WO2022167986A1 - Device for conditioning the reading of a current sensor and assembly comprising the device - Google Patents

Device for conditioning the reading of a current sensor and assembly comprising the device Download PDF

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Publication number
WO2022167986A1
WO2022167986A1 PCT/IB2022/050977 IB2022050977W WO2022167986A1 WO 2022167986 A1 WO2022167986 A1 WO 2022167986A1 IB 2022050977 W IB2022050977 W IB 2022050977W WO 2022167986 A1 WO2022167986 A1 WO 2022167986A1
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WO
WIPO (PCT)
Prior art keywords
current
core
reading
winding
current sensor
Prior art date
Application number
PCT/IB2022/050977
Other languages
French (fr)
Inventor
Cristiano Griletti
Original Assignee
Cartender Srl
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
Priority claimed from IT102021000002417A external-priority patent/IT202100002417A1/en
Application filed by Cartender Srl filed Critical Cartender Srl
Publication of WO2022167986A1 publication Critical patent/WO2022167986A1/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
    • G01R15/183—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using transformers with a magnetic core
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
    • G01R15/183—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using transformers with a magnetic core
    • G01R15/185—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using transformers with a magnetic core with compensation or feedback windings or interacting coils, e.g. 0-flux sensors

Definitions

  • the present invention finds application in the field of electrical devices and particularly it has as object a device for conditioning the reading of a current sensor, mainly adapted to be applied to current transformers.
  • the invention also relates with an assembly comprising a current sensor associated with the above conditioning device.
  • BESS household battery energy storage systems
  • the object of these systems is to allow the accumulation of energy produced in excess by a renewable energy source, typically but not exclusively of the photovoltaic type, to avoid the supply of this energy into the electricity grid, making it available later as an alternative to the withdrawal of energy from the electricity grid.
  • a typical example of a household system provided with an energy storage system is shown in Fig. 1, wherein the storage system 1 is connected to the electrical system of a user 2, for example a house, wherein a photovoltaic system 3, or other system for the production of electricity from renewable sources, is installed.
  • the storage system uses a current transformer TA 4 to measure the energy supplied into or withdrawn from the supplying electrical grid 5.
  • the storage system will intervene, within the construction limits, to keep the energy value measured by the current transformer 4 close to zero.
  • the storage system 1 will try to use energy equal to the value read from the current transformer 4 to charge the accumulator 6 thereinside.
  • the storage system 1 will supply the system with the energy stored in the accumulator 6 to balance the read value.
  • the automatic operation of the storage system is sufficient to cover the needs of a typical domestic user.
  • the accumulation systems on the market do not offer the possibility of modifying or regulating their operation in addition to activation or deactivation.
  • the user must intervene manually to enable or disable the storage system, having an on/off and non-modulated control.
  • the known systems are not optimally suited for use where the addition of a large energy consumer is provided such as, for example, but not exclusively, an electric battery vehicle, which can lead to different needs with respect to the management of the energy stored by the storage system.
  • US2015022153 discloses a device for detecting a leakage current designed to be positioned on board of a vehicle to measure a current from an electrical circuit of a vehicle by means of suitable measuring means which comprise a magnetic core designed to be crossed by one or more conductive elements wherein the current coming from the electric circuit flows.
  • the conductive elements form a primary winding and a secondary winding wound around the core to generate a magnetic flux from a reference current.
  • An oscillator generates the reference current through the secondary winding, the reference current being configured to saturate the core.
  • US2004204875 discloses a current sensor that uses the compensation principle, in particular for the measurement of direct and alternating currents and which comprises a fully digital evaluation circuit for signal processing.
  • the object of the present invention is to overcome the above drawbacks, providing a device for conditioning the reading of a current sensor adapted to be applied to electrical energy storage and management systems which is characterized by particular efficiency and relative cost-effectiveness.
  • a particular object is to provide a conditioning device for the reading of a current sensor that may be coupled in a relatively simple and fast manner to a current sensor integrated within an electrical energy storage and management system.
  • a particular object is to provide a device for conditioning the reading of a current sensor which is highly compatible with known current sensors, in particular with current transformers, to guarantee a wide range of use.
  • a particular object is to provide such a device which allows optimized management of an electrical energy storage and management system even in the presence of machines or apparatuses characterized by high energy consumption, such as for example electric vehicles.
  • Still another object is to provide such a device which is generally suitable to be applied to any storage system to condition the operation thereof by implementing stored energy management logics other than those provided by the system manufacturer.
  • a device for conditioning the reading of a current sensor according with claim 1, to which reference should be made for greater conciseness of the explanation.
  • the so designed device will allow to modify the current values read by the energy storage system to condition the behavior of the sensor to which it is applied and consequently of the energy management and storage system to which the sensor is connected to make it work also in a way different from how it is programmed, and to adapt it to specific needs, in particular in the presence of loads with high energy absorption such as, by way of example, an electric vehicle.
  • Fig- 1 is a schematic view of an electrical energy storage system according to the known art
  • Fig. 2 is a view of a device according to the invention in a first embodiment and associated with a current transformer;
  • Fig. 3 is a view of a device according to the invention in a second embodiment and associated with a current transformer;
  • Fig- 4 is a block diagram that describes the preferred implementation of the invention.
