WO2014037642A1 - Electronic device suitable for generating power supply voltage intended for supplying power to a mobile apparatus - Google Patents

Electronic device suitable for generating power supply voltage intended for supplying power to a mobile apparatus Download PDF

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Publication number
WO2014037642A1
WO2014037642A1 PCT/FR2013/051911 FR2013051911W WO2014037642A1 WO 2014037642 A1 WO2014037642 A1 WO 2014037642A1 FR 2013051911 W FR2013051911 W FR 2013051911W WO 2014037642 A1 WO2014037642 A1 WO 2014037642A1
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WO
WIPO (PCT)
Prior art keywords
voltage
cable
electronic equipment
gnd
generating
Prior art date
Application number
PCT/FR2013/051911
Other languages
French (fr)
Inventor
Alexandre Fromion
Original Assignee
Peugeot Citroen Automobiles Sa
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Peugeot Citroen Automobiles Sa filed Critical Peugeot Citroen Automobiles Sa
Priority to CN201380046476.2A priority Critical patent/CN104718510A/en
Priority to EP13758955.2A priority patent/EP2893414A1/en
Publication of WO2014037642A1 publication Critical patent/WO2014037642A1/en

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/26—Power supply means, e.g. regulation thereof
    • G06F1/266—Arrangements to supply power to external peripherals either directly from the computer or under computer control, e.g. supply of power through the communication port, computer controlled power-strips

Definitions

  • the invention relates to electronic equipment having a connector capable of supplying a voltage for powering a mobile device.
  • Most mobile devices (phones, digital music players, ...) has a connector for connecting them via a cable to electronic equipment (for example a computer or a vehicle multimedia computer).
  • electronic equipment for example a computer or a vehicle multimedia computer.
  • Such a connection makes it possible, on the one hand, to exchange data between the mobile device and the electronic equipment and, on the other hand, to supply electricity to the mobile device.
  • a connection complying with the USB 2.0 standard can power a device with a supply voltage between 4.75V and 5.25V.
  • the document US201 1/0121801 discloses a system taking into account ohmic losses upstream of a voltage regulator by adjusting the current delivered as a function of a voltage measurement.
  • the invention therefore aims in particular to remedy this drawback by proposing electronic equipment comprising means for generating a regulated supply voltage within a range of predetermined values.
  • the solution according to the invention takes advantage of the cable structure between the electronic equipment and the mobile device, to ensure the output voltage on the connector at the end of the cable and connected to the mobile device.
  • the solution uses the shield of the cable, which is not traversed by any current and which is connected to the power supply of the mobile device.
  • the voltage measured in the shield determines the voltage drop in the power cable.
  • the means for measuring the voltage in the shielding of the cable comprise a capacity connected to a mass of the electronic equipment, the shielding of the cable being connected to the ground (Gnd) of the electronic equipment by capacitive coupling.
  • the means for measuring the voltage in the cable shield further comprise a resistor placed in parallel with the capacitor or any other component allowing the protection against static (electrostatic discharge).
  • the means for generating a regulated voltage from the supply voltage and the voltage measured in the cable shield comprise an amplifier delivering an amplified voltage from the voltage measured in the cable shield.
  • the means for generating a regulated voltage from the supply and voltage voltage measured in the shielding of the cable comprise a voltage regulator delivering a regulated voltage equal to the sum of the supply voltage and the voltage. amplified voltage.
  • the assembly comprising the amplifier and the voltage regulator is made by a single integrated component.
  • the electronic equipment according to the invention comprises a first connector Cr1 compliant with the USB standard.
  • the invention also relates to a power supply system comprising electronic equipment according to the invention and a shielded cable adapted to be connected to said electronic equipment.
  • the invention also relates to a vehicle comprising electronic equipment according to the invention or a supply system according to the invention.
  • Figure 1 illustrates an electronic device according to the invention connected to a mobile device by a shielded cable .
  • FIG. 1 shows an electronic equipment 10 according to the invention connected to a mobile device 1 1 by a shielded cable 12.
  • the electronic equipment 10 is a multimedia computer
  • the mobile device 1 1 is a telephone mobile and they are connected by a USB type connection (Universal Serial Bus).
  • USB type connection Universal Serial Bus
  • the electronic equipment 10 comprises a first connector Cr1.
  • the nomadic device 1 1 comprises a second connector Cr2.
  • the cable 12 comprises at these ends a third Cr3 and a fourth Cr4 connector.
  • the fourth connector Cr4 is for example connected to the first connector Cr1.
  • the third connector Cr is then connected to the second connector Cr2.
  • the cable has a first 12.1 and a second 12.2 conductor in which circulates a current lusb consumed by the nomadic apparatus 1 1.
  • the first driver 12.1 connects the power supply provided by the on-board equipment to the nomadic equipment.
  • the second conductor 12.2 connects the ground Gnd of the electronic equipment 1 0 to the ground Gnd 'of the mobile device 1 1.
  • the two conductor son 1 2.1 1 2.2 are identical (made of the same material, and have the same linear resistance) and are subjected to the same temperature (due to their confinement), and the same mechanical stress. We can therefore consider that they have substantially the same resistance (within a few percent).
  • the resistances of each conductor 12.1, 12.2 and associated connectors CM, Cr2, Cr3, Cr4 are represented by a resistor Rc on each of the conductive wires.
  • the cable 12 further comprises another conductor D + / D- for the exchange of data between the electronic equipment 10 and the mobile device 1 1 and which is not used in the context of the invention.
