Agricultural protection unmanned aerial vehicle battery heat dissipation control system

Abstract

A plant protection drone battery heat dissipation control system is disclosed. The control device contains a control chip electrically connected to the display screen, and the input terminal of the control chip is electrically connected to the control buttons. The control device includes a power supply circuit, a battery charging and discharging control and detection circuit, and a fan control circuit. Through the power supply circuit, battery charging and discharging control and detection circuit, and fan control circuit, the heat dissipation control, charging and discharging control, and battery status detection of the battery can be realized. It can also select between external power supply and battery power supply. The device has a simple structure and can achieve the above functions with very few electrical components. The entire control system has a simple structure and reliable principle, and can provide great convenience for drone batteries in field operations.

Description

Technical Field

[0001] This invention relates to the field of unmanned aerial vehicle (UAV) equipment technology, and more specifically to a plant protection UAV battery heat dissipation control system. Background Technology

[0002] With the continuous development and expansion of the drone industry, drones have gradually begun to be used in aerial photography, agriculture, plant protection, WeChat selfies, express delivery, disaster relief, wildlife observation, infectious disease monitoring, surveying, news reporting, power line inspection, disaster relief, and film and television shooting. In the field of plant protection, due to the continuous improvement of the endurance and power characteristics of existing drones, drones are gradually replacing the original manual or mechanical operations, especially in the application of liquid or granular pesticides. Current plant protection drones can carry up to 30-50KG of pesticides for long-term application and can automatically apply pesticides according to a set route, which has advantages that cannot be matched by human or mechanical methods.

[0003] When using drones to spray liquid pesticides, multiple batteries are usually required due to the rapid energy consumption. When the operating area is large, even a diesel charger may be needed. In addition to powering the drone, the drone battery also needs to power other spraying operations, such as pesticide mixing pumps. Since plant protection operations are carried out outdoors, the temperature is usually high during the period when plant growth is fastest. The internal chemical reactions during battery charging and discharging also raise the temperature. All of these factors keep the temperature of the drone battery high, sometimes reaching 60 degrees Celsius. The high temperature itself carries away a lot of heat and also reduces the battery life. At the same time, when the operation time is long, the battery needs to be charged, which also generates heat. Therefore, a device is needed to cool the battery during the charging and discharging process.

[0004] Existing technologies include devices for cooling drone batteries. For example, Chinese patent document CN 216054898U describes a plant protection drone battery heat sink. The battery is powered by a bracket and a fan is controlled to rotate to cool the battery. However, such devices can only cool the battery and cannot know the battery's status or charge the battery. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a heat dissipation control system for agricultural drone batteries, which can intelligently control the heat dissipation and charging / discharging of drone batteries.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0007] A battery heat dissipation control system for an agricultural protection drone includes a battery heat dissipation bracket, which is a cuboid frame structure. Multiple cooling fans are embedded between the four side frames of the cuboid, with the fan ducts facing inwards. The cooling fans are connected in parallel and electrically connected to a control device. One end of the control device has a power plug. The interior of the cuboid frame is hollow to allow the battery to pass through, and the frame has battery connection terminals for electrical connection to the battery.

[0008] The control device is electrically connected to the battery terminal. The control device contains a control chip, which is electrically connected to the display screen. The input terminal of the control chip is electrically connected to the control buttons. The control device contains a power supply circuit, a battery charging and discharging control and detection circuit, and a fan control circuit. The power supply circuit provides power to the control device and the battery through the power plug. The battery charging and discharging control and detection circuit allows selection of whether to charge or discharge the battery and detects the battery status. The fan control circuit controls the cooling fan.

[0009] The power supply circuit structure described above is as follows:

[0010] The power plug is connected to the input terminal of the rectifier bridge, and the output terminal of the rectifier bridge is electrically connected to the voltage regulator chip. The voltage regulator chip provides charging power and control chip power. The controller battery and energy storage capacitor are connected in parallel to the output terminal of the rectifier bridge.

