Microsatellite power distribution thermal control management system, product and method

Abstract

The invention discloses a microsatellite power distribution thermal control management system, a product and a method, belongs to the field of satellite power supply and distribution, and solves the problems that a satellite power supply and distribution system in the prior art lacks unified standard support, is poor in universality and expansibility, long in development period and single in temperature acquisition method, and power distribution circuit fault isolation measures mostly are fuse fusing passive protection, so that the service life is short. And key information such as distribution current cannot be acquired. A microsatellite power distribution thermal control management system is constructed, satellite power distribution, satellite thermal control, fuse unlocking, SADA driving and power supply state monitoring functions are highly integrated on the basis of an internal bus technology, power distribution current information is collected in real time, and temperature collection is carried out in a mode of combining thermistor and single-bus digital temperature collection. The method is used for realizing highly integrated microsatellite power distribution thermal control management.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of satellite power supply and distribution, in particular to a micro-satellite power distribution thermal control management system, product and method. BACKGROUND

[0002] The satellite power supply and distribution system is an important subsystem for transforming, regulating and distributing power on the satellite, and is the safety bottom line for the satellite in-orbit operation. As a key technology of the satellite platform, any spacecraft must be equipped with a suitable and reliable power supply and distribution system. Unlike traditional satellites, micro-satellites have higher requirements for volume, weight, cost, efficiency, functional density, etc. under the premise of ensuring system function, performance and reliability. As a key technology of the satellite platform, the performance, weight and price of the power supply and distribution system have a significant impact on the overall design of the satellite.

[0003] Foreign small satellite power distribution systems basically adopt the design idea of standardization and modularization, integrating satellite power supply and distribution and thermal control functions. The low-power power supply control and distribution management unit developed by Thales Alenia Space mainly includes shunt regulation modules, discharge regulation modules, power distribution modules, thermal control modules, etc. All modules are electrically connected through a backplane.

[0004] Domestic small satellite integrated design started relatively late. Beijing Zero Gravity Space Technology Co., Ltd. currently has four mature small satellite platforms, including ZG3U, ZG6U, ZG30 and ZG100 satellite platforms. Each platform integrates a power supply and distribution control module, which is composed of a power distribution module and a voltage and current monitoring module. The power distribution voltage is divided into 5V and 12V, with a maximum single power distribution power of 60W, supporting battery pack management, power distribution control and voltage and current detection functions. Units such as 811 Institute and 18 Institute have carried out related research work on the integration of small satellite power distribution and thermal control systems, but the products designed by each unit lack unified standard support, have poor universality, weak scalability and long development cycle. Therefore, the development of a standardized and integrated power distribution and thermal control management system has great practical significance and practical value.

[0005] In the prior art, "Satellite Power Distribution and Thermal Control Unit Design Based on TMS570" is disclosed in Electronic Technology Application, Vol. 49, No. 12, 2023. A satellite power distribution and thermal control management unit is designed with a microcontroller TMS570 as the core. The system modules are integrated using an internal bus architecture, and data interaction with the central machine is realized through a CAN (Controller Area Network) bus, achieving functions such as on-board single-machine power distribution on-off control, whole-satellite temperature acquisition, heating band open-loop and closed-loop control, power state monitoring, SADA (Solar Array Drive Assembly) drive, software in-orbit reconstruction, etc. However, this technical solution has the following technical problems: 1. The single unit has limited power distribution capacity and weak load-carrying capacity. The number of power distribution and thermal control channels is limited, which can only be used for the needs of a single satellite project. The scalability is not high. The rated power of each power distribution channel is fixed, while the power distribution strategies of different satellite models are different. This technical solution cannot dynamically adjust the power distribution ratio of each channel, which may lead to insufficient power supply to key equipment and cannot be used for different power load requirements. 2. The fault isolation measures for power distribution circuits are mostly passive protection by fuse blowing. After the fuse blows, it cannot be reused, the fault cannot be recovered, and key information such as power distribution current cannot be collected. 3. The temperature acquisition method is singular, with each thermistor occupying one set of cables. For systems with a large number of temperature acquisition channels, the corresponding temperature acquisition cables are cumbersome and complex, which is not conducive to assembly and implementation.

