JP4550538B2 - Power converter - Google Patents

Description

  The present invention relates to a power converter for driving and controlling an electric motor of an elevator.

  In general, a power converter including an inverter for driving and controlling an electric motor of an elevator is configured as shown in FIG. That is, the power converter includes a three-phase AC power source 1, a converter 2 that converts AC power of the three-phase AC power source 1 into predetermined DC power, and a smoothing capacitor 3 that smoothes the DC power converted by the converter 2. And a switching element such as an IGBT (Insulated Gate Bipolar Transistor), which performs switching control based on a switching control signal from a control circuit (not shown), and converts the DC power smoothed by the smoothing capacitor 3 into predetermined AC power. It is comprised with the inverter 5 which drives and controls the electric motor 4 which converts and comprises the elevator hoisting machine.

  Inverter 5 includes switching elements 5u1-5u2, 5v1-5v2, 5w1-5w2 of U-phase, V-phase, and W-phase, such as two IGBTs, connected by bus bars such as copper, respectively, and the positive side of smoothing capacitor 3 Similarly, the positive terminals of the switching elements 5u1, 5v1, 5w1, the negative side of the smoothing capacitor 3, and the negative terminals of the switching elements 5u2, 5v2, 5w2 are also connected by bus bars.

  Further, a snubber circuit 6 as shown in FIG. 5 is connected to each phase switching element 5u1-5u2, 5v1-5v2, 5w1-5w2 (Non-patent Document 1). FIG. 5 shows a snubber circuit 6 applied to one phase, for example, the U phase. In the snubber circuit 6, the inductance of the conductive bar connecting the positive and negative sides of the smoothing capacitor 3 and the positive and negative terminals of the switching elements 5u1 and 5u2 increases, and accordingly, the switching elements 5u1 and 5u2 are generated when the switching elements 5u1 and 5u2 are turned off. It is provided to eliminate the surge voltage. Therefore, the snubber circuit 6 includes a capacitor 7 that accumulates the surge voltage generated from the two U-phase switching elements 5u1 and 5u2, a resistor 8 that consumes the surge voltage accumulated in the capacitor 7, and a flow direction of the surge current. The directional element 9 is defined.

  By the way, conventionally, various parts constituting the inverter 5 are arranged as shown in FIG. In the figure, reference numeral 11 denotes a cooling fin formed in, for example, an aluminum material in a comb-tooth shape, and 3,... Are smoothing capacitors erected in the vicinity of the right side portion of the cooling fin 11 in the figure. Since the smoothing capacitors 3 need to be replaced according to their lifetimes, they are installed at locations away from the cooling fins 11. In addition, switching elements 5u1, 5v1, 5w1, 5u2, 5v2, and 5w2 such as IGBTs are disposed on the insulating layer formed on the cooling fin 11 or on the cooling fin 11 via the insulating plate 12 or the like.

  13a is a bus bar connecting the positive side of the smoothing capacitors 3,... And the positive side terminals of the switching elements 5u1, 5v1, 5w1, and 13b is the negative side of the smoothing capacitors 3,... And the positive side of the switching elements 5u2, 5v2, 5w2. It is a bus bar that connects the terminal. The bus bars 13a and 13b are each formed in an L shape and are arranged to face each other at a predetermined distance in opposite directions. Conventionally, an insulating member is interposed in the gap between the opposing surfaces of the bus bars 13a and 13b. However, since the insulating member is expensive, in recent years, the two bus bars 13a and 13b are not provided without the insulating member. It is used in a state where the distance between the opposite surfaces is sufficiently separated.

