JP2018133864A - Output side connection structure of single-phase inverter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the impedance of an output side conductor and reduce leakage flux when connecting the AC output sides of a plurality of single-phase inverter units 1(1A-1F) in serial and in parallel.SOLUTION: Three single-phase inverter units 1A-1C are arranged on the upper stage, and three single-phase inverter units 1D-1F are arranged on the lower stage. v-output terminals 22 of the three single-phase inverter units 1A-1C on the upper stage are connected in serial to u-output terminals 21 of the three single-phase inverter units 1D-1F on the lower stage via a wide first conductor 31. The u-output terminals 21 of the three single-phase inverter units 1A-1C are connected in parallel to one another via a second conductor 32, and the v-output terminals 22 of the three single-phase inverter units 1D-1F are connected in parallel to one another via a third conductor 33. Since high-frequency currents flow in opposite directions through the widely overlapping conductors 31-33, the inductance is reduced and leakage flux is suppressed.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an output side connection structure using a conductor when a circuit is configured by connecting AC output sides of a plurality of single-phase inverter units in parallel or in series in a high frequency power supply device.

  In a high frequency power supply device, there are cases where a circuit is configured by connecting AC output sides of a plurality of single-phase inverter units in parallel or in series and parallel. Patent Document 1 discloses a configuration in which AC outputs of a pair of IGBT modules each including two switching circuits are connected in parallel by a plate-like conductor. The plate-like conductors connecting the output terminals of the two IGBT modules in parallel with each other also serve as output wiring, and are laminated on the two plate-like conductors on the input side with an insulating plate in between.

JP 2012-105382 A

  When the AC output sides of a plurality of single-phase inverter units are connected in parallel, for example, the length of the conductor increases according to the number of connected single-phase inverter units, the circuit inductance increases, and the impedance tends to increase. . Further, since a high-frequency alternating current flows through the conductor on the alternating current output side, the leakage magnetic flux to the outside is large, and problems such as heat generation due to induction heating of surrounding parts arise.

  An object of the present invention is to reduce the impedance of a conductor on the AC output side connecting a plurality of single-phase inverter units and reduce the leakage magnetic flux to the outside.

  In Patent Document 1, a conductor serving as an AC output terminal is overlapped with two plate-like conductors on the input side, but an effect such as a reduction in impedance and a reduction in leakage magnetic flux cannot be obtained.

  In the present invention, when the u output terminals and the v output terminals of a plurality of single-phase inverter units are connected in parallel or series-parallel by plate-like conductors, the two plate-like conductors are widened so that high-frequency currents flow in opposite directions. Overlapping and configuring. As a result, the effect of canceling the self-inductance between the two conductors can be greatly obtained, and the impedance can be reduced. In addition, since the current always flows in the opposite direction through the two conductors, the leakage magnetic flux is reduced.

The output side connection structure of the single-phase inverter according to the specific first invention is as follows:
It includes n first single-phase inverter units connected in parallel and n second single-phase inverter units connected in parallel, and these are arranged in a matrix of “2 rows × n columns”. In addition, each single-phase inverter unit includes a plurality of single-phase inverter units each having a u output terminal and a v output terminal positioned side by side in the column direction of the matrix;
The u output terminal or v output terminal of the first single-phase inverter unit adjacent to each other in the column direction of the matrix and the v output terminal or u output terminal of the second single-phase inverter unit are connected in series. The n output terminals along the row direction of the matrix are connected to each other so that the n output terminals having a length over both output terminals along the column direction and arranged in the row direction of the matrix are connected to each other. A plate-like first conductor having a width across;
The other output terminals of the n first single-phase inverter units have a width equal to the first conductor along the row direction of the matrix and are connected to the first conductor via an insulating plate so as to be connected to each other. A plate-like second conductor that extends to an intermediate part in the column direction of the matrix and whose tip part constitutes one of the device output terminals;
The other output terminals of the n second single-phase inverter units have the same width as the first conductor along the row direction of the matrix and connect the other output terminals of the n second single-phase inverter units with the insulating plate interposed therebetween. And a plate-like third conductor that extends to the middle part in the column direction of the matrix and whose tip part constitutes the other of the device output terminals,
It is configured with. Note that n is an arbitrary natural number of 2 or more.

  In this configuration, the n first single-phase inverter units and the second single-phase inverter unit are connected in parallel to each other, and then both are connected in series. For example, the first conductor connects the u output terminal of the first single-phase inverter unit and the v output terminal of the second single-phase inverter unit in series. The first conductors simultaneously connect the u output terminals of the n first single-phase inverter units in parallel and connect the v output terminals of the n second single-phase inverter units in parallel. The second conductor is connected to the v output terminals of the n first single-phase inverter units in parallel, and the end portion becomes a v-phase device output terminal. The third conductor is connected to the u output terminals of the n second single-phase inverter units in parallel, and the end portion serves as a u-phase device output terminal.

  Therefore, a high-frequency current flows in the opposite direction between the first conductor and the second conductor that are overlapped with each other via the insulating plate. Similarly, the first conductor and the third conductor have a high-frequency current in the opposite direction. Current flows. Thereby, an inductance reduces and a leakage magnetic flux is suppressed.

In a preferred embodiment, the n first single-phase inverter units are arranged side by side on the upper stage of the gantry, and the n second single-phase inverter units are arranged on the lower stage of the gantry,
Each single-phase inverter unit has a u output terminal and a v output terminal on the front surface, and the u output terminal is positioned relatively above the v output terminal,
The first conductor is connected to n v output terminals of the first single-phase inverter unit located in the upper stage and n u output terminals of the second single-phase inverter unit located in the lower stage.

