Abstract: A control circuit of a power supply delivering a supply current to an inductor connected in series with the horizontal deflection yoke of a cathode ray tube display, the inductor being the primary coil of a transformer operatively connected for delivering a rectified low-pass filtered biasing voltage to the anode of the display, the low-pass filtering having a first time constant corresponding to the duration of a plurality of pictures, the control circuit having feedback circuitry for generating a monitoring voltage substantially proportional to the biasing voltage and for controlling the supply current to keep the monitoring voltage equal to a reference voltage; and feedforward circuitry for measuring the cathode current and for adding to the monitoring voltage a compensation voltage corresponding to the cathode current, low-pass filtered with a second time constant corresponding to the duration of a small number of lines and high-pass filtered with the first time constant.

Abstract: The invention concerns a scanning circuit, comprising a power supply providing a negative voltage on a first terininal (Tdown), an intermediate voltage on a second terminal (Gnd) and a positive voltage on a terminal of a switch (S), the other terminal of the switch being connected to a third terminal (Tup), a control circuit (6) supplied by connections to the second and third terminals, a differential amplifier receiving a positive and a negative input signal provided by the control circuit, a power amplifier controlled by the differential amplifier, both amplifiers being supplied by connections to the first and third terminals, a deflection coil (Ly) connected between the output of the power amplifier and the second terminal, biasing means setting, when the switch is open, the output of the differential amplifier so that the possible current paths through the power amplifier between the deflection coil and the first terminal are cut.

Abstract: The invention concerns a control circuit for an electron tube display comprising a deflection coil, the deflection coil being part of a scanning circuit and being coupled to a coil of a transformer powering a high voltage generator used to accelerate an electron beam, a phase locked loop being used to keep in phase the flyback pulses produced by the scanning circuit and the video signal synchronisation pulses, and comprising an electron beam current measuring circuit, a compensation circuit for compensating the phase difference between the flyback pulses and the video signal synchronisation pulses as a function of the measured current.

Abstract: A line scan circuit for a CRT, including, in series across a switch, two oscillating circuits having the same time constant, each including, in parallel, a capacitor, a diode connected in antiparallel, and a series association of an inductor and of a voltage source, the inductor of a first one of the oscillating circuits being a scan coil of the CRT; an amplifier receiving a set-point voltage and using, as a feedback, a voltage taken from one of the oscillating circuits, and providing an adjustable voltage source to the second oscillating circuit.

Abstract: A circuit for providing a rectified voltage to a flyback switch-mode supply circuit comprises a rectifying bridge having output terminals; a primary winding of the switch-mode supply having an intermediate tap; a switch serially connected with the primary winding; the serial connection between the output terminals, of a first diode and a capacitor, the first diode being biased so as to allow the charging of the capacitor; a second diode between a first output terminal of the winding, the second and third diodes being biased so as to let the current flow towards a second terminal of the winding.

Abstract: A multistandard rectified supply circuit comprises, across a full wave rectifying bridge, at least one storing element associated with a charge path comprising first unidirectional conductive elements of a first polarity and with a discharge path comprising second unidirectional conductive elements of a second polarity so that the storing means is differently charged and discharged. A switch cancels the effect of at least one of the first and second unidirectional elements so that the storing element is charged and discharged through a same path.

Abstract: The invention applies to packages for transmitting signals at very high frequencies. A package (10) for the integrated circuit (11) comprises conductors disposed on at least two levels (N1-N6) and distributed so that two pairs of conductors of two fixed potentials (18d, 18g; 19d, 19g), along with a conductor (18s) for single-pole transmission of a signal, form a three-dimensional structure which is approximately coaxial having a characteristic impedance which is substantially constant and predetermined.

Abstract: A method and apparatus for providing a rectified voltage to a flyback switch-mode supply circuit with power factor correction is disclosed and claimed. The invention comprises a rectifying bridge and a charge path for charging a capacitor from the rectified voltage obtained from the output of the bridge. The degree of power factor correction is achieved by selecting a time at which either the rectifying bridge output or the capacitor provides a voltage to the supply circuit. The input to the supply circuit is a primary winding having n1 turns between an upper and intermediate tap, and n2 turns between an intermediate and lower tap. The capacitor is connected to the upper tap via a diode, a first rectifying bridge output is connected to the intermediate tap via a diode, and a second rectifying bridge output is connected to the lower tap via a controllable switch.

Abstract: Active composite consisting of a compressed support and of at least one agent which is active towards a gas, the compressed support including recompressed expanded graphite which has a density of between 0.02 and 1.5. According to the invention the active composite is made up of a series of sheets superposed one above the other, the active agent being dispersed in the flakes.

