ALEXANDRIA, Va., May 19 -- United States Patent no. 12,633,849, issued on May 19, was assigned to Nanjing Chervon Industry Co. Ltd. (Nanjing, China).
"Power tool" was invented by Zhen Xu (Nanjing, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A power tool includes an electric motor including multi-phase windings; and a control circuit for controlling the electric motor to rotate. The control circuit includes a driver circuit including multiple switching elements having multiple driving states to drive the electric motor to rotate; a parameter detection module for detecting an electrical parameter of the control circuit; and a controller for outputting a pulse-width modulation (PWM) control signal to c...