Airborne power supply conversion architecture and device based on high integration level and capable of being expanded in parallel

Abstract

The invention provides a high-integration-level-based airborne power supply conversion architecture and device capable of being expanded in parallel, relates to the field of aviation airborne power supply, and solves the problem of how to meet the high-power expansion requirement of a high-integration-level-oriented power supply conversion device. The architecture is applied to an airborne power supply module, electric energy is input through a front-end preprocessing unit, sequentially passes through an input filtering unit, a voltage conversion unit and an output filtering unit, and then is output as converted electric energy by an output post-processing unit; the front-end preprocessing unit is used for performing input short-circuit protection, reversed polarity protection and surge current suppression operation on the electric energy; the input filtering unit carries out input EMI filtering operation on the electric energy; the voltage conversion unit converts the voltage of the input electric energy into the voltage of the output electric energy; the output filtering unit reduces output ripple interference of electric energy; the output post-processing unit performs output anti-backflow and output parallel current sharing operations on the electric energy; according to the invention, the high-power expansion requirement of universality is smoothly met.

Description

Technical Field

[0001] The present invention relates to the field of aviation airborne power supply and is applied to a power supply conversion device, and in particular to an airborne power supply conversion architecture and device based on high integration and parallel expansion. Background Art

[0002] With the continuous development of the aviation industry, the concept of all-electric aircraft and more-electric aircraft has gradually become the trend of future aircraft design, which has achieved higher efficiency, lower maintenance costs and more environmentally friendly operating performance. This transformation has led to a significant increase in the number of onboard electrical equipment, which in turn has put forward higher requirements on the power supply capacity of the aircraft power system.

[0003] In this context, in order to adapt to the growing demand for electricity, while taking into account the limitations of aircraft interior space and strict weight control standards, it is particularly important to develop a power conversion module with high power density and compact size. This module not only needs to have high energy conversion efficiency, but also needs to be able to integrate multiple functions and provide sufficient output power in a limited space to support the needs of various onboard electrical systems. However, the power conversion products currently on the market often find it difficult to simultaneously meet the requirements of miniaturization, lightweight and high performance, which poses a considerable challenge to aircraft designers.

[0004] In order to solve the above problems, a feasible method is to use multiple standardized power conversion units to work in parallel to expand the overall output power. In theory, this method can flexibly adjust the number of units used according to actual load requirements, thereby effectively improving the capacity of the entire power supply system. However, in practice, it is found that there are large differences between DC-DC converters produced by different manufacturers, especially in terms of how to ensure balanced current distribution between units when running in parallel. There is a lack of unified and effective solutions. Most of the existing current sharing strategies are optimized based on specific models of products and lack wide applicability, which means that when trying to combine DC-DC converters from different suppliers, it is difficult to ensure that they can work together stably and reliably to achieve the desired effect.

[0005] In view of this situation, how to meet the high-power expansion requirements for highly integrated power conversion devices has become a research focus of technical personnel in this field. Summary of the invention

[0006] The purpose of the present invention is to solve the problem of how to meet the high-power expansion requirements of a highly integrated power conversion device under limited space and weight constraints, and therefore proposes an airborne power conversion architecture and device based on high integration and parallel expansion. The present invention can provide a multifunctional high-integration solution and successfully solve the universal high-power expansion requirements through an adaptive parallel current sharing strategy.

[0007] The present invention adopts the following technical solutions to achieve the purpose:

[0008] A highly integrated and parallel expandable airborne power conversion architecture is applied to an airborne power module and comprises a front-end preprocessing unit, an input filter unit, a voltage conversion unit, an output filter unit and an output post-processing unit. Electric energy is input through the front-end preprocessing unit, passes through the input filter unit, the voltage conversion unit and the output filter unit in sequence, and is output as converted electric energy by the output post-processing unit; the front-end preprocessing unit is used for performing input short-circuit protection, reverse polarity protection and surge current suppression operations on the electric energy; the input filter unit is used for performing input EMI filtering operations on the electric energy; the voltage conversion unit is used for converting the voltage of the input electric energy into the voltage of the output electric energy; the output filter unit is used for reducing the output ripple interference of the electric energy; and the output post-processing unit is used for performing output backflow protection and output parallel current sharing operations on the electric energy.

[0009] Furthermore, the front-end preprocessing unit is used to perform input short-circuit protection operation on the electric energy. When the input electric energy is in an overcurrent or short-circuit state, the corresponding fuse is blown to protect the subsequent other units;

[0010] The front-end preprocessing unit is used to reverse the polarity of the electric energy. When the positive and negative poles of the input electric energy are reversed, the electric energy path is cut off to protect other subsequent units.

