Pico-satellite power supply control method and device and power supply system

Abstract

The invention discloses a power supply control method and device for a pico-satellite and a power supply system, and relates to the field of pico-satellite power supply, and the power supply system comprises an electric energy initial module and an electric energy storage module as a reserve power supply, so as to guarantee reliable power supply for an on-satellite load under various conditions. The output voltage and the output current of the electric energy initial output module are obtained, and the conductance increment is determined based on the output voltage, the output current and the conductance calculated in the previous control period; according to the conductance increment and a preset control strategy, determining a target duty ratio used for controlling on and off of a controllable switch in the voltage conversion module in a next control period, so as to drive the controllable switch according to the target duty ratio, and further enable the output power of the electric energy initial output module to reach a preset maximum output power point; it is ensured that the electric energy initial output module always operates near the maximum power point, and electric energy resources are utilized to the maximum extent on the basis of adapting to the space environment to guarantee reliable power supply for loads on the satellite.

Description

Technical Field

[0001] The present invention relates to the technical field of pico satellite power supply, and in particular to a power supply control method, device and power supply system for a pico satellite. Background Art

[0002] Microsatellites, with their high functional density, advanced technical performance and high flexibility during launch and operation, have gradually become an important development direction in aerospace technology research. According to the current internationally accepted satellite classification method, microsatellites weighing between 0.1 and 1 kg can be called picosatellites. For microsatellites represented by picosatellites, since the area of ​​their solar panels is very limited and they face a complex and changeable space environment, how to provide an effective solution to achieve efficient and reliable power supply for various loads on picosatellites is a technical problem that needs to be solved urgently. Summary of the invention

[0003] In view of this, the present invention provides a power supply control method, device and power supply system for a pico-satellite, which is beneficial to maximize the use of electric energy resources on the basis of adapting to the space environment to ensure reliable power supply for on-board loads.

[0004] In order to solve the above technical problems, the present application provides a power supply control method for a pico satellite, which is applied to a control module in a power supply system of a pico satellite, wherein the power supply system further comprises an electric energy initial output module, a voltage conversion module and an electric energy storage module which are connected in sequence, wherein the voltage conversion module is used to perform voltage conversion to charge the electric energy storage module as a reserve power source and / or to supply power to each onboard load in the pico satellite, and the voltage conversion module comprises a controllable switch connected to the control module; the power supply control method for the pico satellite comprises:

[0005] Obtaining the output voltage and output current of the initial electric energy output module in the current control cycle;

[0006] Determining a conductance increment based on the output voltage, the output current, and the conductance calculated in the previous control cycle;

[0007] According to the conductance increment and the preset control strategy, the target duty cycle for controlling the on and off of the controllable switch in the next control cycle is determined, so as to drive the controllable switch according to the target duty cycle, thereby making the output power of the initial electric energy output module reach the preset maximum output power point.

[0008] Further, according to the conductance increment and the preset control strategy, determining a target duty cycle for controlling the on and off of the controllable switch in the next control cycle includes:

[0009] Fuzzify the conductance increment and the duty cycle adjustment step in the current control period respectively to obtain the fuzzy membership degree of the conductance increment and the fuzzy membership degree of the duty cycle adjustment step;

[0010] Perform fuzzy inference according to the fuzzy membership degree of the conductance increment, the fuzzy membership degree of the duty cycle adjustment step and the preset fuzzy rules to obtain the fuzzy membership degree of the duty cycle adjustment step corresponding to the next control period;

[0011] Defuzzify the fuzzy membership degree of the duty cycle adjustment step corresponding to the next control period according to the preset duty cycle adjustment step membership function and the defuzzification algorithm to obtain the duty cycle adjustment step corresponding to the next control period;

[0012] Based on the duty cycle corresponding to the current control period and the duty cycle adjustment step corresponding to the next control period, determine the target duty cycle for controlling the on and off of the controllable switch.