  Further, recently, in order to connect the positive and negative electrodes of the smoothing capacitors 3,... And the positive and negative terminals of the switching elements 5u1, 5u2, 5v1, 5v2, 5w1, 5w2, as shown in FIG. There is one using a laminate substrate in which an insulating member 18 is sandwiched between two flat conductive bars 17a and 17b (Non-patent Document 1). When this laminate substrate is used, the conductive portion of the flat conductive bar 17a located in the lower layer is connected to the positive side terminal 19a of the switching elements 5u1, 5v1, and 5w1. Further, in order to connect the conductive portion of the flat plate conductive bar 17b located in the upper layer to the negative side terminal 19b of the switching elements 5u2, 5v2, 5w2, an opening is formed in the portion corresponding to the terminal 19b of the flat plate conductive bar 17a, and the upper layer is formed. The conductive portion of the flat plate conductive bar 17b located is connected to the negative terminal 19b of the switching elements 5u2, 5v2, 5w2 via the intermediate contact body 20.

As another conventional technique, one having the following configuration has been proposed (Patent Document 1).
In this prior art, all switching elements 5u1-5u2, 5v1-5v2, 5w1-5w2 constituting an inverter are modularized, and a plurality of smoothing capacitors are arranged on one side of the module. The positive terminals of the smoothing capacitors and the positive terminals of the switching elements are connected by a bus bar, and the negative terminals of the smoothing capacitors and the negative terminals of the switching elements are connected by a bus bar. Has been. As described above, the insulating plate is interposed between the two bus bars.

(Non-Patent Document 1)
Publication place: CQ Publishing Co., Ltd., Publication date: January 1, 2004, Journal name: Transistor technology SPECIAL, NO, 85 (see FIGS. 6-5 on pages 30 and 81) (Patent Document 1) JP 2003-319665 A (see FIG. 1)

Incidentally, the following problems have been pointed out in the conventional inverter 5 as described above.
(1) In the inverter 5 shown in FIG. 6, a plurality of smoothing capacitors 3,... Are arranged in the vicinity of one side of the cooling fin 11, and the positive side of the smoothing capacitors 3,... And the respective phase switching elements 5u1, 5v1, 5w1. The positive terminals of each other are connected by the bus bar 13a, and the negative electrode side of the smoothing capacitors 3,... And the negative terminals of the phase switching elements 5u2, 5v2, 5w2 are connected by the bus bar 13b. The W-phase switching elements 5w1, 5w2 close to ... are most susceptible to the heat of the smoothing capacitors 3,. Usually, since the switching elements 5u1, 5v1, and 5w1 of each phase are sequentially turned on / off, it is desirable that heat is evenly dissipated from at least the switching elements 5u1, 5v1, and 5w1. However, in the connection configuration of the smoothing capacitors 3,... And the bus bars 13a, 13b with the switching elements as described above, temperature variations occur at least between the switching elements 5u1, 5v1, 5w1, and the smoothing capacitors 3,. The distance from is also different. As a result, a certain switching element 5u1, 5v1, 5w1, 5u2, 5v2, 5w2 may be damaged when the temperature exceeds a certain temperature due to temperature variation. 4 is difficult to apply.

  Even when a laminate substrate as shown in FIG. 7 is used, the same problem occurs as long as a plurality of smoothing capacitors 3,.

(2) Further, as the bus bars 13a and 13b, relatively thin bars are used in terms of price, and bus bars 13a connecting the switching elements 5u1, 5v1, 5w1, 5u2, 5v2, 5w2 and the smoothing capacitors 3,. 13b becomes longer, the inductance of each of the bus bars 13a and 13b increases, and the surge voltage generated when the switching elements 5u1, 5v1, 5w1, 5u2, 5v2, and 5w2 constituting the main circuit element are turned on / off increases. There is.

  Therefore, as the snubber circuit 6, as shown in FIG. 5, it is necessary to reliably erase a large surge voltage by using a large number of circuit elements 7, 7, 8, 8, 9, and 9, and the circuit configuration is complicated. And there exists a problem which the whole structure of the inverter 5 enlarges.

