JPS60162418A - Power source of artificial satellite - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a power supply device for an artificial satellite that obtains electric power by connecting a solar cell array to the main body of the artificial satellite.

[Prior art]

Conventional multiple solar cells? ! - Obtain power by connecting the solar battery array to the entire satellite body in a generous combination.In a satellite, two methods are usually considered to control the output of the solar battery array to a DC voltage within a certain range. It is being The first method is as shown in Fig. 1, where the shunt tap is connected to the solar cell 71/I (for control) (
2a) (2bX2C).

All the outputs are coupled together and guided to the shunt circuit (7) in the satellite body via the slip ring (5) and the error amplifier (6).
.

The output of the shunt circuit (7) must be used to control the current and voltage (8) by changing the current flowing through the shunt circuit (7).

In other words, in Figure 1, (1c%1b) (1c) is thick 1
Kan'Kameike array, (2a) (2b) (2c) are solar and
River, pond array (for control), (3a) (31)) (3ri and (4a) (4b) (4c) are backflow prevention diodes,
(5) is a slip link for constantly electrically connecting the solar array and the satellite main body to the sun'l-1 pointing toward the sun, (6) is an error multiplier [1], and (7) is a shunt circuit. , (8) is the output voltage and solar cell array (1a) (1
b) (1c) and solar cell array (2a%2b) (2C
) is added to the total solar output 'sleeping pond output military pressure or solar radiation.

The error increaser (6) takes full advantage of the non-Uj linear characteristics of the solar cell, which is determined by increasing the load force of the pond.
and the shunt lol path (7) υ hence the output part, pressure 7
3. Solar cell array (for control g<+) so that it is at or below a certain value This is a method of controlling the output voltage (8) of i1 within a certain range.

In the above example, solar cell array (1a) (1'1J)
(40° and thick 1-angle square, pond array (for jlf control)
(2a) (2b) (2c) There are three grapes each, but the number is not necessarily limited. In addition, although the shunt circuit is placed inside the satellite body, it is also possible to place it on the side of the 1-pocket array rather than the slip ring of the shunt circuit. It is necessary to derive the circuit. As is well known, this first method requires a large generation of solar five-pond arrays.
−) according to the “shunt voltage” (solar array (j'
output 11j, pressure) of ali (for public use) and "shunt city, flow"
(Backflow prevention diode (4a) (4b) (4c) f flowing box.

In other words, the shunt capacity becomes larger, which makes circuit design and component selection more difficult. Furthermore, the amount of heat generated by the shunt circuit increases, making it difficult for people to
tI HoshimotobomotoThe disadvantage is that it is accompanied by difficulties on the side of the bomoto regime.

The second method is to connect 7y number of shunt circuits (7a) (7b) (7c) to solar cell arrays (for *lli+l) (2a) (2b) (2c) as shown in Figure 2.
Connect K in parallel to drive circuit (9a) (9b) (
9, the output of error multiplier (6) -26 force 1
1. Compare the impedance of each shunt circuit (7a) (7bX7c) with the predetermined operating reference level to 1.
By controlling No. 10, the output voltage (8) is controlled within a constant voltage range, and the shunt (b) path (7a) (71)
) (7C) This method completely reduces the total amount of power consumed.

1″, that is, in FIG. 2, (1a) (Ib) (IC,
) is a solar cell array, (2a) (2b) (2C) is a solar cell array (for control j), (5Ft) (31)) (
6c) and (4a) (4b%4c) are diodes for backflow prevention and parallel connection of solar cell arrays, (
5) is the slip ring that connects the main body of the satellite with the 1st field girder array and shunt circuit, and (6) is the output voltage (
8) Error amplifier that detects and increases errors from the desired range, <7a) (7b) (7c) are solar cell arrays (for control) (2a) (2b) (2c) K-compatible 1-row shunt circuit , (8) is its output voltage, (9a) (9b) (9
c) is the shunt circuit (7a) (7) when the output signal of the error intensifier (6) exceeds a predetermined level.
b) (This is a shunt drive circuit that drives seven FTL arrays. Figure 2 shows the case where there are three FTL arrays (FTTL, for control) all around the circuit, as in Figure pA1, but of course the number of There are no restrictions.In the method shown in Figure 2, the three shunt circuits (7a) ('b) (7c) do not operate simultaneously, but instead operate in correspondence with the output signal of the error amplifier (6). operating axis of each shunt drive circuit (9a) (9b) (9c).

