Manned spacecraft distributor circuit modeling method based on new-generation distribution switch

Abstract

The invention discloses a manned spacecraft distributor circuit modeling method based on a new generation power distribution switch, and belongs to the field of spacecraft system simulation. According to requirements of system energy matching simulation, the method realizes simulation of working steady-state characteristics and a dynamic process of the distributor by establishing a contactor switch module, an SSPC intelligent switch module and a signal interface module, and adopts a modular modeling method to realize simulation of the working steady-state characteristics and the dynamic process of the distributor. On the basis of an established contactor switch module, an SSPC intelligent switch module and a signal interface module, a power distributor model is constructed according to system construction, and can be used for accurately simulating complex characteristics of a novel power distributor.

Description

Technical Field

[0001] The present invention relates to a method for modeling a power distribution circuit of a manned spacecraft based on a new generation of power distribution switches, belonging to the technical field of spacecraft system simulation. Background Art

[0002] The power distribution system is an important part of a manned spacecraft. The combined spacecraft first adopts a 100V high-power intelligent power distribution system, with a power distribution power of more than 30KW and more than 1000 power distribution channels. The power distribution equipment has functions such as high-power breaking, I2T overcurrent protection, and information interface. The design of the power distribution system is one of the key technologies for the new generation of manned spacecrafts. During the entire process of in-orbit flight, a power distributor is required to provide load power supply and power-on / off control. For multi-layer power distribution systems and new power distribution protection functions, higher requirements are put forward for the matching adaptability of the energy system and the load protection characteristics, and overall design needs to be supported by simulation analysis.

[0003] The energy system simulation of a manned spacecraft uses an electrical system model based on professional circuit simulation software. In the matching simulation, the energy system model includes a power supply system model, a power distribution system model, and a load model constructed based on the device circuit design scheme, which together form a power supply system model capable of automatic closed-loop control, accurately simulating the shunt power supply control in the sunny area and the bus control process in the shadow area. The power distributor model is an important part of system-level modeling. The power distributor model needs to provide the steady-state electrical characteristics of the power distributor, realize power transfer, load breaking control, voltage drop simulation, etc., and also needs to provide functions such as high-power breaking, I2T overcurrent protection, and information interface. When event-driven, it needs to provide dynamic characteristics within the ms time scale of the system, which is the difficulty in the design of the power distributor model.

[0004] Some scholars in the electrical design field and the aviation design field have carried out modeling and simulation related to power distribution, but they are significantly different from the architecture, functions, and design parameters of aerospace system power distribution equipment and cannot be applied to spacecraft simulation.

[0005] Currently, the spacecraft system simulation is in its infancy, and there are few relevant literatures on power distribution simulation modeling. There is a patent that proposes a method and system for fusing the large diagram of spacecraft power supply and distribution and energy simulation data. By establishing an energy simulation model library that matches and correlates with the drive parameters of entity objects in the large diagram of spacecraft power supply and distribution, simulation data is collected according to the single-step solution step size, and automatically fused, discriminated, and adjusted, and attached to the display objects of the power supply and distribution large diagram to achieve the information fusion of the spacecraft power supply and distribution large diagram and energy simulation data. However, it does not give the modeling method of the power distribution system and equipment. At the same time, for the new power distributor product, which is a key technology research and development for the design and use of intelligent power distributors, its electrical characteristics have no similar products in domestic aerospace in the past. Summary of the Invention

[0006] The technical problem to be solved by the present invention is: overcoming the deficiencies of the prior art, a method for modeling the power distribution circuit of a manned spacecraft based on a new generation of power distribution switches is proposed. By establishing an integrated model of power supply and information control of the power distribution unit, the simulation of the steady-state characteristics and dynamic processes of the power distribution unit is realized.

