Electromagnetically shielded inductive charging apparatus

• US 5,457,378 A
• Filed: 04/29/1994
• Issued: 10/10/1995
• Est. Priority Date: 04/29/1994
• Status: Expired due to Term

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: Hughes Aircraft Company (Rtx Corporation)
• Inventors: Woody, George R.
• Primary Examiner(s): Peckman, Kristine L.
• Application Number:
  US08/237,564
• Time in Patent Office: 529 Days
• Field of Search: 320/2, 320/21
• US Class Current: 320/108
• CPC Class Codes: B60L 2270/147 electro magnetic [EMI]
• CPC Class Codes: B60L 53/12 Inductive energy transfer
• CPC Class Codes: B60L 53/34 Plug-like or socket-like devices specially adapted for contactless inductive charging of electric vehicles positioning means for charging devices using inductive energy transfer B60L53/38
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields
• CPC Class Codes: H05K 9/0018 with provisions to reduce aperture leakages in walls, e.g. terminals, connectors, cables
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 90/12 Electric charging stations
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles

Abstract

An electromagnetically shielded inductive charging apparatus for use in charging a battery of an electric vehicle, for example. The inductive charging apparatus comprises an inductive charging coupler and a charge port disposed in the electric vehicle and coupled to the battery of the electric vehicle. The charging coupler comprises a center magnetic core, and a primary winding disposed around the center magnetic core. A charger cable is coupled between the primary winding and an external power source for coupling energy to the charging coupler. A plastic coupler housing is provided that has two mating coupler halves that are configured to provide a handle, and the mating coupler halves enclose the primary winding and the center magnetic core, and secures the charger cable in the handle. A plurality of metallized ribs are disposed in the handle that engage outer shielding braid of the charger cable. A conductive plastic strip is disposed along an exterior portion of the coupler between the handle and the primary winding. The charge port has an opening into which the inductive charging coupler is inserted. A plurality of metallized electromagnetic interference (EMI) fingers protrude into the opening and that press against the conductive plastic strip when the coupler is inserted into the charge port. The engagement of the conductive plastic strip and the EMI fingers provides for complete EMI shielding of the charging apparatus.

Claims

1. An inductive charging apparatus for use in charging a battery of an electric vehicle, said apparatus comprising:

an inductive charging coupler comprising;

a center magnetic core;

a primary winding disposed around the center magnetic core;

a charger cable coupled between the primary winding and an external power source for coupling energy to the charging coupler;

a plastic coupler housing that has two mating coupler halves that are configured to provide a handle, and wherein the mating coupler halves enclose the primary winding and the center magnetic core, and secures the charger cable in the handle;

a plurality of metallized ribs disposed in the handle that engage outer shielding braid of the charger cable;

a conductive plastic strip disposed along an exterior portion of the coupler between the handle and the primary winding;

a charge port disposed in the electric vehicle and coupled to the battery of the electric vehicle, said charge port comprising;

an opening into which the inductive charging coupler may be inserted;

a plurality of metallized electromagnetic interference (EMI) fingers protrude into the opening and that press against the conductive plastic strip when the coupler is inserted into the charge port.

2. The inductive charging apparatus of claim 1 wherein the EMI fingers are comprised of tinned copper.

3. The inductive charging apparatus of claim 1 wherein the center magnetic core is comprised of ferrite.

4. The inductive charging apparatus of claim 1 further comprising a strain relief member surrounding the charger cable at a point where it exits the handle, and that is secured by the two mating coupler halves.