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. 28, 2006
Filed:
Jun. 17, 2004
Applicants:
Chih-shih Yang, Hsinchu, TW;
Kung-ching Hung, Taipei, TW;
Inventors:
Chih-Shih Yang, Hsinchu, TW;
Kung-Ching Hung, Taipei, TW;
Assignee:
Prolific Technology Inc., Taipei, TW;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02K 23/04 (2006.01);
U.S. Cl.
CPC ...
Abstract
A noiseless driving circuit for direct current (DC) motor is disclosed. The driving circuit uses a magnetic-field sensing circuit with a Hall sensor to sense the corresponding position of the permanent magnet rotor. According to the corresponding position of the permanent magnet rotor, a linear circuit generates a signal with trapezoid waveform for driving the coil of the DC motor. The coils of the DC motor perform soft switching operations without resulting backing electromotive force (BEMF). Therefore, the noise during the operation of the DC motor can be substantially reduced.