Unmanned aerial vehicle wireless charging system

Abstract

The utility model relates to the technical field of wireless charging, in particular to a wireless charging system for an unmanned aerial vehicle, which comprises a direct-current power supply, an inverter circuit, a coupling mechanism, a rectifying circuit and a battery part, the direct-current power supply provides direct current for the system, and the magnetic coupling mechanism can realize electric energy transmission only through high-frequency exciting current; the coupling mechanism adopts an electromagnetic coupling resonant mode technical mode, a wireless electric energy transmission system based on LCC-S compensation topology is adopted, the left side structure of the wireless electric energy transmission system is a full-bridge inverter circuit, the middle structure of the wireless electric energy transmission system is an LCC-S coupling structure, and the right side structure of the wireless electric energy transmission system is a full-bridge uncontrolled rectifying circuit. In the magnetic coupling resonant wireless power transmission system of the unmanned aerial vehicle, in order to enable the coupling mechanism to resonate, the reactive power is zero, and the power transmission efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of wireless charging, in particular to a wireless charging system for drones. Background Art

[0002] Traditional wired charging methods still have drawbacks such as easy generation of sparks, leakage, easy wear, and possible heating of contacts. The carrier platform will face certain sea wave disturbances during charging, causing dynamic misalignment of the platform and having a certain impact on the safety of the charging system. Points that can be improved include increasing charging efficiency, improving platform stability, and thus reducing charging time.

[0003] In the actual use of the existing technology, when the device adjusts the drone, the coupling position cannot fix the drone. When the drone is wirelessly charged, it is usually supported by the landing gear, and the function of the frame itself is to support and cannot fix and adjust the existing charging position of the drone, resulting in the drone being affected by external collisions or external forces during charging, causing the charging position to be misaligned with the charging module, resulting in poor coupling effect between the drone and the charging module and reduced charging efficiency.

[0004] When charging through cables or lithium batteries, safety issues need to be considered, and the charger requires safety measures such as overheat protection and short - circuit protection, and also requires compliance with corresponding output current and voltage. Solar panels need to pay attention to issues such as the installation position and area of the panels.

[0005] In view of the above - mentioned problems, for this reason, we propose a wireless charging system for drones. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a wireless charging system for drones to solve the problems raised in the above - mentioned background art.

[0007] To achieve the above purpose, the utility model provides the following technical solutions:

[0008] A wireless charging system for drones, comprising:

[0009] A DC power supply, an inverter circuit, a coupling mechanism, a rectifier circuit, and a battery part. The DC power supply provides DC current for the system, and the magnetic coupling mechanism can achieve power transfer only through high - frequency exciting current;

[0010] The coupling mechanism adopts the technical method of electromagnetic coupling resonance, and uses a wireless power transmission system based on the LCC - S compensation topology. The left - hand structure of this wireless power transmission system is a full - bridge inverter circuit, the middle structure is an LCC - S coupling structure, and the right - hand structure is a full - bridge uncontrolled rectifier circuit.

[0011] Preferably, the full - bridge inverter circuit includes a DC power supply DC, a capacitor , P-MOS field effect transistor , , , .

[0012] Preferably, the coupling structure of the LCC-S includes a transmitting end and a receiving end;

[0013] The transmitting end includes a coil inductor , a compensating inductor , a resistor , a compensating capacitor , a resonant capacitor ;

[0014] The receiving end includes a coil self-inductance , a resistor , a compensating capacitor .

[0015] Preferably, one end of the compensating inductor is connected between the P-MOS field effect transistor , , and the other end is connected to the resistor . One end of the resistor is connected to the coil inductor , and the other end is connected to the resonant capacitor . The resonant capacitor is connected between the P-MOS field effect transistor , .

[0016] Preferably, one end of the compensating capacitor is connected between the compensating inductor , the resistor , and the other end is connected to the resonant capacitor .

[0017] Preferably, both ends of the coil self-inductance are respectively connected to the resistor , the compensating capacitor .

[0018] Preferably, the full-bridge uncontrolled rectifier circuit includes bridge rectifier diodes , , , , a capacitor , a resistor .

[0019] Preferably, the resistor is connected between the bridge rectifier diodes , .

[0020] Preferably, the compensation capacitor is connected to the capacitor .

[0021] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0022] In the magnetic coupling resonant wireless power transmission system of the unmanned aerial vehicle of the present utility model, in order to make the coupling mechanism resonate, the reactive power is 0, and the power transmission efficiency is improved.

[0023] The LCC-S type compensation topology provided by the present utility model still has a constant output characteristic of the transmitting coil current when the load and the mutual inductance change, which helps to reduce the complexity of the control circuit and make the system more stable and safe. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of the present utility model;

[0025] Figure 2 is a schematic structural diagram of the wireless power transmission system of the present utility model;

[0026] Figure 3 is a schematic structural diagram of the LCC-S equivalent circuit of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0028] Please refer to Figures 1-3 , a wireless charging system for an unmanned aerial vehicle, comprising:

[0029] a DC power supply, an inverter circuit, a coupling mechanism, a rectifier circuit and a battery part. The DC power supply provides DC current for the system, and the magnetic coupling mechanism can realize power transmission only through a high-frequency exciting current;

[0030] The coupling mechanism adopts an electromagnetic coupling resonance technology method and a wireless power transmission system based on an LCC-S compensation topology. The left structure of the wireless power transmission system is a full-bridge inverter circuit, the middle structure is an LCC-S coupling structure, and the right structure is a full-bridge uncontrolled rectifier circuit.

