Patent ID: 11863106
Assignee: MAHLE INTERNATIONAL GMBH
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 2:
3. A method for calculating a DC current consumption IS of a three-phase brushless DC (BLDC) motor, the method being performed by a microcontroller of a power supply control circuit of the BLDC motor, the method comprising:
amplifying three voltages VSh1, VSh2, and VSh3 corresponding to three phase currents ISh1, ISh2, and ISh3 of the BLDC motor across three shunt resistors RSh1, RSh2, and RSh3for phase current sensing, respectively;
performing an offset correction of the three voltages VSh1, VSh2, and VSh3;
obtaining a total voltage VShT by summing the three voltages VSh1, VSh2, and VSh3 with a single summing filter, wherein the three voltages VSh1, VSh2, and VSh3 represent direct input values of the single summing amplifier;
obtaining a filtered voltage VO by low-pass filtering the total voltage VShT; and
calculating the DC current consumption IS, according to the following equation:, I
   S
  
  =
  
   
    V
    O
   
   K
  
 

wherein K=RTotal*GainTotal,
wherein RTotal is the equivalent resistance of the three shunt resistors RSh1, RSh2, and RSh3, and
wherein GainTotal is the total amplification factor of the three amplifiers.