CN111007283B - Design method of umbilical cable for electrical measurement of small satellite - Google Patents
Design method of umbilical cable for electrical measurement of small satellite Download PDFInfo
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- CN111007283B CN111007283B CN201911195121.5A CN201911195121A CN111007283B CN 111007283 B CN111007283 B CN 111007283B CN 201911195121 A CN201911195121 A CN 201911195121A CN 111007283 B CN111007283 B CN 111007283B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
- G01R1/0408—Test fixtures or contact fields; Connectors or connecting adaptors; Test clips; Test sockets
- G01R1/0416—Connectors, terminals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/20—Modifications of basic electric elements for use in electric measuring instruments; Structural combinations of such elements with such instruments
- G01R1/24—Transmission-line, e.g. waveguide, measuring sections, e.g. slotted section
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
- H01R43/26—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for engaging or disengaging the two parts of a coupling device
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R2201/00—Connectors or connections adapted for particular applications
- H01R2201/20—Connectors or connections adapted for particular applications for testing or measuring purposes
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Abstract
一种小卫星电测用脐带电缆设计方法，综合考虑脐带电缆的可靠性和通用性，将电缆点的短接处理设计在脱落电连接器卫星端，并将分支端相同型号的电连接器中，相同电缆点号所对应的设备端设计为相同，大幅提高了脐带电缆的通用性和电缆芯线的利用率，同时又从根本上杜绝了电缆接线错误的可能性，进一步提高了小卫星电测的可靠性。
A method for designing an umbilical cable for electrical measurement of small satellites, considering the reliability and versatility of the umbilical cable, the short-circuit processing of the cable point is designed at the satellite end of the drop-off electrical connector, and the branch end is placed in the same type of electrical connector. , the equipment ends corresponding to the same cable point number are designed to be the same, which greatly improves the versatility of the umbilical cable and the utilization rate of the cable core wire, and at the same time fundamentally eliminates the possibility of cable wiring errors, and further improves the small satellite power. reliability of the test.
Description
Technical Field
The invention belongs to the technical field of instrument testing, and relates to a design method of an umbilical cable used in the electrical measurement of a small satellite.
Background
Satellite electrical measurement is an extremely important component in the satellite development and production stage, and is related to the success of satellite development to a certain extent. In the satellite electrical measurement stage, the umbilical cable is used as an energy supply channel and a backup transmission channel of key signals, and plays an important role.
An umbilical cable is a cable that connects satellites and electrical measurement equipment, with one end connected to the satellite using a drop-out electrical connector, commonly referred to as the drop-out electrical connector cable end. The other end is connected to electrical measurement equipment using electrical connectors, commonly referred to as the branch end.
Most of the existing umbilical cables use YF5-127T type drop-out electrical connectors and Y2-50 type electrical connectors. In use, there are two main problems:
(1) the balance between the universality and the specificity and the utilization rate of the cable core wires is difficult, and the utilization rate of the cable core wires is low. In current designs, shorting of cable points is typically done at both ends of the cable and emphasizes the versatility of the cable. Because power supply and signal parameters of different satellite electric measurements are different and meet the requirements of all satellites, when a certain satellite is electrified, a great number of cable cores meeting the requirements of other satellites in the umbilical cable are in an idle state;
(2) the reliability is not high, and certain potential safety hazard exists. The existing umbilical cord cable has the advantages that the power supply positive line and the power supply negative line are respectively located at different branch ends, and although the umbilical cord cable has a certain function of preventing wrong connection detection, serious safety accidents cannot be avoided when the cable is connected in a wrong way and forgets to detect the cable.
Disclosure of Invention
The technical problem solved by the invention is as follows: the method overcomes the defects of the prior art, comprehensively considers the reliability and the universality of the umbilical cable, and provides a novel design method of the umbilical cable.
