Greetings,
I'm looking to build a 400Hz power supply for a piece of military or aviation equipment, some sort of gyroscope, that has a small BLDC motor.
The only information I have about it it's that it needs around 36V at 400Hz with three phases. The voltage can be squarewave.
It needs to be a project that I build, so I can't just buy a power supply for it.
I've investigated several ways of doing it and the trickiest part is the control section.
I need to drive 3 mosfets at 400Hz, two of them having the signal phase shifted by 120 and 240 degrees. I don't think I need an H-bridge (6 mosfets) for 0.8-1A.
I first thought about 555 timers, either using 3 outputs of a 558 or a 555 and a 556 for the shifted signals. I have no idea if it's capable of doing phase shifting.
The second option (which I want to avoid) is using a microcontroller with 3 PWM outputs and doing the shifting in software.
I'm not aware of any 3-phase control IC similar to those used in SMPS.
As a background, I've mostly worked with (and built) audio equipment and power supplies. I also did some microcontroller programming, but just because I had to, I'm no fan of it.
Thanks!