(3) Further, as shown in FIG. 7, a laminate substrate is used for connection between the positive and negative sides of the smoothing capacitors 3,... And the positive and negative terminals 19a, 19b of the switching elements 5u1, 5u2, 5v1, 5v2, 5w1, 5w2. Since the intermediate contact body 20 is fixed to the surface portion of the flat conductive bar 17b located in the upper layer by welding, the workability is poor and the cost is high.

(4) Furthermore, as a technique of Patent Document 1, switching elements constituting three phases are completely modularized, but the internal configuration is not clear. In any case, when the switching elements 5u1, 5v1, 5w1, 5u2, 5v2, 5w2 are individually arranged as shown in FIG. 6, the smoothing capacitors 3,... And the switching elements 5u1, 5v1, 5w1, 5u2, 5v2 , 5w2 is not clear how to connect the bus bars. Further, since thin bars are used between the smoothing capacitor and the module, and the connection lines connecting these bars to the switching elements inside the module are also thin, it is difficult to significantly reduce the inductance. Furthermore, the fact that the inductance cannot be significantly reduced requires a large snubber circuit. Therefore, the same problem as in FIG. 6 occurs.

  This invention is made | formed in view of the above situations, and it aims at providing the power converter device which reduces the inductance of the connection line which connects a smoothing capacitor and each switching element.

  Moreover, this invention aims at simplification of a snubber circuit structure and providing the power converter device which contributes to size reduction of the whole inverter.

(1) In order to solve the above-mentioned problem, the present invention is a power conversion device in which an inverter in which a plurality of switching elements are connected in series for each phase is connected between a positive electrode side and a negative electrode side of a smoothing capacitor, A switching element arrangement means in which a plurality of switching elements of each phase are arranged from one end side to the other end side in a predetermined order on the cooling fin, and the direction perpendicular to the arrangement direction of the plurality of switching elements of each phase A smoothing capacitor array means arranged at substantially equal distances from the plurality of switching elements of each phase in the vicinity of the cooling fin end portion, and two flat conductive bars sandwiching an insulating plate. The negative side terminal of the switching element of the phase is connected by the one flat plate conductive bar, and the positive side of the smoothing capacitor and the positive side terminal of the switching element of each phase are connected to each other A power conversion device provided with a parallel-plate conductive bar connection means for connecting with the flat conductive bar.

According to the present invention, a smoothing capacitor is disposed on one side of a cooling fin that maintains a substantially equal distance from a plurality of switching elements for each phase, and a plurality of switching elements for each phase and the positive and negative sides of the smoothing capacitor are arranged. Since the positive and negative terminals are connected by a flat conductive bar (connection line), the heat radiation temperature of each switching element can be equalized and the inductance can be greatly reduced.
As the parallel plate conductive bar, an opening is formed in a predetermined portion of the flat plate conductive bar located in the lower layer, and the opening of the lower plate conductive bar is formed in a portion corresponding to the opening of the flat plate conductive bar located in the upper layer. And projecting the projecting portions from the positive and negative pole sides of the smoothing capacitor and connecting the terminals of the switching elements of the respective phases on the same pole side as the smoothing capacitor. Therefore, it is not necessary to weld a special intermediate contact body to the surface portion of the flat conductive bar, thereby improving workability and greatly contributing to cost reduction .

  As the parallel plate conductive bar connecting means, the flat plate conductive bar located in the lower layer is formed wide and the smoothing capacitor and the positive or negative side of the switching element of each phase arranged on the far side from the smoothing capacitor The flat plate conductive bar located in the upper layer is formed with a narrow width, and the smoothing capacitor is connected to the negative or positive terminal of the switching element of each phase arranged on the short distance side from the smoothing capacitor. Therefore, by connecting with a flat conductive bar having a larger area than that of the conventional bus bar, the same effects as described above can be obtained.

