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:
Nov. 24, 2009
Filed:
Mar. 30, 2007
Chunxing Deng, Shenzhen, CN;
Wenli Luo, Shenzhen, CN;
Chunxing Deng, Shenzhen, CN;
Wenli Luo, Shenzhen, CN;
Abstract
A motor driver includes an H-bridge having a first differential input, a second differential input, and a differential output; a sensing circuit coupled to the differential output of the H-bridge; a comparison and logic circuit coupled to the sensing circuit; a pair of pre-driver circuits coupled to the comparison and logic circuit for driving at least one of the differential inputs of the H-bridge; and a pair of level shifters coupled between the comparison and logic circuit and the sensing circuit. The pair of level shifters is used to assure that the Vof a pair of serially coupled transistors in the sensing circuit do not change with temperature, motor current, or voltage, and each includes a transistor receiving a reference current. The pair of level shifters each further includes a serially coupled diode and zener diode for preventing current from flowing from the differential output of the H-bridge to the level-shifting transistor.