Patents by Inventor Jan Krtek

Jan Krtek 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).

  • Circuit arrangement of an inverted current rectifier with self commutation
    Patent number: 4326246
    Abstract: Inverted current rectifier with self commutation for smaller and medium output and three-stage commutation in which the disconnection of thyristors of the inverted rectifier and the current commutation in the phases are separated and the accumulated power of capacitors of the inverted rectifier is, without losses, discharged to the current source and thus to the load of the inverted rectifier.
    Type: Grant
    Filed: April 2, 1981
    Date of Patent: April 20, 1982
    Assignee: CKD Praha, oborovy podnik
    Inventors: Jiri Winkler, Milan Kondr, Richard Jelinek, Jaroslav Hlousek, Jan Krtek, Josef Cibulka, Vladimir Mlynar, Josef Simacek
  • Process of pulse duration modulation of a multi-phase converter
    Patent number: 4321663
    Abstract: A process of pulse duration modulation for improved voltage and frequency efficiency of a multi-phase converter. The sum of the time dependent voltage of a load phase and of an auxiliary time dependent voltage is formed, wherein the auxiliary time dependent voltage is the same for all converter phases. The pulse duration of the output voltage of each converter phase is modulated with said voltage sum.
    Type: Grant
    Filed: May 22, 1979
    Date of Patent: March 23, 1982
    Assignee: CKD Praha, oborovy podnik
    Inventor: Jan Krtek
  • Circuit arrangement for self-commutated inverters
    Patent number: 4317166
    Abstract: Circuit arrangement for inverters with three stage self-commutation suitable for large outputs and for parallel connection of main thyristors and separating reactors.
    Type: Grant
    Filed: January 2, 1980
    Date of Patent: February 23, 1982
    Assignee: CKD Praha, oborovy podnik
    Inventors: Jiri Winkler, Josef Cibulka, Jan Bryksi, Richard Jelinek, Jan Krtek, Vladimir Mickal, Jaroslav Hlousek, Milan Kondr
  • Test circuit for indication of deviation of source voltages from their set points
    Patent number: 4139788
    Abstract: A test circuit for determining when one of a number of source voltages deviates from its set point. Each source voltage has coordinated comparison circuit which compares the voltage with a preset value, and which has a limited range of output voltage. Each comparison circuit has its output connected to a switching circuit. The output of each switching circuit is connected to a short circuit coil of one coupling transformer. The coupling transformer is fed from an auxiliary current source through an auxiliary coil and has as output a pick-up coil connected to an evaluation device.
    Type: Grant
    Filed: June 23, 1977
    Date of Patent: February 13, 1979
    Assignee: CKD Praha, oborovy podnik
    Inventors: Josef Cibulka, Jaroslav Hlousek, Richard Jelinek, Jan Krtek, Jiri Winkler