[0011] The above-mentioned battery charging and discharging control and detection circuit structure is as follows:

[0012] The charging power supply is electrically connected to the battery through a charging control relay, and the control input terminal of the charging control relay is electrically connected to the output terminal of the control chip.

[0013] The battery is electrically connected to the discharge power supply via a discharge control relay, and the control input terminal of the discharge control relay is electrically connected to the output terminal of the control chip.

[0014] The aforementioned positive terminal of the battery is electrically connected to the battery status detection signal circuit, which consists of multiple resistors connected in series. The other end of the series circuit is connected to ground (GND), and the contact between each resistor is electrically connected to an input contact of the control chip.

[0015] The fan control circuit structure is as follows:

[0016] The speed control knob and the cooling fan form a speed control series circuit. The power supply is electrically connected to the speed control series circuit through the cooling fan control relay. The control input terminal of the cooling fan control relay is electrically connected to the output terminal of the control chip.

[0017] The aforementioned battery connection terminal is equipped with vertical conductive posts, which are divided into two groups. The conductive posts are used to contact the positive and negative terminals of the battery to draw power.

[0018] The present invention provides a heat dissipation control system for a plant protection drone battery. Through the power supply circuit, battery charging and discharging control and detection circuit and fan control circuit in the control device, it can realize heat dissipation control of the battery, charge and discharge control of the battery and battery status detection. It can also select between external power supply or battery power supply. The device has a simple structure and can realize the above functions with very few electrical components. The entire control system has a simple structure and reliable principle, and can provide great convenience for drone batteries in field operations. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0020] Figure 1 This is a schematic diagram of the heat dissipation control system of the present invention;

[0021] Figure 2 This is a schematic diagram of the control device.

[0022] Figure 3 This is a schematic diagram of the structure of the battery heat dissipation bracket;

[0023] Figure 4 This is a structural diagram of the battery of the present invention;

[0024] Figure 5 Electrical principles of control devices Figure 1 ;

[0025] Figure 6 Electrical principles of control devices Figure 2 ;

[0026] Figure 7 Electrical principles of control devices Figure 3 ;

[0027] Figure 8 Electrical principles of control devices Figure 4 .

[0028] The components include: battery heat dissipation bracket 1, frame rod 11, fixing block 12, connection hole 13, square tube 14, battery connection terminal 15, cooling fan 2, fan fixing hole 21, control device 3, power plug 31, speed adjustment knob 32, display screen 33, control button 34, control chip 35, battery 4, battery positive and negative tabs 41, charging power supply 5, discharging power supply 6, charging control relay 7, discharging control relay 8, battery status detection signal circuit 9, cooling fan control relay 10, rectifier bridge 16, voltage regulator chip 17, controller battery 18, and energy storage capacitor 19. Detailed Implementation

[0029] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0030] like Figure 1-8 As shown, a plant protection drone battery heat dissipation control system includes a battery heat dissipation bracket 1, which is a cuboid frame structure. Multiple cooling fans 2 are embedded between the four side frames of the cuboid. The airflow direction of the cooling fans 2 faces inwards from the frame. The cooling fans 2 are connected in parallel and electrically connected to a control device 3. One end of the control device 3 is equipped with a power plug 31. The interior of the cuboid frame is hollow to allow the battery 4 to pass through. Battery connection terminals 15 are provided on the frame for electrical connection to the battery 4.

[0031] The control device 3 is electrically connected to the battery connection terminal 15. The control device 3 contains a control chip 35, which is electrically connected to the display screen 33. The input terminal of the control chip 35 is electrically connected to the control button 34. The control device 3 contains a power supply circuit, a battery charging and discharging control and detection circuit, and a fan control circuit. The power supply circuit can provide power to the control device 3 and the battery 4 through the power plug 31. The battery charging and discharging control and detection circuit can select whether to charge or discharge the battery and detect the battery status. The fan control circuit can control the cooling fan 2.

