JPH0670485A - Power controlling equipment of artificial satellite - Google Patents

Abstract

PURPOSE:To avoid a shunt-abnormality when an abnormality is generated in an error signal, by providing a diode logic circuit in a shunt, which is the input circuit of the shunt, and by providing a shunt inhibiting circuit for inputting a shunt inhibiting signal to the diode logic circuit. CONSTITUTION:When on any account, an abnormality, e.g. the open-circuit of a signal line, is generated between an error amplifier 6 and a shunt 3, the state of full-shunt is generated because no signal is inputted to the shunt 3, and the state wherein the output voltage of a solar battery is made zero and no power is fed to the loads of a satellite is brought. Therefore, a switch 10 in a shunt inhibiting circuit 8 is switched on, and to a diode logic circuit 13 in the shunt 3, a bus-voltage 16 is fed. Equivalently, the value of the error signal 18 inputted to the shunt 3 becomes the bus-voltage 16, i.e., the maximum value of the error signal 18, and it operates so as to inhibit a shunting operation. Also, even when the abnormality is a short circuit, by virtue of the diode logic circuit 13 in the shunt 3, the shunting operation is inhibited without affecting the operation of the shunt inhibiting circuit 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power control device for keeping a power supply voltage in an artificial satellite constant.

[0002]

2. Description of the Related Art A conventional device of this type is shown in FIG. In the figure, 1 is a solar cell that generates electric power from an artificial satellite, 2 is a diode, 3 is a shunt that consumes extra power, 4 is a solar cell paddle drive device, 5 is a slip ring, and 6 is a fluctuation of bus voltage. An error amplifier for detection, 7 is a load on the artificial satellite, 16 is a bus voltage, and 17 is a bus voltage return. FIG. 5 shows a conventional device,
This is a redundant system for safety, and 18 is an error signal and 19 is a signal return.

Next, the operation will be described. The power control device of the artificial satellite supplies the generated power from the solar cell 1 to the load 7 in the artificial satellite, that is, various electronic devices as a bus voltage 16 via the slip ring 5. When the satellite load 7 is small, the bus voltage 16 rises, so the error amplifier 6
The voltage rise is detected by the error signal 18 and the slip ring 5
Input to shunt 3 via. The shunt 3 receives the error signal 18 and short-circuits the output of the solar cell 1 to prevent a voltage rise, and keeps the bus voltage 16 constant. On the contrary, when the satellite load 7 increases and the bus voltage 16 drops, the shunt 3 is released to prevent the voltage drop and the bus voltage 16 is maintained constant. Further, in this type of device, in order to prevent malfunction due to poor contact of the slip ring 5, in the conventional device, the slip ring 5, the shunt 3 and the like have a redundant configuration as shown in FIG.

[0004]

However, in the conventional device of this type, when the output of the error amplifier 6 is short-circuited to the ground 17, the signal return 19 or the like for some reason, the shunt 3 operates and the output of the solar cell is reduced. There is a problem that the electric power cannot be supplied to the satellite load because the voltage of zero, that is, the bus voltage 16 becomes zero volts. Further, although the slip ring and the like are made redundant, when they are opened at the same time, there is a problem that the shunt 3 also operates and power cannot be supplied to the satellite load 7.

The present invention has been made to solve the above problems, and an object thereof is to obtain a power control device capable of avoiding a shunt abnormality when an abnormality occurs in an error signal. It is a thing.

[0006]

The power control apparatus according to the present invention has a diode logic for preventing the redundant system from being affected even if an error signal from the error amplifier is abnormal. In addition, by providing a circuit for inputting a signal for inhibiting the shunt operation, or a limit circuit or a cutoff circuit for the error signal from the error amplifier, a power control device for avoiding the loss of the bus voltage at the time of abnormality is provided. To do.

[0007]

The power control device according to the present invention can avoid the loss of the bus voltage even if the error signal from the error amplifier is abnormal.

[0008]

EXAMPLES Example 1. An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 6 is an error amplifier for detecting the fluctuation of the bus voltage in the artificial satellite, 4 is a solar cell paddle drive device, 5 is a slip ring for transmitting an error signal,
3 is a shunt that consumes extra power due to the error signal from the error amplifier, 8 is a shunt inhibit circuit that prohibits shunt operation when the error signal is abnormal, 9 is a fuse,
Reference numeral 10 is a relay for turning on / off a signal, 11 is a resistor, 12 is a diode, and 13 is a diode logic.

