JP6950804B2 - Output side connection structure of single-phase inverter - Google Patents

Description

The present invention relates to an output side connection structure using a conductor when the AC output sides of a plurality of single-phase inverter units are connected in parallel to form a circuit in a high-frequency power supply device.

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

Japanese Unexamined Patent Publication No. 2012-105382

When the AC output sides of a plurality of single-phase inverter units are connected in parallel, the length of the conductor increases according to the number of connected single-phase inverter units, the inductance of the circuit becomes large, 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 flux to the outside is large, which causes problems such as heat generation due to induction heating of surrounding parts.

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 to reduce the leakage flux to the outside.

In Patent Document 1, the conductor serving as the AC output terminal is overlapped with the two plate-shaped conductors on the input side, but the effect of lowering the impedance and reducing the leakage flux cannot be obtained.

In the present invention, when the u output terminal and the v output terminal of a plurality of single-phase inverter units are connected in parallel by a plate-shaped conductor, the two plate-shaped conductors are widely overlapped so that high-frequency currents flow in opposite directions. Constitute. As a result, the action of canceling the self-inductance between the two conductors can be greatly obtained, and the impedance can be reduced. Further, since the current always flows in the opposite directions through the two conductors, the leakage flux is reduced.

That is, the output side connection structure of the single-phase inverter according to the present invention is
A first single-phase inverter unit having u-output terminals and v-output terminals on opposite surfaces, and a second single-phase inverter unit having u-output terminals and v-output terminals on opposite surfaces. , 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-shaped u-phase first conductor extending over both to connect the u-output terminal of the first single-phase inverter unit and the u-output terminal of the second single-phase inverter unit to each other.
It has a flat portion that passes through the gap between the first single-phase inverter unit and the second single-phase inverter unit, and also has a bent portion that is bent from this flat portion to the first single-phase inverter unit side. A plate-shaped u-phase second conductor in which this 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 flat portion serves as the u-phase second output terminal. When,
It has a flat surface portion that overlaps the flat surface portion of the u-phase second conductor and passes through a gap between the first single-phase inverter unit and the second single-phase inverter unit, and has a flat surface portion from this flat surface portion to the second single-phase. It has a bent portion that is bent toward the inverter unit side, and this 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 flat surface portion is the above u-phase. A plate-shaped u-phase third conductor that serves as a u-phase second output terminal together with one end of the second conductor,
A plate-shaped v-phase first conductor extending over both to connect the v-output terminal of the first single-phase inverter unit and the v-output terminal of the second single-phase inverter unit to each other.
It has a flat surface portion that overlaps the flat surface portions of the u-phase second conductor and the u-phase third conductor and passes through a gap between the first single-phase inverter unit and the second single-phase inverter unit, and from this flat surface portion. It has a bent portion that is bent toward the first single-phase inverter unit, and this bent portion overlaps with the v-phase first conductor and is fixed to the v output terminal of the first single-phase inverter unit, and is a flat portion. A plate-shaped v-phase second conductor whose one end serves as a v-phase second output terminal,
A flat surface portion that overlaps the flat surface portion of the u-phase second conductor, the u-phase third conductor, and the v-phase second conductor and passes through a gap between the first single-phase inverter unit and the second single-phase inverter unit. It also has a bent portion that is bent from this flat surface portion to the second single-phase inverter unit side, and this 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 v- phase third conductor whose flat surface portion is fixed and whose one end serves as a v-phase second output terminal together with one end of the v-phase second conductor.
An insulating plate interposed between the flat surface portion of the u-phase second conductor and the u-phase third conductor and the flat surface portion of the v-phase second conductor and the v-phase third conductor.
It is configured with.