  • conditioning device for a current sensor according to the invention.
  • the assembly defined by the conditioning device and the sensor associated therewith will be particularly suitable for application to systems for the management and storage of electricity.
  • the system suitable for receiving this device will be designed to be connected to electrical systems for household use which, in addition to being connected to the normal electricity distribution grids, are also provided with one or more auxiliary systems for the production of electricity from renewable sources, such as, by way of example, photovoltaic, micro-wind and microhydric systems connected to the electrical system.
  • auxiliary systems for the production of electricity from renewable sources such as, by way of example, photovoltaic, micro-wind and microhydric systems connected to the electrical system.
  • the management and storage system will be designed to manage the energy produced by the auxiliary systems to accumulate it in special storage devices, usually batteries, or make it immediately available or, again, feed it into the grid.
  • a first configuration of the assembly which essentially comprises a current sensor, preferably a current transformer indicated globally with 100, having a core 101, a primary winding 104 adapted to be connected to an electrical grid for the flowing of electric current and the generation of a variable magnetic flux in the core 101 and a secondary winding 102 wound around the core 101 for sensing the current or voltage induced by the magnetic flux.
  • a current sensor preferably a current transformer indicated globally with 100
  • a primary winding 104 adapted to be connected to an electrical grid for the flowing of electric current and the generation of a variable magnetic flux in the core 101 and a secondary winding 102 wound around the core 101 for sensing the current or voltage induced by the magnetic flux.
  • the primary winding 104 will consist of an electric cable through which the alternating current to be measured flows.
  • the second winding 102 is in turn connected to a reading device 103 of the induced current or voltage and which will be connected to the control unit of the electrical energy storage system, which will behave consistently with the modalities in which it was programmed.
  • the conditioning device will be composed of an additional winding 105 adapted to be placed around the core 101 and a control circuit 106 connected to the additional winding 105 and which will be designed to send current into the additional winding 105 so as to modify the magnetic flux in the core 101 and alter the value measured by the secondary winding 102.
  • the additional winding 105 may be connected to the control circuit 106 directly or via a cable.
  • This cable will represent a primary winding for the current transformer 100 provided with the core 101 and the secondary winding 102.
  • the magnetic field generated by the additional winding 105 will be algebraically added to that generated by the primary winding 104.
  • the resulting variable magnetic field will be conveyed by the core 101 and transformed into a variable current by the secondary winding 102.
  • This modification of the traditional current transformer 100 will allow to condition the reading of the current measured by the reading device 103 to control the management and storage system and to have a distribution of the electricity produced by the plant with renewable sources that is optimized with respect to the needs of the moment.
  • the additional winding 105 consists of a single wire turn while in the configuration of Fig. 2 there is an additional winding 107 comprising a plurality of wire turns, as more clearly visible from the enlarged detail.
  • This last embodiment allows to use proportionally lower currents as the number of turns increases, reducing the cost and energy consumption of the assembly, but can only be applied to split-core current transformers.
  • the additional winding 105, 107 may include a protective ring wherein the wire turns are enclosed.
  • the protective ring will be made of plastic material of adequate strength.
  • the control circuit 106 will be suitably provided with an interface for controlling the values to be conditioned, either remotely or locally.
  • the interface will be digital and wired.
  • the system may also be applied to three-phase systems using three additional windings, with one and/or more wire turns, connected to the relative cores to be conditioned and which can be synchronized by a main control circuit.
  • each additional winding may be associated with a respective control circuit which, in turn, will be connected to a central management system which will receive the measurements of the three control circuits.
  • Fig- 4 shows the block diagram of the system as a whole.
  • the winding 202 corresponding to the additional winding 105, 107 of the previous figures, is driven in current by the signal produced by the sine wave generator 206 through an amplifier 204.
  • This generator 206 may optionally receive feedback 209 to form a closed loop control system so to improve accuracy.
  • the sine wave generator 206 receives a synchronization signal with the power supply sinusoid coming from the grid 208 through the block 203 which may be constituted, by way of example, of a resistive attenuator, a transformer or a zero crossing detection circuit.
  • this signal may be deduced from the feedback circuit 209 or sent by the main control block 205.
  • the control block 205 carries out the control and coordination function of the system, mainly controlling the features of the waveform generated by the sine generator 206, mainly but not exclusively amplitude and phase, to define the values that it is desired to be read from the system to be conditioned.
  • control block 205 will allow to vary not only the amplitude of current, which would allow to simulate only a purely resistive load, but also the phase shift of the sinusoid, so as to shift the power value read on the four quadrants and also simulate inductive and capacitive loads, or an “injection into the grid”, ie a negative power.
  • the control block 205 may be programmed to read the features of the current flowing along the cable 210 that is object of the measure by the current transformer 4 and to control identical but opposite features to the sine wave generator 206 in order to reset the current perceived by the transformer 4.
  • control block 205 could receive commands from an external device 207, preferably but not exclusively via a wired or wireless digital channel, in order to choose arbitrary values for the production of the waveform.
  • the information collected by one or more inputs of the control block 205 may be sent, by way of example, to the external device 207, or to any other devices present on the same bus/network.
  • the operating modes may be selected preferably but not exclusively by means of digital commands or digital inputs of the on/off type.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