(2) Further, according to the present invention, if an intake fan for sucking radiated air is arranged on the side opposite to the smoothing capacitor with the cooling fin interposed therebetween in the configuration of the power converter as described above, The heat generation temperature generated from the capacitor and the heat radiation temperature of the plurality of switching elements for each phase can be uniformly sucked and exhausted, and the heat radiation temperature of the plurality of switching elements for each phase can be equalized.

(3) Further, according to the present invention, by adopting the configuration of the power conversion device described in the above (1), the inductance can be greatly reduced, and as a result, it spans a plurality of switching elements for each phase constituting the inverter. The function of the snubber circuit can be achieved only by connecting a capacitor to the capacitor, and the snubber circuit can be simplified.

  ADVANTAGE OF THE INVENTION According to this invention, the inductance of the connection line which connects a smoothing capacitor and each switching element can be reduced significantly, and the power converter device which can suppress significantly the surge voltage generated at the time of ON / OFF of a switching element can be provided.

  As a result, the configuration of the snubber circuit that eliminates the surge voltage can be simplified, and the overall inverter can be reduced in size.

  Hereinafter, an embodiment of the present invention will be described with reference to FIG.

  FIG. 1 is a configuration diagram showing an embodiment of a main part of a power conversion device according to the present invention. In the figure, the same components as those in the prior art will be described with the same reference numerals.

  First, the inverter 5 is not limited to the one having the configuration shown in FIG. 4 but includes inverters having various conventionally known configurations that are used to drive and control the electric motor of the elevator.

  In FIG. 1, the cooling fins 11 are, for example, those having a comb-tooth shape or a serpentine uneven shape made of an aluminum material. The cooling fin 11 holds the insulating layer by coating only the upper layer portion with an insulating material, or installs the insulating plate 12 or the like on the cooling fin 11.

  Then, the switching elements 5u1, 5v1, 5w1, 5u2, 5v2, 5w2 such as IGBTs themselves or modularized switching elements 5u1, 5v1, 5w1 are provided on the cooling fin 11 or on the cooling fin 11 via an insulating plate 12 or the like. , 5u2, 5v2, 5w2 are arranged. When the switching elements 5u1, 5v1, 5w1, 5u2, 5v2, and 5w2 are arranged, the switching elements 5u1, 5v1, and 5w1 of each phase are arranged in the order from the illustrated left end side to the right end side on the rear side on the cooling fin 11. Is done. Further, the switching elements 5u2, 5v2, and 5w2 in phase with the switching elements 5u1, 5v1, and 5w1 described above are arranged in the order from the illustrated left end side to the right end side on the front side on the cooling fin 11.

  Furthermore, smoothing capacitors 3,... Such as an aluminum electrolytic capacitor are arranged in the vicinity of one side surface of the cooling fin 11 that is perpendicular to the arrangement direction of the switching elements 5u1-5u2, 5v1-5v2, 5w1-5w2 for each phase. Yes. The reason why the smoothing capacitors 3,... Are arranged in a direction orthogonal to the arrangement direction of the switching elements of the respective phases is, for example, that the switching elements 5u1, 5v1, 5w1 of the respective phases having the positive side terminals and the respective phases having the negative side terminals. This is because the switching elements 5u2, 5v, 5w2 are configured to maintain a substantially equal distance relationship and receive the heat generation temperature generated from the smoothing capacitors 3,.

  Further, in order to connect, for example, the positive electrode side of the smoothing capacitors 3,... And the positive terminals of the switching elements 5u1, 5v1, 5w1 of the respective phases arranged on the upper rear side of the cooling fin 11, the wide surface portion is located in the lower layer. A flat conductive bar 22a made of copper, aluminum, or the like having a gap is disposed. Further, in order to connect, for example, the negative side of the smoothing capacitors 3,... And the negative side terminals of the switching elements 5u2, 5v2, 5w2 of the respective phases arranged on the front side of the upper portion of the cooling fin 11, the upper side of the flat conductive bar 22a. A flat plate conductive bar 22b made of copper, aluminum or the like having a narrower width than the flat plate conductive bar 22a is connected. Further, an insulating plate 23 is interposed between the flat conductive bar 22a and the flat conductive bar 22b. That is, in order to connect the positive and negative sides of the smoothing capacitors 3,... And the positive terminals of the switching elements 5u1, 5v1, and 5w1 for each phase, the flat conductive bars 22a and the flat plates A parallel plate conductive bar having an insulating plate 23 sandwiched between the conductive bar 22b is used.