[0007] The technical solution of the present invention is:

[0008] A method for modeling the power distribution circuit of a manned spacecraft based on a new generation of power distribution switches, comprising:

[0009] Modularly dividing the power distribution unit according to the board and circuit design to form multiple types of independent modules and interfaces, including contactor switch modules, SSPC intelligent switch modules, and signal interface modules;

[0010] Modeling the contactor switch for power distribution bus control to obtain a contactor switch module;

[0011] Modeling the SSPC intelligent switch for power consumption of the power distribution unit load to obtain an SSPC intelligent switch module;

[0012] Modeling the signal interface of the power distribution unit to obtain a power distribution unit signal interface module;

[0013] According to the internal circuit design of the power distribution unit, configure the corresponding number of contactor switch modules and SSPC intelligent switch modules, and connect each contactor switch module and SSPC intelligent switch module to the power distribution unit signal interface module respectively;

[0014] According to the external interface of the power distribution unit, establish the power supply interface and information interface between the power distribution unit and the outside to obtain a power distribution unit model;

[0015] Test the power distribution unit model by simulating external power supply and external load, and form a usable power distribution unit model after the function and performance parameters are qualified.

[0016] Furthermore, modeling the contactor switch for power distribution bus control to obtain a contactor switch module, including a coil drive circuit, an instruction hold control circuit, and a power path circuit;

[0017] The coil drive circuit receives an external voltage pulse drive signal and outputs a conversion control signal to the instruction hold control circuit;

[0018] The instruction hold control circuit receives the conversion control signal, transforms the conversion control signal into a stable switch control signal and sends it to the power path circuit;

[0019] The power path circuit performs on-off actions according to the requirements of the switch control signal to realize the connection and disconnection control of the power supply bus.

[0020] Further, the power path circuit includes a power supply bus interface circuit and a main power switch; among them, the main power switch selects a two-state switch sw model, sets the on-impedance and off-impedance, the impedance when turned on is not greater than 10 mΩ, and the impedance when turned off is greater than 1 MΩ.

[0021] Further, the coil drive circuit includes a switch-on coil drive circuit, a switch-off coil drive circuit, and a coil drive interface circuit; the coil drive interface circuit receives a voltage pulse drive signal and sends it to the switch-off coil drive circuit or the switch-on coil drive circuit, which is converted into an on / off switch control signal in pulse form; among them, the switch-on coil drive circuit and the switch-off coil drive circuit set the impedance and inductance of the coil, match the characteristics of the real circuit, and can respond to ms-level pulse commands.

[0022] Further, the on-impedance characteristics, switch-on action characteristics, and switch-off action characteristics of the contactor switch module are corrected by comparing the simulation results with the measured results of the electrical working conditions, and the best simulation parameters are determined by matching the measured parameters.

[0023] Further, an SSPC intelligent switch for the load power consumption of the distributor is modeled to obtain an SSPC intelligent switch module, including a power path circuit, a digital instruction to analog control circuit, and a MOS transistor drive circuit;

[0024] The power path circuit is provided with an SSPC power channel circuit composed of MOS transistors to simulate the characteristic process of the on-time in the time level of us to ms;

[0025] The MOS transistor drive circuit receives the control signal given by the digital instruction to analog control circuit, generates a drive signal and outputs it to the SSPC power channel circuit;

[0026] The digital instruction to analog control circuit includes an external signal receiving circuit, an inverse time feedback calculation circuit, and a signal instruction processing circuit; the external signal receiving circuit receives an external control instruction; the signal instruction processing circuit converts the external control instruction into an on / off control signal of the switch, and synchronously receives the output result of the inverse time feedback calculation circuit, and synthesizes the two input control sources to form a control signal for the MOS transistor drive circuit; the inverse time feedback calculation circuit uses a current sampling device to obtain the current data of the power path circuit, converts it into a data signal for calculation, and calculates the integral parameter and sends it to the signal instruction processing circuit.

[0027] Further, the power path circuit of the SSPC intelligent switch module includes a power interface circuit and an SSPC power channel circuit; the power interface circuit satisfies the input of the interface voltage of 0 - 100V, and the SSPC power channel circuit is formed by connecting 4 power MOS transistor devices in parallel and then connecting 1 resistor in series.

[0028] Further, model the signal interface of the distributor to obtain a distributor signal interface module. The distributor signal interface module adopts a digital equivalent circuit model to simulate the transmission and conversion characteristics of the bus control signal, and realizes receiving a control instruction and converting the control instruction into an on / off control signal for the corresponding channel switch.

