WO2013137253A1 - 電流センサ、センサ素子および制御装置 - Google Patents

電流センサ、センサ素子および制御装置 Download PDF

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Publication number
WO2013137253A1
WO2013137253A1 PCT/JP2013/056812 JP2013056812W WO2013137253A1 WO 2013137253 A1 WO2013137253 A1 WO 2013137253A1 JP 2013056812 W JP2013056812 W JP 2013056812W WO 2013137253 A1 WO2013137253 A1 WO 2013137253A1
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Prior art keywords
signal
coil
detection
cancel
component
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Ceased
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PCT/JP2013/056812
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English (en)
French (fr)
Japanese (ja)
Inventor
貴幸 八田
泰丈 廣田
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Ferrotec Material Technologies Corp
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Ferrotec Corp
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Application filed by Ferrotec Corp filed Critical Ferrotec Corp
Priority to KR1020147028391A priority Critical patent/KR101616854B1/ko
Priority to HK15105315.0A priority patent/HK1204806A1/en
Priority to US14/384,712 priority patent/US9448262B2/en
Priority to CN201380014063.6A priority patent/CN104169727B/zh
Priority to EP13760825.3A priority patent/EP2840400A4/en
Publication of WO2013137253A1 publication Critical patent/WO2013137253A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux

Definitions

  • the present invention relates to a current sensor that detects a current flowing through a detected electric wire.
  • the signal level detected on the detection coil side that receives the excitation signal is the signal level of the detected current that penetrates the annular region of the core member. Therefore, it is common to specify (detect) the detected current based on the change (see Patent Document 1).
  • the current sensor having the above configuration saturates the core member to the vicinity of the saturation magnetization density Bs by the detected current, thereby distorting the magnetic flux B generated as a sine wave by the excitation signal and applying a signal level corresponding to the change. Since the detection current signal level is specified, only a narrow current range corresponding to the vicinity of the saturation magnetization density Bs can be detected.
  • 1st aspect of this invention is a current sensor containing a sensor element and a detection part, Comprising:
  • the said sensor element forms the magnetic material in cyclic
  • annular form The magnetic permeability ⁇ decreases with the external magnetic field 0 as the apex according to the external magnetic field that changes due to the influence of the signal, and the change in the magnetic permeability ⁇ is plotted in the “coordinate system defined by the external magnetic field ⁇ permeability ⁇ ”.
  • the detection unit extracts, from the output signal of the detection coil, a component extraction unit that extracts a harmonic component superimposed on the fundamental wave component from signal components included in the output signal, and the output signal Corresponding to the harmonic component extracted by the component extraction unit, based on the correspondence relationship in which the harmonic component that can be included and the signal level of the detected signal when the harmonic component is generated are associated with each other
  • a level specifying unit that specifies the signal level as the signal level of the detected signal at that time; and an information output unit that outputs information indicating the signal level specified by the level specifying unit to the outside.
  • a magnetic flux corresponding to the signal level of the signal to be detected is superimposed on the core member.
  • the curvature of the ⁇ -H curve defined by the external magnetic field H and the magnetic permeability ⁇ increases according to the magnitude of the absolute value in the external magnetic field H.
  • the ⁇ -H coordinate is along the x-axis at an arbitrary position on the quadratic curve.
  • the harmonic component corresponding to the “bending” of the quadratic curve is superimposed on the output signal from the detection coil whose amplitude changes along the y-axis.
  • the electric wire is connected to the core member in order to improve the signal level of the detected current.
  • the current sensor can be simplified and downsized, its application is wide.
  • the specific configuration for extracting the harmonic component from the detection signal is not particularly limited.
  • the core member includes first and second core members disposed along a direction penetrating the detection region
  • the exciting coil includes the first and second core members. Two wound around each of the two core members are connected in series, and the number of windings and the positional relationship are determined so that the signal flowing in one and the signal flowing in the other have opposite phase and the same signal level.
  • the detection coil is wound so that the two wound around the first and second core members are connected in series, and the signal flowing in one and the signal flowing in the other have the same phase and the same signal level. The number of times and the positional relationship are determined.
  • the component extraction unit extracts the output signal itself from the detection coils connected in series as the harmonic component.
