WO2008152466A2 - Insulation fault detection device - Google Patents

Insulation fault detection device Download PDF

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Publication number
WO2008152466A2
WO2008152466A2 PCT/IB2008/001451 IB2008001451W WO2008152466A2 WO 2008152466 A2 WO2008152466 A2 WO 2008152466A2 IB 2008001451 W IB2008001451 W IB 2008001451W WO 2008152466 A2 WO2008152466 A2 WO 2008152466A2
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WO
WIPO (PCT)
Prior art keywords
circuit
capacitor
primary
converter
voltage
Prior art date
Application number
PCT/IB2008/001451
Other languages
French (fr)
Other versions
WO2008152466A3 (en
Inventor
Michael Tihy
Stéphane FONTAINE
Original Assignee
Valeo Systemes De Controle Moteur
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 Valeo Systemes De Controle Moteur filed Critical Valeo Systemes De Controle Moteur
Publication of WO2008152466A2 publication Critical patent/WO2008152466A2/en
Publication of WO2008152466A3 publication Critical patent/WO2008152466A3/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/14—Measuring resistance by measuring current or voltage obtained from a reference source
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/62—Testing of transformers

Definitions

  • the present invention relates to devices for detecting insulation fault or galvanic isolation between two electronic circuits during operation, for example between the primary coil 1 and the secondary coil 2 of a transformer 3 of a voltage converter. 9, as shown in Figure 1.
  • Such devices are particularly necessary in converters voltage 12 volts / 230 volts used in the home automation of motor vehicles and, as such, they are subject to safety regulations whose standards EMC (electromagnetic compatibility) and holding at a voltage Vn equal in this case to 3750 volts.
  • the device 5 generally comprises a current generator between the primary and secondary circuits.
  • the device 5 is temporarily connected by a relay or an electronic switch 4, the time of measurement.
  • relay 4 When relay 4 is closed, the IF current is established and measurement 5 is performed.
  • the present invention relates to an isolation fault detection device of a voltage converter, the converter comprising a primary circuit and a secondary circuit, the device being characterized in that it comprises at least one capacitor connecting the primary and secondary circuits.
  • a capacitor capable of holding the voltage Vn of the above safety standard is both small and inexpensive.
  • the measure is always available and does not require a relay. Thanks to the capacitor, a measurement of the leakage current has been replaced by an impedance measurement, which varies in the event of insulation fault, that is to say, in the event of existence, between the primary and secondary circuits. secondary and in series with the detection capacitor, a non-infinite value fault resistance.
  • the device comprises a measuring bridge integrating two capacitors connected in series to connect the primary and secondary circuits of the capacitor.
  • the device comprises a frequency generator supplying the measurement bridge.
  • FIG. 1 is a simplified circuit diagram of a voltage converter circuit which is to test the galvanic isolation
  • FIG. 2 represents the circuit of FIG. 1 with a galvanic isolation detection device of the prior art
  • FIG. 3 is a circuit diagram of the galvanic isolation detection device of a voltage converter according to a first embodiment of the invention
  • FIG. 4 is an electrical diagram of the galvanic isolation detection device of the converter of Figure 3 according to a second embodiment of the invention.
  • the voltage converter 10 of FIG. 3 is intended to convert the input voltage Vp (here 12 volts) into an output voltage Vs (here 230 volts).
  • the converter 10 comprises a transformer 3 with its primary and secondary circuits 1, 2.
  • control circuit 7 On the primary circuit 1 is inserted a control circuit 7: a switching or chopping transistor, here an N-channel transistor.
  • a filtering or output stage 8 On the secondary circuit 2 is provided a filtering or output stage 8.
  • the switch of the prior art is replaced by a bridge 4 of capacitors CY, CA, connected in series, and able to hold the voltage Vn, so that the fault detection can be performed without danger of breakdown and in permanence during the operation of the converter as we will see.
  • a measuring circuit 5 and the capacitor bridge 4 constitute the isolation fault detection device of the converter 10.
  • the measuring circuit 5 comprises a frequency generator E delivering a current IE, at a predetermined frequency F in a load resistor RE and in the primary circuit of a galvanic isolation 6, so here a transformer, whose secondary circuit is connected across the capacitor CA.
  • the measurement is available by the voltage VE across the resistor RE. But in this first embodiment, there is arranged a comparator, here an operational amplifier 11 mounted as a comparator.
  • the comparator 11 is connected to the resistor RE by one of its two inputs and receives a reference voltage 12 on the other input and is thus arranged to permanently provide the difference D between this reference voltage 12 and the voltage V E existing across the resistor RE.
  • the leakage impedance ZF has a capacitive component CF, very low in front of CY and CA and can be neglected, and an RF resistive component.
  • the current IF is established at the resonance frequency Fr which essentially results from the value of the inductances presented by the transformer 6, as represented in FIG. 3, and the capacitances of the capacitors CY and CA.
  • This resonance frequency is therefore that of the circuit constituted by the transformer 6 and capacitors CY and CA of the measuring bridge.
  • the frequency Fr can be evaluated by applying the calculation methods known to those skilled in the art.
  • the generator E and the galvanic isolation 6 must necessarily be chosen to operate at a frequency F substantially equal to the frequency Fr, so as to obtain a better sensitivity.
  • the measuring circuit 5 comprises the generator E delivering the current IE at the frequency F in the resistor RE and in the primary circuit of the isolation 6, the secondary circuit is connected to the terminals of the capacitor CA, and a measurement stage 13 (also part of the circuit 5) for obtaining the peak value of the voltage across the capacitor CA and provide directly a voltage V E which takes into account the lack of isolation sought, directly usable by a microprocessor (not shown) after analog / digital conversion.
  • the capacitor CA when there is no insulation fault, the capacitor CA is charged by a known current. In case of a fault, part of the current is diverted on the capacitor CY and the voltage across the capacitor CA is reduced.
  • the insulation fault detection with respect to the maximum permissible threshold can be performed by comparing the insulation fault measurement with a predetermined reference value.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Measurement Of Resistance Or Impedance (AREA)

