A dynamic wireless power supply platform and power supply method for unmanned aerial vehicles (UAVs)

Abstract

This invention discloses a dynamic wireless power supply platform and power supply method for unmanned aerial vehicles (UAVs). The platform includes at least three transmitting coils covering a charging area. Each transmitting coil is connected to a corresponding inverter via a resonant compensation network, which consists of a resonant inductor and a resonant capacitor connected in parallel. The inverter is connected to a power supply system. Each transmitting coil has the same amplitude and a 180° phase difference. One transmitting coil is a positive excitation mode coil, and the others are negative excitation mode coils. The transmitting coils with different excitation modes generate identical magnetic fields in opposite directions. The magnetic flux lines formed by the activated positive excitation mode coil pass through the secondary UAV receiving coil, while the magnetic flux of the unactivated coil does not pass through the UAV receiving coil. This allows for dynamic charging of UAVs at different angles and positions, extending the UAV's flight time.

Description

Technical Field

[0001] This invention belongs to the field of power wireless power transmission technology, specifically a dynamic wireless power supply platform and power supply method for unmanned aerial vehicles (UAVs). Background Technology

[0002] Unmanned aerial vehicles (UAVs) are unmanned aircraft controlled by radio remote control equipment and their own program control devices. Technically, UAVs can broadly include fixed-wing aircraft, helicopters, and multi-rotor aircraft. Among them, multi-rotor aircraft have a strong demand in the field of outdoor UAV applications due to their advantages such as vertical takeoff and landing capabilities, low cost, simple structure, and stable performance. Currently, the application fields of UAVs are very wide, including military uses, disaster prevention and mitigation, search and rescue, traffic monitoring, resource exploration, forest fire prevention, meteorological observation, and crop yield estimation. Currently, multi-rotor UAVs (electrically powered) mainly use lithium batteries as their power source. This is because lithium batteries are not only simple and convenient to use, but also have mature manufacturing processes, high safety and reliability, and a good energy-to-weight ratio. They also have slow power loss when not in use. However, due to the very high requirements for the size and flexibility of UAVs, the capacity design of lithium batteries is greatly limited. Under high-power conditions, the working time of lithium batteries as a power source is very limited, generally with a flight time of about 25 minutes, which greatly restricts the application and development of UAVs and seriously hinders their development.

[0003] Currently, lithium battery-based drone charging methods mainly include wired and wireless methods. Wired charging includes charging from charging base stations and charging via power transmission lines, while wireless charging mainly includes laser charging and solar charging. Traditional wired charging methods are simple to operate and easy to implement, but they reduce the drone's flexibility and cause wire wear during plugging and unplugging. Compared with traditional charging methods, existing wireless charging methods for drones reduce the number of plugging and unplugging steps and the resulting wire wear, effectively solving the problems of power convenience and safe access. However, they all have certain drawbacks. Laser charging suffers from low charging efficiency, difficulty in accurate aiming, and certain environmental hazards, preventing its widespread application. Solar charging has high regional requirements, generally requiring areas with little rain, and the inherent properties of solar cells—small thickness, poor rigidity, and fragility—make them difficult to adapt to environments with short chord lengths, such as wings. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a dynamic wireless power supply platform and power supply method for drones, which can dynamically charge drones at different angles and positions, thereby extending the drone's flight time.

[0005] To achieve the above objectives, the present invention employs the following technical solution:

[0006] A dynamic wireless power supply platform for unmanned aerial vehicles (UAVs) includes at least three transmitting coils covering a charging area. Each transmitting coil is connected to a corresponding inverter via a resonant compensation network, which consists of a resonant inductor and a resonant capacitor connected in parallel. The inverters are connected to a power supply system. Each transmitting coil has the same amplitude and a 180° phase difference. One transmitting coil is an activated positive excitation mode coil, while the other transmitting coils are inactive negative excitation mode coils. The transmitting coils with different excitation modes generate identical magnetic fields in opposite directions. The magnetic flux lines formed by the activated positive excitation mode coil pass through the secondary UAV receiving coil, while the magnetic flux of the inactive negative excitation mode coils does not pass through the UAV receiving coil.

