Patents Represented by Attorney John P. Sumner, Esq.
  • Patent number: 5852557
    Abstract: The present invention is a DC to AC switching converter that does not require a dead zone. The output node of the classical switching pair is separated into two output nodes which eliminates the current path that made the dead zone necessary. Each of the switches are connected between +Edc and -Edc in a complimentary fashion. By eliminating the direct connection between the two switches, both switches can be operating simultaneously without any danger of failure. Both switch outputs pass through a current sensing feedback device and an output coil. The outputs of each coil are connected to the output of the switching converter having a filter capacitor connected to ground. This arrangement provides switching bias current during the zero current crossover point thereby eliminating the ringing and oscillation distortion that occurs in the dead zone. The desired output voltage waveform is a result of the summation of the two switch outputs after the high speed component has been removed through filtering.
    Type: Grant
    Filed: December 22, 1995
    Date of Patent: December 22, 1998
    Assignee: Pacific Power Source a Division of Thermo-Voltek
    Inventor: Mark Woodward