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:
Jan. 24, 2012
Filed:
Jun. 22, 2009
Ta-yung Yang, Milpitas, CA (US);
Pei-sheng Tsu, Taipei County, TW;
Shih-jen Yang, Taipei County, TW;
Yi-min Hsu, Taichung, TW;
Chung-hui Yeh, Taipei County, TW;
Ta-Yung Yang, Milpitas, CA (US);
Pei-Sheng Tsu, Taipei County, TW;
Shih-Jen Yang, Taipei County, TW;
Yi-Min Hsu, Taichung, TW;
Chung-Hui Yeh, Taipei County, TW;
System General Corporation, Sindian, Taipei County, TW;
Abstract
A BLDC (brushless direct current) motor system of the present invention includes a control circuit, a sequencer, a driving circuit, and a BLDC motor. The control circuit determines the maximum torque and the maximum speed of the BLDC motor. The control circuit includes an over-current detection circuit to generate a reset signal in response to a switching current of the BLDC motor. The reset signal is generated when the switching current of the BLDC motor exceeds a threshold. A pulse width of the PWM signal is correlated to the level of a speed-control signal and the level of the torque-control signal. The pulse width of the PWM signal is also controlled by the reset signal generated by the over-current detection circuit.