Electrical transmission or interconnection systems – Switching systems – Condition responsive
Patent
1992-06-22
1994-06-14
Pellinen, A. D.
Electrical transmission or interconnection systems
Switching systems
Condition responsive
34082579, H04Q 130
Patent
active
053213122
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a switching device for an on-off switching of on electrical current operable units, in particular units connectable on the mains, comprising a first series of switches connected with a branching member which is further connected with first inputs of a second series of switches, each having a first input on which said units are connectable and a second input on which a supply source, in particular the mains, is connectable.
Such switching devices are generally applied in domestical houses or industrial plants. The units operable on electrical current are for example formed by lighting points, domestical apparatuses, machines and computers. The first series of switches are arranged either on different places or on a same place in the building, depending of the type and the destination of the building and have the purpose to control said units, in particular to switch them on and off. The switches of the first series are connected with a branching member, for example formed by a branching box or a switchboard, from which current or control signals are transmitted towards a second series of switches. This second series of switches are for example formed by relais or teleruptors which then take care that the necessary current and voltage is supplied to the units in order to provide them with the necessary electrical power.
A drawback of the known device is that, when it is necessary to control by means of a plurality of first switches a same or different units, the installation of a rather larger number of electrical wires is required which is a cumbersome activity. Moreover such a device is barely flexible and often implies for each modification the appliance of additional wires.
The object of the invention is to provide a solution for said drawbacks.
A switching device according to the invention is characterized in that said second inputs of said first series of switches are connectable on a low tension supply source and each switch of said first series is connected with at least one address generator provided for assigning an address to said switch connected thereto and corresponding with a further address assigned to the unit controlled by said switch connected thereto, which branching member is connected to a bus provided with a predetermined number (n) of transmission lines for communication between said address generator and said branching member and comprising a control signal generator connected with r (2.gtoreq.r<n) of said n transmission lines which are further connected with a control input of said address generators, which address generators comprise a second output connected via the n-r remaining transmission lines with the branching member and which are provided for transmitting towards said branching member a t.sup.th (1.ltoreq.t<2.sup.(r-1) partial address under control of each time a t.sup.th control signal generated by said control signal generator, said t.sup.th partial address being each time formed of a t.sup.th part of the address generated by the address generator. By assigning an address to each switch of the first series and by further transporting the address over a bus with a predetermined number of transmission lines there is obtained, on the one hand, a reduced number of wires between the first switches and the branching member and, on the other hand, a very flexible device whereby a modification to be applied can easily be realized by assigning another address. By further using 2.sup.r-1 control signals the addressing capabilities can be enlarged without requiring additional wires.
A first preferred embodiment of a switching device according to the invention is characterized in that the number r of transmission lines equals two. Due to this, the number of address possibilities is enlarged by using a simple two-bits control signal.
A second preferred embodiment of a switching device according to the invention is characterized in that said second series of switches are disposed according to a matrix and there is assigned to each switch of said second s
REFERENCES:
patent: 3562418 (1971-02-01), Glusick
patent: 4539564 (1985-09-01), Smithson
patent: 4630045 (1986-12-01), Georgiou
Ganjoo Peter
Pellinen A. D.
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