JP2022035655A - Power converter and current detector - Google Patents

Abstract

To reduce errors that occur when detecting electric currents of adjacent wirings.SOLUTION: Provided is a power converter comprising: a plurality of wirings arrayed in a first direction and extending in a second direction at right angles to the first direction; and a plurality of current detectors respectively provided for the plurality of wirings and arrayed in the first direction, each of the plurality of current detectors detecting an alternating current flowing through the corresponding wiring among the plurality of wirings. Each of the plurality of current detectors includes magnetic cores arranged around the corresponding wiring, and a plurality of electromagnetic conversion elements respectively arranged in a plurality of gaps formed at a point facing the magnetic core, the plurality of magnetic cores being configured such that the direction in which the plurality of gaps face exists within a range of ±45° with respect to a third direction which is orthogonal to the first and the second directions.SELECTED DRAWING: Figure 4

Description

The present disclosure relates to a power conversion device and a current detection device.

From an annular magnetic core arranged around a conductor that conducts a detected current, a plurality of Hall elements arranged in gaps formed at a plurality of locations of the annular magnetic core, and a plurality of Hall elements. A current detector having a multiplication circuit that outputs a voltage signal corresponding to the result of multiplying the values of the output voltage signals is known. By arranging Hall elements in multiple gaps in the magnetic core and multiplying the values of each voltage signal to obtain a voltage signal, the S / N ratio of the final voltage signal is improved. It is intended to increase the detection sensitivity as a current detector (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2011-17574

In order to detect the current flowing through each of the plurality of wirings provided in the power conversion device or the like, a current detector may be provided for each of the plurality of wirings. In this case, if the plurality of wires are close to each other, the plurality of current detectors may also be arranged close to each other.

FIG. 1 is a front view showing an example of a current detection device including a plurality of current detectors provided for each of a plurality of wirings adjacent to each other. The current detector 109 shown in FIG. 1 includes three current detectors 109u, 109v, 109w. The three current detectors 109u, 109v, 109w each have a plurality of Hall elements 141, 142 arranged in the plurality of gaps 131, 132 formed in the annular magnetic core 120, respectively. When a current flows in the central wirings 114u, 114v, 114w in the Y-axis direction, a magnetic flux as shown by a solid arrow is generated along each magnetic core 120. At this time, the leakage flux as shown by the broken line is generated from the gaps 131 and 132 in which the Hall elements 141 and 142 are installed. When the current detectors are so close to each other, the leakage flux is interlinked with the adjacent core or the Hall element attached to the gap of the core, and this leakage flux is also detected as a current. Therefore, it causes an error in the current detection of the adjacent wiring.

The present disclosure provides a power conversion device and a current detection device capable of reducing an error caused in current detection of adjacent wiring.

In one aspect of the disclosure,
A plurality of wirings arranged in the first direction and extending in the second direction perpendicular to the first direction,
A plurality of current detectors provided for each of the plurality of wires and arranged in the first direction are provided.
Each of the plurality of current detectors is a power conversion device that detects an alternating current flowing through the corresponding wiring among the plurality of wirings.
Each of the plurality of current detectors
With a magnetic core placed around the corresponding wiring,
It has a plurality of magnetic-electric conversion elements arranged in each of a plurality of gaps formed at opposite positions of the magnetic core.
The plurality of magnetic cores are provided by a power conversion device in which the opposite directions of the plurality of gaps are within ± 45 ° with respect to the first direction and the third direction orthogonal to the second direction. Will be done.

Further, in one aspect of the present disclosure,
Equipped with multiple current detectors arranged in the first direction,
Each of the plurality of current detectors
A magnetic core forming a central hole penetrating in the second direction perpendicular to the first direction,
It has a plurality of magnetic-electric conversion elements arranged in each of a plurality of gaps formed at opposite positions of the magnetic core.
The plurality of magnetic cores are provided by a current detector in which the opposing directions of the plurality of gaps are within ± 45 ° with respect to the first direction and the third direction perpendicular to the second direction. Will be done.

According to one aspect of the present disclosure, it is possible to reduce an error that occurs in current detection of adjacent wiring.

