A power supply system for fixed-wing unmanned aerial vehicle

Abstract

The present invention discloses a fixed-wing unmanned aerial vehicle power supply system, belonging to the technical field of fixed-wing unmanned aerial vehicles; the system comprises an alternating current generator, an airborne voltage-stabilized power supply, an airborne battery pack, a ground direct current power supply, and an airborne cable; the alternating current generator is the main power supply of the aircraft power supply system, converts mechanical energy provided by the aircraft engine into electrical energy, is connected to the airborne voltage-stabilized power supply through the airborne cable, and provides a three-phase alternating current input voltage for the airborne voltage-stabilized power supply; the airborne voltage-stabilized power supply comprises an input rectification and filtering circuit, and a DC-DC power supply module; the airborne battery pack is connected to the airborne voltage-stabilized power supply through the airborne cable; the ground direct current power supply comprises an input filtering module, an AC-DC power supply module, an output filtering circuit, an input socket, an input cable, an output socket, an output cable, an input control switch, and an output control switch; the power generation technology and rectification technology involved in the present invention are relatively mature, and the power supply quality and reliability are high, so as to ensure that the unmanned aerial vehicle can be applied to harsh outdoor environments.

Description

Technical Field

[0001] The invention belongs to the technical field of fixed-wing unmanned aerial vehicles, and in particular relates to a power supply system for a fixed-wing unmanned aerial vehicle. Background Art

[0002] A drone is a powered, controllable, reusable unmanned aerial vehicle that can carry multiple mission equipment and perform multiple missions. The advantages of drones, such as flexible use, high precision, low requirements for combat environment, long-term / real-time / uninterrupted information perception and transmission, low maintenance costs, and no risk of casualties, have made their broad prospects for use in modern information warfare recognized and highly valued by countries around the world.

[0003] The modern battlefield requires UAVs to have long flight time, strong load capacity, and flexible maneuverability to meet the needs of harsh field environments. The power supply system is an important part of the UAV system. During the operation of the entire system, it provides stable and reliable energy for the onboard equipment and ground control and support systems. Its working status and operation quality will directly affect the flight safety of the aircraft and the normal operation of the ground control system. For this reason, the power supply system must have high power supply quality and reliability.

[0004] At present, most of the existing technologies are power supply systems for civil rotary-wing UAVs, and there is little research on power supply systems for military fixed-wing UAVs that meet the harsh field environment. Invention patent 201620504614.8 proposes "a UAV power supply system", and the shortcomings in the research on the power supply system are: the AC power output by the generator is divided into two parts after rectification and filtering, one part is used to charge the battery, and the other part is used to power the electrical equipment, thereby reducing the available power of the electrical equipment and shortening the flight time of the UAV; and the power supply system includes an onboard intelligent charging unit and a constant voltage unit, which increases the weight of the onboard power supply system. Summary of the invention

[0005] Technical issues to be solved:

[0006] In order to avoid the shortcomings of the prior art, the present invention proposes a fixed-wing UAV power supply system to ensure that the UAV has a long flight time and can meet the requirements of use in harsh outdoor environments.

[0007] The technical solution of the present invention is: a fixed-wing UAV power supply system, characterized in that: it includes an AC generator, an airborne voltage-stabilized power supply, an airborne battery pack, a ground DC power supply, and an airborne cable, wherein the AC generator is the main power supply of the aircraft power supply system, converts the mechanical energy provided by the aircraft engine into electrical energy, is connected to the airborne voltage-stabilized power supply through the airborne cable, and provides a three-phase AC input voltage for the airborne voltage-stabilized power supply;

[0008] The onboard regulated power supply comprises an input rectifier filter circuit and a DC-DC power supply module. The input rectifier filter circuit rectifies the three-phase AC power provided by the generator into DC power. The DC-DC power supply module converts the DC power output by the rectifier filter circuit into four-way DC power for use by various electrical equipment on the aircraft.

[0009] The onboard battery pack is connected to the onboard voltage-stabilized power supply through an onboard cable. The direct current output by the onboard battery pack is divided into three paths. One path is directly output for use by the onboard electrical equipment; the other two paths of direct current are converted by the DC-DC power supply module of the onboard voltage-stabilized power supply. If the main power supply fails when the UAV is performing a mission, the system enters an emergency mode and uses the onboard battery pack for power supply. During the recovery phase of the UAV, when the generator stops working, the onboard battery pack replaces the main power supply to provide power to the entire device.

