Synchronous switch

Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons

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307252VA, H03K 1772

Patent

active

039926389

ABSTRACT:
A synchronous switch for alternating circuits or rectified alternating circuits, the operation of which is automatically synchronized on the passage to zero of the load voltage at its terminals. This synchronous switch contains essentially a semi-conductor element selected from thyristors of a particular type and possibly a diode. The semiconductor element comprises two main electrodes and a control electrode. This element can only be triggered at times when the polarity of the control voltage at the gate is the reverse of that of the first main electrode, and once triggered it then remains closed until the load current crossing it is reduced to zero. The main electrodes may be connected to a rectifier bridge to provide an alternating current switch. The main electrodes may also be connected across a diode, and the devices thus formed can be used to interrupt each phase of a polyphase load current.
These synchronous switches are used for the synchonized interruption of load circuits irrespective of the nature of the load (resistive or reactive) or for the control of main switches.

REFERENCES:
patent: 3196330 (1965-07-01), Moyson
patent: 3257566 (1966-06-01), White
patent: 3328606 (1967-06-01), Pinckaers
patent: 3335291 (1967-08-01), Gutzwiller
patent: 3392284 (1968-07-01), Cain
patent: 3450891 (1969-06-01), Riley
patent: 3577010 (1971-05-01), Freyling, Jr. et al.
patent: 3636379 (1972-01-01), Moe et al.
patent: 3648074 (1972-03-01), Nurnberg
patent: 3668422 (1972-06-01), Pascente
patent: 3723769 (1973-03-01), Collins
patent: 3764832 (1973-10-01), Stettner

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