Next, the operation will be described. The constant control of the bus voltage by the error amplifier 6 and the shunt 3 is the same as in the conventional device. Here, consider a case where an abnormality, for example, an opening of the signal line occurs between the error amplifier 6 and the shunt 3 for some reason. Since no signal is input to the shunt 3, the shunt 3 is in the full shunt state, the solar cell output voltage is zero, and the satellite load 7 is not supplied with power. Therefore, when the switch 10 in the shunt inhibit circuit 8 is turned on and the bus voltage 16 is supplied to the error signal 18, the error voltage 18 to the shunt becomes the bus voltage 16, that is, the maximum value, and the shunt operation is prohibited. Further, the diode logic 13 in the shunt 3 can inhibit the shunt operation without affecting the operation of the shunt inhibit circuit 8 even if the above abnormality is a short circuit. Further, the shunt inhibit circuit 8 has a protective fuse 9 and a diode 12 to protect the bus voltage against an abnormality in the shunt 3.

Embodiment 2. FIG. 2 shows another embodiment of the present invention. In the figure, 14 is a constant current diode that limits the output current of the error amplifier 6.

Next, the operation will be described. Keeping the bus voltage constant by the error amplifier and the shunt is the same as the operation of the conventional device. Here, consider a case where a signal is released between the shunt 3 and the error amplifier 6. In that case, the redundant signal line allows the operation to continue without any problem. Next, consider the case where a short circuit occurs in the above line. In this case, the signal of the redundant system is used by the diode logic 13 in the shunt, and the signal of the redundant system is suppressed by the current on the short side by the constant current diode 14, which has no influence on the operation on the redundant side. It has no effect. Therefore, even if an abnormality occurs in the signal line between the shunt 3 and the error amplifier 6, the redundant line continues the operation.

Embodiment 3. FIG. 3 shows still another embodiment of the present invention. In the figure, reference numeral 15 is a switch for turning on / off the output current of the error amplifier 6.

Next, the operation will be described. Keeping the bus voltage constant by the error amplifier and the shunt is the same as the operation of the conventional device. Here, consider a case where a signal is released between the shunt 3 and the error amplifier 6. In that case, the redundant signal line allows the operation to continue without any problem. Next, consider the case where a short circuit occurs in the above line. In this case, if the signal short-circuited by the switch 16 is separated, the diode logic 13 in the shunt uses the signal of the redundant system and the operation of the signal on the redundant side is continued. Therefore, even if an abnormality occurs in the signal line between the shunt 3 and the error amplifier 6, the redundant line continues the operation.

[0014]

As described above, according to the present invention, even if an abnormality occurs between the shunt and the error amplifier in the redundant connection between the diode logic in the shunt and the shunt / error amplifier and the corresponding circuit, the abnormal operation occurs. Since the operation is prohibited or the operation is continued by the redundant system, it is possible to provide a safe and highly reliable artificial satellite power supply system.

[Brief description of drawings]

FIG. 1 is a connection diagram showing an embodiment of the present invention.

FIG. 2 is a connection diagram showing another embodiment of the present invention.

FIG. 3 is a connection diagram showing still another embodiment of the present invention.

FIG. 4 is a block diagram showing an operation of a conventional device.

FIG. 5 is a connection diagram of a conventional device.

[Explanation of symbols]

 1 solar cell 2 diode 3 shunt 4 solar cell paddle drive device 5 slip ring 6 error amplifier 7 satellite load 8 shunt inhibit 9 fuse 10 switch 11 resistor 12 diode 13 diode logic 14 constant current diode 15 switch 16 bus voltage 17 bus voltage return 18 Error signal 19 Signal return

Claims (3)

[Claims] 1. An electric power control device for controlling the electric power of an artificial satellite, comprising: an error amplifier for detecting a fluctuation of a bus voltage of the satellite; and a shunt for receiving the error amplifier signal.
A diode logic which is an input circuit of the shunt,
An artificial satellite power control device comprising an inhibit circuit for inputting a shunt prohibition signal to the diode logic. 2. The power control device according to claim 1, wherein a constant current diode is provided at the output of the error amplifier. 3. The artificial satellite power control apparatus according to claim 1, further comprising a switch provided between the error amplifier and the shunt.