[0029] Further, the on / off control signals output by the distributor signal interface module include:

[0030] The dev-id-sig interface signal, as a gating control signal for the distributor device. Only when the value of this signal is set to the value of the distributor device code number, can the distributor be driven to perform an action;

[0031] The sw-id-sig interface signal, as a control signal for a certain switch channel under the distributor. Only when the value of the specified switch serial number is instructed, can the control signal corresponding to the switch serial number be effective;

[0032] The sw-state interface signal, as a setting signal for turning on or off a certain switch. When different agreed values are sent, the turn-off or turn-on signal is effective;

[0033] Establish drive signals for each switch. Each switch has one on signal and one off signal.

[0034] The advantages of the present invention compared with the prior art are as follows:

[0035] (1) The high-power contactor switch is a new type of high-power power distribution switch for bus control of the distributor. The present invention uses a method of simulating physical structure and electrical characteristics for modeling to solve the simulation of the on / off state, on / off response time, and on characteristics of the contactor switch model.

[0036] (2) The SSPC intelligent switch is the core switch for the load power consumption of the distributor. It is a complex power electronic circuit with an I2T automatic overcurrent protection characteristic in different grades. It is an important module for composing the distributor model. The present invention proposes a modeling method for the SSPC intelligent switch to realize its core characteristics such as steady-state power supply characteristics, switching characteristics, on / off response time, and I2T protection curve.

[0037] (3) The distributor adopts a new type of bus communication control, which is the main module for realizing the control of the distributor. Its characteristics are complex and there are many parameters. It is necessary to solve the modeling technology of signal interface control. The present invention proposes a new signal interface modeling method for the distributor to realize the characteristics of receiving signals from the upstream controller and performing actions according to instructions. Description of the Drawings

[0038] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become apparent to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present invention. Also, throughout the drawings, the same reference numerals are used to denote the same components. In the drawings:

[0039] Figure 1 Schematic diagram of the high-power contactor switch model in the embodiment of the present invention;

[0040] Figure 2 Schematic diagram of the command holding control circuit of the high-power contactor switch model in the embodiment of the present invention;

[0041] Figure 3 Schematic diagram of the SSPC intelligent switch model in the embodiment of the present invention;

[0042] Figure 4 Schematic diagram of the new signal interface model of the distributor in the embodiment of the present invention;

[0043] Figure 5 Screenshot of the signal control design of the new signal interface model of the distributor in the embodiment of the present invention;

[0044] Figure 6 Schematic diagram of the principle of the distributor model in the embodiment of the present invention;

[0045] Figure 7 Schematic diagram of the internal partial connection of the distributor model in the embodiment of the present invention;

[0046] Figure 8 Schematic diagram of the connection of the distributor model in the embodiment of the present invention. Detailed implementation manners

[0047] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be completely conveyed to those skilled in the art.

[0048] The present invention proposes a method for modeling the electrical circuit of a distributor for a manned spacecraft based on a new generation of distribution switches. Through modular modeling, on the basis of establishing a high-power contactor switch module, an SSPC intelligent switch module, and a new signal interface module of the distributor, an integrated model for power supply and information control of the distributor is constructed according to the system architecture, as Figure 6 shown.

[0049] (1) Modeling of high-power contactor switches

[0050] The high-power contactor switch is a newly developed and used component for the first time in aerospace, and there was no available circuit model before. This model is a modular model executed by command signals, turn-on, and turn-off. Among them, the command signal interface component receives external commands and converts them into pulse control signals to be transmitted to the turn-on and turn-off execution components. The turn-on and turn-off execution components receive the pulse control signals provided by the command signal interface component, and after conversion, drive the switch component to act, enabling the power interface to generate on or off equivalent characteristics.

[0051] The model needs to comprehensively consider the steady-state and dynamic characteristics of the switch, and realize the simulation of its own action characteristics and external drive characteristics through an accurate analog and digital hybrid circuit model. Each high-power contactor switch module includes a power path circuit, a command hold control circuit, and a coil drive circuit. The coil drive circuit receives the external voltage pulse drive signal of the module and outputs a conversion control signal to the command hold control circuit. The command hold control circuit converts the conversion control signal into a stable switch control signal, and the switch control signal is output to the power path circuit. The power path circuit performs turn-on and turn-off actions according to the requirements of the switch control signal. As Figure 1 shown, the method for establishing the model is as follows:

[0052] 1) Power path circuit

[0053] The power path circuit performs turn-on and turn-off actions according to the requirements of the switch control signal: it always remains on after receiving the turn-on pulse command and always remains off after receiving the turn-off pulse command.

