Special DC power supply system for high-reliability airborne equipment

Abstract

The invention belongs to the technical field of aircraft power supply system design, and discloses a high-reliability airborne equipment dedicated DC power supply system, which comprises a 1 # permanent magnet machine, a 2 # permanent magnet machine, a 1 # rectification box, a 2 # rectification box, a 1 # main bus bar, a 2 # main bus bar, a 1 # distribution box and a 2 # distribution box, the first permanent magnet machine and the second permanent magnet machine are driven by the main speed reducer to output two paths of three-phase alternating currents, and the two paths of three-phase alternating currents are transmitted to the first rectification box and the second rectification box respectively. The 1 # rectification box and the 2 # rectification box convert three-phase alternating current into 29V direct current and supply power to the 1 # distribution box and the 2 # distribution box. The 1 # main bus bar and the 2 # main bus bar respectively supply power to the 1 # distribution box and the 2 # distribution box through the fuse; the 1 # power distribution box and the 2 # power distribution box enable four paths of direct current input by the 1 # rectification box, the 2 # rectification box, the 1 # main bus bar and the 2 # main bus bar to be isolated and connected in parallel through a diode and then supply power to key electric equipment. According to the invention, the problem that the power supply demand cannot be met by the emergency power supply system is solved, and the power supply reliability of the electric equipment is greatly improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of aircraft power supply system design, and particularly relates to a high-reliability special DC power supply system for airborne equipment. BACKGROUND

[0002] The DC airborne electrical equipment is mainly powered by the aircraft main DC power supply system and the emergency power supply system. The main DC power supply system is generally composed of a DC generator or a voltage rectifier, and the emergency power supply system is generally composed of a battery pack. When the main DC power supply system is in normal operation, the electrical equipment is powered by the main DC power supply system; when the main DC power supply system fails, the electrical equipment is powered by the battery pack.

[0003] For key airborne electrical equipment (such as a flight tube system), when the main DC power supply system fails, only relying on the emergency power supply system for power supply cannot meet the power supply demand. SUMMARY

[0004] The application aims at the situation that the power supply demand cannot be met by relying on the emergency power supply system, and provides a high-reliability special DC power supply system for airborne equipment, which adopts a redundant design idea, and is composed of a permanent magnet generator and a rectifier box to form a special power supply system and is connected in parallel with the main power supply system to supply power to the electrical equipment, thereby greatly improving the power supply reliability of the electrical equipment.

[0005] In order to solve the above technical problems, the application provides the following technical solutions. A high-reliability special DC power supply system for airborne equipment comprises a No. 1 permanent magnet generator, a No. 2 permanent magnet generator, a No. 1 rectifier box, a No. 2 rectifier box, a No. 1 main bus bar, a No. 2 main bus bar, a No. 1 distribution box and a No. 2 distribution box. The No. 1 permanent magnet generator and the No. 2 permanent magnet generator are the same in composition, and output two three-phase alternating currents under the drive of a main reducer and are transmitted to the No. 1 rectifier box and the No. 2 rectifier box respectively. The No. 1 rectifier box and the No. 2 rectifier box are the same in composition, and convert the three-phase alternating current into 29V DC power to supply power to the No. 1 distribution box and the No. 2 distribution box. The No. 1 main bus bar and the No. 2 main bus bar supply power to the No. 1 distribution box and the No. 2 distribution box through fuses respectively. The No. 1 distribution box and the No. 2 distribution box are the same in composition, and supply power to the key electrical equipment after the four DC powers input by the No. 1 rectifier box, the No. 2 rectifier box, the No. 1 main bus bar and the No. 2 main bus bar are isolated in parallel by diodes.