Abstract

The invention relates to a device (4, 5) for detecting insulation faults in a voltage converter (10), the converter (10) comprising a primary circuit (1) and a secondary circuit (2), the device being characterized in that it comprises at least one capacitor (CY, CA) linking the primary and secondary circuits (1, 2) of the converter. Thanks to the capacitor, a leakage current measurement has been replaced by a measurement of impedance, which varies in case of insulation faults; that is, in case of the existence, between the primary and secondary circuits and in series with the detection capacitor, in case of a fault resistance of non-infinite value.

Description

La présente invention concerne les dispositifs de détection de défaut d'isolation ou d'isolement galvanique entre deux circuits électroniques en cours de fonctionnement, par exemple entre la bobine primaire 1 et la bobine secondaire 2 d'un transformateur 3 d'un convertisseur en tension 9, comme il est montré en figure 1. The present invention relates to devices for detecting insulation fault or galvanic isolation between two electronic circuits during operation, for example between the primary coil 1 and the secondary coil 2 of a transformer 3 of a voltage converter. 9, as shown in Figure 1.
De tels dispositifs sont notamment nécessaires dans les convertisseurs en tension 12 Volts / 230 Volts utilisés dans la domotique embarquée des véhicules automobiles et, en tant que tels, ils sont soumis à des réglementations de sécurité dont les normes CEM (compatibilité électromagnétique) et la tenue à une tension Vn égale en l'espèce à 3750 Volts.Such devices are particularly necessary in converters voltage 12 volts / 230 volts used in the home automation of motor vehicles and, as such, they are subject to safety regulations whose standards EMC (electromagnetic compatibility) and holding at a voltage Vn equal in this case to 3750 volts.
Il est connu, en référence à la figure 2, de disposer, entre les circuits primaire et secondaire 1 , 2 du convertisseur 9, un dispositif 5 de mesure de la tension générée par le courant de fuite IF existant entre les bobines primaire et secondaire du transformateur 3. Le dispositif 5 comprend généralement un générateur de courant entre les circuits primaire et secondaire.It is known, with reference to FIG. 2, to have, between the primary and secondary circuits 1, 2 of the converter 9, a device 5 for measuring the voltage generated by the leakage current IF existing between the primary and secondary coils of the transformer 3. The device 5 generally comprises a current generator between the primary and secondary circuits.
Le dispositif 5 est temporairement connecté par un relais ou un interrupteur électronique 4, le temps de la mesure. Quand le relais 4 est fermé, le courant IF s'établit et la mesure 5 est effectuée.The device 5 is temporarily connected by a relay or an electronic switch 4, the time of measurement. When relay 4 is closed, the IF current is established and measurement 5 is performed.
Plutôt que de mettre un seul relais 4 capable de tenir la tension Vn, volumineux et coûteux, on préfère généralement insérer plusieurs relais en série.Rather than put a single relay 4 capable of holding voltage Vn, bulky and expensive, it is generally preferred to insert several relays in series.
Mais cette solution reste volumineuse et coûteuse. La demanderesse a cherché une solution plus économique et c'est ainsi qu'elle propose son invention.But this solution remains bulky and expensive. The plaintiff sought a more economical solution and that is how she proposes her invention.
Ainsi, la présente invention concerne un dispositif de détection de défaut d'isolement d'un convertisseur en tension, le convertisseur comportant un circuit primaire et un circuit secondaire, le dispositif étant caractérisé par le fait qu'il comporte au moins un condensateur reliant les circuits primaire et secondaire.Thus, the present invention relates to an isolation fault detection device of a voltage converter, the converter comprising a primary circuit and a secondary circuit, the device being characterized in that it comprises at least one capacitor connecting the primary and secondary circuits.