[0032] When battery 4 is placed in battery heat dissipation bracket 1, battery connection terminal 15 is connected to battery 4, and battery 4 can power control device 3 and control cooling fan 2 for cooling. When power plug 31 is connected to external AC power, the battery can be charged and the battery status can be detected. The battery mode and fan control status are input and controlled by control button 34. Battery status and control information are displayed on display screen 33.

[0033] The power supply circuit structure described above is as follows:

[0034] The power plug 31 is connected to the input terminal of the rectifier bridge 16, and the output terminal of the rectifier bridge 16 is electrically connected to the voltage regulator chip 17. The voltage regulator chip 17 provides power to the charging power supply 5 and the control chip 35. The output terminal of the rectifier bridge 16 is connected in parallel to the controller battery 18 and the energy storage capacitor 19.

[0035] like Figure 8As shown, when the power plug 31 is connected to an external AC power source, the AC power is rectified into DC by the rectifier bridge 16, and then converted into different voltage levels by different voltage regulator chips 17. The LM7824 voltage regulator provides 24V DC voltage, which can be used as a charging power source for the battery and a power source for the cooling fan 2. The LM7803 voltage regulator provides 3.6V DC voltage, which can provide power for the chip and the display screen 33. After the power plug 31 is unplugged, the controller battery 18 and the energy storage capacitor 19 can provide power for a period of time.

[0036] The above-mentioned battery charging and discharging control and detection circuit structure is as follows:

[0037] The charging power supply 5 is electrically connected to the battery 4 through the charging control relay 7, and the control input terminal of the charging control relay 7 is electrically connected to the output terminal of the control chip 35.

[0038] Battery 4 is electrically connected to discharge power supply 6 via discharge control relay 8, and the control input terminal of discharge control relay 8 is electrically connected to the output terminal of control chip 35.

[0039] like Figure 6 As shown, when the output signal BATCH of the control chip 35 is high, the coil of the charging control relay 7 is energized and the charging power supply 5 charges the battery 4.

[0040] When the output signal SUP of the control chip 35 is low, the coil of the discharge control relay 8 is energized and the battery 4 supplies power to the discharge power supply 6 terminal.

[0041] The BATCH and SUP signals are interlocked within the control chip 35, meaning that the battery 4 can only select one of the states at a time: charging or discharging. The selection of which state to use is controlled by the control button 34.

[0042] The positive terminal of the aforementioned battery 4 is electrically connected to the battery status detection signal circuit 9. The battery status detection signal circuit 9 is composed of multiple resistors connected in series. The other end of the series circuit is connected to ground (GND), and the contact between each resistor is electrically connected to an input contact of the control chip 35.

[0043] Since the cutoff voltage of the input terminal of the control chip 35 is a characteristic parameter, a high level input signal indicates that the input voltage is greater than the cutoff voltage. This characteristic is used to set the resistance value of each resistor so that the voltage ratio at the junction of each resistor is constant. When charging, DECT3-DECT5 sequentially reach the high level of the input terminal, it means that the battery 4 has reached a certain percentage of charge. When discharging, DECT5-DECT3 sequentially become the low level of the input terminal, which means that the battery 4 has fallen below a certain percentage of charge.

[0044] The above-mentioned fan control circuit structure is as follows:

[0045] The speed control knob 32 and the cooling fan 2 form a speed control series circuit. The power supply is electrically connected to the speed control series circuit through the cooling fan control relay 10. The control input terminal of the cooling fan control relay 10 is electrically connected to the output terminal of the control chip 35.

[0046] like Figure 7 As shown, the fan starts and stops by the FAN signal of the control chip 35, and the speed is adjusted by adjusting the voltage across the cooling fan 2 by adjusting the speed control knob 32. The VCC power supply can be provided by an external power supply or by the battery 4.

[0047] The battery connection terminal 15 is provided with vertical conductive posts, which are divided into two groups. The conductive posts are used to contact the positive and negative battery tabs 41 of the battery 4 to draw power.