  • the shielding 13 of the cable 1 2 is connected to the supply ground Gnd 'of the mobile device 1 1, when the connector of the cable Cr3 is connected to that Cr2 of the mobile device 1 1.
  • the connectors and the power cable cause a voltage drop which implies that the voltage at the connector Cr1 of the electronic equipment 1 0 is different from the voltage applied to the mobile device 1 1.
  • the voltage V B used applied to the nomadic equipment 1 1 is worth:
  • VeilSe VQ-1 - 2 * R c * lusb-
  • R c is the total resistance of the first conductor 12.1 and therefore of the second conductor 12.2 (which have the same resistance as explained above), the usb is the current consumed by the nomadic equipment 1 1.
  • the voltage Veuse can easily fall below 4.75V (for total resistance R c greater than 0.25 Ohm) which corresponds to the minimum service voltage defined by the USB2 standard .0.
  • the electronic equipment 10 comprises means (not shown) for generating a supply voltage V B us.
  • the electronic equipment 10 further comprises: means for measuring the voltage V G n in the shield 13 of the cable 12 and means for generating a regulated voltage V BU s' from the supply voltage V B us and the voltage V Gn measured in the shield 13.
  • the shield 13 of the cable 12 (connected to the ground on the side of the mobile device 1 1) is used as a sensor of the voltage drop due to the resistance of the ground conductor (in other words the second conductor 12.2).
  • the value of this voltage drop can be used to determine the voltage drop associated with the power supply conductor (ie the first conductor 12.1) and Cr1, Cr2, Cr3 and Cr4 connectors.
  • the measured voltage drop it is then possible to compensate for the voltage drop due to the cable by controlling the supply voltage that is delivered to the first connector Cr1.
  • the voltage delivered at the first connector Cr1 is increased to obtain the desired voltage (ie the supply voltage V B us) at the third connector Cr3.
  • the means for measuring the voltage V Gn d in the shield 13 of the cable 12 comprise a capacitor C connected to the ground Gnd of the electronic equipment 10, the shielding 13 of the cable 12 being connected to the ground Gnd of the electronic equipment 10 by capacitive coupling.
  • the required capacity is for example of the ceramic type with a indicative value from 1 to 10 ⁇ . This type of capacity combines high value and excellent high frequency characteristics.
  • the means for measuring the voltage V Gr , d 'in the shielding 13 of the cable 12 further comprise a resistor R placed in parallel with the capacitor C or any other component enabling protection against static (electrostatic discharge).
  • the resistor R is also connected to the ground Gnd of the electronic equipment 10.
  • the resistor R has a high impedance 10 to 100 K ohms whose value is very large in front of the resistance of the cable. This makes it possible to set a continuous potential of this connection point and to avoid a variable floating potential (by electrostatic charge).
  • the capacitor C ensures the connection to the ground of the radio-frequency equipment and thus makes it possible to maintain the screen effect of the shielding of the USB cable.
  • the means for generating a regulated voltage V B us' from the supply voltage V B us and the voltage V Gn measured in the shield 13 comprises an amplifier A delivering an amplified voltage V A from the voltage V Gr , of measured in the shield 13.
  • the means for generating a regulated voltage V B us 'from the supply voltage V B us and the voltage V Gnd > measured in the shield 13 further comprises a voltage regulator 20 delivering a regulated voltage Bus' equal to the sum of the supply voltage V BU s and the amplified voltage V A.
  • the assembly comprising amplifier A and voltage regulator 20 is produced by a single integrated component.
  • the measured voltage V gr from the input of the electronic equipment 10 to the point S is equal to usb * R c (with usb the current consumed by the nomadic apparatus 1 1 and R c the resistance of the second 12.2 conductor and associated connectors).
  • first conductor 12.1 and the second conductor 12.2 have substantially the same resistance.
  • the measured voltage V gnd ' is multiplied by two by the amplifier A.
  • the output voltage V A of the amplifier A therefore represents the total voltage drop generated by the current I usb on the two conductors 12.1, 1 2.2. cable supply 12.
  • the output voltage V A of the amplifier A is summed with the supply voltage V B us (which is between 4.75V and 5.25V, according to the USB 2.0 standard, for example 5V) at the regulator level. voltage 20.
  • the voltage output of the regulator V B us' is:
  • VBUS ' is the output voltage of the equipment at the automotive USB connector.
  • V B use V B us (the nominal voltage of the USB standard).
  • the supply voltage V BU of the nomadic device is therefore maintained at a value regardless of its current consumption (within the capacity limit of the current regulator and output voltage) and whatever the variations, in temperature and / or aging, the resistance of the cable and the contact resistance of the connectors.
  • This arrangement makes it possible, for example, to power a USB type device with a nominal voltage in accordance with the USB 2.0 standard for currents higher than the USB 2.0 (500mA) standard, ie from 1 to 2A for example. It is nevertheless necessary to respect the maximum specifications of the cable.
  • the signal can be filtered with a 2nd or 3rd order low pass filter.
  • the A1 amp can include this filtering cell (low pass function) and gain (x2) as a 2nd order active butterworth cell with a low cutoff frequency ( ⁇ 5Hz) (Salen-Key structure).
  • the voltage regulator should be compensated if necessary to avoid any instability related to the phase rotation of the filter.
