WO2005029099A1 - 電流測定装置及び試験装置と、これに用いる同軸ケーブル及び集合ケーブル - Google Patents
電流測定装置及び試験装置と、これに用いる同軸ケーブル及び集合ケーブル Download PDFInfo
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- WO2005029099A1 WO2005029099A1 PCT/JP2004/013753 JP2004013753W WO2005029099A1 WO 2005029099 A1 WO2005029099 A1 WO 2005029099A1 JP 2004013753 W JP2004013753 W JP 2004013753W WO 2005029099 A1 WO2005029099 A1 WO 2005029099A1
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- 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
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/18—Screening arrangements against electric or magnetic fields, e.g. against earth's field
-
- 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 relates to a current measuring device and a testing device, and a coaxial cable and a collective cable used for the same.
- the present invention relates to a current measuring device including a coil for generating a voltage indicating a current to be measured, a low impedance coaxial cable and a collective cable used for transmitting the current to be measured from a current source.
- a current measuring device that measures a current based on a magnetic field in which a current to be measured is generated.
- a current probe measures a current based on a voltage generated in a secondary coil according to a measured current flowing in a primary coil of a transformer.
- the power supply terminal of the electronic device and the current measurement device are connected by a coaxial cable or the like, and the current to be measured is input to the current measurement device.
- the observation band is determined by factors such as capacitance, inductance, and characteristic impedance.
- the characteristic impedance value of a coaxial cable becomes smaller as the outer diameter of the signal line (core wire) and the outer diameter of the insulator provided on the outer periphery of the signal line become closer.
- the outer diameter of the signal line is made closer to the outer diameter of the insulator by increasing the effective cross-sectional area and the effective radius of the conductor that becomes the signal line using the conductive laminate.
- the above coaxial cable has a characteristic impedance value of 50 ⁇ or more, and the cut-through resistance is increased by making the thickness of the outer insulator sufficient.
- the thickness of the insulator is made extremely thin and the outer diameter of the insulator is relatively reduced. It is necessary to reduce the size. To achieve this, it is necessary to increase the cut-through resistance to facilitate stripping of the insulator and to satisfy the withstand voltage of the insulator.
- an object of the present invention is to provide a current measuring device and a testing device that can solve the above-mentioned problems, and a coaxial cable and a collective cable used for the current measuring device and the testing device. This object is achieved by a combination of features described in the independent claims.
- the dependent claims define further advantageous embodiments of the present invention.
- a current measuring device for measuring a measured current flowing between a first measurement terminal and a second measurement terminal, one end of which is connected to the first measurement terminal.
- a primary coil electrically connected and having the other end electrically connected to the measurement second terminal; and a voltage indicating the current to be measured according to the current to be measured flowing through the primary coil.
- Resulting secondary coil A signal line for electrically connecting the one end of the primary coil and the first measurement terminal.
- a coaxial cable having a signal line, an insulating layer covering the signal line, and a tape-shaped conductor wound around the outer periphery of the insulating layer.
- a current measuring device comprising: the shield; and a second shield formed of a conductor provided on an outer periphery of the first shield.
- the plurality of primary coils the secondary coil that generates a voltage indicating the measured current according to the measured current flowing through the plurality of primary coils, and the plurality of primary coils, respectively.
- a plurality of coaxial cables each having a signal line for electrically connecting the one end of the corresponding primary coil and the first measurement terminal, and a shield.
- the current measuring device further includes a resistor for electrically connecting one end and the other end of the secondary coil, and the current measuring device sets a potential of the one end of the secondary coil to a value indicating the current to be measured. May be output as
- a core around which each of the primary coil and the secondary coil is wound may be further provided.
- a test apparatus for testing an electronic device, wherein the pattern generator generates an input pattern signal to be input to the electronic device, and supplies power to the electronic device.
- a power supply unit for supplying, the signal input unit for supplying the input pattern signal to the electronic device, a power supply terminal of the electronic device, and a current measurement unit for measuring a measured current flowing between the power supply unit.
- a determination unit that determines the quality of the electronic device based on a measurement result of the current measurement unit, wherein the current measurement unit has one end electrically connected to the power supply terminal, and the other end connected to the power supply unit.
- the power supply unit may supply an operating voltage to be received by the electronic device to the power terminal to the other end of the primary coil.
- the power supply unit may ground the other end of the primary coil.
- the current measuring unit may measure the current under measurement in accordance with a change in the value of the input pattern signal.
- the current measuring section includes a plurality of the primary coils, the secondary coil that generates a voltage indicating the measured current in accordance with the measured current flowing through the plurality of primary coils, and This corresponds to each of the plurality of primary coils, and includes a plurality of coaxial cables each having a signal line for electrically connecting the one end of the corresponding primary coil and the first measurement terminal, and a shield. You may have! ,.
