Isolation transformer

• US 6,512,437 B2
• Filed: 03/02/1999
• Issued: 01/28/2003
• Est. Priority Date: 07/03/1997
• Status: Expired due to Term

• Current Assignee: Furukawa Electric Company Limited
• Original Assignee: Furukawa Electric Company Limited
• Inventors: Jin, Dongzhi, Abe, Fumihiko, Mochizuki, Hajime
• Primary Examiner(s): Donovan, Lincoln
• Assistant Examiner(s): Nguyen, Tuyen T.
• Application Number:
  US09/254,385
• Publication Number:
  US 20020057164A1
• Time in Patent Office: 1,428 Days
• Field of Search: 336/83, 336/90, 336/170, 336/178, 336/120, 336/121, 336/122, 336/115-119, 336/130, 336/134, 310/90.5
• US Class Current: 336/178
• CPC Class Codes: H01F 2019/085 Transformer for galvanic isolation
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H01F 38/18 Rotary transformers

Abstract

An isolation transformer is provided having primary and secondary cores (2, 4) and primary and secondary coils (3, 5) with the primary coil and the secondary coil being disposed with a gap G provided therebetween. Each of the primary coil and the secondary coil is formed of a wire having at least two substantially parallel long sides, and a length of the two long sides in each of the wires is set to be longer than a distance between the two long sides in each of the wires. Each of the wires is wound to have a plurality of turns in a manner such that an outer one of the two long sides of each inner one of the turns is adjacent to an inner one of the two long sides of each respective adjacent outer one of the turns.

Claims

1. An isolation transformer comprising primary and secondary cores and primary and secondary coils,

wherein said primary coil and said secondary coil are disposed with a gap provided therebetween,

wherein each of said primary coil and said secondary coil is formed of a wire having a substantially rectangular cross section with at least two approximately parallel long sides, and a length of said two long sides in each of said wires is set to be longer than a distance between the two long sides in each of said wires,

wherein the primary and secondary coils are disposed in a manner such that the long sides of the wire of the primary coil are aligned with the long sides of the wire of the secondary coil, and

wherein each of said wires is wound to have a plurality of turns in a manner such that an outer one of said two long sides of each inner one of said turns is adjacent to an inner one of said two long sides of each respective adjacent outer one of said turns.

2. The isolation transformer according to claim 1, wherein:

said primary coil and said secondary coil each have an even number of windings,

an insulating gap is formed between the windings of the primary and secondary coils, and

an angle of 45°

±

25°

is formed between (i) a line connecting centers on both ends of the insulating gap formed between the windings of said secondary coil and (ii) a center line of said primary and secondary coils.