[0006] As a further technical solution of the application, the permanent magnet generator is composed of a No. 1 winding, a No. 2 winding, a magnetic field strengthening winding, a magnetic field weakening winding, a No. 1 isolation diode, a current limiting resistor, a No. 2 isolation diode and a permanent magnet. Permanent magnet is installed on the rotor of the permanent magnet machine, and other components are installed on the stator; when the main reducer rotates, the main reducer drives the rotor of the permanent magnet machine to rotate, the 1# winding and the 2# winding cut the magnetic induction lines to generate induced current, the permanent magnet machine outputs two-way three-phase alternating current and is transmitted to the 1# rectifier box and the 2# rectifier box respectively; The magnetic field strengthening winding and the magnetic field weakening winding are used to strengthen and weaken the magnetic field strength in the permanent magnet machine, so as to control the output voltage of the permanent magnet machine; The 1# isolation diode is used to prevent the current from flowing to the magnetic field strengthening winding when the magnetic field weakening winding is powered on, and the 2# isolation diode is used to prevent the current from flowing to the magnetic field weakening winding when the magnetic field strengthening winding is powered on; The current limiting resistor is used to limit the current passing through the magnetic field strengthening winding and the magnetic field weakening winding, and is connected to the ground through the current limiting resistor.

[0007] As a further technical solution of the application: when the engine is just started and the main reducer has a low speed, the rectifier box supplies power to the magnetic field strengthening winding, strengthens the magnetic field strength in the permanent magnet machine, and thus increases the output voltage of the permanent magnet machine; When the engine enters the stable state of the car and the main reducer has a high speed, the rectifier box supplies power to the magnetic field weakening winding, weakens the magnetic field strength in the permanent magnet machine, and thus reduces the output voltage of the permanent magnet machine.

[0008] As a further technical solution of the application: the rectifier box is composed of a 1# transformer, a 2# transformer, a bus bar, a 1# fuse, a 2# fuse, a control unit, a 1# rectifier filter circuit and a 2# rectifier filter circuit; The transformer transforms the three-phase alternating current voltage input by the permanent magnet machine, and outputs 29V direct current through the rectifier filter circuit; The bus bar integrates the direct current output by the two rectifier filter circuits, and supplies power to the two distribution boxes through the fuses; The fuse is used to protect the distribution box and the connection line from short circuit, and to disconnect the rectifier box to avoid affecting the normal work of the rectifier box and the other output; The control unit is used to control the voltage modulation duty cycle of the rectifier filter circuit and the power supply current of the magnetic field strengthening winding and the magnetic field weakening winding of the permanent magnet machine.

[0009] As a further technical solution of the application: the 1# main bus bar and the 2# main bus bar are supplied by a main direct current power supply and a battery pack in parallel; when the main direct current power supply works normally, the 1# main bus bar and the 2# main bus bar are supplied by the main direct current power supply, and the voltage is 28V; when the main direct current power supply fails, the 1# main bus bar and the 2# main bus bar are supplied by the battery pack, and the voltage is 24V.

[0010] As a further technical scheme of the present application: 1# main busbar supplies power to 1# distribution box and 2# distribution box through two fuses respectively, and 2# main busbar supplies power to 1# distribution box and 2# distribution box through two fuses respectively.

[0011] As a further technical scheme of the present application: the distribution box mainly comprises 1# isolation diode, 2# isolation diode, 3# isolation diode, 4# isolation diode, busbar, 1# fuse, 2# fuse, solid-state power controller, small storage battery group and storage battery group contactor. The four isolation diodes are used for isolating four-way input to avoid mutual influence. The busbar is used for synthesizing four-way input direct current, and the fuses and the solid-state power controller are used for supplying power externally. The fuses are used for protecting the electric equipment and the connection line in case of short circuit, disconnecting the electric equipment and the distribution box, and avoiding affecting the power supply of other electric equipment. The solid-state power controller is used for supplying power to the electric equipment and collecting power supply current and voltage information. The small storage battery group is used for supplying power to the electric equipment in case of disconnection of all four-way external inputs. The storage battery group contactor is used for controlling the connection and disconnection of the small storage battery group and the busbar.