[0011] The front-end preprocessing unit is used to perform surge current suppression operation on electric energy. At the moment of electric energy input, the generated surge current is suppressed within a preset range, thereby being compatible with the power module of the previous stage.

[0012] Specifically, the input filter unit is used to suppress the common mode and differential mode interference of the input power through the input EMI filtering operation, so as to meet the electromagnetic compatibility requirements;

[0013] The output filter unit is used to reduce the output ripple interference of the voltage in the DC output power by connecting a capacitor with an equivalent impedance lower than a preset threshold in parallel at the output end of the DC-DC converter according to the current of the power at the output end of the DC-DC converter in the voltage conversion unit.

[0014] Specifically, the voltage conversion unit is used to realize the process of converting the voltage of input electric energy into the voltage of output electric energy through a DC-DC converter, including sub-process one of converting input 270V DC electric energy into output 12V DC electric energy one, and sub-process two of converting input 28V DC electric energy into output 12V DC electric energy two in parallel with sub-process one.

[0015] Furthermore, the output post-processing unit is used to perform an output anti-backflow operation on the electric energy, by connecting an ideal diode in series at the output end of the DC-DC converter of the voltage conversion unit to prevent the electric energy voltage of the subsequent power supply module from backflowing to the DC-DC converter;

[0016] The output post-processing unit is used to perform parallel current sharing operations on the output electric energy. According to the demand for onboard power resources, expansion and upgrading can be achieved by connecting power modules of the same architecture through a current sharing bus.

[0017] Preferably, the architecture also includes a health management unit, a power-on control unit and an auxiliary power supply unit; the health management unit is used to monitor the voltage, current and temperature of the electric energy; the power-on control unit is used to input the distribution control of power-on control instructions and health management unit instructions; the auxiliary power supply unit is used to provide separate power supply for the health management unit and the power-on control unit.

[0018] Specifically, the health management unit is used to monitor the input voltage, input current, output voltage and output current in the electric energy in real time;

[0019] The health management unit is used to monitor the temperature of the DC-DC converter of the voltage conversion unit and the corresponding various heating devices in real time;

[0020] The health management unit is used to report the real-time monitored input voltage, input current, output voltage, output current and temperature to the external system through the CAN bus.

[0021] Specifically, the power-on control unit is used to distribute the corresponding input power-on control instruction into two independent power-on control signals according to the preset input power-on control logic, so as to control the power-on and power-off process of the subsequent power supply module;

[0022] The power-on control unit is used to distribute the preset instructions into two independent power-on control signals after the health management unit receives and generates preset instructions through the CAN bus, thereby controlling the power-on and power-off process of the subsequent power supply module.

[0023] Specifically, the auxiliary power supply unit is used to provide separate working power for the MCU and multiple types of interface chips in the health management unit; the auxiliary power supply unit is used to provide separate working power for multiple types of components in the power-on control unit.

[0024] The present invention also provides an onboard power conversion device based on high integration and expandable in parallel, the device is composed of a plurality of onboard power modules having the above-mentioned onboard power conversion architecture based on high integration and expandable in parallel.

[0025] In summary, due to the adoption of this technical solution, the beneficial effects of the present invention are as follows:

[0026] The present invention has the characteristics of high integration and miniaturization. The technical architecture of the present invention highly integrates multiple functional units such as front-end and back-end processing, input and output filtering, voltage conversion, health management, auxiliary power supply and power-on control into a module architecture, and compresses the physical size and improves the power density through a highly integrated design.

[0027] The present invention provides a standardized architecture and flexible configuration capability of functional units. The technical architecture of the present invention adopts a distributed power supply architecture, the intermediate power supply bus voltage design is normalized, and the flexible configuration scheme of each functional unit is determined by extracting standardized functional circuits and hierarchical constraints of design specifications, so as to meet the power supply conversion, power supply control, power supply compatibility and electromagnetic compatibility requirements of various airborne platforms, form a standardized power supply architecture, shorten the demonstration, development and research cycle of power supply design, and reduce the failure rate of power supply equipment.

[0028] The present invention can provide an adaptive active parallel current balancing strategy. The technical architecture of the present invention studies various current balancing methods such as the natural droop method, bus current balancing method and master-slave setting method of DC-DC converters, and finally normalizes the current balancing strategy based on the average current method into a universal adaptive active parallel current balancing method, thereby forming a standardized architecture circuit. In view of the problem of mismatched current balancing strategies of different DC-DC converters, the present invention can use an integrated current balancing chip to achieve a high-precision adaptive current balancing effect.

