270V high-power power converter for steering engine of unmanned aerial vehicle

Abstract

The utility model discloses a 270V high-power power converter for a steering engine of an unmanned aerial vehicle, which comprises a metal cavity 1, and a cooling fan is mounted on the metal cavity 1. A control board, a protection board, a voltage conversion board and a mounting bottom board are detachably mounted on the base; the control board and the protection board are installed on the voltage conversion board. The mounting bottom plate comprises a socket RS422 / CAN, a 28V input binding post, a 270V output binding post and a metal cavity 2; the control board comprises an auxiliary power supply circuit, a control circuit and a signal driving circuit; the protection board comprises a current sharing circuit and a protection circuit. The voltage conversion board comprises an input filter circuit, a voltage conversion circuit, a rectification circuit and an output filter circuit.

Description

Technical Field

[0001] The utility model relates to the technical field of unmanned aerial vehicle (UAV) airborne power supply, and more specifically to a 270V high-power power converter for a UAV steering gear. Background Art

[0002] With the rapid development of UAVs, most loads on small and medium-sized UAVs are powered by 28V power supply, so the aircraft is only equipped with a 28V DC generator. However, some high-power loads are powered by 270V power supply to reduce the weight of the aircraft. Due to the limited space and weight of small and medium-sized aircraft, it is impossible to equip these loads with 270V DC generators. Therefore, 270V high-power power converters can save space for small and medium-sized UAVs, reduce weight, and improve aircraft reliability.

[0003] The utility model provides a 270V high-power power converter for a UAV steering gear. Utility Model Content

[0004] The purpose of the utility model is to provide a 270V high-power power converter for a UAV servo, in order to solve the technical problems in the background technology.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A 270V high-power power converter for a UAV steering gear comprises a metal cavity 1, a heat dissipation fan is installed on the metal cavity 1; a control board, a protection board, a voltage conversion board, and a mounting bottom board are detachably installed; the control board and the protection board are installed on the voltage conversion board;

[0007] The installation base plate includes a socket RS422 / CAN, a 28V input terminal, a 270V output terminal, and a metal cavity 2; the control board includes an auxiliary power supply circuit, a control circuit, and a signal drive circuit; the protection board includes a current equalization circuit and a protection circuit; the voltage conversion board includes an input filter circuit, a voltage conversion circuit, a rectifier circuit, and an output filter circuit.

[0008] In some embodiments, the input filter circuit, voltage conversion circuit, rectification circuit, and output filter circuit are integrated in an independent metal cavity, and the heat loss generated by the operation of all circuits is conducted to the metal cavity and dissipated by forced air cooling by a fan; the metal cavity is composed of a metal cavity 1 and a metal cavity 2.

[0009] In some embodiments, the auxiliary power supply circuit provides power supply for the control circuit, protection circuit and current equalization circuit; the voltage conversion circuit adopts a dual push-pull circuit topology; the control circuit is used to control the operation of the voltage conversion circuit; the rectifier circuit and output filter circuit rectify and filter the AC voltage output by the voltage conversion circuit into a stable DC 270V voltage.

[0010] In some embodiments, the input filter circuit provides input voltage spike and surge suppression for the power converter, thereby achieving the functions of energy storage and input voltage fluctuation suppression.

[0011] In some embodiments, the input filter circuit and the output filter circuit are fixed and heat-dissipated by potting them in a metal cavity with thermal conductive glue and using a fan to force air cooling to dissipate heat.

[0012] In some embodiments, the auxiliary power supply circuit is powered by an input 28V power supply to power the control circuit and the protection circuit.

[0013] In some embodiments, the signal driving circuit is composed of a totem pole circuit composed of NPN+PNP transistors, and the PWM control signal is amplified through the totem pole circuit to achieve driving current amplification and converted into a pulse signal with load capacity to control the opening and closing of the semiconductor power device.

[0014] In some embodiments, the voltage conversion circuit includes a planar transformer and a semiconductor power device. The step-up ratio of the planar transformer is 1:14. Each push-pull circuit uses three semiconductor power devices connected in parallel to work with equal current.

[0015] Compared with the prior art, the utility model has the following technical effects:

[0016] The purpose of the utility model is to provide a 270V high-power power converter for UAV servos. By adopting planar transformer technology, multiple semiconductor power devices parallel current sharing technology, and integrated modular design technology, the efficiency of the power converter is improved and the weight of the whole machine is reduced. At the same time, according to the characteristics of the servo power supply, the converter overcurrent protection adopts a constant current working mode to ensure that the servo is not disconnected under extreme conditions, thereby improving the reliability of the aircraft and solving the problem that small and medium-sized UAVs are not equipped with 270V DC generators. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the utility model;

[0018] Figure 2 This is a principle block diagram of the utility model;

[0019] Figure 3 It is a schematic diagram of the utility model.