  Thus, space is saved by arranging single-phase inverter units in two upper and lower stages.

In a more specific embodiment,
The first conductor is a rectangular flat plate-shaped central plane portion, and is bent from both ends of the plane portion so as to form an L-shaped cross section, so that the first single-phase inverter unit and the second single-phase inverter unit Each having a bent portion connected to n output terminals,
The second conductor includes a flat plate portion having a rectangular plate shape that is substantially half the size of the flat portion of the first conductor, and is bent from the end of the flat portion so as to form an L-shaped cross section. A bent portion connected to the n output terminals of the phase inverter unit,
The third conductor has a rectangular plate shape that is approximately half the size of the flat portion of the first conductor, and is bent from one end of the flat portion so as to form an L-shaped cross section. And a bent portion connected to n output terminals of the phase inverter unit.

The output side connection structure of the single-phase inverter according to the second invention is:
a first single-phase inverter unit having u output terminals and v output terminals on opposite sides, and a second single-phase inverter unit having u output terminals and v output terminals on opposite sides, respectively. And a set of single-phase inverter units arranged side by side so that the u output terminals and the v output terminals are located on the same plane,
A plate-like u-phase first conductor extending across the u output terminal of the first single-phase inverter unit and the u output terminal of the second single-phase inverter unit so as to connect to each other;
Having a flat portion passing through the gap between the first single-phase inverter unit and the second single-phase inverter unit, and having a bent portion bent from the flat portion toward the first single-phase inverter unit, A plate-like u-phase second conductor in which the bent portion overlaps with the u-phase first conductor and is fixed to the u output terminal of the first single-phase inverter unit, and one end of the plane portion becomes the u-phase second output terminal. When,
The planar portion of the u-phase second conductor overlaps with the planar portion and passes through the gap between the first single-phase inverter unit and the second single-phase inverter unit. A bent portion that is bent toward the inverter unit side, the bent portion overlaps with the u-phase first conductor and is fixed to the u output terminal of the second single-phase inverter unit, and one end of the plane portion is the u-phase A plate-shaped u-phase third conductor that becomes a u-phase second output terminal together with one end of the second conductor;
A plate-like v-phase first conductor extending across the first single-phase inverter unit and the second single-phase inverter unit so as to connect the v-output terminal and the v-output terminal of the second single-phase inverter unit;
The planar portion of the u-phase second conductor and u-phase third conductor overlaps with the planar portion and passes through the gap between the first single-phase inverter unit and the second single-phase inverter unit. A bent portion bent toward the first single-phase inverter unit, and the bent portion overlaps with the v-phase first conductor and is fixed to the v output terminal of the first single-phase inverter unit; A plate-like v-phase second conductor having one end serving as a v-phase second output terminal;
A planar portion passing through the gap between the first single-phase inverter unit and the second single-phase inverter unit, overlapping the planar portions of the u-phase second conductor, u-phase third conductor and v-phase second conductor; And having a bent portion bent from the planar portion toward the second single-phase inverter unit, and the bent portion overlaps with the v-phase first conductor and serves as the v output terminal of the second single-phase inverter unit. A plate-shaped u-phase third conductor that is fixed and has one end of the flat surface portion serving as a v-phase second output terminal together with one end of the v-phase second conductor;
An insulating plate interposed between the plane portions of the u-phase second conductor and the u-phase third conductor and the plane portions of the v-phase second conductor and the v-phase third conductor;
It is configured with.

  In this configuration, the u output terminals of two single-phase inverter units that are one set are connected in parallel via the u-phase first conductor, and the v output terminals are connected in parallel via the v-phase first conductor. Is done. The u output connected in parallel is drawn out between the two single-phase inverter units via the u-phase second conductor and the u-phase third conductor, and the v output connected in parallel is also connected to the v-phase second conductor. It is drawn out between two single-phase inverter units via a conductor and a v-phase third conductor. The plane portions of the u-phase second conductor, u-phase third conductor, v-phase second conductor, and v-phase third conductor are overlapped with each other. Accordingly, the high-frequency current flows in the opposite direction between the u-phase second and third conductors and the v-phase second and third conductors, thereby reducing inductance and suppressing leakage magnetic flux.

In one aspect of the second invention,
Two sets of the first single-phase inverter unit and the second single-phase inverter unit are provided, and the two single-phase inverter units of the first set and the two single-phase inverter units of the second set are in parallel. Has been placed,
further,
A plate-like u-phase fourth conductor that connects the first set of u-phase second output terminals and the second set of u-phase second output terminals to each other and has a u-phase third output terminal in the center; ,
A plate-like v-phase fourth conductor that connects the first set of v-phase second output terminals and the second set of v-phase second output terminals to each other and has a v-phase third output terminal in the center; ,
With
The u-phase fourth conductor and the v-phase fourth conductor overlap with each other through an insulating plate.

  In this configuration, u output terminals of a total of four single-phase inverter units are connected in parallel, and v output terminals are similarly connected in parallel. Since the u-phase fourth conductor that becomes the final u-phase output terminal and the v-phase fourth conductor that becomes the final v-phase output terminal overlap, the high-frequency current also flows in the reverse direction in this portion. As a result, the inductance can be reduced and the leakage magnetic flux can be reduced.