It is a front view which shows an example of the current detection apparatus which includes a plurality of current detectors provided for each of a plurality of wirings close to each other. It is a figure which shows the structural example of the power conversion apparatus in one Embodiment. It is a perspective view which shows the structural example of the current detection apparatus in 1st Embodiment. It is a front view which shows the structural example of the current detection apparatus in 1st Embodiment. It is a front view which shows the structural example of the current detection apparatus in 2nd Embodiment. It is a front view which shows the structural example of the current detection apparatus in 3rd Embodiment. It is a front view which shows the structural example of the current detection apparatus in 4th Embodiment. It is a perspective view which shows the current detection apparatus in one Embodiment. It is a top view which shows the current detection apparatus in one Embodiment. 9 is a cross-sectional view taken along the line FF shown in FIG. It is a perspective view which illustrates the embodiment which fixes the current detection apparatus in one Embodiment.

Hereinafter, a plurality of embodiments according to the present disclosure will be described with reference to the drawings.

FIG. 2 is a diagram showing a configuration example of the power conversion device according to the embodiment. The power conversion device 13 shown in FIG. 2 converts the AC input power supplied from the power supply 1 into the AC power supplied to the load 6 of the motor or the like. FIG. 2 illustrates an AC power source in which the power source 1 outputs three-phase AC power.

The load 6 is, for example, an electric motor having a plurality of coils, and in this example, a three-phase motor having a U-phase coil, a V-phase coil, and a W-phase coil. The motor may be a synchronous motor or an induction motor.

The power conversion device 13 includes, for example, a three-phase input wiring 15, a three-phase input terminal R, S, T, a three-phase output wiring 14, a three-phase output terminal U, V, W, a main circuit 5, and a current detection. The device 9 is provided. The main circuit 5 has a rectifier circuit 2, a smoothing circuit 3, and an inverter circuit 4.

The three-phase input wiring 15 is a wiring for inputting the three-phase AC power supplied from the power supply 1 to the rectifying circuit 2, and is an R-phase input wiring 15r, an S-phase input wiring 15s, and a T-phase input wiring 15t. including. The input wiring 15r passes an AC input current of the R phase and is connected to the input terminal R of the R phase. The input wiring 15s is connected to the S-phase input terminal S by passing an S-phase alternating current input current. The input wiring 15t passes an AC input current of the T phase and is connected to the input terminal T of the T phase.

The input wiring 15r may be a wiring connecting the power supply 1 and the input terminal R, a wiring connecting the input terminal R and the R-phase rectifying section of the rectifying circuit 2, or a series of connecting the power supply 1 and the R-phase rectifying section. Wiring may be used. The input wiring 15s may be a wiring connecting the power supply 1 and the input terminal S, a wiring connecting the input terminal S and the S-phase rectifying section of the rectifying circuit 2, or a series of connecting the power supply 1 and the S-phase rectifying section. Wiring may be used. The input wiring 15t may be a wiring connecting the power supply 1 and the input terminal T, a wiring connecting the input terminal T and the T-phase rectifying section of the rectifying circuit 2, or a series of connecting the power supply 1 and the T-phase rectifying section. Wiring may be used.

The three-phase output wiring 14 is a wiring that outputs three-phase AC power from the inverter circuit 4 to the load 6, and includes a U-phase output wiring 14u, a V-phase output wiring 14v, and a W-phase output wiring 14w. The output wiring 14u passes an AC output current of the U phase and is connected to the output terminal U of the U phase. The output wiring 14v passes an AC output current of the V phase and is connected to the output terminal V of the V phase. The output wiring 14w passes an AC output current of the W phase and is connected to the output terminal W of the W phase.

The output wiring 14u may be a wiring connecting the inverter circuit 4 and the output terminal U, a wiring connecting the output terminal U and the U-phase coil of the load 6, or a series of wiring connecting the inverter circuit 4 and the U-phase coil. Wiring may be used. The output wiring 14v may be a wiring connecting the inverter circuit 4 and the output terminal V, a wiring connecting the output terminal V and the V-phase coil of the load 6, or a series of wiring connecting the inverter circuit 4 and the V-phase coil. Wiring may be used. The output wiring 14w may be a wiring connecting the inverter circuit 4 and the output terminal W, a wiring connecting the output terminal W and the W-phase coil of the load 6, or a series of wiring connecting the inverter circuit 4 and the W-phase coil. Wiring may be used.