- the electronic device includes a plurality of power supply terminals for receiving a predetermined potential, and each of the power supply terminals is electrically connected to one end of any one of the primary coils.
- the one end of the primary coil may be electrically connected to any one of the power supply terminals.
- the signal line, the insulating layer covering the signal line, and the first shield having a tape-shaped conductor wound around the outer periphery of the insulating layer are provided.
- a coaxial cable comprising: a second shield formed of a conductor provided on an outer periphery of the first shield. .
- a characteristic impedance value between the signal line and the first shield may be 2.5 ⁇ or less.
- the first shield includes a tape-shaped insulator, a first region wider than the tape-shaped insulator, and in parallel with the tape-shaped insulator, and one edge in a tape width direction.
- a tape-shaped composite tape body composed of a tape-shaped conductor having a predetermined width from a portion and including the tape-shaped insulator and a second region not overlapping with the tape-shaped insulator; In the tape-shaped conductor, at least a portion of the first region is a portion of the tape-shaped conductor that is already wound around the insulating layer in the second region.
- the tape-shaped insulator overlaps at least a part of the tape-shaped insulator and does not overlap with the tape-shaped insulator already wound on the insulating layer in the radial direction of the coaxial cable, and the tape-shaped conductor side is It may be wound around the outer periphery of the insulating layer so as to be in contact with the insulating layer.
- the tape-shaped conductor does not overlap with the tape-shaped insulator having a predetermined width from an edge opposite to an edge provided with the first region in a tape width direction.
- the composite tape body further includes a third region, wherein at least a part of the third region in the tape-shaped conductor is outside of the tape-shaped insulator already wound around the insulating layer.
- the tape-shaped conductor wound around the outer periphery of the insulating layer so as to overlap the second shield may be in contact with the second shield in at least a part of the third region.
- a plurality of coaxial cables having substantially the same length and the plurality of coaxial cables are paired with each other in the axial direction at each end of the plurality of coaxial cables.
- a fixed body that is bundled in parallel so as to be aligned with each other; and a plurality of coaxial cables, each end of which has a surface perpendicular to the axial direction and is exposed at each end of the plurality of coaxial cables.
- a signal line connector provided with a signal line connection conductor for electrically connecting each signal line of the plurality of coaxial cables; and the plurality of coaxial cables exposed near each end of the plurality of coaxial cables.
- a shielded cable having a shield connector for electrically connecting each shield of the cable is provided.
- the measured current is transmitted through a plurality of coaxial cables, the variation in the characteristic impedance of each coaxial cable is reduced, and the characteristic impedance is reduced. Accurate current measurement can be performed.
- FIG. 1 is a diagram showing an example of a configuration of a test apparatus 100 according to an embodiment of the present invention.
- FIG. 2 is a diagram showing an example of a configuration of a current measuring unit 110 according to the present embodiment.
- FIG. 3 is a flowchart showing an example of a test method according to the embodiment.
- FIG. 4 is a diagram showing another example of the configuration of the current measuring unit 110 according to the present embodiment.
- FIG. 5 is a diagram showing a configuration of a collective cable 500 according to the present embodiment.
- FIG. 6 is a diagram showing an example of a wiring pattern of a signal line connection conductor 560 according to the present embodiment.
- FIG. 6 (a) shows the first wiring pattern
- FIG. 6 (b) shows the second wiring pattern
- FIG. 6 (c) shows the third wiring pattern.
- FIG. 7 is a diagram showing a cross section of the coaxial cable 204 according to the present embodiment in a direction perpendicular to the axial direction.
- FIG. 8 is a diagram showing a configuration of a coaxial cable 204 according to the present embodiment.
- FIG. 9 is a diagram showing a cross section in the axial direction of the coaxial cable 204 according to the present embodiment.
- FIG. 10 is a diagram showing another example of the configuration of the coaxial cable 204 according to the present embodiment.
- FIG. 11 is a diagram showing, in a table format, results of actually measuring characteristics of the coaxial cable 204 according to the present embodiment.
- FIG. 12 is a graph showing the result of actually measuring the characteristic impedance value of the coaxial cable 204 according to the present embodiment.
- FIG. 12 (a) shows the measurement results of the characteristic impedance value when the number of the coaxial cables 204 is one
- FIG. 12 (b) shows the measurement results of the characteristic impedance values when the number of the coaxial cables 204 is five.
- FIG. 1 shows an example of a configuration of a test apparatus 100 according to an embodiment of the present invention.