  • the capacitor C also participates in the high-frequency filtering by draining the current of the shielding towards the mass. It will be possible to choose a ceramic capacity of 1 ⁇ for example which combines quality of filtering H F and high capacity (to reduce the noise band).
  • the invention has the advantage of being compatible with another standard than USB 2.0, for example the USB 3.0 standard providing for an increase in the minimum output current (900mA instead of 500mA for USB 2.0).
  • the invention also relates to an electricity supply system comprising equipment according to one of the preceding claims and a shielded cable connected to said equipment.
  • the invention also relates to a vehicle comprising electronic equipment according to the invention or a supply system according to the invention.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
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  • Details Of Connecting Devices For Male And Female Coupling (AREA)

Abstract

The invention relates to an electronic device (10) comprising a means for generating power supply voltage (VBUS) intended for supplying power to a mobile apparatus (11) via a shielded cable (12), the shielding (13) of the cable (12) being connected to a supply ground (Gnd') of the mobile apparatus (11), the electronic device (10) being characterised in that same includes: a means for measuring the voltage (VGnd') in the shielding (13) of the cable (12), and a means for generating a regulated voltage (VΒUS') from power supply voltage (VBUS) and the voltage (VGnd') in the shielding (13) of the cable (12).

Description

EQUIPEMENT ELECTRONIQUE APTE A GENERER UNE TENSION D'ALIMENTATION DESTINEE A ALIMENTER UN APPAREIL NOMADE  ELECTRONIC EQUIPMENT CAPABLE OF GENERATING A POWER SUPPLY VOLTAGE TO FEED A NOMADIC APPARATUS
L'invention concerne des équipements électroniques disposant d'un connecteur apte à fournir une tension destinée à alimenter un appareil mobile. The invention relates to electronic equipment having a connector capable of supplying a voltage for powering a mobile device.
La plupart des appareils nomades (téléphones, baladeurs numériques, ...) comporte un connecteur permettant de les connecter via un câble à un équipement électronique (par exemple un ordinateur ou un calculateur multimédia de véhicule). Une telle connexion permet, d'une part, d'échanger des données entre l'appareil nomade et l'équipement électronique et, d'autre part, d'alimenter en électricité l'appareil nomade. Par exemple, une connexion respectant la norme USB 2.0 permet d'alimenter un appareil avec une tension d'alimentation comprise entre 4,75V et 5,25V. Most mobile devices (phones, digital music players, ...) has a connector for connecting them via a cable to electronic equipment (for example a computer or a vehicle multimedia computer). Such a connection makes it possible, on the one hand, to exchange data between the mobile device and the electronic equipment and, on the other hand, to supply electricity to the mobile device. For example, a connection complying with the USB 2.0 standard can power a device with a supply voltage between 4.75V and 5.25V.
L'augmentation de la longueur des câbles, en particulier dans le contexte automobile où les connexions USB sont distantes des calculateurs de gestion de la connectivité, ainsi que l'augmentation des demandes en courant des appareils nomades entraînent des chutes de tensions susceptibles de provoquer des disfonctionnements des appareils nomades. The increase in the length of the cables, particularly in the automotive context where USB connections are distant from the connectivity management computers, as well as the increase in the current demands of nomadic devices cause voltage drops that could cause problems. malfunctions of nomadic devices.
En effet, l'augmentation de la consommation en courant de l'appareil ainsi que l'augmentation de la longueur des câbles impliquent que la tenue de la tension de sortie conforme à la norme USB 2.0 devient plus difficile. Indeed, the increase in power consumption of the device and the increase in the length of the cables imply that the holding of the output voltage compliant with the USB 2.0 standard becomes more difficult.
Le document US201 1/0121801 divulgue un système prenant en compte des pertes ohmiques en amont d'un régulateur de tension en ajustant le courant délivré en fonction d'une mesure de tension.  The document US201 1/0121801 discloses a system taking into account ohmic losses upstream of a voltage regulator by adjusting the current delivered as a function of a voltage measurement.
Un des inconvénients d'un tel système est qu'il ne tient pas compte des pertes ohmiques en aval du régulateur de tension, autrement dit, les pertes liées au câble reliant le système à l'appareil rechargé.  One of the drawbacks of such a system is that it does not take into account the ohmic losses downstream of the voltage regulator, in other words, the losses associated with the cable connecting the system to the recharged device.
L'invention a donc pour but notamment de remédier à cet inconvénient en proposant équipement électronique comportant des moyens pour générer une tension d'alimentation régulée comprise dans une plage de valeurs prédéterminée. The invention therefore aims in particular to remedy this drawback by proposing electronic equipment comprising means for generating a regulated supply voltage within a range of predetermined values.
Elle propose plus précisément à cet effet un équipement électronique comportant des moyens pour générer une tension d'alimentation destinée à alimenter un appareil nomade au travers d'un câble blindé, le blindage du câble étant relié à une masse d'alimentation de l'appareil nomade, l'équipement électronique étant caractérisé en ce qu'il comprend : des moyens de mesure de la tension dans le blindage du câble et, It proposes more specifically for this purpose electronic equipment comprising means for generating a supply voltage for supplying a nomadic device through a shielded cable, the shielding of the cable being connected to a power supply of the device nomadic, the electronic equipment being characterized in that it comprises: means for measuring the voltage in the cable shield and,
des moyens de génération d'une tension régulée à partir de la tension d'alimentation et de la tension dans le blindage du câble.  means for generating a regulated voltage from the supply voltage and the voltage in the cable shield.