[0013] Further, fuzzifying the conductance increment and the duty cycle adjustment step in the current control period respectively to obtain the fuzzy membership degree of the conductance increment and the fuzzy membership degree of the duty cycle adjustment step includes:

[0014] Fuzzify the conductance increment in the current control period based on the preset conductance increment membership function to obtain the fuzzy membership degree of the conductance increment;

[0015] Fuzzify the duty cycle adjustment step in the current control period based on the preset duty cycle adjustment step membership function to obtain the fuzzy membership degree of the duty cycle adjustment step.

[0016] To solve the above technical problems, the present invention also provides a power supply control device for a nanosatellite, including:

[0017] A memory for storing computer programs;

[0018] A processor for implementing the steps of the power supply control method for the nanosatellite as described above when executing the computer program.

[0019] To solve the above technical problems, the present invention also provides a power supply system for a nanosatellite, including an initial power output module, a voltage conversion module and a power storage module connected in sequence, and further including the power supply control device for the nanosatellite as described above;

[0020] The voltage conversion module is used for voltage conversion to charge the power storage module as a reserve power source and / or supply power to each on-board load in the nanosatellite, and the voltage conversion module includes a controllable switch connected to the power supply control device.

[0021] Further, the voltage conversion module includes a primary bus boost circuit and N secondary bus buck circuits, where N is an integer not less than 1;

[0022] The input end of the primary bus boost circuit is connected to the output end of the initial power output module, and the output end of the primary bus boost circuit is respectively connected to the input end of the power storage module and the input ends of the secondary bus buck circuits; the primary bus boost circuit includes a first controllable switch connected to the power supply control device, so that the power supply control device controls the conduction and cutoff of the first controllable switch according to the determined target duty cycle;

[0023] The output end of the secondary bus buck circuit is connected to the power supply end of the load on the target satellite on the picosatellite, and the control end is connected to the power supply control device.

[0024] Further, the secondary bus buck circuit includes a second controllable switch and a buck control chip;

[0025] The first end of the second controllable switch is connected to the output end of the primary bus boost circuit, the second end is connected to the input end of the buck control chip, and the control end is connected to the power supply control device;

[0026] The output end of the buck control chip is connected to the power supply end of the load on the target satellite;

[0027] The second controllable switch is used to conduct when receiving a first control signal indicating the start of power supply, so that the buck control chip reduces the input voltage and supplies power to the load on the target satellite; it turns off when receiving a second control signal indicating the stop of power supply.

[0028] Further, it further includes a charging regulation module;

[0029] The first end of the charging regulation module is connected to the output end of the primary bus boost circuit, the second end is connected to the input end of the power storage module, and the control end is connected to the power supply control device, and is used to conduct when receiving a third control signal indicating that the power storage module needs to be charged, and turn off when receiving a fourth control signal indicating that the power storage module is fully charged.

[0030] Further, it further includes a voltage acquisition module, a current acquisition module and a voltage follower;

[0031] The voltage acquisition module is used to acquire the voltage signal at the target detection point and feedback the voltage signal to the power supply control device through the voltage follower; the target detection point includes at least one position point among the output end of the electric energy initial output module, the input end of the voltage conversion module, the output end of the voltage conversion module, and the input end of the electric energy storage module;

[0032] The current acquisition module is used to acquire the current signal at the target detection point and feedback the current signal to the power supply control device through the voltage follower.

[0033] Furthermore, a communication module is further included;

[0034] The input end of the communication module is connected to the power supply control device, and the output end is connected to the upper control module, and is used to receive the target information to be sent by the power supply control device and send the target information to the upper control module.