The technical solution of the invention is as follows: a design method of an umbilical cable for small satellite electrical measurement comprises the following steps:
(1) determining electrical connectors used at two ends of the umbilical cable, wherein the electrical connectors comprise a shedding electrical connector connected with the satellite and an electrical connector at a branch end connected with electrical measurement equipment; the sum of the cable points of the branch-end electric connector is more than or equal to the cable points of the drop-out electric connector and less than twice of the cable points of the drop-out electric connector;
(2) according to the transmission function, the cable point of the umbilical cable is divided into a power cable point for transmitting energy and a signal cable point for transmitting signals, and the branch end of the umbilical cable is divided into a power end for transmitting energy and a signal end for transmitting signals;
(3) connecting power cable points in the power end with power cable points in the drop-off electric connector one by using cable core wires; in the electric connectors with the same model, the cables with the same point number are connected with the power supply ends of the same equipment;
(4) connecting signal cable points in the signal end with signal cable points in the drop-off electric connector one by using cable core wires, and if the signal end has redundant signal cable points, respectively connecting the signal cable points in the drop-off electric connector by using the cable core wires, so that a part of the signal cable points are arranged in the drop-off electric connector, and each point is connected with two signal cable points in the signal end;
(5) determining whether redundant signal cable points exist in the falling electric connector according to the number of signal points required by satellite electric measurement, and if the redundant signal cable points exist, carrying out short circuit processing on the signal cable points which are correspondingly connected with other umbilical cord cables one by one at the satellite end of the falling electric connector;
(6) ordering command signals and control signals required by satellite electrical measurement from high to low according to importance, allocating channels using two cable cores to signals with high importance, and allocating signals with low importance to channels of one cable core;
(7) the power cable points are divided into three parts, namely power supply positive points of the solar cell simulator, power supply positive points of the direct-current power supply and power supply negative points of all equipment, and the use of the power cable points is distributed according to the principle that the power supply positive points of different solar cell simulators are not connected, the power supply negative points of all the power supply equipment are in short circuit, and the direct-current power supply and the solar cell simulator share the power supply negative points.
The drop-out electric connector is a YF5-127T type drop-out electric connector. The branch end uses three electric connectors, 2 power ends use Y2-50 type electric connectors, and 1 signal end uses Y2-36 type electric connectors.
Preferably, in the step (7), the number of each positive power supply point of the solar cell simulator, the number of each positive power supply point of the direct-current power supply and the number of each negative power supply point of all the devices are even numbers.
Preferably, in the step (7), the specific allocation method of the power cable points includes:
(51) according to the use requirement of a satellite on a direct current power supply and the current carrying capacity of a cable core wire, the number wg of positive power supply points of the direct current power supply is determined, wherein wg is an even number, and the method specifically comprises the following steps:
setting the current-carrying capacity of a single cable core as IgThe power supply current required by the satellite is I, so that the number w of cable cores required by the power supply positive end is obtained
w＝I/Ig
wg is an even number equal to or greater than w;
(52) determining the number of power supply points of each solar cell simulator, specifically: if the number of the used solar cell simulators is ss, the positive power supply point number of each solar cell simulator is sa, and the negative power supply point number of each solar cell simulator is sb, in order to ensure that the same point number of the two power branch ends corresponds to the same equipment, sa and sb are both even numbers, and the order is that
(100-wg)/ss＝aa…………bb
In the formula, aa is a quotient and bb is a remainder;
setting cc as the maximum even number less than or equal to aa;
if cc/2 is even, then
sa＝sb＝cc/2
If cc/2 is odd, then
sa＝cc/2+1
sb＝cc/2-1；
(53) If unused power cable points still exist, sequentially adding 2 power cable points to the power supply positive end of each solar cell simulator according to the sequence of the solar cell simulator from the rear to the front in the shunting process.