  • each excitation coil is connected in series with opposite phases, and each detection coil is connected in series with the same phase. Therefore, a fundamental wave component (an AC signal such as a sine wave) that regularly increases or decreases from the magnetic flux generated by the excitation signal. Component, the same applies below), while harmonic components that increase or decrease irregularly as distortion are emphasized and output.
  • a fundamental wave component an AC signal such as a sine wave
  • the core member includes first and second core members arranged along a direction penetrating the detection region, and the excitation coil includes the first coil. , The number of windings and the positional relationship are determined so that the two wound around each of the second core members are connected in series, and the signal flowing in one and the signal flowing in the other have the opposite phase and the same signal level.
  • the detection coil is a single coil wound around the first and second core members.
  • the component extraction unit extracts the output signal itself from the detection coil as the harmonic component.
  • the exciting coils are connected in series with opposite phases, and the detection coil is wound around the first and second core members with the core including the first and second core members as one core member.
  • the fundamental wave component that regularly increases and decreases from the magnetic flux generated by the excitation signal is canceled out, while the harmonic component that irregularly increases and decreases as distortion is emphasized and output.
  • the sensor element is provided with a displacement generation unit that generates a displacement signal obtained by shifting the phase of the output signal by 1 ⁇ 2 period based on the output signal of the detection coil.
  • the component extraction unit extracts a signal obtained by superimposing the output signal from the detection coil and the displacement signal generated by the displacement generation unit as the harmonic component.
  • the signal in which the harmonic component is emphasized can be extracted, and the signal level of the detected signal can be specified therefrom.
  • the harmonic component since the harmonic component is emphasized and outputted, the correspondence between the harmonic component and the signal level of the detected signal is based on the emphasized harmonic component. Will be prepared.
  • the magnetic permeability ⁇ in the core member may fluctuate not only due to the influence of the external magnetic field but also due to the influence of the temperature environment. Therefore, it is desirable to suppress the unintended fluctuation of the harmonic component accompanying the fluctuation of the magnetic permeability and to make it less susceptible to the influence of the temperature environment in order to increase the accuracy as the current sensor in this configuration.
  • the sensor element includes a cancel coil wound around the core member and energized with a cancel signal for canceling a change in the external magnetic field due to the influence of the detected signal.
  • the harmonic component superimposed on the output signal from the detection coil is changed by changing the external magnetic field due to the influence of the cancel signal supplied to the cancel coil.
  • the said detection part is provided with the cancellation control part which controls electricity supply of the cancellation signal to the said cancellation coil
  • the said cancellation control part is such that the harmonic component extracted by the said component extraction part becomes small
  • Feedback control is performed on the signal level of the cancellation signal
  • the level specifying unit determines that the harmonic component extracted by the component extraction unit is less than a predetermined threshold after feedback control by the cancellation control unit is started.
  • the signal level of the cancel signal is the signal level of the cancel signal that triggered the harmonic component to be less than the threshold value.
  • a signal level corresponding to Le is specified as signal level of the signal to be detected at that point.
  • the change in the external magnetic field due to the detected signal is canceled by feedback control of the cancellation signal, and the signal level of the detected signal is specified based on the signal component of the canceled signal thus canceled.
  • the cancel signal is output from the cancel coil wound around the same core member as the detection coil, and is affected by the same external magnetic field and temperature environment as the output signal from the detection coil. Therefore, changing the signal level of the cancel signal to cancel the change in the external magnetic field due to the detected signal means that the signal level corresponding to the signal level of the detected signal is reproduced by the cancel signal, This means that the signal level of the cancel signal corresponds to the signal level of the detected signal.
  • the signal level of the detected signal can be specified based on the signal component of the canceled signal thus canceled.
  • the cancel coil may be wound around the core member.
  • the exciting coil includes two coils wound around the first and second core members connected in series, and a signal flowing in one and a signal flowing in the other are in reverse phase and The number of windings and the positional relationship are determined so that the same signal level is obtained, and two of the detection coils wound around each of the first and second core members are connected in series and flow to one side. The number of windings and the positional relationship are determined so that the signal and the signal flowing on the other side have the same phase and the same signal level.