Un condensateur capable de tenir la tension Vn de la norme de sécurité ci-dessus est à la fois peu volumineux et peu coûteux. De plus, la mesure est disponible en permanence et elle ne nécessite pas de relais. Grâce au condensateur, on a substitué, à une mesure du courant de fuite, une mesure d'impédance, qui varie en cas de défaut d'isolement, c'est-à-dire en cas d'existence, entre les circuits primaire et secondaire et en série avec le condensateur de détection, d'une résistance de défaut de valeur non infinie.A capacitor capable of holding the voltage Vn of the above safety standard is both small and inexpensive. In addition, the measure is always available and does not require a relay. Thanks to the capacitor, a measurement of the leakage current has been replaced by an impedance measurement, which varies in the event of insulation fault, that is to say, in the event of existence, between the primary and secondary circuits. secondary and in series with the detection capacitor, a non-infinite value fault resistance.
De préférence, le dispositif comporte un pont de mesure intégrant deux condensateurs montés en série pour relier les circuits primaire et secondaire du condensateur.Preferably, the device comprises a measuring bridge integrating two capacitors connected in series to connect the primary and secondary circuits of the capacitor.
Avantageusement, le dispositif comporte un générateur de fréquence alimentant le pont de mesure.Advantageously, the device comprises a frequency generator supplying the measurement bridge.
D'autres caractéristiques et avantages de la présente invention apparaîtront plus clairement à la lecture de la description ci-après du dispositif de détection d'isolement galvanique d'un convertisseur en tension selon l'invention, faite en référence au dessin annexé sur lequelOther characteristics and advantages of the present invention will emerge more clearly on reading the following description of the galvanic isolation detection device of a voltage converter according to the invention, made with reference to the appended drawing in which:
- la figure 1 est un schéma électrique simplifié d'un circuit convertisseur en tension dont on veut tester l'isolement galvanique ;- Figure 1 is a simplified circuit diagram of a voltage converter circuit which is to test the galvanic isolation;
- la figure 2 représente le circuit de la figure 1 avec un dispositif de détection d'isolement galvanique de l'art antérieur ; - la figure 3 est un schéma électrique du dispositif de détection d'isolement galvanique d'un convertisseur en tension selon une première forme de réalisation de l'invention etFIG. 2 represents the circuit of FIG. 1 with a galvanic isolation detection device of the prior art; FIG. 3 is a circuit diagram of the galvanic isolation detection device of a voltage converter according to a first embodiment of the invention and
- la figure 4 est un schéma électrique du dispositif de détection d'isolement galvanique du convertisseur de la figure 3 selon une seconde forme de réalisation de l'invention.- Figure 4 is an electrical diagram of the galvanic isolation detection device of the converter of Figure 3 according to a second embodiment of the invention.
Le convertisseur en tension 10 de la figure 3 est destiné à convertir la tension Vp fournie en entrée (ici 12 volts) en une tension de sortie Vs (ici 230 volts).The voltage converter 10 of FIG. 3 is intended to convert the input voltage Vp (here 12 volts) into an output voltage Vs (here 230 volts).
Il s'agit en l'occurrence d'un convertisseur de la domotique embarquée à bord d'un véhicule automobile. Toutefois, la demanderesse n'entend pas limiter son invention à une telle application, les convertisseurs en tension étant montés dans bon nombre de circuits électroniques. Le convertisseur 10 comporte un transformateur 3 avec ses circuits primaire et secondaire 1 , 2.This is a home automation converter on board a motor vehicle. However, the applicant does not intend to limit its invention to such an application, voltage converters being mounted in many electronic circuits. The converter 10 comprises a transformer 3 with its primary and secondary circuits 1, 2.