[0010] The ground DC power supply includes an input filter module, an AC-DC power supply module, an output filter circuit, an input socket, an input cable, an output socket, an output cable, an input control switch, and an output control switch; the input filter module filters the connected 220V / 50Hz mains power, the AC-DC power supply module converts the filtered AC power into two DC powers, the output filter circuit filters the two DC powers, the input cable and the input socket connect the mains power to the ground DC power supply, the output socket and the output cable connect the ground DC power supply to the airborne cable, and provide DC power supply for the entire device during ground debugging, testing, power-on inspection and pre-flight preparation of the unmanned aerial vehicle, the input control switch controls the input AC 220V, and the output control switch is used to control the on-off of the two output voltages;

[0011] The airborne cable is used to connect the power supply equipment and the power-consuming equipment to provide stable and reliable power for the entire machine power-consuming equipment; the airborne cable is also used to connect between power-consuming equipment to achieve signal transmission between various devices.

[0012] A further technical solution of the present invention is: the DC-DC power supply module of the airborne voltage-stabilized power supply converts the DC power output by the rectifier and filter circuit into four DC powers: two 28±1V, one 12±1V, and one 7±1V DC.

[0013] A further technical solution of the present invention is: the onboard battery pack is a lithium-ion battery pack.

[0014] A further technical solution of the present invention is that the other two direct currents output by the onboard battery pack are converted into one 12±1V direct current and one 7±1V direct current through a DC-DC power supply module of an onboard voltage-stabilized power supply.

[0015] A further technical solution of the present invention is: the AC-DC power supply module of the ground DC power supply converts the filtered AC power into two 28V DC powers.

[0016] A further technical solution of the present invention is: the airborne cable includes a connector, a wire, a switch, and a relay; the connector and the wire are used to connect the power supply equipment and the power-consuming equipment to provide electrical energy to the entire machine power-consuming equipment, and are also used to connect between power-consuming equipment to realize signal transmission between various devices, and the switch and relay are used to control the on and off of certain signals.

[0017] Beneficial Effects

[0018] The beneficial effects of the present invention are:

[0019] (1) The onboard battery pack of the present invention is charged by a ground-based intelligent charger, so the weight of the onboard power supply system is relatively light, and the electric energy output by the generator is converted by the onboard voltage-stabilized power supply and then provided to the power-consuming equipment, thereby ensuring an ultra-long flight time of the UAV.

[0020] (2) The power generation technology and rectification technology involved in the present invention are relatively mature, and the power supply quality and reliability are high; the AC generator, airborne voltage-stabilized power supply, airborne battery pack, ground DC power supply, and airborne cable of the power supply system of the present invention fully consider the requirements of miniaturization, environmental adaptability, reliability, maintainability, testability, security, safety, and electromagnetic compatibility from the selection of components to the design of the product. The finished products have passed the environmental adaptability test in accordance with the relevant requirements of GJB150, ensuring that the UAV can be used in harsh outdoor environments.

[0021] (3) The onboard battery pack of the present invention serves as an emergency power source, which meets the power supply requirements of the UAV in emergency situations and during the parachute recovery phase. It can also be applied to other recovery methods, and can provide a design guide for domestic and foreign UAV piloted aircraft. It is applicable to various unmanned aerial vehicles and has broad military and civilian value.

[0022] (4) The onboard voltage-stabilized power supply of the present invention can output three types of direct current: (28±1)V, (12±1)V, and (7±1)V, thus meeting the different power supply requirements of various electrical equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The present invention is a schematic diagram of the principle of a fixed-wing UAV power supply system.

[0024] Figure 2 The present invention is a schematic diagram of the principle of an onboard regulated power supply for a fixed-wing UAV.

[0025] Figure 3 The present invention is a schematic diagram of the principle of a ground DC power supply for a fixed-wing UAV. DETAILED DESCRIPTION

[0026] The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0027] This embodiment is a power supply system for a fixed-wing UAV.