[0054] The power path circuit includes a positive power supply line interface, a power supply return line interface circuit, and a main power switch model. Among them, the main power switch model selects a two-state switch sw model, and sets the on impedance and off impedance. The impedance values are set according to the actual characteristics of the device. The impedance during turn-on is not greater than 10 mΩ, and the impedance during turn-off is greater than 1 MΩ. The turn-on action time and turn-off action time are set according to the actual characteristics of the device, and can be accurate to the ms level.

[0055] 2) Coil drive circuit

[0056] It is composed of a diode, a resistor, an inductor, and a voltage conversion module, receives the external voltage pulse drive signal of the module, and outputs a conversion control signal to the command hold control circuit. The coil drive circuit includes a switch-on coil drive circuit, a switch-off coil drive circuit, and a coil drive interface circuit.

[0057] Establish a switch-on coil drive circuit, set the impedance and inductive reactance of the coil to match the actual circuit characteristics, and be able to respond to real ms-level pulse commands.

[0058] Establish a switch-off coil drive circuit, set the impedance and inductive reactance of the coil to match the actual circuit characteristics, and be able to respond to real ms-level pulse commands.

[0059] Build a coil drive interface circuit to introduce an external drive control signal.

[0060] 3) Instruction holding control circuit

[0061] The instruction holding control circuit is the core circuit that simulates the magnetic holding characteristics of the analog switch device. Different from the general direct instruction drive characteristics, in order to simulate the instruction state holding characteristics of the real circuit, the instruction holding control circuit receives the conversion control signal given by the coil drive circuit and converts it into a holding control signal for the switch device in the power path circuit, that is, it receives the on or off pulse voltage signal but outputs a stable on or off switch control signal, and sends the processed switch control signal to the power path circuit.

[0062] Build the drive logic for the turn-on execution signal and the turn-off execution signal, which are connected in sequence using buf devices and norlatch logic devices to form a turn-on or turn-off signal time-sharing drive switch SW model, as Figure 2 shown. From the CLOSE and OPEN signals to the output of the comparator comp device is the coil drive circuit; from the input of the op-amp buf device to the output of the nrlch device is the instruction holding control circuit; from SWP\SWM and the sw switch device constitute the power path circuit.

[0063] Build the external input turn-on and turn-off signal interfaces, CLOSE and OPEN respectively;

[0064] The specific parameters of the switch circuit are designed according to the impedance of different types of interface circuits and the characteristics of control pulses respectively, and switch models of the same series but different models can be generated.

[0065] The characteristics of the high-power contactor switch need to reflect the on-resistance characteristic, the switch turn-on action characteristic, and the switch turn-off action characteristic. All three characteristics will affect the actual working state. Therefore, a method of correcting the model characteristics by comparing the simulation results with the measured results of the electrical working conditions is adopted, and the best simulation parameters of the system characteristics are found by matching the measured parameters.

[0066] (2) SSPC intelligent switch modeling

[0067] The SSPC intelligent switch is a newly developed and used component for the first time in aerospace, and there was no available circuit model before. To comprehensively simulate its dynamic and steady-state characteristics, solve the simulation problems of the switch's on characteristics, off characteristics, normal on-off operation process characteristics, automatic overcurrent protection characteristics, and signal interface, an SSPC modeling scheme based on the MOS circuit of the switching tube + the equivalent model of the overcurrent protection characteristics was proposed. Using the hybrid modeling method of analog circuit + digital circuit, a switch model composed of the MOS tube drive circuit, power path circuit, and digital instruction to analog control circuit was constructed. To achieve accurate and easy-to-debug MOS circuit control, the signal control and drive circuit adopted the drive circuit design method combining analog and digital signals, the MOS circuit adopted the basic device design method, and the digital instruction to analog control circuit adopted the method of analog acquisition and output + digital calculation. The switch action time reaches the ms level, the circuit building accuracy is at the component level, and the current detection accuracy is better than 0.1A. The fitting situation of the I2T curve is shown in Table 3.