  Specifically, the parallel plate conductive bar is formed as shown in FIG. That is, the wide flat conductive bar 22a located in the lower layer constituting the parallel flat conductive bar is punched in advance at a plurality of places necessary in the manufacturing stage to form the opening 22aa, and the insulating laminated on the flat conductive bar 22a. Also in the plate 23, an opening is formed in a corresponding portion that matches the opening 22aa. Further, when the insulating plate 23 is sandwiched and integrated with the narrow flat conductive bar 22b located in the upper layer and the wide flat conductive bar 22a located in the lower layer, a flat plate located in the upper layer is used by using a drawing jig or the like. By applying a pressing force to the portion of the conductive bar 22b corresponding to the opening 22aa of the flat plate conductive bar 22a, the negative terminal of the smoothing capacitors 3,... And the negative terminal of the switching elements 5u2, 5v2, 5w2 of each phase Projections 22u1, 22v1, 22w1, 22u2, 22v2, and 22w2 are formed at locations corresponding to (see FIG. 2B). These protrusions 22u1, 22v1, 22w1 are connected to the positive side terminals of the respective phase switching elements 5u1, 5v1, 5w1, and the protrusions 22u2, 22v2, 22w2 are connected to the positive side of the smoothing capacitors 3,. In addition, the number of protrusions increases or decreases according to the number of smoothing capacitors 3.

  Whether each phase switching element 5u1 and 5u2, 5v1 and 5v2, 5w1 and 5w2 is connected in a three-phase configuration in which a flat conductive bar is stacked on an upper plate conductive bar 22b via an insulating plate. Alternatively, the flat plate conductive bar may be laminated on the upper portion of the flat plate conductive bar 22a and adjacent to the flat plate conductive bar 22b via an insulating plate.

  Further, two intake fans 24a (not shown) and 24b are arranged on the opposite side of the cooling fin 11 from the smoothing capacitors 3,... Has been. The two intake fans 24a, 24b generate a wind direction 21 indicated by an arrow that draws and exhausts air from the smoothing capacitors 3,..., And the smoothing capacitors 3,... And the switching elements 5u1, 5v1, 5w1, each phase. It plays the role of cooling 5u2, 5v2, 5w2.

  Therefore, according to the embodiment as described above, the opening 22aa at a predetermined position of the flat plate conductive bar 22a located in the lower layer of the two flat plate conductive bars 22a and 22b is formed, and the insulating plate 23 is sandwiched. Then, the projecting portions 22u1, 22v1, 22w1, 22u2, 22v2, and 22w2 are formed at locations corresponding to the opening portions 22aa of the flat plate conductive bar 22a of the flat plate conductive bar 22b that is located in the upper layer when integrated. ,... Are connected to the positive and negative terminals of the switching elements 5u1, 5v1, 5w1, 5u2, 5v2, and 5w2 such as IGBTs, so that each of the conductive bars 17b positioned in the upper layer shown in FIG. There is no need to weld the intermediate contact body 20 to the corresponding place, and the insulating plate 23 is sandwiched and integrated by two flat conductive bars 22a and 22b. A parallel-plate conductive bar can be produced good workability, it can be economically low cost.