An assembly for conditioning the reading of a current sensor comprises a current sensor (100) having a core (101), a primary winding (104) adapted to be connected to an electrical grid for the flowing of current and the generation of a variable magnetic flux in said core (101) and a secondary winding (102) wound around said core (101) for detecting the current or voltage induced by said magnetic flux, reading means (103) of the induced current adapted to be connected to an electrical energy storage and management system, at least one additional winding (105, 107) placed around said core (101) and associated with a control circuit (106) to alter the current value measured by said secondary winding (102) to condition the reading of the current or tension measured by said reading means (103).

Description

DEVICE FOR CONDITIONING THE READING OF A CURRENT SENSOR AND ASSEMBLY COMPRISING THE DEVICE
Description
Technical Field
The present invention finds application in the field of electrical devices and particularly it has as object a device for conditioning the reading of a current sensor, mainly adapted to be applied to current transformers. The invention also relates with an assembly comprising a current sensor associated with the above conditioning device.
State of the art
As known, household battery energy storage systems (BESS) are systems designed to allow the management and storage of electricity produced from renewable sources, usually but not necessarily through the use of specially developed batteries, in order to balance energy production and consumption.
In particular, the object of these systems is to allow the accumulation of energy produced in excess by a renewable energy source, typically but not exclusively of the photovoltaic type, to avoid the supply of this energy into the electricity grid, making it available later as an alternative to the withdrawal of energy from the electricity grid. A typical example of a household system provided with an energy storage system is shown in Fig. 1, wherein the storage system 1 is connected to the electrical system of a user 2, for example a house, wherein a photovoltaic system 3, or other system for the production of electricity from renewable sources, is installed.
The storage system uses a current transformer TA 4 to measure the energy supplied into or withdrawn from the supplying electrical grid 5.
Typically, the storage system will intervene, within the construction limits, to keep the energy value measured by the current transformer 4 close to zero.
In particular, if the current transformer 4 reads a positive value, which is index of a surplus of energy produced by the system 3 not consumed by the user 2 and therefore supplied into the grid 5, the storage system 1 will try to use energy equal to the value read from the current transformer 4 to charge the accumulator 6 thereinside.
If the current transformer 4 reads a negative value, which is index of a domestic consumption greater than the photovoltaic production and therefore of a withdrawal of energy from the grid 5, the storage system 1 will supply the system with the energy stored in the accumulator 6 to balance the read value.
Typically, the automatic operation of the storage system is sufficient to cover the needs of a typical domestic user.
However, the addition of a large energy consumer such as, for example but not exclusively, an electric battery vehicle, may lead to different needs with respect to the management of the energy stored by the storage system.
As an example, there may be the following needs:
- if photovoltaic production is in excess, it could be possible to charge the vehicle battery first and, once a certain range has been reached, charge the accumulator of the storage system;
- if photovoltaic production is in excess, it could possible to charge first the accumulator of the storage system and, once a certain capacity has been reached, for example such as to meet the needs of night-time energy consumption of the home, charge the vehicle battery;
- if there is a withdrawal of energy from the storage system due to insufficient production of the photovoltaic system or other renewable energy system, or to excessive consumption of the home, it is possible to not use the stored energy to charge the vehicle.
At the state of the art, the accumulation systems on the market do not offer the possibility of modifying or regulating their operation in addition to activation or deactivation. The user must intervene manually to enable or disable the storage system, having an on/off and non-modulated control.
Even when the storage system can be activated or deactivated via software controls, the procedure is not suitable to be used frequently and generally has a substantial intervention time, even of several minutes, necessary for the storage system, once activated, to returns to normal operation.
It is also possible to install the current transformer 4 upstream or downstream of the connection of the recharging system to exclude or comprise this load from the calculation of the storage system.
However, this operation is binding and not easily/quickly reversible, as the TA 4 must be physically moved, to select one or the other option, by qualified personnel who should also report the modification of the system in the relative certification documents thereof.
Alternatively, it is possible to install a TA upstream and one downstream of the recharging system and select which of them to be connected to the storage system using a selector, or to intervene directly on the TA wiring to modify its reading, but these operations are not included in the design of the storage system and could invalidate the warranty or cause serious damage.
