JP6508281B2 - Filter device and power converter - Google Patents

Description

  The present invention relates to a filter device used in a power converter.

  There is a PWM (Pulse Width Modulation) converter that can suppress harmonics and improve a power factor as a power conversion device that converts an AC power supply into a DC power supply. When using a PWM converter, in order to prevent carrier ripple current generated by PWM switching from flowing out to the power supply system, a technology is known that electrically connects a T-type LC circuit between the PWM converter and an AC power supply. It is done.

  Here, the T-type LC circuit is composed of the first AC reactor on the AC power supply side and a plurality of reactors and capacitors including the second AC reactor on the PWM converter side, but for reducing customer wiring man-hours and installation space It has been proposed to store these in the same housing (see, for example, Patent Document 1).

International Publication 2015-033710

  In the LC circuit used for the power converter, a high frequency current including a carrier ripple current generated by PWM switching of the PWM converter flows to the second AC reactor on the PWM converter side in addition to the fundamental wave current from the AC power supply. Generally, the outer shape is larger than that of the first AC reactor on the AC power supply side. Here, in Patent Document 1, the second AC reactor having a large outer shape is disposed on the windward side, and the first AC reactor having a small outer shape is disposed on the windward side. Therefore, in the arrangement described in Patent Document 1, the second AC reactor inhibits the flow of the cooling air, making it difficult for the cooling air to hit the first AC reactor on the downwind side, which may cause performance deterioration due to insufficient cooling. There was a problem.

  The present invention has been made to solve the problems as described above, and it is an object of the present invention to improve the cooling performance of a filter device used in a power conversion device.

In the filter device according to the present invention, the first AC reactor connected to the AC power supply, the second AC reactor connected between the PWM converter and the first AC reactor, and the connection point between the first AC reactor and the second AC reactor The first AC reactor includes: a filter capacitor having one end connected thereto; a case having a cooling air intake portion and a cooling air discharge portion; and a first AC reactor, a second AC reactor, and a filter capacitor housed therein; is disposed on the windward side of the 2AC reactor, in a cross-sectional view as seen downwind side from the windward side, the outer shape is rather smaller than the first 2AC reactor, filter capacitor is disposed on the windward side of the 2AC reactor, downwind from the windward side in the cross-sectional view viewed side, characterized in that it is arranged so as to overlap the first 2AC reactor

  According to the present invention, it is possible to suppress the decrease in the heat radiation performance while suppressing the increase in the manufacturing cost.

FIG. 1 is a basic circuit diagram of a power conversion circuit using a filter device according to Embodiment 1 of the present invention. It is a schematic diagram which shows arrangement | positioning of LC circuit components of the filter apparatus concerning Embodiment 1 of this invention. It is a figure which shows AA sectional drawing in FIG. It is a schematic diagram for demonstrating the effect of the filter apparatus which concerns on Embodiment 1 of this invention. It is a circuit diagram which shows the modification of the filter apparatus which concerns on Embodiment 1 of this invention. It is a schematic diagram which shows arrangement | positioning of LC circuit components at the time of using the modification of the filter apparatus which concerns on Embodiment 1 of this invention. It is a schematic diagram which shows arrangement | positioning of LC circuit components of the filter apparatus concerning Embodiment 2 of this invention. It is a schematic diagram for demonstrating the effect of the filter apparatus which concerns on Embodiment 2 of this invention. It is a schematic diagram which shows arrangement | positioning of LC circuit components of the filter apparatus concerning Embodiment 3 of this invention.

  Hereinafter, a filter device and a power conversion device according to an embodiment of the present invention will be described in detail based on the drawings. Note that the present invention is not limited by the following embodiments.

Embodiment 1
FIG. 1 is a basic circuit diagram showing a power converter using the filter device according to the present embodiment. In the present embodiment, the filter device 10 is connected between the AC power supply 1 and the PWM converter 2. The connection relationship described in the present embodiment may be electrically connected within the range in which the effects of the present embodiment can be obtained.