[0035] The present application provides a power supply control method, device and power supply system for a nanosatellite. The power supply system includes an electric energy initial module and an electric energy storage module as a reserve power supply to ensure reliable power supply to the on-board load under various conditions; and in this solution, the output voltage and output current of the electric energy initial output module are obtained to timely master the energy input situation of the entire power supply system; based on the output voltage, output current and the conductance calculated in the previous control period, the conductance increment is determined; and then according to the conductance increment and the preset control strategy, the target duty ratio for controlling the on and off of the controllable switch in the voltage conversion module in the next control period is determined, so as to drive the controllable switch according to the target duty ratio, and further make the output power of the electric energy initial output module reach the preset maximum output power point, which is beneficial to ensuring that the electric energy initial output module always operates near the maximum power point, beneficial to maximizing the use of electric energy resources on the basis of adapting to the space environment to ensure reliable power supply to the on-board load, and beneficial to practical applications.

[0036] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the specific embodiments of the present application are specifically given below. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation of the present application. In the drawings:

[0038] Figure 1 is a flowchart of a power supply control method for a nanosatellite provided by the present invention;

[0039] Figure 2 Schematic diagram of the power supply system of a picosatellite provided by the present invention;

[0040] Figure 3 Schematic diagram of the power supply control device of a picosatellite provided by the present invention. Detailed implementation manners

[0041] The core of the present invention is to provide a power supply control method, device and power supply system for a picosatellite, which is conducive to maximizing the use of electric energy resources on the basis of adapting to the space environment to ensure reliable power supply for on-board loads.

[0042] Next, the technical solutions in the embodiments of the present application will be clearly described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present application.

[0043] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. generally belong to the same category, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally represents an "or" relationship between the associated objects before and after.

[0044] Please refer to Figure 1 and Figure 2 , Figure 1 Flowchart of a power supply control method for a picosatellite provided by the present invention, Figure 2 Schematic diagram of the power supply system of a picosatellite provided by the present invention.

[0045] The power supply control method for the picosatellite is applied to a control module in the power supply system of the picosatellite. The power supply system further includes an initial power output module 1, a voltage conversion module 2, and a power storage module 3 connected in sequence. The voltage conversion module 2 is used to perform voltage conversion to charge the power storage module 3 as a reserve power source and / or supply power to each on-board load in the picosatellite. The voltage conversion module 2 includes a controllable switch connected to the control module. The power supply control method for the picosatellite includes:

[0046] S11: Obtain the output voltage and output current of the initial power output module 1 in the current control cycle;

[0047] S12: Determine the conductance increment based on the output voltage, output current, and the conductance calculated in the previous control period.

[0048] S13: According to the conductance increment and the preset control strategy, determine the target duty cycle for controlling the conduction and cutoff of the controllable switch in the next control period, so as to drive the controllable switch according to the target duty cycle, thereby enabling the output power of the initial power output module 1 to reach the preset maximum output power point.

[0049] In this embodiment, a technical solution for realizing efficient and reliable power supply to each on-board load on the nanosatellite is provided. Specifically, the control module here may include a single-chip microcomputer and the peripheral circuits arranged around the single-chip microcomputer. The peripheral circuits here may include a dual 8-channel analog multiplexer such as MAX397 and a reference voltage source such as MAX6129, etc.; more specifically, the single-chip microcomputer here may be an ATmega8L single-chip microcomputer, which has 23 programmable multifunctional I / O ports (Input / Output), eight-channel 10-bit A / D conversion (Analog / Digital), and three-channel PWM (Pulse Width Modulation) output functions within 16 bits, and can well realize the control function of the control module in this application.

[0050] The initial power output module 1 may be a solar array to realize the conversion of solar energy to electrical energy based on the space environment parameters to achieve the initial electrical energy supply of the nanosatellite; the power storage module 3 may be a battery pack, more specifically, a lithium-ion battery pack, so as to realize the storage of electrical energy as a reserve power source to achieve emergency power supply. The voltage conversion module 2 here may include a primary bus boost circuit 21 and N secondary bus buck circuits. The controllable switch connected to the control module here refers to the controllable switch in the primary bus boost circuit 21. By controlling the duty cycle of the controllable switch, the output voltage of the solar array can be adjusted. For the solar array, when its output voltage reaches a specific value, the product of it and the corresponding current value will reach the maximum value, that is, reach the preset maximum output power point of the solar array, thereby realizing the peak power tracking of the initial power output module 1.

