KR101884414B1 - Wireless Power Transmission Apparatus for Drone - Google Patents

Abstract

The present invention relates to a wireless power transmission apparatus for a drone, capable of sufficiently extending an operating time of the drone. The wireless power transmission apparatus for the drone includes: an AC-DC power supply device (31); first and second half bridge switches (41, 42); a transformer (70); a primary side resonant capacitor (48); a secondary side resonance capacitor (49); a full bridge type rectifying unit (60); a lithium-ion battery (11); a first comparator (115); a second comparator (116); a third comparator (117); a fourth comparator (118); a first AND gate (113); a second AND gate (114); a first RS flip-flop (111); and a second RS flip-flop (112), wherein the first and second half bridge switches (41, 42) are controlled based on an AC voltage of the primary side resonant capacitor (48) located on a primary side of the transformer (70).

Description

Technical Field [0001] The present invention relates to a wireless power transmission apparatus for a drone,

The present invention relates to a wireless power transmission apparatus for transmitting wireless power for wireless charging of a drone. Generally, the way to charge the drones is to replace the batteries located underneath the drones with new batteries, and it can be cumbersome to replace the batteries when operating the drones. Accordingly, the present invention is directed to a wireless power transmission apparatus for wireless charging of a dron that is capable of charging the dron wirelessly to conveniently solve the complexity of charging that may occur in operating the drones.

In recent years, there has been an increasing interest in wireless charging methods that do not require an inconvenient process of connecting wires to charge portable electronic products, and a wireless charging method of self induction and resonance coupling As the standard begins to emerge, the practical use of wireless charging is proceeding rapidly.

Such a wireless charging scheme is an energy transfer concept that transfers energy from a charging method of an electronic device through a conventional wire to wirelessly using the principle of electromagnetic induction or resonance coupling, Transmission methods have been studied.

Resonance coupling is studied to be able to transmit electric power even at distances of about several meters [m] compared to the self induction method for the distance and position between transceivers. Accordingly, the following prior arts exist for the development of a wireless power transmission device that provides both a wireless charging function and a short-range wireless communication function.

As a related prior art, Korean Patent Laid-Open Publication No. 10-2012-0047027, published May 21, 2012 (hereinafter referred to as "Patent Document 1") discloses a wireless power transmission method and apparatus. Patent Document 1 includes a control unit for controlling the resonance power generation unit and the inductive power generation unit so that power is generated in at least one of the resonance power generation unit and the inductive power generation unit that generates the resonance power at the specific (specific) As a technical feature.

Another prior art is disclosed in Korean Patent Laid-open Publication No. 10-2017-0043393, Publication Date 2014.04.21 (hereinafter referred to as Patent Document 2), which discloses a coil device, a method of manufacturing a coil device, A power transmission device, and a wireless power receiving device. Patent Document 2 discloses a wireless power transmission device or a wireless device including a coil device and a coil device in which one side is commonly connected to a first terminal and the other side is commonly connected to a second terminal, A power receiving device, and the coil device.

In addition, Korean Patent Laid-open Publication No. 10-2013-0068645, published on June 26, 2013 (hereinafter referred to as "Patent Document 3") discloses a wireless power transmission system. In the above-described Patent Document 3, the radio power transmission system using self-resonance includes a moving means, a moving means holder capable of holding the moving means, and a transmission induction coil supplied with power from a power source, The present invention is directed to a wireless power transmission system capable of charging even during storage of the means, thereby enhancing the user's convenience.

However, in the above-described Patent Documents 1 to 3, a general wireless power transmission system has been proposed, but there has been a limitation in proposing a wireless power transmission apparatus suitable for a drone.

[Patent Document 1] Korean Published Patent Application No. 10-2012-0047027, Disclosure Date 2012.05.11. [Patent Document 2] Korean Patent Laid-Open Publication No. 10-2017-0043393, Publication Date 2017.04.21. [Patent Document 3] Korean Patent Laid-Open Publication No. 10-2013-0068645, publication date 2013.06.26.

In the conventional drone, there is a problem that the convenience of charging is very low. The problem of the existing drone is that the operation time of the drone is relatively short within one hour due to the limit of the electric energy supplied from the battery. In particular, in the case of a training drone used in a university or the like, the drone can not be operated for 1 hour during the training time. In general, the battery is supplied for 10 to 20 minutes. In many cases.

In order to fundamentally solve the charging problem of the drone of the present invention, a method of wirelessly charging a battery of a drone is proposed, and the operating time of the drone is increased to 1 hour or more, It is possible to sufficiently operate the drone for one hour without replacing the battery.

In order to solve the above-mentioned problem, the present invention is characterized in that first, a power transmitting coil (Tx coil) and a power receiving coil (Rx coil) are arranged to supply electric power to a drone, A Tx coil for two drones, a coil 200 having a small size of a power transmission coil (Tx coil) and a coil 250 having a large size, has been proposed according to a position. Third, Bridge resonant LLC half-bridge converter and a resonant LLC full-bridge converter for power transmission while resonating the power from the Tx coil to the Rx coil. And a converter control unit for optimally controlling the resonant LLC half-bridge converter and the resonant LLC full-bridge converter is a solution to the problem of the present invention.

The present invention has the following elevated effects. First, it can overcome the limitation of the electric energy supplied from the battery, which is a problem of the existing drone, and can sufficiently extend the operating time of the drone. Secondly, The drones can be smoothly educated because the power is supplied to the drones through the wireless power transmission. Third, the power of the drones can be transmitted through the wireless power transmission, There is an effect.