Compared with the prior art, the invention has the advantages that:
(1) the invention greatly improves the universality of the umbilical cable. In the invention, because the short circuit processing of the cable point is mainly carried out at the satellite end of the falling electric connector, the short circuit processing of the cable point is not carried out at the two ends of the umbilical cable. Therefore, after different satellites are connected, different electrical measurement tasks can be completed, and the universality of the umbilical cable is greatly improved;
(2) the invention can greatly improve the utilization efficiency of the cable core wire while considering the universality. In the invention, because the special purpose is realized at the satellite end of the satellite shedding electric connector, and most of cable points at the two ends of the umbilical cable are connected one by one, the utilization rate of cable cores can be greatly improved by designing the satellite end of the shedding electric connector;
(3) the invention can improve the reliability of satellite electric measurement. In the invention, because the equipment ends corresponding to the same cable point number are designed to be the same in the umbilical cable branch end and the electric connectors with the same model, the possibility of umbilical cable wiring error is fundamentally eliminated, and the safety and the reliability of the small satellite electric measurement are greatly improved.
Drawings
FIG. 1 is a design flow diagram of the present invention;
FIG. 2 is a schematic diagram of the connection configuration of the electrical connectors at two ends of the umbilical cable according to the embodiment of the present invention.
Detailed Description
The design method of the invention divides the design of the umbilical cable into two parts in order to achieve the unification of the universality and the specificity of the cable: cable designs and drop electrical connector satellite side designs. The cable design considers the universality and the satellite end design considers the specificity of the drop electric connector. Therefore, when the same umbilical cable is connected with the falling-off electric connector satellite ends of different satellites, different electric measurement tasks can be completed. As shown in fig. 1, the method comprises the following steps:
1. cable point number design
In the satellite electrical measurement process, YF5-127T type drop-out electrical connectors (129 cable points in total, 127 number numbered points, and C, D two letter points) are generally selected, and are designed to be three branch ends for enveloping all the cable points, and 2Y 2-50 type (50 cable points per electrical connector) and 1Y 2-36 type (36 cable points) electrical connectors are used for 136 cable points, as shown in fig. 2.
The universality of the umbilical cable is considered, each cable point is fully utilized, and the short-circuit processing of the cable points is not carried out at the cable end.
1.1 Point number assignment scheme
The cable point is divided into two parts: a power cable point and a signal cable point.
Three Y2 electrical connectors were divided into two parts: 2Y 2-50 ends are power ends, and cable points in the electric connector are all power cable points and are used for transmitting energy; the 1Y 2-36 terminal is a signal terminal, and the cable points in the electric connector are all signal cable points used for transmitting signals.
1.2 Power endpoint number design
The power ends and the power cable points of the cable end of the drop electric connector are connected one by using cable cores. In order to prevent wiring errors, power cable points with the same point number in the 2 power ends are connected with power supply ends of the same equipment.
1.3 Signal endpoint number design
And connecting the 29 signal cable points of the cable end of the drop electric connector with the 29 signal cable points in the signal end one by one.
At this time, the signal branch end still has 7 signal cable points, and the 7 points are respectively connected with 7 signal cable points in the drop-off electric connector by using cable cores. Namely, 7 signal cable points are arranged in the cable end of the falling electric connector, and each point uses two cable core wires which are respectively connected with the two signal cable points in the signal end.
Therefore, in the umbilical cable, 136 cable cores are in total.
2. Design of satellite terminal number of drop-out electric connector
The method considers the specificity of different small satellites in electrical measurement and fully utilizes each cable point to carry out short circuit processing on the cable point at the satellite end of the drop electric connector.
The cable point is divided into a power cable point and a signal cable point at the satellite end of the shedding electric connector corresponding to the umbilical cable.
2.1 Point number distribution for Signal Cable
And determining whether redundant signal cable points exist in the falling electric connector according to the number of signal cable points required by satellite electric measurement. And if the redundant signal cable points exist, carrying out short-circuit processing on the satellite end of the falling electric connector. The method comprises the following specific steps:
the satellite electrical measurement requires a command signals and b measurement signals. Then there is
a+b≤29
Let p be 29- (a + b) be the remaining signal cable point (if a + b is 29, then p is 0, and the following assignment still applies).
And at the satellite end of the shedding electric connector, the rest p signal cable points are in short circuit with other signal cable points which correspond one to one. Because of the original 7 one-to-two signal cable points on the umbilical cable, it is possible to obtain that there are (7+ p) signal channels using two cable cores.