[0012] As a further technical scheme of the present application: when at least one permanent magnet machine and one rectifier box are normally working, the electric equipment is provided with 29V voltage by the rectifier box. When two rectifier boxes or permanent magnet machines are both faulty, the electric equipment is provided with 28V voltage by the main direct current power supply. When two rectifier boxes or permanent magnet machines and the main direct current power supply are all faulty, the electric equipment is provided with 24V voltage by the main machine storage battery group. When the four-way input of the distribution box is disconnected due to power conversion interruption or other conditions, the electric equipment is provided with 22.8V voltage by the small storage battery group in the distribution box.

[0013] In summary, the beneficial effects of the present application are as follows: 1. The permanent magnet machine of the present application adopts a double-winding cross form to supply power to the rectifier box, and the rectifier box adopts a double-transformer, double-rectification isolation filter circuit for voltage conversion, which greatly improves the reliability of the special power supply composed of the permanent magnet machine and the rectifier box.

[0014] 2. The permanent magnet machine of the present application has a magnetic field strengthening and weakening control function, which can make the permanent magnet machine work normally in a wide speed range of the main reducer, and improve the availability of the permanent magnet machine.

[0015] 3、The power distribution box adopts two output modes of fuse and solid-state power controller, and utilizes the advantages of simple and reliable fuse and small weight and volume of solid-state power controller, so that high reliable power supply can be provided for multiple electric equipment in limited weight and volume range.

[0016] 4、The power distribution box is provided with built-in small-sized battery pack, so that multiple electric equipment can be temporarily powered during interruption of 4-way input power supply, and the weight of electric equipment is reduced.

[0017] 5、The power distribution box is powered by two sets of main power supply and two sets of special power supply in parallel, and then multiple power supply is outputted, so that the reliability of electric equipment power supply can be greatly ensured.

[0018] The application will be further described in detail in combination with the accompanying drawings of the embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a framework diagram of the high reliable airborne equipment special DC power supply system. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the application clearer, the technical scheme of the embodiments of the application will be described in more detail in combination with the accompanying drawings of the embodiments of the application.

[0021] In the drawings, the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The described embodiments are part of the embodiments of the application, not all of the embodiments.

[0022] The embodiments described below with reference to the drawings are exemplary and are intended to explain the application, and cannot be understood as a limitation of the application. All other embodiments obtained by those skilled in the art based on the embodiments in the application without creative labor are within the protection scope of the application.

[0023] The application will be described in detail below in combination with the accompanying drawings. Figure 1 The embodiments of the application will be described in detail.

[0024] Embodiment 1 The application discloses a high reliable airborne equipment special DC power supply system, which mainly comprises a first permanent magnet machine 1, a second permanent magnet machine 2, a first rectifier box 3, a second rectifier box 4, a first main bus bar 5, a second main bus bar 6, a first power distribution box 7, a second power distribution box 8 and electric equipment 9.

[0025] 1# permanent magnet machine is mainly composed of 1# winding 10, 2# winding 11, magnetic field strengthening winding 12, magnetic field weakening winding 13, 1# isolation diode 14, current limiting resistor 15, 2# isolation diode 16, permanent magnet 17. 1# permanent magnet machine and 2# permanent magnet machine are the same, and are installed on the main reducer. The permanent magnet is installed on the rotor, and the other components are installed on the stator. When the main reducer rotates, the main reducer drives the permanent magnet rotor to rotate, the 1# winding and the 2# winding cut the magnetic induction lines to generate induced current, and the permanent magnet outputs two-way three-phase alternating current and transmits to the 1# rectifier box and the 2# rectifier box. The magnetic field strengthening winding and the magnetic field weakening winding are used to strengthen and weaken the magnetic field strength inside the permanent magnet, so as to control the output voltage of the permanent magnet. The 1# isolation diode is used to prevent the current from flowing to the magnetic field strengthening winding when the magnetic field weakening winding is powered on, and the 2# isolation diode is used to prevent the current from flowing to the magnetic field weakening winding when the magnetic field strengthening winding is powered on. The current limiting resistor is used to limit the current passing through the magnetic field strengthening winding and the magnetic field weakening winding, and is grounded through the current limiting resistor.