Figure 1 shows the details of the drones
FIG. 2 is a cross-
FIG. 3 is a schematic view showing a single-shaft drones experimental apparatus
Fig. 4 shows a concept of three-axis movement of pitch, roll, and yaw
FIG. 5 is a cross-
FIG. 6 is a cross-sectional view of a triaxial drones experimental apparatus
Figure 7 shows a three-axis drones arrangement phase diagram
Figure 8 is a diagram of the arrangement phase of a triaxial drones for wireless power transmission of a drones
9 is a detailed structural view of a transformer for wireless power
10 shows a three-axis drones experimental device for wireless power transmission
11 shows a three-axis drones experimental device for wide scope wireless power transmission
12 is a schematic diagram of a proposed resonant LLC half bridge-
FIG. 13 is a block diagram of the proposed resonant LLC full bridge type wireless charging circuit
Fig. 14 shows the waveforms of the main waveforms of the proposed wireless charging circuit
15 is a schematic diagram of a proposed resonant LLC half-bridge type wireless power transmission device
16 is a schematic diagram of a proposed resonant LLC half-bridge wide scope wireless power transmission apparatus
17 is a block diagram of a proposed resonant LLC full bridge type wireless power transmission device
18 is a schematic diagram of a proposed resonant LLC full bridge type wide scope wireless power transmission apparatus
19 is a detailed circuit diagram of the proposed resonant LLC half-bridge type wireless power transmission apparatus
20 is a detailed circuit diagram of the proposed resonant LLC full bridge type wireless power transmission device

The present invention will now be described in detail with reference to the accompanying drawings.

Fig. 1 shows a detailed configuration diagram of the drones.

The drone technology of drone has developed considerably and recently it has been widely used in various fields of society such as video shooting, fire detection, fire prevention, spraying of pesticide, and pizza delivery. However, one of the biggest problems of the drones is that when the lithium-ion battery is discharged during the flight, the battery is removed after the landing of the drones and the lower case of the drones, The battery must be replaced repeatedly from time to time.

The general structure of the general drones 10 is as follows.

1, the dron 10 includes (1) a lithium-ion battery 11, (2) a frame 12, (3) a communication module (receiver) 13, (4) a flight controller 14 5) a transmission (ESD) 15, and 6) a propeller 20 connected to the motor. The drones 10 are largely constructed by combining the above-mentioned (1) to (6).

A lithium ion battery 11 for supplying power to the dron 10 to a frame 12 as a body of the dron 10, a communication module 13 for receiving a radio signal transmitted from a transmitter and converting the received radio signal into a control signal, And a flight controller 14 for automatically controlling the movement of the drones 10, four transmissions 15, and four propellers 20.

Fig. 2 shows a uniaxial drones experimental apparatus.

In the uniaxial drones experimental apparatus (FIG. 2), the central axis is fixed and the frame 12 of the drone 10 is moved upward / downward to control the posture as PID (proportional-integral-derivative) control It is possible to structure. A total of two motors 25 and one propeller 20 are disposed at one end and one end at the other end of the frame 12, Two transmissions 15 are located. The transmission is a mechanical device for changing the speed required in the drone 10 and communicates through a communication module (receiver) 13 of the drone 10, The speed of the propeller 20 is controlled by the control unit 14.

Fig. 3 shows a uniaxial drones experimental apparatus equipped with a safety mechanism.

In the uniaxial drones experimental apparatus (FIG. 3) equipped with the safety mechanism, the uniaxial drones 81 are disposed inside the safety device 80 for safety in the education of the user of the drones 10.

Thus, it is a technical feature that an accident of the drone driver due to a malfunction of the drone 10 during education can be prevented in advance.

Fig. 4 shows the concept of three-axis movement of pitch, roll, and yaw.

The pitch refers to the movement of the head part of the flying body (drone or the like) in the upward or downward direction in the direction in which the flying body (drone or the like) moves, and the roll is the flying body (Drone or the like) moving in the direction of movement of the airplane (drone or the like) means upward or downward movement of the wing portion of the airplane (drone or the like) Left " or " right " movement.

5 shows a triaxial drones experimental apparatus.

In the triaxial drones experimental apparatus (FIG. 5), the drones are movable in three axes of pitch, roll, and yaw as shown in FIG. In comparison with the uniaxial drones experimental apparatus of FIG. 3, the drones 10 are more freely movable and controlled by the four motors 25 and the four propellers 20.

6 shows a triaxial drones experimental apparatus equipped with a safety mechanism.

In the triaxial drones experimental apparatus (FIG. 6) equipped with the safety mechanism, the safety mechanism 80 is installed in the triaxial drones 83 capable of moving in three directions of pitch, roll and yaw. Respectively. In FIG. 5 (a), the dron is mounted in the safety device 80, and in FIG. 5 (b), the safety device door 84 is opened after the safety device 80 is installed.

In case of flying test, strong wind is generated by the propeller, so that the wind can easily escape to the upper, lower, left and right sides, thereby eliminating obstacles to the flight of the drone (10) (Integral-differentiation) control, information of the sensor can be confirmed through the monitor 82, and the present value of the PID and the changed value when the PID value is adjusted, sensor data is displayed on the monitor 82.

7 shows a three-axis drones arrangement step configuration diagram.

