JPS6321063Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to, for example, an artificial satellite, and particularly relates to a redundant abnormality detection device for detecting an abnormality in a plurality of redundant devices.

As is well known, artificial satellites require extremely high reliability due to their nature. Therefore, important devices are provided with multiple identical devices, for example two redundant ones.
Satellite functions can be maintained with at least one device alone.

FIG. 1 shows a case where a conventional overcurrent interrupting element, for example fuses 11 and 12, is inserted in parallel between a power supply section 13 and a load section 14.
Nos. 1 and 12 melt at the same current value.

By the way, it is difficult to reliably inspect the fuses 11, 12, etc., which are provided redundantly in this way, before launch. That is, since the fuses 11, 12, etc. are provided inside the satellite main body, it is impossible to visually see them between the complicated circuits.
Therefore, it may be possible to conduct an electrical test, but
Among the fuses 11 and 12 provided in parallel,
It is extremely difficult to judge if either of them is refused.

This invention was made based on the above circumstances, and its purpose is to provide a redundant abnormality detection device that has a simple configuration and is capable of detecting abnormal conditions in redundant devices. It is something to do.

An embodiment of this invention will be described below with reference to the drawings.

In FIG. 2, reference numerals 21 and 22 are overcurrent interrupting elements, such as fuses, inserted in parallel between the power supply section 23 and the load section 24. Of these, a diode 25 is connected in series between the fuse 22 and the load section 24 with the polarity shown. Test terminals 26, 27, and 28 are provided at the cathode of the diode 25 and at both ends of the fuse 22, respectively.

In the above configuration, when the fuse 21 is inspected, the inspection circuit shown in FIG. 3a is used. That is, a current limiting resistor 32, an ammeter 33, and a DC power source 34 are connected in series between the terminals 30 and 31 with the polarities shown, and the terminals 30 and 31 are connected to the terminal 2.
6 and 28. However, diode 2
5 is reverse biased, so DC power supply 3
The direct current supplied from 4 does not flow to the fuse 22, but only to the fuse 21, so that the fuse 21 can be inspected. In this case, the voltage of the DC power supply 34 is equal to the forward voltage of the diode 25.
It is desirable to set it to V _F or less (approximately 0.5 [V] or less).

Further, when inspecting the fuse 22, as shown in FIG. 3B, the polarity of the DC power supply 34 in FIG. 3A is reversed and the terminals 30 and 31 are connected to the terminals 27 and 28. In this case, since the diode 25 is biased in the reverse direction, the DC power supply 34
The current supplied from the fuse 21 does not flow to the fuse 21,
It is possible to test the fuse 22 by flowing only through the fuse 22.

According to the embodiment described above, a diode 25 is provided in series with one of the fuses 21 and 22 provided in parallel, and the DC power supply 34 is connected so that this diode 25 is always reverse biased. , fuses 21 and 22 can be individually inspected. Therefore, since the configuration is extremely simple and only requires the diode 25, it has almost no effect even in cases where weight is a serious issue, such as in artificial satellites.

As described in detail above, according to this invention, it is possible to provide a redundant abnormality detection device that can easily detect an abnormal state of redundant devices with a simple configuration.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an example of a conventional redundant system, Fig. 2 is a block diagram showing an embodiment of an abnormality detection device for a redundant system according to the present invention, and Figs. 3a and 3b are block diagrams showing the inspection circuit of Fig. 2. 21, 22 ... fuses, 25 ... diode.

Claims (1)

[Scope of utility model registration request] It comprises two overcurrent cutoff elements inserted in a circuit and connected in parallel, and a diode connected in series to one of the overcurrent cutoff elements, and a diode is provided at both ends of each of the overcurrent cutoff elements connected in parallel. A redundant abnormality detection device, characterized in that a DC power supply is supplied in a direction opposite to the diode, and a conduction state of an overcurrent cutoff element is detected.