Battery charging arrangement for unmanned aerial vehicle utilizing the electromagnetic field associated with utility power lines to generate power to inductively charge energy supplies

• US 7,714,536 B1
• Filed: 04/05/2007
• Issued: 05/11/2010
• Est. Priority Date: 04/05/2007
• Status: Expired due to Fees

• Current Assignee: The United States of America As Represented By The Secretary of Agriculture
• Original Assignee: the united states of america as represented by the secretary of the navy
• Inventors: Silberg, Eric J., Milgram, Judah H.
• Primary Examiner(s): Tso; Edward
• Assistant Examiner(s): HERNANDEZ, MANUEL J
• Application Number:
  US11/789,128
• Time in Patent Office: 1,132 Days
• Field of Search: 320/108, 244/58, 191/10
• US Class Current: 320/108
• CPC Class Codes: B60L 2200/10 Air crafts
• CPC Class Codes: B60L 2200/20 Vehicles specially adapted for children, e.g. toy vehicles
• CPC Class Codes: B60L 2260/32 Auto pilot mode
• CPC Class Codes: B60L 50/53 in combination with an external power supply, e.g. from overhead contact lines
• CPC Class Codes: B60L 50/90 using propulsion power supplied by specific means not covered by groups B60L50/10 - B60L50/50, e.g. by direct conversion of thermal nuclear energy into electricity
• CPC Class Codes: B60L 53/126 Methods for pairing a vehicle and a charging station, e.g. establishing a one-to-one relation between a wireless power transmitter and a wireless power receiver
• CPC Class Codes: B64C 39/024 of the remote controlled vehicle type, i.e. RPV
• CPC Class Codes: B64U 10/14 with four distinct rotor axes, e.g. quadcopters
• CPC Class Codes: B64U 10/17 Helicopters flying platforms B64U10/13
• CPC Class Codes: B64U 50/19 using electrically powered motors
• CPC Class Codes: B64U 50/34 In-flight charging photovoltaics B64U50/31
• CPC Class Codes: B64U 80/25 for recharging batteries; for refuelling
• 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

A method and apparatus for charging energy supplies in an unmanned aerial vehicle (UAV). The present invention relates to a UAV that comprises an inductive charging device that utilizes the electromagnetic field emanated by overhead/utility power lines, to charge the energy supplies. The UAV also includes a releasable latch for holding power lines to allow for the perching of the UAV on power lines during the charging process. The latch and the inductive charging device may be provided on a single device, a battery augmentation trap (BAT). The UAV may be perched in an upright orientation to allow for takeoff after the charging of energy supplies on the power line.

Claims

1. A method of charging energy supplies in an airborne unmanned aerial vehicle, the method comprising:

providing a battery augmentation trap attached to the unmanned aerial vehicle, the battery augmentation trap comprising;

a releasable latch, and

an inductive charging device for charging the energy supplies,

perching the unmanned aerial vehicle on a utility power line by maneuvering the airborne unmanned aerial vehicle so that the releasable latch of the unmanned aerial vehicle secures the utility power line within the releasable latch after which the utility power line supports the unmanned vehicle; and

charging the energy supplies with the inductive charging device utilizing the electromagnetic field associated with the utility power line to generate power for the energy supplies,

providing a propulsion system having a hollow rotor shaft and one or more horizontal rotors; and

providing a battery augmentation trap mount for mounting the battery augmentation trap above the center of gravity of the vehicle body, wherein the battery augmentation trap mount is attached to a base portion of the unmanned aerial vehicle, and the battery augmentation trap mount is at least partially within the hollow rotor shaft.

2. The method of claim 1, wherein the unmanned aerial vehicle is a vertical launch vehicle, the method further comprising:

opening the releasable latch to release the unmanned aerial vehicle after charging the energy supplies with the inductive charging device; and

launching the unmanned aerial vehicle into an airborne state.

3. The method of claim 2, wherein the unmanned aerial vehicle is a rotorcraft, wherein before the releasable latch is opened, the one or more horizontal rotors are rotated to a launching velocity to produce lift forces on the unmanned aerial vehicle.

5. The method of claim 1, further including detecting the presence and the location of the utility power line.

6. The method of claim 1 further including:

providing one or more sensors for monitoring environmental conditions, the one or more sensors connected to the energy supplies,

wherein the charging of the energy supplies with the inductive charging device is provided either continuously or repeatedly to provide energy for the one or more sensors, the method further comprising;

indefinitely monitoring environmental conditions by leaving the unmanned aerial vehicle perched on the utility power line.