7 (a), the first holding base 85 of the drones is disposed in the safety mechanism 80, and the one-touch base 93 as shown in FIG. 7 (b) And thereafter, there is a disposing step of arranging the triaxial drones 83 as shown in Fig. 7 (c).

8 shows a layout diagram of a three-axis drones for wireless power transmission of a drones.

8 (a) shows the arrangement of the three-axis drones for the wireless power transmission of the drones, Fig. 8 (a) (RX coil) 300 is disposed above the one-touch base 93, and FIG. 8 (c) is a view showing a state where the receiver coil (RX coil) And a triaxial drones 83 to be supplied with power from the power source 300 are arranged.

9 shows a detailed structure of a transformer for wireless power.

9 (a) shows a receiving coil (RX coil) 300, and FIG. 9 (b) shows a transformer having a first transmitting coil (Tx coil) 200 9C shows a wireless power transmission and reception coil 350 which is a first Tx coil 200 having the same size as the RX coil 300, 9 (d) shows a second transmission coil (Tx coil) 250 having a relatively large size as compared with the receiving coil (RX coil) 300.

10 shows a triaxial drones experimental device for wireless power transmission.

Figure 10 shows a triaxial drones 83 experimental device for wireless power transmission mounted on a safety device 80 in which a first Tx coil 200 is disposed within the safety device 80 And a first stand 86 of the drone is disposed. Further, a receiver coil (RX coil) 300 is disposed on the upper side (upper side) of the one-touch base 94. And a triaxial drones 83 receiving power from the receiving coil (RX coil) 300.

The monitor 82 displays the current PID value and the changed value at the time of adjusting the PID value, the speed of each motor 25, the data of the transmission (ESD) 15, And a charging state indicator 87 indicating charging state by separating red, yellow and green according to the charged state of the drones 83. When the charged state is less than 20% ] Yellow, and in case of exceeding 80 [%], it is displayed as green color.

11 shows a triaxial drones experimental apparatus for wide scope wireless power transmission.

In the triaxial drones experimental apparatus (FIG. 11) for the wide-range wireless power transmission, a second holder 88 of a dron where a second transmitter coil (Tx coil) is disposed is disposed. Further, a receiver coil (RX coil) 300 is disposed on the upper side (upper side) of the one-touch base 94. The second transmission coil (Tx coil) 250 is relatively larger than the first transmission coil (Tx coil) 200. Further, a receiving coil (RX coil) 300 is disposed on the upper side of the one-touch base 94, and a triaxial drones 83 receiving power from the receiving coil (RX coil) .

The monitor 82 displays the current PID value and the changed value at the time of adjusting the PID value, the speed of each motor 25, the data of the transmission (ESD) 15, And a charging state indicator 87 indicating charging state by separating red, yellow and green according to the charged state of the drones 83. When the charged state is less than 20% ] Yellow, and in case of exceeding 80 [%], it is displayed as green color.

12 shows a proposed resonant LLC half bridge type wireless charging circuit.

The proposed resonant-type LLC half-bridge-type charging circuit has a stable zero voltage switching (ZVS) due to the resonance of leakage inductor (Llk) - magnetizing inductor (Lm) - resonant capacitor (Cs) .

The proposed LLC half bridge type wireless charging circuit supplies DC power from an AC-DC power supply 31 from an AC power supply 30, and supplies power to the first and second half bridge switches 41 and 42 Between the contact of the first half bridge switch 41 and the second half bridge switch 42 and the source of the second half bridge switch 42 in the half bridge switch 40 connected in series, The first and second half bridge switches 41 and 42 are connected through the LLC resonance of the first leakage inductor 45 of the transformer and the magnetizing inductor 47 of the transformer to the primary resonance capacitor 48 of the transformer 70, (ZVS) is performed.

In addition, on the secondary side of the transformer, power is transmitted through resonance on both the primary side and the secondary side of the transformer through the resonance of the second leakage inductor 46 and the secondary side resonance capacitor 49 of the transformer, The resonance power is characterized in that the lithium-ion battery 11 is charged with electric power through the full-bridge type rectifying unit 60.

13 shows a proposed resonant LLC full bridge type wireless charging circuit.

The proposed resonant LLC full bridge type wireless charging circuit is designed to provide stable zero voltage switching (ZVS) due to resonance of leakage inductor (Llk) - magnetizing inductor (Lm) - resonant capacitor (Cs) .

The proposed LLC full bridge type wireless charging circuit supplies DC power from an AC-DC power supply (31) from an AC power supply (30), and the first to fourth pools Bridge switches 51 to 54 are connected in a bridge structure so that the contacts of the first full bridge switch 51 and the third full bridge switch 53 and the contacts of the second full bridge switch 52 and A real transformer 70 is disposed between the contacts of the fourth full bridge switch 54. The first to fourth full-bridge switches 51 to 54 are turned on through the LLC resonance of the first leakage inductor 45, the magnetizing inductor 47 and the primary resonance capacitor 48 of the transformer 70, (ZVS).

In addition, on the secondary side of the transformer, power is transmitted through resonance on both the primary side and the secondary side of the transformer through the resonance of the second leakage inductor 46 and the secondary side resonance capacitor 49 of the transformer, The resonance power is characterized in that the lithium-ion battery 11 is charged with electric power through the full-bridge type rectifying unit 60.

Figure 14 shows the main waveform of the proposed wireless charging circuit.

