The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 31, 2026
Filed:
Apr. 15, 2024
Artery Technology Company, Hsinchu City, TW;
Ming-Tsan Lin, Keelung City, TW;
Zi-Xuan Huang, Nantou County, TW;
Yi-Shiang Ouyang, Miaoli County, TW;
ARTERY TECHNOLOGY COMPANY, Hsinchu City, TW;
Abstract
A sensorless motor circuit includes a brushless direct current motor, a driving circuit, a voltage adjustment circuit, a virtual neutral circuit, a comparator and a control circuit. The brushless direct current motor includes the first to third windings. The driving circuit outputs a PWM voltage to the first winding, couples the second winding to a ground terminal, and floats the third winding. The voltage adjustment circuit outputs a divided voltage according to a terminal voltage of the third winding. The virtual neutral circuit generates a virtual neutral voltage. The comparator compares the divided voltage with the virtual neutral voltage to generate a comparison signal. The control circuits determine a sampling time according to a duty cycle of the PWM voltage, and samples the comparison signal at the sampling time to detect a back electromotive force zero-crossing event, so as to perform commutation.