remembered, with 12v from a battery I will only be able to swing about 5v RMS...The transformers I use always amplify a bit more but I'd need to swing as close to rail as possible so maybe I should use a rail to rail opamp in my oscillator
Yea 60 -80A I have many large transistors....I deal with caraudio amplifiers that draw upto 200 - 300A...I need to use them in parallel.
About the voltage, I have 4 12v output on the transformer that I was going to put in parallel but instead I can place two sets in series for twice the step up so 5vrms x 10x step up is 50v when doubled will be 100v but like I said these trannies produce more voltage step up then they are rated.
Yea 60 -80A I have many large transistors....I deal with caraudio amplifiers that draw upto 200 - 300A...I need to use them in parallel.
About the voltage, I have 4 12v output on the transformer that I was going to put in parallel but instead I can place two sets in series for twice the step up so 5vrms x 10x step up is 50v when doubled will be 100v but like I said these trannies produce more voltage step up then they are rated.
Well if you are anywhere near NE Ohio (Cleveland) just come on over and I'll give you a pile of UPS inverters. 800 watts to 1.5 KW and some smaller. Keep in mind that many of these devices do not output a 60 Hz sine wave but a modified sine wave. Just scroll down to "Do I need Modified Sine Wave, or Pure Sine Wave"? Also you need to consider that an 800 watt inverter when powered by 12 volts under a full load will draw over 66 Amps and after efficiency is figured in over likely 70 Amps so I hope you have a real big battery. Heck, could have saved you the $80 you spent on a transformer as all the units I mentioned have transformers.
I live in California. It sounds like a good idea to buy one or get one already made like everyone suggest(car inverters are perfect and use smps!) however I wanted build one myself...
As far as battery capacity issues, I also want to implement a smart charger built in so I can charge it whenever I'm near an outlet. Light loads of a few amps won't drain it too quickly.
I live in California. It sounds like a good idea to buy one or get one already made like everyone suggest(car inverters are perfect and use smps!) however I wanted build one myself...
As far as battery capacity issues, I also want to implement a smart charger built in so I can charge it whenever I'm near an outlet. Light loads of a few amps won't drain it too quickly.
While I can appreciate the enthusiasm, believe me these are one of those things that are better bought than built. The basic inverters made for automotive use are really a good deal overall.
Yea 60 -80A I have many large transistors....I deal with caraudio amplifiers that draw upto 200 - 300A...I need to use them in parallel.
About the voltage, I have 4 12v output on the transformer that I was going to put in parallel but instead I can place two sets in series for twice the step up so 5vrms x 10x step up is 50v when doubled will be 100v but like I said these trannies produce more voltage step up then they are rated.