In this configuration, the u output terminals of the single-phase inverter unit, which is a set of two, 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. Will be done. Then, the u output connected in parallel is drawn out through between the two single-phase inverter units via the u-phase second conductor and the u-phase third conductor, and the v output similarly connected in parallel is the v-phase second conductor. It is drawn through between the two single-phase inverter units via a conductor and a v-phase third conductor. The plane portions of the u-phase second conductor, the u-phase third conductor, the v-phase second conductor, and the v-phase third conductor are overlapped with each other. Therefore, the high-frequency current flows in the opposite directions between the u-phase second and third conductors and the v-phase second and third conductors, so that the inductance is reduced and the leakage flux is suppressed.

Further, in one aspect of the present 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 arranged in parallel. Have been placed and
Moreover,
A plate-shaped 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-shaped 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 4th conductor and the v-phase 4th conductor overlap each other via an insulating plate.

In this configuration, the u output terminals of a total of four single-phase inverter units are connected in parallel, and the v output terminals are similarly connected in parallel. Since the u-phase fourth conductor, which is the final u-phase output terminal, and the v-phase fourth conductor, which is the final v-phase output terminal, overlap each other, the high-frequency current also flows in the opposite direction in this portion. The inductance can be reduced and the leakage flux can be reduced.

In one specific embodiment, the single-phase inverter unit comprises a pair of switching element modules arranged on both sides of the heat sink with a central heat sink in between.
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-shaped conductors on the AC output side of the single-phase inverter are combined so that a high-frequency current flows in opposite directions and are overlapped so as to be in wide contact with each other. Can be obtained greatly, and the impedance can be reduced. In addition, the leakage flux is reduced, and heat generation due to induction heating of surrounding parts is suppressed.

FIG. 3 is a perspective view of the entire inverter device of the embodiment provided with the output side connection structure according to the present invention. The front view which shows the structure of one set of single-phase inverter units. A side view showing the configuration of one set of single-phase inverter units. An exploded perspective view of a set of single-phase inverter units and each conductor. The circuit diagram which shows the circuit structure of the inverter device of an Example.

Hereinafter, an inverter device according to an embodiment having an output side connection structure according to the present invention will be described with reference to FIGS. 1 to 5. The inverter device of this embodiment includes a total of four single-phase inverter units 101 (101A to 101D), and these u-phase outputs and v-phase outputs are connected in parallel, respectively. More specifically, the two single-phase inverter units 101 are connected in parallel as one set, and then the two sets of single-phase inverter units 101 are connected in parallel to each other.

FIG. 5 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 to each other in parallel to each other. Similarly, the u output terminals of the two single-phase inverter units 101C and 101D forming another set are connected in parallel to each other, and the v output terminals are connected to each other in parallel. Then, the u-phase output of the first set and the u-phase output of the second set are connected in parallel, and then the u-phase output of the final device is drawn out. Similarly, the v-phase output of the first set and the v-phase output of the second set are connected in parallel, and then the v-phase output of the final device is drawn out. The input side of each of the four single-phase inverter units 101A to 101D is connected in parallel to the DC power supplies P and N.

As shown in FIG. 5, each single-phase inverter unit 101 (101A to 101D) 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 that serve as an upper arm and a lower arm, and a u output terminal is drawn out from an intermediate connection point thereof. Similarly, the IGBT module 112 includes two switching circuits S3 and S4, and a v output terminal is drawn out from an intermediate connection point thereof.

For ease of understanding, the wiring and the like in the circuit diagram of FIG. 5 are designated by reference numerals such as the corresponding conductors described later.

As a specific configuration of the single-phase inverter unit 101, as shown in FIG. 4 and the like, the IGBT modules 111 and 112 are arranged on both sides of the central heat sink 103 made of a rectangular metal block, respectively. 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. 2), and the IGBT module 112 has a P input terminal 115, an N input terminal 116, and v. It has an output terminal 118. Therefore, in the single-phase inverter unit 101, the u output terminal 117 and the v output terminal 118 are arranged on opposite surfaces. In each of the three terminals of the IGBT modules 111 and 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 of the N input terminal 116.