[0028] like Figure 1 As shown, the present invention provides a fixed-wing UAV power supply system, including an AC generator, an airborne voltage-stabilized power supply, an airborne battery pack, a ground DC power supply, and an airborne cable. The AC generator is the main power supply of the aircraft power supply system, which converts the mechanical energy provided by the aircraft engine into electrical energy, is connected to the airborne voltage-stabilized power supply through an airborne cable, and provides a three-phase AC input voltage for the airborne voltage-stabilized power supply.

[0029] like Figure 2 As shown, the airborne regulated power supply includes an input rectifier and filter circuit, a DC-DC power supply module, an input socket, an output socket, and an axial flow fan. The input rectifier and filter circuit rectifies the three-phase AC power provided by the generator into DC power. The DC-DC power supply module converts the DC power output by the rectifier and filter circuit into two (28±1)V, one (12±1)V, and one (7±1)V DC power. The input socket is used to connect the AC generator output to the airborne regulated power supply input, and the output socket is used to connect the four output voltages of the airborne regulated power supply to the airborne cable bus. Each electrical device is connected to the corresponding airborne cable bus according to its own power demand. The axial flow fan is used to dissipate heat inside the airborne regulated power supply to ensure stable and reliable operation of the airborne regulated power supply.

[0030] The onboard battery pack comprehensively considers factors such as operating temperature, volume, weight, battery energy density, safety and large current discharge capability, and adopts a lithium-ion battery pack with good safety, high energy density and no memory effect, such as Figure 2 As shown, the onboard battery pack is connected to the onboard regulated power supply through an onboard cable. The DC power output by the onboard battery pack is divided into three paths, one of which is directly output, and the other two are converted into one (12±1)V and one (7±1)V DC power through the switching power supply module of the onboard regulated power supply. If the main power supply fails when the UAV is performing a mission, the system enters the emergency mode and uses the onboard battery pack for power supply. During the recovery stage of the UAV, when the generator stops working, the onboard battery pack replaces the main power supply to provide power to the entire equipment.

[0031] like Figure 3As shown, the ground DC power supply includes an input filter module, an AC-DC power supply module, an input socket, an input cable, an output socket, an output cable, an input control switch, and an output control switch. The input filter module filters the connected 220V / 50Hz mains power, the AC-DC power supply module converts the filtered AC power into two 28V DC power supplies, the input cable and the input socket connect the mains power to the ground DC power supply, the output socket and the output cable connect the ground DC power supply to the airborne cable, and provide DC power supply for the entire device during ground debugging, testing, power-on inspection, and pre-flight preparation of the UAV, the input control switch controls the input AC 220V, and the output control switch is used to control the on-off of the two output voltages.

[0032] The onboard cable includes connectors, wires, switches, and relays. The connectors and wires are used to connect power supply equipment and power consumption equipment to provide stable and reliable power for the whole machine power consumption equipment. They are also used to connect power consumption equipment to achieve signal transmission between various equipment. The switches and relays are used to control the on and off of certain signals.

[0033] The specific power supply method includes the following steps:

[0034] (1) UAV ground joint test phase:

[0035] a) Ground DC power supply: connect the ground DC power input to the mains through the input cable, connect the ground DC power output to the airborne cable through the output cable, connect the airborne cable to each power-consuming device, turn on the ground DC power input control switch, and after confirming that the input is correct, turn on the two-way output control switch of the ground DC power supply, then the ground DC power supply outputs two (28±1)V through the airborne cable to each power-consuming device;

[0036] b) Power supply by onboard battery pack: Connect the fully charged onboard battery pack to the onboard cable, connect the input and output sockets of the onboard voltage-stabilized power supply to the onboard cable, and connect the onboard cable to each power-consuming device. Then, the onboard battery pack outputs one channel of (28±1)V, one channel of (12±1)V, and one channel of (7±1)V DC to each power-consuming device through the onboard cable;

[0037] c) Generator power supply: Connect the input socket and output socket of the onboard voltage-stabilized power supply to the onboard cable respectively, connect the onboard cable to each electrical device, start the engine, and the two (28±1)V, one (12±1)V, and one (7±1)V DC power of the onboard voltage-stabilized power supply will be output to each electrical device through the onboard cable.