Claims

1. An agricultural unmanned aerial vehicle battery heat dissipation control system, characterized in that, The device includes a battery heat dissipation bracket (1), which is a rectangular frame structure. Multiple cooling fans (2) are embedded between the four side frames of the rectangular frame. The air ducts of the cooling fans (2) face inwards from the frame. The cooling fans (2) are connected in parallel and electrically connected to the control device (3). One end of the control device (3) is equipped with a power plug (31). The interior of the rectangular frame is hollow to allow the battery (4) to pass through. The frame is equipped with a battery connection terminal (15) for electrical connection with the battery (4). The control device (3) is electrically connected to the battery connection terminal (15). The control device (3) is equipped with a control chip (35). The control chip (35) is electrically connected to the display screen (33). The input terminal of the control chip (35) is electrically connected to the control button (34). The control device (3) is equipped with a power supply circuit, a battery charging and discharging control and detection circuit and a fan control circuit. The power supply circuit provides power to the control device (3) and the battery (4) through the power plug (31). The battery charging and discharging control and detection circuit selects whether to charge or discharge the battery and detects the battery status. The fan control circuit controls the cooling fan (2). The power supply circuit structure is as follows: The power plug (31) is connected to the input terminal of the rectifier bridge (16), and the output terminal of the rectifier bridge (16) is electrically connected to the voltage regulator chip (17). The voltage regulator chip (17) provides the charging power (5) and the power supply of the control chip (35). The output terminal of the rectifier bridge (16) is connected in parallel with the controller battery (18) and the energy storage capacitor (19). The battery charging and discharging control and detection circuit structure is as follows: The charging power supply (5) is electrically connected to the battery (4) through the charging control relay (7), and the control input terminal of the charging control relay (7) is electrically connected to the output terminal of the control chip (35). The battery (4) is electrically connected to the discharge power supply (6) through the discharge control relay (8), and the control input terminal of the discharge control relay (8) is electrically connected to the output terminal of the control chip (35); The positive terminal of the battery (4) is electrically connected to the battery state detection signal circuit (9). The battery state detection signal circuit (9) is composed of multiple resistors connected in series. The other end of the series circuit is connected to ground GND. The contact between each resistor is electrically connected to an input contact of the control chip (35). When the output signal BATCH of the control chip (35) is high, the coil of the charging control relay (7) is energized and the charging power supply (5) charges the battery (4). When the output signal SUP of the control chip (35) is low, the coil of the discharge control relay (8) is energized and the battery (4) supplies power to the terminal of the discharge power supply (6). The BATCH signal and the SUP signal are interlocked in the control chip (35), meaning that the battery (4) can only select one of the states of charging or discharging at the same time, and the state to be selected is controlled by the control button (34). The positive terminal of the battery (4) is electrically connected to the battery status detection signal circuit (9). The battery status detection signal circuit (9) is composed of multiple resistors connected in series. The other end of the series circuit is connected to ground GND. The contact between each resistor is electrically connected to an input contact of the control chip (35). Since the cutoff voltage of the input terminal of the control chip (35) is a characteristic parameter, when the input terminal signal is high, it means that the input terminal voltage is greater than the cutoff voltage. Using this characteristic, the resistance value of each resistor is set so that the voltage ratio at the junction of each resistor is constant. When charging, when DECT3-DECT5 reach the high level of the input terminal in sequence, it means that the battery (4) has reached a certain percentage of charge. When discharging, when DECT5-DECT3 change to the low level of the input terminal in sequence, it means that the battery (4) has a lower percentage of charge.

2. The plant protection drone battery heat dissipation control system according to claim 1, characterized in that, The structure of the fan control circuit is as follows: The speed control knob (32) and the cooling fan (2) form a speed control series circuit. The power supply is electrically connected to the speed control series circuit through the cooling fan control relay (10). The control input terminal of the cooling fan control relay (10) is electrically connected to the output terminal of the control chip (35).

3. The plant protection drone battery heat dissipation control system according to claim 2, characterized in that, The battery connection terminal (15) is provided with vertical conductive posts. The conductive posts are divided into two groups. The conductive posts are used to contact the positive and negative battery tabs (41) of the battery (4) to draw power.

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