14 (a) shows a transformer primary side current Ip and a transformer primary side magnetizing current Im waveform. Fig. 14 (b) shows a current Is2 waveform of the lower switch. Fig. 14D shows the waveform of the voltage Vs2 of the lower switch, Fig. 14E shows the waveform of the upper switch gate signal Vg1, Fig. 14F shows the waveform of the upper switch gate signal Vg1, And a gate signal (Vg2) waveform. Since the proposed wireless charging circuit performs the LLC resonance in both the first and second transformers, it can be seen that the primary side current Ip of the transformer is resonated to a sinusoidal wave in FIG. 14 (a) 14 (b), current flows through the antiparallel diode of each switch because the current flows to (-) when the switch is turned on. When the switch is turned on, the voltage at both ends becomes zero Therefore, zero voltage switching (ZVS) is required. 14 (c), resonance occurs also at the secondary side of the transformer, so that it can be confirmed that the waveform of the rectified diode current Id of the resonance current resonates with a sinusoidal wave.

15 shows a proposed resonant LLC half-bridge type wireless power transmission apparatus.

The proposed resonant LLC half-bridge type wireless power transmission apparatus (Fig. 15) stably supplies zero voltage switching [ZVS (Zero)] due to resonance of leakage inductor Llk- magnetizing inductor Lm- resonance capacitor Cs in the transformer. -Voltage-Switching)] is performed.

The proposed LLC half bridge type wireless charging circuit supplies DC power from an AC-DC power supply 31 from an AC power supply 30, and supplies power to the first and second half bridge switches 41 and 42 Between the contact of the first half bridge switch 41 and the second half bridge switch 42 and the source of the second half bridge switch 42 in the half bridge switch 40 connected in series, The first and second half bridge switches 41 and 42 are connected through the LLC resonance of the first leakage inductor 45 of the transformer and the magnetizing inductor 47 of the transformer to the primary resonance capacitor 48 of the transformer 70, (ZVS) is performed.

In addition, on the secondary side of the transformer, power is transmitted through resonance on both the primary side and the secondary side of the transformer through the resonance of the second leakage inductor 46 and the secondary side resonance capacitor 49 of the transformer, The resonance power is characterized in that the lithium-ion battery 11 is charged with electric power through the full-bridge type rectifying unit 60.

A Tx coil 200 having a size identical to (identical to) the RX coil 300 is disposed.

In the resonant LLC half-bridge type wireless power transmission apparatus, the switching frequency is a wireless characteristic of resonance coupling in which switching is performed at a high frequency of several [MHz] to several tens [MHz]. The resonant LLC half bridge type wireless power transmission apparatus is characterized in that the resonance frequency of the first transmission coil 200 and the reception coil 300 are switched so that the resonant frequencies of the Tx coil 200 and the RX coil 300 coincide with each other do.

The resonance power transmitted from the first Tx coil 200 to the RX coil 300 is transmitted to the lithium-ion battery 11 through the full-bridge type rectifier 60 And the electric power charged in the lithium-ion battery 11 is used to drive the motor of the drone 10.

16 shows a proposed resonant LLC half-bridge wide scope wireless power transmission device. The proposed resonant LLC half-bridge wide scope wireless power transmission apparatus (Fig. 16) can stably supply zero voltage (Fig. 16) due to the resonance of the leakage inductor Llk - magnetizing inductor Lm - resonant capacitor Cs in the transformer. ZVS (Zero-Voltage-Switching)] is performed.

The proposed LLC half bridge type wireless charging circuit supplies DC power from an AC-DC power supply 31 from an AC power supply 30, and supplies power to the first and second half bridge switches 41 and 42 Between the contact of the first half bridge switch 41 and the second half bridge switch 42 and the source of the second half bridge switch 42 in the half bridge switch 40 connected in series, The first and second half bridge switches 41 and 42 are connected through the LLC resonance of the first leakage inductor 45 of the transformer and the magnetizing inductor 47 of the transformer to the primary resonance capacitor 48 of the transformer 70, (ZVS) is performed.

In addition, on the secondary side of the transformer, power is transmitted through resonance on both the primary side and the secondary side of the transformer through the resonance of the second leakage inductor 46 and the secondary side resonance capacitor 49 of the transformer, The resonance power is characterized in that the lithium-ion battery 11 is charged with electric power through the full-bridge type rectifying unit 60.

A Tx coil 250 having a relatively larger size than the RX coil 300 is disposed.

In the resonant LLC half-bridge type wireless power transmission apparatus, the switching frequency includes a wireless charging of self induction and resonance coupling, which performs switching from a frequency of several hundreds of kHz to several tens of MHz, . The resonant LLC half bridge type wireless power transmission apparatus is characterized in that the resonance frequency of the second transmission coil (Tx coil) 250 and the reception coil (RX coil) 300 are matched with each other do.

The resonance power transmitted from the second Tx coil 250 to the RX coil 300 is transmitted to the lithium-ion battery 11 through the full-bridge type rectifier 60 And the electric power charged in the lithium-ion battery 11 is used to drive the motor of the drone 10.

17 shows a proposed resonant LLC full bridge type wireless power transmission apparatus.

The proposed resonant LLC full bridge type wireless charging circuit is designed to provide stable zero voltage switching (ZVS) due to resonance of leakage inductor (Llk) - magnetizing inductor (Lm) - resonant capacitor (Cs) .