  • the component extraction unit extracts the output signal itself from the detection coils connected in series as the harmonic component. Furthermore, in the sensor element, two cancel coils are wound around the first and second core members in series, and a signal flowing in one and a signal flowing in the other have the same phase and the same signal level. Thus, the number of windings and the positional relationship are determined.
  • the excitation coil includes two coils wound around the first and second core members connected in series, and a signal flowing in one and a signal flowing in the other are reversed.
  • the number of windings and the positional relationship are determined so that the phase and the same signal level are obtained, and two of the detection coils wound around each of the first and second core members are connected in series, The number of windings and the positional relationship are determined so that the signal flowing to the other and the signal flowing to the other have the same phase and the same signal level.
  • the component extraction unit extracts the output signal itself from the detection coils connected in series as the harmonic component.
  • the cancel coil is one coil that is wound around the first and second core members together.
  • the eighth aspect in the sensor element, two of the exciting coils wound around the first and second core members are connected in series, and a signal flowing in one and a signal flowing in the other are reversed.
  • the number of windings and the positional relationship are determined so that the phase and the signal level are the same, and the detection coil is a single coil that is wound around the first and second core members. is there.
  • the component extraction unit extracts the output signal itself from the detection coils connected in series as the harmonic component.
  • two cancel coils are wound around the first and second core members in series, and a signal flowing in one and a signal flowing in the other have the same phase and the same signal level.
  • the number of windings and the positional relationship are determined.
  • the detection coil is a single coil that is wound around the first and second core members. is there.
  • the component extraction unit extracts the output signal itself from the detection coils connected in series as the harmonic component.
  • the cancel coil is one coil that is wound around the first and second core members together.
  • the sensor element according to the tenth aspect is formed of a magnetic material in an annular shape, and responds to an external magnetic field that changes due to the influence of a signal to be detected that penetrates the detection region surrounded by the annular shape.
  • the magnetic permeability ⁇ decreases at the apex of the external magnetic field 0, and the curvature of the curve when the change in the magnetic permeability ⁇ is plotted in the “coordinate system defined by the external magnetic field ⁇ the magnetic permeability ⁇ ” is A core member having a characteristic of increasing in accordance with an absolute value, an excitation coil wound around the core member to excite the core member, wound around the core member, and used for detecting the detected signal When the detected signal flows in a state where an excitation signal consisting of a fundamental wave component is energized to the excitation coil, a harmonic component corresponding to the magnetic permeability ⁇ of the core member at that time is provided. Basic wave generation Signal superimposed on is configured so as to be outputted from the detection coil.
  • the sensor element includes a cancel coil wound around the core member and energized with a cancel signal for canceling a change in the external magnetic field due to the influence of the detected signal.
  • the eleventh aspect (Claim 11) is adopted in which the harmonic component superimposed on the output signal from the detection coil changes due to the change of the external magnetic field due to the influence of the cancel signal energized to the coil. Good.
  • a control device is a control device connected to the sensor element according to any one of the first to ninth configurations, and from the output signal of the detection coil, Among the signal components included in the output signal, a component extraction unit that extracts a harmonic component superimposed on the fundamental wave component, a harmonic component that can be included in the output signal, and the harmonic component are generated
  • the signal level corresponding to the harmonic component extracted by the component extraction unit is set as the signal level of the detected signal at that time based on the correspondence relationship in which the signal level of the detected signal is associated with A level specifying unit for specifying; and an information output unit for outputting information indicating the signal level specified by the level specifying unit to the outside.
  • the sensor element includes a cancel coil that is wound around the core member and is energized with a cancel signal for canceling a change in the external magnetic field due to the influence of the detected signal.
  • the harmonic component superimposed on the output signal from the detection coil is changed. It is good to do so.
  • a cancel control unit that controls energization of a cancel signal to the cancel coil
  • the cancel control unit is configured to reduce the harmonic signal extracted by the component extraction unit.
  • FIG. 2A is a graph showing the characteristics of the core member (MH curve defined by change in magnetization M with respect to external magnetic field H).
  • FIG. 2B is a graph showing the characteristics of the core member (MH curve defined by change in magnetization M with respect to external magnetic field H; an enlarged view of the low magnetic field region in FIG. 2A).
  • FIG. 2C is a graph ( ⁇ -H curve defined by the external magnetic field H and the magnetic permeability ⁇ ) showing the characteristics of the core member.