[0029] The present invention can provide universal expansion configuration capability for high-power occasions. The technical architecture of the present invention can realize universal parallel expansion solutions for high-power output applications through highly integrated standardized modules and adaptive active parallel current sharing technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a schematic diagram of an onboard power conversion architecture of the present invention;

[0031] Figure 2 It is a schematic diagram of the universal expansion configuration of the present invention in high-power occasions. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] First, an overview of the relevant contents of the specific implementation of the present invention is given. Those skilled in the art believe that it is necessary to achieve high integration of multifunctional unit modules in limited size and physical space, so it is necessary to provide standardized circuits for each functional unit. Based on a highly integrated power conversion architecture, it is necessary to have universal expansion configuration capabilities for adaptive high-power output occasions to meet the high-power usage scenarios of future multi-electric and all-electric aircraft.

[0035] Therefore, the embodiment of the present invention constructs and designs an airborne power supply conversion architecture based on high integration and parallel expansion, which can be used for application scenarios with high integration requirements, miniaturization trends and parallel expansion of power-related products, and provides power supply conversion resources for the standardized and normalized design of each functional unit circuit and the adaptive output parallel current sharing function, thereby achieving high integration and high-power expansion of the airborne power supply.

[0036] The overall construction design of the embodiment of the present invention is as follows: the airborne power supply conversion architecture includes a front-end preprocessing unit, an input filter unit, a voltage conversion unit, an output filter unit and an output post-processing unit. The electric energy is input through the front-end preprocessing unit, and after passing through the input filter unit, the voltage conversion unit and the output filter unit in sequence, the electric energy is output by the output post-processing unit as converted electric energy. In addition, as a preferred embodiment, the architecture also includes a health management unit, a power-on control unit and an auxiliary power supply unit.

[0037] Combination Figure 1 The various units in the embodiment of the present invention are briefly introduced as follows:

[0038] The front-end preprocessing unit is used to perform input short-circuit protection, reverse polarity protection and surge current suppression operations on the electric energy; the input filtering unit is used to perform input EMI filtering operations on the electric energy; the voltage conversion unit is used to convert the voltage of the input electric energy into the voltage of the output electric energy; the output filtering unit is used to reduce the output ripple interference of the electric energy; the output post-processing unit is used to perform output backflow protection and output parallel current sharing operations on the electric energy.

[0039] The health management unit is used to monitor the voltage, current and temperature of the electric energy; the power-on control unit is used to input the distribution control of the power-on control instructions and the health management unit instructions; the auxiliary power supply unit is used to provide separate power supply for the health management unit and the power-on control unit.

[0040] Combination Figure 2The universal expansion configuration of the above architecture in high-power occasions is introduced as follows:

[0041] Based on the research on various current balancing methods such as the natural droop method, busbar current balancing method and master-slave setting method of DC-DC converters, a universal adaptive active parallel current balancing method is finally normalized based on the average current method current balancing strategy, thus forming the standardized circuit architecture of the present invention. In order to solve the problem of mismatched current balancing strategies of different DC-DC converters, the embodiments of the present invention can use an integrated current balancing chip to achieve a high-precision adaptive current balancing effect. Figure 2 As shown, 2n current-sharing buses are connected respectively through n power supplies to form an adaptive extended bus, which can expand the parallel connection of n modules for converting 270V input voltage to 12V channel and the parallel connection of n modules for converting 28V input voltage to 12V channel, thereby realizing universal parallel expansion of high-power output.

[0042] The following content introduces various specific implementation examples of the embodiments of the present invention and the specific functions of multiple units in each example.

[0043] Example 1

[0044] like Figure 1 As shown, an airborne power conversion architecture based on high integration and parallel expansion is applied to an airborne power module, including a front-end preprocessing unit, an input filtering unit, a voltage conversion unit, an output filtering unit and an output post-processing unit. Electric energy is input through the front-end preprocessing unit, passes through the input filtering unit, the voltage conversion unit and the output filtering unit in sequence, and is output as converted electric energy by the output post-processing unit; the front-end preprocessing unit is used for performing input short-circuit protection, reverse polarity protection and surge current suppression operations on the electric energy; the input filtering unit is used for performing input EMI filtering operations on the electric energy; the voltage conversion unit is used for converting the voltage of the input electric energy into the voltage of the output electric energy; the output filtering unit is used for reducing the output ripple interference of the electric energy; the output post-processing unit is used for performing output backflow protection and output parallel current sharing operations on the electric energy.

