Patents by Inventor Matti Sula

Matti Sula 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).

  • Use of a rectified image voltage for controlling the switch on the primary side of a switched-mode power supply
    Patent number: 6608768
    Abstract: A switched-mode power supply has primary and secondary sides, and a transformer (M1) with a primary winding, a secondary winding and an auxiliary winding. The primary winding and the auxiliary winding are connected to the primary side, and the secondary winding is connected to the secondary side. A switch element (T3) is connected to the primary winding in order to interrupt a current flowing in the primary winding. The switched-mode power supply contains a freely oscillating circuit (R5, C3, R7, T1, T2, R8, R9, R10, R11) for generating switching pulses to the switch element (T3). A rectifying and charge storing coupling (D4, C5) is connected between the terminals of the auxiliary winding in order to generate such an image voltage which on the primary side represents a certain voltage of the secondary side.
    Type: Grant
    Filed: July 10, 2002
    Date of Patent: August 19, 2003
    Assignee: Salcomp Oy
    Inventor: Matti Sula
  • Use of a rectified image voltage for controlling the switch on the primary side of a switched-mode power supply
    Publication number: 20030030422
    Abstract: A switched-mode power supply has primary and secondary sides, and a transformer (M1) with a primary winding, a secondary winding and an auxiliary winding. The primary winding and the auxiliary winding are connected to the primary side, and the secondary winding is connected to the secondary side. A switch element (T3) is connected to the primary winding in order to interrupt a current flowing in the primary winding. The switched-mode power supply contains a freely oscillating circuit (R5, C3, R7, T1, T2, R8, R9, R10, R11) for generating switching pulses to the switch element (T3). A rectifying and charge storing coupling (D4, C5) is connected between the terminals of the auxiliary winding in order to generate such an image voltage which on the primary side represents a certain voltage of the secondary side.
    Type: Application
    Filed: July 10, 2002
    Publication date: February 13, 2003
    Applicant: Salcomp Oy
    Inventor: Matti Sula
  • Zero load device of power source
    Patent number: 5933334
    Abstract: To the output voltage (U.sub.o) of a switched-mode power supply (300) there is connected an adjustable current path (39), through which there is conducted a low current when the output current (I.sub.o) given by the power supply is zero or nearly zero. The signal by which the conductivity of the current path is adjusted can be received from any part of the switched-mode power supply where a current or a voltage behaves suitably as a function of the output current.
    Type: Grant
    Filed: January 7, 1998
    Date of Patent: August 3, 1999
    Assignee: NOKIA Technology GmbH
    Inventor: Matti Sula