Hi, I want to build an inverter for 120V and 600A current, according to the reference for field-effect transistors are well suited IRFP4568 plan to use 12pcs for 1 phase, who will advise can there be low-voltage modules for high current?
Re: inverter for 120V and 600A current
Posted: Sat Jul 18, 2020 11:39 am
by yaroslav
Well, since no one advised me, I will use a n mosfet, that's how will look the whole Assembly
Re: inverter for 120V and 600A current
Posted: Sat Jul 18, 2020 12:35 pm
by arber333
yaroslav wrote: ↑Sat Jul 18, 2020 11:39 am
Well, since no one advised me, I will use a n mosfet, that's how will look the whole Assembly
Well if you want to use mosfets you need to use transistor pair p and n to get halfh bridge for one phase. Then 3 phases...
What will you use for brains?
A
Re: inverter for 120V and 600A current
Posted: Sat Jul 18, 2020 1:09 pm
by johu
B6 bridge is all N-channel FETs not comparable to push-pull analog amplifier
Re: inverter for 120V and 600A current
Posted: Sat Jul 18, 2020 3:40 pm
by mikmur
hi yaroslav. i used igbt transistor AUIRGP50B60PD1E.
Re: inverter for 120V and 600A current
Posted: Sat Jul 18, 2020 4:15 pm
by bexander
What do you mean by 120V? Nominal or maximum voltage?
The FET mentioned IRFP4568 has a 150Vdss which leaves a small margin for voltage spikes. To be more safe I would look for closer to 200V transistors.
One option could perhaps be IRFP4668PBF.
If you want to use modules I think IGBT:s are the way to go. FET-modules tend to be very pricey for there performance.
Maybe source two toyota inverters and parallel the power stage MG1+MG2+MG1+MG2? Or one lexus RX450h inverter with all three powerstages in parallel?
Re: inverter for 120V and 600A current
Posted: Tue Aug 25, 2020 6:15 pm
by yaroslav
bexander wrote: ↑Sat Jul 18, 2020 4:15 pm
What do you mean by 120V? Nominal or maximum voltage?
The FET mentioned IRFP4568 has a 150Vdss which leaves a small margin for voltage spikes. To be more safe I would look for closer to 200V transistors.
One option could perhaps be IRFP4668PBF.
If you want to use modules I think IGBT:s are the way to go. FET-modules tend to be very pricey for there performance.
Maybe source two toyota inverters and parallel the power stage MG1+MG2+MG1+MG2? Or one lexus RX450h inverter with all three powerstages in parallel?
The voltage of the batteries 120v, I took as a basis. Transistors at 200 volts so that there was a reserve. I thought that there are transistors for such currents, but while I will parallel as on the Board to collect 12 pieces, I think igbt for high voltage is good to use
Re: inverter for 120V and 600A current
Posted: Fri Nov 13, 2020 7:28 am
by yaroslav
Hi all, I collected an inverter, but have difficulties, asking for help from the forum, can someone tell me, when working on the phases of the motor is very dirty sine, I suppose this is due to improper PCB layout and sub-zero tires, how to connect the drivers to the gates of a large number of field-effect transistors?
Re: inverter for 120V and 600A current
Posted: Thu Nov 26, 2020 2:35 am
by Thatguyoverthere
Can you post a picture of the waveform you see? Also check out this paper on oscillation between paralleled MOSFETS.
I took the signal with an oscilloscope, maybe even this is normal? But when I gave more current, it led to overheating of the transistors, one transistor in the bridge broke through due to overheating, those that are closer to the power supply are heated more than those transistors that are closer to the output terminals. I also took an oscillogram on the gates transistor, at first glance everything seems to be fine.
Re: inverter for 120V and 600A current
Posted: Sat Nov 28, 2020 8:00 pm
by yaroslav
Here is the waveform itself, and the view of the inverter itself unscrewed from the radiator
Re: inverter for 120V and 600A current
Posted: Sat Nov 28, 2020 8:04 pm
by yaroslav
Here are the signals on thHere are the signals on the gates mosfete gates mosfet