Systems and methods for transferring electric power to an aircraft during flight

• US 11,124,314 B2
• Filed: 04/12/2018
• Issued: 09/21/2021
• Est. Priority Date: 04/12/2018
• Status: Active Grant

• Current Assignee: The Boeing Co.
• Original Assignee: The Boeing Co.
• Inventors: Tillotson, Brian J.
• Primary Examiner(s): Xavier, Valentina
• Application Number:
  US15/951,855
• Publication Number:
  US 20190315479A1
• Time in Patent Office: 1,258 Days
• CPC Class Codes: B60L 2200/10 Air crafts
• CPC Class Codes: B60L 2260/32 Auto pilot mode
• CPC Class Codes: B60L 53/16 Connectors, e.g. plugs or sockets, specially adapted for charging electric vehicles
• CPC Class Codes: B60L 53/36 by positioning the vehicle
• CPC Class Codes: B60L 53/37 using optical position determination, e.g. using cameras
• CPC Class Codes: B60L 53/57 Charging stations without connection to power networks
• CPC Class Codes: B64D 2221/00 Electric power distribution systems onboard aircraft
• CPC Class Codes: B64D 39/00 Refuelling during flight filling or emptying fuel tanks B64D37/14
• CPC Class Codes: B64D 41/00 Power installations for auxiliary purposes
• CPC Class Codes: B64U 50/34 In-flight charging photovoltaics B64U50/31
• CPC Class Codes: G01S 19/42 Determining position
• CPC Class Codes: G01S 5/0072 Transmission between mobile stations, e.g. anti-collision systems
• CPC Class Codes: G01S 5/0231 Emergency, distress or locator beacons
• CPC Class Codes: G06T 7/73 using feature-based methods
• CPC Class Codes: G06T 7/97 Determining parameters from multiple pictures depth or shape recovery from multiple images G06T7/55; stereo camera calibration G06T7/85
• CPC Class Codes: H02G 11/02 using take-up reel or drum
• CPC Class Codes: H02J 2310/44 for aircrafts
• CPC Class Codes: H02J 7/0042 characterised by the mechanical construction
• CPC Class Codes: H02J 7/342 The other DC source being a battery actively interacting with the first one, i.e. battery to battery charging with circuits for polarity protection H02J7/0034
• 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

Systems and methods for transferring electric power to an aircraft during flight. Power transfer to the receiver aircraft is effected by means of a donor aircraft using a wired electrical connection. The method for transferring electric power includes: establishing an electrical connection between a receiver aircraft and a donor aircraft during flight; and transferring electric power from the donor aircraft to the receiver aircraft via the electrical connection. In one embodiment, electric power is transferred by way of a power cable deployed by the donor aircraft, a drogue attached to a trailing end of the power cable, and a probe mounted to the fuselage of the receiver aircraft, The probe and drogue are configured to form an electrical connection when fully engaged.

Claims

1. A system for transferring electric power, comprising:

a receiver aircraft comprising a first fuselage and a first coupling device externally mounted to the first fuselage, wherein the first coupling device comprises first and second electrical contacts and first and second electrical conductors respectively connected to the first and second electrical contacts; and

a donor aircraft comprising a second fuselage and a second coupling device positioned aft of the second fuselage, wherein the second coupling device comprises third and fourth electrical contacts and third and fourth electrical conductors respectively connected to the third and fourth electrical contacts,

wherein the first and second electrical contacts are respectively in contact with the third and fourth electrical contacts when the first and second coupling devices are coupled together;

wherein one of the first and second coupling devices has an annular groove and the other of the first and second coupling devices comprises a piston that fits into the annular groove for locking the first and second coupling devices together, a crank connected to the piston, and a motor having an output shaft connected to the crank; and

wherein the piston is displaced radially inward into the annular groove when the motor drives rotation of the crank.

2. The system as recited in claim 1, wherein the second coupling device comprises first and second springs for urging the third and fourth electrical contacts into contact with the first and second electrical contacts.

3. The system as recited in claim 1, wherein the first and second electrical contacts are circular bands made of electrically conductive material.

4. The system as recited in claim 1, wherein the donor aircraft further comprises a power supply and the receiver aircraft further comprises a battery and a battery charger configured to recharge the battery with electric power supplied by the power supply onboard the donor aircraft when the first and second coupling devices are coupled together.

5. The system as recited in claim 1, wherein:

the donor aircraft further comprises a beacon for transmitting a beacon signal and a first computer system configured to encode digital information in the beacon signal; and

the receiver aircraft further comprises a beacon sensor for sensing the beacon signal and a second computer system configured to decode the digital information in the beacon signal.

6. The system as recited in claim 5, wherein the first coupling device further comprises a camera and the second computer system is further configured to receive image data representing an image from the camera and then use an image recognition algorithm to extract feature descriptors and match the extracted features to recognize the image.