  As shown in FIG. 1, the LC filter circuit constituting the filter device 10 includes a first AC reactor 3, a second AC reactor 4, a filter capacitor 5, and a damping resistor 6. The first AC reactor 3 is connected to the AC power supply 1, and the second AC reactor 4 is connected between the first AC reactor and the PWM converter 2. One end of the filter capacitor 5 is connected to a connection point 9 at which the first AC reactor 3 and the second AC reactor 4 are connected. In FIG. 1, the damping resistor 6 is connected between the connection point 9 and one end of the filter capacitor 5. One end of the filter capacitor 5 is connected to one of the three phases, and the other end is connected to the other end of the filter capacitor 5 connected to a different phase. That is, one end of each of the three filter capacitors 5 is connected to each of the connection points 9a, 9b and 9c of each phase, and the other end is connected to the common potential.

  Although the filter capacitor 5 of the LC filter circuit constituting the filter device 10 according to the present embodiment shown in FIG. 1 is in the case of Y connection (star connection), it is Δ connection (delta connection) or the like It is also good.

  After passing through the second AC reactor 4, the high frequency current generated by the switching of the PWM converter 2 flows to the side of the filter capacitor 5 whose impedance to the high frequency current is smaller than that of the first AC reactor 3. Thus, the LC filter circuit prevents high frequency current from flowing out to the AC power supply 1 side. The second AC reactor 4 also has a function of boosting the inter-PN voltage of the PWM converter.

  The damping resistor 6 is provided for noise reduction due to the resonance of the LC filter circuit, but may not be provided.

  The filter device 10 according to the present embodiment is configured by housing the above-described LC filter circuit component in one case.

  FIG. 2 is a schematic view showing the component arrangement of the LC filter device 10 according to the present embodiment. In the present embodiment, the three first AC reactors 3 and the three second AC reactors 4 connected to the respective phases of the three-phase AC power supply are respectively connected and shown as an outline of one rectangular parallelepiped. That is, the first AC reactor 3 in FIG. 2 is configured by connecting the three first AC reactors 3a, 3b and 3c in the circuit diagram of FIG. Similarly, the second AC reactor 4 is configured by connecting three second AC reactors 4a, 4b and 4c. The second AC reactor 4 disposed on the PWM converter 2 side has an outer shape larger than that of the first AC reactor 3 due to the function described above.

  Each of the AC reactors (3a, 3b, 3c, 4a, 4b, 4c) is formed of an iron core made of a magnetic material and a wound coil wound around the iron core.

  In FIG. 2, the first AC reactor 3, the second AC reactor 4, the capacitor 5, the cooling air intake unit 16, and the cooling air discharge unit 17 are provided in the housing 15 of the filter device 10. The LC filter circuit components disposed in the air flow are air cooled by the cooling air flowing from the cooling air intake 16 to the cooling air outlet 17. In FIG. 2, the direction in which the cooling air flows is indicated by an arrow 18. In the present embodiment, the cooling efficiency is enhanced by providing the fan 19 on the side of the cooling air discharge unit 17 in the housing 15 and using forced air cooling. Thus, the fans 19 installed in the housing 15 are combined and called a fan.

  In the present embodiment, the fan 19 is provided on the downwind side and forced air cooling is provided by sucking in air, but the fan 19 may be provided on the cooling air intake portion 16 side and forced air may be provided by blowing air. Needless to say. Also, the fan 19 may be provided outside the housing 15. Further, for example, in the case of being mounted on a vehicle travel device and performing air cooling using the flow of cooling air as the vehicle travels, the fan 19 may not be provided.

  Although FIG. 2 shows an example in which the first AC reactor 3, the second AC reactor 4, the filter capacitor 5, and the fan 19 are disposed in the housing 15, another component such as the damping resistor 6 is further accommodated. May be

  In the filter device 10 according to the present embodiment, the first AC reactor 3 is disposed on the windward side in the housing 15, and the second AC reactor is disposed on the windward side. By arranging the first AC reactor 3 having a small outer shape on the windward side and the second AC reactor 4 having a large outer shape on the windward side, both the first AC reactor 3 and the second AC reactor 4 can be efficiently cooled.

  FIG. 3 shows the inside of the housing 15 of the filter device 10 as viewed from the windward side in the AA cross section of FIG. That is, in FIG. 3, there is shown a region in which the air taken in from the cooling air intake port 16 directly contacts the first AC reactor 3, the second AC reactor 4, and the filter capacitor 5 without any obstacle. In FIG. 3, when the LC filter device 10 according to the present embodiment is used, it is possible to confirm a region where the cooling air directly hits the second AC reactor 4 without being blocked by the first AC reactor 3.