The proposed LLC full bridge type wireless charging circuit supplies DC power from an AC-DC power supply (31) from an AC power supply (30), and the first to fourth pools Bridge switches 51 to 54 are connected in a bridge structure so that the contacts of the first full bridge switch 51 and the third full bridge switch 53 and the contacts of the second full bridge switch 52 and A real transformer 70 is disposed between the contacts of the fourth full bridge switch 54. The first to fourth full-bridge switches 51 to 54 are turned on through the LLC resonance of the first leakage inductor 45, the magnetizing inductor 47 and the primary resonance capacitor 48 of the transformer 70, (ZVS).

In addition, on the secondary side of the transformer, power is transmitted through resonance on both the primary side and the secondary side of the transformer through the resonance of the second leakage inductor 46 and the secondary side resonance capacitor 49 of the transformer, The resonance power is characterized in that the lithium-ion battery 11 is charged with electric power through the full-bridge type rectifying unit 60.

A Tx coil 200 having a size identical to (identical to) the RX coil 300 is disposed.

In the resonant LLC full bridge type wireless power transmission apparatus, the switching frequency is a wireless characteristic of resonance coupling in which switching is performed at a high frequency of several [MHz] to several tens [MHz]. The resonant LLC half bridge type wireless power transmission apparatus is characterized in that the resonance frequency of the first transmission coil 200 and the reception coil 300 are switched so that the resonant frequencies of the Tx coil 200 and the RX coil 300 coincide with each other do.

The resonance power transmitted from the first Tx coil 200 to the RX coil 300 is transmitted to the lithium-ion battery 11 through the full-bridge type rectifier 60 And the electric power charged in the lithium-ion battery 11 is used to drive the motor of the drone 10.

18 shows a proposed resonant LLC full bridge type wide scope wireless power transmission device.

The proposed resonant LLC full bridge type wireless charging circuit is designed to provide stable zero voltage switching (ZVS) due to resonance of leakage inductor (Llk) - magnetizing inductor (Lm) - resonant capacitor (Cs) .

The proposed LLC full bridge type wireless charging circuit supplies DC power from an AC-DC power supply (31) from an AC power supply (30), and the first to fourth pools Bridge switches 51 to 54 are connected in a bridge structure so that the contacts of the first full bridge switch 51 and the third full bridge switch 53 and the contacts of the second full bridge switch 52 and A real transformer 70 is disposed between the contacts of the fourth full bridge switch 54. The first to fourth full-bridge switches 51 to 54 are turned on through the LLC resonance of the first leakage inductor 45, the magnetizing inductor 47 and the primary resonance capacitor 48 of the transformer 70, (ZVS).

In addition, on the secondary side of the transformer, power is transmitted through resonance on both the primary side and the secondary side of the transformer through the resonance of the second leakage inductor 46 and the secondary side resonance capacitor 49 of the transformer, The resonance power is characterized in that the lithium-ion battery 11 is charged with electric power through the full-bridge type rectifying unit 60.

A Tx coil 250 having a relatively larger size than the RX coil 300 is disposed.

In the resonant LLC half-bridge type wireless power transmission apparatus, the switching frequency includes a wireless charging of self induction and resonance coupling, which performs switching from a frequency of several hundreds of kHz to several tens of MHz, . The resonant LLC half bridge type wireless power transmission apparatus is characterized in that the resonance frequency of the second transmission coil (Tx coil) 250 and the reception coil (RX coil) 300 are matched with each other do.

The resonance power transmitted from the second Tx coil 250 to the RX coil 300 is transmitted to the lithium-ion battery 11 through the full-bridge type rectifier 60 And the electric power charged in the lithium-ion battery 11 is used to drive the motor of the drone 10.

19 shows a detailed circuit of the proposed resonant LLC half-bridge type wireless power transmission device.

The proposed resonant LLC half-bridge type wireless power transmission apparatus (Fig. 19) stably supplies zero voltage switching [ZVS (zero)) due to resonance of leakage inductor Llk- magnetizing inductor Lm- resonance capacitor Cs in the transformer. -Voltage-Switching)] is performed.

The proposed LLC half bridge type wireless charging circuit supplies DC power from an AC-DC power supply 31 from an AC power supply 30, and supplies power to the first and second half bridge switches 41 and 42 The first half bridge switch 41 and the second half bridge switch 41 are connected in series between the source of the second half bridge switch 41 and the contact of the first half bridge switch 41 and the second half bridge switch 41, The first and second half bridge switches 41 and 42 are connected through the LLC resonance of the first leakage inductor 45 of the transformer and the magnetizing inductor 47 of the transformer to the primary resonance capacitor 48 of the transformer 70, (ZVS) is performed.

In addition, on the secondary side of the transformer, power is transmitted through resonance on both the primary side and the secondary side of the transformer through the resonance of the second leakage inductor 46 and the secondary side resonance capacitor 49 of the transformer, The resonance power is characterized in that the lithium-ion battery 11 is charged with electric power through the full-bridge type rectifying unit 60.

The detailed circuit of the proposed resonant LLC half-bridge type wireless power transmission apparatus detects an AC voltage waveform of the primary side resonant capacitor 48 through a first comparator 115, The AC voltage waveform of the primary side resonant capacitor 48 is input to the controller through the second comparator 116. (+) Portion of the output of the second comparator 116 is input to the third comparator 117 for comparison with the control signal of the first sawtooth wave 120, and the (-) portion of the output of the second comparator 116 is input to the third comparator 117, Is input to the fourth comparator 118 for comparison with the control signal of the second sawtooth wave 121 to generate a gate signal.

The waveform of the first sawtooth wave 120 and the waveform of the second sawtooth wave 121 is a horizontal symmetric waveform.