Furthermore, by intervening directly on the TA wiring, it is difficult to create a conditioning system compatible with the various battery systems on the market as the reading circuit differs between the various models.
Therefore, the known systems are not optimally suited for use where the addition of a large energy consumer is provided such as, for example, but not exclusively, an electric battery vehicle, which can lead to different needs with respect to the management of the energy stored by the storage system.
On the contrary, in such systems it is not possible to condition their operation to implement stored energy management logics that are different from those provided by the manufacturer.
US2015022153 discloses a device for detecting a leakage current designed to be positioned on board of a vehicle to measure a current from an electrical circuit of a vehicle by means of suitable measuring means which comprise a magnetic core designed to be crossed by one or more conductive elements wherein the current coming from the electric circuit flows.
The conductive elements form a primary winding and a secondary winding wound around the core to generate a magnetic flux from a reference current. An oscillator generates the reference current through the secondary winding, the reference current being configured to saturate the core.
US2004204875 discloses a current sensor that uses the compensation principle, in particular for the measurement of direct and alternating currents and which comprises a fully digital evaluation circuit for signal processing.
Scope of the invention
The object of the present invention is to overcome the above drawbacks, providing a device for conditioning the reading of a current sensor adapted to be applied to electrical energy storage and management systems which is characterized by particular efficiency and relative cost-effectiveness.
A particular object is to provide a conditioning device for the reading of a current sensor that may be coupled in a relatively simple and fast manner to a current sensor integrated within an electrical energy storage and management system.
A particular object is to provide a device for conditioning the reading of a current sensor which is highly compatible with known current sensors, in particular with current transformers, to guarantee a wide range of use.
A particular object is to provide such a device which allows optimized management of an electrical energy storage and management system even in the presence of machines or apparatuses characterized by high energy consumption, such as for example electric vehicles.
Still another object is to provide such a device which is generally suitable to be applied to any storage system to condition the operation thereof by implementing stored energy management logics other than those provided by the system manufacturer.
These objects, as well as others that will become more apparent hereinafter, are achieved by a device for conditioning the reading of a current sensor according with claim 1, to which reference should be made for greater conciseness of the explanation. The so designed device will allow to modify the current values read by the energy storage system to condition the behavior of the sensor to which it is applied and consequently of the energy management and storage system to which the sensor is connected to make it work also in a way different from how it is programmed, and to adapt it to specific needs, in particular in the presence of loads with high energy absorption such as, by way of example, an electric vehicle.
Advantageous embodiments of the invention are obtained in accordance with the dependent claims.
Brief disclosure of the drawings
Further features and advantages of the invention will become more apparent in the light of the detailed description of a preferred but not exclusive embodiment of a sensor provided with the device according to the invention and of the system associated therewith, shown by way of non-limiting example with the aid of the attached drawing tables wherein: Fig- 1 is a schematic view of an electrical energy storage system according to the known art;
Fig. 2 is a view of a device according to the invention in a first embodiment and associated with a current transformer;
Fig. 3 is a view of a device according to the invention in a second embodiment and associated with a current transformer;
Fig- 4 is a block diagram that describes the preferred implementation of the invention.
Best modes of carrying out the invention
With reference to the attached figures, two preferred but not exclusive embodiments of a conditioning device for a current sensor according to the invention are illustrated. The assembly defined by the conditioning device and the sensor associated therewith will be particularly suitable for application to systems for the management and storage of electricity.
In particular, the system suitable for receiving this device will be designed to be connected to electrical systems for household use which, in addition to being connected to the normal electricity distribution grids, are also provided with one or more auxiliary systems for the production of electricity from renewable sources, such as, by way of example, photovoltaic, micro-wind and microhydric systems connected to the electrical system.
In particular, the management and storage system will be designed to manage the energy produced by the auxiliary systems to accumulate it in special storage devices, usually batteries, or make it immediately available or, again, feed it into the grid.
In Fig. 2 a first configuration of the assembly is illustrated which essentially comprises a current sensor, preferably a current transformer indicated globally with 100, having a core 101, a primary winding 104 adapted to be connected to an electrical grid for the flowing of electric current and the generation of a variable magnetic flux in the core 101 and a secondary winding 102 wound around the core 101 for sensing the current or voltage induced by the magnetic flux.