  • FIG. 2D is a graph showing the characteristics of the core member ( ⁇ -H curve defined by the external magnetic field H and the magnetic permeability ⁇ ; an enlarged view of the low magnetic field region in FIG.
  • the sensor element 2 has a core member 21 formed of a magnetic material in an annular shape, an excitation coil 23 that is wound around the core member 21 and excites the core member 21, and is wound around the core member 21 to be detected. And a detection coil 25 used for signal detection.
  • the core member 21 responds to an external magnetic field that changes due to the influence of the detected signal when the detected electric wire 100 is passed through the detection region surrounded by the ring and the detected signal is conducted there.
  • the magnetic permeability ⁇ decreases with the external magnetic field 0 as the apex.
  • the permeability ⁇ is the slope of the MH curve (see FIGS. 2A and 2B) defined by the change of the magnetization M with respect to the external magnetic field H (that is, the differentiation of the magnetization M with respect to the magnetic field H, as shown in the following formula 1. Value) based on (value).
  • the magnetic member described in Japanese Patent Application No. 2010-215871 filed by the applicant of the present application may be adopted.
  • the detection coil 25 is configured to output a signal obtained by superimposing a harmonic component corresponding to the fundamental wave component.
  • the detection unit 3 is a control device that inputs and outputs various signals in order to specify the signal level of the detected signal based on the output signal from the sensor element 2 (the detection coil 25).
  • the component extraction unit 31 that extracts the harmonic component superimposed on the fundamental wave component, and the signal level corresponding to the harmonic component extracted by the component extraction unit 31 at that time point
  • a level specifying unit 33 for specifying the signal level of the detected signal
  • an information output unit 35 for outputting information indicating the signal level specified by the level specifying unit 33 to the outside
  • a signal source for energizing the excitation coil 23 37.
  • the level specifying unit 33 detects the detected signal based on the correspondence relationship that associates the harmonic component that can be included in the output signal and the signal level of the detected signal when the harmonic component is generated. Identify the signal level of the signal.
  • the signal source 37 energizes the exciting coil 23 by an AC signal (in this embodiment, a sine wave signal), and the AC component in this signal becomes a fundamental wave component via the core member 21 and is detected by the detection coil 25. Will be.
  • an AC signal in this embodiment, a sine wave signal
  • the detection unit 3 is provided with a displacement generation unit 39 that generates a displacement signal obtained by shifting the phase of the output signal by 1 ⁇ 2 period based on the output signal of the detection coil 25, and extracts components.
  • the unit 31 extracts a signal obtained by superimposing the output signal from the detection coil 25 and the displacement signal generated by the displacement generation unit 39 as a harmonic component.
  • the displacement generation unit 39 may be configured to generate a displacement signal by data processing after converting the output signal into a digital signal, or to generate a displacement signal that is shifted by a half cycle by a delay circuit. It is good also as composition to do.
  • the current sensor 1 according to the present embodiment includes two core members 21 arranged so that the same detected electric wire 100 flows in each detection region, and the core The difference from the first embodiment is that the exciting coil 23 and the detection coil 25 are wound around each member 21 and that the displacement generating unit 39 is not provided.
  • the exciting coils 23 are connected in series, and are wound so that the signal flowing through one exciting coil 23 and the signal flowing through the other exciting coil 23 have opposite phases and the same signal level. Number of times and positional relationship.
  • Each of the detection coils 25 is connected in series, and the number of times that the signal flowing in one detection coil 25 and the signal flowing in the other detection coil 25 are wound so that they have the same phase and the same signal level. It is a positional relationship.
  • the component extraction part 31 of the detection part 3 is comprised so that the output signal itself from the detection coil 25 connected in series may be extracted as a harmonic component.
  • the detection coil 25 uses the core composed of the first and second core members 21 as one core member, and combines them into the first and second core members 21. It may be wound around.
  • the current sensor 1 in the present embodiment includes a cancel coil 51 wound around the sensor element 2, and the detection unit 3 includes a cancel control unit 60. Since the configuration differs from the other embodiments, this difference will be described in detail.
  • the cancel coil 51 in the sensor element 2 is wound around the core member 21, and a cancel signal for canceling a change in the external magnetic field due to the influence of the detected signal is energized.
