CN113949117A - Remote sensing satellite storage battery autonomous undervoltage protection method - Google Patents
Remote sensing satellite storage battery autonomous undervoltage protection method Download PDFInfo
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- 229910001416 lithium ion Inorganic materials 0.000 description 10
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 9
- 238000013461 design Methods 0.000 description 6
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- OJIJEKBXJYRIBZ-UHFFFAOYSA-N cadmium nickel Chemical compound [Ni].[Cd] OJIJEKBXJYRIBZ-UHFFFAOYSA-N 0.000 description 2
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00306—Overdischarge protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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Abstract
An autonomous undervoltage protection method for a remote sensing satellite storage battery comprises the following steps: step S1: acquiring voltage telemetering data of the storage battery and transmitting the voltage telemetering data to the satellite-borne computer; step S2: the satellite-borne computer judges whether the voltage telemetering data of the storage battery is credible or not; step S3: on-board computer can remotely measure the battery voltage and the undervoltage protection threshold value V in credible battery voltage telemetering datamComparing, if the voltage of the storage battery is lower than V within the preset abnormal durationmJudging that the storage battery is under-voltage; step S4: performing undervoltage protection of the battery, including one or more of: executing a load safety shutdown program control sequence, disconnecting a power distribution circuit of a satellite part, canceling a load task, adjusting a temperature control threshold value of a heating loop, and disconnecting the heating loop; step S5: the satellite-borne computer sends the storage battery under-voltage state to the control subsystem, and the control subsystem enables the solar cell array to complete sun-to-sun orientation, and charging of the storage battery is guaranteed.
Description
Technical Field
The invention relates to an autonomous undervoltage protection method for a remote sensing satellite storage battery, and relates to the technical field of on-orbit management of the remote sensing satellite storage battery.
Background
The remote sensing satellite power supply system generally adopts a solar cell array-storage battery system and an adjustable direct current bus system power supply scheme, and during the service life, the power supply system supplies power to the loads of all subsystems of the satellite uninterruptedly. The solar cell array source collection is completed in the illumination period, solar energy is converted into electric energy to supply power to a load and charge a storage battery, and the storage battery supplies power to a bus through a discharge regulator in the shadow period or the storage battery supplies power when the load power exceeds the power supply capacity of the solar cell array in the illumination period.
Therefore, the storage battery is an important component of a remote sensing satellite power supply system as a main energy storage device of the remote sensing satellite. In the design of early remote sensing satellites, cadmium-nickel batteries (Ni-Cd) are generally adopted, and along with the development of the remote sensing satellites, the cadmium-nickel batteries cannot meet the weight requirements under higher load ratio and higher power density. At present, more and more remote sensing satellites are provided with lithium ion storage batteries (Li-ion) with higher energy-to-weight ratio and energy-to-volume ratio as space energy storage components. The service life of the storage battery directly determines the working life of the power supply system, and further influences the on-orbit high reliability and long service life operation of the remote sensing satellite.
Although lithium ion batteries have the advantages of small size, light weight, and large capacity, they also suffer from the disadvantage of failing under certain conditions, including irreversible damage due to overcharge or overdischarge. Therefore, overcharge or overdischarge cannot occur when the lithium ion secondary battery is used under strict control. More and more remote sensing satellites have the capacity of on-orbit autonomous management of lithium ion storage batteries during design, including storage battery overcharge protection, storage battery overdischarge protection, storage battery charging curve switching, storage battery equalization management and the like.
The lithium ion storage battery autonomous undervoltage protection method adopted by the remote sensing satellite at present reduces the load of the satellite by setting the satellite to autonomously enter a minimum energy mode so as to reduce the energy consumption of the storage battery and prolong the working time of the storage battery. However, this method has the following disadvantages: other faults of the satellite, such as attitude abnormality, operation orbit error and the like, are not considered, so that the sun tracking of the solar cell array is abnormal, the storage battery is not charged in time, and the state of charge is continuously reduced to cause undervoltage. At present, an autonomous protection strategy is not adopted to protect the undervoltage of the storage battery aiming at the fault condition.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method overcomes the defects of the prior art, and provides an autonomous undervoltage protection method for a remote sensing satellite storage battery, which comprises the following steps: step S1: acquiring voltage telemetering data of the storage battery and transmitting the voltage telemetering data to the satellite-borne computer; step S2: the satellite-borne computer judges whether the voltage telemetering data of the storage battery is credible or not; step S3: on-board computer can remotely measure the battery voltage and the undervoltage protection threshold value V in credible battery voltage telemetering datamComparing, if the voltage of the storage battery is lower than V within the preset abnormal durationmJudging that the storage battery is under-voltage; step S4: performing undervoltage protection of the battery, including one or more of: executing a load safety shutdown program control sequence, disconnecting a power distribution circuit of a satellite part, canceling a load task, adjusting a temperature control threshold value of a heating loop, and disconnecting the heating loop; step S5: the satellite-borne computer sends the storage battery under-voltage state to the control subsystem, and the control subsystem enables the solar cell array to complete sun-to-sun orientation, and charging of the storage battery is guaranteed.