[0026] 1# rectifier box is mainly composed of 1# transformer 30, 2# transformer 31, bus bar 32, 1# fuse 33, 2# fuse 34, control unit 35, 1# rectifier filter circuit 36, 2# rectifier filter circuit 37. 1# rectifier box and 2# rectifier box are the same, which converts the three-phase alternating current input by 1# permanent magnet and 2# permanent magnet into 29V direct current, and supplies power to 1# distribution box and 2# distribution box. The transformer transforms the three-phase alternating current voltage input by the permanent magnet, and outputs 29V direct current stably through the rectifier filter circuit. The bus bar integrates the direct current output by the two rectifier filter circuits, and supplies power to the two distribution boxes through the fuses. The fuse is used to protect the distribution box and the connection line when short-circuiting, and is disconnected from the rectifier box to avoid affecting the normal work of the rectifier box and the other output. The control unit is used to control the voltage modulation duty cycle of the rectifier filter circuit and the power supply current of the magnetic field strengthening winding and the magnetic field weakening winding of the permanent magnet.

[0027] 1# main bus bar and 2# main bus bar are supplied by the main direct current power supply and the battery pack in parallel. When the main direct current power supply works normally, 1# main bus bar and 2# main bus bar are supplied by the main direct current power supply, and the voltage is 28V; when the main direct current power supply fails, 1# main bus bar and 2# main bus bar are supplied by the battery pack, and the voltage is 24V. 1# main bus bar supplies power to 1# distribution box and 2# distribution box through fuse 50 and fuse 51 respectively, and 2# main bus bar supplies power to 1# distribution box and 2# distribution box through fuse 61 and fuse 60 respectively.

[0028] 1# distribution box is mainly composed of 1# isolation diode 70, 2# isolation diode 71, 3# isolation diode 72, 4# isolation diode 73, bus bar 74, 1# fuse 75, 2# fuse 76, solid-state power controller 77, small storage battery group 78, storage battery group contactor 79. 1# distribution box and 2# distribution box are the same. The distribution box is connected with 1# rectifier box, 2# rectifier box, 1# main bus bar and 2# main bus bar. Four-way DC input of the distribution box is isolated in parallel through diode, and then powers the key electrical equipment. Four isolation diodes are used to isolate four-way input to avoid mutual influence. The bus bar is used to integrate four-way input DC power, and the fuse and the solid-state power controller are used to supply power externally. The fuse is used to protect the electrical equipment and the connection line from short circuit, and to disconnect the electrical equipment and the distribution box to avoid affecting the power supply of other electrical equipment. The solid-state power controller is used to supply power to the electrical equipment and collect power supply current, voltage and other information. The small storage battery group is used to supply power to the electrical equipment in emergency when all four-way external inputs are disconnected. The storage battery group contactor is used to control the connection and disconnection of the small storage battery group and the bus bar.

[0029] When at least one permanent magnet machine and one rectifier box are working normally, the electrical equipment is supplied with 29V voltage by the rectifier box. When two rectifier boxes or permanent magnet machines are both faulty, the electrical equipment is supplied with 28V voltage by the main DC power supply. When two rectifier boxes or permanent magnet machines and the main DC power supply are all faulty, the electrical equipment is supplied with 24V voltage by the storage battery group. When the four-way input of the distribution box is disconnected due to power conversion interruption or other conditions, the electrical equipment is supplied with 22.8V voltage by the small storage battery group in the distribution box.

