Satellite emergency power supply system and method

Abstract

The invention provides a satellite emergency power supply system and method. The system comprises a power generation unit, a power supply control unit, an energy storage unit, an emergency power supply unit, a comprehensive power control unit and a measurement and control unit. The power generation unit and the energy storage unit serve as power supplies in normal work and are connected with the power supply control unit. Wherein the energy storage unit also serves as a power supply under emergency work; the power supply control unit is used for controlling the power supply of the power generation unit or the energy storage unit in normal operation; the emergency power supply unit provides two paths of input, wherein one path receives normal power input from a power supply under normal work; one path receives emergency power supply input from the energy storage unit, and the two paths of power supply are output after being isolated and combined; the measurement and control unit is used for receiving a ground signal and sending the signal to the comprehensive power control unit, and the comprehensive power control unit processes the signal and then sends a switching instruction to the emergency power supply unit. The system can supply power to the satellite minimum system when the satellite has energy abnormity, guarantees the smoothness of a satellite telemetering and remote control path, and carries out the fault handling in time.

Description

Technical Field

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

[0002] The satellite's on-orbit energy supply is provided by different power sources depending on whether there is sunlight or not. When there is sunlight, it is provided by the power generation unit (solar array), and when there is no sunlight, it is provided by the energy storage unit. When the satellite is launched, the solar array is in a retracted state, and energy is provided by the energy storage unit. When an abnormality occurs in the energy supply path, the satellite will have power supply abnormality, resulting in the inability to transmit satellite telemetry signals and execute remote control commands, and enter an out-of-control state. At present, due to the large scale of the power supply system of satellites, configuring a complete backup power supply system will increase the weight of the satellite and increase the difficulty of satellite layout design. Through identification, the satellite comprehensive power supply, measurement and control, and attitude and orbit control can maintain the basic work of the satellite. In order to further ensure that the minimum system single machine can be powered on in an emergency even if an abnormality occurs, emergency power supply is added to the minimum system single machine in the power supply path to ensure that the telemetry and remote control path is unobstructed, and fault handling is carried out in a timely manner, so as to buy precious time for satellite emergency handling. Considering not increasing the burden on satellite design, the system needs to use the original energy storage unit to provide emergency power supply.

[0003] The patent document with publication number TWI399011B discloses an emergency power supply system, which has a fuel cell system and is connected to a system power supply. When the system power supply fails, the fuel cell system supplies power to the load instead, wherein a secondary battery is connected to the DC power path between the fuel cell and the power regulator in the fuel cell system. When the power regulator detects that the system power supply fails and the fuel cell stops, the DC power stored in the secondary battery can be used to restart the fuel cell. After restarting, the DC power supplied by the fuel cell is converted into AC power by the power regulator and supplied to the emergency load, etc. in a state disconnected from the system power supply. This patent cannot achieve autonomous switching of two inputs, and requires AC and DC conversion, which is complicated to operate.

[0004] Therefore, a system and method for satellite emergency power supply is needed. Summary of the invention

[0005] In view of the defects in the prior art, an object of the present invention is to provide a system and method for satellite emergency power supply.

[0006] A satellite emergency power supply system, comprising: a power generation unit, a power supply control unit, an energy storage unit, an emergency power supply unit, a comprehensive power control unit and a measurement and control unit;

[0007] The power generation unit and the energy storage unit are used as power supplies in normal operation and are respectively connected to the power supply control unit; wherein the energy storage unit is also used as a power supply in emergency operation;

[0008] The power supply control unit is used to control the power supply of the power generation unit or energy storage unit under normal operation;

[0009] The emergency power supply unit provides two inputs, one of which receives normal power from the power supply under normal working conditions, which is the normal power supply path; the other receives emergency power from the energy storage unit, which is the emergency power supply path; the two power supplies are isolated and combined before output;

[0010] The measurement and control unit is used to receive ground signals and send the signals to the integrated power control unit. After the integrated power control unit processes the signals, it issues a switch command to the emergency power supply unit.

[0011] Preferably, the emergency power supply unit comprises:

[0012] Switch module: including magnetic latching relay and telemetry circuit. The integrated power control unit controls the connection or disconnection of the emergency power supply path and detects the switch status through telemetry technology.

[0013] Protection module: includes two parallel fuses. When a short circuit occurs at the rear end of the protection module, the fuse cuts off the output of the circuit to protect the energy storage unit.

[0014] Isolation module: Implement power supply isolation and merging of normal power supply path or emergency power supply path input through diodes;

[0015] Among them, the normal power supply path uses two diodes in parallel to prevent the normal power supply path from being disconnected after the device is open-circuited; the emergency power supply path uses two groups of parallel diodes, each group consists of two diodes in parallel, and then the two groups of parallel diodes are connected in series to prevent the emergency power supply path from being disconnected due to the device being open-circuited, and to prevent the normal power supply path voltage from being connected in series to the energy storage unit due to a device short-circuit.