La solution selon l'invention tire parti de la structure du câble entre l'équipement électronique et l'appareil nomade, pour permettre de garantir la tension de sortie sur le connecteur situé à l'extrémité du câble et connecté à l'appareil nomade. The solution according to the invention takes advantage of the cable structure between the electronic equipment and the mobile device, to ensure the output voltage on the connector at the end of the cable and connected to the mobile device.
La solution utilise le blindage du câble, qui n'est parcouru par aucun courant et qui est relié à la masse d'alimentation de l'appareil nomade. La tension mesurée dans le blindage permet de déterminer la chute de tension dans le câble d'alimentation.  The solution uses the shield of the cable, which is not traversed by any current and which is connected to the power supply of the mobile device. The voltage measured in the shield determines the voltage drop in the power cable.
Avantageusement, les moyens de mesure de la tension dans le blindage du câble comportent une capacité reliée à une masse de l'équipement électronique, le blindage du câble étant connecté à la masse (Gnd) de l'équipement électronique par couplage capacitif. Advantageously, the means for measuring the voltage in the shielding of the cable comprise a capacity connected to a mass of the electronic equipment, the shielding of the cable being connected to the ground (Gnd) of the electronic equipment by capacitive coupling.
Avantageusement, les moyens de mesure de la tension dans le blindage du câble comportent en outre une résistance placée en parallèle de la capacité ou tout autre composant permettant la protection contre les parasites (décharges électrostatiques). Advantageously, the means for measuring the voltage in the cable shield further comprise a resistor placed in parallel with the capacitor or any other component allowing the protection against static (electrostatic discharge).
Avantageusement, les moyens de génération d'une tension régulée à partir de la tension d'alimentation et de la tension mesurée dans le blindage du câble comportent un amplificateur délivrant une tension amplifié à partir de la tension mesurée dans le blindage du câble. Avantageusement, les moyens de génération d'une tension régulée à partir de la tension d'alimentation et de tension mesurée dans le blindage du câble comportent un régulateur de tension délivrant une tension régulée égale à la somme de la tension d'alimentation et de la tension amplifiée. Advantageously, the means for generating a regulated voltage from the supply voltage and the voltage measured in the cable shield comprise an amplifier delivering an amplified voltage from the voltage measured in the cable shield. Advantageously, the means for generating a regulated voltage from the supply and voltage voltage measured in the shielding of the cable comprise a voltage regulator delivering a regulated voltage equal to the sum of the supply voltage and the voltage. amplified voltage.
Avantageusement, l'ensemble comprenant l'amplificateur et le régulateur de tension est réalisé par un unique composant intégré. Advantageously, the assembly comprising the amplifier and the voltage regulator is made by a single integrated component.
Avantageusement, l'équipement électronique selon l'invention, comporte un premier connecteur Cr1 conforme à la norme USB. Advantageously, the electronic equipment according to the invention comprises a first connector Cr1 compliant with the USB standard.
L'invention concerne aussi un système d'alimentation en électricité comportant un équipement électronique selon l'invention et un câble blindé apte à être branché sur ledit équipement électronique. The invention also relates to a power supply system comprising electronic equipment according to the invention and a shielded cable adapted to be connected to said electronic equipment.
L'invention concerne aussi un véhicule comportant un équipement électronique selon l'invention ou un système d'alimentation selon l'invention.  The invention also relates to a vehicle comprising electronic equipment according to the invention or a supply system according to the invention.
D'autres caractéristiques et avantages de l'invention apparaîtront à l'examen de la description détaillée ci-après, et des dessins annexés, sur lesquels la figure 1 illustre un équipement électronique selon l'invention relié à un appareil nomade par un câble blindé.  Other features and advantages of the invention will appear on examining the detailed description below, and the accompanying drawings, in which Figure 1 illustrates an electronic device according to the invention connected to a mobile device by a shielded cable .
Les dessins annexés pourront non seulement servir à compléter l'invention, mais aussi contribuer à sa définition, le cas échéant.  The attached drawings may not only serve to complete the invention, but also contribute to its definition, if any.
La figure 1 montre un équipement électronique 10 selon l'invention relié à un appareil nomade 1 1 par un câble blindé 12. On suppose par exemple que l'équipement électronique 10 est un calculateur multimédia, que l'appareil nomade 1 1 est un téléphone mobile et qu'ils sont reliés par une connexion de type USB (pour Universal Sériai Bus). FIG. 1 shows an electronic equipment 10 according to the invention connected to a mobile device 1 1 by a shielded cable 12. For example, it is assumed that the electronic equipment 10 is a multimedia computer, that the mobile device 1 1 is a telephone mobile and they are connected by a USB type connection (Universal Serial Bus).
L'équipement électronique 10 comporte un premier connecteur Cr1 . L'appareil nomade 1 1 comporte un second connecteur Cr2. Le câble 12 comporte à ces extrémités un troisième Cr3 et un quatrième Cr4 connecteur. Le quatrième connecteur Cr4 est par exemple branché sur le premier connecteur Cr1 . Le troisième connecteur Cr est alors branché sur le deuxième connecteur Cr2. The electronic equipment 10 comprises a first connector Cr1. The nomadic device 1 1 comprises a second connector Cr2. The cable 12 comprises at these ends a third Cr3 and a fourth Cr4 connector. The fourth connector Cr4 is for example connected to the first connector Cr1. The third connector Cr is then connected to the second connector Cr2.
