JPS61218954A - Electrostatic discharge detector - Google Patents

Abstract

PURPOSE:To detect a magnetic flux caused by an electrostatic discharge in a wide scope by fitting the 2nd conductor on the 1st one back to back. CONSTITUTION:The 1st conductor 1 and the 2nd conductor 7 are combined so that their induced currents can be reverse and one ends of opening terminals of the conductors 1 and 7 are connected by the 3rd conductor 8. These conductors 1, 7 and 8 comprise a detector 9. Here, if a transient flux passes in a direction A, only the 1st detector 3 can obtain a positive transient signal. When the transient flux passes in a direction B, only the 2nd detector 10 obtain the positive transient signal. Accordingly detection signals inputted to an integrating circuit 4 become the positive transient signal always irrespective of the direction of the flux, and are counted by a counter circuit 6.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electrostatic discharge detection device for detecting electrostatic discharge.

It is well known that when a cosmic horn body such as an artificial satellite operates in space, static and electrical charges occur due to interaction with space plasma, resulting in electrostatic discharge. When electrostatic discharge occurs, the surface material of the cosmic corneal body deteriorates and malfunctions occur due to electromagnetic interference, so measures to prevent electrostatic discharge have been actively researched in recent years.

This invention is a book that relates to an apparatus for detecting such electrostatic discharge, and particularly to an improvement in the structure of the detection section thereof. Note that this type of device is mounted as mission equipment on various artificial satellites to acquire data.

[Conventional technology]

Figure 2 shows, for example, the literature (summary of gnvi).
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encesMeeting) K is a configuration diagram showing a conventional electrostatic discharge detection device. In Figure 9, (1) is a conductor made by bending a strip-shaped thin metal plate so that its cross section is U-shaped, and (3) is a diode, etc. The detector is connected to the open end of the conductor (1) with a wire (2). (4
) is an integrating circuit that integrates the output signal of the detector (3), and (5
) is a waveform shaping circuit that shapes the integral waveform of the integrating circuit (4), and (6) is a counting circuit that counts the output of the waveform shaping circuit (5).

A conventional electrostatic discharge detection device is constructed as described above, and when a magnetic flux generated by an electrostatic discharge passes through the space surrounded by the conductor (1), for example in the direction of the person shown in FIG.

An induced current occurs in the conductor (1), which is detected by the detection circuit (3).
The signal is detected by the integrator circuit (4) and the waveform shaping circuit (5), and then counted by the counter circuit (6). Therefore, the number of occurrences of electrostatic discharge can be measured.

[Problems to be Solved by the Invention] In the conventional electrostatic discharge detection device as described above, there is a problem in that when the magnetic flux points in the opposite direction, the induced current flows in the opposite direction and is not detected. Because the direction of the electric current flowing on the surface of a spacecraft due to electrostatic discharge is not determined.

The ability to detect magnetic flux in only one direction, as in the past, is insufficient in detection ability, and improvements have been desired.

The present invention was made to solve these problems, and an object of the present invention is to obtain an electrostatic discharge detection device with fewer restrictions on the directionality of magnetic flux.

[Means for solving problems]

The electrostatic discharge detection device according to the present invention includes a first conductor formed by bending a band-shaped metal conductive plate so that its cross section is U-shaped; a second conductor attached back to back; a third conductor connecting one end of the open side of the first and second conductors, respectively;
The first and second wave detectors are respectively connected to the other open ends of the first and second conductors.

[Effect]

In this invention, since the first conductor and the $2 conductor are combined so that the induced currents are in opposite directions, a detection signal can be obtained regardless of the direction of the magnetic flux passing through each.

〔Example〕

FIG. 1 is a block diagram of an electrostatic discharge detection device showing an embodiment of the present invention. In FIG. (2) is the wire, (3) is the first detector, (4) is the integrating circuit, (5
) is a waveform shaping circuit, (6) is a counting circuit, and (7) is a second conductor made by bending a strip-shaped thin metal plate having the same structure as the first conductor + 1) so that its cross section is U-shaped.

It is placed back to back with the first conductor (1). That is, the first conductor (1) and the second conductor (7) are combined so that the induced currents are in opposite directions K. (8) is a third conductor that connects one end of the open end of the first conductor (1) and the second conductor (7). The above-described first conductor (1), second conductor (7), and third conductor (8) constitute a detector (9).

The wire (2) is connected to one end of the open end of the second conductor (7).
).

In the electrostatic discharge detection device configured as above 5,
In FIG. 1, when a transient magnetic flux passes in the direction of A, only the detector (3) K of gX1 obtains a positive transient signal. Next, when a transient magnetic flux passes in the direction of B.

A positive transient signal is obtained only at the second detector OI. Therefore, the detection signal input to the integrating circuit (4) always becomes a positive transient signal regardless of the direction of the magnetic flux, and is counted by the counting circuit (6).

Note that the configuration and operation of the integrating circuit (4), waveform shaping circuit (5), and counting circuit (6) may be well-known.

〔Effect of the invention〕

As described above, the present invention has the effect of detecting magnetic flux generated by electrostatic discharge over a wide range of buttons with a simple structure in which the first conductor and the second conductor are attached back to back.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional electrostatic discharge detection device. In the figure, (l) is the first conductor, (2) is the wire, (
3) is the first detector, (4) is the integrating circuit, (5) is the waveform shaping circuit, (6) is the counting circuit, (7) is the second conductor, (
8) is the third conductor, (9) is the detector, and a. is the second detector. Note that the same reference numerals in Figure 9 indicate the same or corresponding parts.

Claims (1)

[Claims] A first conductor formed by bending a strip metal thin plate so that its cross section becomes U-shaped; and a first conductor formed by bending a strip metal thin plate so that its cross section becomes U-shaped, which is attached back to back with the first conductor. The second conductor is connected to one end of the open side of the first conductor and the second conductor, respectively. A third conductor is connected to each of the other ends of the open side of the first conductor and the second conductor, and is generated by magnetic flux passing through each of the spaces surrounded by the first conductor and the second conductor. An electrostatic discharge detection device comprising: the first detector and the second detector configured to detect induced current.