US 12,255,562 B2
Current control method and motor control circuit
Haodong Wang, Jiangsu (CN); and Jianan Huang, Jiangsu (CN)
Assigned to JIANGSU DONGCHENG TOOLS TECHNOLOGY CO., LTD., Nantong (CN)
Filed by JIANGSU DONGCHENG TOOLS TECHNOLOGY CO., LTD., Jiangsu (CN)
Filed on Dec. 27, 2022, as Appl. No. 18/089,558.
Application 18/089,558 is a continuation of application No. PCT/CN2022/098288, filed on Jun. 11, 2022.
Claims priority of application No. 202110835779.9 (CN), filed on Jul. 23, 2021.
Prior Publication US 2023/0132553 A1, May 4, 2023
Int. Cl. H02P 23/14 (2006.01); H02P 23/00 (2016.01); H02P 25/03 (2016.01)
CPC H02P 23/14 (2013.01) [H02P 23/0004 (2013.01); H02P 25/03 (2016.02); H02P 2205/01 (2013.01); H02P 2209/11 (2013.01)] 20 Claims
OG exemplary drawing
 
10. A motor control circuit for controlling a motor to operate, the motor control circuit comprising:
a power supply, comprising a live wire and a natural wire;
a first rectification circuit and a second rectification circuit, connected in parallel between the live wire of the power supply and the natural wire of the power supply, and configured to rectify the power supply;
a driving circuit, wherein an output end of the first rectification circuit is connected to the motor through the driving circuit;
a sampling resistor, connected to the driving circuit; and
a controller, connected to an output end of the second rectification circuit through a voltage detection circuit, wherein the controller is configured to:
obtain a periodic waveform signal of a bus voltage;
collect a bus current value through the sampling resistor;
sample the periodic waveform signal for a plurality of times;
linearly fit a plurality of voltage values obtained at a plurality of sampling time points t to obtain a plurality of slopes;
obtain a power frequency f according to the plurality of slopes;
calculate a compensation current value according to the power frequency; and
generate a control signal according to the compensation current value and the bus current value to control the motor.