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Jerome Saby

Yves Theoduloz

Cyril Marti

Arnaud Casagrande

Thierry Scordilis

Luca De Rosa

Mario Dellea

Thomas Coulot

Mathieu Coustans

Matteo Contaldo

Maeve Petit

The system () is provided for managing at least one sub-assembly () of an electric battery. Each sub-assembly comprises a plurality of power storage cells (). The system includes, for each power storage cell, a circuit () for managing the state of the cell and a communication circuit (), which is configured such that it receives and transmits data relative to the cell. The communication circuit is configured such that it transposes, over a carrier frequency, the data to be received and transmitted, the value of said carrier frequency being greater than or equal to 1 GHz. The management system further includes, for each sub-assembly, a loss cable () connecting the power storage cells of said sub-assembly. The loss cable acts as a waveguide and is coupled by capacitive coupling to the communication circuit of each power storage cell.

System for managing at least one sub-assembly of an electric battery

A method and device for transmitting () to an electrical element () the power of a radio frequency type signal received by a radio frequency receiver (), e.g., a radio frequency identification (RFID) chip, the receiver () having a receiving antenna () and a voltage rectifier () of the signal received by the antenna (), the transmission device () including a voltage converter () connected to the rectifier () of the chip and to the electrical element (). The device includes a control system () configured to momentarily derive the signal from the rectifier () in order to define an optimal input voltage of the converter () for which the input impedance of the converter corresponds to the output impedance of the rectifier (), and to redirect the DC signal to the voltage converter () by providing the converter with an input voltage setpoint corresponding to the optimal voltage.

Method and system for transmitting the power of a radio frequency type signal received by a radio frequency receiver

The invention relates to a DC-DC converter () for a power source () generating extremely low voltage, the converter () operating in discontinuous mode, wherein the converter () comprises a self-oscillating charge pump () having an array of interconnected ring oscillators (RO-RON) for successively stepping up an input voltage (Vin) so as to result in the accumulated voltage (XN) at the last ring oscillator (RON), an amplifier () and a pulse signal generator () that generates a pulse signal that actuates a switch () so that the stepped-up, output voltage may be provided via a diode (). The invention further relates to a method for actuating the DC-DC converter () for a power source () generating extremely low voltage.

DC-DC converter for a low voltage power source

A power management integrated circuit including a reference signal generator, a start-up unit and a supervisory circuit. The supervisory circuit includes an electrical resistance circuit connected between a first end node and a second end node; a power supply input for receiving a supply voltage, this power supply input being connected to the first end node; a low reference potential node; a comparator for comparing a reference voltage value at a first input and a divided voltage value at a second input connected to an internal electrical node of the electrical resistance circuit, the comparator can output a monitoring signal. The supervisory circuit includes a switch controlled by the start-up unit so that the switch is selectively closed and opened based on a detected operational state of the reference signal generator indicating a normal functioning phase of the power management circuit.

Power management integrated circuit including a supervisory circuit that controls a switch arranged between a node of an electrical resistance circuit and a reference potential node

The measuring device determines the luminous intensity received by a photovoltaic cell electrically connected at output to an electrical energy storage unit via a DC-DC converter and to an external capacitor arranged in parallel to the DC-DC converter. It includes:

System comprising a photovoltaic cell and a luminous intensity measuring device and method for measuring luminous intensity received by the photovoltaic cell

A DC-DC converter () with low start-up power and voltage includes an inductor () connected to an input voltage source (), a switch () connected to the inductor and controlled by a controller () and a diode () connected to a connection node of the inductor and the switch to provide an output voltage (Vout). The controller includes an oscillator and a monostable element, which are powered by the input voltage (Vin). The oscillator provides an oscillation signal (OSC) having a period T of a switching cycle of the switch. The monostable element () is controlled by the oscillation signal to determine a duration Tn of conduction of the switch, during which an increasing current (IL) flows through the inductor. The input impedance of the DC-DC converter increases, when the input voltage (Vin) drops below a first voltage threshold with a decreasing duty cycle d=Tn/T.

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Colombier, Switzerland

Jerome Saby