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US 4,059,774 AGranted
Switching inverter with thermoconductive materials
AssigneeThomson-CSF
InventorOlivier Cahen
Life of this patent
Estimating the term…
Abstract
A switching point, for telephone switching, and a matrix are provided. They use thermoconductor materials i.e. materials capable of a sudden change in conductivity at a certain temperature, as V O.sub.2. The basic switching point comprises a resistive layer with a significant Joule effect, an insulating layer and a layer of V O.sub.2, deposited one on top of the other on the same substrate, using thin layer technology. Two elements connected in series enable a logic inverter to be formed. Three thermoconductive elements enable a telephone wire switching point to be formed between two conductors with a middle point connected to earth.
Claims6
An inverter logic circuit comprising:
- an input terminal;
- an output terminal;
- a first source terminal;
- a second source terminal;
- means for respectively connecting the first and second source terminals to a first and a second pole of a d.c. source;
- a first switching element, consisting of a first substrate, and, successively deposited on said substrate, a first layer that is electrically resistant and insulated from said substrate, said layer having one end connected to said first source terminal and an other end connected to said input terminal;
- a second electrically insulating and thermally conductive layer;
- and a third layer consisting of a thermoconductive material having one end connected to said first source terminal and another end connected to said output terminal;
- a second switching element consisting of a second substrate, and, successively deposited on said substrate, a fourth layer that is electrically resistant and insulated from said substrate, said fourth layer having one end connected to said second source terminal, and another end connected to said input terminal;
- a fifth electrically insulating and thermally conductive layer;
- and a sixth layer consisting of a thermoconductive material having one end connected to said second source terminal and another end connected to said output terminal;
- said input terminal adapted to be put alternately at the potential of one or the other of said poles, so as to cause the resistant layer to heat the thermoconductive layer, in order to have the potential of one or the other pole appear at said output terminal.
9 more elements
A single switching point circuit for connecting a first conductor to a second conductor, said switching point circuit comprising:
- a first conductor terminal;
- a second conductor terminal;
- a first source terminal;
- a second source terminal;
- means for respectively connecting the first and second source terminals to the opposite poles of a d.c. source;
- a control terminal;
- a ground terminal;
- a first switching element including a substrate, a first two-terminal resistant layer and a first two-terminal thermoconductive layer thermally coupled to one another;
- a second switching element including, on a substrate, a second two-terminal resistant layer and a second two-terminal thermoconductive layer thermally coupled to one another;
- and
- a third switching element including, on a substrate, a third two-terminal resistant layer and a third two-terminal thermoconductive layer thermally coupled to one another;
- said first and second thermoconductive layers being connected in series between said first and second conductor terminals, with a middle point connected to said ground terminal through said thermoconductive layer and directly to said control terminal;
- and said first and second resistant layers being connected in parallel between said first and second source terminals through said third resistant layer.
10 more elements
An adapted switching point circuit for connecting a first conductor to a second conductor of a line, said switching point circuit comprising:
- a first conductor terminal;
- a second conductor terminal;
- a first source terminal;
- a second source terminal;
- means for respectively connecting the first and second source terminals to the opposite poles of a d.c. source;
- a first resistor;
- a second resistor, the value of said first and second resistors respectively equal to the characteristic impedance of said line;
- a control terminal;
- a ground terminal;
- a first switching element including on a substrate a first two-terminal resistant layer and a first two-terminal thermoconductive layer thermally coupled to said resistant layer;
- a second switching element including on a substrate a second two-terminal resistant layer and a second two-terminal thermoconductive layer thermally coupled to said resistant layer;
- a third switching element including on a substrate a third two-terminal resistant layer and a third two-terminal thermoconductive layer thermally coupled to said resistant layer;
- a fourth switching element including on a substrate a fourth two-terminal resistant layer and a fourth two-terminal thermoconductive layer thermally coupled to said resistant layer;
- a fifth switching element including on a substrate fifth two-terminal resistant layer and a fifth two-terminal thermoconductive layer thermally coupled to said resistant layer;
- said first and second thermoconductive layers being connected in series between said first and second conductor terminals, with a middle point connected to said ground terminal through said third thermoconductive layer and directly to said control terminal;
- said first and second resistant layers being connected in parallel between said first and second terminals through said third resistant layer;
- said fourth thermoconductive layer being connected between said first conductor terminal and said ground terminal through said first resistor;
- said fifth thermoconductive layer being connected between said second conductor terminal and said ground terminal through said second resistor;
- and
- said fourth and fifth resistant layers being connected in parallel with said third resistant layer.
17 more elements
Dependencies are inferred from the claim text.