[0030] Key points of the application 1. The permanent magnet machine is used as a special power supply for electrical equipment, which has simple structure and high reliability. The double-winding permanent magnet machine is used to supply power to the rectifier box, and the double transformer and double rectifier filter circuit are used for isolation voltage conversion, which further improves the reliability of the special power supply.

[0031] 2. The control unit in the rectifier box supplies power to the magnetic field strengthening winding and the magnetic field weakening winding of the permanent magnet machine, which can control the magnetic field strength when the main reducer is in the low speed range and the high speed range respectively, so as to ensure that the output voltage of the permanent magnet machine can meet the use requirements in the wide speed range of the main reducer, and further improve the availability of the permanent magnet machine in the use scenario.

[0032] 3. Two-way main power supply and two-way special power supply are used to supply power to the distribution box, which improves the reliability of the distribution box to supply power to the electrical equipment. The distribution box uses fuse and solid-state power controller as two output modes, which can effectively prevent common mode failure and further improve the reliability of the distribution box power supply.

[0033] Example 2 The application discloses a high-reliability airborne equipment special DC power supply system, when the aircraft is in the ground parking state, the ground power supply is used to supply power to the whole machine, at this time, the 1# main bus bar and the 2# main bus bar are used to supply power to the 1# distribution box and the 2# distribution box. When the distribution box detects that the voltage of at least one of the four input power supplies is greater than 23V, the built-in small battery pack contactor is turned on, and the built-in small battery pack is in the charging state. When the whole machine is powered by the ground power supply, there is a 50ms power interruption, and the built-in small battery pack is used to supply power to the power-consuming equipment during the power interruption.

[0034] When the aircraft is in the ground parking state, the battery pack is used to supply power to the whole machine, at this time, the 1# main bus bar and the 2# main bus bar are used to supply power to the 1# distribution box and the 2# distribution box. When the distribution box detects that the voltage of at least one of the four input power supplies is greater than 23V, the built-in small battery pack contactor is turned on, and the built-in small battery pack is in the charging state. When the engine is started by the battery pack, the voltage of the 1# main bus bar and the 2# main bus bar will decrease, at this time, the built-in small battery pack is connected in parallel with the 1# main bus bar and the 2# main bus bar to supply power to the power-consuming equipment.

[0035] When the engine starts to start and drives the main reducer to rotate, the rectifier box detects the frequency of the three-phase alternating current input of the permanent magnet machine, and judges the main reducer speed at this time. When the rectifier box judges that the main reducer speed reaches the minimum working speed, the rectifier box control unit supplies power to the magnetic field strengthening winding, cooperates with the permanent magnet to improve the internal magnetic field strength of the permanent magnet machine, so that the voltage of the three-phase alternating current output by the permanent magnet machine is improved. With the increase of the main reducer speed, the rectifier box control unit gradually reduces the magnetic field strengthening winding current, and when the main reducer speed rises to a certain value, the rectifier box control unit stops supplying power to the magnetic field strengthening winding.

[0036] The two-way three-phase alternating current output by the permanent magnet machine is transmitted to two rectifier boxes, and the cross power supply mode of the two permanent magnet machines and the two rectifier boxes can ensure that the two rectifier boxes can work normally when one permanent magnet machine fails, and the two permanent magnet machines can work normally when one rectifier box fails. The rectifier box converts the two-way input three-phase alternating current into 29V direct current through two groups of transformers and two groups of rectifier filter circuits, and is connected in parallel to supply power to the internal bus bar. The bus bar supplies power to the two power distribution boxes through two fuses. When the connection line between the rectifier box and one of the power distribution boxes is short-circuited, the fuse is fused, so that the rectifier box can continue to supply power to the other power distribution box normally. When the speed of the main reducer rises to a certain value, the internal control unit of the rectifier box supplies power to the magnetic field weakening winding of the permanent magnet machine, so as to reduce the magnetic field strength in the permanent magnet machine and thus reduce the three-phase alternating current voltage output by the permanent magnet machine, thereby ensuring the safety of the transformer and the rectifier filter circuit. When the engine is shut down, the speed of the main reducer gradually decreases, the main direct current power supply stops supplying power, and the rectifier box supplies power to the magnetic field strengthening winding again to increase the output voltage of the permanent magnet machine, so as to ensure that the rectifier box continues to output 29V voltage and avoids consuming the battery pack power during the engine shutdown process. The rectifier box supplies power to the magnetic field weakening winding or the magnetic field strengthening winding of the permanent magnet machine only when the speed of the main reducer is extremely high or extremely low.