The first AND gate 113 ANDs the output signal of the fourth comparator 118 and the lower switch gate signal Vg2 and outputs a first RS flip- ) 111 to generate an upper switch gate signal Vg1. The second AND gate 114 ANDs the output signal of the third comparator 117 and the upper switch gate signal Vg1 to form a second RS flip-flop, to which the clock signal 119 is input, And the lower switch gate signal Vg2 is generated through the switch 112.

The upper and lower switch gate signals Vg1 and Vg2 control the first half bridge switch 41 and the second half bridge switch 41 through the first and second gate bridge circuits 101 and 102 of the gate driver 100, As a technical feature.

20 shows a detailed circuit of the proposed resonant LLC full bridge type wireless power transmission device.

The proposed resonant LLC full bridge type wireless power transmission apparatus (FIG. 20) can stably supply zero voltage switching (ZVS (Zero)) due to the resonance of the leakage inductor Llk-magnetizing inductor Lm- resonant capacitor Cs in the transformer. -Voltage-Switching)] is performed.

The proposed LLC full bridge type wireless charging circuit supplies DC power from an AC-DC power supply (31) from an AC power supply (30), and the first to fourth pools Bridge switches 51 to 54 are connected in a bridge structure so that the contacts of the first full bridge switch 51 and the third full bridge switch 53 and the contacts of the second full bridge switch 52 and A real transformer 70 is disposed between the contacts of the fourth full bridge switch 54. The first to fourth full-bridge switches 51 to 54 are turned on through the LLC resonance of the first leakage inductor 45, the magnetizing inductor 47 and the primary resonance capacitor 48 of the transformer 70, (ZVS).

In addition, on the secondary side of the transformer, power is transmitted through resonance on both the primary side and the secondary side of the transformer through the resonance of the second leakage inductor 46 and the secondary side resonance capacitor 49 of the transformer, The resonance power is characterized in that the lithium-ion battery 11 is charged with electric power through the full-bridge type rectifying unit 60.

The detailed circuit of the proposed resonant LLC full bridge type wireless power transmission apparatus detects an AC voltage wave of the primary side resonant capacitor 48 through the first comparator 115, The AC voltage waveform of the primary side resonant capacitor 48 is input to the controller through the second comparator 116. (+) Portion of the output of the second comparator 116 is input to the third comparator 117 for comparison with the control signal of the first sawtooth wave 120, and the (-) portion of the output of the second comparator 116 is input to the third comparator 117, Is input to the fourth comparator 118 for comparison with the control signal of the second sawtooth wave 121 to generate a gate signal.

The waveform of the first sawtooth wave 120 and the waveform of the second sawtooth wave 121 is a horizontal symmetric waveform.

The first AND gate 113 performs an AND operation on the output signal of the fourth comparator 118 and the gate signal Vg4 of the third and fourth full bridge switches and outputs a first RS And generates the gate signal Vg3 of the first and second full bridge switches through the flip-flop 111. [ The second AND gate 114 also ANDs the output signal of the third comparator 117 and the gate signal Vg3 of the first and second full bridge switches to generate a second RS flip- And generates a gate signal Vg4 of the third and fourth full bridge switches through a flip-flop 112. [

The gate signal (Vg3) of the first and second full bridge switches and the gate signal (Vg4) of the third and fourth full bridge switches are connected to the full bridge switch The first to fourth full bridge switches 51 to 54 of the control unit 50 are controlled.

In the present invention, a wireless power transmission apparatus of a drone includes an AC-DC power supply unit 31 for outputting a DC power from an AC power supply 30; First and second half bridge switches 41 and 42 for switching a DC power output to the AC-DC power supply 31; A transformer (70) connected between a contact of the first half bridge switch (41) and a second half bridge switch (42) and a source of the second half bridge switch (42); A primary resonant capacitor (48) located on the primary side of the transformer (70); A secondary side resonant capacitor 49 located on the secondary side of the transformer 70; A full bridge type rectifying unit 60 for rectifying the secondary side power of the transformer 70; A lithium-ion battery 11 for charging electric power rectified from the full-bridge type rectifying unit 60; A first comparator 115 for detecting an AC voltage waveform of the primary side resonant capacitor 48; A second comparator (116) for correcting an output voltage of the first comparator (115); (+) Portion of the output of the second comparator 116 has a third comparator 117 for comparing the first sawtooth wave 120 control signal; (-) portion of the output of the second comparator 116 is coupled to a fourth comparator 118 for comparison with the second sawtooth wave 121 control signal; A first AND gate 113 for ANDing the output signal of the fourth comparator 118 and the lower switch gate signal Vg2; A second AND gate 114 for ANDing the output signal of the third comparator 117 and the upper switch gate signal Vg1; A first RS flip-flop 111 for receiving an output of the first AND gate 113 and a clock signal 119 to generate an upper switch gate signal Vg1; And a second RS flip-flop 112 for receiving the output of the second AND gate 114 and the clock signal 119 to generate a bottom switch gate signal Vg2;

And controls the first and second half bridge switches (41, 42) based on an AC voltage of a primary resonance capacitor (48) located on a primary side of the transformer (70) We propose a power transmission device.