[0016] Preferably, the switch module comprises:

[0017] The emergency power supply path is equipped with a switch circuit, which cuts off the emergency power supply path as needed by receiving instructions from the integrated power control unit;

[0018] Specifically, the measurement and control unit receives the signal transmitted from the ground and forwards the signal to the integrated power control unit. The integrated power control unit converts the signal into executable instructions and sends them to the emergency power supply unit. The emergency power supply unit performs the switching action according to the instructions.

[0019] Preferably, the protection module includes:

[0020] The emergency power supply path is configured with a protection circuit, which includes parallel fuses; when the rear end of the protection circuit is short-circuited, the emergency power supply path is disconnected to protect the energy storage unit.

[0021] Preferably, the isolation module comprises:

[0022] An isolation circuit is configured to isolate the normal power supply input or the emergency power supply input; in normal operation, the input voltage of the normal power supply path is higher than the output voltage of the diode, so that the normal working path works; when the normal power supply path has no input voltage, the emergency power supply path works.

[0023] A method for applying the satellite emergency power supply system of claim 1, comprising:

[0024] Power supply steps: Under normal working conditions, the power supply control unit controls the power supply of the power generation unit or the energy storage unit; under abnormal working conditions, the energy storage unit is controlled to supply power alone; and the power supply under different working conditions is sent to the emergency power supply unit;

[0025] Emergency power supply steps: The emergency power supply unit sets up an internal circuit to isolate and combine the received power supply and then output the power supply;

[0026] Power supply output step: transmit the output power to the satellite minimum operating system.

[0027] Preferably, the emergency power supply steps include:

[0028] Switching steps: By receiving instructions from the integrated power control unit, cut off or connect the emergency power supply path as needed;

[0029] Protection steps: protect the energy storage unit by automatically disconnecting the circuit;

[0030] Isolation step: Isolate and merge the power supply input to the normal power supply path or the emergency power supply path through diodes, and output the power supply.

[0031] Preferably, the switching step comprises:

[0032] The measurement and control unit receives the signal transmitted from the ground and forwards it to the integrated power control unit. The integrated power control unit converts the signal into executable instructions and sends them to the emergency power supply unit. The emergency power supply unit performs the switching action according to the instructions.

[0033] Preferably, the protecting step comprises:

[0034] When the back end of the protection circuit is short-circuited, the emergency power supply path is disconnected to protect the energy storage unit.

[0035] Preferably, the isolation step comprises:

[0036] In the normal power supply path, two diodes are connected in parallel to prevent the normal power supply path from being disconnected due to the device opening; in the emergency power supply path, two groups of diodes are connected in parallel, each group consists of two diodes connected in parallel, and then the two groups of parallel diodes are connected in series to prevent the emergency power supply path from being disconnected due to the device opening, and to prevent the voltage of the normal power supply path from being connected to the energy storage unit due to the device short circuit;

[0037] When working normally, the input voltage of the normal power supply path is higher than the output voltage of the diode, so that the normal working path works; when the normal power supply path has no input voltage, the emergency power supply path works.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] 1. The present invention provides emergency power supply for the satellite's minimum system, buying precious time for satellite abnormality handling; at the same time, the present invention retains the original power supply platform, realizes emergency power supply through a smaller optimized design, and can adapt to satellite testing at all stages;

[0040] 2. The present invention can meet the requirement of supplying power to the satellite minimum system when the satellite has energy anomalies, ensuring smooth satellite telemetry and remote control channels, and timely handling of faults;

[0041] 3. The system of the present invention is equipped with an emergency power supply unit, which has two input functions. The two inputs switch automatically without interfering with each other, ensuring that the receiving unit works uninterruptedly;

[0042] 4. The emergency power supply path of the emergency power supply unit of the present invention directly draws power from the satellite energy storage unit, does not require additional energy storage modules, does not increase the weight of the satellite, has a simple design, and has the characteristics of high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0044] Figure 1 It is a schematic diagram of the principle of the satellite emergency power supply system of the present invention;

[0045] Figure 2 It is a schematic diagram of the principle of the emergency power supply unit of the present invention. DETAILED DESCRIPTION

[0046] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0047] like Figure 1 to Figure 2 As shown, the satellite emergency power supply system of the present invention includes a power generation unit, a power supply control unit, an energy storage unit, an emergency power supply unit, a comprehensive power control unit and a measurement and control unit.

[0048] The power generation unit and the energy storage unit are connected to the power supply control unit as the normal power supply; the energy storage unit also serves as the emergency power supply.