If the error signal is larger than the shunt circuit (7a
) (7b) (7c) so that the impedance is sufficiently low. As the output signal of the Tenawaji error amplifier (6) increases, the shunt drive circuit (9a) first operates within the operating range π.The impedance of the shunt circuit (7a) gradually decreases from a very large value, but the shunt drive circuit (9
b) and the shunt drive circuit (9C) do not operate again, and the shunt circuit (7b) and the shunt drive circuit (7C) [Route 61 (7C)
The impedance of the shunt drive circuit (9) remains very large, and the error increases to the first order.
When the operating range a) is exceeded, the impedance of the shunt drive circuit (9b) or the shunt circuit (7b) entering the operating range gradually decreases from a very large value. At this time, the shunt drive circuit (9C) does not operate. On the other hand, the shunt circuit (
Since the impedance of 7a) is sufficiently low, almost all of the output current of the solar cell array (for control) (2a) flows into the shunt circuit (7a) and the solar cell array (for control) (2a). ) has a very small value and therefore the shunt circuit (7a
) has a small calorific value.

In this way, the shunt drive circuit (9a) (9b) (9c)
operate in sequence in response to the output signal of the error multiplier (6).

The output signal of the error amplifier (6) is transmitted to the shunt drive circuit (9a
) (91)) (9C) When the voltage exceeds the operating range of the shunt circuit (7a) (7bX7c), the impedance of the shunt circuit becomes very low. Since the current flowing through the shunt circuit is very low, the amount of heat generated is small in the valve cylinder, and the impedance mechanism 5 is very good.The shunt circuit has a very small current flowing through the shunt circuit, so the amount of heat generated is also very small. 7b) The overall calorific value of (7c) is smaller than that of the first method.

In this way, the second method is different from the first method since the capacitance of the shunt circuit can be made smaller.
Fluctuations in the amount of heat generated in the shunt circuit due to changes in sea load d
] is also small, which alleviates the drawbacks of the first method. However, this second method requires a shunt drive circuit for each shunt circuit as shown in FIG. A circuit is required to compare and amplify the voltage. Although all of these circuits are generally sensitive to temperature changes, these circuits must not be connected to the solar array probe, for example on the solar array paddle in space outside the satellite body. [Shi] road vs. 1
6. The operating conditions are severe and the circuit design is therefore complicated.

In particular, as artificial satellites become larger and require larger amounts of electricity and money, battery arrays must also become larger. This increases the problem of increased line length and voltage drop, or the influence on the external W1: error amplification type output signal that is sensitive to magnetic fields.

[Summary of the invention]

This invention eliminates the above-mentioned conventional drawbacks.

As shown in FIG. 3, based on the output signal of the error multiplier (6), a shunt control circuit +10 installed in the satellite body is used to keep the output voltage (8) within a predetermined range.
The shunt circuit (7a) (yb
) (7C) to further increase or decrease the number of pieces, or to maintain the status quo, and all the information is sent as a logic signal to the solar cell array (IIll) via the slip ring (5), and this number and others are sent. The drive state of the shunt circuit (the impedance of the shunt circuit is very low, = o+i state, and the impedance is all very high, the state is OFF)) All combinations 1. The drive state of the lower shunt circuit (ON or OFF) How many circuits should be shunted in each shunt circuit?The shunt logic drive circuit determines the shunt logic drive circuit (status).The number of circuits to be shunted is determined for each shunt circuit.The number of circuits to be shunted is controlled to increase or decrease sequentially, and the output of the solar cell array is controlled within a constant range. It is something.

