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. 11, 1997
Filed:
Feb. 28, 1995
Applicant:
Inventor:
Larry B Li, San Jose, CA (US);
Assignee:
SGS-Thomson Microelectronics, Inc., Carrollton, TX (US);
Primary Examiner:
Int. Cl.
CPC ...
H02K / ; H02P / ;
U.S. Cl.
CPC ...
318439 ; 318138 ; 318254 ;
Abstract
A stator coil driver circuit for a brushless DC motor, with an improved current mirror, is disclosed. The improved current mirror has a first transistor which conducts current and a second transistor configured to mirror the current of the first transistor. Additionally, the improved mirror circuit includes a unity gain amplifier connected in between the gates of the first and second transistor. The effect of the unity gain transistor is to provide for a faster turn-off of the second transistor and reduce oscillation of the circuit.