Inverter building using Wiseguys Power board and the Nano drive board

Author	Message
KeepIS Guru Joined: 13/10/2014 Location: Australia Posts: 1864	Posted: 04:10am 06 Apr 2024       On of the neat features in the Nano Code is a software current limit. The Over current settings in "Setup Menu" are for this Code over current trip. The main setting is for the current trip point, this is not to be confused with the Hardware over current trip and Reset button, the hardware AC over current setting is made via a 10 turn variable resistor.   The current trip setting is for the software trip, it flashes the Run LED fast at the over current point and displays a * character after the "Trip" text on the LCD. As the current increases the Controller starts to ramp down the AC voltage and then after increasing current, it cuts the Gate enable to stop SPWM drive to the Power stage. It recovers itself when the current drops. All with soft ramp up/dn. Setting the cutoff to a high enough value obviously disables it. I guess the usability depends on your system, but it's a nice feature to have available and deserves more investigation when I get a full Nano system running in anger. Test Mode is brilliant: It allows you to run the Controller with no power board (drive lead unplugged) or run the power stage on a separate supply for testing independent of the controller. The system will run from 0Vdc up, the controller technically covers an inverter from 24v (18v) to a 48v (58v). I rectified an small error in my own test code that stopped it working correctly when  an optional low voltage cutout I included was set to 0. Test mode allows you to run the controller with virtually nothing but a USB cable supplying 5v to the Nano, all under voltage cutouts are bypassed, but you can play with over current settings, look at waveform, adjust current sensors and etc.. With around 15v from a current limited power supply applied to the Inverter, and some smaller Power board Caps (less stored power), you can look at AC output, power board waveforms and test the complete system with it just loafing along. You could, on a first power up, slowly raise the DC voltage from around 15v all the way up to 54v **if your Toriod is wound for a 48v system** and monitor current, and even better if you can set the power supply for low current trip, it should save unexpected blowups, especially with minimal Caps, or even better, None, for a first run. Some really neat features included in this Nano controller  programming by "Poida" and the Controller interface and Power board design by "Wiseguy". .