Transformer

Patent metadata

Field	Value
Publication number	US-10320305-B2
Application number	US-201414912568-A
Country	US
Kind code	B2
Filing date	Aug 8, 2014
Priority date	Aug 29, 2013
Publication date	Jun 11, 2019
Grant date	Jun 11, 2019

Abstract

A transformer is provided between a power supply, and a load with a resistance value R, and includes a two-terminal pair circuit composed of n-number of reactance elements that are mutually connected, where n is a natural number equal to or greater than 4. With respect to any value of the resistance value R of the load, an input impedance Z in of the two-terminal pair circuit has a real number component of k·R, where k is a constant, and an imaginary number component of 0. Such a transformer has a small size and a light weight, and does not need a coil, an iron core, and the like as used in a conventional transformer.

First claim

The invention claimed is:

1. A transformer provided between a power supply, and a load with a resistance value R, the transformer comprising:
a two-terminal pair circuit composed of n-number of reactance elements that are mutually connected, where n is a natural number equal to or greater than 4,
wherein, with respect to any value of the resistance value R of the load, an input impedance Z in of the two-terminal pair circuit has a real number component of k·R, where k is a constant, and an imaginary number component of 0,
wherein, in the case where reactances of four reactance elements are X 1 , X 2 , X 3 , and X 4 , the two-terminal pair circuit is composed of, starting from an input side, X 1 present on one line of the two-terminal pair circuit, X 2 present between two lines thereof, X 3 present on the one line, and X 4 present between the two lines, and the following condition is satisfied:
(1/ X 1 )+(1/ X 2 )+(1/ X 3 )=0∧ X 2 +X 3 +X 4 =0.

2. A transformer provided between a power supply, and a load with a resistance value R, the transformer comprising:
a two-terminal pair circuit composed of n-number of reactance elements that are mutually connected, where n is a natural number equal to or greater than 4,
wherein, with respect to any value of the resistance value R of the load, an input impedance Z in of the two-terminal pair circuit has a real number component of k·R, where k is a constant, and an imaginary number component of 0,
wherein, in the case where reactances of four reactance elements are X 1 , X 2 , X 3 , and X 4 , the two-terminal pair circuit is composed of, starting from an input side, X 1 present between two lines of the two-terminal pair circuit, X 2 present on one line thereof, X 3 present between the two lines, and X 4 present on the one line, and the following condition is satisfied:
X 1 +X 2 +X 3 =0∧(1/ X 2 )+(1/ X 3 )+(1/ X 4 )=0.

3. A transformer provided between a power supply, and a load with a resistance value R, the transformer comprising:
a two-terminal pair circuit composed of n-number of reactance elements that are mutually connected, where n is a natural number equal to or greater than 4,
wherein, with respect to any value of the resistance value R of the load, an input impedance Z in of the two-terminal pair circuit has a real number component of k·R, where k is a constant, and an imaginary number component of 0,
wherein, in the case where reactances of four reactance elements are X 1 , X 2 , X 3 , and X 4 , the two-terminal pair circuit is composed of: starting from an input side, a T-shaped circuit formed by X 1 present on one line of the two-terminal pair circuit, X 2 present between two lines thereof, and X 3 present on the one line; and X 4 present in parallel with a series unit of X 1 and X 3 , and the following condition is satisfied:
X 1 +X 3 +X 4 =0∧(1/ X 1 )+(1/ X 2 )+(1/ X 3 )=0.