[0007] Furthermore, the magnetic cores of both the transmitting coil and the UAV receiving coil are ferrite.

[0008] Furthermore, the transmitting coil is a rectangular rounded-corner coil.

[0009] Furthermore, the power supply system is one or a combination of two of the following: a power grid or solar photovoltaic cells.

[0010] A power supply method for a dynamic wireless power supply platform for unmanned aerial vehicles (UAVs) includes the following steps:

[0011] When the transmitting coils are in listening mode, one of the transmitting coils is periodically activated within a user-defined activation time via positive wireless power transfer, while the remaining transmitting coils remain inactive. This is due to the negative excitation current I input to the transmitting coils. fk The coupling mutual inductance M between the negative excitation transmitting coil and the UAV receiving coil k Proportional, when I is detected fk When the current value reaches the current threshold, it indicates that the drone receiver coil is close by, activating the negative excitation transmitter coil to transmit wireless power to the drone.

[0012] Compared with the prior art, the present invention has the following technical effects:

[0013] Multiple transmitting coils are coupled across the charging area. The positive and negative excitation coils, along with the UAV receiving coil, form an effective magnetic flux loop conductor. The out-of-phase current configuration in the positive and negative excitation coils enhances the magnetic flux through the UAV receiving coil. The current I input from the negative excitation transmitting coil is utilized... fk The coupling mutual inductance M between the negative excitation transmitting coil and the UAV receiving coil kThe relationship is directly proportional; when the drone receiver coil is close to one of the negative excitation transmitter coils, the input current I of the negative excitation transmitter coil increases. fk The current increases until it reaches the set current threshold. At this point, the negative excitation transmitting coil is selected and activated through an automatic start-up procedure. It then delivers electrical energy to the drone in an electro-magnetic-electrical form. No receiving coil is required to detect the drone's position. This enables highly flexible dynamic charging of drones at different angles and positions, extending the drone's flight time. Attached Figure Description

[0014] Figure 1 : A schematic diagram of the coupling coil mechanism of the wireless power supply platform of the present invention;

[0015] Figure 2 : A schematic diagram of the circuit structure of the wireless power supply platform and the drone receiver of the present invention; Detailed Implementation

[0016] The specific content of the present invention will be further explained in detail below with reference to the embodiments.

[0017] like Figure 1 and Figure 2 As shown, a dynamic wireless power supply platform for drones includes multiple transmitting coils covering a charging area. Each transmitting coil is connected to a corresponding inverter via a resonant compensation network, which consists of a resonant inductor and a resonant capacitor connected in parallel. The inverters are connected to a power supply system, which is either a power grid or a combination of two types of solar photovoltaic cells. Each transmitting coil has the same amplitude and a 180° phase difference. One transmitting coil is an activated positive excitation mode coil, while the others are negative excitation mode coils. The transmitting coils Tx of different excitation modes generate equal and opposite magnetic fields, causing the magnetic flux lines formed by the positive excitation mode transmitting coil Tx to pass through the secondary drone receiving coil Rx. The magnetic flux of the inactive negative excitation mode transmitting coil Tx does not pass through the drone receiving coil Rx. Different transmitting coils Tx can be activated according to the position of the drone receiving coil Rx, thereby enabling wireless power transmission to drones at different angles and positions.

[0018] Multiple transmitter coils Tx are placed in the same transmitter disk area to form a large-area wireless power transmission transmitter superimposed coupling coil area. The transmitter coils Tx are efficiently excited to achieve efficient wireless power transmission to the drone receiver coil Rx in the charging area. This allows for efficient and robust free detection of the position of the drone receiver coil Rx in a large area and wireless power transmission to the drone.