  It should be noted that the side surface of the opening 22aa of the flat plate conductive bar 22a located in the lower layer and the protruding portion of the flat plate conductive bar 22b positioned in the upper layer, for example, the side surface portion of 22u1, need to be separated by an amount equivalent to the insulation distance. In actuality, a voltage difference of about 1000 V is generated, so it is necessary to form a distance that can withstand a withstand voltage of 2500 V to 4000 V. Therefore, in practice, as shown in FIG. 2C, the end edge of the opening 23a of the insulating plate 23 is bent into an L-shape 23b, and the distance between the side surface of the opening 22aa and the protruding portion, for example, the side surface of 22u1. While the L-shaped end 23b, which is the end of the opening 23a of the insulating plate 23, is positioned approximately at the middle of the gap between the side surface of the opening 22aa and the protruding portion, for example, the side surface 22u1. Deploy.

  Further, since the smoothing capacitors 3,... Are arranged in the vicinity of one side surface of the cooling fin 11 in a direction orthogonal to the arrangement direction of the switching elements 5u1-5u2, 5v1-5v2, 5w1-5w2 for each phase. ,... And the switching elements 5u1, 5v1, 5w1 for each phase and the switching elements 5u2, 5v2, 5w2 for each phase are substantially equal to each other, so that the W phase close to the smoothing capacitor 3,. Can solve the problem that the switching elements 5w1 and 5w2 are most susceptible to the heat of the smoothing capacitors 3. As a result, even when the switching elements 5u1, 5v1, 5w1 for each phase and the switching elements 5u2, 5v2, 5w2 for each phase are sequentially turned on / off, the switching elements 5u1, 5v1, 5w1 for each phase and each phase Heat can be evenly dissipated from the switching elements 5u2, 5v2, and 5w2. Therefore, there is no variation in the temperature of each switching element, temperature management can be performed thoroughly, and the temperature of the entire switching element can be lowered. As a result, it is possible to drive and control the elevator motor 4 having a large capacity while reducing the capacity of the inverter 5.

  Further, the positive and negative sides of the smoothing capacitors 3,... And the positive side terminals of the phase switching elements 5u1, 5v1, 5w1 and the negative side terminals of the phase switching elements 5u2, 5v2, 5w2 are connected by parallel plate conductive bars 22a, 22b. Therefore, the connection line has a larger area than the conventional bus bars 13a and 13b, and the surge voltage generated when the switching elements 5u1, 5v1, 5w1, 5u2, 5v2, and 5w2 are turned off can be greatly reduced. As a result, for example, when focusing only on the U-phase switching elements 5u1 and 5u2, each of the surge voltage erasing capacitors 25 is connected across the U-phase switching elements 5u1-5u2 as shown in FIG. It becomes possible to eliminate the surge voltage generated when the switching elements 5u1, 5v1, 5w1, 5u2, 5v2, and 5w2 are turned off. The surge voltage erasing capacitor 25 charges, for example, a surge voltage generated when the U-phase switching elements 5u1 and 5u2 are turned on. When the switching element 5u1 or 5u2 is turned off, the surge voltage erasing capacitor 25 is disconnected from the positive / negative line of the smoothing capacitor 3 when the switching element 5u1 or 5u2 is turned off. Since the voltage is higher than the voltage between the positive and negative lines of the smoothing capacitor 3, the voltage drops to a voltage regulated by the voltage between the positive and negative lines, and the surge voltage is erased by repeating charging and discharging according to the operation of the switching element 5u1 or 5u2. is there. Therefore, since the snubber circuit can be configured by only the capacitor 25 for each phase, the snubber circuit can be greatly simplified, and can greatly contribute to the miniaturization of the entire inverter 5.

  Further, since the intake fans 24a, 24b are arranged on the opposite side of the cooling fin 11 from the smoothing capacitors 3,..., The heat generation temperature generated from the smoothing capacitors 3,... And the switching elements 5u1, 5v1, 5w1, 5u2, 5v2 , 5w2 is uniformly taken in and exhausted, so that the inverter 5 can efficiently dissipate heat, and in particular, the temperature rise of each switching element 5u1, 5v1, 5w1, 5u2, 5v2, 5w2 can be efficiently suppressed.