In a specific embodiment, the single-phase inverter unit includes a pair of switching element modules disposed on both sides of the heat sink with a central heat sink interposed therebetween,
Each switching element module includes two switching circuits, one switching element module has a u output terminal, and the other switching element module has a v output terminal.

  According to the present invention, the two plate-like conductors on the AC output side of the single-phase inverter are combined so that the high-frequency current flows in opposite directions and are overlapped so as to be in wide contact with each other, so that the self-inductance is canceled out. Is greatly obtained, and the impedance can be reduced. In addition, leakage magnetic flux is reduced, and heat generation due to induction heating of surrounding parts is suppressed.

The front view of the whole inverter apparatus of 1st Example provided with the output side connection structure which concerns on 1st invention. The side view of the whole inverter apparatus of 1st Example similarly. The exploded perspective view of the 1st-3rd conductor. The circuit diagram which shows the circuit structure of the inverter apparatus of 1st Example. The circuit diagram which shows the circuit structure of one single phase inverter unit. The perspective view of the whole inverter apparatus of 2nd Example provided with the output side connection structure which concerns on 2nd invention. The front view which shows the structure of one set of single phase inverter units. The side view which similarly shows the structure of one set of single phase inverter units. The exploded perspective view of one set of single phase inverter units and each conductor. The circuit diagram which shows the circuit structure of the inverter apparatus of 2nd Example.

  First, one embodiment of the first invention will be described with reference to the drawings.

  FIG. 1 and FIG. 2 are a front view and a side view showing the entire inverter device of the first embodiment having the output side connection structure of the first invention. The inverter device according to the first embodiment includes a total of six single-phase inverter units 1 (1A to 1F), and the upper support base among the bases 2 having the upper and lower support stages 2U and 2L. Three single-phase inverter units 1A to 1C are arranged side by side in 2U, and the remaining three single-phase inverter units 1D to 1F are arranged side by side on a lower support base 2L. Single-phase inverter unit 1A and single-phase inverter unit 1D are positioned vertically aligned, single-phase inverter unit 1B and single-phase inverter unit 1E are positioned vertically aligned, single-phase inverter unit 1C and single-phase inverter unit 1F is aligned vertically. That is, when viewed from the front as shown in FIG. 1, they are arranged in a matrix of “2 rows × 3 columns”. In this example, the horizontal direction in FIG. 1 corresponds to the “row direction” of the matrix, and the vertical direction corresponds to the “column direction” of the matrix.

  FIG. 4 shows a circuit configuration of the inverter device of the first embodiment. The three single-phase inverter units 1A to 1C correspond to the “first single-phase inverter unit” in claim 1, and each input terminal P, N is connected in parallel to the DC power sources P1, N1. Yes. The u output terminals of these three single-phase inverter units 1A to 1C are connected in parallel to each other and then connected to the input side of the external matching transformer 3 as the u-phase output (U) of the entire apparatus. . The v output terminals of the three single-phase inverter units 1A to 1C are connected in parallel to each other. These three single-phase inverter units 1A to 1C are PWM-controlled by the control circuit 4A.

  The remaining three single-phase inverter units 1D to 1F correspond to the “second single-phase inverter unit” in claim 1, and the input terminals P and N are connected in parallel to the DC power sources P2 and N2, respectively. Has been. The u output terminals of these three single-phase inverter units 1D to 1F are connected in parallel to each other. The v output terminals of the three single-phase inverter units 1D to 1F are connected in parallel to each other and then connected to the input side of the matching transformer 3 as the v-phase output (V) of the entire apparatus. These three single-phase inverter units 1D to 1F are PWM-controlled by the control circuit 4B.

  Then, the v output terminals of the three single-phase inverter units 1A to 1C connected in parallel are connected to the u output terminals of the three single-phase inverter units 1D to 1F connected in parallel. Accordingly, the six single-phase inverter units 1D to 1F have a circuit configuration of 3 parallels and 2 series.

  Each single-phase inverter unit 1 (1A to 1F) is not particularly limited. For example, as illustrated in FIG. 5, the single-phase inverter unit 1 (1A to 1F) includes two IGBT modules 11 and 12 and a smoothing capacitor 13. Yes. The IGBT module 11 includes two switching circuits S1 and S2 serving as an upper arm and a lower arm, and a u output terminal is drawn from an intermediate connection point. Similarly, the IGBT module 12 includes two switching circuits S3 and S4, and a v output terminal is drawn from the intermediate connection point.

  As shown in FIGS. 1 and 2, each single-phase inverter unit 1 (1 </ b> D to 1 </ b> F) has a rectangular parallelepiped housing, and a u output terminal 21 and a v output terminal 22 are provided at the center of the front surface thereof. Adjacent to the top and bottom. Specifically, the u output terminal 21 is located above and the v output terminal 22 is located below. These output terminals 21 and 22 are made of plate-shaped conductors bent in an L shape, the u output terminal 21 is bent upward, and the v output terminal 22 is bent downward. As shown in FIG. 2, a P input terminal 23 and an N input terminal 24 are also provided adjacent to each other in the vertical direction at the center of the rear surface of the housing. The P input terminal 23 and the N input terminal 24 are similarly bent in an L shape, and are connected to the input side conductors 25, 26, 27, 28 serving as wiring from the DC power source (P1, N1 or P2, N2). Connected.