The primary winding 104 will consist of an electric cable through which the alternating current to be measured flows.
The second winding 102 is in turn connected to a reading device 103 of the induced current or voltage and which will be connected to the control unit of the electrical energy storage system, which will behave consistently with the modalities in which it was programmed.
In a peculiar way, the conditioning device according to the invention will be composed of an additional winding 105 adapted to be placed around the core 101 and a control circuit 106 connected to the additional winding 105 and which will be designed to send current into the additional winding 105 so as to modify the magnetic flux in the core 101 and alter the value measured by the secondary winding 102.
The additional winding 105 may be connected to the control circuit 106 directly or via a cable. This cable will represent a primary winding for the current transformer 100 provided with the core 101 and the secondary winding 102.
In this way, the magnetic field generated by the additional winding 105 will be algebraically added to that generated by the primary winding 104. The resulting variable magnetic field will be conveyed by the core 101 and transformed into a variable current by the secondary winding 102.
This modification of the traditional current transformer 100 will allow to condition the reading of the current measured by the reading device 103 to control the management and storage system and to have a distribution of the electricity produced by the plant with renewable sources that is optimized with respect to the needs of the moment.
In the first shown embodiment, the additional winding 105 consists of a single wire turn while in the configuration of Fig. 2 there is an additional winding 107 comprising a plurality of wire turns, as more clearly visible from the enlarged detail.
This last embodiment allows to use proportionally lower currents as the number of turns increases, reducing the cost and energy consumption of the assembly, but can only be applied to split-core current transformers.
In both cases, the additional winding 105, 107 may include a protective ring wherein the wire turns are enclosed. Preferably, the protective ring will be made of plastic material of adequate strength.
The control circuit 106 will be suitably provided with an interface for controlling the values to be conditioned, either remotely or locally.
To this end, preferably but not exclusively, the interface will be digital and wired.
The system may also be applied to three-phase systems using three additional windings, with one and/or more wire turns, connected to the relative cores to be conditioned and which can be synchronized by a main control circuit.
Alternatively, each additional winding may be associated with a respective control circuit which, in turn, will be connected to a central management system which will receive the measurements of the three control circuits.
Fig- 4 shows the block diagram of the system as a whole.
In particular, the winding 202, corresponding to the additional winding 105, 107 of the previous figures, is driven in current by the signal produced by the sine wave generator 206 through an amplifier 204.
This generator 206 may optionally receive feedback 209 to form a closed loop control system so to improve accuracy.
The sine wave generator 206 receives a synchronization signal with the power supply sinusoid coming from the grid 208 through the block 203 which may be constituted, by way of example, of a resistive attenuator, a transformer or a zero crossing detection circuit.
Alternatively, this signal may be deduced from the feedback circuit 209 or sent by the main control block 205.
The control block 205 carries out the control and coordination function of the system, mainly controlling the features of the waveform generated by the sine generator 206, mainly but not exclusively amplitude and phase, to define the values that it is desired to be read from the system to be conditioned.
In summary, the control block 205 will allow to vary not only the amplitude of current, which would allow to simulate only a purely resistive load, but also the phase shift of the sinusoid, so as to shift the power value read on the four quadrants and also simulate inductive and capacitive loads, or an “injection into the grid”, ie a negative power. According to a further operating mode, the control block 205 may be programmed to read the features of the current flowing along the cable 210 that is object of the measure by the current transformer 4 and to control identical but opposite features to the sine wave generator 206 in order to reset the current perceived by the transformer 4.
In another operating mode, the control block 205 could receive commands from an external device 207, preferably but not exclusively via a wired or wireless digital channel, in order to choose arbitrary values for the production of the waveform.
The information collected by one or more inputs of the control block 205, such as by way of example current and/or phase shift of the load from the block 201, voltage and/or synchronization from synchronization block 203, feedback circuit 209, may be sent, by way of example, to the external device 207, or to any other devices present on the same bus/network. The operating modes may be selected preferably but not exclusively by means of digital commands or digital inputs of the on/off type.
From above it is clear that the apparatus according to the present invention achieves the intended objects.