Sur le circuit primaire 1 est inséré un circuit de commande 7 : un transistor de commutation ou de hachage, ici un transistor canal N. Sur le circuit secondaire 2 est prévu un étage de filtrage ou de sortie 8.On the primary circuit 1 is inserted a control circuit 7: a switching or chopping transistor, here an N-channel transistor. On the secondary circuit 2 is provided a filtering or output stage 8.
Ici, l'interrupteur de l'art antérieur est remplacé par un pont 4 de condensateurs CY, CA, reliés en série, et capable de tenir la tension Vn, de sorte que la détection de défaut peut être effectuée sans danger de claquage et en permanence pendant le fonctionnement du convertisseur comme on va le voir.Here, the switch of the prior art is replaced by a bridge 4 of capacitors CY, CA, connected in series, and able to hold the voltage Vn, so that the fault detection can be performed without danger of breakdown and in permanence during the operation of the converter as we will see.
Un circuit de mesure 5 et le pont de condensateurs 4 constituent le dispositif de détection de défaut d'isolement du convertisseur 10.A measuring circuit 5 and the capacitor bridge 4 constitute the isolation fault detection device of the converter 10.
Dans la première forme de réalisation de la figure 3 du dispositif de détection de défaut d'isolement 4, 5, le circuit de mesure 5 comporte un générateur de fréquence E débitant un courant IE, à une fréquence F prédéterminée dans une résistance de charge RE et dans le circuit primaire d'un isolement galvanique 6, donc ici un transformateur, dont le circuit secondaire est connecté aux bornes du condensateur CA.In the first embodiment of FIG. 3 of the insulation fault detection device 4, 5, the measuring circuit 5 comprises a frequency generator E delivering a current IE, at a predetermined frequency F in a load resistor RE and in the primary circuit of a galvanic isolation 6, so here a transformer, whose secondary circuit is connected across the capacitor CA.
La mesure est disponible par la tension VE aux bornes de la résistance RE. Mais dans cette première forme de réalisation, on a disposé un comparateur, ici un amplificateur opérationnel 11 monté en comparateur .The measurement is available by the voltage VE across the resistor RE. But in this first embodiment, there is arranged a comparator, here an operational amplifier 11 mounted as a comparator.
Le comparateur 11 est connecté à la résistance RE par l'une de ses deux entrées et reçoit une tension de référence 12 sur l'autre entrée et est ainsi agencé pour fournir en permanence la différence D entre cette tension de référence 12 et la tension VE existant aux bornes de la résistance RE.The comparator 11 is connected to the resistor RE by one of its two inputs and receives a reference voltage 12 on the other input and is thus arranged to permanently provide the difference D between this reference voltage 12 and the voltage V E existing across the resistor RE.
Quand un courant de fuite iF s'établit parce que la résistance RF n'est pas infinie, il traverse les condensateurs CY et CA et s'ajoute au courant IA dans le condensateur CA et Is dans le secondaire de l'isolement galvanique 6. Le courant IE dans la résistance RE augmente donc aussi, modifiant la tension VE. La caractérisation, ici par un microprocesseur non représenté, du signe de la sortie D de l'amplificateur 11 permet la détection de défaut d'isolement et le déclenchement d'une alerte si la tension VE dépasse la tension de référence 12. La tension VE constitue alors une donnée analogique permettant d'évaluer aisément en permanence la mesure du défaut d'isolement entre les circuits primaire et secondaire 1 , 2 du convertisseur 10, donc son importance.When a leakage current iF is established because the resistance R F is not infinite, it passes through the capacitors CY and CA and adds to the current I A in the capacitor CA and Is in the secondary of the galvanic isolation 6. The current IE in the resistor R E also increases, modifying the voltage V E. The characterization, here by a microprocessor not shown, of the sign of the output D of the amplifier 11 allows the detection of insulation fault and the triggering of an alarm if the voltage V E exceeds the reference voltage 12. The voltage VE is then an analog data to easily assess continuously the measurement of the insulation fault between the primary and secondary circuits 1, 2 of the converter 10, so its importance.