[0068] To effectively establish a model for simulating real characteristics, the model needs to comprehensively consider the steady-state and dynamic characteristics of the SSPC switch, the corresponding characteristics of overcurrent protection calculation, and simulate its own action characteristics and external drive characteristics through an accurate analog and digital hybrid circuit model. Each switch includes a power path circuit, a digital instruction to analog control circuit, and a MOS tube drive circuit. The digital instruction to analog control circuit receives the external control instruction of the module and outputs the execution control signal to the MOS tube drive circuit. The MOS tube drive circuit forms a drive signal to the power path circuit. As Figure 3 shown, the circuit from the vsource_vc1 device to the 100-ohm r1 resistor area is the MOS tube drive circuit. Four MOSs and the series-connected 13.5-ohm r3 resistor are the power channel circuit; the output from the current sensor sense-current-3p1 device to the var2v device is the digital instruction to analog control circuit. The method of establishing the model is as follows:

[0069] 1) Power channel circuit

[0070] To achieve dynamic change characteristics, the circuit is modeled according to the multi-MOS tube parallel topology of the real circuit, which can reflect the characteristic process simulation of the on process from us to ms.

[0071] Establish a real power interface circuit that can meet the input of the 0-100V interface voltage.

[0072] Build an SSPC power channel model. After selecting 4 power MOSFET devices in parallel and then connecting 1 resistor model in series. The characteristics of MOSFETs have a great impact on the simulation accuracy. They should be built according to the characteristics of actual devices. The parameters such as breakdown voltage and current capacity VDS / VDG / VGS / ID / IS, gate threshold voltage VGS(th), static drain-source on-resistance RDS(on), drain-source breakdown voltage BVDSS, diode forward voltage VSD, zero-gate-voltage drain current IDSS, rise time tr, fall time tf, reverse recovery time trr, etc. should be the same as those of the real product or the error should be less than 10%.

[0073] 2) Driver circuit

[0074] Build a MOSFET driver circuit. According to the MOSFET interface driving principle, it receives the control signal given by the digital instruction conversion analog control circuit, generates an on-voltage signal and an off-voltage signal, and outputs them to the SSPC power channel circuit.

[0075] The MOSFET driver circuit consists of 2 MOSFETs, 1 resistor, and 1 capacitor to form a driver circuit, and is connected according to the actual situation that 1 signal controls 4 MOSFETs simultaneously.

[0076] 3) Digital instruction conversion analog control circuit

[0077] Build an external signal receiving circuit that can receive external control instructions.

[0078] Build an inverse time feedback calculation circuit. Use 1 current sampling device to obtain the power path current data, convert it into a data signal for calculation, and through the inverse time calculation device PROP-INT, calculate the integral parameters according to the time limit requirements in Table 3.

[0079] Build a signal instruction processing circuit. Convert the external control instruction into an on-off control signal for the switch, and simultaneously receive the output result used by the inverse time feedback calculation circuit. Integrate the two input control sources to form an effective control signal for the MOSFET driver circuit. Use an OR logic device to output the integral control signal device, the external control signal CONTROL device, and the voltage conversion device var2v to convert the output signal of the OR logic device into a control signal for the VCVS device.

[0080] (3) Modeling of the new signal interface of the distributor

[0081] The distributor adopts a new type of bus communication control. The function of the bus control is the core module for realizing the control of the distributor. However, the signal characteristics such as its bus communication protocol are not the focus of the distribution simulation. Therefore, a digital equivalent circuit model is used to simulate the transmission and conversion characteristics of the control signal, such as Figure 4 shown, to realize the characteristics of receiving the signal from the upstream controller and performing actions according to the instructions.

[0082] Establish an external interface signal control logic, such as Figure 5 shown, including:

[0083] Establish a dev-id-sig interface signal as the gating control signal for a certain power distribution device. Only when the signal value set by the system is equal to the device code value can the device be driven to execute an action;

[0084] Establish a sw-id-sig interface signal as the control signal for a certain switch channel under the power distribution device. Only the control signal corresponding to the switch serial number with the specified serial number value in the instruction is valid;

[0085] Establish a sw-state interface signal as the setting signal for turning a certain switch on or off. When sending 1, the turn-off signal is valid; when sending 0, the turn-on signal is valid.