[0020] Among them, 1-270V output terminal, 2-rectifier circuit, 3-output filter circuit, 4-cooling fan, 5-metal cavity 1, 6-input filter circuit, 7-auxiliary power supply circuit, 8-control circuit, 9-28V power input terminal, 10-signal drive circuit, 11-metal cavity 2, 12-voltage conversion circuit, 13-current sharing circuit, 14-protection circuit, 15-control board, 16-protection board, 17-voltage conversion board, 18-RS422 / CAN. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below in conjunction with the drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals throughout represent the same or similar parts or parts with the same or similar functions. The described embodiments are part of the embodiments of the present application, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0022] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0023] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0024] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are orientations or positional relationships based on the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0025] In addition, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product, or display that includes a series of steps or elements is not necessarily limited to those steps or elements explicitly listed but may include other steps or elements not explicitly listed or inherent to such process, method, product, or display.

[0026] The following will be combined Figure 1-Figure 3 , a 270V high-power power converter for a drone servo involved in the embodiment of the present application is described in detail. It is worth noting that the following embodiments are only used to explain the present application and do not constitute a limitation on the present application.

[0027] Embodiment 1:

[0028] See also Figure 1-Figure 3 A 270V high-power power converter for a UAV steering gear comprises a metal cavity 15, a heat dissipation fan 4 is installed on the metal cavity 15; a control board, a protection board, a voltage conversion board, and a mounting bottom board are detachably installed; the control board and the protection board are installed on the voltage conversion board;

[0029] The installation base plate includes a socket RS422 / CAN voltage conversion board, 18, 28V input terminals, 270V output terminals 1, and a metal cavity 211; the control board includes an auxiliary power supply circuit 7, a control circuit 8, and a signal drive circuit 10; the protection board includes a current equalization circuit 13 and a protection circuit; the voltage conversion board includes an input filter circuit 6, a voltage conversion circuit 12, a rectifier circuit 2, and an output filter circuit 3.

[0030] The input filter circuit 6, the voltage conversion circuit 12, the rectifier circuit 2, and the output filter circuit 3 are integrated in an independent metal cavity. The heat consumption generated by the operation of all circuits is conducted to the metal cavity, and the heat is dissipated by forced air cooling by a fan; the metal cavity is composed of a metal cavity 15 and a metal cavity 211. The input filter circuit and the voltage conversion circuit are fixed and heat-dissipated by encapsulating them in the metal cavity with thermal conductive glue; planar transformers, semiconductor power devices, etc. with high heat generation are closely contacted with the metal cavity by laminating and pressing, and thermal conductive silicone grease is applied between the cavity and the device to facilitate heat conduction to the metal cavity, and heat is dissipated by forced air cooling by a fan;

[0031] The input 28V inputs electric energy into the product through the 28V input terminal 9, and is connected to the voltage conversion board 17 through the bus bar; the 270V output voltage of the voltage conversion board 17 is connected to the 270V output terminal 1 through a wire, and the 270V voltage is output to each steering gear on the aircraft to provide electric energy for the steering gear; the input filter circuit 6 is welded on the voltage conversion board 17, which plays a role in suppressing input voltage fluctuations and storing energy.

[0032] The voltage conversion board 17 is designed with a bus bar, which is responsible for transmitting energy to the voltage converter; the auxiliary power supply circuit 7, the control circuit 8, and the signal drive circuit 10 constitute the control board 15, which is fixed on the voltage conversion board 17 through four hexagonal prisms. The auxiliary power supply circuit 7 is responsible for the generation of auxiliary power (+12V, +5V, +3.3V), and the control circuit 8 generates a PWM control signal, which is sent to the signal drive circuit 10 and converted into a pulse signal with a large load capacity to control the opening and closing of the high-power semiconductor power devices in the voltage conversion circuit 12.

[0033] The current balancing circuit 13 and the protection circuit 14 constitute a protection board 16, which is fixed on the voltage conversion board 17 through four hexagonal prisms. The protection circuit 14 is responsible for collecting information such as input and output voltage and current, converter operating temperature, fan working status, etc., and can be output to the flight control computer through the RS422 / CAN18 socket, while realizing input reverse polarity, input overvoltage, and input undervoltage protection functions.