The rectifier circuit 2 converts alternating current supplied from the power supply 1 via the input wiring 15 into direct current. The rectifier circuit 2 is, for example, a full-wave rectifier circuit in which a plurality of diodes are configured in a bridge shape, but alternating current may be converted to direct current by a rectification method other than this.

The smoothing circuit 3 smoothes the DC voltage output from the rectifier circuit 2. The smoothing circuit 3 has, for example, a capacitive element 3a that smoothes the pulsation of a DC voltage.

The inverter circuit 4 generates AC power to be supplied to a load 6 such as a motor via an output wiring 14 based on the input DC power. When the power supply 1 is a DC power supply, the rectifier circuit 2 may be omitted, so that the power supply 1 may be connected to the smoothing circuit 3.

The inverter circuit 4 has a plurality of switching elements that are turned on or off according to a plurality of gate drive signals supplied from a gate drive circuit (not shown), and the input DC is converted into alternating current by switching of the plurality of switching elements. It is a power conversion circuit. FIG. 2 illustrates six switching elements S ₁ , S ₂ , S ₃ , S ₄ , S ₅ , and S ₆ . When the load 6 is a motor, the inverter circuit 4 rotates the rotor of the motor by supplying an alternating current drive current (in the case of a three-phase motor, a three-phase drive current) to the motor.

Two switching elements connected to the same output phase in the inverter circuit 4 are referred to as upper and lower arm switching elements. For example, one switching element has a transistor and a diode connected to the transistor in antiparallel. Specific examples of the transistor include an IGBT (Insulated Gate Bipolar Transistor) and a MOSFET (Metal Oxide Semiconductor Field Effect Transistor).

The intermediate connection points of the U-phase upper and lower arms (S ₁ , S ₂ ) are connected to one end of the U-phase output wiring 14u. The intermediate connection point of the V-phase upper and lower arms (S ₃ , S ₄ ) is connected to one end of the V-phase output wiring 14v. The intermediate connection point of the W-phase upper and lower arms (S ₅ , S ₆ ) is connected to one end of the W-phase output wiring 14w.

The current detection device 9 detects the current values of the phase currents of the U, V, and W phases flowing through the output wiring 14, and sets the phase current detection values Iu, Iv, and Iw representing the detected current values as control devices (not shown). Output. When supplying the three-phase AC power to the load 6, the current detection device 9 may detect the current flowing through each of the three-phase output wirings 14, or the output of two phases of the three-phase output wirings 14. The current flowing through each of the wirings may be detected. The control device (not shown) can calculate the phase current detection value for the remaining one phase from the phase current detection value for two phases based on the relationship of Iu + Iv + Iw = 0.

FIG. 2 illustrates a case where the current detection device 9 detects a current flowing through each of the three-phase output wirings 14. The current detection device 9 is provided for each of the three-phase output wirings 14u, 14v, 14w, and detects a plurality of alternating currents flowing through the corresponding wirings among the three-phase output wirings 14u, 14v, 14w (this). In the example, it has three) current detectors 9u, 9v, 9w.

The current detector 9u detects the phase current flowing through the U-phase output wiring 14u and outputs the phase current detection value Iu. The current detector 9v detects the phase current flowing through the V-phase output wiring 14v and outputs the phase current detection value Iv. The current detector 9w detects the phase current flowing through the W phase output wiring 14w and outputs the phase current detection value Iw.

FIG. 3 is a perspective view showing a configuration example of the current detection device according to the first embodiment. FIG. 4 is a front view showing a configuration example of the current detection device according to the first embodiment. The current detector 9A shown in FIGS. 3 and 4 is an example of the current detector 9, and includes three current detectors 9u, 9v, 9w provided for each of the three-phase output wirings 14u, 14v, 14w. Have.

The three-phase output wirings 14u, 14v, 14w are arranged in the first direction (X-axis direction in this example), and all are arranged in the second direction (Y-axis direction in this example) perpendicular to the first direction. It is a conductor to be stretched. The three-phase output wirings 14u, 14v, 14w are arranged side by side in the X-axis direction and run in parallel in the Y direction. The three-phase current detectors 9u, 9v, 9w are arranged in the same first direction (in this example, the X-axis direction) as the direction in which the three-phase output wirings 14u, 14v, 14w adjacent to each other are arranged. There is.

