US 12,470,158 B2
Motor system of accurate back-electromotive force detection and operation method thereof
Ming-Tsan Lin, Keelung (TW); Zi-Xuan Huang, Nantou County (TW); and Yi-Shiang Ouyang, Miaoli County (TW)
Assigned to ARTERY TECHNOLOGY COMPANY, Hsinchu (TW)
Filed by Artery Technology Company, Hsinchu (TW)
Filed on Mar. 5, 2024, as Appl. No. 18/595,450.
Claims priority of application No. 202311325528.1 (CN), filed on Oct. 13, 2023.
Prior Publication US 2025/0125748 A1, Apr. 17, 2025
Int. Cl. H02P 6/182 (2016.01); H02K 11/00 (2016.01); H02K 11/33 (2016.01); H02P 6/15 (2016.01)
CPC H02P 6/182 (2013.01) [H02K 11/0094 (2013.01); H02K 11/33 (2016.01); H02P 6/157 (2016.02); H02P 2207/05 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A motor system comprising:
a brushless direct current (BLDC) motor comprising a first winding, a second winding and a third winding, the first winding, the second winding and the third winding being coupled to each other at a neutral node;
a driving circuit comprising:
a first set of switches coupled to the first winding, and configured to output a pulse width modulation driving signal to the first winding;
a second set of switches coupled to the second winding, and configured to couple the second winding to a ground terminal; and
a third set of switches coupled to the third winding, and configured to float the third winding;
a voltage divider circuit comprising:
a first resistor comprising a first terminal coupled to the third winding, and a second terminal;
a second resistor comprising a first terminal coupled to the second terminal of the first resistor, and a second terminal configured to optionally receive a control voltage or a ground voltage; and
a bypass diode comprising a first terminal coupled to the first terminal of the first resistor, and a second terminal coupled to the second terminal of the first resistor; and
an analog-to-digital converter (ADC) coupled to the voltage divider circuit and configured to receive a back electromotive force (back-EMF) signal from the second terminal of the first resistor to enable the second terminal of the second resistor to receive the control voltage or the ground voltage according to the back-EMF signal, and determine a back-EMF zero crossing point according to the back-EMF signal.