JP2001251026A - Control board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem of a disadvantage of maintainance of a printed board afterward because a sensing pattern for judging deterioration of a pattern of the printed board does not always corrode first in the conventional techniques. SOLUTION: A pattern with a narrower width or a narrower insulating distance than the other patterns with the same voltage is provided on one part of the printed board, thereby positively causing a disconnection due to corrosion of the pattern or a short circuit due to migration earlier than in cases of any other patterns. This pattern is incorporated into the printed board as a sensor to automatically inform a maintenance center or the like of its emergence.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a printed circuit board, and more particularly to a method of constructing a printed circuit board for detecting the progress of corrosion or migration before impairing the normal function of the printed circuit board.

[0002]

2. Description of the Related Art Conventionally, as a technique of this type, for example, as disclosed in Japanese Patent Application Laid-Open No. 10-62476, a pattern for detecting deterioration is provided on a printed board of a deterioration detecting device so as to be exposed to the atmosphere, and the voltage of the pattern is determined. There is a method of detecting the deterioration tendency by comparing with the rated value.

Further, Japanese Patent Application Laid-Open No. 9-304461 discloses a method of detecting the potential of solder at a soldering portion on an electronic control board and calculating the degree of deterioration of the control board based on the detected potential.

[0004] In Japanese Patent Application Laid-Open No. Hei 10-73629, there is a method of continuously monitoring the progress of insulation deterioration and enabling an early grasp of the state of insulation deterioration.

Further, Japanese Patent Application Laid-Open No. Hei 10-239374 discloses a method of detecting insulation deterioration based on insulation resistance between patterns provided on a substrate.

[0006] The use of the techniques described above makes it possible to detect and calculate the degree of insulation deterioration and the degree of deterioration of the substrate. Then, before the normal function of the printed circuit board is impaired, it is possible to perform maintenance in advance by detecting component replacement, board replacement, and the like.

[0007]

The use of the above-mentioned prior art makes it possible to maintain a printed circuit board. However, there is a problem that a pattern to be taken in as a sensor does not always corrode at first, resulting in post-maintenance. Therefore, an object of the present invention is to provide a printed circuit board of a lifting facility capable of solving such a problem.

[0008]

In order to achieve the above object, the present invention provides a printed circuit board with a pattern that is narrower than other wirings or a pattern that has a shorter insulation distance.

With this configuration, a disconnection due to corrosion of a pattern or a short circuit due to migration or the like occurs more reliably than other patterns first. By taking these patterns as a sensor, a printed circuit board can be obtained. Before losing the legitimate function of
It is possible to detect.

[0010]

FIG. 4 is a diagram showing an outline of an elevator.

In FIG. 1, a passenger 1 is located in a hoistway 16.
There is a car 17 used by 8 and a counterweight 15. The car 17 and the counterweight 15 are suspended by a rope 13. In addition, balance weight 1
5 is suspended by a deflecting wheel 14.
Here, the car 13 is driven by winding the rope 13 up and down by the hoisting machine 12. This hoist 1
2 is controlled by a control signal from the control panel 8. When an abnormal situation occurs, the maintenance center 11 is automatically notified.

FIG. 5 is a diagram showing the internal configuration of the control panel 8. As shown in FIG.

In FIG. 1, a control panel 8 includes an MPU board 71,
It comprises an I / O board 72, a main circuit board 73, and an automatic remote diagnosis device board 74. Here, MPU board 71 and I /
The O-substrate 72 is used to input and output elevator safety devices and the like. The MPU board 71 and the main circuit board 7
3, the inverter control is performed. Further, when an abnormal situation occurs, a signal is sent from the MPU board 71 to the automatic remote diagnosis apparatus board 74, so that the automatic remote diagnosis apparatus board 74 automatically issues an alert to the maintenance center 11.

FIG. 1 is a diagram showing a configuration of a main part of the present invention.

The "pattern" means a wiring on a substrate.

