Patent GB-832854-A (GB)
Title: Improvements in or relating to coincidence-testing arrangements
IPC: G06F11/08
Filed: 1957-10-31
Abstract: 832,854. Automatic exchange systems. SIEMENS & HALSKE A.G. Oct. 31, 1957 [Oct. 31, 1956], No. 34058/57. Class 40 (4). [Also in Group XL (c)] In an arrangement for detecting the simultaneous presence of two or more voltages from a plurality of voltage sources, each voltage source is allotted to a group in each of a plurality of series of groups in such a way that any two sources, which are in the same group in one of the series, are in different groups in at least one other series, a voltage in any group marking a group terminal, and each series is provided with means for detecting the simultaneous marking of two or more of its groups. Simultaneous operation of two of a plurality of relays may be detected by grouping the relays in a similar manner. The arrangements may be used for fault indication in a telephone system in which only one of a plurality of such sources or relays should be energized at any one time. In one embodiment, Fig. 2, the twelve voltage sources Q11 ... Q43 are arranged in a 4 X 3 array, the horizontal rows forming one series of three groups and the vertical columns forming another series of four groups. Sources of each row are connected respectively via decoupling rectifiers to respective group terminals Y1 . . . Y3 of one series which terminals are connected in pairs by three " and " gates so that simultaneous outputs on any two group terminals produces an output on terminal Y. Likewise the sources are connected to group terminals X1 ... X4 of the other series, each pair of which is associated with one of six " and " gates which operate so that potentials on any pair of these terminals produces an output at X. Clearly coincident voltages from any of the sources Q13 ... Q41 must produce an output from at least one of terminals X, Y. If the number of sources is very large, so that the number of group terminals is also large, these terminals may themselves be treated in the same manner as the original sources and arranged in co-ordinate arrays for further grouping, Fig. 4 (not shown). In a further arrangement, Fig. 3 (not shown), 48 sources are arranged in a 4 x 4 x 3 three-dimensional array, there being three series of groups, the groups of any particular series lying in parallel planes. In an embodiment for detecting the simultaneous operation of more than one out of 1000 relays, the relays are arranged in a 10 x 10 x 10 array, Fig. 6. Each relay has three contacts. Contacts in any plane being parallel-connected. Thus, as shown, contacts of relays 1 ... 100 are parallel-connected and associated with coincidence detection circuit KXY. Similarly, all similar groups of 100 in planes perpendicular to the Z axis feed the circuit KXY. Division into planes perpendicular to the X and Y axes forms two further series of groups which feed detection circuits KYZ and KZX respectively. Fig. 7 illustrates the detailed method of connection. Each detection circuit consists of two transformers, the primary of the left-hand transformer being fed with A.C. and the secondary of the left-hand transformer and the primary of the right-hand transformer having ten equally spaced taps. Corresponding taps are connected via the paralleled groups of contacts corresponding to the planes, so that if relays belonging to two groups in any one series operates, A.C. reaches the secondary of the right-hand transformer and hence (after rectification) the output terminal S. Owing to the matching of the turns-ratio by this method, the magnitude of the output signal is independent of the groups to which the relays belong.