[0037] When the two permanent magnet machines, rectifier boxes and main bus bars are working normally, the power distribution box isolates the four-way input power from each other through four diodes to prevent mutual influence. A small number of fuses and multiple solid-state power controllers are arranged in the power distribution box to reduce the size and weight of the power distribution box. The solid-state power controller controls the on-off of the output power supply through software. Only the most critical electrical equipment is supplied by the parallel connection of the fuse and the solid-state power controller, so that when the software fails, the solid-state power controller cannot supply power to the electrical equipment, and at this time the fuse can still supply power to the most critical electrical equipment. The general critical electrical equipment is supplied by the multiple solid-state power controllers. When the power distribution box detects that the aircraft is in the air through the wheel load signal, the control built-in small battery contactor is kept in the on state to prevent the four-way input power from being completely cut off in the extreme case, and the small battery pack can provide temporary power for a few minutes to ensure that the unit has time to handle the emergency situation. When the power distribution box detects that the aircraft is on the ground through the wheel load signal and detects that the four-way input power is completely cut off, the power distribution box delays for a few seconds to disconnect the built-in small battery contactor to prevent the small battery pack from discharging in the parked state.

[0038] Thus, the purpose of the present application is achieved.

[0039] The above is only a preferred embodiment of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A highly reliable DC power supply system for airborne equipment, characterized in that, include: Permanent magnet generator #1, permanent magnet generator #2, rectifier box #1, rectifier box #2, main busbar #1, main busbar #2, distribution box #1 and distribution box #2; The No. 1 permanent magnet generator and the No. 2 permanent magnet generator have the same composition. Driven by the main reducer, they output two three-phase AC power supplies, which are then transmitted to the No. 1 rectifier box and the No. 2 rectifier box respectively. Rectifier box #1 and rectifier box #2 have the same composition, converting three-phase AC power into 29V DC power to power distribution boxes #1 and #2. Main busbar #1 and main busbar #2 supply power to distribution box #1 and distribution box #2 respectively via fuses; Distribution box #1 and distribution box #2 have the same composition. The four DC power inputs from rectifier box #1, rectifier box #2, main busbar #1, and main busbar #2 are isolated by diodes and connected in parallel to supply power to critical electrical equipment.

2. The high-reliability airborne equipment dedicated DC power supply system according to claim 1, characterized in that, The permanent magnet generator consists of winding #1, winding #2, magnetic field strengthening winding, magnetic field weakening winding, isolation diode #1, current limiting resistor, isolation diode #2, and permanent magnet; The permanent magnet is installed on the rotor of the permanent magnet machine, while other components are installed on the stator. When the main reducer rotates, it drives the rotor of the permanent magnet machine to rotate. The No. 1 winding and the No. 2 winding cut the magnetic field lines to generate induced current. The permanent magnet machine outputs two three-phase AC power, which is transmitted to the No. 1 rectifier box and the No. 2 rectifier box respectively. The magnetic field strengthening winding and the magnetic field weakening winding are used to enhance or weaken the magnetic field strength inside the permanent magnet motor, thereby controlling the output voltage of the permanent magnet motor. Isolation diode #1 is used to prevent current from flowing to the magnetic field strengthening winding when the magnetic field weakening winding is energized, and isolation diode #2 is used to prevent current from flowing to the magnetic field weakening winding when the magnetic field strengthening winding is energized. The current-limiting resistor is used to limit the current flowing through the magnetic field strengthening winding and the magnetic field weakening winding, and is grounded through the current-limiting resistor.