Claims

9 Claims
1. A device for conditioning the reading of a current sensor, wherein a current sensor (100) comprises a core (101), a primary winding (104) adapted to be connected to an electrical grid for the flowing of current and the generation of a variable magnetic flux in said core (101), a secondary winding (102) wound around said core (101) for detecting the current or voltage induced by said magnetic flux and a reading device (103) of said induced current adapted to be connected to an electrical energy storage and management system, which device is characterized by comprising at least one additional winding (105, 107) adapted to be placed around said core (101) and a control circuit (106) connected to said additional winding (105, 107) to alter the current value measured by said secondary winding (102) and to condition the reading of the current measured by said reading device (103).
2. Device as claimed in claim 1, characterized in that said additional winding (105) consists of a single wire turn.
3. Device as claimed in claim 1, characterized in that said additional winding (107) comprises a plurality of wire turns.
4. Device as claimed in claim 2 or 3, characterized in that said one or more wire turns are enclosed in a protective ring made of plastic material.
5. Device as claimed in any preceding claim, characterized in that said control circuit (106) is provided with an interface for controlling the values to be conditioned.
6. Device as claimed in claim 5, characterized in that said interface is digital and wired.
7. Device as claimed in any preceding claim, characterized in that said control circuit (106) comprises a sine wave generator (206) adapted to generate a current driving signal of said additional winding (105, 107).
8. Device as claimed in claim 7, characterized in that said sine wave generator (206) is adapted to receive a synchronization signal with the power supply sinusoid coming from the grid (208) through a synchronization block (203).
9. Device as claimed in claim 8, characterized by comprising a control block (205) adapted to control the features of the waveform generated by said sine wave generator (6) by varying the amplitude of the current and the phase shift of the sinusoid, to define the values to be read by the system to be conditioned.
10. Device as claimed in any preceding claim, associable with three-phase systems, characterized by comprising three of said additional windings adapted to be wound around the same core and connected to the same control circuit.
11. Device as claimed in any claim 1 to 6, suitable to be associated with three-phase systems, characterized by comprising three of said additional windings wound around the same core and connected to respective control circuits connected to a central management system suitable for receive the respective measures.
12. A current sensor reading conditioning assembly, comprising: a current sensor (100) having a core (101), a primary winding (104) adapted to be connected to an electric grid for the flowing of electric current and the generation of a variable magnetic flux in said core (101), a secondary winding (102) wound around said core (101) for sensing the current or voltage induced by said magnetic flux; a reading device (103) connected to said secondary winding for reading said induced current and adapted to be connected to an electrical energy storage and management system; a device for conditioning the reading of the current by said current sensor (100); characterized in that said conditioning device comprises at least one additional winding (105, 107) adapted to be placed around said core (101) and a control circuit (106) connected to said additional winding (105, 107) to alter the current value measured by said secondary winding (102) and to condition the reading of the current measured by said reading device (103).
13. Assembly as claimed in claim 12, characterized in that said current sensor (100) is a current transformer.
PCT/IB2022/050977 2021-02-04 2022-02-04 Device for conditioning the reading of a current sensor and assembly comprising the device WO2022167986A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
IT102021000002417 2021-02-04
IT102021000002417A IT202100002417A1 (en) 2021-02-04 2021-02-04 APPARATUS FOR CONDITIONING THE READING OF A CURRENT SENSOR
IT102021000011414 2021-05-05
IT202100011414 2021-05-05

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040204875A1 (en) * 2000-09-13 2004-10-14 Siemens Aktiengesellschaft Evaluation circuit for a current sensor using the compensation principle, in particular for measuring direct and alternating currents, and a method for operating such a current sensor
US20150022153A1 (en) * 2012-02-29 2015-01-22 Valeo Systemes De Controle Moteur Detection of a leakage current comprising a continuous component in a vehicle

Patent Citations (2)

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US20150022153A1 (en) * 2012-02-29 2015-01-22 Valeo Systemes De Controle Moteur Detection of a leakage current comprising a continuous component in a vehicle

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