Abstract: An angular reference position, VNO, of an oscillating shaft movable about this angular position is sensed. From N samples and from a stored value being a known angular reference position, an adjustment value is obtained and the stored known angular reference position is corrected as a function of the adjustment value.

Abstract: The produce comprises an electrically conductive tape cut out or etched so as to form windows from which connecting tabs for a chip project, according to the "single-layer" T.A.B. technology. An adhesive tape is glued to the conductive tape and pierced with windows centered on and lying within the conductive tape's windows. According to the invention, apertures isolate the connecting tabs for the purpose of applying test signals to the chip by means of the tabs then carried by the adhesive tape alone. The invention is used for testing integrated power circuits.

Abstract: The circuit according to the invention comprises a hysteresis comparator 9 connected to a transistor 2 controlling the current flowing in an inductive load 1. The voltage taken across the terminals of a measurement resistor 3 is compared with a reference voltage established by a source 6. According to the invention, a feedback loop 10 establishes a proportional action of the transistor 2 on the current in the load 1 when the voltage at S exceeds a predetermined threshold. In this way an oscillation is obtained between two values on either side of a nominal value, these two values being associated with the thresholds of the hysteresis comparator. Application to the production of an integrated circuit for the control of the ignition coil of an internal combustion engine.

Abstract: The circuit comprises a comparator 1 fed by a quasi-sinusoidal signal delivered by a source 2 for converting the positive alternations of the signal into pulses acceptable by digital computing means. According to the invention, the circuit comprises a current source 7 selectively connectible to the circuit in order to vary its sensitivity and to thus enable an evaluation of the amplitude of the signal delivered by the source 2. Application to the diagnosis of the operating state of a variable reluctance sensor delivering a quasi-sinusoidal signal representing the speed of rotation of a shaft fitted in a motor vehicle.

Abstract: An encoder delivers a pulse input signal in phase with equal angular steps of a rotary component, such as a toothed wheel driven by the crankshaft of an internal combustion engine. A missing tooth defines a reference position at which a synchronizing signal is also delivered. A counter is incremented by the pulse input signal and is reset by the synchronizing signal. A comparator compares the count in the counter with a number in a memory circuit to deliver a signal for triggering an event when the count in the counter coincides with the number in the memory circuit. The counter comprises a first counting circuit providing the least significant outputs of the counter and a second counting circuit providing the most significant outputs. The first counting circuit is reset by the input signal, and the second counting circuit by the synchronizing signal.

Abstract: This digital processing circuit or sequence includes means (10, 16) of sampling an analog signal and of converting the acquired samples into digital form, a shift register (25), means (23) of storing a value (N.sub..xi.) of an integration constant, a unit (30), an accumulator (31) and a sequencer (14) which controls the sampling and the conversion into digital form of the samples by the said means during a measuring period, the storage of the said digital value representing the last sample acquired in the shift register (25), the operation of the said unit (30) as an adder during the measuring period for the computation of a cumulative sum and, at the end of the said period, the operation of the unit (30) as a subtractor and the operations of rotation of the content of the accumulator (31) in order to divide the final result of the cumulative sum by the value (N.sub..xi.) of the integration constant.

Abstract: The housing protects a circuit comprising active power components 10, 11, 12. A power electrode of the component 10 is welded onto the flush surface 15 of a radiator 13 accommodated in the base of the housing. The radiator is formed in one piece with an elongate part 14, the end 5 of which projects from the housing in the form of an external connecting pin. The radiator 13 may take various forms, including that of a grid.

Abstract: The invention is in the field of electromagnetic transducers. The sensor according to the invention includes an electrical winding 2 mounted on a carcass 1 hollowed with a cavity 7 which receives a metal pole piece 5 and a permanent magnet 6. According to the invention inclined ribs 20 are formed in the cavity 7 in order to constitute a means of progressively locking the magnet by the wedge effect during the insertion of this magnet and of the pole piece into the cavity. It is thus possible to accurately adjust the distance d which separates the end 21 of the pole piece from a reference surface 22 of the carcass 1. Application to the production of a shaft speed sensor or a wheel speed sensor for a motor vehicle.

Abstract: The invention belongs to the field of dimensional metrology. The process according to the invention makes use of a hot wire sensor (1) passing through the free surface of the liquid. The wire is heated by a joule effect up to a temperature To. The supply to the wire is then interrupted for a predetermined time interval .tau.. The current passing through the wire at the two instants forming the bounds of this interval is determined by means of an A/D converter (3) which feeds a control and computing unit (4). From these current measurements this unit derives a value which represents the liquid level.