  • the sensor element 2 is configured to change the harmonic component superimposed on the signal output from the detection coil 25 by changing the external magnetic field under the influence of the cancel signal energized to the cancel coil 51. ing.
  • the cancel control unit 60 of the detection unit 3 controls the energization of the cancel signal to the cancel coil 51, and feedback controls the signal level of the cancel signal so that the harmonic component extracted by the component extraction unit 31 is reduced. Is configured to do.
  • the cancel control unit 60 compares the harmonic component (the signal level) detected by the component extraction unit 31 with a target value (“0” in the present embodiment) stored in advance in the memory, and outputs the deviation. 61, an integrator 63 that integrates the deviation output to the comparator 61 and outputs the integrated value, a level calculator 65 that calculates the signal level of the cancel signal based on the integrated value output to the integrator 63, A level control circuit 67 is provided for energizing a cancel signal to the cancel coil 51 and controlling the signal level according to the calculation result of the level calculator 65.
  • the level calculator 65 calculates a signal level that is increased or decreased by a certain value as a signal level of the cancel signal based on the sign of the integrated value output from the integrator 63.
  • the signal level of the cancel signal necessary for setting the integral value from the calculator 63 to “0” may be directly calculated.
  • the level specifying unit 33 of the detection unit 3 checks the output of the comparator 61 in the cancel control unit 60, and the deviation output to the comparator 61 is less than a predetermined threshold (for example, “ 0 ”), that is, when it is determined that the harmonic component matches the target value, the signal level of the cancel signal that triggers the harmonic component to fall below the threshold value is acquired from the level calculator 65. Based on this, the signal level of the detected signal at that time is specified.
  • a predetermined threshold for example, “ 0 ”
  • a correspondence relationship that correlates the harmonic component that is canceled according to the signal level of the cancel signal and the signal level of the detected signal when the harmonic component is generated.
  • the signal level corresponding to the signal level of the cancel signal that triggered the harmonic component to be less than the threshold is specified as the signal level of the detected signal at that time.
  • the signal level of the cancel signal that triggered the harmonic component to be less than the threshold value is calculated by the level calculator 65 based on the integral value “0” from the calculator 63.
  • the level specifying unit 33 checks the calculation value of the level calculator 65 to acquire the calculation value as the corresponding signal level.
  • the calculation value by the level calculator 65 is configured to be stored in time series, and the calculation value used for the calculation when the harmonic component is less than the threshold value is acquired as the corresponding signal level. It is good to do.
  • the processing and calculation by the detection unit 3 are configured to be realized by a hardware configuration.
  • these processes and operations may be realized by a software program and a microcomputer that executes the software program.
  • the detection unit 3 having a function as a microcomputer to execute a software program as shown below (see FIG. 6).
  • the program may be stored in the memory of the detection unit 3 in advance, but may be provided to the user in a state of being recorded on various recording media or distributed to the user of the current sensor 1 via the network. Good.
  • the detector 3 checks whether or not the output value from the component extraction unit 31 has reached a target value (a value less than a threshold value centered on the target value) (s110). Is not reached (s110: NO), the same calculation as that of the level calculator 65 is performed based on the target value (s120), and a control command is issued to the level control circuit 67 based on the calculated value (s130). ), And so on.
  • a target value a value less than a threshold value centered on the target value
  • the current sensor 1 is mainly composed of first and second core members 21 arranged along the direction in which the core members penetrate the detection regions, respectively, as shown in FIG. Since the configuration is different from the third embodiment in that the displacement generation unit 39 is not provided, this difference will be mainly described in detail.
  • the two exciting coils 23 in the sensor element 2 wound around the first and second core members 21 are connected in series so that the signal flowing in one and the signal flowing in the other have opposite phases and the same signal level.
  • the number of windings and the positional relationship are defined.
  • the detection coil 25 is wound so that two wound around the first and second core members 21 are connected in series so that the signal flowing in one and the signal flowing in the other have the same phase and the same signal level. The number of rotations and the positional relationship are determined.
  • the cancel coil 51 is wound in such a way that two wound around the first and second core members 21 are connected in series so that the signal flowing in one and the signal flowing in the other have the same phase and the same signal level. The number of rotations and the positional relationship are determined.