Abstract: The present invention relates to a supply circuit having a storage capacitor, including, across a rectifying bridge, a storage capacitor associated with a charge path and with a discharge path, the charge path including a current limiter on a determined value and controllable according to the voltage across the rectifying bridge and to the voltage across the storage capacitor, whereby the storage capacitor charges with a substantially constant current during each of its charge phases.

Abstract: A signal transmission circuit for transmitting signals having a wide frequency spectrum over a cable. The circuit includes an isolating transformer having a high pass filtering function; a low-pass filter, the input of the low pass filter being common with the input of the high pass filter; and means for summing the output voltages of the low-pass filter and the high-pass filter.

Abstract: A multistandard rectified supply circuit comprises, across a full wave rectifying bridge, at least one storing element associated with a charge path comprising first unidirectional conductive elements of a first polarity and with a discharge path comprising second unidirectional conductive elements of a second polarity so that the storing means is differently charged and discharged. A switch cancels the effect of at least one of the first and second unidirectional elements so that the storing element is charged and discharged through a same path.

Abstract: A reactor for a chemical heat pump including a sealed container provided with a heating and cooling system and having an inside wall, and a solid reagent having an outer surface and disposed in the container, which solid reagent reacts reversibly with a reagent gas inside the container, the solid reagent having dimensions such that a space is defined between the outer surface of the solid reagent and the inside wall of the container. A fluid contact material occupies at least part of the space, the fluid contact material being a good conductor of heat and chemically inert relative to the solid reagent.

Abstract: A composite carbon/polymer electrode for a rechargeable electrochemical lithium cell comprises a powder of carbonaceous material and a coating polymer rendered ionically conductive by the addition of a lithium salt, and possibly carbon black or carbon fibers. The carbonaceous material has a proportion of volatile matter between 5 and 22 wt %, and is preferably a raw coke or a semi-coke.

Abstract: The subject of the present invention is an electrode based on carbonaceous material for rechargeable electrochemical lithium generators. The carbonaceous material is a pitch coke with a mosaic texture subjected to a pre-lithiation treatment before the production of the electrode. The carbonaceous material is preferably a coal tar pitch coke with a mosaic texture. The specific reversible capacities are greater than 400 mAh/g.

Abstract: A bipolar integrated circuit with N-type wells (2) formed in a P-type substrate (1) includes in first wells, first transistors (EBC), the well of which constitutes the collector. P-type base region (7a) is formed in the first well with an N+ emitter region (8) formed in the base region. In at least a second well forming a collector, a composite second transistor (E'B'C') is constituted by an elemental third transistor (E.sub.1 B.sub.1 C') comprising regions of the same doping level as the first transistor and an elemental fourth transistor (E.sub.2 B.sub.2 C') having a base region (11) with a high doping level with respect to that of the bases of the first transistor. Emitter regions (8b, 12) of the elemental transistors are of the same doping level as that of the first transistors. The emitters and bases of the third and fourth elementary transistors are interconnected and constitute the emitter and the base of the composite second transistor.

Abstract: An avalanche diode is formed in an N layer (20) of a bipolar integrated circuit. The diode comprises a first (P) region (22) and N region (21) disposed inside the first region. The portion of the first region which resides under the N region and close to the interface with the latter has a first doping level. A second (P) region (23) extends under the N region with a second doping level higher than the first close to the junction. A third P region (30) is disposed under the N region and overlaps the second P region. The third region has, at its interface with the N region, a doping level intermediate the first and second doping levels.

Abstract: An active composite consists of a compressed support and an agent which reacts with a gas. According to the invention, the compressed support comprises recompressed expanded graphite having a density between 0.02 and 1.5. A process for implementing gas-solid type reactions in which said active composite is used as the reaction medium is also described.

Abstract: A membrane support usable for separative procedures is disclosed. The support is a mechanically solid composite carbon-carbon material of limited thickness in the passage direction Z of a flow to be treated, which composite has a porous texture appropriate for the membrane, with a fibrous substrate and a porous carbon-containing matrix. To increase the permeability and reduce the roughness of the outer surface of the support to be brought into contact with the membrane, the fibrous substrate is a carbon fibre mat of carbon fibre segments contained in a plane perpendicular to the Z axis and randomly oriented in that plane. Optionally a fraction of the support to be in contact with the membrane contains an inert fine powder dispersion making it possible to adjust the diameter of the pores of the outer face of the support. Also disclosed is a process for the production of this membrane support and its use as a membrane support and as a filtering element without the addition of a membrane.

Abstract: A multi-layer material comprises at least two layers of flexible material, including one layer based on electrically conductive, expanded recompressed graphite and another layer based on a metal, wherein the layer of graphite has at least one face thereof covered at every point by a layer of metal and in direct electrical contact with the layer of metal, and wherein the layer of metal is obtained by electrodeposition or by chemical deposit of at least one metal on the layer of graphite in such a way that the layer of metal adheres directly to the layer of graphite and closely matches the micro-relief thereof.