[0006] In summary, existing satellite power supply and distribution systems lack unified standard support, have poor versatility and scalability, long development cycles, and limited temperature acquisition methods. Furthermore, the fault isolation measures for power distribution circuits are mostly passive protection through fuse blowing, which cannot collect key information such as power distribution current. Summary of the Invention

[0007] This invention solves the technical problems of existing satellite power supply and distribution systems, such as lack of unified standard support, poor versatility, weak scalability, long development cycle, and single temperature acquisition method. At the same time, the fault isolation measures of the power distribution circuit are mostly passive protection by fuse blowing, which cannot collect key information such as power distribution current.

[0008] The present invention discloses a microsatellite power distribution and thermal control management system, comprising a CPU subsystem, a power distribution drive subsystem, an analog quantity acquisition subsystem, a heating belt drive subsystem, a fuse control subsystem, a SADA drive subsystem, a primary power supply, and a secondary power supply; The CPU subsystem is used to receive instructions from the central computer and send instruction signals to the power distribution drive subsystem, the heating belt drive subsystem, the fuse control subsystem and the SADA drive subsystem, and to receive analog quantity acquisition information collected by the analog quantity acquisition subsystem and feed it back to the host computer. The analog quantity acquisition subsystem is used to acquire analog quantity acquisition information, including power distribution status, temperature, thermal control status, power telemetry status, SADA rotation position information and external analog quantities, and transmit the analog quantity acquisition information to the CPU subsystem. The power distribution drive subsystem is used to provide power supply circuits and circuit protection, and to transmit the power distribution status to the analog quantity acquisition subsystem. The heating belt drive subsystem is used to execute the instruction signals sent by the CPU subsystem, control the on and off of the heating belt, adjust the temperature of the controlled object, and transmit the thermal control status to the analog quantity acquisition subsystem. The fuse control subsystem is used for executing the instruction signal sent by the CPU subsystem to control the action of the sail unlocking mechanism through the fuse circuit. The SADA driving subsystem is used for executing the instruction signal sent by the CPU subsystem to control the rotating speed of the SADA stepping motor and transmit the SADA rotating position information to the analog quantity acquisition subsystem. The primary power supply and the secondary power supply supply power to the CPU subsystem, the analog quantity acquisition subsystem, the power distribution driving subsystem, the heating belt driving subsystem, the fuse control subsystem and the SADA driving subsystem in parallel, and the output power supply transmits the state.

[0009] Further, in an embodiment of the present application, the CPU subsystem comprises a main controller, a clock circuit, a reset circuit, a JTAG circuit, a debugging interface circuit, a power supply interface circuit, a communication interface circuit and an instruction interface circuit.

[0010] Further, in an embodiment of the present application, the analog quantity acquisition subsystem comprises a multiplexing switch, a voltage follower and an internal ADC conversion. The voltage signal of the reaction temperature is filtered through the multiplexing switch, and the filtered voltage signal of the reaction temperature is input into the ADC interface of the CPU subsystem through the internal ADC conversion by using the voltage follower, so as to complete the acquisition of the temperature quantity and the external analog quantity.

[0011] Further, in an embodiment of the present application, the power distribution driving subsystem comprises a 12V primary bus power distribution circuit and a 5.2V secondary power distribution circuit.

[0012] Further, in an embodiment of the present application, the system further comprises a level conversion circuit. The level conversion circuit is used for converting the CPU subsystem distribution instruction signal, and the corresponding module is controlled by using the converted CPU subsystem distribution instruction signal.

[0013] The computer program product of the present application is used for running the microsatellite power distribution thermal control management system, and comprises an interrupt service layer, a main program layer and a boot layer. The interrupt service layer is used for realizing the response and processing of the internal and external interrupts of the main controller of the CPU subsystem. The main program layer is used for realizing the initialization configuration, the data security protection, the CAN bus instruction processing, the telemetry acquisition, the active thermal control, the SADA driving, the power state monitoring and the on-orbit program reconstruction. The boot layer is used for executing the boot program.