The purpose of the invention is realized by the following technical scheme:
an autonomous undervoltage protection method for a remote sensing satellite storage battery comprises the following steps:
step S1: acquiring voltage telemetering data of the storage battery through a sensor or a telemetering acquisition circuit, and transmitting the voltage telemetering data to the satellite-borne computer;
step S2: the satellite-borne computer judges whether the voltage telemetering data of the storage battery is credible or not according to one or more factors in the working state of the sensor, the state of the acquisition circuit and the communication state of the data interaction bus;
step S3: on-board computer can remotely measure the battery voltage and the undervoltage protection threshold value V in credible battery voltage telemetering datamComparing, if the voltage of the storage battery is lower than V within the preset abnormal durationmIf yes, judging that the storage battery is under-voltage, and turning to step S4;
step S4: performing undervoltage protection of the battery, including one or more of: executing a load safety shutdown program control sequence, disconnecting a power distribution circuit of a satellite part, canceling a load task, adjusting a temperature control threshold value of a heating loop, and disconnecting the heating loop;
step S5: the satellite-borne computer sends the storage battery under-voltage state to the control subsystem, and the control subsystem enables the solar cell array to complete sun-to-sun orientation, and charging of the storage battery is guaranteed.
In one embodiment of the invention, the on-board computer judges whether the voltage telemetering data of the storage battery is credible, so that the misjudgment of the voltage telemetering data of the storage battery caused by one or more factors of the influence of a satellite operating space environment, the reduction of circuit reliability, the decline of component performance, the abnormal operation of intelligent unit software and the error code of a data transmission link can be avoided.
In one embodiment of the invention, when the voltage telemetering data of the storage battery comprises a plurality of measuring results, a method of taking two out of three or giving a weighting coefficient is adopted to judge whether the battery is under-voltage or not.
In an embodiment of the present invention, in step S4, an enable control is provided for allowing or prohibiting execution of the under-voltage protection of the battery.
In one embodiment of the present invention, in step S5, the control subsystem is provided with an enable control for enabling or disabling the solar array to be oriented to the sun.
In an embodiment of the present invention, after step S5, the method further includes:
step S6: the on-board computer acquires the current orbit position of the satellite and judges whether the satellite is currently in the conversion from the illumination period to the ground shadow period;
step S7: if the satellite is currently in the conversion from the illumination period to the ground shadow period, the on-board computer acquires the credible storage battery voltage and the storage battery full charge voltage threshold value VcComparing, if the credible accumulator voltage is lower than V within the preset durationcAnd judging that the storage battery is not fully charged when the coil is charged.
An autonomous undervoltage protection method for a remote sensing satellite storage battery comprises the following steps:
step S10: acquiring voltage telemetering data of the storage battery through a sensor or a telemetering acquisition circuit, and transmitting the voltage telemetering data to the satellite-borne computer;
step S20: the satellite-borne computer judges whether the voltage telemetering data of the storage battery is credible or not according to one or more factors in the working state of the sensor, the state of the acquisition circuit and the communication state of the data interaction bus;
step S30: and (3) low-voltage early warning judgment of the storage battery: on-board computer will be credible battery voltage and warning threshold VwComparing, if the voltage of the storage battery is lower than the threshold value V within the preset abnormal durationwIf yes, judging that low-voltage early warning occurs, and turning to step S40 to execute low-voltage early warning protection of the storage battery;
judging the undervoltage of the storage battery: on-board computer can remotely measure the battery voltage and the undervoltage protection threshold value V in credible battery voltage telemetering datamComparing, if the voltage of the storage battery is lower than V within the preset abnormal durationmIf yes, judging that the storage battery is under-voltage, and turning to the step S40 to execute storage battery under-voltage protection;
step S40: and executing low-voltage early warning protection of the storage battery, wherein the low-voltage early warning protection comprises one or more of the following operations: switching a charging control curve, and setting low-voltage early warning treatment operation as forbidden;
performing undervoltage protection of the battery, including one or more of: executing a load safety shutdown program control sequence, disconnecting a power distribution circuit of a satellite part, canceling a load task, adjusting a temperature control threshold value of a heating loop, and disconnecting the heating loop;
step S50: the satellite-borne computer sends the storage battery under-voltage state to the control subsystem, and the control subsystem enables the solar cell array to complete sun-to-sun orientation, and charging of the storage battery is guaranteed.
In an embodiment of the present invention, in step S40, a storage battery under-voltage protection enabling control is provided for allowing or prohibiting execution of storage battery under-voltage protection; and the storage battery low-voltage early warning treatment enabling control is arranged and used for allowing or forbidding execution of the storage battery low-voltage early warning treatment.
In one embodiment of the invention, the on-board computer judges the low-voltage early warning of the storage battery, and can avoid the situation that the storage battery is abnormally charged and cannot be charged according to a designed control strategy.
