Power supply and distribution system of on-satellite real-time information processing system

Abstract

The invention belongs to the technical field of on-satellite intelligent information processing power supply and distribution, and discloses a power supply and distribution system of an on-satellite real-time information processing system. The system is composed of a short circuit protection circuit (10), a surge suppression circuit (20), a satellite real-time processing system switching circuit (30) based on a magnetic latching relay, an EMI filter (40), a DC-DC power supply module (50), a relay-based power supply and distribution switching circuit (60), a DC-DC power supply module (70) and a DC-DC power supply module (80). According to the invention, the power supply problem of any dynamic redundancy unit in the satellite real-time information processing system is solved, and the sneak path problem caused by misoperation in the use process is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply and distribution for onboard intelligent information processing, and in particular to a power supply and distribution system for an onboard real-time information processing system. Background Art

[0002] With the continuous iteration of camera technology, the amount of image data from large-field-of-view cameras has increased rapidly, reaching tens of Gbps. Compared with the previous generation of cameras, the amount of data has increased dozens of times, posing new challenges to onboard real-time information processing technology. It is crucial to develop a power supply and distribution unit that is adapted to the onboard real-time information processing system with a high-throughput, high-reliability dynamic redundant architecture. Summary of the invention

[0003] In response to the demand for power supply and distribution units in a satellite real-time information processing system with a dynamic redundant architecture, the present invention provides a power supply and distribution system for the satellite real-time information processing system, which solves the power supply problem of any dynamic redundant unit in the satellite real-time information processing system and avoids the hidden path problem caused by misoperation during use.

[0004] The present invention provides a power supply and distribution system for a satellite real-time information processing system, the system comprising:

[0005] It consists of a short-circuit protection circuit, a surge suppression circuit, an onboard real-time processing system switching circuit based on a magnetic latching relay, an EMI filter, a DC-DC power supply module, a power supply and distribution switching circuit based on a relay, a DC-DC power supply module and a DC-DC power supply module.

[0006] Preferably, the system adopts a traditional cold standby mode, including two sets of power supply and distribution units, the main and backup have no electrical connection and are physically completely isolated. When the preset requirements are met, the satellite starts the main part of the onboard real-time information processing system, that is, the main power supply and distribution unit works; only when the main part of the onboard real-time information processing system fails to meet the preset requirements in orbit, will the backup be enabled as a fault plan.

[0007] Preferably, the short-circuit protection circuit adopts a fuse branch connected in series with a current-limiting resistor, which is composed of R1, R2, F1, F2, F3 and F4. The parallel equivalent resistance of R1 and R2 should be greater than 10 times the equivalent resistance of the fuse. The rated working current of the selected fuse should meet the following requirements:

[0008] (I M ×2)<I 熔断器 <(I M +7),

[0009] Among them, I M is the maximum rated operating current of the onboard real-time information processing system, I 熔断器is the rated current of the selected fuse.

[0010] Preferably, the surge suppression circuit is composed of capacitors C1, C2, C3, C4, resistors R3, R4, R5, R6, and P-channel MOSFET tubes Q1, Q2, Q3.

[0011] Preferably, the on-board real-time processing system switch circuit based on the magnetic latching relay is the switch of the entire system: when the "power on" instruction is responded, the magnetic latching relay is in the open state, and the entire system works normally as long as the 42V primary bus is powered on; when the "power off" instruction is responded, the relay is in the disconnected state, and the entire system does not work; the "power on" and "power off" instructions are both OC gate instructions, 80ms pulse, and low level is effective;

[0012] The switching circuit of the on-board real-time processing system based on the magnetic latching relay adopts the measures of connecting diodes D1 and D2 in series, diodes D3 and D4 in series, and resistors R7 and R8 in parallel. The diodes are high-voltage resistant, planar silicon switching diodes; the resistors are metal film resistors, with a resistance value less than 1 / 10 of the equivalent resistance value of the relay and a power not greater than 0.25W.

[0013] Preferably, the on-board real-time processing system based on the magnetic latching relay includes:

[0014] Step 1, the power supply and distribution unit receives a 42V power supply from the primary bus and protects the primary bus on the star through a short-circuit protection circuit;

[0015] Step 2, the bus current flows into the surge suppression circuit after passing through step 1;

[0016] Step 3, the current is input into the EMI filter after passing through step 2, wherein the EMI filter includes: EMI filter 1 and EMI filter 2;

[0017] Step 4: The bus current passes through EMI filter 1 and is input into a DC-DC power module and n DC-DC power modules; the current passes through EMI filter 2 and is input into a DC-DC power module and mn DC-DC power modules.