3. The high-reliability airborne equipment dedicated DC power supply system according to claim 2, characterized in that, When the engine is just started and the main reducer speed is low, the rectifier box supplies power to the magnetic field strengthening winding to enhance the magnetic field strength inside the permanent magnet motor, thereby increasing the output voltage of the permanent magnet motor. When the engine enters a stable state and the main reducer speed is high, the rectifier box supplies power to the magnetic field weakening winding, weakening the magnetic field strength inside the permanent magnet motor, thereby reducing the output voltage of the permanent magnet motor.

4. The high-reliability airborne equipment dedicated DC power supply system according to claim 1, characterized in that, The rectifier box consists of transformer #1, transformer #2, busbar, fuse #1, fuse #2, control unit, rectifier filter circuit #1, and rectifier filter circuit #2. The transformer converts the three-phase AC voltage input to the permanent magnet motor and outputs a stable 29V DC voltage through a rectifier and filter circuit. The busbar combines the DC power output from the two rectifier and filter circuits and supplies power to the two distribution boxes respectively through fuses; The fuse is used to protect the distribution box and connecting lines from short circuits, disconnecting it from the rectifier box to avoid affecting the normal operation of the rectifier box and the other output; The control unit is used to control the voltage modulation duty cycle of the rectifier filter circuit and the power supply current of the permanent magnet motor's magnetic field strengthening winding and magnetic field weakening winding.

5. The high-reliability airborne equipment dedicated DC power supply system according to claim 1, characterized in that, Main bus bar #1 and main bus bar #2 are powered by the main DC power supply and the battery pack in parallel. When the main DC power supply is working normally, main bus bar #1 and main bus bar #2 are powered by the main DC power supply at a voltage of 28V. When the main DC power supply fails, main bus bar #1 and main bus bar #2 are powered by the battery pack at a voltage of 24V.

6. The high-reliability airborne equipment dedicated DC power supply system according to claim 5, characterized in that, Main busbar #1 supplies power to distribution boxes #1 and #2 respectively through two fuses, and main busbar #2 supplies power to distribution boxes #1 and #2 respectively through two fuses.

7. The high-reliability airborne equipment dedicated DC power supply system according to claim 1, characterized in that, The distribution box mainly consists of isolation diode #1, isolation diode #2, isolation diode #3, isolation diode #4, busbar, fuse #1, fuse #2, solid-state power controller, small battery pack, and battery pack contactor; Four isolation diodes are used to isolate the four inputs to prevent them from interfering with each other; The busbar is used to integrate the four input DC power supplies and supply power to the outside through fuses and solid-state power controllers; A fuse is used to protect electrical equipment and its wiring from short circuits by disconnecting the equipment from the distribution box to prevent power outages to other equipment. Solid-state power controllers are used to supply power to electrical equipment and collect information on supply current and voltage. A small battery pack is used to provide emergency power to electrical equipment when all four external inputs are disconnected. The battery pack contactor is used to control the connection and disconnection of the small battery pack and the busbar.

8. The high-reliability airborne equipment dedicated DC power supply system according to claim 1, characterized in that, When at least one permanent magnet generator and one rectifier box are working normally, the electrical equipment is supplied with 29V voltage by the rectifier box; When both rectifier boxes or permanent magnet generators fail, the electrical equipment is supplied with 28V voltage by the main DC power supply. When both rectifier boxes or permanent magnet generators and the main DC power supply fail, the electrical equipment is supplied with 24V voltage by the main unit's battery pack. When all four inputs of the distribution box are disconnected due to power conversion interruption or other reasons, the electrical equipment is supplied with 22.8V voltage by the small battery pack built into the distribution box.

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