Patents by Inventor Olivo Bulgarelli

Olivo Bulgarelli has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 5231338
    Abstract: A control circuit is used for driving a multiphase brushless DC motor. The back emf of a non-excited winding is sensed, and a control signal is generated when a sinusoidal signal on the winding crosses a reference voltage level. Commutation occurs when the control signal is generated. Masking circuitry inhibits sensing of back emf immediately after commutation for a time period which is sufficient to ensure that noise from commutation spikes has ceased.
    Type: Grant
    Filed: November 15, 1990
    Date of Patent: July 27, 1993
    Assignee: SGS-Thomson Microelectronics S.R.L.
    Inventors: Olivo Bulgarelli, Edgardo Balboni, Giulia Gianoli