US 11,722,083 B2
Motor controller
Chien-Lun Chu, Hsinchu County (TW)
Assigned to Global Mixed-mode Technology Inc., Hsin-Chu (TW)
Filed by Global Mixed-mode Technology Inc., Hsin-Chu (TW)
Filed on Oct. 20, 2020, as Appl. No. 17/74,651.
Prior Publication US 2022/0123679 A1, Apr. 21, 2022
Int. Cl. H02P 21/22 (2016.01); H02P 27/08 (2006.01); H03K 7/08 (2006.01)
CPC H02P 21/22 (2016.02) [H02P 27/08 (2013.01); H03K 7/08 (2013.01); H02P 2205/01 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A motor controller configured to drive a motor, wherein the motor has a motor coil and a maximum rated current, and the motor controller comprises:
a switch circuit, configured to supply a motor current to the motor coil;
a pre-driver, configured to generate a plurality of driving signals to control the switch circuit, wherein the motor controller attains a function of maintaining a fixed output power by a plurality of current limit values, and the current limit values are predetermined values;
a current limit circuit, configured to store a current limit graph, wherein the current limit circuit receives a command signal for generating an output signal, the command signal has an input duty cycle, the command signal is used for adjusting a speed of the motor, and the current limit graph defines a relationship between a current limit of the motor current and the input duty cycle; and
a duty cycle control circuit, configured to store an output duty cycle graph.