Plus précisément, l'impédance de fuite ZF comporte une composante capacitive CF, très faible devant CY et CA et que l'on peut négliger, et une composante résistive RF. Par suite, le courant IF s'établit à la fréquence de résonance Fr qui résulte essentiellement de la valeur des inductances présentées par le transformateur 6, comme représenté figure 3, et des capacités des condensateurs CY et CA. Cette fréquence de résonance est donc celle du circuit constitué par le transformateur 6 et des condensateurs CY et CA du pont de mesure.Specifically, the leakage impedance ZF has a capacitive component CF, very low in front of CY and CA and can be neglected, and an RF resistive component. As a result, the current IF is established at the resonance frequency Fr which essentially results from the value of the inductances presented by the transformer 6, as represented in FIG. 3, and the capacitances of the capacitors CY and CA. This resonance frequency is therefore that of the circuit constituted by the transformer 6 and capacitors CY and CA of the measuring bridge.
La fréquence Fr peut être évaluée en appliquant les méthodes de calcul connues de l'homme du métier.The frequency Fr can be evaluated by applying the calculation methods known to those skilled in the art.
Le générateur E et l'isolement galvanique 6 doivent nécessairement être choisis pour fonctionner à une fréquence F sensiblement égale la fréquence Fr, de façon à obtenir une meilleure sensibilité.The generator E and the galvanic isolation 6 must necessarily be chosen to operate at a frequency F substantially equal to the frequency Fr, so as to obtain a better sensitivity.
Dans la seconde forme de réalisation du dispositif de détection de défaut d'isolement de la figure 4, le circuit de mesure 5 comporte le générateur E débitant le courant IE à la fréquence F dans la résistance RE et dans le circuit primaire de l'isolement galvanique 6 dont le circuit secondaire est connecté aux bornes du condensateur CA, et d'un étage de mesure 13 (faisant également partie du circuit 5) permettant d'obtenir la valeur crête de la tension aux bornes du condensateur CA et d'en fournir directement une tension VE qui tient compte du au défaut d'isolement cherché, directement exploitable par un microprocesseur (non représenté) après conversion analogique / numérique.In the second embodiment of the insulation fault detection device of FIG. 4, the measuring circuit 5 comprises the generator E delivering the current IE at the frequency F in the resistor RE and in the primary circuit of the isolation 6, the secondary circuit is connected to the terminals of the capacitor CA, and a measurement stage 13 (also part of the circuit 5) for obtaining the peak value of the voltage across the capacitor CA and provide directly a voltage V E which takes into account the lack of isolation sought, directly usable by a microprocessor (not shown) after analog / digital conversion.
En effet, lorsqu'il n'y a pas de défaut d'isolement, le condensateur CA est chargé par un courant connu. En cas de défaut, une partie du courant est détournée sur le condensateur CY et la tension aux bornes du condensateur CA est réduite. Dans le microprocesseur, la détection de défaut d'isolement par rapport au seuil maximal admissible peut être effectuée par comparaison de la mesure de défaut d'isolement à une valeur de référence prédéterminée. Indeed, when there is no insulation fault, the capacitor CA is charged by a known current. In case of a fault, part of the current is diverted on the capacitor CY and the voltage across the capacitor CA is reduced. In the microprocessor, the insulation fault detection with respect to the maximum permissible threshold can be performed by comparing the insulation fault measurement with a predetermined reference value.