[0049] The emergency power supply unit provides two inputs, one for receiving normal power from the normal power supply, and one for receiving emergency power from the energy storage unit. The two power supplies are isolated and combined before output. The emergency power supply unit includes a switch module, a protection module, and an isolation module. The switch module consists of a magnetic latching relay and a telemetry circuit, which is controlled to be turned on or off by the measurement and control unit and the integrated power control unit, and the switch state is determined by telemetry technology. The protection module consists of two fuses in parallel to ensure that the output of the circuit is cut off when a short circuit occurs at the rear end of the protection module to protect the energy storage unit. The isolation module is implemented with diodes, in which the isolation diodes of the normal power supply path are connected in parallel to prevent the power supply path from being disconnected after the device is open; the isolation diodes of the emergency power supply path are connected in parallel first and then in series to prevent the emergency path from being disconnected due to the device being open, and to prevent the normal path voltage from being connected in series to the energy storage unit due to the device being short-circuited. Specifically, the normal power supply path passes through two parallel diodes and serves as the normal output; the emergency power supply path passes through two consecutive groups of parallel diodes (that is, there are two diodes connected in parallel in the front as the first group, and there are two diodes connected in parallel in the back as the second group, and the first group and the second group are connected in series) and serves as the emergency output; the normal output and the emergency output are combined in a single machine to power the subsequent minimum system single machine.

[0050] When the satellite is powered normally, the normal power supply path input voltage of the emergency power supply unit is 31V, and the output voltage after the diode is 30.3V; the emergency power supply path input voltage of the emergency power supply unit is 28.7V; due to the isolation of the diode in the emergency power supply path, the voltage at the output end of the diode is 30.3V, which is higher than the voltage at the input end of the diode 28.7V. At this time, the emergency power supply path does not supply power, and the normal power supply path supplies power. When the normal power supply path is abnormally powered off, the energy storage unit supplies power through the emergency power supply path. This power supply mode can ensure that the minimum system single machine is not powered off.

[0051] When the satellite is tested on the ground, the measurement and control unit receives the signal transmitted from the ground and forwards the signal to the integrated power control unit. The integrated power control unit converts the signal into an executable instruction and sends it to the emergency power supply unit. The emergency power supply unit performs the switch action according to the instruction. Specifically, the switch module is disconnected by sending an instruction through the measurement and control unit and the integrated power control unit to prevent the energy storage unit from still supplying power to the minimum system through the emergency power supply path after the satellite is powered off; before the satellite is launched, the measurement and control unit and the integrated power control unit send an instruction to connect the switch module of the emergency power supply unit to provide emergency power supply when necessary.

[0052] In summary, the present invention can provide emergency power supply for the satellite's minimum system at a critical moment, thereby buying precious time for handling satellite anomalies.

[0053] The present invention also provides a satellite emergency power supply method, which can be implemented by executing the satellite emergency power supply system, that is, those skilled in the art can understand the satellite emergency power supply method as a preferred implementation of the satellite emergency power supply system.

[0054] A method for applying the satellite emergency power supply system of claim 1, comprising: a power supply step: under normal operation, the power supply control unit controls the power supply of the power generation unit or the energy storage unit; during abnormal operation, the energy storage unit is made to supply power alone; and the power supply under different working conditions is sent to the emergency power supply unit; an emergency power supply step: the emergency power supply unit sets an internal circuit to isolate and combine the received power supply and then output the power supply; a power supply output step: the output power supply is transmitted to the satellite minimum operating system.

[0055] Specifically, the emergency power supply steps include: switching step: by receiving instructions from the comprehensive power control unit, cutting off or connecting the emergency power supply path as needed; protection step: protecting the energy storage unit by automatically disconnecting the circuit; isolation step: isolating and merging the power supply input to the normal power supply path or the emergency power supply path through a diode, and outputting the power supply.

[0056] Specifically, the switching steps include: the measurement and control unit receives the signal transmitted from the ground, and forwards the signal to the integrated power control unit, the integrated power control unit converts the signal into an executable instruction and sends it to the emergency power supply unit, and the emergency power supply unit performs the switching action according to the instruction.

[0057] Specifically, the protection step includes: when the rear end of the protection circuit is short-circuited, the emergency power supply path is disconnected to protect the energy storage unit.

[0058] Specifically, the isolation steps include: in a normal power supply path, connecting two diodes in parallel to prevent the normal power supply path from being disconnected due to an open circuit of the device; in an emergency power supply path, connecting two groups of diodes in parallel, each group consisting of two diodes in parallel, and then connecting the two groups of parallel diodes in series to prevent the emergency power supply path from being disconnected due to an open circuit of the device, and to prevent the normal power supply path voltage from being connected in series to the energy storage unit due to a short circuit of the device; when working normally, the input voltage of the normal power supply path is higher than the output voltage of the diode, so that the normal working path works; when there is no input voltage in the normal power supply path, the emergency power supply path works.