According to the electrical measurement requirement of the satellite, the command signal and the measurement signal of the satellite are respectively sequenced from high to low according to the importance.
2.1.1 Allocation of Command Signal points
In order to improve the reliability of the command transmission, the aforementioned (7+ p) channels using two cable cores are used as the command transmission channels. According to the importance sorting result, if the channels of the two redundant cable cores exist, the channels are distributed to important measurement signals; if not, the relative secondary instruction uses the transmission channel of a single cable core. The method comprises the following specific steps:
setting the number of command signals as d, according to the command signals and the result of ranking the importance of the measurement signals,
if (7+ p) > d, namely the number of channels using two cable cores is larger than the number of command signals, allocating ((7+ p) -d) transmission channels using two cable cores to important measurement signals;
if (7+ p) < d, i.e. the number of channels using two cable cores is smaller than the number of command signals, (d- (7+ p)) relatively secondary command signals are used for the transmission channel of a single cable core.
2.1.2 assigning measurement Signal points
And after the instruction signal is distributed, the rest signal channels are used as measuring signal channels. According to the importance ranking result, the relatively important measuring signals are transmitted by using two cable core transmission channels, and the other measuring signals are transmitted by using a single cable core transmission channel.
2.2 Power Point number assignment
The power transmission cable point is divided into three parts, namely a power supply positive point of the solar cell simulator, a power supply positive point of a direct current power supply and power supply negative points of all equipment, the three parts are not connected with each other, and the direct current power supply and the solar cell simulator share the power supply negative points. The power supply positive points of different solar cell simulators are not connected, and the power supply negative points of all power supply equipment are in short circuit.
In the electric connectors at the two power branch ends of the umbilical cable, the power supply equipment ends corresponding to the cable points with the same point number are the same, so that the number of the power supply positive points, the number of the power supply positive points of the direct-current power supply and the number of the power supply negative points of all the equipment of each solar cell simulator are even. The specific point number assignment scheme is as follows:
2.2.1 determining the number wg (wg is an even number) of positive points of power supply of the direct-current power supply according to factors such as the use requirement of the direct-current power supply during satellite electrical measurement, the current-carrying capacity of a cable and the like;
setting the current-carrying capacity of a single cable core as IgThe supply current required by the satellite is I, so that the number of cable cores (namely the number of positive supply points) required by the positive supply end is W
w＝I/Ig
By integrating factors such as redundancy design and wiring error prevention, wg is an even number which is more than or equal to w.
2.2.2 determine the number of power supply points per solar cell simulator.
If the number of the used solar cell simulators is ss, the positive power supply point number of each solar cell simulator is sa, and the negative power supply point number of each solar cell simulator is sb, in order to ensure that the equipment ends corresponding to the cable points with the same point number are the same in the two power branch ends, sa and sb are both even numbers, the order is made
(100-wg)/ss＝aa…………bb
In the formula, aa is a quotient and bb is a remainder.
Let cc be the largest even number equal to or less than aa.
If cc/2 is even, then
sa＝sb＝cc/2
If cc/2 is odd, considering that all the supply negatives are connected and sa and sb are even, it can be obtained
sa＝cc/2+1
sb＝cc/2-1
2.2.3 if there are unused power points, then the power supply positive points of some solar cell simulators can be increased.
And sequentially adding 2 power supply positive points to each solar cell simulator according to the sequence of the solar cell simulator from the rear to the front in the shunting process.
Example 1
Assuming a satellite, 4 solar array simulators are needed to supply power to the satellite during electrical measurement, and a direct current power supply (the supply current is less than 5A) is used only during power supply interface inspection (the use time is very short). The electrical measurement requires 6 command signals and 13 signal measurements. According to the method, the design scheme of the umbilical cable is as follows:
1.1 Cable Point number design
One end of the cable is an YF5-127T type electric connector, and 129 cable points are formed in total; the branch end is provided with three electric connectors, namely 2Y 2-50 type electric connectors and one Y2-36 type electric connector, and the number of the electric connectors is 136.