Claims

REVENDICATIONS
1- Dispositif (4, 5) de détection de défaut d'isolement d'un convertisseur en tension (10), le convertisseur (10) comportant un circuit primaire1- Device (4, 5) for detecting the insulation fault of a voltage converter (10), the converter (10) comprising a primary circuit
(1) et un circuit secondaire (2), le dispositif étant caractérisé par le fait qu'il comporte au moins un condensateur (CY, CA) reliant les circuits primaire et secondaire (1 , 2) du convertisseur.(1) and a secondary circuit (2), the device being characterized in that it comprises at least one capacitor (CY, CA) connecting the primary and secondary circuits (1, 2) of the converter.
2- Dispositif selon la revendication 1 , caractérisé par le fait qu'il comporte un pont de mesure (4) intégrant deux condensateurs (CY,2- Device according to claim 1, characterized in that it comprises a measuring bridge (4) incorporating two capacitors (CY,
CA) montés en série pour relier les circuits primaire et secondaire (1 ,CA) connected in series to connect the primary and secondary circuits (1,
2).2).
3- Dispositif selon l'une des revendications 1 et 2, caractérisé par le fait qu'il comporte un générateur E de fréquence F alimentant ledit pont de mesure (4).3- Device according to one of claims 1 and 2, characterized in that it comprises a generator E of frequency F feeding said measuring bridge (4).
4- Dispositif selon la revendication 3, caractérisé par le fait que ledit générateur E alimente un circuit comportant une résistance de charge4- Device according to claim 3, characterized in that said generator E feeds a circuit comprising a load resistor
RE-RE-
5- Dispositif selon la revendication 4, caractérisé par le fait que ledit circuit alimenté par le générateur E est isolé du pont de mesure (4) grâce à un isolement galvanique (6).5- Device according to claim 4, characterized in that said circuit supplied by the generator E is isolated from the measuring bridge (4) by galvanic isolation (6).
6- Dispositif selon la revendication 5, caractérisé par le fait que la détection de défaut d'isolement est effectuée sur la résistance de charge RE par un compensateur (11) 7- Dispositif selon l'une des revendications 2 à 5, caractérisé par le fait que la mesure de défaut d'isolement est effectuée sur au moins un condensateur CA du pont de mesure (4).6- Device according to claim 5, characterized in that the insulation fault detection is performed on the load resistor RE by a compensator (11) 7- Device according to one of claims 2 to 5, characterized by the the fact that the insulation fault measurement is performed on at least one AC capacitor of the measuring bridge (4).
8- Dispositif selon la revendication 7, caractérisé par le fait qu'il comporte un filtre redresseur (13) aux bornes dudit condensateur CA du pont de mesure (4).8- Device according to claim 7, characterized in that it comprises a rectifier filter (13) across said capacitor CA of the measuring bridge (4).
9- Dispositif selon l'une des revendications 3 à 8, caractérisé par le fait que la fréquence F du générateur E est sensiblement égale à la fréquence de résonance Fr du circuit constitué par le transformateur 6 et des condensateurs (CY, CA) du pont de mesure (4) 9- Device according to one of claims 3 to 8, characterized in that the frequency F of the generator E is substantially equal to the resonance frequency Fr of the circuit constituted by the transformer 6 and capacitors (CY, CA) of the measuring bridge (4)
PCT/IB2008/001451 2007-06-11 2008-06-06 Insulation fault detection device WO2008152466A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0704147A FR2917176B1 (en) 2007-06-11 2007-06-11 DEVICE FOR DETECTING THE ISOLATION FAULT OF A VOLTAGE CONVERTER
FR0704147 2007-06-11

Publications (2)

Publication Number Publication Date
WO2008152466A2 true WO2008152466A2 (en) 2008-12-18
WO2008152466A3 WO2008152466A3 (en) 2009-02-05

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2251702A1 (en) 2009-05-05 2010-11-17 SMA Solar Technology AG Cabling test device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5963410A (en) * 1995-08-02 1999-10-05 Matsushita Electric Industrial Co., Ltd. Insulation testing method and apparatus therefor

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5963410A (en) * 1995-08-02 1999-10-05 Matsushita Electric Industrial Co., Ltd. Insulation testing method and apparatus therefor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2251702A1 (en) 2009-05-05 2010-11-17 SMA Solar Technology AG Cabling test device
US8717038B2 (en) 2009-05-05 2014-05-06 Sma Solar Technology Ag Wiring testing device

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WO2008152466A3 (en) 2009-02-05
FR2917176A1 (en) 2008-12-12
FR2917176B1 (en) 2009-09-04

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