Abstract: The invention relates to the transmission of logic signals.The circuit comprises a port D connected to a line for the transmission of unipolar logic signals and a port (D+, D-) connected to a pair of wires for the transmission of differential logic signals. Current generators (T4, T5) send a positive differential signal when a unipolar "low" logic signal is applied to port D. When the differential signal received at (D+, D-) must be transmitted on the D port by a "low" level, the signal representing the low level remains higher than the voltage level V.sub.L1 below which the voltage generators are activated, in order to prevent any blockage of the circuit by looping of the signals within the circuit.Application to the multiplexing of the flow of data processed in an automobile vehicle.

Abstract: The present device for limiting the running speed is associated with an electronic ignition device comprising at least one energy storage member (21) which is normally charged so as to store at least a nominal quantity of energy, means (22, 23) for applying the said energy to an ignition coponent and electronic means (14, 25, 26) for generating the charging time of the energy storage member.

Abstract: The process and the device enable the electrical powering of a circuit having a conductor (1) with high thermal inertia by means of a transistor (3) with low thermal inertia. According to the invention, the device comprises a current limiter circuit (4,5,7,11), a voltage detector circuit (8) and a control microprocessor (6) which, according to a pre-established program, controls the flowing and stoppage of current in the power transistor (3) controlling the powering of the conductor (1) with high thermal inertia.Application to the control of lights in automobile vehicles.

Abstract: This interface enables the integrated circuit with which it is associated to be placed in a test configuration by applying to its test input terminal (2) a voltage higher than the power supply voltage (V.sub.cc) of the circuitry. In the rest state, the interface then supplies a low logic level to its output terminal (5). If the test command voltage is applied, this level changes state.The interface comprises, in particular, two transistors (M.sub.1, M.sub.2) of opposite types of conductivity which are fed by a constant current source (10, M.sub.5, M.sub.6). The interface switches over when the input transistor (M.sub.1) is put into the conducting state by the test command voltage so as to divert a fraction of the current flowing in the second transistor (M.sub.2).The input terminal (2) can at the same time be a functional input terminal of the integrated circuit.

Abstract: Housing (14) for an electrical device (10), comprising a first cavity (16) inside which the functional part of (12) of the system is arranged, and a second cavity (18) for performing an electrical connection, which is separated from the first cavity by a leak-tight wall (20) through which a metal lug (22) for making an electrical connection passes, a first end (36) of the said lug, which is situated inside the first cavity (16), ensuring an electrical connection wth the functional part of the system and the second end (26) of the said lug, which is situated inside the second connection cavity (18), being provided with means (28) for ensuring electrical connection (10) with an electrical wire (30).

Abstract: This device comprises, at a first end (1) of the line, at least one controlled voltage source (SV2) and a current receiver (RI2) capable of detecting the current (I) flowing in the line (L) and, at the second end (3) of the line, at least one controlled current source (SI2) and a voltage receiver (RV2) capable of detecting the voltage (V) present on the line, the controlled current source (SI2) being adapted to impose the flowing in the line (L) of a programmable current (I) that is independent of the voltage receiver (RV2), of the voltage source SV2) and of the current receiver (RI2), while the controlled voltage source (SV2) is adapted to impose on the line (L) a programmable voltage (V) that is independent of the current source (SI2), of the current receiver (RI2) and of the voltage receiver (RV2).Application to electronic ignition systems for internal combustion engines.

Abstract: The invention relates to a device for the acquisition and the processing of N asynchronous and periodic signals, such as velocity signals, N being preferably between 1 and 8, including a set of N synchronization flip-flops (B1) followed by a set of N storage flip-flops (B2) whose output is applied to a dedicated circuit via an N-input AND gate type assembly, the N synchronization flip-flops being sample by a flip-flop system (B4) from the clock of the dedicated circuit and the N automatic flip-flops (B1) being reset from said clock by an automatic flip-flop (B3).

Abstract: This system includes hysteresis comparison means (6, 9) whose output goes from a first state to a second state when the voltage of the ignition signal (S.sub.A) passes a predetermined high threshold and returns from the second state to the first state when the voltage of the ignition signal drops below a predetermined low threshold, a flip-flop circuit (8) triggered by the means of comparison (6, 9), and whose output delivers the said synchronous signal (S.sub.S), and a duration discriminator circuit (7) which only authorizes the switching over the flip-flop circuit (8) in response to the change in the output of the comparison means (6, 9) from the second state to the first state when the said output remains in the first state for a duration at least equal to a predetermined value. This invention may be used for measurement of the speed of an internal combustion engine.

Abstract: The invention relates to a multiple fastening clip (21) and its application to a device for the collective mounting of electronic power components (3) on a heat sink (15). This mounting device comprises a heat sink (15) in the form of an angle section perforated with apertures (18), a dielectric plate (20) interposed between said heat sink (15) and said components (13), and a thermally conductive multiple clip (21) provided with projections intended for cooperating with said apertures (18) in order to secure the clip.