- the test apparatus 100 is a test apparatus for testing the electronic device 102, and includes a pattern generation unit 104, a power supply unit 108, a signal input unit 106, a current measurement unit 110, and a determination unit 112. .
- the pattern generator 104 generates an input pattern signal to be input to the electronic device 102.
- the power supply unit 108 supplies power to the electronic device 102. In this embodiment Then, the power supply unit 108 supplies power to the electronic device 102 via the current measurement unit 110.
- the signal input unit 106 supplies an input pattern signal to the electronic device 102.
- the signal input unit 106 may be provided in, for example, a test head.
- the current measuring unit 110 measures a measured current flowing between the power supply terminal of the electronic device 102 and the power supply unit 108. In the present embodiment, the current measuring unit 110 measures the measured current according to a change in the value of the input pattern signal. The current measuring unit 110 may measure a transition of the IDD current according to a change in the input pattern signal, for example. In the present embodiment, the power supply unit 108 supplies the operating voltage VDD to the VDD power supply terminal of the electronic device 102. The test apparatus 100 may perform an IDDT test on the electronic device 102. Further, the current measuring section 110 may measure a change in ground current according to a change in the input pattern signal. In this case, the power supply unit 108 grounds the VSS power supply terminal of the electronic device 102.
- the determination unit 112 determines the quality of the electronic device 102 based on the measurement result of the current measurement unit 110. In the present embodiment, the determination unit 112 determines that the electronic device 102 is defective if the current value indicated by the measurement result is larger than a predetermined value.
- the electronic device is a component that performs a predetermined action according to a given current or voltage, such as a row f, an IC (Integrated Circuit), or a large-scale integrated circuit (IC).
- Active device power includes semiconductor components. Furthermore, these parts may be provided on a wafer, or may be combined into a single 3 ⁇ 4 / cage, or may be mounted on a printed circuit board to perform predetermined functions. Includes components such as breadboards that have been realized.
- FIG. 2 shows an example of the configuration of the current measuring section 110 according to the present embodiment.
- the current measurement unit 110 includes a plurality of primary coils 22, a plurality of coaxial cables 204, a first measurement terminal 208, a second measurement terminal 210, a resistor 206, a secondary coil 24, a core 20, and a current value calculation unit 202. Having.
- the current measuring unit 110 includes n (n is a predetermined positive integer) primary coils (22-1-22-n) and n coaxial cables (204 —1— 204— n).
- the current measuring unit 110 is a current measuring device that measures the current to be measured flowing between the first measurement terminal 208 and the second measurement terminal 210.
- each of the plurality of primary coils (22—11—22—n) is electrically connected to the first measurement terminal 208.
- the other end is electrically connected to the second measurement terminal 210.
- a terminal 26-k which is one end of the primary coil 22-k (k is an integer satisfying l ⁇ k ⁇ n) is electrically connected to the first measurement terminal 208.
- a terminal 28-k which is the other end of the primary coil 22-k is electrically connected to the second measurement terminal 210.
- the plurality of coaxial cables (204-1-204-n) respectively correspond to the plurality of primary coils (22-1-1 22-n).
- Each of the plurality of coaxial cables (204-1-204-n) has a signal line for electrically connecting one end of the corresponding primary coil 22 and the first measurement terminal 208, and a shield.
- the shield is preferably grounded.
- the shield may be connected to a power supply that outputs a predetermined voltage.
- the shield may be connected to a VDD power supply that supplies an operating voltage VDD of the electronic device 102. Further, the shield may be connected to the second measurement terminal 210.
- the signal line of the coaxial cable 204-k electrically connects the terminal 26-k, which is one end of the primary coil 22-k, to the first measurement terminal 208.
- the plurality of coaxial cables (204-1-1204-n) preferably have transmission impedance characteristics, for example, substantially each.
- the first measurement terminal 208 is electrically connected to the power supply terminal of the electronic device 102 described with reference to FIG. Further, the second measurement terminal 210 is electrically connected to the power supply unit 108 described with reference to FIG. That is, the terminal 26-k is electrically connected to the power supply terminal, and the terminal 28-k is electrically connected to the power supply unit 108.
- the terminal 26-k is electrically connected to the VDD power supply terminal of the electronic device 102.
- the power supply unit 108 supplies the operating voltage VDD that the electronic device 102 should receive to the VDD power supply terminal to the terminal 28-k.
- terminals 26-k may be electrically connected to a VSS power supply terminal of electronic device 102. In this case, the power supply unit 108 grounds the terminals 28-k.
- the resistor 206 electrically connects the terminal 30 as one end of the secondary coil 24 and the terminal 32 as the other end.