[0018] Preferably, the number x of EMI filters (40) required is:

[0019] x≥42×2×I M / W EMI ,

[0020] Among them, I M is the maximum rated operating current of the onboard real-time information processing system, W EMI is the rated output power of the selected EMI filter.

[0021] Preferably, the DC-DC power supply module converts the 42V bus power supply into a 5V secondary power supply, and directly supplies power to the power supply and distribution unit and the measurement, control and configuration management unit without a relay switch; wherein the measurement, control and configuration management unit includes 1553B, system telemetry and remote control, image processing unit power on and off control, and health status management functions;

[0022] The DC-DC power supply module converts the 42V power supply into a 12V power supply to provide power to the relay-based power supply and distribution switch circuit;

[0023] The DC-DC power supply module converts 42V power into 5V power output, and supplies power to each image processing unit through a separate relay-based power supply and distribution switch circuit: when the relay is turned on, the 5V power output by the DC-DC power supply module can ensure the normal operation of the corresponding image processing unit; when the relay is turned off, the 5V power output by the DC-DC power supply module cannot supply power to the corresponding image processing unit.

[0024] Preferably, the relay-based power supply and distribution switch circuit (60) comprises: a negative current driver, an AD converter, a magnetic latching relay and a 12V power supply;

[0025] Among them, the main magnetic latching relay REL1 can receive power from both the main 12V power supply and the backup 12V power supply; it can receive both the main magnetic latching relay excitation pulse and the backup magnetic latching relay excitation pulse.

[0026] Preferably, supplying power to each image processing unit via a separate relay-based power distribution switch circuit (60) comprises:

[0027] The main power distribution unit relay REL1 and the backup power distribution unit relay REL1 are equivalent to being connected in parallel, the welding points 1 and 7 of the main REL1 are connected with the welding points 4 and 10 of the backup REL1; the welding points 4 and 10 of the main REL1 are connected with the welding points 1 and 7 of the backup REL1;

[0028] When A_CK_POWEN_CL1 initiates a pulse signal, A_DY_FR_CK_POWEN_CL1 is converted into a negative pulse with an amplitude of 12V, driving the coil to generate magnetic force. At this time, the solder joints 3 and 9 of the main REL1 are connected to the solder joints 1 and 7, and the solder joints 3 and 9 of the standby REL1 are connected to the solder joints 4 and 10, thereby supplying the 5V power supply of the main U2 to the image processing unit 1;

[0029] When A_CK_POWOFF_CL1 initiates a pulse signal, A_DY_FR_CK_POWOFF_CL1 is converted into a negative pulse with an amplitude of 12V, driving the coil to generate magnetic force. At this time, the solder joints 3 and 9 of the main REL1 are connected to the solder joints 4 and 10, and the solder joints 3 and 9 of the standby REL1 are connected to the solder joints 1 and 7, and the image processing unit 1 is in a power-off state;

[0030] When B_CK_POWEN_CL1 initiates a pulse signal, B_DY_FR_CK_POWEN_CL1 is converted into a negative pulse with an amplitude of 12V, driving the coil to generate magnetic force. At this time, the solder joints 3 and 9 of the main REL1 are connected to the solder joints 4 and 10, and the solder joints 3 and 9 of the standby REL1 are connected to the solder joints 1 and 7, thereby supplying the 5V power supply of the standby U2 to the image processing unit 1;

[0031] When B_CK_POWOFF_CL1 initiates a pulse signal, B_DY_FR_CK_POWOFF_CL1 is converted into a negative pulse with an amplitude of 12V, driving the coil to generate magnetic force. At this time, the solder joints 3 and 9 of the main REL1 are connected to the solder joints 1 and 7, and the solder joints 3 and 9 of the backup REL1 are connected to the solder joints 4 and 10, then the image processing unit 1 is in a power-off state.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] (1) The present invention proposes a switching circuit based on a magnetic latching relay to solve the problem of powering on and off a single image processing unit in a power supply and distribution unit;

[0034] (2) The present invention has good expansion capability. If the processing capability needs to be further improved after being in orbit, more processing units can be activated for expansion;