[0059] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A satellite emergency power supply system, characterized in that: include: Power generation unit, power supply control unit, energy storage unit, emergency power supply unit, comprehensive power control unit and measurement and control unit; The power generation unit and the energy storage unit are used as power supplies in normal operation and are respectively connected to the power supply control unit; wherein the energy storage unit is also used as a power supply in emergency operation; The power supply control unit is used to control the power supply of the power generation unit or energy storage unit under normal operation; The emergency power supply unit provides two inputs, one of which receives normal power from the power supply under normal working conditions, which is the normal power supply path; the other receives emergency power from the energy storage unit, which is the emergency power supply path; the two power supplies are isolated and combined before output; The measurement and control unit is used to receive ground signals and send the signals to the integrated power control unit. After processing the signals, the integrated power control unit issues a switch command to the emergency power supply unit.

2. The satellite emergency power supply system according to claim 1, characterized in that: The emergency power supply unit comprises: Switch module: including magnetic latching relay and telemetry circuit. The integrated power control unit controls the connection or disconnection of the emergency power supply path and detects the switch status through telemetry technology. Protection module: includes two parallel fuses. When a short circuit occurs at the rear end of the protection module, the fuse cuts off the output of the circuit to protect the energy storage unit. Isolation module: Implement power supply isolation and merging of normal power supply path or emergency power supply path input through diodes; Among them, the normal power supply path uses two diodes in parallel to prevent the normal power supply path from being disconnected after the device is open-circuited; the emergency power supply path uses two groups of parallel diodes, each group consists of two diodes in parallel, and then the two groups of parallel diodes are connected in series to prevent the emergency power supply path from being disconnected due to the device being open-circuited, and to prevent the normal power supply path voltage from being connected in series to the energy storage unit due to a device short-circuit.

3. The satellite emergency power supply system according to claim 2, characterized in that: The switch module comprises: The emergency power supply path is equipped with a switch circuit, which cuts off the emergency power supply path as needed by receiving instructions from the integrated power control unit; Specifically, the measurement and control unit receives the signal transmitted from the ground and forwards the signal to the integrated power control unit. The integrated power control unit converts the signal into executable instructions and sends them to the emergency power supply unit. The emergency power supply unit performs the switching action according to the instructions.

4. The satellite emergency power supply system according to claim 2, characterized in that: The protection module comprises: The emergency power supply path is configured with a protection circuit, which includes parallel fuses; when the rear end of the protection circuit is short-circuited, the emergency power supply path is disconnected to protect the energy storage unit.

5. The satellite emergency power supply system according to claim 2, characterized in that: The isolation module comprises: An isolation circuit is configured to isolate the normal power supply input or the emergency power supply input; in normal operation, the input voltage of the normal power supply path is higher than the output voltage of the diode, so that the normal working path works; when the normal power supply path has no input voltage, the emergency power supply path works.

6. A method for applying the satellite emergency power supply system according to claim 1, characterized in that: include: Power supply steps: Under normal working conditions, the power supply control unit controls the power generation unit or the energy storage unit to supply power; under abnormal working conditions, the energy storage unit is controlled to supply power alone; And the power supply under different working conditions is sent to the emergency power supply unit; Emergency power supply steps: The emergency power supply unit sets up an internal circuit to isolate and combine the received power supply and then output the power supply; Power supply output step: transmit the output power to the satellite minimum operating system.

7. The satellite emergency power supply method according to claim 6, characterized in that: The emergency power supply steps include: Switching steps: By receiving instructions from the integrated power control unit, cut off or connect the emergency power supply path as needed; Protection steps: protect the energy storage unit by automatically disconnecting the circuit; Isolation step: Isolate and merge the power supply input to the normal power supply path or the emergency power supply path through diodes, and output the power supply.

8. The satellite emergency power supply method according to claim 7, characterized in that: The switching step comprises: The measurement and control unit receives the signal transmitted from the ground and forwards it to the integrated power control unit. The integrated power control unit converts the signal into executable instructions and sends them to the emergency power supply unit. The emergency power supply unit performs the switching action according to the instructions.

9. The satellite emergency power supply method according to claim 7, characterized in that: The protection steps include: When the back end of the protection circuit is short-circuited, the emergency power supply path is disconnected to protect the energy storage unit.

10. The satellite emergency power supply method according to claim 7, characterized in that: The isolation step includes: In the normal power supply path, two diodes are connected in parallel to prevent the normal power supply path from being disconnected due to the device opening; in the emergency power supply path, two groups of diodes are connected in parallel, each group consists of two diodes connected in parallel, and then the two groups of parallel diodes are connected in series to prevent the emergency power supply path from being disconnected due to the device opening, and to prevent the voltage of the normal power supply path from being connected to the energy storage unit due to the device short circuit; When working normally, the input voltage of the normal power supply path is higher than the output voltage of the diode, so that the normal working path works; when the normal power supply path has no input voltage, the emergency power supply path works.

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