1.1.1 Point number assignment
The cable point is divided into two parts: the power cable point and the signal cable point are respectively the numbers of the cable end points of the falling electric connector: the power cable points are 1-100 points, the signal cable points are 101-127 points and the letters C, D points.
Three Y2 electrical connectors were divided into two parts: 2Y 2-50 ends are power ends, and cable points in the electric connector are all power cable points and are used for transmitting energy; the 1Y 2-36 terminal is a signal terminal, and the cable points in the electric connector are all signal cable points used for transmitting signals.
1.1.2 Power endpoint number design
In this embodiment, the power end Y2-50 electrical connector 1-50 points are correspondingly connected with the cable end 1-50 points of the drop electrical connector, and the power end Y2-50 electrical connector 1-50 points are correspondingly connected with the cable end 51-100 points of the drop electrical connector.
1.1.3 Signal endpoint number design
1.1.3.1 the 29 signal cable points of the cable end of the drop electrical connector are connected with the 29 signal cable points in the signal end in a one-to-one correspondence.
In the embodiment, 1 to 27 points of the Y2-36 type electric connector are respectively connected with 101 to 127 points of the cable end of the drop-out electric connector in a one-to-one correspondence manner, and 28 and 29 points are respectively connected with C, D points of the cable end of the drop-out electric connector in a one-to-one correspondence manner;
1.1.3.2 connect the remaining 7 signal cable points of the signal end with the 7 signal cable points in the drop electrical connector cable end.
In this example, the Y2-36 electrical connector is designed to have 30-36 points connected to 101-107 points of the cable end of the drop electrical connector. Namely, each point 101-107 of the cable end of the drop-out electrical connector corresponds to two cable points of the Y2-36 end.
Therefore, in the umbilical cable, 136 cable cores are in total.
1.2 drop-off connector satellite terminal number design
The cable point is divided into a power cable point and a signal cable point at the satellite end of the shedding electric connector corresponding to the umbilical cable.
1.2.1. Signal cable point number distribution
In the satellite electrical measurement, a is 6 command signals, and b is 13 measurement signals. Is provided with
6+13＝19<29
The number of signal cable points provided by the drop electric connector end is larger than the number required by electric measurement.
The number of the remaining signal cables is p-29- (a + b) -10.
And at the satellite end of the shedding electric connector, the rest 10 signal cable points are in short circuit with other signal cable points which correspond one to one. The method specifically comprises the following steps:
the point 108 is short-circuited with the point 120, the point 109 is short-circuited with the point 121, the point 110 is short-circuited with the point 122, the point 111 is short-circuited with the point 123, the point 112 is short-circuited with the point 124, the point 113 is short-circuited with the point 125, the point 114 is short-circuited with the point 126, the point 115 is short-circuited with the point 127, the point 116 is short-circuited with the point C of the letter, and the point 117 is short-circuited with the point D of the letter.
Because of the original 7 one-to-two signal cable points on the umbilical cable, it is possible to obtain that two cable cores are used for a total of (7+ p) ═ 17 signal channels.
According to the electrical measurement requirements of the satellite, the command signals of the satellite are ranked from high to low in importance as follows: instruction A, instruction B, instruction C, instruction D, instruction E and instruction F;
the measurement signals are ranked by importance from high to low as follows: measurement A, measurement B, measurement C, measurement D, measurement E, measurement F, measurement G, measurement H, measurement I, measurement J, measurement K, measurement L, measurement M.
1.2.1.1 Allocation of Command Signal points
Taking 6 channels using two cable cores as instruction signal transmission channels, specifically 101-106 points;
1.2.1.2 assigning measurement signal points
And after the instruction signal is distributed, the other points are measurement signal channels. Since 6< (7+10) > 17, there remain 17-6-11 channels using two cable cores. According to the sequencing result, the important measuring signals are distributed, and the channels of the single cable core are used for the relatively minor measuring signals.
In this example, the measurement signals using two cable cores are measurement a, measurement B, measurement C, measurement D, measurement E, measurement F, measurement G, measurement H, measurement I, measurement J, and measurement K, and the measurement signals using one cable core are measurement L and measurement M.
