Thales

Safran Electrical & Power

Zodiac Aero Electric

Francis Abdesselam

Frédéric Lacaux

Joël Devautour

Mathieu Mairie

Rémy Biaujaud

Prithu Mariadassou

A power stage includes a control device and a power transistor, the control device comprising a primary circuit comprising: a control module able to generate a control current, a primary circuit malfunction detector able to detect a malfunction, a pulse transformer comprising a primary winding connected to the primary circuit, comprising a secondary winding connected to the secondary circuit, magnetically coupled to the primary winding and able to generate, from the control current, an induced pulse current making it possible to drive the power transistor, a secondary circuit comprising: a power and fault detection controller able to detect a malfunction of the secondary circuit or of the power transistor, the power and fault detection controller being able to communicate the malfunction of the secondary circuit or of the power transistor to the primary circuit malfunction detector.

High-immunity, self-protected and bidirectional isolated controller without any complex component

A power stage includes a power transistor controlled via a driver, the power transistor comprising three terminals, including a collector c, an emitter e and a gate g linked to the driver, the power stage comprising a detection device for detecting a short-circuit current cc between the collector c and the emitter e, the detection device comprising a voltage sensor capable of detecting a voltage Vge at the gate g of the power transistor outside of a predefined voltage range.

Short circuit detection and protection for an insulated gate component by monitoring and checking the gate voltage

A power stage includes a power transistor and a driver, the power transistor comprising a collector, a gate and an emitter and being configured to change over from a saturated state to an off state and vice versa in accordance with a control from the driver, the power stage comprising a resistor Rg positioned between the driver and the gate, the power stage comprising a circuit for compensating for delays that is positioned in parallel with the resistor Rg, comprising: a circuit for compensating for turn-on initialization delays, which is configured to divert the current from the resistor Rg when a saturation of the power transistor is initialized, a circuit for compensating for turn-off initialization delays, which is configured to divert the current from the resistor Rg when a switching-off of the power transistor is initialized, a circuit for compensating for delays that is configured to divert the current from the resistor Rg when the power transistor is close to the saturated state.

Driver for insulated gate transistor with circuit for compensating for time delays

A cooling structure intended to cool a rotating electrical machine (ME). The cooling structure includes a solid metal body (CM) having an overall tubular form delimited radially by a first contact surface, intended to completely radially surround the electrical machine and to be in physical contact with the electrical machine, and by a second contact surface completely radially surrounding the first contact surface and intended to be in physical contact with a first power module of the set of at least one power module so as to be able to cool the electrical machine and the power module, the cooling structure comprising a set of at least one cooling channel (CR, CR, CR, CR) formed in the solid metal body (CM), at a distance from the first contact surface and from the second contact surface, wherein a coolant is intended to circulate.

Cooling device and speed change drive unit

A measurement device configured to deliver a voltage corresponding to an overlay of an input voltage applied to the terminals of the measurement device and of an image voltage of a current circulating in a first capacitor to the terminals of which the input voltage is applied, the measurement device includes a shunt filter intended to be mounted in parallel with the first capacitor and comprising a second capacitor and a first resistor mounted in series with the second capacitor, a second resistor mounted in parallel with the second capacitor.

Voltage measurement device and inverter device comprising such a voltage measurement device

An inverter device intended to convert a DC voltage into three phases of a polyphase AC voltage with a predetermined frequency, the inverter device comprising three single-phase inverters, each of the three single-phase inverters being able to deliver one of the three phases.

Inverter device

An emulating device for emulating a bimetallic strip, the emulating device comprising a current sensor capable of measuring a line current (I) flowing through the emulating device, the emulating device being capable of providing a value representative of a cumulative thermal state over time t, which value is referred to as cumulative thermal state, by recursively adding a value representative of an initial thermal state, which value is referred to as initial thermal state, and a value representative of a present thermal state, which value is referred to as present thermal state, which is determined on the basis of the line current (I).

Device for emulating a bimetallic strip, and device for protecting an electrical line from over-currents

An AC-AC matrix converter that converts an input multiphase periodic voltage includes N input voltages that are out of phase into an output multiphase periodic voltage comprising N output voltages that are out of phase, the converter comprising a square matrix array comprising Nswitches. The converter comprises command and control electronics that periodically perform the following two functions: storing N! voltage summations, each voltage summation corresponding to one switch configuration, each switch configuration relating one and only one out-of-phase input voltage and one and only one out-of-phase reference voltage, each voltage summation being the summation of the N differences in absolute value between one and only one out-of-phase input voltage and one and only one out-of-phase reference voltage; switching the matrix array of switches to apply the configuration corresponding to the lowest voltage summation.

AC-AC converter comprising a matrix array of bidirectional switches of programmable configuration

An electrical transformer includes a first winding, called primary, at least one second winding, called secondary, switches, and a current detection system, wherein it comprises at least one metal screen having a connection point linked to a neutral potential of the primary winding or intended to be linked to an electrical ground and placed between the primary winding and the at least one secondary winding, the screen being made of an electrically conductive material having a melting point higher than that of the materials constituting the windings; in that the primary winding comprises an input intended to be linked to an external energy source, the switches are placed at the input of the primary winding so as to be able to isolate the primary winding from the external energy source and in that the current detection system is configured to detect a current at the input of the primary winding or a current at the connection point and to close or open the switches based on the detection of the current, the detection system being differential or thermal.

System for detecting and limiting the effects of loss of insulation of an electrical transformer

The monitoring of an electrical equipment item includes two electrically insulated circuits, a screen in the form of a film arranged between the two circuits, the screen comprising a substrate and a conductive filament arranged on the substrate, a module configured to circulate a current in the conductive filament and to monitor the current.

Growing community of inventors

Chatou, France

Francis Abdesselam