In an embodiment of the present invention, after step S50, the method further includes:
step S60: the on-board computer acquires the current orbit position of the satellite and judges whether the satellite is currently in the conversion from the illumination period to the ground shadow period;
step S70: if the satellite is currently in the conversion from the illumination period to the ground shadow period, the on-board computer acquires the credible storage battery voltage and the storage battery full charge voltage threshold value VcComparing, if the credible accumulator voltage is lower than V within the preset durationcAnd judging that the storage battery is not fully charged when the coil is charged.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention ensures the credibility of the telemetering data and avoids the occurrence of unexpected protection actions caused by telemetering data errors by judging the acquired telemetering data of the storage battery voltage in various aspects including the fusion judgment of the state of the acquisition circuit, the data processing link and the data interaction state.
(2) The invention ensures the reliability of the judgment result of the undervoltage of the storage battery by the combined interpretation of the voltage judgment results of the plurality of storage batteries, and avoids the occurrence of unexpected protection actions caused by abnormal operation or logic errors of the satellite-borne computer.
(3) When the storage battery is over-discharged, the satellite attitude maneuver is carried out while the satellite safety protection is carried out, so that the solar cell array can complete the sun tracking in time, the charging of the storage battery and the power supply of the satellite can be ensured, the damage to the storage battery caused by further discharging is prevented, the reliability of the satellite is improved, and the service life of the storage battery is prolonged.
(4) According to the method, protection actions of different levels are executed according to low voltage conditions of different levels of the storage battery, hierarchical storage battery under-voltage protection is achieved, and the refinement degree of satellite autonomous management is improved.
(5) According to the method, the charging condition of the storage battery in the circle is judged through the judgment of the voltage of the storage battery when the ground shadow is changed by the illumination of each circle of the satellite, and an event report is generated to give an early warning to the ground when the storage battery is not fully charged, so that the ground can be ensured to recognize the non-full charge state of the storage battery in advance.
(6) The method is flexible to use, the voltage threshold, the disposal strategy and the disposal identification which are related to the method can be modified through upper notes, the method has universality and compatibility, and the method can meet the requirements of storage battery under-voltage protection of different types of spacecrafts.
Drawings
FIG. 1 is a block flow diagram of the method of the present invention.
FIG. 2 is a flow chart of an embodiment of the method of the present invention.
Fig. 3 is a diagram of telemetry source packet content and format in accordance with the present invention.
FIG. 4 is a flow chart of an embodiment of the method of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
A remote sensing satellite lithium ion storage battery autonomous undervoltage protection method, namely a remote sensing satellite storage battery autonomous undervoltage protection method, includes the following steps:
step S1: battery voltage telemetry information acquisition: one or more sensors or telemetering acquisition circuits are used for acquiring one or more storage battery voltage telemetering and processing the voltage telemetering and the processing, and the voltage telemetering and processing is transmitted to the satellite-borne computer through a data interaction bus;
step S2: and (3) judging the telemetering reliability of the voltage of the storage battery: judging whether the battery voltage obtained in the step S1 is credible or not by the effectiveness determination of the battery voltage telemetering, wherein the judging method comprises the analysis of the working state of the sensor, the state of the acquisition circuit and the communication state of the data interaction bus or the fusion analysis of the working state, the state of the acquisition circuit and the communication state of the data interaction bus;
step S3: judging the undervoltage of the storage battery: on-board computer will be credible battery voltage and undervoltage protection threshold VmComparing, if the voltage of the storage battery is lower than V within the preset abnormal durationmJudging that the storage battery is under-voltage;
step S4: and (3) under-voltage protection operation of the storage battery: if the battery is undervoltage as determined in step S3, when the disposal operation is "permitted", the battery is undervoltage-protected, and a predetermined protection operation sequence is executed. Generating an event report and broadcasting the event report to the ground through a downlink channel;
step S5: the satellite-borne computer sends the undervoltage state of the storage battery to the control subsystem through the data interaction bus, and the control subsystem finishes sun orientation and ensures the charging of the storage battery;
step S6: judging the position of the orbit of the satellite: the on-board computer acquires the current orbit position of the satellite and judges whether the satellite is currently in the conversion from the illumination period to the ground shadow period;
step S7: the storage battery is charged in a circle and is not fully charged: after the judgment in step S6, if the satellite is currently in the illumination period and is switched to the ground shadow period, when the charging underfill warning operation is "allowed", the on-board computer will use the trusted battery voltage and the battery full charge voltage threshold VcComparing, if the voltage of the storage battery is lower than V within the preset durationcIf the charging is not fully charged in the current circle, the current circle of the storage battery is judged, and an event report is generated to broadcast through a downlink channelSent to the ground.
Specifically, in step S1, the battery voltage acquisition circuit is generally a dual-terminal acquisition circuit commonly used in satellites, or the voltage information acquired by the intelligent unit through the sensor is processed by signal amplification, a/D conversion, and the like. The data interaction bus, the data communication bus between the telemetering acquisition equipment and the satellite-borne computer, including RS422 and 1553B, CAN buses and the like.