[0086] Establish a signal instruction processing circuit:

[0087] Establish the drive signal for each switch. Each switch has one turn-on and one turn-off signal; for example, K1N_C, K1N_O;

[0088] Set the signal transmission and conversion time to be less than 1 ms.

[0089] Through the present invention, a method for modeling the power distribution circuit of a manned spacecraft based on a new generation of power distribution switch devices is proposed, realizing the accurate simulation of the complex characteristics of the new power distribution device, forming a bus power distribution device and a load power distribution device model based on a professional circuit simulation software, accessing the spacecraft system energy circuit simulation system, and performing simulations on the power distribution function, power distribution performance, and overcurrent protection performance of the power supply system model and the load model to obtain the key parameter data for the energy management and distribution of the combined spacecraft and successfully applying them to the system engineering design. The ground special tests of the model show that the simulated parameter data are accurate and reasonable, ensuring the success of the on-orbit power distribution mission, especially ensuring the on-orbit safety of the spacecraft and bringing important social benefits.

[0090] For the energy management and distribution simulation of the energy system, traditional domestic and foreign simulations are generally system module function logic simulations, mathematical model simulations, or single-circuit level simulations, lacking a system-level circuit simulation system based on key components. A certain combined spacecraft first established an energy system power supply circuit simulation system among domestic spacecraft, effectively supporting the verification of various energy management strategies, reducing the actual verification conditions of the engineering model by 30%, and reducing a large amount of engineering development and implementation costs.

[0091] At the same time, due to the use of modular modeling ideas, the invented distributor model is applicable to the power distribution modeling and system simulation of other spacecrafts using the same component models, can directly support designers in the design of energy systems, and has good economic benefits and promotion prospects.

[0092] Table 1 Comparison of Model and Experimental Results - Bus Distributor

[0093] Serial number Key parameter Simulation result Measured / designed data Precision deviation 1 Switching operation time 1 ms 1.01 ms Better than 1% 2 Interface control signal 28 V pulse for 80 ms 24 - 32 V pulse for 80 ms Consistent 3 On - resistance 1 mΩ Less than 1 mΩ Better than 1%

[0094] Table 2 Comparison of Model and Experimental Results - Load Distributor

[0095]

[0096]

[0097] Table 3 Design Values and Simulation Values of Overcurrent Protection Parameters for SSPC Intelligent Switch

[0098] Over - current multiple Design lower limit value (ms) Theoretical value (ms) Design upper limit value (ms) Simulation value (ms) 1.6 times 1714.7 2553.9 4937.3 2500 2 times 800 1000 1200 1000 2.5 times 449.5 539.9 623.4 500 3 times 293.6 348 396.8 330 3.5 times 208.5 245.5 278.2 240 4 times 156.3 183 207 180 5 times 97.7 114.1 128.4 120 6 times 67 78 87.7 85 7 times 48.9 57 63.8 50

[0099] The following further illustrates the present method through specific embodiments:

[0100] (1) Modeling of High-Power Contactor Switch

[0101] The high-power contactor switch is a newly developed and used component for the first time in the aerospace field, and there was no available circuit model in the past. The characteristics of the high-power contactor switch need to reflect the on-resistance characteristic, switch-on action characteristic, and switch-off action characteristic, and all three characteristics will affect the actual working state. Therefore, a method of correcting the model characteristics by comparing the simulation results with the measured results of the electrical working conditions is adopted, and the best simulation parameters for the system characteristics are found by matching the measured parameters. The specific construction method is as follows:

[0102] Build an instruction-holding control circuit, establish a dual-terminal interface for the 28V pulse control signal, and give the instruction signal and 28V power supply signal;

[0103] Establish a power path circuit model, set the contact resistance: not greater than 0.5 mΩ; action time: not greater than 50 ms;

[0104] Build a coil drive circuit (on and off execution components), establish the action execution component of the contactor, receive the 28V drive signal, convert it into a switch characteristic signal through the coil interface, and realize the on and off control of the 100V power supply bus. Set its action and steady-state characteristics, contact load capacity: 200A, 110Vdc, 5000 on-off cycles;

[0105] Establish a cable model, and connect the switch model and the signal interface model according to the topological structure of the high-power contactor switch to form a switch model;

