Patents by Inventor Ernst Gabriel

Ernst Gabriel 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).

  • DC operated electronic ballast for fluorescent light
    Patent number: 5751120
    Abstract: A device for operating lamps, such as fluorescent lamps includes an input protection circuit, a filter, a DC to DC converter, a power output stage, a lamp connecting circuit and a control circuit. The control circuit includes a pulse width modulator, a multivibrator and a start/stop controller. The pulse width modulator varies the duty cycle of a control signal supplied to the DC to DC converter based on a feedback signal from the DC to DC converter. The multivibrator assists in the control of the DC to DC converter. The start/stop controller initiates the operation of the power output stage when an output of the DC to DC converter reaches a predetermined level and halts the operation of the power output stage if a failure is detected.
    Type: Grant
    Filed: August 18, 1995
    Date of Patent: May 12, 1998
    Assignee: Siemens Stromberg-Carlson
    Inventors: Walter Zeitler, Ernst Gabriel