Part Number: TIDM-1000
Other Parts Discussed in Thread: AMC1301
Hello Team,
I posted this inquiry on behalf of my customer:
Hello everyone. I have some questions about the bus voltage sampling in three-phase vienna. I hope I can get your help.
Assuming that the circuit is stable, vbuspm is 300V. I calculate the vBusPM_ Fdbk according to the parameters on the schematic diagram is 1.55,
the formula is Vbus * Resitor Divider Gain* AMC1301 Opamp Gain * Diff Opamp Gain =Vbus * 0.00079 * 8.2 * 0.7978723 That is,300*0.00079*8.2*0.7978723=1.55
I know from this chart The theoretical value for vBusPM_pu is 300.15/454=0.661123348 That's no problem,
But through the three-phase VienNAPFC in the ADC bus voltage sampling program:
we konw the adcresult is
ADCRESULTX=4096*(ADCINy-VREFLO)/(VREFHI-VREFLO)
VREFHI=3.3V?
VREFLO=0V?
That is, it can be calculated from the above code
VIENNA_vBusPMMeas_pu=4096*（1.550-0+1.550-0+1.550-0+1.550-0）/(3.3-0)*0.000244140625*0.25*717.79/454=0.7426
This is very different from the measured 0.6776and theoretical values 0.661123348 in the table.This is where I'm a little confused.
Looking forward to your reply, thank you!
