Mooring multi-rotor unmanned aerial vehicle power management device and method

Abstract

The invention discloses a power management device and method for a mooring multi-rotor unmanned aerial vehicle, and the power management device serves as a management device for a main power supply and a standby power supply when the mooring multi-rotor unmanned aerial vehicle flies, and comprises a main control unit, a reverse irrigation prevention unit, a reverse electromotive force absorption unit, a charging unit, a main power supply and an airborne lithium battery. The charging unit is used for providing constant-current and constant-voltage charging for the airborne lithium battery through the main power supply; the anti-backflow unit is used for preventing large current from flowing back into the airborne lithium battery when the main power supply outputs the large current; the back electromotive force absorption unit is used for absorbing back electromotive force generated by a motor on an arm of the mooring multi-rotor unmanned aerial vehicle into an airborne lithium battery; the main control unit is used for acquiring voltage, current and temperature data of the airborne lithium battery in real time through an I2C bus; and the state information of the airborne lithium battery, the charging current, the anti-backflow state and the number of times of reverse electromotive force absorption are fed back to the mooring multi-rotor unmanned aerial vehicle ground station through a CAN bus interface.

Description

technical field [0001] The invention relates to the technical field of UAV power management, in particular to a tethered multi-rotor UAV power management device and method. Background technique [0002] The tethered multi-rotor drone is a new type of drone that combines a multi-rotor drone with a tethered integrated cable. The essential difference between it and ordinary multi-rotor drones is that the power supply mode is changed from the onboard lithium battery to the direct power supply on the ground. Stay in the air for a long time due to power limitation. Solving the endurance problem of ordinary multi-rotor UAVs, tethered multi-rotor UAVs are considered to be a major trend in the development of UAVs in the future. [0003] Existing technology has the following problems: [0004] (1) During the flight, since the motor in the UAV arm has fast response, start and stop, and when it suddenly decelerates from a high speed, the change of the instantaneous current of the mot...

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Problems solved by technology

However, when this method acts on a high-power motor, a large back electromotive force will be generated, and the output current will also increase significantly, which will easily cause the diode to burn out

[0005] (2) The power supply used by the tethered multi-rotor UAV is all powered by the ground power supply. At this time, the airborne lithium battery needs to be equipped with an anti-backflow circuit at the output end to prevent the ground power supply from continuously supplying the airborne lithium battery. Charging, sending overcharge and causing danger. The existing anti-backflow circuit is composed of one or several diodes. The output terminal of the ground power supply is connected in series. When there are multiple diodes, they are connected in parallel to the output terminal. Although this method is simple, However, due to the large conduction voltage drop of the diode, when the output current is large, the diode will generate a large loss, that is, it is not suitable for use in a power supply with high current output.

[0006] (3) When the ground power supply equipment fails, the lithium battery in the tethered multi-rotor UAV is used as a backup power supply, and it needs to be kept at the working voltage to work normally. When the lithium battery is lower than the working voltage range, it will not be able to maintain the UAV. normal flight

The easiest way is to monitor the voltage of the onboard lithium battery through the ground station software. When it is lower than the working voltage, for the safety of the drone flight, it is necessary to lower the drone to the ground and replace the lithium battery, but this method is not conducive to long-term operation. flight of time

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