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

The two single-phase inverter units 101A and 101B are arranged one above the other so that the u output terminals 117 and the v output terminals 118 are arranged in the same plane. Specifically, it is arranged in a posture rotated by 180 °. These two single-phase inverter units 101A and 101B are conductors made of three metal plates provided for the u output terminal 117 (u-phase first conductor 121, u-phase second conductor 122, u-phase third conductor). 123) and the three conductors provided for the v output terminal 118 (v-phase first conductor 131, v-phase second conductor 132, v-phase third conductor 133) connect the output terminals in parallel and at the same time physically. Assembled together.

FIG. 4 is an exploded perspective view of the above-mentioned six conductors, and 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 to each other. Explaining first about the conductor on the v-phase side shown on the front side in FIG. 4, the v-phase first conductor 131 has a flat rectangular plate shape in which terminal tabs 131a and 131b are notched 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. Therefore, 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 is a rectangular flat surface portion 132a passing through a gap between two single-phase inverter units 101A and 101B arranged one above the other, and a single-phase inverter from a side edge of one end of the flat surface portion 132a. It has a bent portion 132b that is bent upward, that is, toward the unit 101A, 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 superposed 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 has the v-phase first conductor 131. The terminal tab 131a of the single-phase inverter unit 101A is fastened together with the v output terminal 118 of the single-phase inverter unit 101A by a screw 125. The bent portion 132c is a portion that serves as the “v-phase second output terminal” in the claim, and includes a circular hole 132e.

The v-phase third conductor 133 is a rectangular flat surface portion 133a that overlaps the flat surface 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 surface portion 133a. It has a bent portion 133b that is bent downward from the side edge of the unit toward the single-phase inverter unit 101B, and a bent portion 133c that is also bent downward from the other end of the flat surface 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 superposed 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 has the v-phase first conductor 131. The terminal tab 131b of the single-phase inverter unit 101B is fastened together with the v output terminal 118 of the single-phase inverter unit 101B by a screw 125. The bent portion 133c is a portion that is superimposed on the bent portion 132c of the v-phase second conductor 132 and becomes the “v-phase second output terminal” in the claim, and also has a corresponding circular hole 133e.

In this way, in the state where the three conductors 131, 132, and 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” is formed. , 133c, the circuit wiring is configured in the form in which two conductors are overlapped with each other. As a result, the wiring inductances for the two v output terminals 118 are equivalent, and the energization cross-sectional area is secured to be large and equal.

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 has two terminal tabs 121a and 121b. The single-phase inverter units 101A and 101B are fixed to the u output terminals 117 by screws 125, respectively. Therefore, 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.

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

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

In this way, when the three conductors 121, 122, and 123 are combined, the bent portion 122c between the two u output terminals 117 and each u output terminal 117 and the "u phase second output terminal" is formed. , 123c, the circuit wiring is configured in the form 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 secured to be large and equal.

Since the three u-phase conductors 121 to 123 and the three v-phase conductors 131 to 133 are configured substantially symmetrically, the wiring inductances are equivalent between the u-phase and the v-phase.

Here, the u-phase second conductor 122, the plane portions 122a, 123a of the third conductor 123, the v-phase second conductor 132, and the plane portions 132a, 133a of the third conductor 133 are all two single-phase inverters. It extends to the front side of the inverter device through the gap between the units 101A and 101B, and these four flat surfaces are superposed on each other via an insulating plate 126 that insulates between the u phase and the v phase. ing. Specifically, 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 in this order from the bottom. The conductor 133 and the like and the insulating plate 126 may be in contact with each other without a gap, or may have a very small gap. The four overlapping plane portions 122a, 123a, 132a, and 133a are along a plane orthogonal to the direction in which the two single-phase inverter units 101A and 101B are arranged.

In this way, the plane portions 122a and 123a of the u-phase second conductor 122 and the third conductor 123 and the plane portions 132a and 133a of the v-phase second conductor 132 and the third conductor 133 overlap each other over a wide area. Since a high-frequency current flows in the opposite direction, the following effects can be obtained.

