JPS59133794A - Driving system of switch matrix - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a switch matrix drive method when a constant current drive switch matrix is used in a space-divided communication path switch of an electronic exchange.

An example of a conventional general switch matrix drive system is shown in FIG. In Figure 1, SWo~SWn is 8×8
This shows the drive coil section of the switch matrix, which has 8 X coils and 8 Y coils. Xo%X is a drive line on the level selection side that selects the 8 circuits of the X coils of the switch matrix, and XR indicates the drive line on the return side.

Further, Yo%Y7 is a level selection drive line for selecting the eight Y coils of the switch matrix, and YR is its return drive line. In addition, the level selection side drive line
o -X 7 1 Y o -Y 7 and return side drive lines XR and YR are respectively drive coil parts swo-s
pSr0 to pSrn are contacts of a non-illustrated selection relay for selecting the drive coil sections 5Wo-8Wn.

Now, to specify the Atsuta f cross point, /4'
Selection IJ relay contact psri (i ”” O~n),
Level selection side drive line X (J=0 to 7), Yk (k=0
-7), only one point is specified for the drive coil 19 section 5WiO input level j and output level, and the cross point is closed or opened depending on the content of the instruction.

This drive system has no problems during normal operation, but problems arise in the event of a step failure of the output selection relay contact psr or a short-circuit failure between the printed wiring board and the mother turn.

Next, this problem will be explained with reference to FIG.゛Figure 2 shows the same drive circuit as Figure 1.1. All the symbols are the same as in FIG. In FIG. 2, the Nox selection relay contact psr inserted into the 5th drive line X7 of the drive coil section SWo
Assume that o has a stick problem. In this state, the drive coil section SW, (i = l~n,
In the example of FIG. 2, consider the case where the drive line X7 level (i=n) is driven by 1. In addition to the designated drive route ■ shown in Figure 2A, 1. If the path selection relay contact pSro of the ringing route ■ occurs due to a stick failure, the drive current will be divided into two routes, but the drive current will be divided into two routes, but the drive current will be divided into two routes. Since the drive current is constant, the drive routes ■ and ■ have the normal drive current A.
A current will flow.

Normally, the normality of the drive is checked on the driver side; however, on the driver side, the drive current is not shunted and is flowing normally. Therefore, by checking on the driver side, it is not possible to identify that the flow is divided into two routes. On the other hand, the switch itself cannot be expected to operate normally when the drive current reaches A. As a result, some parts of the network become uncontrollable, and abnormal conditions occur one after another in call processing, but since they cannot be detected by checking on the driver side, it is extremely difficult to understand the details of the failure and search for the failure location. becomes.

Such a failure occurs not only when the selection relay contact PSR sticks, but also when there is a short circuit between wiring or printed wiring board patterns. In order to solve these conventional problems, the present invention utilizes redundant contacts of the path selection relay contacts to prevent one drive current from being shunted. An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 3 is an operational explanatory diagram showing one embodiment of the switcher (IJ) and drive system of the present invention, in which the same functional parts as in FIG. 1 are given the same reference numerals. Note that the differences from Figure 1 are:
Mass selection relay contact psr is connected to drive coil section SWo~SW
return side, drive line XR.

This is the point that is also inserted on the YR side, and this relay contact p
The shunt current is blocked by sr.

In FIG. 3, as in FIG. 2, it is assumed that the stick selection relay contact psr Q of the drive line
=1~n1 Considering the case of driving the drive line stomach. Therefore, the drive current flows only through the designated drive route (2), and the drive is performed normally.

As described in more detail, the present invention makes it possible to prevent critical failures from occurring without increasing costs by utilizing surplus contacts of the selection relay contacts.
It has the effect of contributing to improving the quality of the system.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of a conventional general switch matrix and drive method, and FIG. 2 is an explanation of the operation in the event of a failure.FIG. 3 is an operation showing an example of the switch matrix drive method of the present invention. It is an explanatory diagram. 5Wo-8Wn...Switch matrix drive coil section, Xo-X7, Yo-Y7...Level selection side drive line, XR, YR...Return side drive line, psr 6
~pSrn... No. 9 selection relay contact. Patent applicant Oki Electric Industry Co., Ltd. Nippon Telegraph and Telephone Public Corporation NEC Corporation Hitachi Ltd. Fujitsu Ltd. No. 1 Figure 2 Figure 3 5-1 Marunouchi-chome, Chiyoda-ku, Tokyo ■Applicant Fujitsu Corporation 1015 Kamiodanaka, Nakahara-ku, Kawasaki City

Claims (1)

[Claims] In the switch drive circuit of an electronic exchange using a constant current drive type switch (IJ), in addition to the level selection side drive line of the switch drive circuit, the return side drive line is also connected to the /? A switch matrix drive system characterized by the insertion of relay contacts for switch selection.