Specifically, in step S2, the necessity of performing the reliability judgment of the battery voltage telemetry is that the acquired voltage value cannot represent the true battery voltage due to the environmental impact of the satellite operating space, the reliability of the circuit is reduced, the performance of the device is degraded, the operation of the intelligent unit software is abnormal, and the error code of the data transmission link, and at this time, the battery voltage telemetry is used as the criterion, which may cause the erroneous judgment, and further, the subsequent protection operation is erroneously triggered, thereby causing the unnecessary interruption of the satellite function or service. The method for judging the telemetering reliability comprises the steps of judging whether the reference voltage of the acquisition circuit is normal, whether the bus communication of the intelligent unit is normal and whether the software of the intelligent unit runs normally. If a plurality of battery voltage telemeters are acquired in step S1, the reliability of each telemeter is determined.
In the step S3, if the battery voltage telemetries are obtained in the step S1, the telemetries are respectively connected to the undervoltage protection threshold VmAnd comparing to obtain a plurality of comparison results, and performing fusion judgment on the plurality of comparison results, wherein the fusion judgment comprises two out of three, weighting coefficients and the like. And determining whether the storage battery is under-voltage according to the fusion judgment result.
Specifically, in step S4, the operation of under-voltage protection of the storage battery is a command sequence pre-stored in the on-board computer, and the voltage of the storage battery continuously decreases, which may be caused by: the unreasonable arrangement of load tasks causes energy crisis of the satellite, the short circuit of the distribution terminal causes energy consumption abnormity, and the satellite attitude abnormity or the control subsystem uses orbit errors to cause abnormal charging of the storage battery. The storage battery under-voltage protection operation sequence is designed for the reasons, so that the energy consumption of the satellite is reduced, and the storage battery is charged to the maximum extent. The method comprises the following steps: and executing a load safety shutdown program control sequence, disconnecting a power distribution circuit of a satellite part, canceling a load task, adjusting a temperature control threshold value of a heating circuit of the part or disconnecting the heating circuit of the part, and further reducing the energy consumption of the satellite.
In step S4, the under-voltage battery protection operation support is set to "permitted" or "prohibited". The preset storage battery under-voltage protection operation instruction sequence supports modification.
In step S4, the event report records the event code reflecting the undervoltage of the storage battery, the occurrence time of the undervoltage event of the storage battery, and the detailed information of the undervoltage event of the storage battery, specifically including the measured voltage telemetering value of the storage battery in real time, and determines the undervoltage protection threshold of the storage battery.
Specifically, in step S5, the on-board computer sends the information of the under-voltage state of the storage battery to the satellite control subsystem through the data interaction bus. The control subsystem judges whether the received storage battery under-voltage state information is effective or not, and is designed with an 'allowable response' identifier, and when the identifier is 'allowable' and the storage battery under-voltage state information is effective, the control subsystem completes day-to-day directional operation to guarantee charging of the storage battery. Specifically, the operation of sun-facing orientation comprises the steps of returning to zero of the sailboard, driving the executing mechanism according to the output information of the sensor, and performing attitude maneuver to finish sun-facing orientation. Specifically, the sensors include a digital sun sensor and an analog sun sensor, and the executing mechanism includes a momentum wheel, a control moment gyro and a thruster.
Specifically, in step S7, the battery is set to "allowed" or "prohibited" when the coil charging underfill warning support is set. The early warning is prevented from being triggered by mistake when the star computer runs abnormally or has logic errors.
In the step S7, a plurality of credible telemetric data of the voltage of the storage battery are obtained by adopting the methods of the steps S1-S2, and each telemetric data is respectively matched with a threshold value V of the full charge voltage of the storage batterycAnd comparing to obtain a plurality of comparison results, and performing fusion judgment on the plurality of comparison results, wherein the fusion judgment comprises two out of three, weighting coefficients and the like. And determining whether the early warning of the charging and underfilling of the storage battery in the coil occurs or not according to the fusion judgment result.
The above-mentionedUndervoltage protection threshold V in step S3 and step S7mAnd a voltage threshold V of full charge of the batterycCan be selected according to the characteristics of the lithium ion storage battery and supports on-track modification.