7. The system as recited in claim 1, wherein the first coupling device is a probe and the second coupling device is a drogue.

8. The system as recited in claim 7, wherein:

the receiver aircraft further comprises a probe support pipe attached to the first fuselage;

the probe is attached to one end of the probe support pipe; and

the first and second electrical conductors extend from the probe to another end of the probe support pipe.

9. The system as recited in claim 8, wherein:

the donor aircraft further comprises a power cable extending rearward of the second fuselage;

the drogue is attached to one end of the power cable; and

the third and fourth electrical conductors extend from the drogue to another end of the power cable.

10. The system as recited in claim 9, wherein the donor aircraft further comprises a power supply and the receiver aircraft comprises a battery charger that receives electric power from the power supply onboard the donor aircraft via the first through fourth electrical conductors when the first and second electrical contacts of the probe are respectively in contact with the third and fourth electrical contacts of the drogue.

12. The system as recited in claim 1, wherein the receiver aircraft further comprises a battery charger and an electrical connection between the battery charger and the electrical contacts in the coupling device.

13. The system as recited in claim 12, wherein the first coupling device comprises a probe and the electrical contacts comprise circular bands made of electrically conductive material.

14. The system as recited in claim 1, wherein the donor aircraft further comprises a cable spool rotatably coupled to the fuselage, a power supply, and a power transfer unit configured to transfer electric power from the power supply in a power transfer mode, a power cable connected to the cable spool and electrically coupled to the power transfer unit, the second coupling device comprises a drogue attached to the power cable, the power cable comprises electrical conductors, and the drogue comprises the first and second electrical contacts which are electrically coupled to the electrical conductors of the power cable.

17. The system as recited in claim 1, wherein:

the first and second electrical conductors are cups having profiles that are truncated cones; and

the third and fourth electrical conductors are annular bands.

11. A system for transferring electric power, comprising:

a receiver aircraft comprising a first fuselage and a first coupling device externally mounted to the first fuselage, wherein the first coupling device comprises first and second electrical contacts and first and second electrical conductors respectively connected to the first and second electrical contacts; and

a donor aircraft comprising a second fuselage and a second coupling device positioned aft of the second fuselage, wherein the second coupling device comprises third and fourth electrical contacts and third and fourth electrical conductors respectively connected to the third and fourth electrical contacts,

wherein the first and second electrical contacts are respectively in contact with the third and fourth electrical contacts when the first and second coupling devices are coupled together;

wherein the first coupling device comprises a hook, a pivot axle having opposing ends affixed to the hook, and a pivotable latch that is rotatably coupled to the pivot axle and spring-loaded; and

wherein the second coupling device comprises a trapeze bar configured to fit between the hook and the pivotable latch when the pivotable latch is in a closed position.

15. The system as recited in claim 11, wherein the donor aircraft further comprises a power supply, a power transfer unit configured to transfer electric power from the power supply in a power transfer mode, and electrical conductors electrically coupled to the power transfer unit, wherein the trapeze bar comprises the third and fourth electrical contacts which are electrically coupled to the electrical conductors and disposed on an external surface of the trapeze bar.

18. The system as recited in claim 11, wherein:

the pivotable latch comprises sidewalls connected to and projecting in parallel from side edges of a cross wall; and

a lower portion of the hook has two mutually parallel slots formed therein for receiving the sidewalls of the pivotable latch when the pivotable latch is pushed by the trapeze bar from the closed position to an open position.

19. The system as recited in claim 18, wherein the hook comprises upper and lower guides that are configured to guide the hook into lateral alignment with the trapeze bar as the trapeze bar enters the hook.

20. The system as recited in claim 19, further comprising a spring-loaded contact support reed supported by one of the upper and lower guides and comprising a flexible reed made of electrically insulating material and having the first and second electrical contacts made of electrically conductive material formed into bar-shaped strips attached thereto.

21. The system as recited in claim 20, wherein the trapeze bar has a central narrow section having a diameter less than a diameter of adjacent sections of the trapeze bar on opposite sides of the central narrow section, the third and fourth electrical contacts being made of electrically conductive material formed into annular bands attached to the central narrow section.

16. A system for transferring electric power during flight, comprising:

a receiver aircraft comprising a first fuselage, a battery, a battery charger connected to the battery, a rectifier connected to the battery charger, and a first coupling device externally mounted to the first fuselage, wherein the first coupling device comprises first and second electrical contacts and first and second electrical conductors respectively connecting the first and second electrical contacts to the rectifier; and

a donor aircraft comprising a second fuselage, a power supply, a power cable connected to the power supply, and a second coupling device external to and positioned aft of the second fuselage, wherein the second coupling device comprises third and fourth electrical contacts connected to the power supply via the power cable,

wherein the first and second electrical conductors are cups having profiles that are truncated cones;

wherein the third and fourth electrical conductors are annular bands; and

wherein the first and second electrical contacts are respectively in contact with the third and fourth electrical contacts.