That is, the high-frequency current flows in the opposite direction, so that the self-inductances cancel each other out and the leakage flux is reduced. In particular, in the above configuration, the conductors 122, 123, 132, and 133 are wide and the area where they overlap each other (particularly, the area where the high frequency current flows in the opposite direction) is large. Therefore, the effect of canceling the self-inductance between the conductors becomes large. In addition, due to the skin effect, a larger current flows near the skin of each conductor 122, 123, 132, 133, but high-frequency current flows in the opposite direction near the skin between the two conductors that overlap widely, so the above effects and effects Is obtained larger. By reducing the leakage flux, the influence on the surrounding parts is suppressed, and for example, a shielding plate becomes unnecessary.

Further, since each of the wide conductors 122, 123, 132, and 133 has a large cross-sectional area, a sufficient energizing cross-sectional area can be secured even if the energizing cross-sectional area is substantially reduced due to the skin effect. The heat generation in 122, 123, 132, 133 is suppressed. Therefore, for example, in the above inverter device, the conductors 122, 123, 132, and 133 can be air-cooled without being liquid-cooled.

The configuration on the output side of the other pair of two single-phase inverter units 101C and 101D is exactly the same as above, and the u-phase first conductor 121, u-phase second conductor 122, 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 are physically integrally assembled at the same time.

Then, the "u-phase second output terminal" of each of these 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 over two sets. The u-phase fourth conductor 124 has a flat surface portion 124a extending along the same plane as the flat surface portion 123a of the u-phase third conductor 123, and has a flat surface portion 124a on one side edge of both ends in the longitudinal direction of the flat surface portion 124a. It has a pair of bent portions 124b fixed and connected to the bent portion 122c of the u-phase second conductor 122 and the bent portion 123c of the u-phase third conductor 123 via bolts and nuts 135, and further has a flat surface portion. At the center of the other side edge of 124a in the longitudinal direction, there is a bent portion 124c that serves as a u-phase output terminal (“u-phase third output terminal” in the claim) of the final device.

Similarly, the "v-phase second output terminal" (that is, the bent portion 132c and the v-phase third of the v-phase second conductor 132) of each of the two sets of single-phase inverter units (101A, 101B) (101C, 101D). The bent portion 133c) of the conductor 133) is connected to each other by a v-phase fourth conductor 134 extending across two sets. The v-phase fourth conductor 134 has substantially the same shape as the above-mentioned u-phase fourth conductor 124, and is combined with the u-phase fourth conductor 124 in an upside-down form. That is, the v-phase fourth conductor 134 is a flat portion 134a, a pair of bent portions 134b, and a bent portion that serves as a v-phase output terminal (“v-phase third output terminal” in the claim) of the final device. It has 134c and.

In the u-phase fourth conductor 124 and the v-phase fourth conductor 134, in detail, the plane portions 124a and 134a of both are 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 a high-frequency current flows in opposite directions are superposed, so that self-inductance can be reduced and leakage flux can be reduced. ..

Further, as is clear from FIG. 1, from the u output terminal 117 and v output terminal 118 of the four single-phase inverter units 101 to the u-phase output terminal (bent portion 124c) and v-phase output terminal (bent portion 124c) of the final device. Each conduction path up to the bent portion 134c) has the same length, and each conduction path including the current-carrying cross-sectional area is substantially the same. Therefore, the wiring inductances are equivalent. Also, there are no unnecessary detours to equalize each conduction path, thus reducing impedance.

Explaining the configuration of the input side of the single-phase inverter unit 101 (101A-101D), each of the single-phase inverter units 101 is bent into a substantially U shape so as to surround the outside of the single-phase inverter unit 101 on the P side. It includes a conductor 141 and an N-side conductor 142. The P-side conductor 141 and the N-side conductor 142 are superposed so that the P-side conductor 141 is on the inside via an insulating plate (not shown), and both ends thereof form a pair of single-phase inverter units 101. It is fixed and connected to the P input terminal 115 and the N input terminal 116 of the IGBT modules 111 and 112, respectively. A pair of smoothing capacitors 113 are attached to the outer surface of the central side of the three sides bent so as to form a substantially U shape. As is clear from FIG. 5, 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.