[0051] It should also be noted that the specific implementation steps of step S12 may be: divide the output current of the current control period by the output voltage to obtain the conductance of the current control period, and determine that the difference between the conductance of the current control period and the conductance calculated in the previous control period is the conductance increment.

[0052] In summary, the present application provides a power supply control method for a picosatellite, which is conducive to ensuring that the initial power output module 1 always operates near the maximum power point, is conducive to maximizing the utilization of electric energy resources on the basis of adapting to the space environment to ensure reliable power supply for on-board loads, has the characteristics of high efficiency, high energy density, and autonomous and intelligent control, and is conducive to practical applications.

[0053] Based on the above embodiments:

[0054] In some embodiments, according to the conductance increment and a preset control strategy, determining the target duty cycle for controlling the conduction and cutoff of the controllable switch in the next control cycle includes:

[0055] Respectively perform fuzzy processing on the conductance increment and the duty cycle adjustment step in the current control cycle to obtain the conductance increment fuzzy membership degree and the duty cycle adjustment step fuzzy membership degree;

[0056] Perform fuzzy inference according to the conductance increment fuzzy membership degree, the duty cycle adjustment step fuzzy membership degree, and a preset fuzzy rule to obtain the duty cycle adjustment step fuzzy membership degree corresponding to the next control cycle;

[0057] Perform defuzzification on the duty cycle adjustment step fuzzy membership degree corresponding to the next control cycle according to a preset duty cycle adjustment step membership function and a defuzzification algorithm to obtain the duty cycle adjustment step corresponding to the next control cycle;

[0058] Based on the duty cycle corresponding to the current control cycle and the duty cycle adjustment step corresponding to the next control cycle, determine the target duty cycle for controlling the conduction and cutoff of the controllable switch.

[0059] Specifically, the preset fuzzy rule here can be set by technicians according to experience or designed relying on a general expert fuzzy database, and no special limitation is made here; the preset duty cycle adjustment step membership function here can specifically be a linear membership function or a trigonometric function membership function, and no special limitation is made here, and it can be designed according to the actual needs of the project; finally, it is determined that the sum of the duty cycle corresponding to the current control cycle and the duty cycle adjustment step corresponding to the next control cycle is the target duty cycle.

[0060] It should also be noted that after introducing the above fuzzy control method, compared with the method of directly adjusting the target duty cycle according to the conductance increment, in the standard space environment, (AM0, 25°C), that is, the air mass is 0 and the operating temperature of the solar cell array is 25°C, the peak power tracking time is reduced by more than 60%, the maximum output power of the solar cell array can reach about 2.75W, and the overall power utilization efficiency remains above 82%.

[0061] In some embodiments, the conductance increment and the duty cycle adjustment step in the current control cycle are respectively fuzzified to obtain the fuzzy membership degree of the conductance increment and the fuzzy membership degree of the duty cycle adjustment step, including:

[0062] Fuzzify the conductance increment in the current control cycle based on a preset conductance increment membership function to obtain the fuzzy membership degree of the conductance increment;

[0063] Fuzzify the duty cycle adjustment step in the current control cycle based on a preset duty cycle adjustment step membership function to obtain the fuzzy membership degree of the duty cycle adjustment step.

[0064] Specifically, the preset conductance increment membership function here can be, specifically, a linear membership function or a trigonometric function membership function, and no special limitation is made here. It can be designed according to the actual engineering needs.

[0065] Please refer to Figure 3 , Figure 3 , which is a schematic structural diagram of a power supply control device for a picosatellite provided by the present invention.