  In addition, this invention is not limited to the said embodiment, In the range which does not deviate from the summary, various deformation | transformation can be implemented. For example, the switching elements 5u1, 5v1, 5w1, 5u2, 5v2, and 5w2 have been described as being independent of each other. However, the switching elements (5u1, 5u2), (5v1, 5v2), and (5w1, 5w2) of each phase are modules. Needless to say, the present invention can be similarly applied even if it has a structured configuration.

  Moreover, each embodiment can be implemented in combination, and in that case, the effect of the combination can be obtained.

The block diagram which shows one Embodiment of the power converter device which concerns on this invention. Sectional drawing of the parallel plate conductive bar which pinched | interposed the insulating member with the two flat plate conductive bars shown in FIG. 1, and the top view of the upper layer flat plate conductive bar. The block diagram of the snubber circuit of the power converter device which concerns on this invention. The block diagram of the conventional common power converter device. The block diagram of the snubber circuit of the conventional power converter device. The arrangement | positioning block diagram of the inverter containing the conventional smoothing capacitor. The connection cross-section block diagram of the flat plate conductive bar and switching element in the past.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Three-phase alternating current power supply, 2 ... Converter, 3 ... Smoothing capacitor, 4 ... Electric motor, 5 ... Inverter, 5u1, 5v1, 5w1, 5u2, 5v2, 5w2 ... Switching element (a modularized switching element is included), 11 ... cooling fins, 22a, 22b ... flat conductive bars, 22aa ... openings, 22u1, 22v1, 22w1, 22u2, 22v2, 22w2 ... projections, 23 ... insulating plates, 23a ... openings, 23b ... L-shaped, 24b ... Intake fan, 25 ... Surge voltage elimination capacitor.

Claims (4)

In the power conversion device in which an inverter in which a plurality of switching elements are connected in series for each phase is connected between the positive electrode side and the negative electrode side of the smoothing capacitor,
Switching element arraying means in which a plurality of switching elements of each phase are arrayed from one end side to the other end side in a predetermined order on the cooling fin;
Smoothing capacitor arraying means disposed in the vicinity of the cooling fin end portion, which is in a direction perpendicular to the array direction of the plurality of switching elements of each phase, at a substantially equidistant position with the plurality of switching elements of each phase;
The flat plate conductive bar is composed of two flat plate conductive bars sandwiching an insulating plate, and an opening is formed at a predetermined position of the flat plate conductive bar located in the lower layer, and the lower plate conductive bar is formed at a position corresponding to the opening of the flat plate conductive bar located in the upper layer. And a negative electrode side of the smoothing capacitor and a negative side terminal of the switching element of each phase are one flat plate which is the protruding portion of the upper flat plate conductive bar or the lower flat plate conductive bar. Connect with a conductive bar, and connect the positive side of the smoothing capacitor and the positive terminal of the switching element of each phase with the lower flat plate conductive bar or the other flat plate conductive bar that is a protrusion of the upper flat plate conductive bar. And a parallel plate conductive bar connecting means. The power conversion device according to claim 1,
As the parallel plate conductive bar connecting means, a flat plate conductive bar positioned in a lower layer is formed wide, and the smoothing capacitor and the positive or negative terminal of the switching element of each phase arranged on the far side from the smoothing capacitor; A flat conductive bar positioned in an upper layer is formed with a narrow width, and is connected to the negative or positive side terminal of the smoothing capacitor and the switching element of each phase arranged on the short distance side from the smoothing capacitor. A power converter. In the power converter device according to claim 1 or 2 ,
An electric power conversion device , wherein an intake fan that intakes radiated air is disposed on the opposite side of the smoothing capacitor across the cooling fin . In the power converter device according to claim 1 or 2 ,
A power converter comprising a snubber circuit including a surge voltage erasing capacitor provided so as to straddle a plurality of switching elements for each phase constituting the inverter .

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