In FIG. 1, the microcomputer 1, the parallel port 2, the power supplies 31, 32, the resistors 41 and 42, the ground 5, the pattern 61 having a smaller width than the other patterns, and the patterns 62a and 62b having a smaller insulation distance than the other patterns. And 6 more
1, 62a, 62b are provided. Here, the printed circuit board 7 is the M shown in FIG.
This applies to all of the PU board 71, the I / O board 72, the main circuit board 73, and the automatic remote diagnosis apparatus board 74.
In the microcomputer 1, only the determination unit according to the present invention is described. The determination unit is for the microcomputer 1 to check the input voltage of the parallel port 2 at a certain cycle, and to execute processing for issuing an abnormal signal when the condition is satisfied. Here, the pattern 61 includes a resistor 41 by the power source 31.
A constant current is flowing to the ground 5 via. Normally, since the voltage of the pattern 61 is input to the parallel port 2, the input voltage of the parallel port 2 is at the “L” level. However, if the wire breaks due to corrosion, the pattern 61 is not connected to the ground 5. , The input voltage of the parallel port 2 becomes “H” level, and this is used as a sensor for the microcomputer 1.
Is detected by the determination unit. A constant current flows through the pattern 62a from the power supply 32 via the resistor 42. Normally, since the parallel port 2 is connected to the power supply 32, the input voltage of the parallel port 2 is at “H” level.
Since the pattern 62a and the pattern 62b are connected to the ground 5, the input voltage of the parallel port 2 becomes "L" level, which is detected as a sensor by the determination unit in the microcomputer 1. Regarding these detection methods, a method of detecting a resistance change of the pattern using an AD converter or a comparator, and detecting the change in resistance when the resistance value becomes equal to or more than a predetermined value by a determination unit in the microcomputer 1 as a sensor. There is also. With such a configuration, the patterns 61, 62a, and 62b are corroded or disconnected before any other pattern. Therefore, before the normal function of the printed circuit board is impaired, the patterns 61, 62a, and 62b are detected beforehand and fail. Maintenance can be performed before.

FIG. 2 is a diagram showing locations where patterns are provided as the embodiment of FIG. 1 of the present invention.

In FIG. 1, patterns 61, 62 a and 62 b provided on a printed circuit board 7 in a control panel 8 are provided near a fan 9. Alternatively, a pattern may be provided near the opening instead of the fan 9.

FIG. 3 is a diagram showing locations where patterns are provided as the embodiment of FIG. 1 of the present invention.

In FIG. 1, patterns 61, 62a and 62b provided on a printed circuit board 7 in a control panel 8 are IP
Provide near a high temperature part such as M10.

The reason why the antenna is installed in the place shown in FIG. 2 or FIG. 3 is that disconnection due to pattern corrosion and short circuit due to migration and the like easily occur in the control panel 8.

By adopting the above-mentioned configuration, it is possible to reliably perform advance detection before the normal function of the printed circuit board is impaired and to perform maintenance before an accident occurs, with almost no new components added. Becomes As a result, high reliability for the printed circuit board can be established, so that it is possible to significantly reduce costs such as varnishlessness.

[0023]

According to the present invention, a pattern in which a disconnection of a pattern or a short circuit due to migration or the like is provided before any other pattern is provided, and the pattern is used as a sensor so that the regular function of the printed circuit board is provided. Before losing,
It is possible to preliminarily / detect and alert the maintenance center or the like before a failure occurs to perform maintenance.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a main part as an embodiment of the present invention.

FIG. 2 is a diagram showing locations where patterns are provided as an embodiment of the present invention.

FIG. 3 is a diagram showing locations where patterns are provided as an embodiment of the present invention.

FIG. 4 is a diagram showing the overall configuration of an elevator.

FIG. 5 is a diagram showing an internal configuration of a control panel 8;

[Explanation of symbols]

1 ... microcomputer, 2 ... parallel port, 5 ... ground, 7 ...
Printed circuit board, 8 ... Control panel, 9 ... Fan, 10 ... IP
M, 11: maintenance center, 12: hoisting machine, 13: rope,
14 ... deflector car, 15 ... balance weight, 16 ... hoistway, 17 ... car, 18 ... passenger, 31-32 ... power supply, 4
1 to 42: resistor, 61, 62a, 62b: pattern, 7
1. MPU board, 72 I / O board, 73 main circuit board, 74 automatic remote diagnosis device board.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masayuki Hirose 1070 Ma, Hitachinaka City, Ibaraki Prefecture Inside Mito Works, Hitachi, Ltd. Inside Mito Plant (72) Inventor Akira Onuki 1070 Ma, Hitachinaka-shi, Ibaraki Prefecture F-term in Mito Plant, Hitachi, Ltd. LL09

Claims (5)

[Claims] 1. A control panel provided with a printed board, comprising: a pattern provided on the printed board and having a width narrower than other patterns of the printed board; and means for detecting an abnormality of the pattern. 2. A control panel provided with a printed circuit board, comprising: a pattern provided on the printed circuit board and having a width that is shorter than another pattern of the printed circuit board in width and a means for detecting an abnormality of the pattern. Board. 3. A control panel provided with a printed circuit board, comprising: a component provided on the printed circuit board, the component being more susceptible to deterioration than other components of the printed board; and means for detecting an abnormality of the component. 4. A printed board provided with a pattern provided on a part of the board and having a width narrower than other patterns on the board, and means for outputting the state of the pattern to means for detecting an abnormality of the pattern. 5. A printed circuit board comprising: a part provided on a part of the board; the part being more easily degraded than other parts on the board; and means for outputting the state of the part to means for detecting an abnormality of the part.