Abstract: A one-way dipolar component with overcurrent protection including, in parallel, a first one-way dipolar component with a positive temperature coefficient; and a second one-way dipolar component having the same biasing as the first one-way dipolar component having a conduction threshold voltage greater than the conduction threshold voltage at ambient temperature of the first one-way dipolar component, the second component comprising a silicon diode in series with a component of a zener diode type.

Abstract: A switched-mode power converter, including, between a first end of a main inductive element and a switch, a two-value inductive element automatically switching between its two values.

Abstract: A circuit for controlling a switch to be controlled in unidirectional fashion while the voltage present thereacross is an A.C. Voltage, including circuitry for delaying the switch turning-on with respect to a zero crossing of the voltage thereacross, and circuitry for triggering the switch turning-off after its turning on, at the end of a predetermined time interval plus or minus an error time controlled by the duty cycle of the A.C. Voltage across the switch, in one or several previous periods. The control circuit applies to the forming of a rectifying circuit by the switch.

Abstract: A circuit for controlling a switch to be controlled in unidirectional fashion while the voltage present there across is an A.C. voltage, including circuitry for delaying the switch turning-on with respect to a zero crossing of the voltage there across, and circuitry for triggering the switch turning-off after its turning on, at the end of a predetermined time interval plus or minus an error time controlled by the duty cycle of the A.C. voltage across the switch, in one or several previous periods. The control circuit applies to the forming of a rectifying circuit by the switch.

Abstract: The invention concerns a control circuit for controlling a load to be supplied in alternating current voltage, comprising a two-way switch capable of being controlled by phase angle, in series with the load between two terminals applying the alternating current supply, and comprising, in parallel with the switch, a first resistive element, a first capacitor and an element, in series with the first resistive element and the first capacitor, and operating, in steady state conditions, as a constant current source, the midpoint of the association in series connection of the first resistive element and the first capacitor being connected, via an element with two-way conduction automatically triggered when the voltage at its terminals exceeds a predetermined threshold, to a terminal controlling the switch.

Abstract: The present invention relates to a voltage converting circuit adapted to being supplied by at least two rectified A.C. voltages of different levels, including at least two capacitors and a switching circuit to organize a parallel discharge of the capacitors, and to organize a series or parallel charge of the capacitors according to a supply voltage level.

Abstract: The present invention relates to a high voltage diode which has a fast turn-off, formed of a series connection of several diodes, the relative intrinsic dispersion of recovered charges between the diodes being smaller than 5%.

Abstract: The present invention relates to a device for controlling a composite bridge including two anode-gate thyristors, the cathodes of which are connected together to a positive output terminal, the gates of the two thyristors being interconnected. The device includes a single-throw switch, controllable to be turned off and on, connected on the one hand to the two thyristors and on the other hand to a reference potential, and control means to turn on the switch only in a predetermined voltage range around the zero voltage of an a.c. voltage of the composite bridge.

Abstract: The present invention relates to a switching device for selecting a voltage between an a.c. voltage and a d.c. voltage using the ground as a reference, meant to be controlled by a two-state signal, using the ground as a reference and of the same sign as the d.c. voltage, including means for adjusting the turn-on time of a switch in the selection of the d.c. voltage.

Abstract: The present invention relates to a device for improving the power factor of a rectifying bridge supplied by an a.c. voltage and meant to issue a rectified d.c. supply, including two capacitors mounted in series and having different values, a first charge path essentially meant for a first capacitor, a second switchable charge path and exclusively meant for a second capacitor with a value higher than the value of the first capacitor, a first switchable discharge path and essentially meant for the first capacitor, and a second discharge path exclusively meant for the second capacitor.

Abstract: A power factor correction device of a rectifier bridge supplied by an a.c. voltage for providing, by means of at least two capacitors, a rectified d.c. supply, comprises between two rectified supply lines a charge path of each capacitor; a switchable discharge path of each respective capacitor; a first control block for closing a first discharge path associated to a first capacitor only after the a.c. supply voltage crosses a maximum value; and a second control block for closing a second discharge path associated to a second capacitor at the expiry of a predetermined delay following the closing of the previous discharge path.