Plural Current Supply To The Electromagnet Patents (Class 315/346)
  • Arc lamp stabilization
    Patent number: 5057747
    Abstract: Arc lamp output stability is improved by use of negative feedback which stabilizes arc position and intensity. Position and intensity of an image of the arc are sensed by optical sensors to control electromagnets which shift arc position so as to decrease wander and to control lamp current to decrease arc intensity variation.
    Type: Grant
    Filed: November 21, 1988
    Date of Patent: October 15, 1991
    Assignee: Hughes Aircraft Company
    Inventor: Alan R. Henderson
  • Method and apparatus for controlling the erosion of arc producing electrodes
    Patent number: 4162431
    Abstract: Apparatus and process for reducing the rate of erosion of electrodes between which an arc is sustained by the provision of a field coil around the electrode which is supplied with direct current and the oscillation of that direct current supply at a frequency in the range 5.times.10.sup.-1 to 1.times.10.sup.-4 Hz.
    Type: Grant
    Filed: August 15, 1977
    Date of Patent: July 24, 1979
    Assignee: Tioxide Group Limited
    Inventors: Allen P. George, Harold Homer, Christopher J. Richardson