  • the component extraction part 31 is comprised so that the output signal itself from the detection coil 25 connected in series may be extracted as a harmonic component.
  • the detection coil 25 uses the core composed of the first and second core members 21 as one core member, and combines them into the first and second core members 21. It may be wound around.
  • the cancel coil 51 is wound around the first and second core members 21 by using the core composed of the first and second core members 21 as one core member. It may be a thing. Further, in this case, as shown in FIG. 8C, the detection coil 25 may be wound around the first and second core members 21 together.
  • a fundamental wave component that regularly increases or decreases from the signal component of the output signal is obtained by canceling the output signal itself and the displacement signal obtained by shifting the phase of the output signal by 1 ⁇ 2 period.
  • a signal is extracted in which harmonic components that increase or decrease irregularly as distortion are emphasized. Thereby, the signal in which the harmonic component is emphasized can be extracted, and the signal level of the detected signal can be specified therefrom.
  • the harmonic component is emphasized and output in this way, so a correspondence relationship with the signal level of the detected signal is prepared based on the emphasized harmonic component. It will be.
  • the excitation coils 23 are connected in series with opposite phases, and the detection coils 25 are connected in series with the same phase. While the wave component is canceled out, the harmonic component that irregularly increases or decreases as distortion is emphasized and output.
  • the exciting coils 23 are connected in series in opposite phases, and the detection coil 25 is the first and second core members 21 with the core formed by the first and second core members 21 as one core member. The same applies to the case where the components are wound together.
  • the output signal itself from the set of detection coils 25 connected in series can be extracted as a harmonic component, and the signal level of the detected signal can be specified therefrom.
  • the harmonic component is emphasized and output in this way, so a correspondence relationship with the signal level of the detected signal is prepared based on the emphasized harmonic component. It will be.
  • the external magnetic field can be changed by the cancel signal via the first and second core members 21. Moreover, in these current sensors 1, the change in the external magnetic field due to the detected signal is canceled by feedback control of the cancellation signal, and the signal level of the detected signal is specified based on the signal component of the canceled signal thus canceled. ing.
  • the cancel signal is output from the cancel coil wound around the same core member as the detection coil, and is affected by the same external magnetic field and temperature environment as the output signal from the detection coil. Therefore, changing the signal level of the cancel signal to cancel the change in the external magnetic field due to the detected signal means that the signal level corresponding to the signal level of the detected signal is reproduced by the cancel signal, This means that the signal level of the cancel signal corresponds to the signal level of the detected signal.
  • the signal level of the detected signal can be specified based on the signal component of the canceled signal thus canceled.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Measuring Magnetic Variables (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
  • Measurement Of Current Or Voltage (AREA)
  • Transformers For Measuring Instruments (AREA)
PCT/JP2013/056812 2012-03-12 2013-03-12 電流センサ、センサ素子および制御装置 Ceased WO2013137253A1 (ja)

Priority Applications (5)

Application Number Priority Date Filing Date Title
KR1020147028391A KR101616854B1 (ko) 2012-03-12 2013-03-12 전류센서, 센서소자 및 제어장치
HK15105315.0A HK1204806A1 (en) 2012-03-12 2013-03-12 Current sensor, sensor element, and control device
US14/384,712 US9448262B2 (en) 2012-03-12 2013-03-12 Current sensor having at least one cancel coil
CN201380014063.6A CN104169727B (zh) 2012-03-12 2013-03-12 电流传感器、传感器元件以及控制装置
EP13760825.3A EP2840400A4 (en) 2012-03-12 2013-03-12 Current sensor, sensor element and control device

Applications Claiming Priority (4)

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JP2012054623 2012-03-12
JP2012-054623 2012-03-12
JP2013048214A JP2013217914A (ja) 2012-03-12 2013-03-11 電流センサ、センサ素子および制御装置
JP2013-048214 2013-03-11

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EP2977776A1 (en) * 2014-07-21 2016-01-27 TE Connectivity Germany GmbH Method and device for detecting a residual current in a charging cable and charging cable using said device

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CN104849626A (zh) * 2015-04-10 2015-08-19 北京兴迪仪器有限责任公司 一种高压电力设备的工频信号采集装置
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