[0014] The micro-satellite power distribution thermal control management method is based on the micro-satellite power distribution thermal control management system and the computer program product, and comprises the following steps: Step 1, after the micro-satellite power distribution thermal control management system is powered on, a boot program is executed, specifically as follows: The computer program product for running the micro-satellite power distribution thermal control management system is started, and if the program is correct, the software environment is initialized; Step 2, after the software environment is initialized, the heating band driving subsystem, the fuse control subsystem, the power distribution driving subsystem and the SADA driving subsystem respectively execute the instruction signals of the corresponding CPU subsystems, output the corresponding analog quantity acquisition information, periodically acquire the analog quantity acquisition information by using the analog quantity acquisition subsystem, and feed back the analog quantity acquisition information to the upper computer through the CPU subsystem; Step 3, after the upper computer receives the analog quantity acquisition information, the temperature quantity and the thermal control state output by the analog quantity acquisition subsystem are used as feedback, the trend temperature control method is used for satellite active thermal control, the SADA driving subsystem is used for SADA monitoring and control, and power supply loop protection and circuit protection are performed based on the power distribution state.

[0015] Further, in an embodiment of the present application, the trend temperature control method in step 3 is specifically as follows: The control parameters of each temperature control loop are set, including temperature control loop selection and control temperature upper and lower limits, and the heating power is adjusted according to the temperature ratio, so that the controlled temperature is controlled at (Tmax+Tmin) / 2, wherein Tmax is the maximum temperature and Tmin is the minimum temperature, and the input power and dissipation power of the controlled component are kept relatively balanced in unit time.

[0016] The present application solves the technical problems that the satellite power supply and distribution system lacks unified standard support, has poor universality, poor expansibility, long development cycle and single temperature acquisition method, and the power distribution circuit fault isolation measures are mostly passive protection by fuses, and the key information such as power distribution current cannot be acquired. The specific beneficial effects include: 1. The present application provides a micro-satellite power distribution thermal control management system, which is based on internal bus technology, highly integrates satellite power distribution, satellite thermal control, fuse unlocking, SADA driving and power state monitoring functions, has rich functions, high integration, is relatively independent, can be used in parallel, can be flexibly matched with different powers, meets the index requirements of different satellite models and different platforms, reduces the manpower and material resources cost of repeated design and development of single machines, and solves the technical problems that the satellite power supply and distribution system lacks unified standard support, has poor universality, poor expansibility and long development cycle in the prior art. 2. The micro-satellite power distribution thermal control management system, which adopts LTC7003 as a driving chip to carry a power distribution circuit, can collect power distribution current information in real time, integrates self-failure isolation functions such as over-current protection, over-voltage protection, over-heat protection and ground short-circuit protection, and fast recovery, and the circuit protection threshold can be adjusted by changing the resistance value of the driving circuit, so that the power distribution circuit is intelligent and reliable, and the technical problem that the power distribution circuit failure isolation measures are mostly passive protection by fuses and cannot collect key information such as power distribution current is solved. 3. The micro-satellite power distribution thermal control management system, which adopts a temperature collection mode combining a thermistor and a single-bus digital temperature collection, selects a single-bus collection mode for temperature collection points with low precision requirements, shares a group of buses for multiple temperature sensors, reduces the number of cables, facilitates assembly and implementation, reduces the complexity of the temperature collection system cable on the basis of increasing the number of temperature collection lines, is beneficial to satellite mass production, and solves the technical problem of single temperature collection method in the prior art. The micro-satellite power distribution thermal control management system has the characteristics of high system integration, greatly reduced system power consumption, reduced system weight, low cost, standardized interface, expandable function, good compatibility, easy on-orbit maintenance and the like. BRIEF DESCRIPTION OF DRAWINGS

[0017] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which: Figure 1 is a micro-satellite power distribution thermal control management system block diagram of the embodiment one; Figure 2 is a CPU subsystem block diagram of the embodiment one; Figure 3 is an analog quantity collection circuit principle block diagram of the embodiment one; Figure 4 is a micro-satellite power distribution thermal control management system software architecture diagram of the embodiment two; Figure 5 is a micro-satellite power distribution thermal control management system software main program flow chart of the embodiment three; Figure 6 is a +X side camera truss rod temperature schematic diagram of the embodiment three; Figure 7 is a camera secondary mirror temperature schematic diagram of the embodiment three. DETAILED DESCRIPTION

[0018] The various embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings. The embodiments described by reference to the accompanying drawings are exemplary and are intended to explain the present application, but cannot be understood as limiting the present application.