In the example shown in FIGS. It is a conductive member having a cross section whose longitudinal direction is (axial direction). FIGS. 3 and 4 illustrate the case where the three-phase output wirings 14u, 14v, 14w are flat plate-shaped busbars having a rectangular cross section. The wiring through which the current to be detected flows is not limited to the bus bar, and may be wiring of other forms such as a cable wire or a jumper wire.

The current detector 9u has a plurality of gaps formed at opposite positions of the magnetic core 20 and the magnetic core 20 arranged around the corresponding output wiring 14u among the plurality of output wirings 14u, 14v, 14w. It has a plurality of magnetic and electric conversion elements 41 and 42 arranged in each of 31 and 32. As shown in the figure, the current detectors 9v and 9w also have the same configuration as the current detector 9u. The magnetic core 20 of the current detector 9v is arranged around the corresponding output wiring 14v among the plurality of output wirings 14u, 14v, 14w. The magnetic core 20 of the current detector 9w is arranged around the corresponding output wiring 14w among the plurality of output wirings 14u, 14v, 14w.

The magnetic core 20 is an annular (in this example, annular) core in which a plurality of (two in this example) gaps 31 and 32 are formed at opposite positions, and is a second direction (in this example, an annular) core. A central hole is formed that penetrates in the Y-axis direction). The magnetic core 20 includes a plurality of core portions 21 and 22 divided by gaps 31 and 32, and is configured as a whole in an annular shape by a combination of a plurality of curved core portions 21 and 22. The plurality of output wirings 14u, 14v, 14w each penetrate the center hole of the corresponding magnetic core 20 in the Y-axis direction.

In the example shown in FIGS. 3 and 4, the magnetic core 20 has a gap formed in each of the portions facing the third direction (in this example, the Z-axis direction) perpendicular to the first direction and the second direction. .. The first gap 31 is located on the positive side in the Z-axis direction with respect to the central hole of the magnetic core 20 or the output wiring penetrating the central hole, and the second gap 32 is the central hole of the magnetic core 20. Alternatively, it is located on the negative side in the Z-axis direction with respect to the output wiring penetrating the central hole.

The shape of the magnetic core 20 as a whole is not limited to an annular shape, and may be formed into another annular shape such as an annular shape having a rectangular outer circumference as a whole.

The magnetic core 20 is formed of a soft magnetic material. Specific examples of the soft magnetic material include ferrite, amorphous, iron and the like.

The magnetic-electric conversion element 41 is inserted into the gap 31, and the magnetic-electric conversion element 42 is inserted into the gap 32. The magnetic conversion elements 41 and 42 are sensors that output a voltage according to the strength of the magnetic field. Specific examples of the magnetic-electric conversion elements 41 and 42 include Hall elements, magnetoresistive elements, and magnetic diodes.

For example, when a current is supplied from the inverter circuit 4 to the load 6, a magnetic flux is generated by the current flowing through the output wirings 14u, 14v, 14w, and most of the magnetic flux flows in the circumferential direction inside the corresponding magnetic core 20. When this magnetic flux passes through the magnetic-electric conversion elements 41 and 42 attached to the gaps 31 and 32 of the magnetic core 20, the magnetic-electric conversion elements 41 and 42 each output a voltage corresponding to the passed magnetic flux. A sensor circuit (not shown) including an amplifier circuit detects the current value of the current flowing through each of the output wirings 14u, 14v, 14w by detecting the output voltage of each of the magnetic conversion elements 41 and 42 of each phase. ..

The number of gaps formed in the magnetic core and the gap length differ depending on the magnitude of the current to be measured. For large capacity power converters, the gap length may be increased to avoid magnetic saturation due to large currents. However, if a large gap is provided at one location, the magnetic flux leaking to the periphery without passing through the magnetic-electric conversion element increases, so that an error is likely to occur in the current detection. Since the current detectors 9u, 9v, 9w in the first embodiment are provided with a plurality of gaps 31, 32, even if a relatively large current flows through the output wirings 14u, 14v, 14w, the gaps 31 and 32 can be used. It is possible to suppress the leaking magnetic flux and reduce the error that occurs in current detection.

In addition, the output wiring to which the current detector is mounted may be displaced from the center of the current detector due to vibration or mounting error, and may be arranged closer to one of the gaps. In this case, the biased magnetic flux distribution causes a bias in the magnetic flux densities of the two opposing gaps. In such a case, if the magnetic-electric conversion element is inserted into only one of the gaps, the current detection accuracy may decrease. However, in the current detection device 9A according to the first embodiment, by providing the magnetic / electric conversion elements in both gaps, the current detection accuracy can be improved by averaging the output voltages of the magnetic / electric conversion elements. ..

