POWERING OF DRONE CARRYING BASE STATION TRANSCEIVER
A drone is described. The drone includes a propulsion system, a base station transceiver, a tether connector, and a power system. The power system has a battery and a chopper circuit. The chopper circuit bleeds excess charge from the battery. The power system is configured to power the propulsion system, and to power the base station transceiver through the chopper circuit. The power system is also configured to receive electrical power, through the tether connector, to charge the battery while the drone is in the air.
1 . A drone, comprising:
a propulsion system;
a base station transceiver;
a tether connector; and
a power system having:
a battery; and
a chopper circuit that bleeds excess charge from the battery; wherein:
the power system is configured to:
power the propulsion system;
power the base station transceiver through the chopper circuit; and
receive electrical power, through a tether connected to the tether connector, while the drone is in the air.
2 . The drone of claim 1 , wherein:
the battery is configured to provide power to the propulsion system in a first voltage domain; and
the chopper circuit is configured to provide power to the base station transceiver in a second voltage domain.
3 . The drone of claim 1 , wherein:
the battery comprises multiple parallel-connected battery cells;
the chopper circuit comprises a set of multiple chopper circuits;
the set of multiple chopper circuits comprises a first chopper circuit connected to a first battery cell of the multiple parallel-connected battery cells, and a second chopper circuit connected to a second battery cell of the multiple parallel-connected battery cells; and
chopper circuits in the set of multiple chopper circuits, including the first chopper circuit and the second chopper circuit, are connected in series.
4 . The drone of claim 3 , wherein:
the battery comprises multiple parallel-connected battery cells; and
the set of multiple chopper circuits balances charge between the multiple parallel-connected battery cells.
5 . The drone of claim 1 , wherein:
the power system is configured to receive the electrical power through the tether, while the drone is in the air, and while the base station transceiver is providing cellular service for user equipment.
6 . The drone of claim 1 , wherein:
the chopper circuit is configured to power the base station transceiver while the power system is receiving electrical power through the tether.
7 . The drone of claim 1 , wherein:
the chopper circuit is configured to power the base station transceiver while the drone is not receiving electrical power through the tether.
8 . The drone of claim 1 , wherein the power system is configured to receive the electrical power, through the tether, over a set of redundant power feeds.
9 . The drone of claim 1 , wherein:
the propulsion system comprises a set of one or more propellers; and
each propeller in the set of one or more propellers is configured to rotate substantially horizontally to a base of the drone.
10 . The drone of claim 1 , wherein:
the base station transceiver comprises an antenna for communicating with user equipment; and
the base station transceiver is configured to transmit data between the user equipment and a communication network by transmitting or receiving the data through the tether.
11 . A communication system, comprising:
a base station transceiver;
a battery having multiple parallel-connected battery cells; and
a charge-balancing circuit coupled to each of the multiple parallel-connected battery cells; wherein:
the battery is configured to provide a first power output in a first voltage domain;
the charge-balancing circuit is configured to provide a second power output in a second voltage domain; and
the base station transceiver is configured to receive electrical power from the second voltage domain.
12 . The communication system of claim 11 , wherein:
the charge-balancing circuit comprises a set of multiple chopper circuits;
the set of multiple chopper circuits comprises a first chopper circuit connected to a first battery cell of the multiple parallel-connected battery cells, and a second chopper circuit connected to a second battery cell of the multiple parallel-connected battery cells; and
chopper circuits in the set of multiple chopper circuits, including the first chopper circuit and the second chopper circuit, are connected in series.
13 . The communication system of claim 11 , further comprising:
receiving electrical power over a set of redundant power feeds; and
charging the battery using the received electrical power, while providing the first power output and the second power output.
14 . The communication system of claim 11 , further comprising:
a propulsion system; and
a housing to which the base station transceiver, the battery, and the propulsion system are mounted; wherein:
the propulsion system is configured to receive the electrical power from the second voltage domain.
15 . A method of powering a drone carrying a base station transceiver, comprising:
receiving electrical power over an air-to-ground power feed;
charging, using the received electrical power, a set of multiple parallel-connected battery cells;
balancing a first charge between the multiple parallel-connected battery cells;
bleeding, from the set of multiple parallel-connected battery cells and through a chopper circuit, a second charge;
powering a propulsion system of the drone in a first voltage domain using at least one of the received electrical power or the first charge; and
powering the base station transceiver in a second voltage domain using the second charge.
16 . The method of claim 15 , wherein the air-to-ground power feed comprises a first air-to-ground power feed, and the method further comprises:
receiving the electrical power in parallel over a set of redundant air-to-ground power feeds including the first air-to-ground power feed.
17 . The method of claim 15 , wherein the balancing of the first charge is performed using a set of series-connected chopper circuits, in which each chopper circuit in the set of series-connected chopper circuits is coupled to a respective battery cell of the set of multiple parallel-connected battery cells.
18 . The method of claim 17 , wherein the charging, the balancing, the bleeding, the powering of the propulsion system, and the powering of the base station transceiver are performed while the drone is in the air.
19 . The method of claim 15 , wherein, at a first time, the propulsion system is powered in the first voltage domain and the base station transceiver is powered in the second voltage domain, while the drone is in the air and receiving the electrical power over the air-to-ground power feed.
20 . The method of claim 19 , wherein, at a second time, the propulsion system is powered in the first voltage domain and the base station transceiver is powered in the second voltage domain, while the drone is in the air and not receiving the electrical power over the air-to-ground power feed.