[0019] Embodiment one. A micro-satellite power distribution thermal control management system, comprising a CPU subsystem, a power distribution driving subsystem, an analog quantity acquisition subsystem, a heating band driving subsystem, a fuse control subsystem, a SADA driving subsystem, a primary power supply and a secondary power supply; The CPU subsystem is configured to receive instructions from a central computer and send instruction signals to the power distribution driving subsystem, the heating band driving subsystem, the fuse control subsystem and the SADA driving subsystem, and receive analog quantity acquisition information collected by the analog quantity acquisition subsystem and feed back to the upper computer. The analog quantity acquisition subsystem is configured to collect analog quantity acquisition information, which includes power distribution state, temperature quantity, thermal control state, power telemetry state, SADA rotation position information and external analog quantity, and transmit the analog quantity acquisition information to the CPU subsystem. The power distribution driving subsystem is configured to provide a power supply loop and circuit protection, and transmit the power distribution state to the analog quantity acquisition subsystem. The heating band driving subsystem is configured to execute the instruction signals sent by the CPU subsystem, control the conduction and turn-off of the heating band, adjust the temperature of the controlled object, and transmit the thermal control state to the analog quantity acquisition subsystem. The fuse control subsystem is configured to execute the instruction signals sent by the CPU subsystem, and control the action of the solar panel unlocking mechanism through the fuse circuit. The SADA driving subsystem is configured to execute the instruction signals sent by the CPU subsystem, control the rotation speed of the SADA stepper motor, and transmit the SADA rotation position information to the analog quantity acquisition subsystem. The primary power supply and the secondary power supply supply power to the CPU subsystem, the analog quantity acquisition subsystem, the power distribution driving subsystem, the heating band driving subsystem, the fuse control subsystem and the SADA driving subsystem in parallel, and output the power telemetry state.

[0020] The existing micro-satellite power distribution thermal control management system lacks a unified industry standard system, has poor compatibility, general applicability and expandability, is difficult to realize modular design, cross-platform application and adapt to the differentiated needs of different satellite models, has a long research and development cycle, and temperature acquisition only relies on traditional methods, lacks intelligent monitoring capability of multi-parameter fusion, and power distribution circuits generally use fuse passive protection mode, which cannot obtain real-time current and other key operation data, and cannot realize active early warning and accurate positioning of faults.

[0021] In order to solve the above technical problems, the embodiment provides a micro-satellite power distribution thermal control management system, which comprises a CPU subsystem, a power distribution driving subsystem, an analog quantity acquisition subsystem, a heating band driving subsystem, a fuse control subsystem, an SADA driving subsystem, a primary power supply and a secondary power supply; The CPU subsystem is composed of a main controller, a clock circuit, a reset circuit, a JTAG (Joint Test Action Group) circuit, a debugging interface circuit, a power supply interface circuit, a communication interface circuit and an instruction interface circuit and the like sub-function modules, and the CPU subsystem is the core of the power distribution thermal control management system, receives indirect instructions transmitted by a central computer through a bus interface, and reliably executes according to requirements, while collecting temperature quantity and analog quantity acquisition information, to realize active thermal control and autonomous management of power distribution.

[0022] The power distribution driving subsystem is composed of a 12V primary bus power distribution circuit and a 5.2V secondary power distribution circuit, adopts LTC7003 as a driving chip, and provides a stable power supply loop for each single machine on the satellite. The protection functions such as integrated thermal protection, ground short circuit protection and fault handling can be configured.

[0023] The analog quantity acquisition subsystem comprises a multiplexing switch, a voltage follower and an internal ADC conversion; The voltage signal of the reaction temperature is screened through the multiplexing switch, and the screened voltage signal of the reaction temperature is input into the ADC interface of the CPU subsystem through the internal ADC conversion by using the voltage follower, so that the collection of the temperature quantity and the external analog quantity is completed.