The method of the invention can be further expanded to:
step S1: battery voltage telemetry information acquisition: one or more sensors or telemetering acquisition circuits are used for acquiring one or more storage battery voltage telemetering and processing the voltage telemetering and the processing, and the voltage telemetering and processing is transmitted to the satellite-borne computer through a data interaction bus;
step S2: and (3) judging the telemetering reliability of the voltage of the storage battery: judging whether the battery voltage obtained in the step S1 is credible or not by the effectiveness determination of the battery voltage telemetering, wherein the judging method comprises the analysis of the working state of the sensor, the state of the acquisition circuit and the communication state of the data interaction bus or the fusion analysis of the working state, the state of the acquisition circuit and the communication state of the data interaction bus;
step S3: and (3) low-voltage early warning judgment of the storage battery: on-board computer will be credible battery voltage and warning threshold VwComparing, if the voltage of the storage battery is lower than the threshold value V within the preset abnormal durationwIf yes, judging that low-voltage early warning occurs;
step S4: and (3) low-voltage early warning protection operation of the storage battery: through the judgment in the step S3, if the low voltage warning occurs in the storage battery, when the disposal operation is "permitted", the low voltage warning protection of the storage battery is performed, and a preset protection operation sequence is executed. Generating an event report and broadcasting the event report to the ground through a downlink channel;
step S5: judging the undervoltage of the storage battery: on-board computer will be credible battery voltage and undervoltage protection threshold VmComparing, if the voltage of the storage battery is lower than V within the preset abnormal durationmJudging that the storage battery is under-voltage;
step S6: and (3) under-voltage protection operation of the storage battery: if the battery is undervoltage as determined in step S5, when the disposal operation is "permitted", the battery is undervoltage-protected, and a predetermined protection operation sequence is executed. Generating an event report and broadcasting the event report to the ground through a downlink channel;
step S7: the satellite-borne computer sends the undervoltage state of the storage battery to the control subsystem through the data interaction bus, and the control subsystem finishes sun orientation and ensures the charging of the storage battery;
step S8: judging the position of the orbit of the satellite: the on-board computer acquires the current orbit position of the satellite and judges whether the satellite is currently in the conversion from the illumination period to the ground shadow period;
step S9: the storage battery is charged in a circle and is not fully charged: after the judgment in step S8, if the satellite is currently in the illumination period and is switched to the ground shadow period, when the charging underfill warning operation is "allowed", the on-board computer will use the trusted battery voltage and the battery full charge voltage threshold VcComparing, if the voltage of the storage battery is lower than V within the preset durationcAnd judging that the storage battery is not fully charged when the battery is charged, and generating an event report to be broadcast to the ground through a downlink channel.
Specifically, in step S3, if a plurality of battery voltage telemetries are obtained in step S1, each telemeter is respectively associated with a warning threshold VwAnd comparing to obtain a plurality of comparison results, and performing fusion judgment on the plurality of comparison results, wherein the fusion judgment comprises two out of three, weighting coefficients and the like. And determining whether the storage battery has low-voltage early warning according to the fusion judgment result.
Specifically, in step S4, the low voltage pre-warning protection operation is a command sequence pre-stored in the on-board computer. Causes of the battery voltage being too low include: the storage battery charging control is abnormal, the storage battery charging is not carried out according to a designed control strategy, and a protection operation sequence is designed for possible reasons, and comprises the following steps: the charging control curve is switched, and the low voltage warning handling operation is set to "forbidden". The preset low-voltage early warning protection operation instruction sequence supports modification. The battery low-voltage warning handling operation support is set to "permitted" or "prohibited". Specifically, in step S4, the event report record further reflects the event code of the warning, the time of occurrence of the low voltage warning, and the detailed information of the low voltage warning event, specifically includes the measured remote battery voltage value measured in real time, and the warning threshold used for the judgment.
In particular, the stepsIn S5, undervoltage protection threshold VmShould be less than the warning threshold V in the step S3w. The warning threshold V in the steps S3, S5 and S9wUndervoltage protection threshold VmAnd a voltage threshold V of full charge of the batterycCan be selected according to the characteristics of the lithium ion storage battery and supports on-track modification.
Specifically, in step S9, the event report records details of an event code reflecting the early warning of the current charging and non-full charging of the storage battery, the time of the satellite during the period of the satellite from illumination to earth shadow, the time of the occurrence of the early warning event, and the early warning event of the current charging and non-full charging of the storage battery, and specifically includes a real-time measured storage battery voltage remote measurement value, and a full charge voltage threshold of the storage battery used for the determination.
Hereinafter, the technical solution of the present invention will be described in further detail with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it is to be understood that these drawings depict only typical embodiments of the invention and are therefore not to be considered limiting of the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. It should be noted that, for those skilled in the art, the steps included in the present invention may be disassembled or recombined without departing from the concept of the present invention, and they are also included in the protection scope of the present invention. In different embodiments of the present invention, the steps S3 and S4 may be controlled not to be executed according to the design of the system, and the implementation effect of the present invention is not affected.
The invention provides an autonomous undervoltage protection method for a remote sensing satellite storage battery.
FIG. 1 shows a flow chart of the method of the present invention.
The first embodiment is as follows:
fig. 2 is a flow chart of a first embodiment of the method of the present invention.
S1 collecting battery voltage respectively through two telemetering collection channels and power controller of platform data interface unit to obtain three battery voltage telemetering measurements, and recording as VB1、VB2And VB3After A/D conversion, the data are organized into a telemetering source packet which is sent to a system management unit through a 1553B bus.