  The v output terminals 22 of the three single-phase inverter units 1A to 1C arranged in the upper stage 2U of the gantry 2 and the u output terminals 21 of the three single-phase inverter units 1D to 1F arranged in the lower stage 2L are wide. The first conductors 31 made of plate conductors are connected to each other. Further, the u output terminals 21 of the three single-phase inverter units 1A to 1C arranged in the upper stage 2U are connected in parallel to each other by a second conductor 32 that is also formed of a wide plate-like conductor. The v output terminals 22 of the three single-phase inverter units 1D to 1F arranged in the lower stage 2L are connected to each other in parallel by a third conductor 33 made of a wide plate conductor.

  In order to facilitate understanding, reference numerals such as corresponding conductors are attached to the respective wirings in the circuit diagram of FIG. Further, the range surrounded by the phantom line M in the circuit diagram of FIG. 4 corresponds to the configuration of the inverter device shown in FIGS. 1 and 2.

  The first conductor 31 is formed from a single metal plate, and as shown in the exploded perspective view of FIG. 3, a central flat portion 41 having a rectangular plate shape and a cross section from the upper end of the flat portion 41. A bent portion 42 bent at a right angle so as to form an L shape and connected to the v output terminal 22 of the upper single-phase inverter units 1A to 1C, and a right angle so as to form an L shape in cross section from the lower end of the flat portion 41 And a bent portion 43 that is bent and connected to the u output terminal 21 of the lower single-phase inverter units 1D to 1F. The tips of the bent portions 42 and 43 are further bent downward and upward, and bolts and nuts (not shown) are respectively provided at the tips of the L-shaped v output terminal 22 and u output terminal 21. It is fixed and connected via The first conductor 31 is wide enough to include the v output terminal 22 of the three single-phase inverter units 1A to 1C and the u output terminal 21 of the three single-phase inverter units 1D to 1F (left and right in FIG. 1). And a length that can include the v output terminal 22 and the u output terminal 21 that are separated from each other in the vertical direction (the vertical dimension in FIG. 1).

  The second conductor 32 is also formed from a single metal plate, and has a flat plate portion 44 having a rectangular plate shape having the same width as the flat plate portion 41 of the first conductor 31 and almost half the length. A bent portion 45 that is bent at a right angle so as to form an L-shaped cross section from the upper end of the flat portion 44 and connected to the u output terminals 21 of the three single-phase inverter units 1A to 1C, and a cross section from the lower end of the flat portion 44 And a bent portion 46 bent at a right angle toward the opposite side so as to form an L shape. The tip of the bent portion 45 is further bent upward, and is fixed and connected to the tip of the L-shaped u output terminal 21 via a bolt and a nut (not shown). The tip of the bent portion 46 is further bent upward, and constitutes a u-phase device output terminal 46a.

  The third conductor 33 has a configuration that is substantially vertically symmetrical with the second conductor 32 and has a rectangular plate shape having the same width as the flat portion 41 of the first conductor 31 and approximately half the length. A portion 47, a bent portion 48 bent at a right angle so as to form an L-shaped cross section from the lower end of the flat portion 47, and connected to the v output terminals 22 of the three single-phase inverter units 1D to 1F; And a bent portion 49 bent at a right angle from the upper end of 44 toward the opposite side so as to form an L-shaped cross section. The tip of the bent portion 48 is further bent downward, and is fixed and connected to the tip of the L-shaped v output terminal 22 via bolts and nuts (not shown). The tip of the bent portion 49 is further bent downward to form a v-phase device output terminal 49a.

  As shown in FIG. 2, the second conductor 32 and the third conductor 33 are overlapped on the surface of the first conductor 31 via an insulating plate 50. Note that the second conductor 32 (or the third conductor 33), the insulating plate 50, and the first conductor 31 may be in contact with each other without a gap, or there may be a very small gap.

  In the inverter device of the first embodiment as described above, the six single-phase inverter units 1A to 1F are arranged vertically in the form of “2 × 3”. Compared with the case where the 1Fs are arranged in a line, the installation area of the apparatus is reduced, the space is reduced as a whole, and the circuit loop is shortened. By shortening the circuit loop, it is possible to reduce the inductance of the circuit and hence the impedance.

  In the first conductor 31, the second conductor 32, and the third conductor 33, the high-frequency current flows in the opposite direction, so that the action of canceling the self-inductance is obtained and the leakage magnetic flux is reduced. In particular, in the above-described configuration, each of the conductors 31 to 33 is wide and has a large area that overlaps each other (particularly, an overlapping area at a portion where a high-frequency current flows in the opposite direction). Therefore, the effect of canceling the self-inductance between the conductors is increased. Also, a larger current flows near the skin of each of the conductors 31 to 33 due to the skin effect, but a high-frequency current flows in the opposite direction near the skin with two conductors that are widely overlapped. It is done. By reducing the leakage magnetic flux, the influence on surrounding parts is suppressed, and for example, a shielding plate is not required.

  In addition, since each of the wide conductors 31 to 33 has a large cross-sectional area, a sufficient cross-sectional area can be secured even if there is a substantial decrease in the cross-sectional area due to the skin effect. Heat generation is suppressed. Therefore, for example, in the above inverter device, the conductors 31 to 33 can be air-cooled without being liquid-cooled.

  In the above embodiment, three single-phase inverter units 1A to 1C and 1D to 1F are arranged in two upper and lower stages to realize a “2 rows × 3 columns” matrix layout. For example, a layout of “2 rows × 3 columns” can be formed by rotating the layout of FIG. 1 by 90 °. That is, n single-phase inverter units may be arranged in the horizontal direction or in the vertical direction.

