Inductive connectors

• US 3,995,209 A
• Filed: 12/22/1975
• Issued: 11/30/1976
• Est. Priority Date: 01/08/1975
• Status: Expired due to Term

• Current Assignee: Pelcon Limited
• Original Assignee: Pelcon Limited
• Inventors: Weston, John Anthony David
• Primary Examiner(s): Kozma, Thomas J.
• Application Number:
  US05/642,912
• Time in Patent Office: 344 Days
• Field of Search: 336/83, 336/DIG. 2, 336/170, 333/32, 333/22 R, 333/7, 320/2, 323/44 R, 323/60
• US Class Current: 323/355
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H03H 7/40 Automatic matching of load impedance to source impedance
• CPC Class Codes: Y10S 336/02 Separable

Abstract

An inductive connector has two coils which are inductively coupled when the two parts of the connector are "connected." Associated with one of the parts is a third coil which is movable, normally automatically, into inductively coupled relationship with the other coil of that part when the parts are separated. An impedance is connected in circuit with the third coil, whereby impedance matching with a source connected to the aforesaid other coil of that part can be achieved when the parts are separated.

Claims

1. An inductive connector comprising first and second cooperating and separable parts, said parts being movable into a first cooperating position in which electrical energy can be inductively coupled between said parts and being separable from each other to interrupt the flow of electrical energy between said parts, said first part including first and second coils, said second part including a third coil, said first and third coils being constructed and arranged such that when said parts are in said first position, said first and third coils are inductively coupled, said second coil being movable into a position where it is inductively coupled with said first coil when said parts are separated from each other, an impedance connected in electrical circuit with said second coil, and means associated with said second part for moving said second coil out of inductively coupled relationship with said first coil when said parts are moved to said first position.

2. An inductive connector according to claim 1 including means for automatically moving said second coil into a position where it is inductively coupled with said first coil when said parts are separated.

3. An inductive connector according to claim 2 wherein said means for automatically moving is a spring.

4. An inductive connector according to claim 3 including movable plug means, said second coil being carried by said plug means, said spring biasing said plug means, and cooperating stop means on said plug means and on said first part for limiting movement of said plug means in the direction in which said spring biases said plug means to a position in which said first and second coils are inductively coupled when said parts are separated.

5. An inductive connector according to claim 1 including movable plug means, said second coil being carried by said plug means, said means for automatically moving comprising a first magnet carried by said plug and a second magnet carried by said means associated with said second part, said magnets being poled to attract each other and being drawn to each other when said parts are in said first position, whereby when said parts are separated, the attraction between said magnets moves said plug into a position where said first and second coils are inductively coupled.

6. An inductive connector according to claim 5 wherein one of said magnets is an electromagnet.

7. An inductive connector according to claim 5 including cooperating stop means on said plug means and on said first part for limiting movement of said plug means in the direction in which said plug means moves when said parts are separated to a position in which said first and second coils are inductively coupled when said parts are separated.

8. An inductive connector according to claim 1 including a first core of ferromagnetic material, said third coil being wound around at least a part of said first core.

9. An inductive connector according to claim 8 including a second core of ferromagnetic material, said second coil being wound around at least a part of said second core, said second core being movable with said second coil.

10. An inductive connector according to claim 9 including a third core of ferromagnetic material, said first coil being wound around at least a part of said third core.

11. An inductive connector according to claim 10 wherein said cores are pot cores.

12. An inductive connector according to claim 9 wherein said ferromagnetic material is ferrite.

13. An inductive connector according to claim 1 wherein said impedance is a resistor.

14. An inductive connector according to claim 1 wherein each of said coils has a longitudinal axis, said coils being constructed and arranged such that said longitudinal axes of all of said coils coincide when said parts are in said first position.

15. An inductive connector according to claim 14 wherein said second coil is movable to a position in which it is located coaxially within said first coil when said parts are separated.

16. An inductive connector according to claim 14 wherein said second coil is movable to a position where said first coil is located coaxially within said second coil when said parts are separated.

17. An inductive connector according to claim 1 wherein each of said coils has a longitudinal axis, said coils being constructed and arranged such that said longitudinal axes of said first and third coils coincide when said parts are in said first position, said second coil being spaced to one side of said first and third coils with its longitudinal axis parallel to the longitudinal axes of said first and third coils when said parts are in said first position, said second coil being movable into a position where its longitudinal axis coincides with the longitudinal axis of said first coil when said parts are separated.

18. An inductive connector according to claim 15 in which said third coil is located coaxially within said first coil when said parts are in said first position.

19. An inductive connector according to claim 16 wherein said first coil is located coaxially within said third coil when said parts are in said first position.

20. An inductive connector according to claim 1 wherein there are at least two of said first coils, two of said second coils, two of said third coils and two of said impedances, said first and third coils being constructed and arranged such that when said parts are in said first position one of said first coils is inductively coupled with one of said third coils and the other of said first coils is inductively coupled with the other of said third coils, said second coils being movable into positions where, when said parts are separated, one of said second coils is inductively coupled with one of said first coils and the other of said second coils is inductively coupled with the other of said first coils, one of said impedances being connected in electrical circuit with one of said second coils, the other of said impedances being connected in electrical circuit with the other of said second coils, said means associated with said second part being for moving said second coils out of inductively coupled relationship with said first coils when said parts are moved to said first position.