[0034] The current-sharing circuit 13 can connect multiple power converters in parallel to achieve power superposition; the voltage conversion circuit 12 is composed of planar transformers, semiconductor power devices and other components. The step-up ratio of the planar transformer is 1:14, which ensures that the output power requirement of 3KW (270V) is met within the voltage range of 22-29V; the semiconductor power devices adopt parallel current-sharing working mode to ensure that the temperature rise and power meet the product requirements under full power conditions; the input filter 6 and the output filter circuit 3 are fixed and heat-dissipated by using thermal conductive glue to be potted in the metal cavity 5. The topology of the dual push-pull circuit is adopted, and each push-pull circuit uses 3 semiconductor power devices to work in parallel with current-sharing to ensure that the temperature rise and power meet the product requirements under full power conditions;

[0035] The control circuit is composed of a single-chip PWM pulse width modulation chip, which can output a control signal with adjustable pulse width according to the load size. The control circuit is designed with soft start and constant voltage functions, and controls the switching of semiconductor power devices by outputting PWM control signals to achieve a stable output of 270V voltage;

[0036] The signal driving circuit is composed of a totem pole circuit composed of NPN+PNP transistors. The PWM control signal is amplified through the totem pole circuit to realize the driving current amplification and converted into a pulse signal with load capacity to control the opening and closing of the semiconductor power device to ensure the conversion efficiency of the power converter.

[0037] The ARM microcontroller in the protection circuit is only responsible for collecting information such as input and output voltage and current, converter operating temperature, fan working status, etc., which can be uploaded to the flight control computer through the RS422 bus or CAN bus, and at the same time realize input reverse polarity, input overvoltage, and input undervoltage protection functions;

[0038] The planar transformer, semiconductor power devices and rectifier tubes in the rectifier circuit 2 included in the voltage conversion circuit 12 have high heat generation and are in close contact with the metal cavity 5 by bonding and crimping. Thermal grease is applied between the cavity and the devices to facilitate heat conduction to the metal cavity, and the heat is dissipated by forced air cooling through the fan 4.

[0039] The above description is only a preferred embodiment of the present invention and is used to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A 270V high-power power converter for drone steering gear, characterized by: It comprises a metal cavity 1, on which a heat dissipation fan is installed; a control board, a protection board, a voltage conversion board, and a mounting bottom board are detachably installed; the control board and the protection board are installed on the voltage conversion board; The installation base plate includes a socket RS422 / CAN, a 28V input terminal, a 270V output terminal, and a metal cavity 2; the control board includes an auxiliary power supply circuit, a control circuit, and a signal drive circuit; the protection board includes a current equalization circuit and a protection circuit; the voltage conversion board includes an input filter circuit, a voltage conversion circuit, a rectifier circuit, and an output filter circuit.

2. The 270V high-power power converter for a UAV steering gear according to claim 1 is characterized in that: The input filter circuit, voltage conversion circuit, rectification circuit and output filter circuit are integrated in an independent metal cavity. The heat loss generated by the operation of all circuits is conducted to the metal cavity and the heat is dissipated by forced air cooling by a fan. The metal cavity is composed of metal cavity 1 and metal cavity 2.

3. The 270V high-power power converter for a UAV steering gear according to claim 1 is characterized in that: The auxiliary power supply circuit provides power supply for the control circuit, protection circuit and current equalization circuit; the voltage conversion circuit adopts a dual push-pull circuit topology; the control circuit is used to control the operation of the voltage conversion circuit; the rectifier circuit and output filter circuit rectify and filter the AC voltage output by the voltage conversion circuit into a stable DC 270V voltage.

4. The 270V high-power power converter for a UAV steering gear according to claim 1 is characterized in that: The input filter circuit provides input voltage peak and surge suppression for the power converter, thereby achieving the functions of energy storage and input voltage fluctuation suppression.

5. The 270V high-power power converter for a UAV steering gear according to claim 1 is characterized in that: The input filter circuit and the output filter circuit are fixed and heat-dissipated by encapsulating them in a metal cavity with thermal conductive glue and using a fan to force air cooling for heat dissipation.

6. The 270V high-power power converter for a UAV steering gear according to claim 1 is characterized in that: The auxiliary power supply circuit is powered by an input 28V power supply and supplies power to the control circuit and the protection circuit.

7. The 270V high-power power converter for a UAV steering gear according to claim 1 is characterized in that: The signal driving circuit is composed of a totem pole circuit composed of NPN+PNP transistors. The PWM control signal is amplified by the totem pole circuit to realize driving current amplification and is converted into a pulse signal with load carrying capacity to control the opening and closing of the semiconductor power device.

8. The 270V high-power power converter for a UAV steering gear according to claim 1 is characterized in that: The voltage conversion circuit comprises a planar transformer and a semiconductor power device. The voltage step-up ratio of the planar transformer is 1:

14. Each push-pull circuit uses three semiconductor power devices connected in parallel to work with current sharing.

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