[0066] The power supply control device for the picosatellite includes:

[0067] A memory 81 for storing a computer program;

[0068] A processor 82 for implementing the steps of the power supply control method for the picosatellite as described above when executing the computer program.

[0069] For the introduction of the power supply control device for the picosatellite provided in this application, please refer to the embodiments of the power supply control method for the picosatellite above, and details are not described here again.

[0070] Please refer to Figure 2 , Figure 2 , which is a schematic structural diagram of a power supply system for a picosatellite provided by the present invention.

[0071] The present invention also provides a power supply system for a picosatellite, including an initial power output module 1, a voltage conversion module 2, and an energy storage module 3 connected in sequence, and further including the power supply control device 4 for the picosatellite as described above;

[0072] The voltage conversion module 2 is used for voltage conversion to charge the energy storage module 3 as a reserve power source and / or supply power to each on-board load in the picosatellite. The voltage conversion module 2 includes a controllable switch connected to the power supply control device 4.

[0073] For the introduction of the power supply system for the picosatellite provided in this application, please refer to the embodiments of the power supply control method for the picosatellite above, and details are not described here again.

[0074] In some embodiments, the voltage conversion module 2 includes a primary bus boost circuit 21 and N secondary bus buck circuits, where N is an integer not less than 1;

[0075] The input end of the primary bus boost circuit 21 is connected to the output end of the initial power output module 1. The output end of the primary bus boost circuit 21 is respectively connected to the input end of the power storage module 3 and the input ends of the secondary bus buck circuits. The primary bus boost circuit 21 includes a first controllable switch connected to the power supply control device 4, so that the power supply control device 4 controls the conduction and cutoff of the first controllable switch according to the determined target duty cycle;

[0076] The output end of the secondary bus buck circuit is connected to the power supply end of the on-board load on the picosatellite, and the control end is connected to the power supply control device 4.

[0077] In this embodiment, N here corresponds to the types of supply voltages acceptable to the on-board loads on the picosatellite. For example, if there are two types of on-board loads that respectively require a supply voltage of 3.3V and 5V, then N = 2.

[0078] In addition, the primary bus boost circuit 21 here can adopt a Boost DC-DC (Direct Current-Direct Current) voltage conversion circuit, which specifically can include a first controllable switch, a first freewheeling diode, a second freewheeling diode, a storage inductor, and a filter capacitor. One end of the storage inductor serves as the positive input end of the primary bus boost circuit 21. The other end of the storage inductor is respectively connected to the first end of the first controllable switch and the anode of the first freewheeling diode. The cathode of the first freewheeling diode is connected to one end of the filter capacitor, and the common connection end is used as the positive output end of the primary bus boost circuit 21. The second end of the first controllable switch is connected to the negative input end of the primary bus boost circuit 21, and the common connection end is connected to the other end of the filter capacitor and serves as the negative output end of the primary bus boost circuit 21 after connection. The anode of the second freewheeling diode is connected to the second end of the first controllable switch, and the cathode of the second freewheeling diode is connected to the first end of the first controllable switch; the first controllable switch includes, but is not limited to, a MOSFET

[0079] (Metal-Oxide-Semiconductor Field-Effect Transistor).

[0080] It can be understood that the boost conversion ratio of the primary bus boost circuit 21 satisfies the following relational expression:

[0081] M = Vout / Vin = 1 / (1 - D)

[0082] Since the output voltage Vout of the primary bus boost circuit 21 is clamped at the operating voltage of the electrical energy storage module 3, that is, the operating voltage of the battery pack (i.e., a specific value in the range of 7.2V to 8.4V), therefore, the regulated target duty cycle D can regulate the input voltage Vin of the primary bus boost circuit 21 (i.e., the output voltage of the solar cell array) to maximize the output power of the solar cell array.