  Next, an inverter device according to a second embodiment provided with the output side connection structure of the second invention will be described with reference to FIGS. The inverter device of the second embodiment includes a total of four single-phase inverter units 101 (101A to 101D), and these u-phase output and v-phase output are respectively connected in parallel. More specifically, two single-phase inverter units 101 are connected in parallel as one set, and then two sets of single-phase inverter units 101 are connected in parallel to each other.

  FIG. 10 is a circuit diagram showing a circuit configuration of the inverter device. As shown in the figure, the u output terminals of the two single-phase inverter units 101A and 101B forming one set are connected in parallel to each other, and the v output terminals are connected in parallel to each other. Similarly, u output terminals of two single-phase inverter units 101C and 101D forming another set are connected in parallel to each other, and v output terminals are connected in parallel to each other. Then, after the u-phase output of the first set and the u-phase output of the second set are connected in parallel, the u-phase output of the final device is drawn out. Similarly, the first set of v-phase outputs and the second set of v-phase outputs are connected in parallel, and the final v-phase output of the device is extracted. The input sides of the four single-phase inverter units 101A to 101D are connected in parallel to the DC power supplies P and N.

  As shown in FIG. 10, each single-phase inverter unit 101 (101 </ b> A to 101 </ b> D) includes two IGBT modules 111 and 112 and a smoothing capacitor 113 as switching element modules. The IGBT module 111 includes two switching circuits S1 and S2 serving as an upper arm and a lower arm, and a u output terminal is drawn from an intermediate connection point. Similarly, the IGBT module 112 includes two switching circuits S3 and S4, and the v output terminal is drawn from the intermediate connection point.

  For ease of understanding, reference numerals such as corresponding conductors to be described later are attached to the wiring and the like in the circuit diagram of FIG.

  As a specific configuration of the single-phase inverter unit 101, as shown in FIG. 9 and the like, IGBT modules 111 and 112 are respectively arranged on both surfaces of the heat sink 103 with a central heat sink 103 made of a rectangular metal block interposed therebetween. Three terminals are provided on the top surfaces of the IGBT modules 111 and 112, respectively. Specifically, the IGBT module 111 includes a P input terminal 115, an N input terminal 116, and a u output terminal 117 (see FIG. 7). The IGBT module 112 includes a P input terminal 115, an N input terminal 116, and a v input terminal 115. An output terminal 118 is provided. Therefore, as the single-phase inverter unit 101, the u output terminal 117 and the v output terminal 118 are disposed on the opposite surfaces. Of the three terminals of each IGBT module 111, 112, the N input terminal 116 is located in the center, and the P input terminal 115 and the u output terminal 117 or the v output terminal 118 are located on both sides thereof.

  Since the set of two single-phase inverter units 101A and 101B and the set of two single-phase inverter units 101C and 101D have basically the same configuration, in the following, the single-phase inverter units 101A and 101B The configuration will be described using a pair as an example.

  The two single-phase inverter units 101A and 101B are arranged side by side so that the u output terminals 117 and the v output terminals 118 are aligned in the same plane. Specifically, it is arranged in a posture rotated by 180 °. These two single-phase inverter units 101A and 101B are composed of three metal plates (u-phase first conductor 121, u-phase second conductor 122, u-phase third conductor) provided for u output terminal 117. 123) and the three conductors (v-phase first conductor 131, v-phase second conductor 132, and v-phase third conductor 133) provided for the v output terminal 118, the output terminals are connected in parallel and physically Are integrally assembled.

  FIG. 9 is an exploded perspective view of a total of six conductors. As shown, the u-phase first conductor 121 and the v-phase first conductor 131, the u-phase second conductor 122 and the v-phase second conductor 132. The u-phase third conductor 123 and the v-phase third conductor 133 have the same or similar shapes. The v-phase side conductor shown on the front side in FIG. 9 will be described first. The v-phase first conductor 131 has a flat rectangular plate shape in which terminal tabs 131a and 131b are cut out at both upper and lower ends. The terminal tabs 131a and 131b are fixed to the v output terminals 118 of the two single-phase inverter units 101A and 101B by screws 125, respectively. Accordingly, the v output terminals 118 of the two single-phase inverter units 101A and 101B are connected in parallel to each other via the v-phase first conductor 131.

  The v-phase second conductor 132 includes a rectangular planar portion 132a passing through a gap between the two single-phase inverter units 101A and 101B arranged above and below, and a single-phase inverter from the side edge of one end of the planar portion 132a. It has a bent portion 132b that is bent toward the unit 101A, that is, upward, and a bent portion 132c that is bent downward from the other end of the flat surface portion 132a. A terminal tab 132d that matches the terminal tab 131a of the v-phase first conductor 131 is notched in the bent portion 132b. The bent portion 132b is overlapped under the v-phase first conductor 131 (between the v-phase first conductor 131 and the IGBT module 112 of the single-phase inverter unit 101A), and the terminal tab 132d is the v-phase first conductor 131. The terminal tab 131a and the v output terminal 118 of the single-phase inverter unit 101A are fastened together by screws 125. The bent portion 132c is a portion that becomes the “v-phase second output terminal” in the claims, and includes a circular hole 132e.

