US 11,863,106 B2
Power supply control circuits for brushless DC (BLDC) motors
Juan Carrión González, Alboraya (ES); Carlos Domingo Màs, Requena (ES); Juan Francisco Pardo Peris, Xativa (ES); Carlos Sevilla Pavon, Valencia (ES); and Carlos Vernich Gimeno, Valencia (ES)
Assigned to Mahle International GmbH, Stuttgart (DE)
Filed by MAHLE INTERNATIONAL GMBH, Stuttgart (DE)
Filed on Jul. 15, 2021, as Appl. No. 17/377,156.
Application 17/377,156 is a continuation of application No. PCT/EP2020/050495, filed on Jan. 10, 2020.
Claims priority of application No. 19382023 (EP), filed on Jan. 15, 2019.
Prior Publication US 2021/0344290 A1, Nov. 4, 2021
Int. Cl. H02M 7/5387 (2007.01); H02P 6/14 (2016.01); G01R 19/25 (2006.01)
CPC H02P 6/14 (2013.01) [G01R 19/2513 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A power supply control circuit of a three-phase brushless DC (BLDC) motor, the power supply control circuit comprising:
an electrical network for calculating the DC current consumption IS based on three phase currents ISh1 ISh2 and ISh3 of the BLDC motor;
the electrical network comprising:
three shunt resistors RSh1, RSh2, and RSh3;
three amplifiers;
a single summing amplifier; and
a low pass filter,
wherein the three amplifiers are configured to amplify and perform an offset correction of three voltages VSh1, VSh2, and VSh3 that correspond to the three phase currents ISh1, ISh2, and ISh3 across the three shunt resistors RSh1, RSh2, and RSh3, respectively,
wherein the single summing amplifier is configured to sum the three voltages VSh1, VSh2, and VSh3 to generate a total voltage VShT,
wherein the three voltages VSh1, VSh2, and VSh3 represent direct input values of the single summing amplifier,
wherein the low pass filter is configured to provide a filtered voltage VO of the voltage VShT, and
wherein the DC current consumption of the BLDC motor IS is calculated according to the following equation:

OG Complex Work Unit Math
wherein K=RTotal*GainTotal, RTotal is the equivalent resistance of resistors RSh1, RSh2, and RSh3, and
wherein GainTotal is the total amplification factor of the three amplifiers.