Le câble comporte un premier 12.1 et un second 12.2 conducteur dans lesquels circule un courant lusb consommé par l'appareil nomade 1 1 . The cable has a first 12.1 and a second 12.2 conductor in which circulates a current lusb consumed by the nomadic apparatus 1 1.
Le premier conducteur 12.1 relie l'alimentation fournit par l'équipement embarqué à l'équipement nomade. Le deuxième conducteur 12.2 relie la masse Gnd de l'équipement électronique 1 0 à la masse Gnd' de l'appareil nomade 1 1 . The first driver 12.1 connects the power supply provided by the on-board equipment to the nomadic equipment. The second conductor 12.2 connects the ground Gnd of the electronic equipment 1 0 to the ground Gnd 'of the mobile device 1 1.
Les deux fils conducteurs 1 2.1 1 2.2 sont identiques (réalisés dans la même matière, et présentent une résistance linéique identique) et sont soumis à la même température (du fait de leur confinement), et au même stress mécanique. On peut donc considérer qu'ils ont sensiblement la même résistance (à quelques pourcents près). Les résistances de chaque conducteur 12.1 , 12.2 et des connecteurs associés CM , Cr2, Cr3, Cr4 sont représentées par une résistance Rc sur chacun des fils conducteurs. The two conductor son 1 2.1 1 2.2 are identical (made of the same material, and have the same linear resistance) and are subjected to the same temperature (due to their confinement), and the same mechanical stress. We can therefore consider that they have substantially the same resistance (within a few percent). The resistances of each conductor 12.1, 12.2 and associated connectors CM, Cr2, Cr3, Cr4 are represented by a resistor Rc on each of the conductive wires.
Le câble 12 comporte en outre un autre conducteur D+/D- destinée à l'échange de données entre l'équipement électronique 10 et l'appareil nomade 1 1 et qui n'est pas utilisé dans le cadre de l'invention. The cable 12 further comprises another conductor D + / D- for the exchange of data between the electronic equipment 10 and the mobile device 1 1 and which is not used in the context of the invention.
Le blindage 13 du câble 1 2 est relié à la masse d'alimentation Gnd' de l'appareil nomade 1 1 , lorsque le connecteur du câble Cr3 est relié à celui Cr2 de l'appareil nomade 1 1 . The shielding 13 of the cable 1 2 is connected to the supply ground Gnd 'of the mobile device 1 1, when the connector of the cable Cr3 is connected to that Cr2 of the mobile device 1 1.
Les connecteurs et le câble d'alimentation provoquent une chute de tension qui implique que la tension au niveau du connecteur Cr1 de l'équipement électronique 1 0 est différente la tension appliquée à l'appareil nomade 1 1 . The connectors and the power cable cause a voltage drop which implies that the voltage at the connector Cr1 of the electronic equipment 1 0 is different from the voltage applied to the mobile device 1 1.
La tension VBuse appliquée à l'équipement nomade 1 1 vaut : The voltage V B used applied to the nomadic equipment 1 1 is worth:
VeilSe = VQ-1 - 2 * Rc * lusb- VeilSe = VQ-1 - 2 * R c * lusb-
Avec VCri la tension délivrée au niveau du premier connecteur Cr1 , With V Cr i the voltage delivered at the first connector Cr1,
Rc est la résistance totale du premier conducteur 12.1 et donc du deuxième conducteur 12.2 (qui ont la même résistance comme expliqué plus haut), lusb est le courant consommé par l'équipement nomade 1 1 . R c is the total resistance of the first conductor 12.1 and therefore of the second conductor 12.2 (which have the same resistance as explained above), the usb is the current consumed by the nomadic equipment 1 1.
Par exemple, pour un appareil consommant 1 A, si la tension VCri délivrée au niveau du premier connecteur Cr1 est de 5V, alors la tension Veuse peut facilement tomber en dessous de 4,75V (pour résistance totale Rc supérieure à 0,25 Ohm) qui correspond à la tension minimum de service définie par la norme USB2.0. For example, for a device consuming 1 A, if the voltage V Cr i delivered at the first connector Cr1 is 5V, then the voltage Veuse can easily fall below 4.75V (for total resistance R c greater than 0.25 Ohm) which corresponds to the minimum service voltage defined by the USB2 standard .0.
L'équipement électronique 10 comporte des moyens (non représentés) pour générer une tension d'alimentation VBus- L'équipement électronique 10 comprend en outre : des moyens de mesure de la tension VGnd' dans le blindage 13 du câble 12 et, des moyens de génération d'une tension régulée VBUs' à partir de la tension d'alimentation VBus et de la tension VGnd' mesurée dans le blindage 13. The electronic equipment 10 comprises means (not shown) for generating a supply voltage V B us. The electronic equipment 10 further comprises: means for measuring the voltage V G n in the shield 13 of the cable 12 and means for generating a regulated voltage V BU s' from the supply voltage V B us and the voltage V Gn measured in the shield 13.
Le blindage 13 du câble 12 (relié à la masse du côté de l'appareil nomade 1 1 ) est utilisé comme capteur de la chute de tension due à la résistance du conducteur de masse (autrement dit du deuxième conducteur 12.2). Par extension, la valeur de cette chute de tension peut être utilisée pour déterminer la chute de tension liée au conducteur d'alimentation électrique (autrement dit le premier conducteur 12.1 ) et des connecteurs Cr1 , Cr2, Cr3 et Cr4. The shield 13 of the cable 12 (connected to the ground on the side of the mobile device 1 1) is used as a sensor of the voltage drop due to the resistance of the ground conductor (in other words the second conductor 12.2). By extension, the value of this voltage drop can be used to determine the voltage drop associated with the power supply conductor (ie the first conductor 12.1) and Cr1, Cr2, Cr3 and Cr4 connectors.