[0083] It should also be noted that between the electrical energy initial output module 1 and the primary bus boost circuit 21, a combination switch 6 can also be provided, as Figure 2 shown. The input end of the combination switch 6 is connected to the output end of the electrical energy initial output module 1, the output end of the combination switch 6 is connected to the input end of the primary bus boost circuit 21, and the control end of the combination switch 6 is connected to the power supply control device 4, and is used to conduct when the entire power supply system inputs electrical energy and turn off when the electrical energy input stops; and the combination switch 6 can adopt the form of two MOSFETs connected in combination, and no special limitation is made here.

[0084] In addition, Figure 2 Limited by the key points shown in the figure and to avoid confusion in the wiring, the power supply control device is schematically shown in the form of a circle plus an attached drawing mark; and Figure 2 in the figure, N = 2 is taken as an example for illustration. Correspondingly, the first secondary bus buck circuit 22 is used to supply power to the load 51 on the first target star, and the second secondary bus buck circuit 23 is used to supply power to the load 52 on the second target star.

[0085] In some embodiments, the secondary bus buck circuit includes a second controllable switch and a buck control chip;

[0086] The first end of the second controllable switch is connected to the output end of the primary bus boost circuit 21, the second end is connected to the input end of the buck control chip, and the control end is connected to the power supply control device 4;

[0087] The output end of the buck control chip is connected to the power supply end of the load on the target star;

[0088] The second controllable switch is used to conduct when receiving a first control signal indicating the start of power supply, so that the buck control chip can step down the input voltage and supply power to the load on the target star; and turn off when receiving a second control signal indicating the stop of power supply.

[0089] Specifically, the selection of the buck control chip in any secondary bus buck circuit is determined according to the supply voltage of the load on the target star it is responsible for supplying power to. For example, referring to Figure 2, if the power supply demand of the load 51 on the first target star is 3.3V, the buck control chip 222 in the first secondary bus buck circuit 22 will step down the input voltage when the second controllable switch 221 is turned on to output a 3.3V voltage to the load 51 on the first target star. Preferably, the buck control chip 222 in the first secondary bus buck circuit 22 can be a Buck-type DC-DC buck conversion control chip of MAX651; if the power supply demand of the load 52 on the second target star is 5V, the buck control chip 232 in the second secondary bus buck circuit 23 will step down the input voltage when the second controllable switch 231 is turned on to output a 5V voltage to the load 52 on the second target star. Preferably, the buck control chip 232 in the second secondary bus buck circuit 23 can be a Buck-type DC-DC buck conversion control chip of MAX649.

[0090] It should also be noted that the second controllable switch here can be a MOSFET or a combined switch composed of two or even more MOSFETs, and no special limitation is made here. It can be set according to actual requirements.

[0091] In some embodiments, a charging regulation module 7 is further included;

[0092] The first end of the charging regulation module 7 is connected to the output end of the primary bus boost circuit 21, the second end is connected to the input end of the electric energy storage module 3, and the control end is connected to the power supply control device 4. It is used to conduct when receiving a third control signal indicating that the electric energy storage module 3 needs to be charged and turn off when receiving a fourth control signal indicating that the electric energy storage module 3 is fully charged.

[0093] Specifically, the charging regulation module 7 conducts when the electric energy storage module 3 is not fully charged and needs to be charged, and turns off when the electric energy storage module 3 is fully charged to avoid overcharging; more specifically, the charging regulation module 7 here can be a MOSFET or a combined switch composed of two or even more MOSFETs, and no special limitation is made here. It can be set according to actual requirements.

[0094] In some embodiments, a voltage acquisition module, a current acquisition module and a voltage follower are further included;

[0095] The voltage acquisition module is used to acquire the voltage signal at the target detection point and feedback the voltage signal to the power supply control device 4 through the voltage follower; the target detection point includes at least one position point among the output end of the electric energy initial output module 1, the input end of the voltage conversion module 2, the output end of the voltage conversion module 2, and the input end of the electric energy storage module 3;

[0096] The current acquisition module is used to acquire the current signal at the target detection point and feedback the current signal to the power supply control device 4 through a voltage follower.

