Patents by Inventor Martti Ojanen

Martti Ojanen 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).

  • Patent number: 8350541
    Abstract: There is provided a control circuit including a sampling controller configured to sample an output voltage of a power converter at an appropriate time slot by opening a control loop. A soft-start circuit configured to enable soft-starting of an internal soft-start reference voltage to start from the sampled output voltage and to control the internal soft-start reference voltage to a predetermined target value in order to pre-charge the output voltage close to an input voltage level, or to continue charging the output voltage to a predetermined output voltage value.
    Type: Grant
    Filed: January 31, 2008
    Date of Patent: January 8, 2013
    Assignee: Nokia Corporation
    Inventors: Martti Ojanen, Janne Tiisanoja
  • Patent number: 8054060
    Abstract: A switched mode power supply unit realized by an integrated circuit comprising a control circuit controlling the operation of the switched mode power supply unit, wherein the control circuit is configured to provide a plurality of different circuit configurations for different operating environments. The circuit configuration for the control circuit is defined by a control signal received by the control circuit.
    Type: Grant
    Filed: March 18, 2008
    Date of Patent: November 8, 2011
    Assignee: Nokia Coporation
    Inventors: Martti Ojanen, Hannu Virta
  • Patent number: 8019294
    Abstract: There is provided a control circuit of a switch mode power supply including a random number generator configured to form an optimized n-degree polynomial based on the minimum power-on cycle time in order to form a uniform distribution of output signals, a switch control block configured to control output signals of the switch control block such that the complementary output stages of the switch control block conduct at different times on the basis of the output signals received from the random number generator. and a dither control block configured to generate a synchronized dither current by minimizing glitches at each differential stage of a default reference current based on the output signals received from the switch control block, and to combine the generated synchronized dither current with a reference current of a voltage ramp generator.
    Type: Grant
    Filed: May 19, 2008
    Date of Patent: September 13, 2011
    Assignee: Nokia Corporation
    Inventors: Martti Ojanen, Hannu Virta
  • Publication number: 20090200996
    Abstract: A switched mode power supply unit realized by an integrated circuit comprising a control circuit controlling the operation of the switched mode power supply unit, wherein the control circuit is configured to provide a plurality of different circuit configurations for different operating environments. The circuit configuration for the control circuit is defined by a control signal received by the control circuit.
    Type: Application
    Filed: March 18, 2008
    Publication date: August 13, 2009
    Inventors: Martti Ojanen, Hannu Virta
  • Publication number: 20090174381
    Abstract: A controller for controlling a load output. In various embodiments, the controller may include a closed loop. In some embodiments, the closed loop may have a least one controllable characteristic. In one embodiment, the controller may be configured to control the at least one controllable characteristic in response to changes in the load.
    Type: Application
    Filed: December 26, 2008
    Publication date: July 9, 2009
    Inventors: Martti Ojanen, Hannu Virta, Simo Murtojarvi, Janne Tiisanoja
  • Publication number: 20090143032
    Abstract: There is provided a control circuit including a sampling controller configured to sample an output voltage of a power converter at an appropriate time slot by opening a control loop. A soft-start circuit configured to enable soft-starting of an internal soft-start reference voltage to start from the sampled output voltage and to control the internal soft-start reference voltage to a predetermined target value in order to pre-charge the output voltage close to an input voltage level, or to continue charging the output voltage to a predetermined output voltage value.
    Type: Application
    Filed: January 31, 2008
    Publication date: June 4, 2009
    Inventors: Martti Ojanen, Janne Tiisanoja
  • Publication number: 20090072872
    Abstract: There is provided a control circuit of a switch mode power supply including a random number generator configured to form an optimized n-degree polynomial based on the minimum power-on cycle time in order to form a uniform distribution of output signals, a switch control block configured to control output signals of the switch control block such that the complementary output stages of the switch control block conduct at different times on the basis of the output signals received from the random number generator and a dither control block configured to generate a synchronized dither current by minimizing glitches at each differential stage of a default reference current based on the output signals received from the switch control block, and to combine the generated synchronized dither current with a reference current of a voltage ramp generator.
    Type: Application
    Filed: May 19, 2008
    Publication date: March 19, 2009
    Inventors: Martti Ojanen, Hannu Virta
  • Patent number: 6184592
    Abstract: A method and system for the arrangement of a power supply with an expansion card which can be connected to an electronic device and comprises at least a first and a second circuit. The power supply is arranged in at least two stages, wherein at the first stage, at least one operating voltage (Vcc) is connected to the first circuit, and at the second stage, the at least one operating voltage (Vcc) is connected to the second circuit.
    Type: Grant
    Filed: November 25, 1998
    Date of Patent: February 6, 2001
    Assignee: Nokia Mobile Phones Limited
    Inventors: Jyri Rauhala, Sami Inkinen, Markus Suomi, Olli-Pekka Lunden, Martti Ojanen, Vesa Köppä, Ari Aho, Janne Kuusinen, Jouni Rapakko