The specific design results are shown in table 1.
TABLE 1 design scheme of signal transmission point number of satellite terminal of drop electric connector
1.2.2 Power Cable Point number assignment
1.2.2.1 because the satellite uses DC power supply power very rarely, and when using DC power supply, supply current is less than 5A, and single cable conductor current-carrying capacity is 2.5A.
The number of cable cores (i.e. the number of positive power supply points) required by the positive power supply end is w-5/2.5-2
The number wg of the positive power supply points of the direct-current power supply is determined to be 4 by integrating factors such as redundancy design and wiring error prevention;
1.2.2.2 determining the number of power supply points per solar cell simulator
The number of the solar cell simulators is ss-4, the positive power supply point number of each solar cell simulator is sa, the negative power supply point number of each solar cell simulator is sb, and sa and sb are both even numbers to ensure that the same point numbers of the two power branch ends correspond to the same equipment, so that the solar cell simulators are enabled to be in parallel with each other
(100-wg)/ss＝aa…………bb
Namely, it is
(100-4)/4＝24
aa is 24, bb is 0, and the maximum even number cc of aa or less is 24.
cc/2 is an even number of 12, having
sa＝sb＝cc/2＝12
According to each power end, the power supply equipment ends corresponding to the same cable point number are the same, and a final power cable point number distribution scheme can be obtained, as shown in table 2.
TABLE 2 design scheme of power transmission point number of satellite terminal of drop electric connector
Example 2
Assuming a satellite, 10 solar array simulators are needed to supply power to the satellite during electrical measurement, and a direct current power supply (the supply current is less than 5A) is used only during inspection (the use time is very short) of a power supply interface. For the electrical measurement, 11 command signals and 15 signal measurements are required. According to the method, the design scheme of the umbilical cable is as follows:
2.1 Cable Point number design
One end of the cable is an YF5-127T type electric connector, and 129 cable points are formed in total; the branch end is provided with three electric connectors, namely two Y2-50 type electric connectors and one Y2-36 type electric connector, and the number of the electric connectors is 136.
2.1.1 Point number assignment
The cable point is divided into two parts: the power cable point and the signal cable point are respectively the numbers of the cable end points of the falling electric connector: the power cable points are 1-100 points, the signal cable points are 101-127 points and the letters C, D points.
Three Y2 electrical connectors were divided into two parts: 2Y 2-50 ends are power ends, and cable points in the electric connector are all power cable points and are used for transmitting energy; the 1Y 2-36 terminal is a signal terminal, and the cable points in the electric connector are all signal cable points used for transmitting signals.
2.1.2 Power endpoint number design
In this embodiment, the power end Y2-50 electrical connector 1-50 points are correspondingly connected with the cable end 1-50 points of the drop electrical connector, and the power end Y2-50 electrical connector 1-50 points are correspondingly connected with the cable end 51-100 points of the drop electrical connector.
2.1.3 Signal endpoint number design
2.1.3.1, connecting the 29 signal cable points at the cable end of the drop electric connector with the 29 signal cable points in the signal end in a one-to-one correspondence manner.
In the embodiment, 1 to 27 points of the Y2-36 type electric connector are correspondingly connected with 101 to 127 points of the cable end of the drop-out electric connector, and 28 and 29 points are correspondingly connected with C, D points of the cable end of the drop-out electric connector;
2.1.3.2 connect the remaining 7 signal cable points of the signal side to the 7 signal cable points in the drop electrical connector.
In this example, the Y2-36 electrical connector is designed to have 30-36 points connected to 101-107 points of the cable end of the drop electrical connector. Namely, each point 101-107 of the cable end of the drop electrical connector corresponds to two signal points of the Y2-36 end.
2.2 drop-off connector satellite terminal number design
The cable point is divided into a power cable point and a signal cable point at the satellite end of the shedding electric connector corresponding to the umbilical cable.
2.2.1. Signal point number distribution
In the satellite electrical measurement, a is 11 command signals, and b is 15 measurement signals. Is provided with
11+15＝26<29
The number of signal cable points provided by the drop electric connector end is larger than the number required by electric measurement.