[0097] Specifically, through the above settings, reliable monitoring of the voltage and current at each target detection point in the power supply system can be ensured, which is conducive to timely detecting whether overvoltage and / or overcurrent occur at each target detection point and conducive to ensuring power supply safety; and the setting of the voltage follower is conducive to ensuring the integrity and stability of the electrical signal transmission.

[0098] It should also be noted that a first-order filter circuit, such as a first-order RC filter circuit, can also be included. The output of the voltage follower is filtered by the first-order filter circuit and then sent to the control module. Moreover, a multiplexing signal selection chip can be set between the first-order filter circuit and the power supply control device 4 to ensure efficient input of each signal without collision.

[0099] In some embodiments, a communication module is also included;

[0100] The input end of the communication module is connected to the power supply control device 4, and the output end is connected to the upper control module, and is used to receive the target information to be sent by the power supply control device 4 and send the target information to the upper control module.

[0101] In this embodiment, through the above settings, the target information to be sent can also be synchronized to the upper control module. Here, the content of the target information to be sent is not particularly limited, including but not limited to the voltage and / or current information at each target detection point collected, which can be set according to the actual communication requirements; specifically, the communication module here can be a MAX232 serial communication driver chip, using the serial communication standard EIA-RS-232C protocol. Taking the processor in the power supply control device 4 as a single-chip microcomputer as an example, the single-chip microcomputer outputs a TTL level signal, that is, following the logic 1 level is +5V and the logic 0 level is 0V; then through the communication module, the TTL level signal can be converted into an RS-232C signal acceptable to the upper control module, that is, following the logic 1 level is -5V to -15V and the logic 0 level is +5V to +15V, so as to ensure that the target information is accurately received by the upper control module.

[0102] In this specification, the various embodiments are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same or similar parts among the various embodiments, reference can be made to each other. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple. For the relevant parts, reference can be made to the description in the method section. Relative terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one" does not exclude the existence of another identical element in the process, method, article or device comprising the element.

[0103] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for controlling power supply of a pico-satellite, characterized in that: A control module applied to a power supply system of a pico-satellite, the power supply system further comprising an electric energy initial output module, a voltage conversion module and an electric energy storage module connected in sequence, the voltage conversion module being used to perform voltage conversion to charge the electric energy storage module as a reserve power source and / or to supply power to various onboard loads in the pico-satellite, the voltage conversion module comprising a controllable switch connected to the control module; The power supply control method of the pico-satellite comprises: Obtaining the output voltage and output current of the initial electric energy output module in the current control cycle; Determining a conductance increment based on the output voltage, the output current, and the conductance calculated in the previous control cycle; According to the conductance increment and the preset control strategy, the target duty cycle for controlling the on and off of the controllable switch in the next control cycle is determined, so as to drive the controllable switch according to the target duty cycle, thereby making the output power of the initial electric energy output module reach the preset maximum output power point.

2. The power supply control method for a pico-satellite according to claim 1, characterized in that: According to the conductance increment and the preset control strategy, determining a target duty cycle for controlling the on and off of the controllable switch in the next control cycle includes: The conductance increment and the duty cycle adjustment step length under the current control period are fuzzy processed to obtain the conductance increment fuzzy membership and the duty cycle adjustment step length fuzzy membership; Performing fuzzy reasoning according to the conductance increment fuzzy membership, the duty cycle adjustment step fuzzy membership and preset fuzzy rules to obtain the duty cycle adjustment step fuzzy membership corresponding to the next control period; Defuzzifying the duty cycle adjustment step fuzzy membership corresponding to the next control period according to a preset duty cycle adjustment step membership function and a defuzzification algorithm to obtain a duty cycle adjustment step corresponding to the next control period; Based on the duty cycle corresponding to the current control cycle and the duty cycle adjustment step corresponding to the next control cycle, a target duty cycle for controlling the on and off of the controllable switch is determined.