[0024] The information collected by the analog quantity acquisition subsystem includes external analog quantity, temperature quantity, thermal control state, power distribution state, SADA rotation position information and power telemetry state, the analog quantity input is acquired through the multiplexing switch acquisition circuit, the signal is finally transmitted to the internal ADC conversion unit through the voltage follower, the analog quantity is input into the ADC interface of the CPU subsystem through the internal ADC conversion, and the collection function of the analog quantity is realized.

[0025] The heating band driving subsystem receives the instructions of the CPU subsystem, controls the conduction and turn-off of the heating band, realizes the temperature rise and fall of the controlled object, and adjusts the conduction time of the heating band to control the temperature rise rate.

[0026] The fuse control subsystem receives the instructions of the CPU subsystem, controls the action of the sail unlocking mechanism through the fuse circuit to realize the unfolding of the sail.

[0027] The SADA driving subsystem receives the instructions of the CPU subsystem, controls the rotation and speed of the SADA stepping motor, detects whether the SADA limit device is triggered, and feeds back the SADA rotation position information to the CPU subsystem in real time.

[0028] Further, the micro-satellite power distribution thermal control management system of the embodiment further comprises a level conversion circuit; The level conversion circuit is configured to convert the CPU subsystem distribution instruction signal to a level, and control the corresponding module by using the level-converted CPU subsystem distribution instruction signal.

[0029] As shown in Figure 1 , the main controller of the CPU subsystem communicates with the outside through the CAN bus driving circuit, obtains the central machine control instruction, returns the related parameters to the central machine, converts the CPU control signal to a level through the level conversion circuit, controls each functional module, and the internal primary power supply and secondary power supply supply power to each module of the system.

[0030] As shown in Figure 2 , it is a system block diagram of the CPU subsystem of a micro-satellite power distribution thermal control management system designed by the embodiment. The CPU subsystem is the core of the power distribution thermal control unit. The main controller TMS570LS3137 is a 32-bit high-performance microcontroller for safety systems. The CPU subsystem is composed of sub-function modules such as main controller, clock circuit, reset circuit, JTAG circuit, debugging interface circuit, power supply interface circuit, communication interface circuit and instruction interface circuit. The core power supply is 1.2V, the IO interface power supply is 3.3V, and the ADC module power supply is 5V. The reset circuit is realized by MAX706 circuit. This chip can realize power-on reset and watchdog function. The CPU subsystem has 256k data storage and 3M space FLASH. The program runs directly in FLASH.

[0031] The microcontroller TMS570LS3137 has rich built-in resources. It has a built-in 3-way CAN bus protocol control kernel. The SN65HVD230D chip is used as the CAN communication interface chip, and the interface level is 3.3V, realizing the information interaction between the power distribution thermal control system and the outside.

[0032] In the embodiment, the voltage dividing circuit is composed of a thermistor and a standard resistor in series, and the voltage dividing value reflects the change of the resistance value of the thermistor with the temperature of the controlled object. The voltage signal reflecting the temperature is filtered by the multi-channel selection switch, and then input to the ADC interface of the CPU through the voltage follower, as shown in the circuit block diagram of Figure 3 .

[0033] Therefore, the embodiment adopts a system architecture of "main control board + power distribution board 1-n + thermal control board 1-n" in a stacked mode, driving between the board-level modules through an internal bus, optimizing a data bus and a control bus, realizing expansion and superposition of power distribution and thermal control functions according to requirements, collecting power distribution current information in real time through a power distribution driving subsystem, simultaneously integrating autonomous fault isolation functions such as overcurrent protection, overvoltage protection, overheat protection, and grounding short-circuit protection, and fast recovery, based on an analog quantity collection subsystem, adopting a temperature collection mode combining a thermistor and single-bus digital temperature collection, selecting a single-bus collection mode for temperature collection points with low precision requirements, sharing a group of buses by multiple temperature sensors, reducing the number of cables, solving the technical problems in the prior art that the satellite power distribution system lacks unified standard support, has poor universality, is not strong in expansion, has a long development cycle, and has a single temperature collection method, and that power distribution circuit fault isolation measures are mostly passive protection by fuses, and key information such as power distribution current cannot be collected.