- the resistor 206 has a predetermined impedance Z0.
- the secondary coil 24 generates a voltage indicating the current to be measured according to the current to be measured flowing through the plurality of primary coils (22-1 to 22-n). Terminal 32 of secondary coil 24 is grounded.
- the secondary coil 24 is connected to the terminal 30 which is a voltage indicating the current to be measured. The potential is supplied to the current value calculation unit 202.
- the core 20 is a core around which a plurality of primary coils (22-1-22-n) and a secondary coil 24 are wound.
- Core 20 is preferably a ferromagnetic core.
- Core 20 may be, for example, a ferrite core.
- the core 20 has an annular shape.
- the core 20 has an annular shape having a substantially rectangular outer periphery and an inner periphery, and a plurality of primary coils (22-111-n) are wound around one long side of the substantially rectangular shape.
- a secondary coil 24 is wound around the long side of the.
- the core 20 may be a core on which a secondary coil 24 is wound by being laminated on a plurality of primary coils (22-1-22-n)! /.
- the core 20 may be a supersaturated core. In this case, when the magnitude of the current to be measured exceeds a predetermined current value, the core 20 is saturated, thereby preventing the potential of the terminal 30 from becoming excessively large. Thus, current measuring section 110 can efficiently measure a small current to be measured.
- the current value calculation unit 202 calculates a value indicating the measured current based on the potential of the terminal 30.
- the current measurement unit 110 supplies the value to the determination unit 112 described with reference to FIG.
- the current measuring section 110 may output the potential of the terminal 30 as a value indicating the current to be measured.
- a plurality of coaxial cables (204-1-1204-n) are connected in parallel with a power terminal of the electronic device 102 and a plurality of primary coils (22-1-122-n). Connecting. Therefore, according to the present embodiment, it is possible to reduce the influence of the characteristic impedance of each of the plurality of coaxial cables (204-1 to 204-n).
- the parallel connection also reduces the insertion impedance, which is the effect of the impedance Z0 of the resistor 206 on the measured current. Therefore, in the present embodiment, the number of turns of the primary coil 22 may be two or more. In this case, the current measuring section 110 can amplify the measured current with a high amplification degree. Thus, current measuring section 110 can measure a very small current with high accuracy. Further, according to the present embodiment, by connecting the power supply terminal of the electronic device 102 and the primary coil 22 via the coaxial cable 204, the parasitic inductance of the wiring can be reduced.
- FIG. 3 is a flowchart illustrating an example of a test method according to the test apparatus 100 described with reference to FIG. It is a chart.
- the test method is a test method for testing an electronic device.
- the test apparatus 100 first generates an input canoturn signal to be input to the electronic device 102 described with reference to FIG. 1 in a pattern generation step S102.
- the no-turn generation step S102 may be performed using the pattern generation unit 104 described with reference to FIG.
- an input pattern signal is supplied to the electronic device 102.
- the signal input step S104 may be performed using the signal input unit 106 described with reference to FIG.
- a voltage indicating the measured current generated in the secondary coil 24 described with reference to FIG. 2 is output as a measurement result indicating the measured current.
- the secondary coil 24 generates the voltage based on the current to be measured flowing through the plurality of primary coils (22-1-122-n) described with reference to FIG.
- the current measuring step S106 is performed by using the current measuring unit 110 described with reference to FIG.
- a determination step S108 the quality of the electronic device 102 is determined based on the measurement result in the current measurement step S106.
- the determination step S108 determines that the electronic device 102 is defective when the current value indicated by the measurement result is larger than a predetermined value.
- the determination step S108 may be performed using the determination unit 112 described with reference to FIG.
- the test apparatus 100 may terminate the operation after the determining step S108.
- FIG. 4 shows another example of the configuration of the current measuring unit 110 according to the present embodiment.
- the electronic device 102 includes a plurality of power terminals that receive a predetermined potential. Each power supply terminal is electrically connected to one end of one of the primary coils, and the one end of each primary coil is electrically connected to the power supply terminal of V or any one of them.
- the electronic device 102 has n VDD power supply terminals (302-1-302-n).
- the current measuring section 110 has n first measurement terminals (208-1 208-n).
- Measurement First terminal 208-k is electrically connected to VDD power supply terminal 302-k.
- the coaxial cable 204 1 k electrically connects the first measurement terminal 208 k to the terminal 26 k of the primary coil 22 k.
- the plurality of VDD power terminals (302-1-1 302-n) of the electronic device 102 are The current flowing between the power supply unit 108 and the power supply unit 108 described with reference to FIG. 1 can be measured.
- electronic device 102 may have more VDD power terminals.