Further, in the current detection device 9A according to the first embodiment, in the plurality of magnetic cores 20, the facing directions of the plurality of gaps 31 and 32 are parallel to the first direction and the third direction perpendicular to the second direction. .. In the example shown in FIGS. 3 and 4, in any of the plurality of magnetic cores 20, the opposite directions of the plurality of gaps 31 and 32 are the X-axis direction in which the magnetic cores 20 are arranged and the plurality of output wirings 14u. 14v and 14w are parallel to the Z-axis direction perpendicular to the Y-axis direction in which they are stretched. In particular, in the example shown in FIGS. 3 and 4, the plurality of magnetic cores 20 have the plurality of gaps 31 and 32 facing each other in parallel directions. That is, the opposite directions of the plurality of gaps 31 and 32 in the V-phase magnetic material core 20 are also the opposite directions of the plurality of gaps 31 and 32 in the U-phase magnetic material core 20 as well as the W-phase magnetic material core 20. It is also parallel to the opposite directions of the plurality of gaps 31 and 32 in.

As described above, in any of the plurality of magnetic cores 20, the opposite directions of the plurality of gaps 31 and 32 are parallel to the Z-axis direction. As a result, the magnetic flux (broken line arrow) leaking from the gaps 31 and 32 of one magnetic material core 20 is the gap between the other magnetic material core 20 adjacent to the one magnetic material core 20 and the other magnetic material core 20. Almost no interlinking with the magnetic electric conversion elements 41 and 42 arranged at 31 and 32. In particular, the leakage flux directly interlinking the magnetic-electric conversion elements 41 and 42 can be greatly suppressed. Therefore, it is possible to reduce the error that occurs in the current detection of the adjacent output wiring.

In any of the plurality of magnetic cores 20, the opposing directions of the plurality of gaps 31 and 32 do not have to be parallel to the third direction in all of the plurality of magnetic cores 20 in terms of reducing the error caused in the current detection of the adjacent output wirings. For example, the plurality of magnetic cores 20 may cause an error in current detection of adjacent output wirings even if the opposite directions of the plurality of gaps 31 and 32 are within ± 45 ° with respect to the third direction. Can be reduced. In terms of reducing the error caused in the current detection of the adjacent output wirings, the plurality of magnetic cores 20 have the plurality of gaps 31 and 32 facing each other within a range of ± 22.5 ° with respect to the third direction. It is preferably in the range of ± 10 ° with respect to the third direction. In the plurality of magnetic cores 20, the facing directions of the plurality of gaps 31 and 32 are 0 ° with respect to the third direction in that the error caused in the current detection of the adjacent output wirings is remarkably reduced. It is preferable (that is, the embodiment illustrated in FIGS. 3 and 4).

The + (plus) angle with respect to the third direction represents an acute angle that opens counterclockwise with respect to the third direction when viewed from the Y-axis direction. The- (minus) angle with respect to the third direction represents an acute angle that opens clockwise with respect to the third direction when viewed from the Y-axis direction.

FIG. 5 is a front view showing a configuration example of the current detection device according to the second embodiment. In the second embodiment, the description of the same configuration as the above-described embodiment will be omitted by referring to the above-mentioned description. The current detection device 9B shown in FIG. 5 is an example of the current detection device 9.

In the current detection device 9B according to the second embodiment, in any of the plurality of magnetic cores 20, the opposite directions of the plurality of gaps 31 and 32 are relative to the first direction and the third direction perpendicular to the second direction. It is parallel to the direction of + 45 °. In particular, in the example shown in FIG. 5, the opposite directions of the plurality of gaps 31 and 32 in the V-phase magnetic material core 20 are also the opposite directions of the plurality of gaps 31 and 32 in the U-phase magnetic material core 20. It is also parallel to the opposite directions of the plurality of gaps 31 and 32 in the W-phase magnetic core 20.

