Patents by Inventor Martti Varpela

Martti Varpela 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).

  • Switching device combination for capacitive loads connected to direct voltage
    Patent number: 7365622
    Abstract: This publication discloses a switching device combination for capacitive loads (3) connected to a direct voltage. The switching device combination includes an actual switch component (1) for connecting voltage to the capacitive load (3), a charging switch component (2) for connecting charging voltage to the capacitive load in the initial stage, which charging switch component is dimensioned for a lower current than the actual switch component (1), a controller component (4), by means of which the actual switch component (1) is controlled from an open state to a closed state and vice versa, with the aid of a mechanical lever (5), which is connected to a first shaft (6), and delay elements (11) for delaying the connection of the actual switch component (1), so that the closed charging switch component (2) will have time to charge the capacitive load (3) before the connection of the actual switch component (1).
    Type: Grant
    Filed: November 3, 2004
    Date of Patent: April 29, 2008
    Assignee: ABB OY
    Inventors: Risto Kajan, Erkki Rajala, Mikael N{dot over (a)}hls, Simo Pöyhönen, Martti Varpela, Markku Talja
  • Switching device combination for capacitive loads connected to direct voltage
    Publication number: 20070035909
    Abstract: This publication discloses a switching device combination for capacitive loads (3) connected to a direct voltage. The switching device combination includes an actual switch component (1) for connecting voltage to the capacitive load (3), a charging switch component (2) for connecting charging voltage to the capacitive load in the initial stage, which charging switch component is dimensioned for a lower current than the actual switch component (1), a controller component (4), by means of which the actual switch component (1) is controlled from an open state to a closed state and vice versa, with the aid of a mechanical lever (5), which is connected to a first shaft (6), and delay elements (11) for delaying the connection of the actual switch component (1), so that the closed charging switch component (2) will have time to charge the capacitive load (3) before the connection of the actual switch component (1).
    Type: Application
    Filed: November 3, 2004
    Publication date: February 15, 2007
    Inventors: Risto Kajan, Erkki Rajala, Mikael Nahls, Simo Poyhonen, Martti Varpela, Markku Talja