Part Number: TMDSHVMTRPFCKIT
Recently I was doing experiments with TMDSHVMTRPFCKIT, After looking at the hardware schematic diagram, I found that the rated current of the board is - 10A ~ 10A. The current amplification factor is 8.25 times, and the DC bias is 1.65V.
My question is that the signal conditioning circuit itself uses the reverse operational amplifier. That is to say, assuming the voltage at both ends of the sampling resistor is Va, the voltage input to the chip is (-8.25 * Va + 1.65). Processing in software is as follows:
offsetA= K1*offsetA + K2*(AdcMirror.ADCRESULT1)*0.00024414; //Phase A offset
offsetB= K1*offsetB + K2*(AdcMirror.ADCRESULT2)*0.00024414; //Phase B offset
offsetC= K1*offsetC + K2*(AdcMirror.ADCRESULT3)*0.00024414; //Phase C offset
clarke1.As=((AdcMirror.ADCRESULT1)*0.00024414-offsetA)*2*0.909; // Phase A curr.
clarke1.Bs=((AdcMirror.ADCRESULT2)*0.00024414-offsetB)*2*0.909; // Phase B curr.
That is to say, is the actual A/B phase current opposite to the current flowing through the resistance?
- experiments