And S2, the system management unit judges the telemetering reliability of the voltage of the storage battery. As shown in fig. 3, in addition to battery voltage telemetry, the telemetry source packet simultaneously transmits acquisition circuit calibration voltage, packet sequence count information to the system management unit. The acquisition circuit calibration voltage reflects whether the working state of the telemetry acquisition channel is normal, and the packet sequence count is +1 in each telemetry source packet generation period in the design of the platform data interface unit and the power supply controller software, so that whether the packet sequence count continuously changes reflects whether the platform data interface unit software and the power supply controller software operate normally. The system management unit determines that the calibration voltage is normal and the packet sequence count is incremented corresponding to the V received from the 1553B busB1、VB2And VB3Is effective, effective VB1、VB2And VB3Will be trusted.
S3 System management Unit continuing to establish an authentic Battery Voltage VB1、VB2And VB3Respectively corresponding to the warning threshold value VwMaking a comparison if VBi(i ═ 1,2,3) less than V for 10 secondswIf so, the comparison result R of the local path is seti1(i ═ 1,2,3), otherwise Ri0(i is 1,2, 3). To Ri(i-1, 2,3) by repeating the process with a certain number of repeating units, if R is1、R2、R3And if any two values are equal to 1, judging that the storage battery has low-voltage early warning. Alarm threshold value VwCan be modified on track.
And S4, when the 'low-voltage early warning protection operation' of the storage battery is marked as 'allowed', the system management unit executes a low-voltage early warning protection operation sequence of the storage battery: and switching the charging control mode of the storage battery, and setting the identifier of the low-voltage early warning protection operation of the storage battery to be forbidden. And generating a low-voltage early warning event report of the storage battery. The battery low-voltage warning protection operation may be set to "enable" or "disable".
S5 System management Unit continuing to establish an authentic Battery Voltage VB1、VB2And VB3Respectively associated with the undervoltage protection threshold VmMaking a comparison if VBi(i ═ 1,2,3) less than V for 10 secondsmIf so, the local comparison result L is seti1(i ═ 1,2,3), otherwise Li0(i is 1,2, 3). To Li(i-1, 2,3) by repeating the process with two out of three, if L1、L2、L3If any two values are equal to 1, the storage battery is judged to be under-voltage. Undervoltage protection threshold VmCan be modified on track.
S6, when the "battery undervoltage protection operation" is marked as "allow", the system management unit executes a battery undervoltage protection operation sequence, sequentially executing: deleting all unexecuted tasks, executing a load shutdown program control sequence and executing a satellite minimum energy mode setting sequence, wherein the steps of closing a navigation receiver, disconnecting a data transmission and effective load power distribution circuit, disconnecting part of heater circuits, adjusting temperature control thresholds of part of heater circuits to reduce thermal control power consumption and setting a storage battery under-voltage protection operation identifier as 'forbidden'. And generating a low-voltage and undervoltage event report of the storage battery.
The battery low under voltage protection operation may be set to "enable" or "disable".
And the S7 system management unit sends the storage battery under-voltage state information to the control subsystem central control unit through a 1553B bus.
Specifically, the storage battery under-voltage state information is sent to the central control unit through a data packet which is designed according to a 1553B bus communication protocol and has a set format and data error control. After the central control unit judges that the data packet format is correct, conforms to protocol design convention, verifies and corrects, and under the condition that the control subsystem responds to the storage battery under-voltage protection notification and is allowed, the central control unit completes rate damping, sun searching and sun alignment in sequence, can be maintained in a sun alignment mode, ensures the storage battery to be charged, and further waits for ground processing. If the control subsystem 'responds to the storage battery under-voltage protection notification' is forbidden, the central control unit ignores the received storage battery under-voltage state information and does not operate.
The S8 system management unit acquires the parameter sun vector Soz of the control subsystem, and judges: if Soz reaches 0.373 during the increase, the satellite is determined to be in a transition from the illumination period to the terrestrial shadow period.
S9 when the battery when coil charging is not full warning is marked as 'permission', the system management unit continuously obtains the credible battery voltage (i.e. reacquired by the method of S1-S2)B1、VB2And VB3Respectively corresponding to the voltage threshold V of the full charge of the storage batterycMaking a comparison if VBi(i ═ 1,2,3) less than V for 5 secondscIf so, the comparison result C of the local path is seti1(i ═ 1,2,3), otherwise Ci0(i is 1,2, 3). To Ci(i-1, 2,3) by repeating the process with a certain number of repeating units, if C1、C2、C3If any two values are equal to 1, the storage battery is judged to be not fully charged when the battery is charged. The system management unit generates a battery in-turn charge underfill event report. Voltage threshold V for full charge of accumulatorcCan be modified on track.
The battery can be set to be allowed or forbidden when the coil is charged with the early warning of the insufficient charge.
The format of the event report in steps S4, S6, and S9 is shown in table 1.
TABLE 1
Specifically, in step S4, the battery low-voltage warning protection operation sequence is a command sequence stored in the system management unit readable and writable memory, and the content and the timing sequence of the command sequence may be modified by a ground injection command. In step S6, the operation sequence of the under-voltage protection of the storage battery is a command sequence stored in the readable and writable memory of the system management unit, and the content and the timing sequence of the command sequence can be modified by the ground-based instruction.