- one measurement first terminal 208 is electrically connected to the plurality of VDD power supply terminals 302.
- one VDD power supply terminal 302 may be electrically connected to a plurality of first measurement terminals 208.
- the electronic device 102 may have a plurality of VSS power terminals as a plurality of power terminals connected to the current measuring unit 110.
- the plurality of terminals 26 may be electrically connected to each other.
- the current measuring unit 110 includes one primary coil 22 and one coaxial cable 204 connected to the primary coil 22 instead of the multiple primary coils 22 and the multiple coaxial cables 204. You may.
- the current measuring section 110 may include one primary coil 22 and a plurality of coaxial cables 204 connected to the primary coil 22. In this case, each signal line of the plurality of coaxial cables 204 may be electrically connected to the terminal 26 of the primary coil 22 and the first measurement terminal 208 common to the plurality of coaxial cables 204.
- the terminal 26 of the primary coil 22 may be electrically connected to the different first measurement terminals 208 of the plurality of first measurement terminals 208.
- FIG. 5 shows a configuration of the collective cable 500 according to the present embodiment.
- the characteristic impedance value of the entire collective cable 500 is reduced by the number of coaxial cables with respect to the characteristic impedance value of the coaxial cable. The purpose is to reduce it by a factor of one.
- the collective cable 500 includes a plurality of coaxial cables 204, a fixed body 540, a signal line connector 550, and a shield connector 570.
- Each of the plurality of coaxial cables 204 corresponds to one of the coaxial cables 204-1-n shown in FIG. 2 or FIG.
- Each of the plurality of coaxial cables 204 has substantially the same length, for example, 500 mm.
- the signal line 520 which is an internal conductor
- the insulating layer 525 is 0 mm. 8 mm
- shield 530 which is the outer conductor, 1. Omm is used in a state where it is exposed.
- each coaxial cable 204 has a characteristic impedance of several ⁇ or less, more preferably 2.5 ⁇ or less, in order to keep the characteristic impedance value of the collective cable 500 at 1 ⁇ or less, more preferably at 0.5 ⁇ or less. It is configured to be a value.
- the fixed body 540 includes a plurality of coaxial cables 20. 4 are bundled in parallel so that the ends of the plurality of coaxial cables 204 are aligned in the axial direction, and the plurality of coaxial cables 204 are fixed in a state of being arranged in parallel. More specifically, the fixed body 540 may be formed of a tape body with an adhesive, and the plurality of coaxial cables 204 may be fixed near both ends of the plurality of coaxial cables 204.
- the fixed body 540 may be formed of a plastic tape body, and the outer circumferences of the plurality of coaxial cables 204 may be fixed by fusion.
- the fixed body 540 may be formed of a heat-shrinkable tube, and heat-shrink to fix the plurality of coaxial cables 204.
- the signal line connector 550 has a surface perpendicular to the axial direction at each end of the plurality of coaxial cables 204.
- the signal line connector 550 is provided with a signal line connection conductor 560 that electrically connects each signal line 520 exposed at each end of the plurality of coaxial cables 204. Conduction is performed in a state of being arranged in parallel.
- the signal line connector 550 may be, for example, a printed circuit board provided perpendicular to the axial direction of the coaxial cable 204.
- the signal line connector 550 may have a plurality of through holes into which the signal lines 520 of each coaxial cable 204 are inserted, and may have a structure in which the plurality of through holes are connected to each other by the signal line connection conductor 560.
- the signal line connector 550 may be formed by forming a metal band or the like with a mold, and may be realized as a plug or the like that functions as the signal line connection conductor 560 on the entire surface.
- the shield connector 570 electrically connects the shields 530 exposed near the respective ends of the plurality of coaxial cables 204.
- the shield connector 570 may be, for example, a copper foil having a width of 1. Om m and a thickness of 20 ⁇ m.
- the characteristic impedance value of the collective cable 500 as a whole can be reduced by the number of coaxial cables relative to the characteristic impedance value of the coaxial cable. It can be reduced by a factor of one. That is, for example, five coaxial cables 204 are arranged in parallel, and the characteristics of each coaxial cable 204 are When the impedance value is 2 ⁇ , the characteristic impedance value of the collective cable 500 can be reduced to 0.4 ⁇ .
- the plurality of coaxial cables 204 can be bundled and kept together while maintaining the same length and the like. The arrangement of the collective cable 500 can be facilitated while minimizing the variation in characteristics occurring in the coaxial cable 204.
- FIG. 6 shows an example of a wiring pattern of the signal line connection conductor 560 according to the present embodiment.
- FIG. 6A shows the first wiring pattern.
