Balun transformer using a drum-shaped core
AssigneeTDK Corporation
InventorsToshio Tomonari, Hiroshi Suzuki, Toshihiro Kuroshima
Life of this patent
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Abstract
A balun transformer includes: a drum-shaped core having a core unit and a pair of flanges arranged on both sides of the core unit; a plurality of terminal electrodes arranged on the flanges; a primary winding wound around the core unit, both ends of the primary winding being connected to the terminal electrodes; and a secondary winding wound around the core unit, both ends and a center tap of the secondary winding being connected to the terminal electrodes, wherein the secondary winding includes a first wire extending from one end to the center tap, and a second wire extending from the other end to the center tap, and the first wire and the second wire are wound around the core unit so as to extend along each other.
Claims20
A balun transformer comprising:
- a drum-shaped core having a core unit and first and second flanges arranged on both sides of the core unit;
- first to third terminal electrodes arranged on the first flange;
- fourth to sixth terminal electrodes arranged on the second flange;
- a first wire wound in a first number of turns around the core unit, the first wire having one end connected to the first terminal electrode and other end connected to the fourth terminal electrode;
- a second wire wound in a second number of turns around the core unit, the second wire having one end connected to the second terminal electrode and other end connected to the fifth terminal electrode;
- a third wire wound in a third number of turns around the core unit, the third wire having one end connected to the third terminal electrode and other end connected to the sixth terminal electrode,
- wherein the first number is different from the second and third numbers, and the second and third numbers are same as each other.
A balun transformer comprising:
- a drum-shaped core having a core unit and first and second flanges arranged on both sides of the core unit;
- a first electrode group arranged on the first flange constituted of a plurality of terminal electrodes arranged in line including at least a first terminal electrode located at a near end of the first electrode group viewed from a predetermined direction and a second terminal electrode located at a far end of the first electrode group viewed from the predetermined direction;
- a second electrode group arranged on the second flange constituted of a plurality of terminal electrodes arranged in line including at least a third terminal electrode located at a near end of the second electrode group viewed from the predetermined direction and a fourth terminal electrode located at a far end of the second electrode group viewed from the predetermined direction;
- a primary winding wound around the core unit, the primary winding having first and second ends;
- and
- a secondary winding wound around the core unit, the secondary winding having third and fourth ends and a center tap, the secondary winding including a first wire extending from the third end to the center tap and a second wire extending from the fourth end to the center tap, wherein
- the first end of the primary winding is connected to the first terminal electrode,
- the second end of the primary winding is connected to one of the second and third terminal electrodes,
- the third end of the secondary winding is connected to other of the second and third terminal electrodes,
- the fourth end of the secondary winding is connected to the fourth terminal electrode, and
- the center tap of the secondary winding is connected to one or more of the terminal electrodes.
A device having a circuit board and a balun transformer mounted on the circuit board, wherein
- the circuit board includes at least first to fourth land patterns,
- the balun transformer includes:
- a drum-shaped core having a core unit and a pair of flanges arranged on both sides of the core unit;
- a plurality of terminal electrodes arranged on the flanges;
- a primary winding wound around the core unit, both ends of the primary winding being connected to the terminal electrodes;
- and a secondary winding wound around the core unit, both ends and a center tap of the secondary winding being connected to the terminal electrodes,
- the terminal electrode connected to one end of the primary winding is connected to the first land pattern,
- the terminal electrode connected to other end of the primary winding is connected to the second land pattern,
- the terminal electrode connected to one end of the secondary winding is connected to the third land pattern,
- the terminal electrode connected to other end of the secondary winding is connected to the fourth land pattern, and
- the terminal electrode connected to the center tap of the secondary winding is connected to the second land pattern.
Dependencies are inferred from the claim text.