Valeo Equipements Electriques Moteur

Sgs-thomson Microelectronics S.r.l.

Sgs-thomson Microelectronics Limited

Equiepments Electroques Moteur

Didier Canitrot

Jean-Marie Pierret

Fabio Marchio

Alessio Pennisi

Jean M Pierret

Christian Ducrot

Jean-Francois Terasse

Ahmed Bchaier

Mario Rebelo

A detection circuit for detecting the voltage between phases of a polyphase alternator for the purpose of controlling the putting into operation of a regulator for regulating the charging of a motor vehicle battery by said alternator, the circuit comprising differential discrimination means for the amplitude of the voltage between a pair of phase signals delivered by the alternator. The differential discrimination means comprise a pair of transistors each constituting means for comparing the inter-phase voltage with a threshold voltage defined by its emitter-base junction voltage, said threshold voltages being of small magnitude and of opposite polarity with respect to each other.

Circuit for detecting the inter-phase voltage of an alternator for

A circuit for generating a reference voltage that varies as a function of temperature, in particular for regulating the voltage at which a battery is charged by an alternator, wherein the circuit comprises: a source of a voltage that is fixed regardless of temperature; two bipolar transistors whose bases are interconnected and whose base-emitter junctions have different temperature behaviors, with constant currents flowing through each of them; a first resistor connected between the emitters of the two transistors, with the voltage across the terminals thereof being representative of the temperature to which the two transistors are exposed; and a second resistor connected between the fixed voltage source and an output for the reference voltage, and through which a current may flow, at least over a predetermined range of temperatures, which current is equal to the additional current induced by an increase in the voltage across the terminals of said first resistor relative to a voltage which corresponds to a critical temperature.

Circuit for generating a reference voltage that varies as a function of

A circuit for detecting the state of a switch, in particular the state of a key contact for activating a regulator circuit for regulating the voltage at which a battery is charged by an alternator, in which a first terminal of the key switch is connected to a DC source and a second terminal of the key switch is connected to the regulator circuit via a load such as a warning lamp, said load being switched ON and OFF by means of a component having a voltage drop. The detection circuit is wherein it comprises amplifier means receiving a reference voltage on a first terminal, and on a second terminal the voltage present on a terminal of the load opposite from its terminal connected to the key switch, the amplifier means being designed to regulate the voltage drop to the value of the reference voltage so long as the key switch and the component having the voltage drop are conductive, and including means for generating a first signal on a key switch state detection output whenever said voltage present on the terminal is less than the reference voltage and for generating a second signal on said detection output whenever said voltage present on the terminal is greater than the reference voltage or whenever said amplifier means is regulating.

Circuit for detecting the state of a switch, in particular a car key

A regulator device for charging a battery from an alternator that delivers a rectified voltage including a ripple component. The device is of the type including a regulator circuit acting on the mean value of the rectified alternator voltage and includes a circuit for obtaining the main value, a threshold comparator, a time delay circuit, and a power stage for controlling the current flowing through the excitation winding of the alternator. According to the invention, the device includes a negative feedback circuit between a point downstream from the time delay circuit, and the input to the circuit for obtaining the mean value. The device also shifts the mean value downwards during periods when the excitation current is decreasing. The device is particularly applicable to increasing the frequency of regulation under a heavy load.

Voltage regulator device for charging a battery by an alternator

The invention relates to a regulator device for charging a battery by an alternator that delivers a rectified voltage including a ripple component. The device is of the type comprising a regulator circuit acting on the mean value of the rectified alternator voltage and a regulator circuit acting on the voltages of the positive peaks of the ripple component. The regulator circuits are powered by a stabilized voltage derived from the rectified alternator voltage and the device further comprises a power stage for controlling the excitation current of the alternator. According to the invention, the device further includes a regulator circuit acting on the values of the negative peaks of the ripple component. This regulator circuit is also powered by the stabilized voltage, and capable of causing the excitation current to be reduced whenever the voltage of the negative peaks falls below a given threshold.

Device for regulating the battery charging voltage delivered by an

A control member is connected to an air-conditioning computer and it receives therefrom a signal for triggering defrosting of the windshield. Switch-over means are connected to the rectified output of the alternator and connect the output either to the network for distributing electrical energy at the nominal voltage of the vehicle battery, or else to a network for feeding the electric windshield. The control member is constituted by a logic unit delivering a plurality of sequential control signals. These signals include at least one signal for controlling de-excitation of the inductor of the alternator, which signal is delivered to the excitation regulator, and a switchover control signal for controlling the switchover means. Raised-voltage regulation is inhibited so long as the battery is connected to the rectified output of the alternator and it is enabled when the windshield is connected to the rectified ouptut of the alternator. The invention is applicable to power supply circuits in motor vehicles, including heavy goods vehicles, utility vehicles, and private cars.

System for controlling raised-voltage defrosting of an electric

The invention relates to a high voltage electrical power supply device for an auxiliary circuit CA of a motor vehicle.

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Saint Maur des Fosses, France

Didier Canitrot