Example two:
fig. 4 is a flow chart of a second embodiment of the method of the present invention.
S1 obtaining the accumulator voltage through a telemetering collection channel of the double remote units, and recording as VB1. The equalizer of the satellite configuration collects the voltage of the storage battery and records the voltage as V outside the function of completing the equalization control of the lithium ion storage batteryB2And V is connected via RS422 busB2And the equalizer reference voltage is sent to the power supply controller. The dual remote units and the power controller respectively organize telemetry source packets and send the telemetry source packets to the central processing unit through a 1553B bus.
And S2, the central processing unit judges the telemetering reliability of the voltage of the storage battery. The judgment criterion is as follows:
s2.1 double remote unit 1553B bus polling is normal
S2.2 Voltage of other remote units collected by the double remote units is in a normal range
When S2.1 and S2.2 are satisfied at the same time, the central processing unit judges VB1Is effective.
S2.3 Power controller 1553B bus polling is normal
S2.4 equalizer reference voltage is within normal range
When S2.3 and S2.4 are satisfied simultaneously, the central processing unit judges VB2Is effective.
Effective VB1And VB2Will be trusted.
S3 CPU keeps plausible accumulator voltage VB1And VB2Respectively associated with the undervoltage protection threshold VmMaking a comparison if VBi(i ═ 1,2) less than V for 60 secondsmIf so, the local comparison result L is seti1 (i-1, 2), otherwise Li0(i is 1, 2). If L is1、L2If any value is equal to 1, the storage battery is judged to be under-voltage. Undervoltage protection threshold VmCan be modified on track.
S4, when the "battery undervoltage protection operation" is marked as "allowed", the central processing unit executes a battery undervoltage protection operation sequence, sequentially executing: deleting all unexecuted instructions and tasks, executing a load shutdown program control sequence, and executing a satellite minimum energy mode setting sequence, wherein the steps comprise closing a navigation receiver, disconnecting a data transmission and effective load power distribution circuit, disconnecting part of heater loops, adjusting temperature control thresholds of part of heater loops to reduce thermal control power consumption, and closing a power amplifier. And generating a low-voltage and undervoltage event report of the storage battery.
The battery low under voltage protection operation may be set to "enable" or "disable".
And the S6 central processing unit sends a storage battery under-voltage state instruction to the control subsystem central control computer through a 1553B bus.
Specifically, the storage battery under-voltage state information is sent to the control computer through a remote control command which is designed according to a 1553B bus communication protocol and has a set format and codes. After the control computer judges that the format of the instruction is correct, the instruction code conforms to the pre-design and the checksum is correct, and under the condition that the control subsystem responds to the under-voltage protection notice of the storage battery and is allowed, the speed damping, the sun searching and the sun alignment are completed in sequence, and the control subsystem can be maintained in the sun alignment mode, ensures the storage battery to be charged and further waits for ground processing. If the control subsystem 'responds to the storage battery under-voltage protection notification' is forbidden, the central control unit ignores the received storage battery under-voltage state information and does not operate.
S6, the central processing unit acquires the parameter sun vector Soz of the control subsystem, and judges: if Soz reaches 0.373 during the increase, the satellite is determined to be in a transition from the illumination period to the terrestrial shadow period.
S7 when the battery when coil charging is not full warning is marked as 'permission', the central processing unit continuously obtains the credible battery voltage (i.e. reacquired by the method of S1-S2)B1And VB2Respectively corresponding to the voltage threshold V of the full charge of the storage batterycMaking a comparison if VBi(i ═ 1,2) less than V for 5 secondscIf so, the comparison result C of the local path is seti1(i ═ 1,2), otherwise Ci0(i is 1, 2). If C1、C2Any value in the above-mentioned two values is equal to 1, then it is judged thatThe storage battery is not fully charged when the battery is charged. The central processing unit generates a battery when the coil is charged and is not full of event report. Voltage threshold V for full charge of accumulatorcCan be modified on track.
The battery can be set to be allowed or forbidden when the coil is charged with the early warning of the insufficient charge.
Those skilled in the art will appreciate that those matters not described in detail in the present specification are well known in the art.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make variations and modifications of the present invention without departing from the spirit and scope of the present invention by using the methods and technical contents disclosed above.
Claims (10)
1. An autonomous undervoltage protection method for a remote sensing satellite storage battery is characterized by comprising the following steps:
step S1: acquiring voltage telemetering data of the storage battery through a sensor or a telemetering acquisition circuit, and transmitting the voltage telemetering data to the satellite-borne computer;
step S2: the satellite-borne computer judges whether the voltage telemetering data of the storage battery is credible or not according to one or more factors in the working state of the sensor, the state of the acquisition circuit and the communication state of the data interaction bus;
step S3: on-board computer can remotely measure the battery voltage and the undervoltage protection threshold value V in credible battery voltage telemetering datamComparing, if the voltage of the storage battery is lower than V within the preset abnormal durationmIf yes, judging that the storage battery is under-voltage, and turning to step S4;
step S4: performing undervoltage protection of the battery, including one or more of: executing a load safety shutdown program control sequence, disconnecting a power distribution circuit of a satellite part, canceling a load task, adjusting a temperature control threshold value of a heating loop, and disconnecting the heating loop;
step S5: the satellite-borne computer sends the storage battery under-voltage state to the control subsystem, and the control subsystem enables the solar cell array to complete sun-to-sun orientation, and charging of the storage battery is guaranteed.