[0034] Embodiment two: a computer program product for running the microsatellite power distribution and thermal control management system of embodiment one, including an interrupt service layer, a main program layer, and a boot layer. The interrupt service layer is configured to realize response and processing of internal and external interrupts of the main controller of the CPU subsystem. The main program layer is configured to realize initialization configuration, data security protection, CAN bus instruction processing, telemetry collection, active thermal control, SADA driving, power state monitoring, and on-orbit program reconstruction. The boot layer is configured to execute a boot program.

[0035] As shown in Figure 4 FIG. 1 is a software architecture block diagram of a microsatellite power distribution and thermal control management system designed by the embodiment, and the system software architecture adopts a pre-interrupt and post-interrupt background structure, mainly including a boot layer, a main program layer, and an interrupt service layer, and the software is stored in FLASH (a memory) in a three-module backup mode, and a version of the program needs to be selected for running when power is turned on or restarted, and this work is completed by the boot layer program.

[0036] The main program layer is the main body of the power distribution and thermal control software function implementation. It mainly includes initialization configuration, data security protection, CAN bus instruction processing, telemetry collection, active thermal control, SADA driving, power state monitoring, and on-orbit program reconstruction. Data security protection mainly guarantees the safety and integrity of in-chip RAM and FLASH data through data refreshing and checking, including periodic reading of all RAM (random access memory) data, triggering of an ECC data protection mechanism to prevent RAM data from being destroyed by single particle interference, and periodic initialization of all register configurations to prevent register data from being destroyed by interference.

[0037] The interrupt service layer responds to and processes internal and external interrupts of the main control chip, mainly including external interface interrupts, such as CAN bus communication, and internal interrupts, such as periodic timing and abnormal signal interrupts.

[0038] Implementation Method 3. This implementation method provides a microsatellite power distribution thermal control management method. The method is based on the microsatellite power distribution thermal control management system described in Implementation Method 1 and the computer program product described in Implementation Method 2, and includes the following steps: Step 1: After the microsatellite power distribution and thermal control management system is powered on, it executes the boot program, specifically as follows: Start the computer program product used to run the microsatellite power distribution and thermal control management system. If the program is verified to be correct, initialize the software environment. In this embodiment, the program verification being correct means that the program data CRC check passes; Step 2: After the software environment initialization is completed, the heating belt drive subsystem, fuse control subsystem, power distribution drive subsystem and SADA drive subsystem execute the instruction signals of the corresponding CPU subsystem, output the corresponding analog quantity acquisition information, use the analog quantity acquisition subsystem to periodically acquire analog quantity acquisition information, and feed the analog quantity acquisition information back to the host computer through the CPU subsystem. Step 3: After receiving the analog signal acquisition information, the host computer uses the temperature and thermal control status output by the analog signal acquisition subsystem as feedback, performs active thermal control of the satellite using the trend temperature control method, performs SADA monitoring and control using the SADA drive subsystem, and performs power supply circuit protection and circuit protection based on the power distribution status.

[0039] The trend-based temperature control method in step 3 is specifically as follows: Set the temperature control threshold for each temperature control loop, and set the control parameters for each temperature control loop. The control parameters include the selection of the temperature control loop and the upper and lower limits of the control temperature. Adjust the heating power according to the temperature ratio to control the controlled temperature at (Tmax+Tmin) / 2, where Tmax is the maximum temperature and Tmin is the minimum temperature, so as to maintain a relative balance between the input power and dissipation power of the controlled component per unit time.

[0040] like Figure 5 The diagram shown is a software flowchart of a microsatellite power distribution and thermal control management system designed in this embodiment. After the system is powered on, the boot program is executed first, and a version is selected from the three-mode redundant backup program to start. If the program is verified to be correct, it jumps to the version to run and initializes the software environment, and completes the initialization of registers and global variables.

[0041] After initialization, the CPU subsystem reads the MAX706 reset status through the IO pin, and then enters the main loop after the reset is completed. In the main loop, the functions such as power distribution drive, SADA drive, and fuse unlocking are completed by processing CAN bus commands, and the related parameters are returned to the central machine.