In this invention, in the shunt drive circuit, there is no need for a reference voltage generation circuit or an amplification circuit for comparing them and an error of 1 g, and it is possible to increase/decrease the number of shunt circuits of the artificial + To star main rod main body. For example, the total number of shunt circuits (the total number of circuits) can be determined and the output voltage of the solar cell array can be controlled only by the combination logic with the driving state (ON or OFF state) of the adjacent shunt circuit. method).

In other words, the shunt circuit is in the 019 state with a very low interference turn or the OF state with a very high interference turn.
Since the shunt is in either the F state, the heat generation of the shunt as in the first method is extremely small.

In addition, the shunt control signals are all digital signals of 0N10FF status signals or logic signals, so as in the second method, the heat control of the shunt circuit and shunt drive circuit can be concentrated in one place. (It has the characteristic that it can eliminate the complexity of wiring and the difficulty of circuit design and adjustment for demand compensation.

[Embodiments of the invention]

Figure 3 is a configuration diagram of the satellite power supply device according to the invention of C. In the figure, (9aX9b) (9C) is a shunt logic drive circuit, (101 is an output signal based on the output signal of the error amplifier (6) Voltage (8) Decide whether to increase or decrease the number of shunt circuits that should be activated within the specified voltage range, and whether the signal is derived to the solar cell array side. Use the shaft control circuit α1) as necessary.

Funtensa for smoothing, 03. +13 is a command signal for increasing and decreasing the number of operating shunt circuits from the shunt ati and control circuit (IIll), respectively. 1For example, when increasing the number of shunt circuits, the command signal 0
2 is in the "1" state, u'2 is in the "0" state, and when the number of shunt circuits is completely reduced, Q21 is in the all "0" state, α3 is in the "1" state, and increase/decrease 77 L. Q2. Is it okay to use stay No. 2318, which has both α-moats and 0”? (14a
%14b) (14C) respectively indicate the shunt drive state (1 status) from the signals U*, α and the adjacent shunt logic drive circuit (9a) and (9b) (9) i7 (15a) (15b) (1
5C) and (16a) (16b) (16c) fgd, a shunt circuit ('7a
) (7b) (7c,) 'iQ N, OF F7 shunt circuit drive No. 48, (15a) (15b) (15c)
are shunt logic drive circuits (9a), (9b), and (s), respectively.
+c) Status signal indicating the ON state of the shunt drive (logically the same as (14a) (14b) (14c)), (16a) (16b) (16C)
are shunt logic drive circuits (9a) (9kl) (
9C) is a status signal indicating the junction drive OFF state.

In the example of C, the number of shunt circuits is three, but the number is not limited. First, if we consider the case where the load on this power meter is light, the output voltage (8) will be lower than the predetermined voltage when we assume that the nonlinear characteristics of the solar cell do not cause closed-loop control noise. (6) An error signal sound is generated which indicates that the first circuit should be activated.

Based on this signal, the shunt ftt control (b) path (1,
0+ naturally generates a control output to increase the number of actuated shunt circuits. This signal is converted into a digital signal of status control or logic symbol V and sent to the shaft logic drive circuit (9FL) (9b) (9c) via the slip ring (5) as a command to increase the number of shaft circuits LI@ (12).
K is input.