[0035] (3) The present invention adopts a dual magnetic latching relay in parallel to solve the hidden path problem of the main and standby power supply units under the dynamic redundant architecture. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0037] Figure 1 This is a block diagram of the power supply and distribution principle of the onboard real-time information processing system according to an embodiment of the present invention;

[0038] Figure 2 This is a DC-DC module output circuit diagram of the onboard real-time information processing power supply and distribution system of the embodiment of the present invention;

[0039] Figure 3 It is a principle block diagram of a switch circuit based on a relay in a satellite real-time information processing and power supply and distribution system according to an embodiment of the present invention;

[0040] Figure 4 This is a principle block diagram of a relay-based switch circuit in an onboard real-time information processing and power distribution system of a dynamic redundant architecture according to an embodiment of the present invention.

[0041] Description of the drawings: 10. Short-circuit protection circuit, 20. Surge suppression circuit, 30. Onboard real-time processing system switching circuit based on magnetic latching relay, 40. EMI filter, 50. DC-DC power supply module, 60. Power supply and distribution switching circuit based on relay, 70. DC-DC power supply module, 80. DC-DC power supply module. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0043] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the embodiments of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0044] First, some technical terms used in the present invention are explained:

[0045] The traditional cold standby mode is a data backup method that involves performing backup operations when the database is closed. Features: Data consistency: Cold standby can ensure the integrity and consistency of the database at the backup time point, because the database is closed during the backup and no new data will be written. System unavailability: During the cold standby period, the database is unavailable, which may have a significant impact on the business. Backup process: Usually includes copies of data files, control files, and archive logs. Steps: 1 Collect database file set information: Determine the location of the database's data files, log files, control files, etc. 2 Close the database: Close the database within the plan to ensure data consistency. 3 Execute the copy: Copy the database files to the backup path or backup device. 4 Start the database: Start the database immediately after the backup is completed and resume service.

[0046] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0047] Embodiment 1

[0048] like Figure 1 As shown, the present invention proposes a principle block diagram of a power supply and distribution system of a satellite real-time information processing system. The system is composed of a short circuit protection 10, a surge suppression circuit 20, a satellite real-time processing system switch circuit 30 based on a magnetic latching relay, an EMI filter circuit 40, a DC-DC power supply module 50, a relay-based power supply and distribution switch circuit 60, a DC-DC power supply module 70 and a DC-DC power supply module 80.

[0049] The bus current enters the surge suppression circuit 20 after passing through the short-circuit protection module 10; the current enters the two parallel EMI filter circuits 1 and EMI filter circuits 2 after the surge current is suppressed by the surge suppression circuit 20; the current filtered by the EMI filter circuit 1 enters the n parallel DC-DC power modules 50 and DC-DC power modules 70 respectively, and at the same time, after filtering by the EMI filter circuit 2, enters the m-n+1 parallel DC-DC power modules 50 and DC-DC power modules 80 respectively; the current then passes through the m DC-DC power modules 50 and then outputs the voltage of the DC-DC power module 50 to other functional boards of the onboard real-time information processing system through the control of m relay-based power supply switch circuits 60. The onboard real-time processing system switch circuit 30 based on magnetic latching relay is mainly used for the whole satellite to control the power on and off of the onboard real-time information processing system.

[0050] The power supply and distribution system for the onboard information system adopts the traditional cold standby mode, that is, in order to improve the reliability of the system, the system includes two sets of power supply and distribution units, the main and the backup, which have no electrical connection and are completely isolated physically. Under normal circumstances, the satellite starts the main part of the onboard real-time information processing system, that is, the main power supply and distribution unit works; only when the main part of the onboard real-time information processing system has an abnormality in orbit, the backup will be activated as a fault plan.

[0051] Combination Figures 2 to 4 Describe the specific implementation mode of the present invention:

[0052] It should be noted that the on-board real-time processing system switch circuit 30 based on the magnetic latching relay is the switch of the entire system: when the "power on" instruction responds, the magnetic latching relay is in the open state, and the entire system can work normally as long as the 42V primary bus is powered on; when the "power off" instruction responds, the relay is in the disconnected state, and the entire system does not work. The "power on" and "power off" instructions are both OC gate instructions, 80ms pulse, and low level is effective. The relay power supply 28V is divided into 4 paths after passing through parallel resistors R7 and R8, and is respectively connected to the series diodes D1 and D2, the series diodes D3 and D4, and the two excitation coils of the relay; the other ends of the two excitation coils of the relay are respectively connected to the whole satellite input signals "power on" and "power off". The diode can be a high-voltage resistant, planar silicon switching diode, such as 2CK81D, 2CK84F, etc.; the resistor can be a metal film resistor, the resistance value is less than 1 / 10 of the equivalent resistance value of the relay, and the power is not more than 0.25W. The following specific implementation steps are carried out when the relay 30 is turned on:

