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:
Dec. 14, 1999
Filed:
Feb. 10, 1998
Jean-Philippe Audic, Caen, FR;
Stephane Bouvier, Cairon, FR;
U.S. Philips Corporation, New York, NY (US);
Abstract
A control circuit controls the power supply to an electric motor and, comprises a power transistor NM of the NMOS type and a power transistor PM of the PMOS type arranged between two supply terminals VCC and GND, their intermediate node forming an output coupled to a coil Ei of the motor. The well B of the transistor PM is coupled to supply terminal VCC via an isolation diode ID, which has its anode connected to supply terminal VCC and has its cathode connected to the well B. The isolation diode ID ensures that the coil Ei is not short-circuited by the parasitic drain-well diode D of the transistor PM in case of a sudden power failure.