[0106] (2) SSPC intelligent switch modeling

[0107] An SSPC modeling scheme based on the equivalent model of MOS circuit + overcurrent protection characteristics of switching tubes is proposed. Using the hybrid modeling method of analog circuit and digital circuit, a switch model composed of signal control and drive circuit, MOS circuit, and overcurrent protection circuit is constructed. The signal control and drive circuit adopts the drive circuit design method combining analog and digital signals, the MOS circuit adopts the basic device design method, and the overcurrent protection circuit adopts the method of analog acquisition and output + digital calculation. The switch action time reaches the millisecond level, the circuit building accuracy is at the component level, and the current detection accuracy is better than 0.1 A. The specific modeling process is as follows:

[0108] The digital instruction to analog control circuit is established. A digital interface is established to receive the signal instruction from the upstream controller, and a signal instruction processing circuit is established to convert the upstream instruction into the on-off control signal of the switch; the overcurrent protection calculation circuit is built. Through the acquisition of voltage and current analog signals, a digital circuit signal is formed and sent to the inverse time protection algorithm calculator for calculation, and the MOS switch drive control signal is output and sent to the SSPC module circuit;

[0109] The SSPC power path circuit is built. Based on the MOS circuit for modeling, the circuit is designed according to the real SSPC. The MOS tube circuit is designed to realize the switch control function, and the drive receiving circuit is designed to convert the control signal of the instruction signal interface component into the level voltage signal for MOS tube drive. The module circuit connection is built through the cable model;

[0110] The MOS tube drive circuit is built. According to the MOS tube interface drive voltage, the turn-on voltage signal and turn-off voltage signal are established.

[0111] (3) New signal interface modeling of the distributor

[0112] The model design scheme for the new signal interface modeling is as Figure 4 、 Figure 5 shown. The digital equivalent circuit model is adopted to simulate the transmission and conversion characteristics of the control signal, and the characteristics of receiving the signal from the upstream controller and executing actions according to the instruction are realized. The signal transmission and conversion time is better than the millisecond level. The new signal interface model of the distributor includes:

[0113] The external interface signal is established, and a digital interface is established to receive the signal instruction from the upstream controller;

[0114] The signal instruction processing circuit is established to convert the upstream instruction into the on-off control signal of the corresponding channel switch;

[0115] (4) Distributor modeling

[0116] After completing the modeling of the above three modules, according to the type of distributor to be established, it is clear that:

[0117] According to the design status of the distributor, configure the corresponding number of DC contactor modules and SSPC modules;

[0118] According to the internal circuit design of the distributor, connect each DC contactor module and SSPC module, as Figure 6 、 Figure 7 shown;

[0119] According to the external interface of the distributor, establish the power supply interface and information interface between the distributor and the outside;

[0120] By simulating external power supply and external load, test the distributor model. After passing the test, form a usable distributor model, as Figure 8 shown.

[0121] The above-described embodiments are only relatively preferred specific embodiments of the present invention. The ordinary changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for modeling a manned spacecraft power distribution circuit based on a new generation of power distribution switches, characterized in that: include: The distributor is modularized according to the board and circuit design to form multiple types of independent modules and interfaces, including contactor switch module, SSPC intelligent switch module, and signal interface module; Model the contactor switch of the distributor busbar control to obtain the contactor switch module; Model the SSPC intelligent switch for the power distribution load to obtain the SSPC intelligent switch module; Model the distributor signal interface to obtain a distributor signal interface module; According to the internal circuit design of the distributor, configure the corresponding number of contactor switch modules and SSPC intelligent switch modules, and connect each contactor switch module and SSPC intelligent switch module to the distributor signal interface module respectively; According to the external interface of the distributor, a power supply interface and an information interface between the distributor and the outside are established to obtain a distributor model; The distributor model is tested by simulating external power supply and external load, and a usable distributor model is formed after the functional and performance parameters are qualified.

2. The method for modeling a manned spacecraft power distribution circuit based on a new generation power distribution switch according to claim 1 is characterized in that: The contactor switch module includes a coil drive circuit, a command holding control circuit and a power path circuit; The coil driving circuit receives an external voltage pulse driving signal and outputs a conversion control signal to the instruction holding control circuit; The command holding control circuit receives the conversion control signal, converts the conversion control signal into a stable switch control signal and sends it to the power path circuit; The power path circuit performs opening and closing actions according to the switch control signal requirements to realize the connection and disconnection control of the power supply bus.