[0053] Step 1, the power supply and distribution unit receives the 42V power supply of the primary bus, and protects the primary bus on the star through the short-circuit protection circuit 10. The short-circuit protection circuit 10 adopts the method of connecting the fuse branch in series with the current-limiting resistor, which is composed of R1, R2, F1, F2, F3 and F4. The parallel equivalent resistance of R1 and R2 should be more than 10 times greater than the equivalent resistance of the fuse, and the rated working current of the selected fuse should meet the following requirements:

[0054] (I M ×2)<I 熔断器 <(I M +7)

[0055] Where: IM is the maximum rated operating current of the onboard real-time information processing system, I fuse is the rated current of the selected fuse;

[0056] Step 2: After step 1, the bus current flows into the surge suppression circuit 20 composed of capacitors C1, C2, C3, C4, resistors R3, R4, R5, R6, and P-channel MOSFET tubes Q1, Q2, and Q3 to prevent the instantaneous large current introduced by the low equivalent ESR capacitor from burning the fuse or other devices at the moment of power-on. The working principle of the surge suppression circuit 20 is: at the moment of system power-on, the gate-source voltage of the MOSFET tubes Q1, Q2, and Q3 is zero, the MOS tube is in the cut-off state, and the power supply charges the equivalent capacitor C composed of C1, C2, C3, and C4 through the resistor. As the voltage across the capacitor equivalent capacitor C gradually increases, the gate voltage gradually increases and reaches the turn-on voltage, the MOSFET turns on and works in the linear region, and the drain current IDS is proportional to the gate voltage UGS. In the process of Q1, Q2, and Q3 being turned on, the filter capacitor and the load capacitor in the subsequent circuit are gradually charged to stability, thereby ensuring that the surge current is suppressed. The requirements for surge suppression can be met by adjusting the values ​​of capacitors C1, C2, C3, C4 and resistors R3, R4, R5, R6;

[0057] Step 3, after the current passes through step 2, it is input into the EMI filter 40. The EMI filter can avoid the common mode noise generated by the self-excited oscillation of the DC-DC module and reduce the current ripple reflected back to the primary bus. The input filter module can be designed by yourself, usually a π-type filter composed of capacitors and inductors, and attention should be paid to the selection of filter parameters; or directly purchase an EMI filter with matching parameters from the same manufacturer as the DC-DC module. Domestic manufacturers of EMI filters and DC-DC modules include 529 Factory, 771 Institute, 43 Institute, etc., and imported manufacturers include VPT Company, Interpoint Company, IR Company, etc. Figure 2 Only two EMI filters, U1 and U2, are shown. The actual number required depends on the type of EMI filter selected and the power consumption of the system. Considering derating, the number of EMI filters x required by the specific system is:

[0058] x≥42×2×I M / W EMI

[0059] Where: IM is the maximum rated operating current of the onboard real-time information processing system, and WEMI is the rated output power of the selected EMI filter.

[0060] Step 4, the bus current is input into a DC-DC power module 70 and n DC-DC power modules 50 after passing through the EMI filter 1; the current is input into a DC-DC power module 80 and mn DC-DC power modules 50 after passing through the EMI filter 2. The function of the DC-DC power module 70 is to convert the 42V bus power into a 5V secondary power supply, without the need for a relay switch, and directly supply power to the power supply and distribution unit and the measurement, control and configuration management unit. The measurement, control and configuration management unit includes functions such as 1553B (a bus communication), system telemetry and remote control, image processing unit power on and off control, and health status management. The DC-DC power module 80 converts the 42V power supply into a 12V power supply, and provides power to the relay-based power supply and distribution switch circuit 60. The function of the m DC-DC power supply modules 50 is to convert the 42V power supply into a 5V power output, and supply power to each image processing unit through a separate power supply and distribution switch circuit 60: when the relay is turned on, the 5V power output by the DC-DC power supply module 50 can ensure the normal operation of the corresponding image processing unit; when the relay is closed, the 5V power output by the DC-DC power supply module 50 cannot supply power to the corresponding image processing unit, refer to step 5 for details.

