Switching matrix equipment having a series circuit of relay coil

Details Switching matrix equipment having a series circuit of relay coil Switching matrix equipment having a series circuit of relay coil

1979-02-22

1980-10-28

Yusko, Donald J.

Communications: electrical

Digital comparator systems

179 18GE, H04Q 900

Patent

active

042310172

ABSTRACT:
A switching matrix equipment is disclosed for use in a telecommunication switching system. Each crosspoint comprises a series circuit of a relay coil and a self-holding diode. First and second switch groups cooperate to select a crosspoint and to fire a self-holding diode of the cross point. After the self-holding diode is fired, the crosspoint related is held or sustained by means of a third switch group with a lower voltage than the threshold voltage of the self-holding diode.

REFERENCES:
patent: 3349186 (1967-10-01), Bereznak
patent: 3532976 (1970-10-01), Adelaar et al.
Philips Telecommunication Review, vol. 27, No. 3, May 1968, pp. 105-112.
Electrical Communication, vol. 42, No. 1, 1967, pp. 33-39.
Ericsson Review, No. 2, 1976, pp. 75-81.

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