I have few clarifications on the MCLV-2 board software and the schematics. I have attached the source code of AN2520 application noted, schematics of the board and AN1292 application note.
Q1. Referring to the userparams.h file
Code:
// Following parameters for MCLV-2 board
// Gain of opamp = 15
// shunt resistor = 0.025 ohms
// DC offset = 1.65V
// max current = x
// (x * 0.025 * 15) + 1.65V = 3.3V
// x = 4.4Amps
Does 4.4Amps represents the capability of the hardware to measure the phase currents or the maximum current the board can generate using FOC algorithm? I am not sure if i am making any sense. But suppose i reduce the 1.65V to 1V does it mean the board can measure and generate 6.1 Amps as per the formula above?
Q2. In the attachment from the AN1292 I don't understood the importance of the scaling factor? Can some one guide me to understand it? Why should i multiply with Q15(-0.5)
I am reading 2 to 3 Microchip application notes and source code together.