[0061] Under normal circumstances, only n relays need to be turned on for n image processing units to work normally, meeting the detection function of the minimum on-board real-time information processing system. During on-orbit operation, when one of the image processing units is abnormal, the remaining mn image processing units can be used as dynamic redundant backup units. When an image processing unit is abnormal on-orbit and cannot be restored by resetting and re-powering on, the power supply can be cut off by turning off the relay related to the abnormal image processing unit; any of the remaining mn relays can be turned on, and the corresponding image processing unit can replace its function. Or when the algorithm is upgraded on-orbit, the unopened relays can be additionally turned on to activate the remaining image processing units to achieve on-orbit resource upgrade and expansion.

[0062] Step 5.1, refer to Figure 3 , a schematic diagram of the relay-based switch circuit in the onboard real-time information processing and power distribution system is given. Specifically:

[0063] Taking one of the power supply and distribution units as an example, U1 converts the 42V bus power supply into a 12V power supply A_VCC12V0_REL, which is used as the power supply for all relays in the power supply and distribution unit; the 8-way AD converter U3 receives the 5V level output by U2 through the three control signals A_CK_SCLK, A_CK_DIN, and A_CK_CS output by the measurement, control, and configuration management unit, and converts the 5V level into a digital signal, which is returned to the measurement, control, and configuration management unit through A_CK_DOUT, thereby monitoring the health status of U2. U3 can use the AD converter B128S102RH from the Beijing Institute of Microelectronics Technology, or ADC128S102 from TI.

[0064] In order to minimize the switching frequency of the relay and improve the reliability of on-orbit operation, relay REL1 uses a magnetic latching relay with two sets of switching contacts. This is because: electromagnetic relays use electrical signals to generate electromagnetic force in the electromagnet core, so that the contacts can be operated to achieve open, closed or open-close state conversion. Therefore, the electromagnetic relay cannot maintain the open and closed state of the contacts. Every time the system is powered on and off, the relay contacts can be operated, which greatly increases the frequency of use of the relay. The open and closed state of the contacts of the magnetic latching relay is maintained by the magnetic force generated by the permanent magnet. Usually, the contacts are in a held state and the coil does not need to be energized. When the contacts of the relay need to change state, that is, from open to closed, or from closed to open, it is only necessary to excite the coil with a DC pulse voltage, and the coil can instantly complete the open and closed state conversion.

[0065] The coil impedance of relay REL1 is usually in the order of tens of Ω. To drive its contacts, the pulse driving capability needs to reach the hundreds of milliamperes level. The driving capability of conventional level conversion driver chips is currently in the tens of milliamperes, which cannot realize the opening and closing of the relay, so a dedicated current driver needs to be selected. The present invention uses the negative current driver BM2711MQRH, which can convert the 5V relay pulse control signal A_CK_POWEN_CL1, A_CK_POWOFF_CLI of the measurement, control and configuration management unit into the OC gate negative pulse command signal A_DY_FR_CK_POWEN_CL1, A_DY_FR_CK_POWOFF_CLI with a driving capability of not less than 200mA. That is, when A_CK_POWEN_CL1 initiates a pulse signal, A_DY_FR_CK_POWEN_CL1 is converted into a negative pulse with an amplitude of 12V, the driving coil generates magnetic force, contacts 3 and 9 are connected with contacts 1 and 7, thereby supplying U2's 5V power supply to image processing unit 1; when A_CK_POWOFF_CL1 initiates a pulse signal, A_DY_FR_CK_POWOFF_CL1 is converted into a negative pulse with an amplitude of 12V, the driving coil generates magnetic force, contacts 3 and 9 are connected with contacts 4 and 10, and the image processing unit 1 is in a power-off state.

[0066] The overall power consumption of the negative current driver is the power consumption of the conduction channel superimposed. There are n magnetic latching relays in the power supply and distribution unit. Therefore, the number of relays y allowed to be turned on at the same time is:

[0067] y≤P M / (I IH ×V EN +I VDD ×V DD +I O ×V CESAT )

[0068] Where: IIH is the current of single channel EN, VEN is the voltage of single channel EN, IVDD is the current of negative current driver in single channel case, VDD is the operating voltage of negative current driver, Io is the current of single channel output OC gate, VCESAT is the voltage of single channel output OC gate.