2. The remote sensing satellite storage battery autonomous under-voltage protection method of claim 1, wherein the on-board computer determines whether the storage battery voltage telemetry data is credible, and can avoid misjudgment of the storage battery voltage telemetry data due to one or more factors of satellite operating space environment influence, circuit reliability reduction, component performance degradation, intelligent unit software operation abnormity and error codes of a data transmission link.
3. The remote sensing satellite storage battery autonomous undervoltage protection method of claim 1, wherein when the storage battery voltage telemetry data comprises a plurality of measurement results, a method of taking two out of three or giving a weighting coefficient is adopted to judge whether the battery is undervoltage.
4. The remote sensing satellite storage battery autonomous undervoltage protection method as claimed in claim 1, wherein in step S4, an enabling control is provided for allowing or prohibiting execution of the storage battery undervoltage protection.
5. The remote sensing satellite storage battery autonomous under-voltage protection method of claim 1, wherein in step S5, the control subsystem is provided with an enable control for enabling or disabling solar array sun-to-sun orientation.
6. The remote sensing satellite storage battery autonomous under-voltage protection method according to claim 1, wherein after step S5, the method further comprises:
step S6: the on-board computer acquires the current orbit position of the satellite and judges whether the satellite is currently in the conversion from the illumination period to the ground shadow period;
step S7: if the satellite is currently in the conversion from the illumination period to the ground shadow period, the satellite-borne computer acquires the credible storage battery powerVoltage and battery full charge voltage threshold VcComparing, if the credible accumulator voltage is lower than V within the preset durationcAnd judging that the storage battery is not fully charged when the coil is charged.
7. An autonomous undervoltage protection method for a remote sensing satellite storage battery is characterized by comprising the following steps:
step S10: acquiring voltage telemetering data of the storage battery through a sensor or a telemetering acquisition circuit, and transmitting the voltage telemetering data to the satellite-borne computer;
step S20: the satellite-borne computer judges whether the voltage telemetering data of the storage battery is credible or not according to one or more factors in the working state of the sensor, the state of the acquisition circuit and the communication state of the data interaction bus;
step S30: and (3) low-voltage early warning judgment of the storage battery: on-board computer will be credible battery voltage and warning threshold VwComparing, if the voltage of the storage battery is lower than the threshold value V within the preset abnormal durationwIf yes, judging that low-voltage early warning occurs, and turning to step S40 to execute low-voltage early warning protection of the storage battery;
judging the undervoltage of the storage battery: on-board computer can remotely measure the battery voltage and the undervoltage protection threshold value V in credible battery voltage telemetering datamComparing, if the voltage of the storage battery is lower than V within the preset abnormal durationmIf yes, judging that the storage battery is under-voltage, and turning to the step S40 to execute storage battery under-voltage protection;
step S40: and executing low-voltage early warning protection of the storage battery, wherein the low-voltage early warning protection comprises one or more of the following operations: switching a charging control curve, and setting low-voltage early warning treatment operation as forbidden;
performing undervoltage protection of the battery, including one or more of: executing a load safety shutdown program control sequence, disconnecting a power distribution circuit of a satellite part, canceling a load task, adjusting a temperature control threshold value of a heating loop, and disconnecting the heating loop;
step S50: the satellite-borne computer sends the storage battery under-voltage state to the control subsystem, and the control subsystem enables the solar cell array to complete sun-to-sun orientation, and charging of the storage battery is guaranteed.
8. The remote sensing satellite storage battery autonomous under-voltage protection method according to claim 7, wherein in step S40, a storage battery under-voltage protection enabling control is provided for allowing or prohibiting execution of storage battery under-voltage protection; and the storage battery low-voltage early warning treatment enabling control is arranged and used for allowing or forbidding execution of the storage battery low-voltage early warning treatment.
9. The remote sensing satellite storage battery autonomous undervoltage protection method of claim 7, wherein the on-board computer determines a low-voltage warning for the storage battery, and can avoid abnormal storage battery charging control and failure of storage battery charging according to a designed control strategy.
10. The remote sensing satellite battery autonomous under-voltage protection method according to claim 7, further comprising, after step S50:
step S60: the on-board computer acquires the current orbit position of the satellite and judges whether the satellite is currently in the conversion from the illumination period to the ground shadow period;
step S70: if the satellite is currently in the conversion from the illumination period to the ground shadow period, the on-board computer acquires the credible storage battery voltage and the storage battery full charge voltage threshold value VcComparing, if the credible accumulator voltage is lower than V within the preset durationcAnd judging that the storage battery is not fully charged when the coil is charged.
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