Une fois la chute de tension mesurée, il est alors possible d'effectuer une compensation de la chute de tension due au câble en pilotant la tension d'alimentation qui est délivrée sur le premier connecteur Cr1 . La tension délivrée au niveau du premier connecteur Cr1 est augmentée de façon à obtenir la tension souhaitée (autrement dit la tension d'alimentation VBus) au niveau du troisième connecteur Cr3. Once the measured voltage drop, it is then possible to compensate for the voltage drop due to the cable by controlling the supply voltage that is delivered to the first connector Cr1. The voltage delivered at the first connector Cr1 is increased to obtain the desired voltage (ie the supply voltage V B us) at the third connector Cr3.
Selon une caractéristique de l'invention, les moyens de mesure de la tension VGnd' dans le blindage 13 du câble 12 comportent une capacité C reliée à la masse Gnd de l'équipement électronique 10, le blindage 13 du câble 12 étant connecté à la masse Gnd de l'équipement électronique 10 par couplage capacitif. According to a characteristic of the invention, the means for measuring the voltage V Gn d in the shield 13 of the cable 12 comprise a capacitor C connected to the ground Gnd of the electronic equipment 10, the shielding 13 of the cable 12 being connected to the ground Gnd of the electronic equipment 10 by capacitive coupling.
La capacité requise est par exemple du type céramique avec une valeur indicative de 1 à 10μΡ. Ce type de capacité allie forte valeur et excellente caractéristique hautes fréquences. The required capacity is for example of the ceramic type with a indicative value from 1 to 10μΡ. This type of capacity combines high value and excellent high frequency characteristics.
Avantageusement, les moyens de mesure de la tension VGr,d' dans le blindage 13 du câble 12 comportent en outre une résistance R placée en parallèle de la capacité C ou tout autre composant permettant la protection contre les parasites (décharges électrostatiques). La résistance R est aussi connectée à la masse Gnd de l'équipement électronique 10. Advantageously, the means for measuring the voltage V Gr , d 'in the shielding 13 of the cable 12 further comprise a resistor R placed in parallel with the capacitor C or any other component enabling protection against static (electrostatic discharge). The resistor R is also connected to the ground Gnd of the electronic equipment 10.
La résistance R présente une forte impédance 10 à 100 K Ohms dont la valeur est très grande devant la résistance du câble. Ceci permet de fixer un potentiel continu de ce point de connexion et éviter un potentiel flottant variable (par charge électrostatique). La capacité C assure la connexion à la masse de l'équipement en radio-fréquence et permet donc de maintenir l'effet d'écran du blindage du câble USB. The resistor R has a high impedance 10 to 100 K ohms whose value is very large in front of the resistance of the cable. This makes it possible to set a continuous potential of this connection point and to avoid a variable floating potential (by electrostatic charge). The capacitor C ensures the connection to the ground of the radio-frequency equipment and thus makes it possible to maintain the screen effect of the shielding of the USB cable.
Les moyens de génération d'une tension régulée VBus' à partir de la tension d'alimentation VBus et de la tension VGnd' mesurée dans le blindage 13 comporte un amplificateur A délivrant une tension amplifié VA à partir de la tension VGr,d' mesurée dans le blindage 13. The means for generating a regulated voltage V B us' from the supply voltage V B us and the voltage V Gn measured in the shield 13 comprises an amplifier A delivering an amplified voltage V A from the voltage V Gr , of measured in the shield 13.
Les moyens de génération d'une tension régulée VBus' à partir de la tension d'alimentation VBus et de la tension VGnd> mesurée dans le blindage 13 comporte en outre un régulateur de tension 20 délivrant une tension régulée Bus' égale à la somme de la tension d'alimentation VBUs et de la tension amplifiée VA. The means for generating a regulated voltage V B us 'from the supply voltage V B us and the voltage V Gnd > measured in the shield 13 further comprises a voltage regulator 20 delivering a regulated voltage Bus' equal to the sum of the supply voltage V BU s and the amplified voltage V A.
Selon un mode de réalisation de l'invention, l'ensemble comprenant l'amplificateur A et régulateur de tension 20 est réalisé par un unique composant intégré. According to one embodiment of the invention, the assembly comprising amplifier A and voltage regulator 20 is produced by a single integrated component.
La tension mesurée Vgr,d' à l'entrée de l'équipement électronique 10 au point S est égale à lusb * Rc (avec lusb le courant consommé par l'appareil nomade 1 1 et Rc la résistance du second conducteur 12.2 et des connecteurs associés). The measured voltage V gr , from the input of the electronic equipment 10 to the point S is equal to usb * R c (with usb the current consumed by the nomadic apparatus 1 1 and R c the resistance of the second 12.2 conductor and associated connectors).
Comme expliqué précédemment, on considère que le premier conducteur 12.1 et le second conducteur 12.2 ont sensiblement la même résistance. As previously explained, it is considered that the first conductor 12.1 and the second conductor 12.2 have substantially the same resistance.