[0069] Figure 3 The power supply and distribution switch circuit 60 based on the magnetic latching relay only shows the connection relationship between the main power supply and distribution unit and the main image processing unit. The connection relationship between the backup power supply and distribution unit and the backup image processing unit is exactly the same as that of the main unit. This solution can only be used for the cold backup on-board real-time processing system, that is, the main and backup units are completely isolated and there is no physical connection relationship. This is because:

[0070] In the satellite information processing system with dynamic redundant architecture, the image processing unit does not have a traditional main backup, and both the main power supply and distribution unit and the backup power supply and distribution unit can supply power to the image processing unit. When the magnetic latching relay REL1 in the main power supply and distribution unit keeps the contacts 3 and 9 connected with 1 and 7, the 5V power output of U2 will be connected to the power input of the image processing unit 1; at this time, if the backup power supply and distribution unit is powered on and the backup relay REL1 is turned on, when the main power supply and distribution unit is not powered on, the input end of the main 8-way AD converter U3 will have the voltage input of the backup power module U2, forming a sneak path and damaging the device.

[0071] Step 5.2, for the above problem, Figure 4 The principle block diagram of the relay-based switch circuit in the onboard real-time information processing and power distribution system with dynamic redundant architecture is given. Figure 4 and Figure 3 The same parts in the above examples include the negative current driver, AD converter, the working principle of the magnetic latching relay and the 12V power supply, which will not be described here. Figure 4 Compared to Figure 3 The difference:

[0072] Figure 4The main power supply and distribution unit in the embodiment includes n DC-DC power supply modules 50 and n relay-based power supply and distribution switch circuits 60. Figure 4 Only two power modules, two magnetic latching relays and peripheral circuits are listed; the backup power distribution unit is exactly the same as the main one.

[0073] Taking the magnetic latching relay REL1 as an example, the main relay REL1 can receive both the main 12V power supply and the backup 12V power supply; it can receive both the main relay excitation pulse and the backup relay excitation pulse. That is: the main 12V power supply A_VCC12V0_REL is connected to the solder joint 2 and solder joint 5 of the relay REL1 through diodes D1 and D3 respectively; the backup 12V power supply B_VCC12V0_REL is connected to the solder joint 2 and solder joint 5 of the relay REL1 through diodes D2 and D4 respectively; the main 12V power supply A_VCC12V0_REL and the backup 12V power supply B_VCC12V0_REL are isolated by a switch diode to prevent sneak paths. At the same time, the control signals A_CK_POWEN_CL1 and A_CK_POWOFF_CLI given by the main measurement, control and configuration management unit are connected to the welding points 8 and 6 of the relay REL1 through the current limiting resistors R1 and R3 respectively through the outputs of the negative current driver A_DY_FR_CK_POWEN_CL1 and A_DY_FR_CK_POWOFF_CLI; the control signals B_CK_POWEN_CL1 and B_CK_POWOFF_CLI given by the standby measurement, control and configuration management unit are connected to the welding points 6 and 8 of the relay REL1 through the current limiting resistors R4 and R2 respectively through the backplane after the outputs of the negative current driver B_DY_FR_CK_POWEN_CL1 and B_DY_FR_CK_POWOFF_CLI. The specific implementation method of the relay REL1 power supply and distribution switch circuit (60) being able to power on and off the image processing unit 1 is as follows:

[0074] The main power supply and distribution unit relay REL1 and the backup power supply and distribution unit relay REL1 are equivalent to being connected in parallel, the welding points 1 and 7 of the main REL1 are connected with the welding points 4 and 10 of the backup REL1; the welding points 4 and 10 of the main REL1 are connected with the welding points 1 and 7 of the backup REL1. When A_CK_POWEN_CL1 initiates a pulse signal, A_DY_FR_CK_POWEN_CL1 is converted into a negative pulse with an amplitude of 12V, driving the coil to generate magnetic force. At this time, solder points 3 and 9 of the main REL1 are connected to solder points 1 and 7, and solder points 3 and 9 of the standby REL1 are connected to solder points 4 and 10, thereby supplying the 5V power supply of the main U2 to the image processing unit 1; when A_CK_POWOFF_CL1 initiates a pulse signal, A_DY_FR_CK_POWOFF_CL1 is converted into a negative pulse with an amplitude of 12V, driving the coil to generate magnetic force. At this time, solder points 3 and 9 of the main REL1 are connected to solder points 4 and 10, and solder points 3 and 9 of the standby REL1 are connected to solder points 1 and 7, then the image processing unit 1 is in a power-off state. When B_CK_POWEN_CL1 initiates a pulse signal, B_DY_FR_CK_POWEN_CL1 is converted into a negative pulse with an amplitude of 12V, driving the coil to generate magnetic force. At this time, solder points 3 and 9 of the main REL1 are connected to solder points 4 and 10, and solder points 3 and 9 of the standby REL1 are connected to solder points 1 and 7, thereby supplying the 5V power supply of the standby U2 to the image processing unit 1; when B_CK_POWOFF_CL1 initiates a pulse signal, B_DY_FR_CK_POWOFF_CL1 is converted into a negative pulse with an amplitude of 12V, driving the coil to generate magnetic force. At this time, solder points 3 and 9 of the main REL1 are connected to solder points 1 and 7, and solder points 3 and 9 of the standby REL1 are connected to solder points 4 and 10, then the image processing unit 1 is in a power-off state.

[0075] The relay REL1 contacts of the main and standby power distribution units switch simultaneously: when the main power distribution unit is working, the main and standby relays REL1 can receive the pulse signal from the main measurement and control and configuration management unit, so that the relay contacts are linked; when the standby power distribution unit is working, the main and standby relays REL1 can receive the pulse signal from the standby measurement and control and configuration management unit, so that the relay contacts are linked. Figure 3 Abnormal conditions in the system cause hidden path problems.

[0076] The embodiments of the present disclosure are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present disclosure should be included in the scope of protection of the present disclosure.

Claims

1. A power supply and distribution system for a real-time information processing system on a satellite, characterized in that: The system comprises: The invention comprises a short circuit protection circuit (10), a surge suppression circuit (20), an onboard real-time processing system switch circuit (30) based on a magnetic latching relay, an EMI filter (40), a DC-DC power supply module (50), a power supply and distribution switch circuit (60) based on a relay, a DC-DC power supply module (70) and a DC-DC power supply module (80).

2. The system according to claim 1, characterized in that The system adopts the traditional cold standby mode, including two sets of power supply and distribution units, the main and backup have no electrical connection and are physically completely isolated. When the preset requirements are met, the satellite starts the main part of the onboard real-time information processing system, that is, the main power supply and distribution unit works; The backup will only be activated as a fault plan when the main copy of the onboard real-time information processing system fails to meet the preset requirements in orbit.

3. The system according to claim 1, characterized in that The short-circuit protection circuit (10) adopts the method of connecting a fuse branch in series with a current-limiting resistor, which is composed of R1, R2, F1, F2, F3 and F4. The parallel equivalent resistance of R1 and R2 should be greater than 10 times the equivalent resistance of the fuse. The rated working current of the selected fuse should meet the following requirements: (I M ×2)<I 熔断器 <(I M +7), Among them, I M is the maximum rated operating current of the onboard real-time information processing system, I 熔断器 is the rated current of the selected fuse.

4. The system according to claim 1, characterized in that The surge suppression circuit (20) is composed of capacitors C1, C2, C3, C4, resistors R3, R4, R5, R6, and P-channel MOSFET tubes Q1, Q2, Q3.

5. The system according to claim 2, characterized in that The on-board real-time processing system switch circuit (30) based on the magnetic latching relay is the switch of the entire system: when the "power on" instruction is responded, the magnetic latching relay is in the open state, and the entire system works normally as long as the 42V primary bus is powered on; when the "power off" instruction is responded, the relay is in the open state, and the entire system does not work; the "power on" and "power off" instructions are both OC gate instructions, 80ms pulse, and low level is effective; The on-board real-time processing system switch circuit (30) based on magnetic latching relay adopts the measures of connecting diodes D1 and D2 in series, connecting diodes D3 and D4 in series, and connecting resistors R7 and R8 in parallel. The diodes are high-voltage resistant, planar silicon switch diodes; the resistors are metal film resistors, the resistance value is less than 1 / 10 of the equivalent resistance value of the relay, and the power is not more than 0.25W.