- the first wiring pattern is used to electrically connect a plurality of signal lines 520 arranged in a row to a collective cable 500 in which a plurality of coaxial cables 204 such as five are arranged in a row.
- the first wiring pattern is suitable for realizing an integrated cable 500 that is easily bent in the direction perpendicular to the direction in which the coaxial cables 204 are arranged.
- the shield connector 570 connects the shields 530 of the plurality of coaxial cables 204 by wrapping them with the shield connector 570.
- FIG. 6B shows a second wiring pattern.
- the second wiring pattern electrically connects the signal lines 520 in a state in which a plurality of coaxial cables 204 such as five are arranged so as to minimize the cross-sectional area of a portion occupied by the collective cable 500.
- the second wiring pattern includes a through hole for inserting the signal line 520 of the coaxial cable 204 disposed at the center and a through hole for inserting the coaxial cable 204 disposed around the signal line 520. Wiring is provided.
- FIG. 6C shows a third wiring pattern.
- the third wiring pattern is provided for electrically connecting the signal lines 520 in a state where a large number of coaxial cables 204 such as nine are arranged in a lattice.
- the third wiring pattern includes wiring for electrically connecting through holes into which two or more signal lines 520 arranged in the row direction of each row are inserted, and wiring arranged in at least one column in the column direction. Wiring for electrically connecting the above-described through hole into which the signal line 520 is inserted is provided.
- the shields 530 of the coaxial cables 204 arranged in the central row are connected by wrapping them with the shield connectors 570, and then the outer periphery of each shield 530 of all the coaxial cables 204 is connected to the shield connectors 570. Connect by wrapping in.
- FIG. 7 shows a cross section of the coaxial cable 204 according to the present embodiment in a direction perpendicular to the axial direction.
- FIG. 8 shows a configuration of the coaxial cable 204 according to the present embodiment.
- FIG. 9 shows an axial cross section of the coaxial cable 204 according to the present embodiment.
- the coaxial cable 204 includes a first shield 738 having a signal line 520, an insulating layer 525 covering the signal line 520, a tape-shaped composite tape body 710 wound around the outer periphery of the insulating layer 525, and a first shield 738.
- a second shield 740 composed of a conductor provided on the outer periphery of the second shield 740, and an outer cover 750 provided on the outer periphery of the second shield 740.
- the signal line 520 is a conductor such as a tin-plated soft copper wire of 0.52 mm, for example.
- the insulating layer 525 has a tape-shaped insulator wound around the signal line 520, more specifically, a tape-shaped plastic body. That is, for example, the insulating layer 525 includes a first insulating layer 525a in which a polyester naphthalate (PEN) tape having a thickness of 1.2 / ⁇ and a relative dielectric constant of 3.5 is wound around the signal line 520 in a 1Z2 layer. Is done.
- PEN polyester naphthalate
- the insulating layer 525 has a tape-like plastic body with an adhesive such as a PEN tape having a relative dielectric constant of 3.5 with a hot melt adhesive having a thickness of 1.2 m, for example. It may include a second insulating layer 525b wound around the outer periphery of the first insulating layer 525a in two layers.
- the first insulating layer 525a is uniformly wound around the conductor
- the second insulating layer 525b is wound around a tape-shaped insulator having an adhesive layer wound on the first insulating layer 525a. Tightening force. For this reason, it is possible to realize a uniform ultra-thin insulator without any variation in the thickness and the outer diameter of the tape-shaped insulator after the winding, without the loosening of the insulator or the unevenness of the outer diameter caused by the loosening. As a result, the coaxial cable 204 can stably maintain the characteristic impedance value at a low value such as 2 ⁇ .
- the composite tape body 710 is configured by stacking a tape-shaped insulator 720 and a conductor 730.
- Insulator 720 may be, for example, a 2.5 mm wide, 2.5 m thick PET loop.
- the conductor 730 may be, for example, a copper foil tape that is wider than the insulator 720 and has a width of, for example, 3.0 mm and a thickness of 9 m.
- the insulator 720 is overlapped so that the insulator 720 is located at a substantially central position in the width direction of the conductor 730, and the conductor 730 is insulated by 1Z2 overlap with the conductor 730 side inside. Wound around the perimeter of layer 525.
- the conductor 730 has a first region 732 in parallel with the insulator 720 that is wider than the insulator 720, and one edge force in the tape width direction also has a predetermined width.
- the composite tape body 710 overlaps with at least a part of the second region 734 of the portion of the conductor 730 that has already been wound around the insulating layer 525 in the conductor 730 and is insulated.