Further, the present invention provides a radio transmission apparatus for a drones, comprising: an AC-DC power supply device 31 for outputting a DC power from an AC power supply 30; First to fourth full bridge switches (51 to 54) for switching a DC power output to the AC-DC power supply (31); A transformer 70 contacted between the contacts of the first full bridge switch 51 and the third full bridge switch 53 and the contacts of the second full bridge switch 52 and the fourth full bridge switch 54; A primary resonant capacitor (48) located on the primary side of the transformer (70); A secondary side resonant capacitor 49 located on the secondary side of the transformer 70; A full bridge type rectifying unit 60 for rectifying the secondary side power of the transformer 70; A lithium-ion battery 11 for charging electric power rectified from the full-bridge type rectifying unit 60; A first comparator 115 for detecting an AC voltage waveform of the primary side resonant capacitor 48; A second comparator (116) for correcting an output voltage of the first comparator (115); (+) Portion of the output of the second comparator 116 has a third comparator 117 for comparing the first sawtooth wave 120 control signal; (-) portion of the output of the second comparator 116 is coupled to a fourth comparator 118 for comparison with the second sawtooth wave 121 control signal; A first AND gate 113 for ANDing the output signal of the fourth comparator 118 and the gate signal Vg4 of the third and fourth full bridge switches; A second AND gate 114 for ANDing the output signal of the third comparator 117 and the gate signal Vg3 of the first and second full bridge switches; A first RS flip-flop 111 receiving the output of the first AND gate 113 and the clock signal 119 to generate a gate signal Vg3 of the first and second full bridge switches; And a second RS flip-flop 112 for receiving the output of the second AND gate 114 and the clock signal 119 to generate a gate signal Vg4 of the third and fourth full bridge switches ; And controls the first to fourth full bridge switches (51 to 54) based on an AC voltage of a primary side resonant capacitor (48) located on a primary side of the transformer (70) We propose a power transmission device.

It should be appreciated by those skilled in the art that the present invention can be applied to Drones' wireless power transmission devices by various modifications, and that the scope of the techniques that are technically easy to modify is also within the scope of the present patent .

10: Drones
11: Lithium-ion battery
12: frame
13: Communication module (receiver)
14: Flight controller (FC)
15: Electronic Stability Control (ESC)
16: First transmission (ESC)
17: Second transmission (ESC)
18: Third transmission (ESC)
19: Fourth transmission (ESC)
20: Propeller
21: First propeller
22: Second propeller
23: Third propeller
24: Fourth propeller
25: Motor
30: AC power source
31: AC-DC Power Supply (AC-DC Power Supply)
40: half bridge switch
41: first half bridge switch
42: second half bridge switch
43: a first antiparallel diode
44: second antiparallel diode
45: First Leakage Inductor
46: Second Leakage Inductor
47: magnetizing inductor
48: primary side resonant capacitor
49: secondary side resonance capacitor
50: Full bridge switch
51: First full bridge switch
52: second full bridge switch
53: third full bridge switch
54: fourth full bridge switch
55: 11th reverse-parallel diode
56: twelfth antiparallel diode
57: thirteenth antiparallel diode
58: Fourteenth antiparallel diode
60: Full bridge type rectifying part
61: first rectifying diode
62: second rectifying diode
63: third rectifier diode
64: fourth rectifier diode
65: Output stage capacitor
70: Real transformer
71: Transformer primary winding (Np)
72: Transformer secondary winding (Ns)
73: Ideal transformer
80: Safety equipment
81: 1 axis drones
82: Monitor
83: Three Axis Drones
84: Safety devices Door
85: Dron's 1st Stand
86: a first holder of a dron arranged with a first Tx coil
87: Charging status indicator
88: second holder of a dron arranged with a second Tx coil
93: One touch base
94: One touch bass with Rx coil
100: Gate driver
101: first gate driving circuit
102: second gate driving circuit
111: first RS flip-flop;
112: second RS flip-flop
113: first AND gate
114: second AND gate
115: first comparator
116: second comparator
117: third comparator
118; The fourth comparator
119: clock signal
120: 1st saw tooth
121: 2nd sawtooth
131: first control capacitor
132: second control capacitor
133: control resistance
200: First Tx coil: A transmitter coil having the same size (same size) as the receiver coil
250: Second Tx coil: A transmitter coil having a relatively large size as compared with the receiver coil
300: Receiver coil (RX coil)
350: Wireless power transmission / reception coil
400: converter control section
Clock: clock signal
Id: rectified diode current
Is2: Lower switch current
Im: Magnetization inductor current on primary side of transformer
Ip: Transformer primary current
Is2: Lower switch current
t: time
t0: Time 0
t1: 1st time
t2: the second time
t3: the third hour
Vg1: upper switch gate signal
Vg2: lower switch gate signal
Vg3: gate signal of the first and second full bridge switches
Vg4: gate signal of the third and fourth full bridge switches
Vin: Input voltage
Vs2: Lower switch voltage

Claims (12)