4. A method of charging energy supplies in an airborne unmanned aerial vehicle, the method comprising:

providing a battery augmentation trap attached to the unmanned aerial vehicle, the battery augmentation trap comprising;

a releasable latch, and

an inductive charging device for charging the energy supplies,

perching the unmanned aerial vehicle on a utility power line by maneuvering the airborne unmanned aerial vehicle so that the releasable latch of the unmanned aerial vehicle secures the utility power line within the releasable latch after which the utility power line supports the unmanned vehicle; and

charging the energy supplies with the inductive charging device utilizing the electromagnetic field associated with the utility power line to generate power for the energy supplies,

wherein the unmanned aerial vehicle is a vertical launch rotorcraft vehicle, the method further comprising;

opening the releasable latch to release the unmanned aerial vehicle after charging the energy supplies with the inductive charging device;

launching the unmanned aerial vehicle into an airborne state;

providing a propulsion system having a hollow rotor shaft and one or more horizontal rotors, wherein before the releasable latch is opened, the one or more horizontal rotors are rotated to a launching velocity to produce lift forces on the unmanned aerial vehicle,

wherein in the providing of the battery augmentation trap, the battery augmentation trap is attached to the vehicle body above the one or more horizontal rotors and positioned above the center of gravity of the vehicle and positioned along a vertical axis about which the one or more horizontal rotors rotate, wherein said vertical axis extends through the center of gravity of the vehicle, so that in the step of perching the unmanned aerial vehicle is supported by the latch such that the one or more horizontal rotors are maintained in a substantially horizontal orientation.

7. An unmanned aerial vehicle comprising:

a vehicle body including a vertical reference line and a horizontal reference line, the vehicle body having;

a base portion;

a propulsion system;

a battery augmentation trap, the battery augmentation trap comprising;

an inductive charging device for charging energy supplies; and

a releasable latch for releasably holding a utility power line, the battery augmentation trap attached to the vehicle body above the center of gravity of the vehicle body along a substantially vertical line through the center of gravity, wherein when the releasable latch holds the utility power line, the unmanned aerial vehicle is supported by the latch such that the horizontal reference line of the vehicle body and vertical reference line of the vehicle body are maintained in substantially horizontal and substantial vertical orientations respectively the vehicle body further having;

a battery augmentation trap mount for mounting the battery augmentation trap above the center of gravity of the vehicle body, the battery augmentation trap mount attached to the base portion, wherein the propulsion system includes a hollow rotor shaft and one or more horizontal rotors attached to the rotor shaft, wherein the battery augmentation trap is located above the one or more horizontal rotors, the battery augmentation trap attached to the battery augmentation trap mount, the mount at least partially within the hollow rotor shaft, wherein when the releasable latch holds the utility power line the one or more horizontal rotors are positioned to rotate without contacting the utility power line.

8. An unmanned aerial vehicle comprising:

a vehicle body including a vertical reference line and a horizontal reference line, the vehicle body having;

a propulsion system;

an inductive charging device for charging energy supplies; and

a releasable latch for releasably holding a utility power line, the releasable latch attached to the vehicle body above the center of gravity of the vehicle body along a substantially vertical line through the center of gravity, wherein when the releasable latch holds the utility power line, the unmanned aerial vehicle is supported by the latch such the that horizontal reference line of the vehicle body and vertical reference line of the vehicle body are maintained in substantially horizontal and substantial vertical orientations respectively, wherein the vehicle body includes an upper portion, wherein the inductive charging device is located on the upper portion to maximize the effects of the electromagnetic field emanating from the utility power line, and wherein the unmanned aerial vehicle is a helicopter and the inductive charging device is located on a tail boom portion of the helicopter.

9. The unmanned aerial vehicle of claim 8, wherein the propulsion system includes a hollow rotor shaft and one or more horizontal rotors attached to the rotor shaft, wherein the releasable latch is located above the one or more horizontal rotors, wherein when the releasable latch holds the utility power line the one or more horizontal rotors are positioned to rotate without contacting the utility power line.

10. The unmanned aerial vehicle of claim 8, further including sensing means for detecting the presence and location of utility power lines.

11. An unmanned aerial vehicle comprising:

a vehicle body including a vertical reference line and a horizontal reference line, the vehicle body having;

a vertical launch propulsion system having one or more rotors, wherein in an upright orientation the one or more rotors substantially coincide with the horizontal reference line and are rotatable about the vertical reference line;

an inductive charging device for charging energy supplies;

a releasable latch for releasably holding a utility power line, wherein in the upright orientation the releasable latch is attached to the vehicle body above the one or more rotors and positioned above the center of gravity of the vehicle and positioned along the vertical reference line about which the one or more rotors rotate, wherein the vertical reference line extends through the center of gravity of the vehicle.

12. The unmanned aerial vehicle of claim 11, wherein the vehicle body includes a base portion, the unmanned aerial vehicle further including a latch mount for mounting the releasable latch to the vehicle body, the latch mount attached to the base portion.

13. The unmanned aerial vehicle of claim 12, wherein the vertical launch propulsion system includes a hollow rotor shaft, wherein the one or more rotors are attached to the rotor shaft, the latch mount at least partially within the hollow rotor shaft, wherein when the releasable latch holds the utility power line the one or more horizontal rotors are positioned to rotate without contacting the utility power line.

14. The unmanned aerial vehicle of claim 11, wherein the inductive charging device is located within the releasable latch.

15. The unmanned aerial vehicle of claim 11, wherein the vehicle body includes a helicopter tail boom portion, wherein the inductive charging device is located on the tail boom portion.