[0038] (2) During the take-off and cruising phases of the UAV, the ground DC power supply output terminal is disconnected from the airborne cable, and each connector of the airborne cable is connected to the corresponding equipment to ensure that the connection is tight and correct. All preparations before take-off are completed, and the engine is started. The UAV is launched, climbs, and finally enters the air cruising phase. During this process, the engine drives the generator to generate three-phase AC power, and the airborne regulated power supply converts the three-phase AC power into two (28±1)V, one (12±1)V, and one (7±1)V DC power outputs through the airborne cable to various electrical equipment.

[0039] (3) During the UAV's emergency and recovery phases, if the main power supply fails and cannot provide power, the UAV will enter the emergency phase, and the onboard battery pack will replace the main power supply to supply power to the key electrical equipment on board. At the same time, the UAV will enter the recovery phase from the emergency phase, and the onboard battery pack will continue to provide power until the UAV is safely recovered.

[0040] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and intent of the present invention.

Claims

1. A fixed-wing UAV power supply system, characterized in that: It includes an AC generator, an onboard voltage-stabilized power supply, an onboard battery pack, a ground DC power supply, and an onboard cable. The AC generator is the main power supply of the aircraft power supply system, converts the mechanical energy provided by the aircraft engine into electrical energy, is connected to the onboard voltage-stabilized power supply through the onboard cable, and provides a three-phase AC input voltage for the onboard voltage-stabilized power supply. The onboard regulated power supply comprises an input rectifier filter circuit and a DC-DC power supply module. The input rectifier filter circuit rectifies the three-phase AC power provided by the generator into DC power. The DC-DC power supply module converts the DC power output by the rectifier filter circuit into four-way DC power for use by various electrical equipment on the aircraft. The onboard battery pack is connected to the onboard voltage-stabilized power supply through an onboard cable. The direct current output by the onboard battery pack is divided into three paths. One path is directly output for use by the onboard electrical equipment; the other two paths of direct current are converted by the DC-DC power supply module of the onboard voltage-stabilized power supply. If the main power supply fails when the UAV is performing a mission, the system enters an emergency mode and uses the onboard battery pack for power supply. During the recovery phase of the UAV, when the generator stops working, the onboard battery pack replaces the main power supply to provide power to the entire device. The ground DC power supply comprises an input filter module, an AC-DC power supply module, an output filter circuit, an input socket, an input cable, an output socket, an output cable, an input control switch, and an output control switch; The input filter module filters the connected 220V / 50Hz mains power, the AC-DC power module converts the filtered alternating current into two direct currents, the output filter circuit filters the two direct currents, the input cable and the input socket connect the mains power to the ground DC power supply, the output socket and the output cable connect the ground DC power supply to the airborne cable, and provide DC power supply for the whole device during the ground debugging, testing, power-on inspection and pre-flight preparation of the UAV, the input control switch controls the input AC 220V, and the output control switch is used to control the on and off of the two output voltages; The onboard cable is used to connect the power supply equipment and the power-consuming equipment to provide stable and reliable power for the whole machine power-consuming equipment; the onboard cable is also used to connect between power-consuming equipment to realize signal transmission between various equipment; The DC-DC power supply module of the airborne voltage-stabilized power supply converts the DC power output by the rectifier and filter circuit into four DC power channels: two 28±1V DC channels, one 12±1V DC channel, and one 7±1V DC channel; The other two direct currents output by the onboard battery pack are converted into one 12±1V direct current and one 7±1V direct current through a DC-DC power supply module of an onboard voltage-stabilized power supply.

2. The fixed-wing UAV power supply system according to claim 1, characterized in that: The onboard battery pack is a lithium-ion battery pack.

3. The fixed-wing UAV power supply system according to claim 1, characterized in that: The AC-DC power supply module of the ground DC power supply converts the filtered AC power into two 28V DC power supplies.

4. The fixed-wing UAV power supply system according to claim 1, characterized in that: The airborne cable includes connectors, wires, switches, and relays; the connectors and wires are used to connect power supply equipment and power-consuming equipment to provide electrical energy to the entire machine's power-consuming equipment, and are also used to connect between power-consuming equipment to achieve signal transmission between various devices. The switches and relays are used to control the on and off of certain signals.

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