6. The system according to claim 5, characterized in that The on-board real-time processing system switch circuit (30) based on the magnetic latching relay comprises, when in an on-state: Step 1, the power supply and distribution unit receives a 42V power supply from the primary bus and protects the primary bus on the star through a short-circuit protection circuit (10); Step 2, the bus current flows into the surge suppression circuit (20) after passing through step 1; Step 3, the current is input into the EMI filter (40) after passing through step 2, wherein the EMI filter (40) comprises: an EMI filter 1 and an EMI filter 2; Step 4: After passing through the EMI filter 1, the bus current is input into a DC-DC power module (70) and n DC-DC power modules (50); after passing through the EMI filter 2, the current is input into a DC-DC power module (80) and mn DC-DC power modules (50).

7. The system according to claim 1, characterized in that The number x of EMI filters (40) required is: x≥42×2×I M / IN EMI , Among them, I M is the maximum rated operating current of the onboard real-time information processing system, W EMI is the rated output power of the selected EMI filter.

8. The system according to claim 2, characterized in that The DC-DC power supply module (70) converts the 42V bus power supply into a 5V secondary power supply, and directly supplies power to the power supply and distribution unit and the measurement, control and configuration management unit without the need for a relay switch; wherein the measurement, control and configuration management unit includes 1553B, system telemetry and remote control, image processing unit power on and off control, and health status management functions; The DC-DC power supply module (80) converts the 42V power supply into a 12V power supply to provide power to the relay-based power supply and distribution switch circuit (60); The DC-DC power supply module (50) converts 42V power into 5V power output, and supplies power to each image processing unit through a separate relay-based power supply and distribution switch circuit (60). When the relay is turned on, the 5V power output by the DC-DC power supply module (50) can ensure the normal operation of the corresponding image processing unit; when the relay is turned off, the 5V power output by the DC-DC power supply module (50) cannot supply power to the corresponding image processing unit.

9. The system according to claim 8, characterized in that The relay-based power supply and distribution switch circuit (60) comprises: a negative current driver, an AD converter, a magnetic latching relay and a 12V power supply; Among them, the main magnetic latching relay REL1 can receive power from both the main 12V power supply and the backup 12V power supply; it can receive both the main magnetic latching relay excitation pulse and the backup magnetic latching relay excitation pulse.

10. The system according to claim 9, characterized in that Powering each image processing unit through a separate relay-based power distribution switch circuit (60) includes: The main power distribution unit relay REL1 and the backup power distribution unit relay REL1 are equivalent to being connected in parallel, the welding points 1 and 7 of the main REL1 are connected with the welding points 4 and 10 of the backup REL1; the welding points 4 and 10 of the main REL1 are connected with the welding points 1 and 7 of the backup REL1; When A_CK_POWEN_CL1 initiates a pulse signal, A_DY_FR_CK_POWEN_CL1 is converted into a negative pulse with an amplitude of 12V, driving the coil to generate magnetic force. At this time, the solder joints 3 and 9 of the main REL1 are connected to the solder joints 1 and 7, and the solder joints 3 and 9 of the standby REL1 are connected to the solder joints 4 and 10, thereby supplying the 5V power supply of the main U2 to the image processing unit 1; When A_CK_POWOFF_CL1 initiates a pulse signal, A_DY_FR_CK_POWOFF_CL1 is converted into a negative pulse with an amplitude of 12V, driving the coil to generate magnetic force. At this time, the solder joints 3 and 9 of the main REL1 are connected to the solder joints 4 and 10, and the solder joints 3 and 9 of the standby REL1 are connected to the solder joints 1 and 7, and the image processing unit 1 is in a power-off state; When B_CK_POWEN_CL1 initiates a pulse signal, B_DY_FR_CK_POWEN_CL1 is converted into a negative pulse with an amplitude of 12V, driving the coil to generate magnetic force. At this time, the solder joints 3 and 9 of the main REL1 are connected to the solder joints 4 and 10, and the solder joints 3 and 9 of the standby REL1 are connected to the solder joints 1 and 7, thereby supplying the 5V power supply of the standby U2 to the image processing unit 1; When B_CK_POWOFF_CL1 initiates a pulse signal, B_DY_FR_CK_POWOFF_CL1 is converted into a negative pulse with an amplitude of 12V, driving the coil to generate magnetic force. At this time, the solder joints 3 and 9 of the main REL1 are connected to the solder joints 1 and 7, and the solder joints 3 and 9 of the backup REL1 are connected to the solder joints 4 and 10, then the image processing unit 1 is in a power-off state.

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