In the wireless power transmission apparatus of the drone,
An AC-DC power supply device 31 for outputting a DC power from the AC power source 30;
First and second half bridge switches 41 and 42 for switching a DC power output to the AC-DC power supply 31;
A transformer (70) connected between a contact of the first half bridge switch (41) and a second half bridge switch (42) and a source of the second half bridge switch (42);
A primary resonant capacitor (48) located on the primary side of the transformer (70);
A secondary side resonant capacitor 49 located on the secondary side of the transformer 70;
A full bridge type rectifying unit 60 for rectifying the secondary side power of the transformer 70;
A lithium-ion battery 11 for charging electric power rectified from the full-bridge type rectifying unit 60;
A first comparator 115 for detecting an AC voltage waveform of the primary side resonant capacitor 48;
A second comparator (116) for correcting an output voltage of the first comparator (115);
(+) Portion of the output of the second comparator 116 has a third comparator 117 for comparing the first sawtooth wave 120 control signal;
(-) portion of the output of the second comparator 116 is coupled to a fourth comparator 118 for comparison with the second sawtooth wave 121 control signal;
A first AND gate 113 for ANDing the output signal of the fourth comparator 118 and the lower switch gate signal Vg2;
A second AND gate 114 for ANDing the output signal of the third comparator 117 and the upper switch gate signal Vg1;
A first RS flip-flop 111 for receiving an output of the first AND gate 113 and a clock signal 119 to generate an upper switch gate signal Vg1;
And a second RS flip-flop 112 for receiving the output of the second AND gate 114 and the clock signal 119 to generate a bottom switch gate signal Vg2;
And controls the first and second half bridge switches (41, 42) based on an AC voltage of a primary resonance capacitor (48) located on a primary side of the transformer (70) Power transmission device In the wireless power transmission apparatus of the drone,
An AC-DC power supply device 31 for outputting a DC power from the AC power source 30;
First to fourth full bridge switches (51 to 54) for switching a DC power output to the AC-DC power supply (31);
A transformer 70 contacted between the contacts of the first full bridge switch 51 and the third full bridge switch 53 and the contacts of the second full bridge switch 52 and the fourth full bridge switch 54;
A primary resonant capacitor (48) located on the primary side of the transformer (70);
A secondary side resonant capacitor 49 located on the secondary side of the transformer 70;
A full bridge type rectifying unit 60 for rectifying the secondary side power of the transformer 70;
A lithium-ion battery 11 for charging electric power rectified from the full-bridge type rectifying unit 60;
A first comparator 115 for detecting an AC voltage waveform of the primary side resonant capacitor 48;
A second comparator (116) for correcting an output voltage of the first comparator (115);
(+) Portion of the output of the second comparator 116 has a third comparator 117 for comparing the first sawtooth wave 120 control signal;
(-) portion of the output of the second comparator 116 is coupled to a fourth comparator 118 for comparison with the second sawtooth wave 121 control signal;
A first AND gate 113 for ANDing the output signal of the fourth comparator 118 and the gate signal Vg4 of the third and fourth full bridge switches;
A second AND gate 114 for ANDing the output signal of the third comparator 117 and the gate signal Vg3 of the first and second full bridge switches;
A first RS flip-flop 111 receiving the output of the first AND gate 113 and the clock signal 119 to generate a gate signal Vg3 of the first and second full bridge switches;
And a second RS flip-flop 112 for receiving the output of the second AND gate 114 and the clock signal 119 to generate a gate signal Vg4 of the third and fourth full bridge switches ;
And controls the first to fourth full bridge switches (51 to 54) based on an AC voltage of a primary side resonant capacitor (48) located on a primary side of the transformer (70) Power transmission device The method according to claim 1 or 2,
Characterized in that the energy stored in the lithium-ion battery (11) rotates the propeller (20) through the motor (25) of the drones The method according to claim 1 or 2,
Characterized in that the Tx coil and RX coil of the transformer (70) are all plate-type coils. The method according to claim 1 or 2,
The transformer 70 is composed of a receiving coil 300 and a first transmitting coil 200 having the same size as the receiving coil 300. [ The method according to claim 1 or 2,
The transformer 70 is composed of a second transmission coil 250 having a relatively large size as compared with the receiving coil 300 and the receiving coil 300. [ The method according to claim 1 or 2,
Wherein the first leakage inductor (45) -magnetization inductor (47) on the primary side of the transformer (70) - the primary resonance capacitor (48) performs LLC resonance. The method according to claim 1 or 2,
And the second leakage inductor (46) - secondary resonance capacitor (49) on the secondary side of the transformer (70) performs resonance. In the wireless power transmission apparatus of the drone,
An AC-DC power supply device 31 for outputting a DC power from the AC power source 30;
First and second half bridge switches 41 and 42 for switching a DC power output to the AC-DC power supply 31;
A transformer (70) connected between a contact of the first half bridge switch (41) and a second half bridge switch (42) and a source of the second half bridge switch (42);
A primary resonant capacitor (48) located on the primary side of the transformer (70);
A first comparator 115 for detecting an AC voltage waveform of the primary side resonant capacitor 48;
A second comparator (116) for correcting an output voltage of the first comparator (115);
(+) Portion of the output of the second comparator 116 has a third comparator 117 for comparing the first sawtooth wave 120 control signal;
(-) portion of the output of the second comparator 116 includes a fourth comparator 118 for comparison with the second sawtooth wave 121 control signal;
And controls the first and second half bridge switches (41, 42) based on an AC voltage of a primary resonance capacitor (48) located on a primary side of the transformer (70) Power transmission device The method according to claim 9,
A first AND gate 113 for ANDing the output signal of the fourth comparator 118 and the lower switch gate signal Vg2;
And a second AND gate (114) for ANDing the output signal of the third comparator (117) and the upper switch gate signal (Vg1) The method according to claim 9,
Wherein a waveform of the first sawtooth wave (120) and a waveform of the second sawtooth wave (121) are horizontally symmetrical to each other. The method according to claim 9,
Wherein the first leakage inductor (45) -magnetization inductor (47) on the primary side of the transformer (70) - the primary resonance capacitor (48) performs LLC resonance.

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