La tension mesurée Vgnd' est multipliée par deux par l'amplificateur A. La tension de sortie VA de l'amplificateur A représente donc la chute de tension totale générée par le courant lusb sur les deux conducteurs 12.1 , 1 2.2 d'alimentation du câble 12. The measured voltage V gnd 'is multiplied by two by the amplifier A. The output voltage V A of the amplifier A therefore represents the total voltage drop generated by the current I usb on the two conductors 12.1, 1 2.2. cable supply 12.
La tension de sortie VA de l'amplificateur A est sommée à la tension d'alimentation VBus (qui est comprise entre 4,75V et 5,25V, conformément à la norme USB 2.0, par exemple 5V) au niveau de régulateur de tension 20. The output voltage V A of the amplifier A is summed with the supply voltage V B us (which is between 4.75V and 5.25V, according to the USB 2.0 standard, for example 5V) at the regulator level. voltage 20.
La tension sortie du régulateur VBus' vaut :
Figure imgf000008_0001
The voltage output of the regulator V B us' is:
Figure imgf000008_0001
VBUS' est donc la tension de sortie de l'équipement au niveau du connecteur USB automobile.  VBUS 'is the output voltage of the equipment at the automotive USB connector.
La tension d'alimentation de l'équipement nomade connecté au câble est : VeilSe = VBUS' - 2 * Rc * lusb The supply voltage of the nomadic equipment connected to the cable is: VeilSe = VBUS '- 2 * R c * lusb
Comme VBus' = VBus + 2 x Vgnd' et Vgnd' = Rc * lusb Since V B us '= V B us + 2 x V gn d' and V gn d = Rc * lusb
Alors VBuse = VBus (la tension nominale de la norme USB). Then V B use = V B us (the nominal voltage of the USB standard).
La tension d'alimentation VBUse de l'appareil nomade est donc maintenue à une valeur conforme quel que soit sa consommation de courant (dans la limite de capacité du régulateur en courant et en tension de sortie) et quelques soient les variations, en température et/ou en vieillissement, de la résistance du câble et de la résistance de contact des connecteurs. The supply voltage V BU of the nomadic device is therefore maintained at a value regardless of its current consumption (within the capacity limit of the current regulator and output voltage) and whatever the variations, in temperature and / or aging, the resistance of the cable and the contact resistance of the connectors.
Ce montage permet par exemple d'alimenter un périphérique de type USB avec une tension nominale conforme à la norme USB 2.0 pour des courants supérieurs à la norme USB 2.0 (500mA) soit de 1 à 2A par exemple. Il est malgré tout nécessaire de respecter les spécifications maximales du câble. This arrangement makes it possible, for example, to power a USB type device with a nominal voltage in accordance with the USB 2.0 standard for currents higher than the USB 2.0 (500mA) standard, ie from 1 to 2A for example. It is nevertheless necessary to respect the maximum specifications of the cable.
Il est à noter que la régulation de la tension de sortie n'est nécessaire qu'en basses fréquences. Les hautes fréquences sont filtrées par les capacités incluses dans l'équipement nomade. It should be noted that the regulation of the output voltage is necessary only at low frequencies. High frequencies are filtered by capabilities included in the nomadic equipment.
Afin de limiter les influences haute fréquence de la tension de bruit du blindage, le signal peut être filtré avec un filtre passe bas d'ordre 2 ou 3. L'ampli A1 peut inclure cette cellule de filtrage (fonction passe bas) et de gain (x2) sous forme d'une cellule active de butterworth de 2eme ordre avec une fréquence de coupure basse (<5Hz) (structure Salen-Key). On peut aussi choisir une cellule de filtrage passive. Le régulateur de tension devra être compensé si nécessaire pour éviter toute instabilité lié à la rotation de phase du filtre. La capacité C participe aussi au filtrage haute fréquence en drainant le courant du blindage vers la masse. On pourra choisir une capacité céramique de 1 μΡ par exemple qui allie qualité de filtrage H F et forte capacité (pour réduire la bande de bruit). In order to limit the high frequency influences of the shielding noise voltage, the signal can be filtered with a 2nd or 3rd order low pass filter. The A1 amp can include this filtering cell (low pass function) and gain (x2) as a 2nd order active butterworth cell with a low cutoff frequency (<5Hz) (Salen-Key structure). One can also choose a passive filter cell. The voltage regulator should be compensated if necessary to avoid any instability related to the phase rotation of the filter. The capacitor C also participates in the high-frequency filtering by draining the current of the shielding towards the mass. It will be possible to choose a ceramic capacity of 1 μΡ for example which combines quality of filtering H F and high capacity (to reduce the noise band).
L'invention a pour avantage d'être compatible avec d'autre norme que l'USB 2.0, par exemple la norme USB 3.0 prévoyant une augmentation du courant de sortie minimum (900mA au lieu de 500mA pour l'USB 2.0). The invention has the advantage of being compatible with another standard than USB 2.0, for example the USB 3.0 standard providing for an increase in the minimum output current (900mA instead of 500mA for USB 2.0).
L'invention concerne aussi un système d'alimentation en électricité comportant un équipement selon l'une des revendications précédentes et un câble blindé branché sur ledit équipement. The invention also relates to an electricity supply system comprising equipment according to one of the preceding claims and a shielded cable connected to said equipment.
L'invention concerne aussi un véhicule comportant un équipement électronique selon l'invention ou un système d'alimentation selon l'invention.  The invention also relates to a vehicle comprising electronic equipment according to the invention or a supply system according to the invention.

