Patents by Inventor Bertil Hammarlund

Bertil Hammarlund 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).

  • Disconnecting thyristors from thyristor controlled reactance
    Patent number: 4096431
    Abstract: Apparatus for phase compensation of AC networks includes a transformer and at least one reactance element and a control device such as a thyristor to control the reactive power consumed by the reactance element. The control device is connected to reactance element and to the transformer so that the control device can be switched out of the circuit leaving the reactance element still connected to the AC network through the transformer.
    Type: Grant
    Filed: March 21, 1977
    Date of Patent: June 20, 1978
    Assignee: ASEA Aktiebolag
    Inventor: Bertil Hammarlund
  • Means for current measuring in static convertors
    Patent number: 4013952
    Abstract: For measuring the load current in a static convertor, there are provided a direct current measuring device on the direct current side of the convertor and an alternating current measuring device on the alternating current side. These measuring devices are connected by a dominance coupling arrangement to the output side of the measuring device. There the signal is fed to a control pulse transducer, which controls the convertor in accordance with the greatest of the signals fed by the measuring device.
    Type: Grant
    Filed: February 27, 1975
    Date of Patent: March 22, 1977
    Assignee: Asea Aktiebolag
    Inventors: Bertil Hammarlund, Gote Liss