[0031] The full-bridge inverter circuit includes a DC power supply DC, a capacitor , a P-MOS field effect transistor , , , 。

[0032] The coupling structure of the LCC-S includes a transmitting end and a receiving end;

[0033] The transmitting end includes a coil inductor , a compensating inductor , a resistor , a compensating capacitor , and a resonant capacitor ;

[0034] The receiving end includes a coil self-inductance , a resistor , a compensating capacitor 。

[0035] The full-bridge uncontrolled rectifier circuit includes bridge rectifier diodes , , , , a capacitor , and a resistor 。

[0036] Assume the angular frequency of the inverter operation is ω, and the equivalent impedance of the secondary side can be expressed as:

[0037]

[0038] The secondary side needs to satisfy the resonance condition, and we can get:

[0039]

[0040] The reflected impedance obtained by transforming the impedance of the secondary side to the primary side , when it satisfies the resonance condition formula (3.3), its value can be expressed as:

[0041]

[0042] And the equivalent input impedance of the primary side is expressed as:

[0043]

[0044] According to circuit theory, it is necessary to make the imaginary part of the input impedance equal to zero, that is, to satisfy pure resistance. At this time, the reactive power generated by the system is zero, and the system has the best efficiency. Therefore, it is necessary to satisfy:

[0045]

[0046] Therefore, the resonance conditions of this system can be known.

[0047] Write the KCL equation for the primary circuit, we have:

[0048]

[0049] Based on the resonance conditions of the system, for Figure 1 the loop of, write the KVL equation as:

[0050]

[0051] Combining the above equations to obtain the output current of the system is:

[0052]

[0053] Furthermore, the output voltage of the system is obtained as:

[0054]

[0055] Since the internal resistance of the coil is small, its resistance R L ≪R2, so the above equation can be further simplified as:

[0056]

[0057] In this formula, the expression of the output voltage has nothing to do with the load . When the input voltage is determined, the output voltage can be approximated as a constant value.

[0058] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A wireless charging system for an unmanned aerial vehicle, characterized in that, Including: A DC power supply, an inverter circuit, a coupling mechanism, a rectifier circuit, and a battery section. The DC power supply provides DC current for the system, and the magnetic coupling mechanism can achieve power transfer only through high-frequency exciting current; The coupling mechanism adopts the technical method of electromagnetic coupling resonance, and a wireless power transmission system based on the LCC-S compensation topology is adopted. The left structure of the wireless power transmission system is a full-bridge inverter circuit, the middle structure is an LCC-S coupling structure, and the right structure is a full-bridge uncontrolled rectifier circuit.

2. The wireless charging system for an unmanned aerial vehicle according to claim 1, characterized in that, The full-bridge inverter circuit includes a DC power supply DC and a capacitor C bus , P-MOS field effect transistors VT1, VT2, VT3, and VT4.

3. The wireless charging system for an unmanned aerial vehicle according to claim 1, characterized in that, The LCC-S coupling structure includes a transmitting end and a receiving end; The transmitting end includes a coil inductor L p1 , a compensation inductor L1, a resistor R1, a compensation capacitor C1, and a resonant capacitor C p ; The receiving end includes the self-inductance L of the coil s1 , resistor R2, and compensation capacitor C s .

4. A drone wireless charging system according to claim 3, characterized in that, One end of the compensation inductor L1 is connected between the P-MOS field effect transistors VT1 and VT2, and the other end is connected to the resistor R1. One end of the resistor R1 is connected to the coil inductor L p1 and the other end is connected to the resonant capacitor C p The resonant capacitor C p is connected between the P-MOS field effect transistors VT3 and VT4.

5. The wireless charging system for an unmanned aerial vehicle according to claim 4, characterized in that, One end of the compensation capacitor C1 is connected between the compensation inductor L1 and the resistor R1, and the other end is connected to the resonant capacitor C p .

6. The wireless charging system for an unmanned aerial vehicle according to claim 5, wherein, The self-inductance L of the coil s1 is respectively connected to a resistor R2 and a compensation capacitor C at both ends s .

7. An unmanned aerial vehicle wireless charging system according to claim 6, characterized in that, The full-bridge uncontrolled rectifier circuit includes bridge rectifier diodes VD1, VD2, VD3, VD4, a capacitor C0, and a resistor R3.

8. The wireless charging system for an unmanned aerial vehicle according to claim 7, wherein, The resistor R2 is connected between the bridge rectifier diodes VD1 and VD3.

9. The UAV wireless charging system according to claim 8, characterized in that, The compensation capacitor C s is connected to the capacitor C0.

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