The number of the remaining signal cables is p-29- (a + b) -3.
And at the satellite end of the drop electric connector, the rest 3 signal cable points are in short circuit with other signal cable points which are in one-to-one correspondence. The method specifically comprises the following steps:
the point 108 is short circuited with the point 127, the point 109 is short circuited with the point C, and the point 110 is short circuited with the point D.
Because of the original 7 one-to-two signal cable points on the umbilical cable, it is possible to obtain that two cable cores are used for (7+ p) ═ 10 signal channels.
According to the electrical measurement requirements of the satellite, the command signals of the satellite are ranked from high to low in importance as follows: instruction A, instruction B, instruction C, instruction D, instruction E, instruction F, instruction G, instruction H, instruction I, instruction J and instruction K;
the measurement signals are ranked by importance from high to low as follows: measurement A, measurement B, measurement C, measurement D, measurement E, measurement F, measurement G, measurement H, measurement I, measurement J, measurement K, measurement L, measurement M, measurement N, measurement O.
2.2.1.1 Allocation of Command Signal points
Because 11 instruction signals are provided, and the number of the channels using two cable cores is greater than 10, according to the importance sorting result, the instruction A to the instruction J use the transmission channels of two cable cores, specifically 101 to 110 points, and the instruction K uses the transmission channel of a single cable core, specifically 111 points;
2.2.1.2 assigning measurement signal points
And after the instruction signal is distributed, the rest are measurement signal channels. In this case, after the command signal is distributed, there are no transmission channels for two cable cores, so that all measurement signals use the transmission channel for a single cable core.
The specific design results are shown in table 3.
TABLE 3 design scheme of signal transmission point number of satellite terminal of drop electric connector
2.2.2 Power Point number assignment
2.2.2.1 because the satellite uses DC power supply power very rarely, and when using DC power supply, supply current is less than 5A, and single cable core current-carrying capacity is 2.5A.
The number of cable cores (namely the number of positive power supply points) required by the positive power supply end is
w＝5/2.5＝2
The number wg of the positive power supply points of the direct-current power supply is determined to be 4 by integrating factors such as redundancy design and wiring error prevention;
4.2.2.2 determining the number of power supply points per solar cell simulator
The number of the solar cell simulators is ss-10, the positive power supply point number of each solar cell simulator is sa, the negative power supply point number of each solar cell simulator is sb, and sa and sb are both even numbers to ensure that the same point numbers of the two power branch ends correspond to the same equipment, so that the solar cell simulators are enabled to be more stable and more reliable in operation
(100-wg)/ss＝aa…………bb
Namely, it is
(100-4)/10＝9………6
aa is 9, bb is 6, and the maximum even number cc of aa is 8.
cc/2 is an even number, having
sa＝sb＝cc/2＝4
In this case, a total of 10 × 4 × 2+ 4-84 power cable points are used, and 100-84-16 power cable points remain.
The sequence of the solar cell simulator from the rear to the first is as follows: the solar cell simulator comprises a solar cell simulator 1, a solar cell simulator 2, a solar cell simulator 3, a solar cell simulator 4, a solar cell simulator 5, a solar cell simulator 6, a solar cell simulator 7, a solar cell simulator 8, a solar cell simulator 9 and a solar cell simulator 10.
According to the sequence of the solar cell simulator from the current distribution back to the current distribution front, 2 power supply positive points are added to the solar cell simulator 1, the solar cell simulator 2, the solar cell simulator 3, the solar cell simulator 4, the solar cell simulator 5, the solar cell simulator 6, the solar cell simulator 7 and the solar cell simulator 8 in sequence.
According to each power end, the power supply equipment ends corresponding to the same point number are the same, so that a final power point number distribution scheme can be obtained, and the specific design result is shown in table 4.
TABLE 4 design scheme for power transmission point number of satellite terminal of drop-off electric connector
Those skilled in the art will appreciate that those matters not described in detail in the present specification are well known in the art.
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