I am looking for a faster way to control output voltage for a buck converter. This buck converter has its own fet driver and I am not willing to change it. I really only need the signal to run the gate driver.
A little about the project
60 khz
0-100 percent duty cycle
voltage mode control
current limiting, would be nice, but not necessary. I do have an ACS758 sensor on board if that the MCU will be attached to so its not a big deal to do it that way. It dosent hurt my FET is way overkill and I have desat protection.
350-600 volt input, about 0-350v output 30 amps
How should I go about this?
Ideally I want my MCU to set the target voltage (0-5V) and have something like a TL494 take that voltage as its setpoint/target voltage and do all the work to maintain that setpoint. I have been wildly unsuccessful at finding such a chip. everything seems to generate its own internal reference.
If possible I want to stick with analog since its much easier and more versatile, but if I have no other option I could go with I2C.
Right now I am using the arduino to measure voltage and set duty cycle. the loop runs at about 10 khz, it works great for dumping excess electricity into a heating element, but when summer rolls around I want to be putting that power into the DC bus of the VFD drive that runs my air conditioning and I want something much faster to be able to not dip or overshoot during rapidly changing current draws.
Any help appreciated