- the body 720 is wound around the outer periphery of the insulating layer 525 such that the body 720 does not overlap with the insulator 720 already wound around the insulating layer 525 in the radial direction of the coaxial cable 204, and the conductor 730 is in contact with the insulating layer 525. Further, the composite tape body 710 is wound around the outer periphery of the insulating layer 525 so as to overlap at least a part of the third region 736 of the conductor 730 with the outside of the insulator 720 already wound around the insulating layer 525. Well! / ,.
- the composite tape body 710 overlaps at least a portion of the first region 732a with at least a portion of the second region 734b which is a portion already wound around the insulating layer 525, and the insulator 720a Does not overlap with the insulator 720b already wound around the insulating layer 525 in the radial direction of the coaxial cable 204, and at least partially acts on the third region 736a outside the insulator 720b already wound around the insulating layer 525. Thus, it is wound around the outer periphery of the insulating layer 525.
- the conductor 730 is exposed on the outer surface of the first shield 738, and thus comes into contact with the second shield 740 in at least a part of the third region 736.
- the conductor 730 and the second shield 740 function integrally as a shield wire, and the outer diameter of the insulator portion of the coaxial cable 204 can be substantially equal to the outer diameter of the insulating layer 525. Therefore, the outer diameter of the signal line 520 and the outer diameter of the insulator portion can be made substantially close, and the characteristic impedance can be reduced.
- the composite tape body 710 is, for example, a copper foil having a thickness of about 9. and a thickness of about 2. in order to withstand the tension when wound around the insulating layer 525 and to make it as thin as possible.
- Consists of PET when winding the composite tape body 710 around the insulating layer 525, In addition, it is possible to suppress elongation and cutting of the composite tape body 710 and to prevent wrinkles and gaps from occurring. Then, as a result of the first region 732 being superimposed and wound on the already wound second region 734, the first shield 738 can be brought into close contact with the insulating layer 525, and the portion in contact with the insulating layer 525 is formed by the conductor 730. A cylindrical shield layer can be formed. Further, the composite tape body 710 thus configured can maintain a high cut-through resistance, and thus facilitates peeling of the insulator.
- the second shield 740 is provided, for example, by winding a plurality of conductive wires around the outer circumference of the first shield 738 at a predetermined winding interval. That is, for example, the second shield 740 is provided by winding 35 tin-plated annealed copper wires of 0.05 mm in width at a winding interval of 4.5 mm.
- the outer skin 750 is provided, for example, as an extruded layer of FEP resin having a thickness of 100 mm. Based on the dimensions exemplified above, the outer diameter of the coaxial cable 204 is 0.88 mm.
- the insulating layer 525 is formed of an extremely thin tape-shaped plastic body, and the first shield is formed by the composite tape body 710 having the tape-shaped insulator 720 and the conductor 730.
- the 738 it is possible to realize a transmission line with low characteristic impedance, small variation in characteristics, and high cut-through resistance.
- FIG. 10 shows another example of the configuration of the coaxial cable 204 according to the present embodiment.
- the coaxial cable 204 shown in FIG. 10 has the same configuration as the composite tape body 710 in the coaxial cable 204 shown in FIGS. 7 to 9 except that it does not have the third region 736. Description is omitted.
- the composite tape body 710 in this example is stacked so that the insulator 720 contacts one edge of the conductor 730 in the tape width direction.
- FIG. 11 is a table showing the results of actual measurement of the characteristics of the coaxial cable 204 based on the dimensions exemplified above.
- withstand voltage test a gap between the signal line 520 and the first shield 738 and the second shield 740, an AC voltage of 300 V was applied for 60 seconds, and a test was made to determine whether or not the endurance was sufficient.
- insulation resistance test a DC voltage of 250 V was applied between the signal line 520 and the first shield 738 and the second shield 740, and the insulation resistance was measured after charging for 1 minute.
- FIG. 12 is a graph showing the results of actually measuring the characteristic impedance value of the coaxial cable 204 according to the present embodiment.
- Figure 12 (a) shows the characteristic impedance when there is one coaxial cable 204. The result of actual measurement of one dance value is shown.
- the signal line 520 at one end of the coaxial cape 204, the first shield 738 and the second shield 740 are connected to the SMA connector, and the signal line 520 at the other end, the first shield 738 and The second shield 740 was short-circuited.
- FIG. 12B shows the measured results of the characteristic impedance values when the number of the coaxial cables 204 is five. In the actual measurement in FIG.
- the signal lines 520 at one end of the coaxial cable 204 were connected to the signal line connector 550, and the shields 530 were connected to each other by the shield connector 570 and connected to the SMA connector.