[0045] Example 2

[0046] Based on the first embodiment, this embodiment specifically describes multiple units in the airborne power conversion architecture.

[0047] The front-end preprocessing unit is used to perform input short-circuit protection operation on the electric energy. When the input electric energy is in overcurrent or short-circuit state, the corresponding fuse is blown to protect the subsequent other units;

[0048] The front-end preprocessing unit is used to reverse the polarity of the electric energy. When the positive and negative poles of the input electric energy are reversed, the electric energy path is cut off to protect other subsequent units.

[0049] The front-end preprocessing unit is used to perform surge current suppression operation on electric energy. At the moment of electric energy input, the generated surge current is suppressed within a preset range, thereby being compatible with the power module of the previous stage.

[0050] The input filter unit is used to suppress the common mode and differential mode interference of the input power through input EMI filtering operation, so as to meet the electromagnetic compatibility requirements;

[0051] The output filter unit is used to reduce the output ripple interference of the voltage in the DC output power by connecting a capacitor with an equivalent impedance lower than a preset threshold in parallel at the output end of the DC-DC converter according to the current of the power at the output end of the DC-DC converter in the voltage conversion unit.

[0052] The voltage conversion unit is used to realize the process of converting the voltage of input electric energy into the voltage of output electric energy through a DC-DC converter, including sub-process one of converting input 270V DC electric energy into output 12V DC electric energy one, and sub-process two of converting input 28V DC electric energy into output 12V DC electric energy two in parallel with sub-process one.

[0053] The output post-processing unit is used to perform output anti-backflow operation on electric energy, by connecting an ideal diode in series at the output end of the DC-DC converter of the voltage conversion unit to prevent the electric energy voltage of the subsequent power module from backflowing to the DC-DC converter;

[0054] The output post-processing unit is used to perform parallel current sharing operations on the output electric energy. According to the demand for onboard power resources, expansion and upgrading can be achieved by connecting power modules of the same architecture through a current sharing bus.

[0055] Example 3

[0056] Based on the embodiment 1 or 2, this embodiment makes a preferred improvement to the onboard power conversion architecture, and adds a health management unit, a power-on control unit and an auxiliary power supply unit to the architecture. Figure 1 's hint.

[0057] Among them, the health management unit is used to monitor the voltage, current and temperature of electric energy; the power-on control unit is used to input the distribution control of power-on control instructions and health management unit instructions; and the auxiliary power supply unit is used to provide separate power supply for the health management unit and the power-on control unit.

[0058] The detailed description of the above new units is as follows:

[0059] The health management unit is used to monitor the input voltage, input current, output voltage and output current of the electric energy in real time;

[0060] The health management unit is used to monitor the temperature of the DC-DC converter of the voltage conversion unit and the corresponding various heating devices in real time;

[0061] The health management unit is used to report the real-time monitored input voltage, input current, output voltage, output current and temperature to the external system through the CAN bus.

[0062] The power-on control unit is used to distribute the corresponding input power-on control instruction into two independent power-on control signals according to the preset input power-on control logic, so as to control the power-on and power-off process of the subsequent power supply module;

[0063] The power-on control unit is used to distribute the preset instructions into two independent power-on control signals after the health management unit receives and generates preset instructions through the CAN bus, thereby controlling the power-on and power-off process of the subsequent power supply module.

[0064] The auxiliary power supply unit is used to provide separate working power for the MCU and various types of interface chips in the health management unit; the auxiliary power supply unit is used to provide separate working power for various types of components in the power-on control unit.

[0065] Example 4

[0066] Based on any of the above embodiments, this embodiment provides an onboard power conversion device based on high integration and parallel expansion, which can be combined with Figure 2 As shown in the figure, the device is composed of multiple onboard power supply modules based on a highly integrated and parallel-expandable onboard power supply conversion architecture having any of embodiments 1 to 3.

[0067] It can be seen that the embodiments of the present invention can provide a standardized functional unit circuit architecture for new requirements of airborne power supply in application scenarios such as high density, miniaturization, and high-power expansion, meet the high-power expansion requirements through a normalized universal adaptive active parallel current sharing method, and enhance the flexible configuration capability of the airborne power supply architecture with a highly integrated and scalable design concept.