  The v-phase third conductor 133 is overlapped with the flat portion 132a of the v-phase second conductor 132 and passes through a gap between the two single-phase inverter units 101A and 101B, and one end of the flat portion 133a. A bent portion 133b bent from the side edge of the portion toward the single-phase inverter unit 101B, that is, downward, and a bent portion 133c also bent downward from the other end of the flat portion 133a. A terminal tab 133d that matches the terminal tab 131b of the v-phase first conductor 131 is notched in the bent portion 133b. The bent portion 133b is overlapped under the v-phase first conductor 131 (between the v-phase first conductor 131 and the IGBT module 112 of the single-phase inverter unit 101B), and the terminal tab 133d is the v-phase first conductor 131. The terminal tab 131b and the v output terminal 118 of the single-phase inverter unit 101B are fastened together by screws 125. The bent portion 133c is a portion that overlaps with the bent portion 132c of the v-phase second conductor 132 to become the “v-phase second output terminal” in the claims, and also includes a corresponding circular hole 133e.

  In this manner, in the state where the three conductors 131, 132, 133 are combined, the bent portion 132c between the two v output terminals 118, and each v output terminal 118 and the “v phase second output terminal”. , 133c, the circuit wiring is configured in such a manner that two conductors overlap each other. As a result, the wiring inductances for the two v output terminals 118 are equivalent, and the energization cross-sectional area is large and equivalent.

  Like the v-phase first conductor 131, the u-phase first conductor 121 has a flat rectangular plate shape in which terminal tabs 121a and 121b are notched at both upper and lower ends, and the terminal tabs 121a and 121b have two pieces. The u-phase output terminals 117 of the single-phase inverter units 101A and 101B are fixed by screws 125, respectively. Accordingly, the u output terminals 117 of the two single-phase inverter units 101A and 101B are connected in parallel to each other via the u-phase first conductor 121.

  Similar to the v-phase second conductor 132, the u-phase second conductor 122 has a rectangular plane portion 122a passing through the gap between the two single-phase inverter units 101A and 101B, and a side of one end portion of the plane portion 122a. It has a bent portion 122b bent from the edge to the single-phase inverter unit 101A side, that is, upward, and a bent portion 122c also bent upward from the other end of the flat surface portion 122a. The bent portion 122 b has a terminal tab 122 d that matches the terminal tab 121 a of the u-phase first conductor 121, and is fastened to the u output terminal 117 in a state of overlapping the u-phase first conductor 121. The bent portion 122c is a portion that becomes the “u-phase second output terminal” in the claims, and includes a circular hole 122e.

  Similar to the v-phase third conductor 133, the u-phase third conductor 123 overlaps the planar portion 122a of the u-phase second conductor 122 and passes through a gap between the two single-phase inverter units 101A and 101B. Portion 123a, a bent portion 123b bent from the side edge of one end portion of the flat portion 123a toward the single-phase inverter unit 101B, that is, downward, and a bent portion 123c bent upward from the other end of the flat portion 123a. And have. The bent portion 123 b has a terminal tab (not shown) that matches the terminal tab 121 b of the u-phase first conductor 121, and is fastened to the u output terminal 117 in a state of overlapping the u-phase first conductor 121. Has been. The bent portion 123c is a portion that is overlapped with the bent portion 122c of the u-phase second conductor 122 and becomes the “u-phase second output terminal” in the claims, and includes a circular hole 123e.

  As described above, in the state where the three conductors 121, 122, and 123 are combined, the bent portion 122c between the two u output terminals 117 and the u output terminals 117 and the “u-phase second output terminal”. , 123c, the circuit wiring is configured in such a manner that two conductors overlap each other. As a result, the wiring inductances for the two u output terminals 117 are equivalent, and the energization cross-sectional area is large and equivalent.

  Since the u-phase three conductors 121 to 123 and the v-phase three conductors 131 to 133 are substantially symmetrical, wiring inductance is equivalent between the u-phase and the v-phase.

  Here, the u-phase second conductor 122, the planar portions 122a and 123a of the third conductor 123, the v-phase second conductor 132, and the planar portions 132a and 133a of the third conductor 133 are both two single-phase inverters. Although extending to the front side of the inverter device through the gap between the units 101A and 101B, these four flat portions are overlapped with each other via an insulating plate 126 that insulates between the u phase and the v phase. ing. Specifically, in order from the bottom, the v-phase third conductor 133, the second conductor 132, the insulating plate 126, the u-phase third conductor 123, and the second conductor 122 are sequentially overlapped. The conductor 133 and the insulating plate 126 may be in contact with each other without a gap, or there may be a very small gap. The four plane portions 122a, 123a, 132a, and 133a that are overlapped are along a plane that is orthogonal to the direction in which the two single-phase inverter units 101A and 101B are arranged.

  As described above, the plane portions 122a and 123a of the u-phase second conductor 122 and the third conductor 123 and the v-phase second conductor 132 and the plane portions 132a and 133a of the third conductor 133 overlap with each other over a wide area. Since a high-frequency current flows in the opposite direction, the same effect as the first embodiment can be obtained.

  The configuration on the output side of the two single-phase inverter units 101C and 101D as the other set is also exactly the same as described above, and includes the u-phase first conductor 121, the u-phase second conductor 122, the u-phase third conductor 123, and The output terminals are connected in parallel by the v-phase first conductor 131, the v-phase second conductor 132, and the v-phase third conductor 133, and at the same time are physically integrated.