As described above, even in the current detection device 9B of the second embodiment, the plurality of magnetic cores 20 have the opposite directions of the plurality of gaps 31 and 32 within a range of ± 45 ° with respect to the third direction. The magnetic flux (dashed line arrow) leaking from the gap 31 of one magnetic core 20 is arranged in another magnetic core 20 adjacent to the one magnetic core 20 or in the gap 31 of the other magnetic core 20. Almost no interlinking with the magnetic-electric conversion element 41. In particular, the leakage flux directly interlinking with the magnetic-electric conversion element 41 can be greatly suppressed. Therefore, it is possible to reduce the error that occurs in the current detection of the adjacent output wiring.

FIG. 6 is a front view showing a configuration example of the current detection device according to the third embodiment. In the third embodiment, the description of the same configuration as the above-described embodiment will be omitted by referring to the above-mentioned description. The current detection device 9C shown in FIG. 6 is an example of the current detection device 9.

In the current detection device 9C according to the third embodiment, the facing directions of the plurality of gaps 31 and 32 formed in the magnetic core 20 of each phase are + 45 ° and 0 ° with respect to the third direction, respectively. Is parallel to the direction of -45 °.

As described above, even in the current detection device 9C according to the third embodiment, the plurality of magnetic cores 20 have the opposite directions of the plurality of gaps 31 and 32 within a range of ± 45 ° with respect to the third direction. The magnetic flux (dashed line arrow) leaking from the gap 31 of one magnetic core 20 is arranged in another magnetic core 20 adjacent to the one magnetic core 20 or in the gap 31 of the other magnetic core 20. Almost no interlinking with the magnetic-electric conversion element 41. In particular, the leakage flux directly interlinking with the magnetic-electric conversion element 41 can be greatly suppressed. Therefore, it is possible to reduce the error that occurs in the current detection of the adjacent output wiring.

FIG. 7 is a front view showing a configuration example of the current detection device according to the fourth embodiment. In the fourth embodiment, the description of the same configuration as the above-described embodiment will be omitted by referring to the above-mentioned description. The current detection device 9D shown in FIG. 7 is an example of the current detection device 9.

In the example shown in FIG. 7, the three-phase output wirings 14u, 14v, and 14w are each conductive with a cross section having a longitudinal direction in which the plurality of gaps 31 and 32 face each other (in this example, the Z-axis direction). It is a member, and more specifically, it is a flat plate-shaped bus bar. In the plurality of magnetic cores 20 shown in FIG. 7, a plurality of gaps 31 and 32 are located on an extension line in the longitudinal direction (Z-axis direction in this example) of the cross section when viewed from the Y-axis direction.

In this way, when the magnetic and electrical conversion elements are provided in the two gaps 31 and 32, the current detector is arranged so that the gap is located on the extension line in the longitudinal direction of the cross section of the output wiring to which the current detector is attached. This makes it possible to reduce the error that occurs in current detection. Even if the output wiring is biased to either side of the gap, the biased distance is only the distance corresponding to the difference between the longitudinal length of the cross section of the output wiring and the inner diameter of the magnetic core. short. Therefore, it is possible to suppress the deviation of the magnetic flux density of the two gaps due to the deviation of the position of the output wiring, and it is possible to improve the current detection accuracy.

FIG. 8 is a perspective view showing the current detection device according to the embodiment. FIG. 9 is a top view showing the current detection device according to the embodiment. FIG. 10 is a cross-sectional view taken along the line FF shown in FIG. FIG. 11 is a perspective view illustrating a mode in which the current detection device in one embodiment is fixed. The embodiments shown in FIGS. 8 to 11 can be applied to the current detection device of each embodiment according to the present disclosure. In the current detectors 9 shown in FIGS. 8 to 11, the plurality of current detectors 9u, 9v, 9w are integrated by at least one of the case and the mold. As a result, it is possible to suppress the deviation of the arrangement positions of the plurality of current detectors 9u, 9v, 9w. The housing 50 shown in the figure may be a case in which a plurality of current detectors 9u, 9v, 9w are accommodated and integrated, or may be a molding material in which a plurality of current detectors 9u, 9v, 9w are molded and integrated. good. The housing 50 is fixed inside the housing 50 so as to surround the magnetic core 20 of each phase. The material of the housing 50 is, for example, plastic, but other materials may be used. The shape of the housing 50 may be different from the shape shown in the figure.