Claims

1. An airborne power conversion architecture based on high integration and parallel expansion, characterized by: The architecture is applied to an airborne power module, including a front-end preprocessing unit, an input filter unit, a voltage conversion unit, an output filter unit and an output post-processing unit. Electric energy is input through the front-end preprocessing unit, passes through the input filter unit, the voltage conversion unit and the output filter unit in sequence, and is output as converted electric energy by the output post-processing unit. The front-end pre-processing unit is used to perform input short-circuit protection, reverse polarity protection and surge current suppression operations on the electric energy; The input filter unit is used to perform input EMI filtering operation on the electric energy; the voltage conversion unit is used to convert the voltage of the input electric energy into the voltage of the output electric energy; The output filter unit is used to reduce the output ripple interference of the electric energy; the output post-processing unit is used to perform output backflow prevention and output parallel current equalization operations on the electric energy.

2. The high-integration parallel-expandable airborne power conversion architecture according to claim 1, characterized in that: The front-end preprocessing unit is used to perform input short-circuit protection operation on the electric energy. When the input electric energy is in overcurrent or short-circuit state, the corresponding fuse is blown to protect the subsequent other units; The front-end preprocessing unit is used to reverse the polarity of the electric energy. When the positive and negative poles of the input electric energy are reversed, the electric energy path is cut off to protect other subsequent units. The front-end preprocessing unit is used to perform surge current suppression operation on electric energy. At the moment of electric energy input, the generated surge current is suppressed within a preset range, thereby being compatible with the power module of the previous stage.

3. The high-integration parallel-expandable airborne power conversion architecture according to claim 1, characterized in that: The input filter unit is used to suppress the common mode and differential mode interference of the input power through input EMI filtering operation, so as to meet the electromagnetic compatibility requirements; The output filter unit is used to reduce the output ripple interference of the voltage in the DC output power by connecting a capacitor with an equivalent impedance lower than a preset threshold in parallel at the output end of the DC-DC converter according to the current of the power at the output end of the DC-DC converter in the voltage conversion unit.

4. The high-integration parallel-expandable airborne power conversion architecture according to claim 1, characterized in that: The voltage conversion unit is used to realize the process of converting the voltage of input electric energy into the voltage of output electric energy through a DC-DC converter, including sub-process one of converting input 270V DC electric energy into output 12V DC electric energy one, and sub-process two of converting input 28V DC electric energy into output 12V DC electric energy two in parallel with sub-process one.

5. The high-integration parallel-expandable airborne power conversion architecture according to claim 1, characterized in that: The output post-processing unit is used to perform output anti-backflow operation on electric energy, by connecting an ideal diode in series at the output end of the DC-DC converter of the voltage conversion unit to prevent the electric energy voltage of the subsequent power module from backflowing to the DC-DC converter; The output post-processing unit is used to perform parallel current sharing operations on the output electric energy. According to the demand for onboard power resources, expansion and upgrading can be achieved by connecting power modules of the same architecture through a current sharing bus.

6. The high-integration parallel-expandable airborne power conversion architecture according to claim 1, characterized in that: The architecture also includes a health management unit, a power-on control unit and an auxiliary power supply unit; the health management unit is used to monitor the voltage, current and temperature of the electric energy; the power-on control unit is used to input the distribution control of the power-on control instructions and the health management unit instructions; the auxiliary power supply unit is used to provide separate power supply for the health management unit and the power-on control unit.

7. The high-integration parallel-expandable airborne power conversion architecture according to claim 6, characterized in that: The health management unit is used to monitor the input voltage, input current, output voltage and output current of the electric energy in real time; The health management unit is used to monitor the temperature of the DC-DC converter of the voltage conversion unit and the corresponding various heating devices in real time; The health management unit is used to report the real-time monitored input voltage, input current, output voltage, output current and temperature to the external system through the CAN bus.

8. The high-integration parallel-expandable airborne power conversion architecture according to claim 6, characterized in that: The power-on control unit is used to distribute the corresponding input power-on control instruction into two independent power-on control signals according to the preset input power-on control logic, so as to control the power-on and power-off process of the subsequent power supply module; The power-on control unit is used to distribute the preset instructions into two independent power-on control signals after the health management unit receives and generates preset instructions through the CAN bus, thereby controlling the power-on and power-off process of the subsequent power supply module.

9. The high-integration parallel-expandable airborne power conversion architecture according to claim 6, characterized in that: The auxiliary power supply unit is used to provide separate working power for the MCU and various types of interface chips in the health management unit; the auxiliary power supply unit is used to provide separate working power for various types of components in the power-on control unit.

10. An airborne power conversion device based on high integration and parallel expansion, characterized in that: The device is composed of a plurality of airborne power supply modules having the airborne power conversion architecture based on high integration and parallel expansion as described in any one of claims 1 to 9.

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