Electrical power supply for a stationary vehicle, and on-board induction coil connected to the low-voltage on-board electrical system

• US 20160137073A1
• Filed: 12/23/2015
• Published: 05/19/2016
• Est. Priority Date: 06/25/2013
• Status: Active Grant

• Current Assignee: Bayerische Motoren Werke AG
• Original Assignee: Bayerische Motoren Werke AG
• Inventors: Krammer, Josef
• Granted Patent: US 11,358,482 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B60L 53/12 Inductive energy transfer
• CPC Class Codes: B60L 58/20 having different nominal voltages
• CPC Class Codes: H02J 50/10 using inductive coupling
• 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

Abstract

A system includes a vehicle and an induction unit external to the vehicle. The induction unit includes a primary coil designed as a primary induction coil, and the vehicle includes a low voltage on-board electrical system having a secondary coil designed as a secondary induction coil. An alternating voltage can be induced in at least one part of the low-voltage on-board electrical system by the electromagnetic coupling of the secondary coil to the primary coil, and at least one component of the low-voltage on-board electrical system can be fed with the induced alternating voltage or with direct voltage via a rectifier.

Claims

1. A system comprising:

a vehicle; and

a vehicle-external induction unit, wherein the induction unit comprises a primary coil that is in the form of a primary induction coil,

wherein the vehicle comprises a low-voltage vehicle electrical distribution system comprising a secondary coil that is in the form of a secondary induction coil,

wherein an AC electric voltage is induced in at least part of the low-voltage vehicle electrical distribution system by the electromagnetic coupling of the secondary coil to the primary coil, and

wherein the one of the induced AC voltage and, via a rectifier, a direct voltage is fed to at least one component of the low-voltage vehicle electrical distribution system.

2. The system as claimed in claim 1, wherein

the secondary coil is located in an underfloor region of the vehicle,

the primary coil is embodied close to the floor,

the electromagnetic coupling is produced via an air gap between the primary coil and the secondary coil when the vehicle is at a standstill, and

electric power is transmitted from the induction unit to the vehicle when the electromagnetic coupling is produced.

3. The system as claimed in claim 1, further comprising a tuning capacitor connected in parallel with the secondary coil, wherein the induced AC voltage can be tapped off at said tuning capacitor.

4. The system as claimed in claim 2, further comprising a tuning capacitor connected in parallel with the secondary coil, wherein the induced AC voltage can be tapped off at said tuning capacitor.

5. The system as claimed in claim 1, wherein

the induction unit is supplied electric power from an AC voltage grid, and

a radiofrequency electromagnetic oscillation is set at the primary coil by the induction unit.

6. The system as claimed in claim 2, wherein

the induction unit is supplied electric power from an AC voltage grid, and

a radiofrequency electromagnetic oscillation is set at the primary coil by the induction unit.

7. The system as claimed in claim 3, wherein

the induction unit is supplied electric power from an AC voltage grid, and

a radiofrequency electromagnetic oscillation is set at the primary coil by the induction unit.

8. The system as claimed in claim 1, wherein the at least one component to which the induced AC voltage is fed is a heating element.

9. The system as claimed claim 1, wherein the at least one component to which the induced AC voltage is fed is a transformer comprising a transformer primary coil and comprising a transformer secondary coil,

wherein the transformer primary coil is assigned to the induced AC voltage, and

wherein a rectifier is connected downstream of the transformer secondary coil.

10. The system as claimed claim 2, wherein the at least one component to which the induced AC voltage is fed is a transformer comprising a transformer primary coil and comprising a transformer secondary coil,

wherein the transformer primary coil is assigned to the induced AC voltage, and

wherein a rectifier is connected downstream of the transformer secondary coil.

11. The system as claimed claim 3, wherein the at least one component to which the induced AC voltage is fed is a transformer comprising a transformer primary coil and comprising a transformer secondary coil,

wherein the transformer primary coil is assigned to the induced AC voltage, and

wherein a rectifier is connected downstream of the transformer secondary coil.

12. The system as claimed claim 5, wherein the at least one component to which the induced AC voltage is fed is a transformer comprising a transformer primary coil and comprising a transformer secondary coil,

wherein the transformer primary coil is assigned to the induced AC voltage, and

wherein a rectifier is connected downstream of the transformer secondary coil.

13. The system as claimed in claim 1, wherein the low-voltage vehicle electrical distribution system has a rated voltage level of 12-16 volts.

14. The system as claimed in claim 1, wherein the vehicle further comprises at least one further ancillary coil identical to the secondary coil.

15. The system as claimed in claim 14, wherein the secondary coil and the at least one ancillary coil have a common ferrite core.

16. The system as claimed in claim 14, wherein a voltage regulator is connected downstream of the at least one ancillary coil.

17. The system as claimed in one of the preceding claims,

wherein the vehicle-external induction unit is configured for inductive energy supply to an internal combustion engine vehicle comprising a vehicle electrical distribution system in the case of a single voltage level, and

wherein the vehicle-external induction unit is configured for charging a traction battery of a vehicle with an electrified drive train.