3. The power supply control method for a pico-satellite according to claim 2, characterized in that: The conductance increment and duty cycle adjustment step size under the current control cycle are fuzzy processed to obtain the conductance increment fuzzy membership and the duty cycle adjustment step size fuzzy membership, including: Based on the preset conductance increment membership function, the conductance increment in the current control period is fuzzy processed to obtain the conductance increment fuzzy membership degree; The duty cycle adjustment step length in the current control period is fuzzy processed based on the preset duty cycle adjustment step length membership function to obtain the duty cycle adjustment step length fuzzy membership degree.

4. A power supply control device for a pico-satellite, characterized in that: include: Memory for storing computer programs; A processor, configured to implement the steps of the method for controlling power supply of a pico satellite as claimed in any one of claims 1 to 3 when executing the computer program.

5. A power supply system for a pico-satellite, characterized in that: It includes an electric energy initial output module, a voltage conversion module and an electric energy storage module connected in sequence, and also includes the power supply control device of the pico satellite as claimed in claim 4; The voltage conversion module is used for performing voltage conversion to charge the power storage module as a reserve power source and / or to supply power to various onboard loads in the pico-satellite, and the voltage conversion module includes a controllable switch connected to the power supply control device.

6. The power supply system for the pico-satellite according to claim 5, characterized in that: The voltage conversion module includes a primary bus voltage boost circuit and N secondary bus voltage step-down circuits, where N is an integer not less than 1; The input end of the primary bus boost circuit is connected to the output end of the electric energy initial output module, and the output end of the primary bus boost circuit is respectively connected to the input end of the electric energy storage module and the input end of each of the secondary bus step-down circuits; the primary bus boost circuit includes a first controllable switch connected to the power supply control device, so that the power supply control device controls the conduction and shutoff of the first controllable switch according to the determined target duty cycle; The output end of the secondary busbar step-down circuit is connected to the power supply end of the target satellite load on the pico-satellite, and the control end is connected to the power supply control device.

7. The power supply system for the pico-satellite according to claim 6, characterized in that: The secondary bus voltage reduction circuit comprises a second controllable switch and a voltage reduction control chip; The first end of the second controllable switch is connected to the output end of the primary bus boost circuit, the second end is connected to the input end of the buck control chip, and the control end is connected to the power supply control device; The output end of the step-down control chip is connected to the power supply end of the load on the target satellite; The second controllable switch is used to be turned on when receiving a first control signal indicating starting power supply, so that the buck control chip can step down the input voltage to supply power to the load on the target satellite; and to be turned off when receiving a second control signal indicating stopping power supply.

8. The power supply system for the pico-satellite according to claim 5, characterized in that: Also included is a charge regulation module; The first end of the charging regulation module is connected to the output end of the primary bus boost circuit, the second end is connected to the input end of the electric energy storage module, and the control end is connected to the power supply control device, and is configured to be turned on when a third control signal indicating that the electric energy storage module is to be charged is received, and to be turned off when a fourth control signal indicating that the electric energy storage module is fully charged is received.

9. The power supply system for a pico-satellite according to claim 5, characterized in that: It also includes a voltage acquisition module, a current acquisition module and a voltage follower; The voltage acquisition module is used to collect the voltage signal at the target detection point, and feed the voltage signal back to the power supply control device through the voltage follower; the target detection point includes at least one position point among the output end of the electric energy initial output module, the input end of the voltage conversion module, the output end of the voltage conversion module, and the input end of the electric energy storage module; The current acquisition module is used to acquire the current signal at the target detection point, and feed back the current signal to the power supply control device through the voltage follower.

10. The power supply system for the pico-satellite according to claim 5, characterized in that: Also includes a communication module; The input end of the communication module is connected to the power supply control device, and the output end is connected to the upper control module, and is used to receive the target information to be sent by the power supply control device and send the target information to the upper control module.

Images