[0042] Periodic analog quantity acquisition information acquisition is performed, and the analog quantity acquisition information includes external analog quantity, temperature quantity, power telemetry quantity, heating state, and power distribution state. The acquisition period of the analog quantity acquisition information is 125 ms, a data smoothing filter algorithm is used to reduce external interference and improve acquisition accuracy. The smoothing filter algorithm is mean filtering, the data window length is 10, and for the same type of sampling data, the average value of a group of 10 sampling data is taken as the filter output of the group data. The collected temperature quantity and thermal control state are used as feedback, combined with the corresponding temperature control threshold, the on-off of each temperature control point heating band is driven to realize active thermal control of the satellite, the power state monitoring is performed based on the power telemetry state output by the fuse control subsystem, and the SADA monitoring and control is performed by using the SADA drive subsystem.

[0043] To ensure temperature control accuracy, a trend temperature control method is provided in the embodiment. The software sets the temperature control threshold value of each temperature control loop, i.e. the maximum temperature Tmax and the minimum temperature Tmin. The heating power is adjusted according to the temperature ratio to control the temperature near (Tmax+Tmin) / 2, so as to keep the input power and dissipation power of the controlled component relatively balanced within a unit time. The control parameters of each temperature control loop can be set by software, including temperature control loop selection, control temperature upper and lower limits, etc. The specific method is as follows: the temperature control period is 4 s, and the heating time can be 0, 1, 2, 3, or 4 s. If the temperature is less than the middle value of the temperature control threshold and does not rise, the heating time is increased by 1 s (not increased when equal to 4), otherwise the heating time is maintained unchanged; if the temperature is greater than or equal to the middle value of the temperature control threshold and does not decrease, the heating time is decreased by 1 s (not decreased when equal to 0), otherwise the heating time is maintained unchanged.

[0044] As shown in Figure 6 , Figure 7 the temperature control data after using the trend temperature control algorithm are shown in Figure 6 the temperature of the satellite +X side camera truss rod, the temperature control threshold is 20.5℃-21.5℃, Figure 7 the temperature of the camera secondary mirror, the temperature control threshold is 19.5℃-20.5℃, the telemetry temperature is within the temperature control range, and the temperature control effect is obviously better than the index requirement. By using the trend temperature control algorithm, the temperature accuracy and stability are improved, and the temperature control stability is improved by 60%.

[0045] The above describes in detail the micro-satellite power distribution thermal control management system, product and method provided by the present application. The principles and implementation manners of the present application are described by using specific examples. The above examples are only used to help understand the method of the present application and its core idea. Meanwhile, for those skilled in the art, the specific implementation manners and application ranges will be changed according to the idea of the present application. In conclusion, the content of the present description should not be understood as a limitation of the present application.

Claims

1. A power distribution and thermal control management system for microsatellites, characterized in that, The system comprises a CPU subsystem, a power distribution driving subsystem, an analog quantity acquisition subsystem, a heating band driving subsystem, a fuse control subsystem, a SADA driving subsystem, a primary power supply and a secondary power supply; The CPU subsystem is configured to receive instructions from a central machine and send instruction signals to the power distribution driving subsystem, the heating band driving subsystem, the fuse control subsystem and the SADA driving subsystem, and receive analog quantity acquisition information collected by the analog quantity acquisition subsystem and feed back the analog quantity acquisition information to the upper computer; The analog quantity acquisition subsystem is configured to collect analog quantity acquisition information, which comprises power distribution states, temperature quantities, thermal control states, power telemetry states, SADA rotation position information and external analog quantities, and transmit the analog quantity acquisition information to the CPU subsystem; The power distribution driving subsystem is configured to provide a power supply loop and circuit protection, and transmit the power distribution states to the analog quantity acquisition subsystem; The heating band driving subsystem is configured to execute the instruction signals sent by the CPU subsystem, control the conduction and shutdown of the heating band, adjust the temperature of the controlled object, and transmit the thermal control states to the analog quantity acquisition subsystem; The fuse control subsystem is configured to execute the instruction signals sent by the CPU subsystem, and control the action of the panel unlocking mechanism through a fuse circuit; The SADA driving subsystem is configured to execute the instruction signals sent by the CPU subsystem, control the rotation speed of the SADA stepper motor, and transmit the SADA rotation position information to the analog quantity acquisition subsystem; The primary power supply and the secondary power supply supply power to the CPU subsystem, the analog quantity acquisition subsystem, the power distribution driving subsystem, the heating band driving subsystem, the fuse control subsystem and the SADA driving subsystem in parallel, and output power telemetry states.