The housing 50 has a housing hole 51u through which the output wiring 14u penetrates in the Y-axis direction, a housing hole 51v through which the output wiring 14v penetrates in the Y-axis direction, and a housing hole 51w through which the output wiring 14w penetrates in the Y-axis direction. Is formed. The output wirings 14u, 14v, 14w are fixed to a fixed portion such as a fixed surface 60 (see FIG. 11) parallel to the XY plane parallel to the X-axis direction and the Y-axis direction.

Flange-shaped mounting portions 52, 53 are formed on both sides of the plurality of current detectors 9u, 9v, 9w in the X-axis direction in the housing 50. As shown in FIG. 11, the housing 50 is fixed to the fixing surface 60 at the mounting portions 52 and 53 by the fixing tool 61 such as a screw, so that the current detection device 9 can be easily fixed to the fixing surface 60. By fixing the output wirings 14u, 14v, 14w and the housing 50 to the common fixed surface 60, the effect of suppressing the deviation of the arrangement positions of the current detectors 9u, 9v, 9w with respect to the output wirings 14u, 14v, 14w. Will increase.

Although the power conversion device and the current detection device have been described above by embodiment, the present invention is not limited to the above embodiment. Various modifications and improvements, such as combinations and substitutions with some or all of the other embodiments, are possible within the scope of the present invention.

For example, the number of gaps in which the magnetic-electric conversion element is arranged is not limited to two, and may be three or more.

Further, the wiring through which the current to be detected flows is not limited to the output wiring 14, and may be the input wiring 15.

1 Power supply 2 Rectifier circuit 3 Smoothing circuit 3a Capacitive element 4 Inverter circuit 5 Main circuit 6 Load 9,9A, 9B, 9C, 9D, 109 Current detector 9u, 9v, 9w Current detector 13 Power converter 14, 14u, 14v , 14w Output wiring 15,15r, 15s, 15t Input wiring 20,120 Magnetic core 21,22 Core part 31,32,131,132 Gap 41,42 Magnetic conversion element 50 Housing 51u, 51v, 51w Housing hole 52 , 53 Mounting site 60 Fixing surface 61 Fixing tool

Claims (9)

A plurality of wirings arranged in the first direction and extending in the second direction perpendicular to the first direction,
A plurality of current detectors provided for each of the plurality of wires and arranged in the first direction are provided.
Each of the plurality of current detectors is a power conversion device that detects an alternating current flowing through the corresponding wiring among the plurality of wirings.
Each of the plurality of current detectors
With a magnetic core placed around the corresponding wiring,
It has a plurality of magnetic-electric conversion elements arranged in each of a plurality of gaps formed at opposite positions of the magnetic core.
The plurality of magnetic cores are power conversion devices in which the opposite directions of the plurality of gaps are within ± 45 ° with respect to the first direction and the third direction orthogonal to the second direction. The power conversion device according to claim 1, wherein the plurality of magnetic cores have the directions of the plurality of gaps facing each other within a range of ± 22.5 ° with respect to the third direction. The power conversion device according to claim 1 or 2, wherein the plurality of magnetic cores are parallel to each other in opposite directions of the plurality of gaps. The power conversion device according to any one of claims 1 to 3, wherein the plurality of magnetic cores are such that the opposite directions of the plurality of gaps are parallel to the third direction. Each of the plurality of wirings has a cross section having the opposite direction of the plurality of gaps as the longitudinal direction.
The power conversion device according to any one of claims 1 to 4, wherein the plurality of magnetic cores have the plurality of gaps located on an extension line in the longitudinal direction of the cross section. The power conversion device according to any one of claims 1 to 5, wherein the plurality of current detectors are integrated by at least one of a case and a mold. Equipped with an inverter circuit that converts direct current to alternating current
The power conversion device according to any one of claims 1 to 6, wherein the plurality of wirings are output wirings that output alternating current from the inverter circuit. Equipped with a rectifier circuit that converts alternating current to direct current
The power conversion device according to any one of claims 1 to 6, wherein the plurality of wirings are input wirings for inputting alternating current to the rectifier circuit. Equipped with multiple current detectors arranged in the first direction,
Each of the plurality of current detectors
A magnetic core forming a central hole penetrating in the second direction perpendicular to the first direction,
It has a plurality of magnetic-electric conversion elements arranged in each of a plurality of gaps formed at opposite positions of the magnetic core.
The plurality of magnetic cores are current detection devices in which the opposite directions of the plurality of gaps are within ± 45 ° with respect to the first direction and the third direction perpendicular to the second direction.

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