  The “u-phase second output terminal” of each of the two sets of single-phase inverter units (101A, 101B) (101C, 101D) (that is, the bent portion 122c and the u-phase third of the u-phase second conductor 122). The bent portion 123c) of the conductor 123 is connected to each other by a u-phase fourth conductor 124 extending across the two sets. The u-phase fourth conductor 124 has a plane portion 124a extending along the same plane as the plane portion 123a and the like of the u-phase third conductor 123, and at one side edge of both ends in the longitudinal direction of the plane portion 124a. The bent portion 122c of the u-phase second conductor 122 and the bent portion 123c of the u-phase third conductor 123 and a pair of bent portions 124b fixed and connected via bolts and nuts 135, and a plane portion At the center in the longitudinal direction of the other side edge of 124a, there is a bent portion 124c that becomes the u-phase output terminal ("u-phase third output terminal" in the claims) of the final device.

  Similarly, the “v-phase second output terminal” of each of the two sets of single-phase inverter units (101A, 101B) (101C, 101D) (that is, the bent portion 132c of the v-phase second conductor 132 and the v-phase third The bent portion 133c) of the conductor 133 is connected to each other by a v-phase fourth conductor 134 extending across the two sets. The v-phase fourth conductor 134 has substantially the same shape as the u-phase fourth conductor 124 described above, and is combined with the u-phase fourth conductor 124 in a vertically inverted form. In other words, the v-phase fourth conductor 134 has a plane portion 134a, a pair of bent portions 134b, and a bent portion that becomes a v-phase output terminal (“v-phase third output terminal” in the claims) of the final device. 134c.

  Specifically, the u-phase fourth conductor 124 and the v-phase fourth conductor 134 have their planar portions 124a and 134a overlapped with each other via an insulating plate (not shown). Therefore, the u-phase fourth conductor 124 and the v-phase fourth conductor 134 also have a configuration in which two wide conductors through which high-frequency current flows in the opposite direction are superposed, thereby reducing self-inductance and leakage magnetic flux. .

  Further, as is apparent from FIG. 6, the u-phase output terminal 117 (folded portion 124c) and the v-phase output terminal ( Each conduction path up to the bent portion 134c) has the same length, and the conduction paths including the conduction cross-sectional area are substantially equal. Accordingly, the wiring inductance is equivalent. Also, there is no unnecessary detour to equalize each conduction path, and therefore the impedance is reduced.

  The configuration of the input side of the single-phase inverter unit 101 (101A to 101D) will be described. Each of the single-phase inverter units 101 is formed in a substantially U-shape so as to surround the outside of the single-phase inverter unit 101. A conductor 141 and an N-side conductor 142 are provided. The P-side conductor 141 and the N-side conductor 142 are overlapped via an insulating plate (not shown) so that the P-side conductor 141 is on the inside, and both ends of each pair constitute a single-phase inverter unit 101. The IGBT modules 111 and 112 are fixed and connected to the P input terminal 115 and the N input terminal 116, respectively. A pair of smoothing capacitors 113 are attached to the outer surface of the central side among the three sides bent so as to form a substantially U shape. As apparent from FIG. 10, the smoothing capacitor 113 constitutes a part of each single-phase inverter unit 101 as a circuit configuration, and is electrically connected between the P-side conductor 141 and the N-side conductor 142. It is connected.

  A P-side main input conductor 143 and an N-side main input conductor 144 are formed in a square frame shape on the back surface of the entire inverter device including the four single-phase inverter units 101 (101A to 101D). The P-side conductor 141 and the N-side conductor 142 of the inverter unit 101 are connected to the P-side main input conductor 143 and the N-side main input conductor 144, respectively. The P-side main input conductor 143 and the N-side main input conductor 144 partially overlap with each other through an insulating plate (not shown), and the P-side main input terminal portion 143a and the N-side main input terminal portion 144a are provided at the ends. Each has.

  Therefore, in the second embodiment, the wiring path is substantially equivalent for each of the four single-phase inverter units 101 on the input side.

DESCRIPTION OF SYMBOLS 1 (1A-1F) ... Single phase inverter unit 2 ... Base 3 ... Matching transformer 11, 12 ... IGBT module 13 ... Smoothing capacitor 21 ... u output terminal 22 ... v output terminal 23 ... P input terminal 24 ... N input terminal 31 ... 1st conductor 32 ... 2nd conductor 33 ... 3rd conductor 41 ... Plane part 42, 43 ... Bending part 44 ... Plane part 45, 46 ... Bending part 46a ... u phase device output terminal 47 ... Plane part 48, 49 ... Bending portion 49a ... v phase device output terminal 50 ... insulating plate 101 (101A to 101D) ... single phase inverter unit 103 ... heat sink 111, 112 ... IGBT module 113 ... smoothing capacitor 117 ... u output terminal 118 ... v output terminal 121 ... u-phase first conductor 122... u-phase second conductor 122 a... plane portion 123... u-phase third conductor 123 a. 124a ... flat portion 126: insulating plate 131 ... v phase first conductor 132 ... v-phase second conductors 132a ... flat portion 133 ... v-phase third conductor 133a ... flat portion 134 ... v-phase fourth conductor 134a ... planar portion

Claims (6)