2. The power distribution and thermal control management system for microsatellites according to claim 1, characterized in that, The CPU subsystem comprises a main controller, a clock circuit, a reset circuit, a JTAG circuit, a debugging interface circuit, a power supply interface circuit, a communication interface circuit and an instruction interface circuit.

3. The power distribution and thermal control management system for microsatellites according to claim 1, characterized in that, The analog quantity acquisition subsystem comprises a multiplexing switch, a voltage follower and an internal ADC converter. A voltage division circuit is composed of a thermistor and a standard resistor in series, a channel screening of a voltage signal of a reaction temperature is performed through the multiplexing switch, the screened voltage signal of the reaction temperature is input into an ADC interface of the CPU subsystem through the internal ADC converter by using the voltage follower, and the collection of the temperature quantity and the external analog quantity is completed.

4. The power distribution and thermal control management system for microsatellites according to claim 1, characterized in that, The power distribution driving subsystem comprises a 12V primary bus power distribution circuit and a 5.2V secondary power distribution circuit.

5. The power distribution and thermal control management system for microsatellites according to claim 1, characterized in that, The system further comprises a level conversion circuit. The level conversion circuit is configured to perform level conversion on the CPU subsystem distribution instruction signals, and control corresponding modules by using the level-converted CPU subsystem distribution instruction signals.

6. A computer program product for operating the micro-satellite power distribution and thermal control management system according to any one of claims 1 to 5, characterized in that, The system comprises an interrupt service layer, a main program layer and a boot layer. The interrupt service layer is configured to realize the response and processing of internal and external interrupts of the main controller of the CPU subsystem. The main program layer is configured to realize initialization configuration, data security protection, CAN bus instruction processing, telemetry acquisition, active thermal control, SADA driving, power state monitoring and on-orbit program reconstruction. The boot layer is configured to execute a boot program.

7. A method for power distribution and thermal control management of a microsatellite, the method being implemented based on the microsatellite power distribution and thermal control management system of claim 1 and the computer program product of claim 6, wherein, The system comprises the following steps: Step 1, after the power-on of the micro-satellite power distribution thermal control management system, a boot program is executed, specifically: Start the computer program product for running the micro-satellite power distribution thermal control management system, and if the program verification is correct, initialize the software environment; Step 2, after the software environment initialization is completed, the heating band driving subsystem, the fuse control subsystem, the power distribution driving subsystem and the SADA driving subsystem respectively execute the instruction signals of the corresponding CPU subsystem, output the corresponding analog quantity acquisition information, periodically acquire the analog quantity acquisition information by using the analog quantity acquisition subsystem, and feed back the analog quantity acquisition information to the upper computer through the CPU subsystem; Step 3, after the upper computer receives the analog quantity acquisition information, the temperature quantity and the thermal control state output by the analog quantity acquisition subsystem are used as feedback, the trend temperature control method is used for satellite active thermal control, the SADA driving subsystem is used for SADA monitoring and control, and based on the power distribution state, power supply loop protection and circuit protection are carried out.

8. The power distribution and thermal control management method for microsatellites according to claim 7, characterized in that, The trend temperature control method in step 3 is specifically: Set the temperature control threshold corresponding to each temperature control loop, and set the control parameters of each temperature control loop, including temperature control loop selection and control temperature upper and lower limit, adjust the heating power according to the temperature ratio, so that the controlled temperature is controlled in (Tmax+Tmin) / 2, wherein Tmax is the maximum temperature and Tmin is the minimum temperature, and the input power and dissipation power of the controlled component are kept relatively balanced within a unit time.

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