- the signal lines 520 at the other end of the coaxial cable 204 were connected to the signal line connector 550, the shields 530 were connected to each other by the shield connector 570, and the signal line connector 550 and the shield connector 570 were short-circuited. .
- the coaxial cable 204 based on the dimensions exemplified above has a high withstand voltage, and a single cable has a resistance of 2.0 ⁇ to 2.5 ⁇ and five cables. Thus, a coaxial cable having a characteristic impedance value of 0.4 ⁇ can be realized.
- the current to be measured is transmitted through a plurality of coaxial cables, the variation in the characteristic impedance of each coaxial cable is reduced, and a low characteristic impedance is realized. Thereby, highly accurate current measurement can be performed.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Resistance Or Impedance (AREA)
- Measuring Leads Or Probes (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Transformers For Measuring Instruments (AREA)
- Measurement Of Current Or Voltage (AREA)
- Tests Of Electronic Circuits (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005514085A JPWO2005029099A1 (ja) | 2003-09-22 | 2004-09-21 | 電流測定装置及び試験装置と、これに用いる同軸ケーブル及び集合ケーブル |
US11/385,247 US7242197B2 (en) | 2003-09-22 | 2006-03-21 | Current measuring apparatus, test apparatus, and coaxial cable and assembled cable for the apparatuses |
US11/650,885 US7548076B2 (en) | 2003-09-22 | 2007-01-08 | Current measuring apparatus, test apparatus, and coaxial cable and assembled cable for the apparatuses |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003-330732 | 2003-09-22 | ||
JP2003330732 | 2003-09-22 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/385,247 Continuation US7242197B2 (en) | 2003-09-22 | 2006-03-21 | Current measuring apparatus, test apparatus, and coaxial cable and assembled cable for the apparatuses |
Publications (1)
Publication Number | Publication Date |
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WO2005029099A1 true WO2005029099A1 (ja) | 2005-03-31 |
Family
ID=34373025
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/013753 WO2005029099A1 (ja) | 2003-09-22 | 2004-09-21 | 電流測定装置及び試験装置と、これに用いる同軸ケーブル及び集合ケーブル |
Country Status (4)
Country | Link |
---|---|
US (2) | US7242197B2 (ja) |
JP (1) | JPWO2005029099A1 (ja) |
TW (1) | TWI350378B (ja) |
WO (1) | WO2005029099A1 (ja) |
Cited By (1)
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CN105067845A (zh) * | 2015-07-31 | 2015-11-18 | 上海卫星工程研究所 | 空间飞行器轻型地面转接测试系统 |
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US9757053B2 (en) * | 2008-02-07 | 2017-09-12 | Thomas J. Richards | Photo scaling guide configured to scale wounds or objects |
US8123704B2 (en) * | 2008-02-07 | 2012-02-28 | Richards Thomas J | Calibration and measurement system |
DE102010054848A1 (de) * | 2010-12-16 | 2012-06-21 | Conductix-Wampfler Ag | Vorrichtung zur induktiven Übertragung elektrischer Energie |
GB201306194D0 (en) * | 2013-04-05 | 2013-05-22 | Univ Nottingham | Diagnosis of incipient faults in a PMSM motor with coaxially insulated windings |
TW201504637A (zh) * | 2013-07-23 | 2015-02-01 | Iner Aec Executive Yuan | 利用切片取樣評估電纜老劣化之方法 |
US9651576B2 (en) | 2013-10-17 | 2017-05-16 | Thermo Keytek LLC | Low-side coaxial current probe |
DE102015102727A1 (de) * | 2015-02-25 | 2016-08-25 | Maschinenfabrik Reinhausen Gmbh | Verfahren zum Ändern der aktiven Windungszahl einer Regelwicklung in einer elektrischen Anlage und elektrische Anlage mit einer Regelwicklung |
US9810718B2 (en) * | 2015-03-13 | 2017-11-07 | Eaton Corporation | Wire wound resistor arrangement and sensing arrangement including the same |
US20180100878A1 (en) * | 2016-10-07 | 2018-04-12 | Cooper Technologies Company | Sensing device for an electrical system |
EP3803909A4 (en) | 2018-05-25 | 2022-03-02 | Samtec Inc. | ELECTRIC CABLE WITH DIELECTRIC FOAM |
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Also Published As
Publication number | Publication date |
---|---|
US20060202704A1 (en) | 2006-09-14 |
US7548076B2 (en) | 2009-06-16 |
US20070108987A1 (en) | 2007-05-17 |
JPWO2005029099A1 (ja) | 2007-11-15 |
TWI350378B (en) | 2011-10-11 |
US7242197B2 (en) | 2007-07-10 |
TW200512460A (en) | 2005-04-01 |
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