Sectional ferrite core construction for mechanical stress relief in inductive charging systems

• US 5,640,135 A
• Filed: 04/29/1994
• Issued: 06/17/1997
• Est. Priority Date: 04/29/1994
• Status: Expired due to Term

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: Delco Electronics Corporation (Motors Liquidation Co. GUC Trust)
• Inventors: Woody, George, Tanzer, Herbert J., Hall, John T.
• Primary Examiner(s): Kozma, Thomas J.
• Application Number:
  US08/238,069
• Time in Patent Office: 1,145 Days
• Field of Search: 336/233, 336/234, 336/212, 336/200, 336/83, 336/DIG. 2, 336/119, 336/210
• US Class Current: 336/212
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: Y10S 336/02 Separable

Abstract

An inductive charging coupler for use in an inductive charging system that minimizes damage thereto caused by shock. The charging coupler comprises a housing, and a magnetic core disposed in the housing that is comprised of a plurality of sections. A primary winding is disposed around the magnetic core, A current conductor is coupled to the primary winding for coupling current thereto. By employing smaller sections of ferrite material to form the magnetic core, there is less potential for encountering broad differences in the crystal structure of the ferrite material. These structural differences can cause the ferrite material to be more prone to crack or shatter under stress conditions, such as if the coupler is dropped during use. Also smaller ferrite pieces are lighter than a single piece of ferrite material, which causes lower distributed loads due to a shock. In addition, smaller ferrite pieces allow more surface area contact with housing components or adhesives used to secure the core in the coupler and help dampen shock loads.

Claims

1. An inductive charging coupler for use in an inductive charging system that minimizes damage thereto caused by shock, said charging coupler comprising:

a housing;

a ferrite puck disposed in the housing and having a thickness dimension along an axis that coincides with a desired direction of magnetic flux through said puck, said puck being divided into a plurality of sections along;

said thickness dimension, adjacent sections of said puck being secured to one another with adhesive so as to distribute loads experienced by the puck due to shock, thereby minimizing damage to the coupler from such shock;

a primary winding disposed around the ferrite puck; and

means for coupling current to the primary winding.