3. The method for modeling a manned spacecraft power distribution circuit based on a new generation power distribution switch according to claim 2 is characterized in that: The power path circuit includes a power supply bus interface circuit and a main power switch; wherein the main power switch selects a two-state switch sw model, sets the on impedance and the off impedance, the impedance when on is not greater than 10mΩ, and the impedance when off is greater than 1MΩ.

4. The method for modeling a manned spacecraft power distribution circuit based on a new generation power distribution switch according to claim 2 is characterized in that: The coil driving circuit includes a switch-on coil driving circuit, a switch-off coil driving circuit and a coil driving interface circuit; The coil drive interface circuit receives an external voltage pulse drive signal, forwards it to the switch-off coil drive circuit or the switch-on coil drive circuit, and generates a pulse-form on / off switch control signal; wherein, the switch-on coil drive circuit and the switch-off coil drive circuit set the impedance and inductance of the coil to match the actual circuit characteristics and can respond to ms-level pulse instructions.

5. The method for modeling a manned spacecraft power distribution circuit based on a new generation power distribution switch according to claim 2 is characterized in that: By comparing the simulation results with the measured results of electrical working conditions, the on-resistance characteristics, switch-on action characteristics, and switch-off action characteristics of the contactor switch module are corrected, and the optimal simulation parameters of the characteristics are determined by matching the measured parameters.

6. The method for modeling a manned spacecraft power distribution circuit based on a new generation power distribution switch according to claim 1 is characterized in that: The SSPC intelligent switch module includes a digital instruction to analog control circuit, a MOS tube drive circuit and a power path circuit; The digital instruction to analog control circuit includes an external signal receiving circuit, an inverse time feedback calculation circuit and a signal instruction processing circuit; the external signal receiving circuit receives an external control instruction; the signal instruction processing circuit converts the external control instruction into an on-off control signal of the switch, and synchronously receives the output result of the inverse time feedback calculation circuit, and combines the two input control sources to form a control signal for the MOS tube drive circuit; The inverse time feedback calculation circuit uses a current sampling device to obtain the current data of the power path circuit, converts it into a data signal for calculation, and calculates the integral parameter and sends it to the signal instruction processing circuit; The MOS tube driving circuit receives the digital instruction and converts it into the control signal given by the analog control circuit, generates a driving signal and outputs it to the SSPC power channel circuit; The power path circuit is provided with a SSPC power path circuit composed of MOS tubes, and the characteristic process of the turn-on process at the us~ms time level is simulated.

7. The method for modeling a manned spacecraft power distribution circuit based on a new generation power distribution switch according to claim 6 is characterized in that: The power path circuit of the SSPC intelligent switch module includes a power interface circuit and an SSPC power channel circuit; the power interface circuit meets the input of 0-100V interface voltage, and the SSPC power channel circuit includes 4 power MOS tube devices and 1 resistor. After the 4 power MOS tube devices are connected in parallel, a resistor is connected in series.

8. The method for modeling a manned spacecraft power distribution circuit based on a new generation power distribution switch according to claim 1 is characterized in that: The distributor signal interface module adopts a digital equivalent circuit model to simulate the transmission and conversion characteristics of the bus control signal, realize the reception of control instructions and convert the control instructions into on-off control signals of the corresponding channel switches.

9. The method for modeling a manned spacecraft power distribution circuit based on a new generation power distribution switch according to claim 1, characterized in that: The on / off control signals output by the distributor signal interface module include: The dev-id-sig interface signal is used as a gating control signal for the power distribution device. Only when the signal value is set to the value of the power distribution device code, the power distribution device can be driven to perform an action; The sw-id-sig interface signal is used as a control signal for a switch channel under the distributor. Only when the switch number value is specified by the instruction, the control signal of the corresponding switch number can be effective; The sw-state interface signal is used as a setting signal for turning a switch on or off. When different agreed values ​​are sent, the off or on signal is valid. The drive signal for each switch is established, and each switch has 1 on signal and 1 off signal.

Images