Claims

REVENDICATIONS
1 . Equipement électronique (10) comportant des moyens pour générer une tension d'alimentation (VBus) destinée à alimenter un appareil nomade (1 1 ) au travers d'un câble blindé (12), le blindage (13) du câble (12) étant relié à une masse d'alimentation (Gnd') de l'appareil nomade (1 1 ), l'équipement électronique (10) étant caractérisé en ce qu'il comprend : 1. Electronic equipment (10) comprising means for generating a supply voltage (V B us) for supplying a nomadic device (1 1) through a shielded cable (12), the shielding (13) of the cable (12) ) being connected to a supply ground (Gnd ') of the nomadic apparatus (1 1), the electronic equipment (10) being characterized in that it comprises:
• des moyens de mesure de la tension (VGr,d ) dans le blindage (13) du câble (12) et, Means for measuring the voltage (V Gr , d ) in the shielding (13) of the cable (12) and,
• des moyens de génération d'une tension régulée (VBus ) à partir de la tension d'alimentation (VBus) et de la tension (VGnd ) dans le blindage (13) du câble (12). Means for generating a regulated voltage (V B us) from the supply voltage (V B us) and the voltage (V Gnd ) in the shield (13) of the cable (12).
2. Equipement électronique (10) selon la revendication 1 , dans lequel les moyens de mesure de la tension (VGnd ) dans le blindage (13) du câble (12) comportent une capacité (C) reliée à une masse (Gnd) de l'équipement électronique (10), le blindage (13) du câble (12) étant connecté à la masse (Gnd) de l'équipement électronique (10) par couplage capacitif. Electronic equipment (10) according to claim 1, wherein the means for measuring the voltage (V Gnd ) in the shield (13) of the cable (12) comprise a capacitor (C) connected to a ground (Gnd) of the electronic equipment (10), the shield (13) of the cable (12) being connected to ground (Gnd) of the electronic equipment (10) by capacitive coupling.
3. Equipement électronique (10) selon la revendication 2, dans lequel les moyens de mesure de la tension (VGnd ) dans le blindage (13) du câble (12) comportent en outre une résistance (R) placée en parallèle de la capacité (C). Electronic equipment (10) according to claim 2, wherein the means for measuring the voltage (V Gnd ) in the shield (13) of the cable (12) further comprise a resistor (R) placed in parallel with the capacitance (VS).
4. Equipement électronique (10) selon l'une des revendications précédentes, dans lequel les moyens de génération d'une tension régulée (VBus ) à partir de la tension d'alimentation (VBUs) et de la tension (VGr,d ) mesurée dans le blindage (13) du câble (12) comportent un amplificateur (A) délivrant une tension amplifié (VA) à partir de la tension (VGr,d ) mesurée dans le blindage (13) du câble (12). 4. Electronic equipment (10) according to one of the preceding claims, wherein the means for generating a regulated voltage (V B us) from the supply voltage (V BU s) and the voltage (V Gr , d ) measured in the shield (13) of the cable (12) comprise an amplifier (A) delivering an amplified voltage (V A ) from the voltage (V Gr , d ) measured in the shielding (13) of the cable (12).
5. Equipement électronique (10) selon la revendication 4, dans lequel les moyens de génération d'une tension régulée (VBus ) à partir de la tension d'alimentation (VBus) et de tension (VGnd ) mesurée dans le blindage (13) du câble (12) comportent un régulateur de tension (20) délivrant une tension régulée (VBus ) égale à la somme de la tension d'alimentation (VBus) et de la tension amplifiée (VA). 5. Electronic equipment (10) according to claim 4, wherein the means for generating a regulated voltage (V B us) from the supply voltage (V B us) and voltage (V G nd) measured in the shielding (13) of the cable (12) comprise a voltage regulator (20) delivering a regulated voltage (V B us) equal to the sum of the supply voltage (V B us) and the amplified voltage (V B us) A ).
6. Equipement électronique selon la revendication 5, dans lequel l'ensemble comprenant l'amplificateur (A) et le régulateur de tension (20) est réalisé par un unique composant intégré. 6. Electronic equipment according to claim 5, wherein the assembly comprising the amplifier (A) and the voltage regulator (20) is formed by a single integrated component.
7. Equipement électronique (10) selon l'une des revendications précédentes, comportant un premier connecteur Cr1 conforme à la norme USB. 7. Electronic equipment (10) according to one of the preceding claims, comprising a first connector Cr1 compliant with the USB standard.
8. Système d'alimentation en électricité comportant un équipement électronique (10) selon l'une des revendications précédentes et un câble (12) blindé apte à être branché sur ledit équipement électronique (10). 8. Electricity supply system comprising electronic equipment (10) according to one of the preceding claims and a shielded cable (12) adapted to be connected to said electronic equipment (10).
9. Véhicule comportant un équipement électronique (10) selon l'une des revendications 1 à 7 ou un système d'alimentation selon la revendication 8. 9. Vehicle comprising electronic equipment (10) according to one of claims 1 to 7 or a supply system according to claim 8.
PCT/FR2013/051911 2012-09-05 2013-08-08 Electronic device suitable for generating power supply voltage intended for supplying power to a mobile apparatus WO2014037642A1 (en)

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FR1258291A FR2995100B1 (en) 2012-09-05 2012-09-05 ELECTRONIC EQUIPMENT CAPABLE OF GENERATING A POWER SUPPLY VOLTAGE FOR FEEDING A NOMADIC APPARATUS
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