JPS58193472A - Detector signal processing circuit with abnormality diagnosis apparatus - Google Patents

Abstract

PURPOSE:To achieve an abnormality diagnosis of a detector freely as desired by inputting a terminal voltage of a detector into a comparator in which an upper limit voltage and a lower limit voltage are preset detecting it to output an abnormality signal according to the disconnection and short-circuiting thereof. CONSTITUTION:Output of a detector S is inputted into a signal processing section P via a switch S3 for separating input signal only when calibrated. A resistance (r) and voltage comparators CH and CL compose an abnormality diagnosis apparatus. In the abnormality diagnosis, after the S2 is turned OFF and the S3 turned ON, a calibration power source VR is connected to the detector S through the resistance (r). When the detector suffers disconnection, the terminal voltage Vi=VR is applied and when it makes short-circuiting, Vi=0. Vi is inputted into a comparators CH and CL to be compared with the preset upper voltage VH and lower voltage VL. When the detector suffers disconnection, an abnormality signal H is detected and when it makes a short-circuiting, an abnormality signal L is outputted.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a detector signal processing circuit, and more particularly to a processing circuit having a function of diagnosing abnormal conditions such as disconnection, short circuit, leakage, or change in internal resistance of a detector.

In conventional detector signal processing circuits and processing circuits used for % trap fusion related pressure, no particular consideration was given to failures such as disconnection of the detection part, and the environmental conditions for installing the detectors were good, so it was rare, but in recent years In large-scale nuclear fusion devices, detectors are often installed close to high-temperature plasma in order to improve control performance, and detector failure diagnosis becomes expensive.

An object of the present invention is to provide a detector signal processing system with an abnormality diagnosis device that can perform abnormality diagnosis of a detector arbitrarily or at all times.
DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention, which provides a zero circuit, will now be described with reference to the drawings.

FIG. 1 shows a detection FtI with an abnormality diagnosis device according to the present invention.
FIG. 3 is a configuration diagram of a signal processing tpt path. The detection unit S is equivalent to I
It is shown as an H circuit, and its internal resistance is Rk. The output of the detector 8 is connected to a switch S that disconnects the manual power signal only during calibration.
3, and is input to the signal processing sP. During calibration, S3 is turned OFF and S2 is turned ON, so that
The calibration power supply ■R is connected to the signal processing section, and the calibration of the n1 processing section becomes OJ function.

The resistor r1 and the voltage comparator CHXCL constitute a detector abnormality diagnosis device. The operation of the abnormality diagnosis function is as follows.

First, avoid connecting the calibration power supply directly to the detector.
is OFF. At the same time, 83 is turned ON. Calibration power supply V
B is connected to the detector S via @resistance r. At this time, the output impedance of the calibration 11L source V)(,
, if the human power impedance of the signal processing section is infinite, then
The current from the calibration power supply flows through the detector and its terminal voltage Vi
r: The pressure is divided by J, R and r, and becomes. If the detector is disconnected, R1-bacteria in formula a(1), and the terminal voltage vla Vi = V t<, . . .
...(2). Conversely, H1 → 0 also changes to m units where the detector is short-circuited, so the terminal voltage vi becomes Vi
=0 ・・・・・・・・・
(3) Human power is provided by Vitl Hibiki CH, CL,
It is compared with preset upper limit voltage VH and lower limit voltage VL. VH, VLtff are set as follows. Therefore,
For example, if the detector is disconnected and formula (2) is satisfied, Vi>VH'' (5), and an abnormality signal H is output. Abnormal signal H indicates disconnection in addition to detector disconnection.
Due to some reason, the internal resistance H1 of the detector increases in an equally frugal manner, and formula (5) is satisfied.One unit is also output. The set voltage that generates the abnormal signal can be changed arbitrarily by adjusting VH. (See Figure 2 (a)) On the other hand, Kaidekika is short-circuited and Catechism & is 7”<
V L °−°−°−(°ゝ,・
Next 1. #4 signal is output. As described above, the abnormal signal includes not only the detector short circuit but also the ↑# signal indicating a connecting cable short circuit or a short circuit. (
(See FIG. 2(b)) As described above, in this embodiment, in addition to the effects of the invention,
Detector abnormality diagnosis is possible.

Next, a modification of the present invention will be described below.

FIG. 3 is a configuration diagram of a detector signal processing circuit with an abnormality diagnosis device according to a modified example. The difference from the previous embodiment is the feet.
Unless a tfL power supply VC is provided and calibration is performed,
A constant current I is constantly flowing through the detector. Terminal voltage Vi (= constant current source output voltage) V i = R, I
・・・・・・・・・(7) Totoru. 9. Let vmax be the maximum output voltage of constant current power supply VC.

When the detector is operating normally, the constant current If flows against the voltage generated by the detector, and the constant current source output voltage increases by the detector output voltage, so signal processing 8t
In lp, the original detector voltage can be obtained by subtracting the voltage RI from 1.

If the detection (to) is disconnected here, vl increases to the constant current power supply maximum output ■max, and V i =Vmax −−・−
=(8). Conversely, if the detector is short-circuited, Vt=
O... (9) Therefore, by comparing Vi with the two comparators CH and CL, it is possible to diagnose the abnormality of the detector in the above embodiment. It is similar to (See FIG. 4) As described above, this modification has the advantage of being able to diagnose abnormalities in the detector even during measurement.

According to the present invention, a detection signal with an abnormality diagnosis device is capable of diagnosing an abnormality such as disconnection-1 short circuit or internal resistance change of a detector in a detection signal processing circuit at any time or at any time. A processing circuit can be realized.

[Brief explanation of drawings]

Figure 1. Detector signal processing circuit with abnormality diagnosis device (actual 1M
Example), FIG. 2, an explanatory drawing of the same operation as above, FIG. 3, a detector signal processing circuit with an abnormality diagnosis device (modified example), and FIG. 4, an explanatory drawing of the same as the above. S...Detector, 81.82.83...Selector switch, R...Detection internal resistance, r...Resistance for abnormality diagnosis, Vt(,...Calibration power supply, P...・Signal processing section, C
l-1, CL...Fig.
<b) ￥J 3 Figure f) 4- Dispute in the Figure Mine Distributor (--9 Inner Order 19.1----) υ) (b
) 141← :-

Claims (1)

[Claims] 1. In a detector signal processing circuit having a calibration power supply, the voltage of the calibration power supply is applied to the detector through a finite resistor and the resistor in series, and the voltage of the calibration power supply is applied to the detector. A detector with an abnormality diagnosis device that diagnoses disconnections, short circuits, and internal resistance changes in the detector by comparing the voltage generated at both ends of the detector with a preset 9' tortoise pressure pupil. signal processing circuit. 2 In addition to applying the calibrated power supply voltage to the detector via the resistor in the previous section 1, the foot current power supply is always connected to the standard output terminal, and the voltage generated across the detector is compared with the preset voltage. By doing so, a detector signal processing circuit with an abnormality diagnosing device is capable of performing the same abnormality diagnosis as in the previous item 1.