On the other hand, at this time, the shunt circuit number reduction command signal (13 is generated and 7 is not generated.Full explanation k 1M + 1 to be simply done)If both shunt circuit drive signals (14S (14b) and (14c) are in the OFF state, the shunt logic drive circuit (9a) is the above-mentioned shunt circuit number increase command signal (12 is "1", so the shunt circuit drive signal (14a) is all ° ° 1
” and the shunt circuit (7) ((0) and the status signal (15a) indicating the shunt and drive ON state.
) from "o" to °1". In the shunt logic drive circuit (9b), the above-mentioned shunt i-bar operation ON state is changed to 1-
The logic of the status signal (15a) and the operating shunt number increase command signal +13 is taken into account. In other words, if the increase command signal 112 is in the "1" state, the shunt circuit drive signal (
14b) i”°1″ state and shunt circuit (7b
) is also ON. When the increase command signal llz changes to 0, the shunt circuit drive signal (14b) remains at 0, and the shunt circuit (7b) remains OFF.
reactor. In this way, by sequentially turning on the shunt circuits (7a) to (7b) (7C) depending on the state of the increase command number O2, the output voltage (8) becomes below the predetermined value. On the other hand, if the load on the power source device is heavy and the number of shunt circuits is large in ?zk, a command signal Oj to reduce the number of activated shunt circuits is generated.For example, shunt circuits (7a) (7b) (7c, ) Assuming that both are in the KO14 state, the shunt logic drive circuit turns the shunt circuit drive signal (14) from "1" to °°0" and turns the shunt drive OFF at the same time as the shunt circuit (7c) 5a-py-v.
The status key signal (16C) indicating state 7 is generated (in this example, it is changed from 0 to 1).
Even in this state, an interrupt command to further reduce the number of shunt circuits is generated (2), a status signal indicating the shunt drive OFF state in the logic drive circuit (9b). Decreasing the number of circuits /8? Performs the AND of the signal Q31 and obtains the shunt circuit drive signal (14b) <゛0'', shunt circuit (near b) i
Set the state to 07F and increase the output and pressure (8).

Thereafter, by turning off the 1111-order shunt circuit 2 in the same manner, the output voltage is controlled so that the output voltage 5 falls within the fixed value.

〔Effect of the invention〕

As described above, C (according to this invention, the satellite main body, solar cell array side, and q control signals are digitized, and the shunt drive logic is based only on the logic between those signals and the drive state of the adjacent shunt circuit. Since it can be used as a determinant, it is possible to install shunt circuits and shunt logic drive circuits separately in the vicinity of each solar array. Even if the solar cell array has a large area, it is possible to reduce the number of unnecessary wiring in the shunt circuit and eliminate the effect of one line drop, which is especially important for the 1,000 satellites that require a large amount of electrical power. In the above example, the solar cell array (1a) (I
b) (IC) and solar cell array (for control) (2a) (
2b) (2C) Although the explanation has been made using a partial shunt method with k distinctions, the present invention can also be applied to a full shunt method in which the entire solar cell array is controlled with all shunts. Matashunt control circuit H and shunt logic drive circuit (9
a) Although (9b) and (90) are all shown in one circuit system, in actual application, from the viewpoint of reliability and fail-safety, a majority logic circuit is adopted, and a fault is detected and the logic is inhibited or bypassed. All the processes such as
: It is something that is done.

[BRIEF DESCRIPTION OF THE DRAWINGS] Figs. 1 and 2 are diagrams for explaining a complete explanation of a conventional power supply device for an artificial satellite, and Fig. 3 is a diagram showing an embodiment of a power supply device for an artificial satellite according to the present invention. . In the figure (1a) (Ib) (1c
) Its solar array, (2a) (2b) (2c)
are solar cell arrays (for control), (6a) (3b) (3
c) is a backflow prevention diode, (4a) (4b%4C)
is a backflow prevention diode (for shunt), (51 is a slip ring, (6) is an error amplifier, (7) is a shunt circuit, (8) is a gage voltage, (9a) (9b) (9c) is a shunt drive 1 circuit, 00) is a shunt control circuit, (+1) is a smoothing capacitor. Identical or Buddhist priest parts are indicated with the same reference numerals.7-19 Agent Masuo Oiwa'3s K.

Claims (1)

[Claims] The output voltage of the solar cell array is compared with a preset reference voltage, and the output voltage of the solar cell array is compared with a preset reference voltage. An error amplifier that generates a difference signal, a plurality of shunt circuits connected correspondingly to the solar cell arrays on the side of the number of axes, and the number of shunt circuits that should be activated based on the output signal sound of the error amplifier. A shunt control circuit that generates all water signals for the increase and decrease of A TA power supply device for an artificial satellite, characterized in that it is equipped with a plurality of shunt logic drive circuits that operate all the corresponding shunt circuits in combination to keep the output voltage of the solar cell array constant.