Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

Cefem Industries

Dominique Bergogne

Pierre Perichon

Léo Sterna

Alain Bailly

Guillaume Regis

Thanh-Hai Phung

Frédéric Rothan

Jérôme Fangier

Lionel Fangier

Redouane Hammal

The present invention concerns an electronic device comprising: a first switch (T) having a single voltage blocking direction; a second switch (T) electrically in series with the first switch between two nodes () of application of a DC voltage; and a module configured to supply the second switch with a control signal, referenced to the potential (COM) of a midpoint () between the two switches.

Power converter comprising at least two switches and a module for supplying control signals thereto

A device for detecting the polarity of a current or voltage, the detection device including a circuit portion with a detection node configured to produce at the detection node a measurement voltage which is an image of a fraction of the detected current or voltage, and a detection circuit with transistor(s), coupled to the detection node, and provided with amplifier(s), with a comparator transistor having a source gate voltage which depends on the measurement voltage. The comparator transistor further includes a source set at a first fixed potential and a source-gate voltage which depends on the measurement voltage or a gate set at a second fixed potential and a source-gate voltage which depends on the measurement voltage, the detection circuit being configured to compare the measurement potential with a threshold and to output a binary detection signal indicating the polarity of the detected current or voltage.

Detector for detecting the polarity of an alternating signal

The present description concerns a circuit () for monitoring the operation of a component () associated with equipment (), comprising: at least one device () for measuring one or a plurality of physical quantities associated with the operation of the component; and a circuit for calculating a value representative of a remaining lifetime of a component, said monitoring circuit () being linked to the equipment.

Monitoring aging of a component

The present description concerns a device for delivering a voltage from an AC voltage, comprising a capacitive element (), two switches (H,L) in a half-bridge between terminals of the capacitive element (); terminals () of application of the AC voltage; a transformer (), comprising a first winding () coupling to a junction node () between the switches (H,L) one of the terminals () of application of the AC voltage; and one or a plurality of circuits (), configured to switch the switches (H,L) and receive an AC current (I) flowing through a second winding () of the transformer () and regulate the voltage delivered by the device by acting on a frequency of said AC current and/or on a phase shift of said AC current with respect to its reception.

Device for supplying power from an AC voltage

The present disclosure concerns a device including a first switch, a diode, and a passive resistive element electrically in series between conduction and control terminals of the first switch, a terminal of the diode located on the side of the first switch being coupled to a node of application of a potential variable with respect to the potential of said conduction terminal.

Driver circuit for controlling a switch and circuits comprising same

The present description concerns a method of controlling at least one switch (TH), including: the reception of signals (S-i) having between one another at least one phase shift representative of a desired state of said at least one switch; the obtaining, from said signals, of a value (Si) representative of the desired state; and the application of the representative value to said at least one switch.

Switch control device

The present description concerns a method of controlling a bidirectional switch (), including: first () and () field-effect transistors electrically in series between first () and second () terminals of the bidirectional switch; third () and fourth () field-effect transistors electrically in series between said first and second terminals of the bidirectional switch, a first connection node () in series with the first and second transistors being common with a second connection node () in series with the third and fourth transistors, including steps of: receiving a voltage (V) between the terminals of the bidirectional switch; detecting, from the received voltage, a first sign of said voltage; at least while the first sign is being detected, coupling the first terminal to said first node (), potentials of control terminals of the first, second, third, and fourth transistors being referenced to the potential (REF) of the first and second nodes having common sources of the first, second, third, and fourth transistors connected thereto.

Bidirectional switch control

A power converter comprises a primary stage including four switches forming a first H bridge; a control circuit capable of applying a first control signal to the first H bridge; a secondary stage including four switches forming a second H bridge; a control circuit capable of applying a second control signal to the second H bridge; and a power transmission stage coupling the primary stage to the secondary stage, wherein the control circuit of the secondary stage is electrically isolated from the control circuit of the primary stage. During a measurement period of a synchronization phase, the switches of the secondary stage are maintained in a short-circuit configuration while the switches of the primary stage are controlled in switched mode.

Phase-controlled power converter

The instant disclosure concerns a power converter including: a primary stage () including at least one first cut-off switch (S, S, S, S); a control circuit () capable of applying a first control signal to said at least ore first switch; a secondary stage () including at least one second cut-off switch (S, S, S, S); a control circuit () capable of applying a second control signal to said at least one second switch; a power transmission stage () coupling the primary stage () to the secondary stage (), wherein the control circuit () of the secondary stage is electrically isolated from the control circuit () of the primary stage.

Power converter

A DC voltage step-down converter, includes at least one first resistive element in series with a first switch between a first terminal and a second terminal of application of a first DC voltage; and a capacitive element between a third terminal and a fourth terminal for supplying a second DC voltage smaller than the first one, the node between said first resistive element and the first switch being coupled by a diode to said third terminal, said first switch being turned on when the second voltage is greater than a reference voltage of the second voltage.

Voltage step-down converter

The present invention concerns a circuit for converting a first control signal referenced to a first potential into a second signal referenced to a second variable potential, including: a first transistor between a first terminal for supplying said second signal and a second terminal at said second variable potential; and at least one first branch including, in series between a gate of the first transistor and a third terminal at said first potential, a second transistor, a first resistive element, and a third transistor, a gate of the third transistor being intended to receive the first signal and a gate of the second transistor being coupled to the second terminal, the gate of the second transistor being further coupled, by a first clipping element, to its source.

Power transistor control circuit

A DC/DC converter comprises a transformer having a primary and a secondary, a winding of the primary forming part of a transformer power supply self-oscillating circuit. The primary side includes a controllable circuit that receives a first digital signal to be transmitted to the secondary, and a modulation device acting on the self-oscillating circuit. The secondary side comprises a detection and de-modulation circuit for recovering the first signal. The modulation device delivers a second signal that controls, via a switch, application of a first DC voltage across the self-oscillating circuit when the second signal is in a first state, the second signal comprising first pulse trains in a second state during first periods of the first signal. The detection and demodulation circuit comprises a device for reconstructing the first pulse trains of the second signal based on interruptions of energy recovered at the secondary, thereby deducing the first signal therefrom.

DC/DC converter comprising a transformer and transmission and recovery of a signal thereacross

A device for controlling a first control gate transistor, including: a second transistor and a third transistor series-connected between a first and a second terminals of application of a power supply voltage, the junction point of these transistors being connected to the gate of the first transistor; a terminal of application of a digital control signal; a circuit for generating an analog signal according to variations of the power supply voltage; and for each of the second and third transistors, a circuit of selection of a control signal of the first transistor representative of said digital signal or of said analog signal.

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Grenoble, France

Dominique Bergogne