4. A transformer provided between a power supply, and a load with a resistance value R, the transformer comprising:
a two-terminal pair circuit composed of n-number of reactance elements that are mutually connected, where n is a natural number equal to or greater than 4,
wherein, with respect to any value of the resistance value R of the load, an input impedance Z in of the two-terminal pair circuit has a real number component of k·R, where k is a constant, and an imaginary number component of 0,
wherein, in the case where reactances of four reactance elements are X 1 , X 2 , X 3 , and X 4 , the two-terminal pair circuit is composed of, starting from an input side, a first series unit of X 1 and X 2 present between two lines of the two-terminal pair circuit, and a second series unit of X 3 and X 4 present between the two lines, such that a mutual connection point in the first series unit and a mutual connection point in the second series unit are output terminals, and the following condition is satisfied:
X 1 +X 2 +X 3 +X 4 =0∧(1/ X 1 )+(1/ X 2 )+(1/ X 3 )+(1/ X 4 )=0.

5. A transformer provided between a power supply, and a load with a resistance value R, the transformer comprising:
a two-terminal pair circuit composed of n-number of reactance elements that are mutually connected, where n is a natural number equal to or greater than 4,
wherein, with respect to any value of the resistance value R of the load, an input impedance Z in of the two-terminal pair circuit has a real number component of k·R, where k is a constant, and an imaginary number component of 0,
wherein, in the case where reactances of five reactance elements are X A , X B , X C , X D , and X E , the two-terminal pair circuit is composed of, starting from an input side, X A present on one line of the two-terminal pair circuit, X B present between two lines thereof, X C present on the one line, X D present between the two lines, and X E present on the one line, and the following relationship is satisfied:
X A =−X B ∧X E =−X D ∧X C =X A +X E .

6. A transformer provided between a power supply, and a load with a resistance value R, the transformer comprising:
a two-terminal pair circuit composed of n-number of reactance elements that are mutually connected, where n is a natural number equal to or greater than 4,
wherein, with respect to any value of the resistance value R of the load, an input impedance Z in of the two-terminal pair circuit has a real number component of k·R, where k is a constant, and an imaginary number component of 0,
wherein, in the case where reactances of five reactance elements are X A , X B , X C , X D , and X E , the two-terminal pair circuit is composed of, starting from an input side, X A present between two lines of the two-terminal pair circuit, X B present on one line thereof, X C present between the two lines, X D present on the one line, and X E present between the two lines, and the following relationship is satisfied:
X A =−X B ∧X E =−X D ∧X C =X A ·X E /( X A +X E ).

7. A transformer provided between a power supply, and a load with a resistance value R, the transformer comprising:
a two-terminal pair circuit composed of n-number of reactance elements that are mutually connected, where n is a natural number equal to or greater than 4,
wherein, with respect to any value of the resistance value R of the load, an input impedance Z in of the two-terminal pair circuit has a real number component of k·R, where k is a constant, and an imaginary number component of 0,
wherein, in the case where reactances of six reactance elements are X A , X B , X C , X D , X E , and X F , the two-terminal pair circuit is composed of, starting from an input side, X A present on one line of the two-terminal pair circuit, X B present between two lines thereof, X C present on the one line, X D present between the two lines, X E present on the one line, and X F present between the two lines, and the following relationship is satisfied:
X A =X C =−X B ∧X D =X F =−X E .

8. A transformer provided between a power supply, and a load with a resistance value R, the transformer comprising:
a two-terminal pair circuit composed of n-number of reactance elements that are mutually connected, where n is a natural number equal to or greater than 4,
wherein, with respect to any value of the resistance value R of the load, an input impedance Z in of the two-terminal pair circuit has a real number component of k·R, where k is a constant, and an imaginary number component of 0,
wherein, in the case where reactances of six reactance elements are X A , X B , X C , X D , X E , and X F , the two-terminal pair circuit is composed of, start

Assignees

• Sumitomo Electric Industries
• National Univ Corporation Toyohashi Univ Of Technology
• National Univ Corporation Toyohashi Of Technology

Inventors

• Hirotsu Kenichi
• Shiga Nobuo
• Nakahata Hideaki
• Ohira Takashi
• Yamada Kyohei

Classifications

• H02M5/06 Primary

  using impedances · CPC title

• H02M5/293

  using semiconductor devices only · CPC title

• H03H7/38

  Impedance-matching networks · CPC title