[0019] Preferably, the magnetic cores of both the transmitting coil and the UAV receiving coil are ferrite, which can increase the magnetic field strength between the coupled coils, thereby improving the wireless power transmission capability.

[0020] Preferably, the transmitting coil is a rectangular rounded corner coil.

[0021] A power supply method for a dynamic wireless power supply platform for unmanned aerial vehicles (UAVs) includes the following steps:

[0022] When the transmitter coils Tx are in listening mode, one of the transmitter coils Tx is periodically activated for short periods of time via positive wireless power transfer (the period refers to one charging cycle of the positive excitation coil and the UAV receiver coil), while the remaining transmitter coils Tx remain inactive. This is due to the negative excitation transmitter coils receiving a current I. fk The coupling mutual inductance M between the negative excitation transmitting coil Tx and the UAV receiving coil Rx k Proportional, when I is detected fk When the current value reaches the set current threshold, it means that the drone receiver coil Rx is close, which activates the negative excitation transmitter coil Tx to transmit wireless power to the drone.

[0023] Specifically, when the drone receiver coil Rx moves within the wireless power supply area, the activation mode of the transmitter coil Tx is updated to track the drone receiver coil Rx. The transmitter coil Tx, in listen mode, is ready to respond to the drone receiver coil Rx's movement. All other transmitter coils Tx in the transmitter disk area will remain in listen mode. When the transmitter coil Tx is in negative excitation mode, the input current I... fk When the set current threshold is reached, the negative excitation mode transmitter coil Tx will be activated to positive excitation mode. At any time, when the UAV receiver coil Rx moves to a specific negative excitation mode transmitter coil Tx, that negative excitation mode transmitter coil Tx will be activated.

[0024] By utilizing the induction effect of the UAV receiver coil Rx on its adjacent negative excitation transmitter coil Tx, firstly, the transmitter coil Tx can effectively identify the position of the UAV receiver coil Rx, and secondly, it can activate the negative excitation transmitter coil Tx. Thus, based on the position of the UAV receiver coil, wireless power transmission can be achieved for UAVs at different angles and positions.

Claims

1. A dynamic wireless power supply platform for unmanned aerial vehicles (UAVs), characterized in that, The device includes at least three transmitting coils covering the charging area. Each transmitting coil is connected to a corresponding inverter via a resonant compensation network, which consists of a resonant inductor and a resonant capacitor connected in parallel. The inverter is connected to the power supply system. Each transmitting coil has the same amplitude and a 180° phase difference. One transmitting coil is an activated positive excitation mode coil, while the other transmitting coils are inactive negative excitation mode coils. The transmitting coils of different excitation modes generate the same magnetic field in opposite directions. The magnetic flux line formed by the activated positive excitation mode coil passes through the secondary UAV receiving coil, while the magnetic flux of the inactive negative excitation mode coil does not pass through the UAV receiving coil.

2. The dynamic wireless power supply platform for UAVs according to claim 1, characterized in that, The magnetic cores of both the transmitting coil and the UAV receiving coil are ferrite.

3. The dynamic wireless power supply platform for UAVs according to claim 1 or 2, characterized in that, The transmitting coil is a rectangular rounded-corner coil.

4. The dynamic wireless power supply platform for UAVs according to claim 1 or 2, characterized in that, The power supply system is one or a combination of the power grid or solar photovoltaic cells.

5. A power supply method for a dynamic wireless power supply platform for an unmanned aerial vehicle as described in claim 1, characterized in that, Includes the following steps: When the transmitting coils are in listening mode, one of the transmitting coils is periodically activated within a user-defined activation time via positive wireless power transfer, while the remaining transmitting coils remain inactive. This is due to the negative excitation current I input to the transmitting coils. fk The coupling mutual inductance M between the negative excitation transmitting coil and the UAV receiving coil k Proportional, when I is detected fk When the current value reaches the current threshold, it means that the drone receiver coil is close, activating the negative excitation transmitter coil to transmit wireless power to the drone.

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