On the back surface of the entire inverter device including the four single-phase inverter units 101 (101A to 101D), a P-side main input conductor 143 and an N-side main input conductor 144 are configured in a square frame shape, and each single-phase 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 each other via an insulating plate (not shown), and the P-side main input terminal portion 143a and the N-side main input terminal portion 144a are attached to the ends. Each has.

Therefore, in this embodiment, the wiring paths of each of the four single-phase inverter units 101 on the input side are substantially equivalent.

101 (101A-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 122a ... Flat part 123 ... u-phase third conductor 123a ... Flat part 124 ... u-phase fourth conductor 124a ... Flat part 126 ... Insulating plate 131 ... v-phase first conductor 132 ... v-phase second conductor 132a ... Flat part 133 ... v-phase Third conductor 133a ... Flat surface portion 134 ... v-phase Fourth conductor 134a ... Flat surface portion

Claims (3)

A first single-phase inverter unit having a u-output terminal and a v-output terminal on opposite surfaces, and a second single-phase inverter unit having u-output terminals and v-output terminals on opposite surfaces. , 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-shaped u-phase first conductor extending over both to connect the u-output terminal of the first single-phase inverter unit and the u-output terminal of the second single-phase inverter unit to each other.
It has a flat portion that passes through the gap between the first single-phase inverter unit and the second single-phase inverter unit, and also has a bent portion that is bent from this flat portion to the first single-phase inverter unit side. A plate-shaped u-phase second conductor in which this 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 flat portion serves as the u-phase second output terminal. When,
It has a flat surface portion that overlaps the flat surface portion of the u-phase second conductor and passes through a gap between the first single-phase inverter unit and the second single-phase inverter unit, and has a flat surface portion from this flat surface portion to the second single-phase. It has a bent portion that is bent toward the inverter unit side, and this 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 flat surface portion is the above u-phase. A plate-shaped u-phase third conductor that serves as a u-phase second output terminal together with one end of the second conductor,
A plate-shaped v-phase first conductor extending over both to connect the v-output terminal of the first single-phase inverter unit and the v-output terminal of the second single-phase inverter unit to each other.
It has a flat surface portion that overlaps the flat surface portions of the u-phase second conductor and the u-phase third conductor and passes through a gap between the first single-phase inverter unit and the second single-phase inverter unit, and from this flat surface portion. It has a bent portion that is bent toward the first single-phase inverter unit, and this bent portion overlaps with the v-phase first conductor and is fixed to the v output terminal of the first single-phase inverter unit, and is a flat portion. A plate-shaped v-phase second conductor whose one end serves as a v-phase second output terminal,
A flat surface portion that overlaps the flat surface portion of the u-phase second conductor, the u-phase third conductor, and the v-phase second conductor and passes through a gap between the first single-phase inverter unit and the second single-phase inverter unit. It also has a bent portion that is bent from this flat surface portion to the second single-phase inverter unit side, and this 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 v- phase third conductor whose flat surface portion is fixed and whose one end serves as a v-phase second output terminal together with one end of the v-phase second conductor.
An insulating plate interposed between the flat surface portion of the u-phase second conductor and the u-phase third conductor and the flat surface portion of the v-phase second conductor and the v-phase third conductor.
Output side connection structure of a single-phase inverter equipped with. 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 arranged in parallel. Have been placed and
Moreover,
A plate-shaped 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-shaped 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 4th conductor and the v-phase 4th conductor overlap each other via an insulating plate.
The output side connection structure of the single-phase inverter according to claim 1. The single-phase inverter unit comprises a pair of switching element modules arranged on both sides of the heat sink with a central heat sink in between.
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 according to claim 1 or 2.

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