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:
Apr. 25, 2000
Filed:
Jan. 20, 1998
David Hayner, Austin, TX (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A voltage generation circuit (60, 62) is adapted to sense voltages on multiple windings (82, 84, 86) of a multi-phase brushless DC motor (22) during successive intervals of a rotation of the motor (22) in which the respective windings (82, 84, 86) are not being driven. The voltage generation circuit (60, 62) provides a different output voltage from the voltage used to drive the motor (22). In one embodiment, the voltage generation circuit (60, 62) includes a voltage boosting circuit (62) to increase the output voltage above the drive voltage. This voltage generation circuit (60, 62) may be advantageously combined with an electrically programmable read only memory (EPROM) (56) on a single integrated circuit chip. The voltage generation circuit (60, 62) generates the EPROM programming voltage without the need for a costly on-chip charge pump or off-chip DC-DC converter.