It includes n first single-phase inverter units connected in parallel and n second single-phase inverter units connected in parallel, and these are arranged in a matrix of “2 rows × n columns”. In addition, each single-phase inverter unit includes a plurality of single-phase inverter units each having a u output terminal and a v output terminal positioned side by side in the column direction of the matrix;
The u output terminal or v output terminal of the first single-phase inverter unit adjacent to each other in the column direction of the matrix and the v output terminal or u output terminal of the second single-phase inverter unit are connected in series. The n output terminals along the row direction of the matrix are connected to each other so that the n output terminals having a length over both output terminals along the column direction and arranged in the row direction of the matrix are connected to each other. A plate-like first conductor having a width across;
The other output terminals of the n first single-phase inverter units have a width equal to the first conductor along the row direction of the matrix and are connected to the first conductor via an insulating plate so as to be connected to each other. A plate-like second conductor that extends to an intermediate part in the column direction of the matrix and whose tip part constitutes one of the device output terminals;
The other output terminals of the n second single-phase inverter units have the same width as the first conductor along the row direction of the matrix and connect the other output terminals of the n second single-phase inverter units with the insulating plate interposed therebetween. And a plate-like third conductor that extends to the middle part in the column direction of the matrix and whose tip part constitutes the other of the device output terminals,
An output side connection structure of a single-phase inverter comprising: The n first single-phase inverter units are arranged in the upper stage of the gantry, and the n second single-phase inverter units are arranged in the lower stage of the gantry,
Each single-phase inverter unit has a u output terminal and a v output terminal on the front surface, and the u output terminal is positioned relatively above the v output terminal,
The first conductor is connected to n v output terminals of the first single-phase inverter unit located in the upper stage and n u output terminals of the second single-phase inverter unit located in the lower stage.
The output side connection structure of the single phase inverter according to claim 1. The first conductor is a rectangular flat plate-shaped central plane portion, and is bent from both ends of the plane portion so as to form an L-shaped cross section, so that the first single-phase inverter unit and the second single-phase inverter unit Each having a bent portion connected to n output terminals,
The second conductor includes a flat plate portion having a rectangular plate shape that is substantially half the size of the flat portion of the first conductor, and is bent from the end of the flat portion so as to form an L-shaped cross section. A bent portion connected to the n output terminals of the phase inverter unit,
The third conductor has a rectangular plate shape that is approximately half the size of the flat portion of the first conductor, and is bent from one end of the flat portion so as to form an L-shaped cross section. A bent portion connected to the n output terminals of the phase inverter unit,
The output side connection structure of the single phase inverter of Claim 1 or 2. a first single-phase inverter unit having u output terminals and v output terminals on opposite sides, and a second single-phase inverter unit having u output terminals and v output terminals on opposite sides, respectively. And a set of single-phase inverter units arranged side by side so that the u output terminals and the v output terminals are located on the same plane,
A plate-like u-phase first conductor extending across the u output terminal of the first single-phase inverter unit and the u output terminal of the second single-phase inverter unit so as to connect to each other;
Having a flat portion passing through the gap between the first single-phase inverter unit and the second single-phase inverter unit, and having a bent portion bent from the flat portion toward the first single-phase inverter unit, A plate-like u-phase second conductor in which the bent portion overlaps with the u-phase first conductor and is fixed to the u output terminal of the first single-phase inverter unit, and one end of the plane portion becomes the u-phase second output terminal. When,
The planar portion of the u-phase second conductor overlaps with the planar portion and passes through the gap between the first single-phase inverter unit and the second single-phase inverter unit. A bent portion that is bent toward the inverter unit side, the bent portion overlaps with the u-phase first conductor and is fixed to the u output terminal of the second single-phase inverter unit, and one end of the plane portion is the u-phase A plate-shaped u-phase third conductor that becomes a u-phase second output terminal together with one end of the second conductor;
A plate-like v-phase first conductor extending across the first single-phase inverter unit and the second single-phase inverter unit so as to connect the v-output terminal and the v-output terminal of the second single-phase inverter unit;
The planar portion of the u-phase second conductor and u-phase third conductor overlaps with the planar portion and passes through the gap between the first single-phase inverter unit and the second single-phase inverter unit. A bent portion bent toward the first single-phase inverter unit, and the bent portion overlaps with the v-phase first conductor and is fixed to the v output terminal of the first single-phase inverter unit; A plate-like v-phase second conductor having one end serving as a v-phase second output terminal;
A planar portion passing through the gap between the first single-phase inverter unit and the second single-phase inverter unit, overlapping the planar portions of the u-phase second conductor, u-phase third conductor and v-phase second conductor; And having a bent portion bent from the planar portion toward the second single-phase inverter unit, and the bent portion overlaps with the v-phase first conductor and serves as the v output terminal of the second single-phase inverter unit. A plate-shaped u-phase third conductor that is fixed and has one end of the flat surface portion serving as a v-phase second output terminal together with one end of the v-phase second conductor;
An insulating plate interposed between the plane portions of the u-phase second conductor and the u-phase third conductor and the plane portions of the v-phase second conductor and the v-phase third conductor;
An output side connection structure of a single-phase inverter comprising: Two sets of the first single-phase inverter unit and the second single-phase inverter unit are provided, and the two single-phase inverter units of the first set and the two single-phase inverter units of the second set are in parallel. Has been placed,
further,
A plate-like u-phase fourth conductor that connects the first set of u-phase second output terminals and the second set of u-phase second output terminals to each other and has a u-phase third output terminal in the center; ,
A plate-like v-phase fourth conductor that connects the first set of v-phase second output terminals and the second set of v-phase second output terminals to each other and has a v-phase third output terminal in the center; ,
With
The u-phase fourth conductor and the v-phase fourth conductor are overlapped via an insulating plate.
The output side connection structure of the single phase inverter of Claim 4. The single-phase inverter unit is composed of a pair of switching element modules respectively disposed on both surfaces of the heat sink with a central heat sink therebetween.
Each switching element module includes two switching circuits, one switching element module has a u output terminal, and the other switching element module has a v output terminal.
The output side connection structure of the single phase inverter of Claim 4 or 5.

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