Filtering induction device

• US 6,707,366 B2
• Filed: 04/22/2002
• Issued: 03/16/2004
• Est. Priority Date: 04/30/2001
• Status: Expired due to Fees

• Current Assignee: Delta Electronics Incorporated
• Original Assignee: Delta Electronics Incorporated
• Inventors: Hsu, Han-Cheng, Ko, Wen-Te
• Primary Examiner(s): Nguyen, Tuyen T.
• Application Number:
  US10/127,288
• Publication Number:
  US 20020158738A1
• Time in Patent Office: 694 Days
• Field of Search: 336/65, 336/83, 336/192, 336/200, 336/206-208, 336/232, 361/301.1, 361/306.2, 361/306.3, 361/763, 361/821
• US Class Current: 336/200
• CPC Class Codes: H01F 17/00 Fixed inductances of the signal type coils in general H01F5/00; inductors without a potential-jump or surface barrier specially adapted for integrated circuits, details thereof and multistep manufacturing processes therefor H01L28/10
• CPC Class Codes: H01F 17/043 with two, usually identical or nearly identical parts enclosing completely the coil (pot cores)
• CPC Class Codes: H01F 2017/046 helical coil made of flat wire, e.g. with smaller extension of wire cross section in the direction of the longitudinal axis
• CPC Class Codes: H01F 27/027 specially adapted for combination of signal type inductors or transformers with electronic circuits, e.g. mounting on printed circuit boards
• CPC Class Codes: H01F 27/38 Auxiliary core members; Auxiliary coils or windings

Abstract

A filtering induction device is provided to improve the filter effect via the increase of an insertion loss resulting from stray capacitance. The induction device includes at least one core structure, and first and second flat coils that interlacing with each other. The first flat coil is used as an inductor, and the second flat coil is used as an electrode belonging to a capacitor formed between the circles of the first flat coil.

Claims

1. A filtering induction device, comprising:

a first flat coil formed by winding a first conductive strip to form a spiral having a plurality of circles, wherein the circles each have a first radius and are arranged layer by layer, wherein the first conductive strip has a first upper surface and a first lower surface, wherein the first conductive strip is covered with an isolation material and the first flat coil is used as an inductor;

a second flat coil formed by winding a second conductive strip to form a spiral having a plurality of circles, wherein the circles each have a second radius and are arranged layer by layer, wherein each of the circles of the second conductive strip is wound between the first upper surface and the first lower surface, to serve as a capacitor; and

a core structure coupled to the first flat coil and the second flat coil.

2. The filtering induction device of claim 1, wherein the core structure is further comprised of:

a core base adapted to contain the first and second flat coils; and

a core cover disposed on the core base.

3. The filtering induction device of claim 2, wherein a sidewall of the core base is provided with at least one opening, via which the first and second flat coils extending out from the core base.

4. The filtering induction device of claim 1, wherein a terminal of the second flat coil is grounded.

5. The filtering induction device of claim 1, wherein the thickness of the first flat coil is substantially equal to the product of the thickness of the first conductive strip times the number of the circles that the first conductive strip is wound.

6. The filtering induction device of claim 1, wherein the thickness of the second flat coil is substantially equal to the product of the thickness of the second conductive strip times the number of the circles that the second conductive strip is wounded.

7. The filtering induction device of claim 1, wherein the first conductive strip is wound such that the first upper surface substantially faces the first lower surface parellelly.

8. The filtering induction device of claim 1, wherein the second conductive strip is wound such that the second upper surface substantially faces the second lower surface parellelly.