  The schematic diagram for demonstrating the effect of LC filter apparatus 10 which concerns on FIG. 4 at this Embodiment is shown. FIG. 4A shows the case where the present embodiment is used, and FIG. 4B corresponds to the case where the conventional second AC reactor 4 is disposed on the windward side of the first AC reactor 3. In FIG. 4, dotted arrows indicate how cooling air flows in the housing 15.

  The housing 15 of the filter device 10 is generally at ground potential. Therefore, each of the first AC reactor 3, the second AC reactor 4, and the filter capacitor 5 to which a voltage is applied when the PWM converter 2 is driven is provided to be separated from the casing 15 of the ground potential. The cooling air taken into the inside of the housing 15 flows through the gaps between the housing 15 and the respective parts to the cooling air discharge part 17 while cooling the heat-generating parts.

  In the case of the conventional example shown in FIG. 4 (b), the cooling air that has hit the second AC reactor 4 disposed on the windward side flows to the cooling air discharge unit 17 through the gap with the housing 15. A part of the cooling air leaks through a gap between the iron core and the winding of the second AC reactor 4 and the like, but most flows through the gap between the second AC reactor 4 and the housing 15. That is, since the cooling air flows around the outer peripheral portion of the second AC reactor 4, it does not easily hit the first AC reactor 3 and other LC circuit components disposed on the downwind side behind the second AC reactor 4 and can not be sufficiently cooled. . In particular, since the cooling air hardly passes through the vicinity of the central region of the housing 15 of the first AC reactor 3 which is behind the second AC reactor 4, the cooling can not be sufficiently performed.

  As described above, since the outer shape of the second AC reactor 4 is larger than that of the first AC reactor 3, when the second AC reactor 4 is disposed on the windward side, the second AC reactor 4 functions as a barrier, and the cooling air flows to the first AC reactor 3. There is a problem that the first AC reactor 3 can not be sufficiently cooled without being directly hit.

  As shown to Fig.4 (a), according to the filter apparatus 10 which concerns on this Embodiment, since the 1st AC reactor 3 with a small external shape was arrange | positioned upwinding rather than the 2nd AC reactor 4 with a large external shape, a 1st AC reactor Even if the cooling air wraps around the outer circumference of 3, the first AC reactor 3 has a small area that prevents the cooling air from hitting the second AC reactor 3, so cooling both the first AC reactor 3 and the second AC reactor 4 effectively Can.

  Furthermore, although the filter capacitor 5 is disposed on the windward side with respect to the second AC reactor 4 in the present embodiment, components smaller than the second AC reactor 4 have winds rather than being disposed on the windward side with respect to the second AC reactor 4. By disposing on the upper side, the part can be cooled efficiently. It is needless to say that when the necessity for cooling the component is low, the second AC reactor 4 may be disposed on the downwind side.

  FIG. 5 shows a modification of the power conversion circuit using the LC filter device 10 according to the present embodiment. As shown in FIG. 5, the third AC reactor 7 is provided between the connection point between the first AC reactor 3 and the second AC reactor 4 and the filter capacitor 5. By providing the third AC reactor 7, the filterable frequency range can be expanded.

  FIG. 6 is a side view showing the inside of the case 15 of the filter device 10 provided with the LC circuit shown in FIG. Since the third AC reactor 7 also has a smaller external shape than the second AC reactor 4, the first AC reactor 3, the second AC reactor 4, and the third AC reactor 7 are efficiently cooled by arranging the third AC reactor 7 on the windward side of the second AC reactor 4. be able to.

  As described above, according to the filter device 10 according to the present embodiment, among the AC reactors constituting the LC filter circuit, the first AC reactor 3 having the smaller outer shape is on the windward side, and the second AC reactor 4 having the larger outer shape is on the windside As a result, the cooling air can be applied efficiently to the LC circuit components, and the cooling performance can be improved.

  Further, in the LC filter circuit, a switching current component of high frequency flows in the second AC reactor 4 disposed on the PWM converter 2 side, so that the iron loss of the second AC reactor 4 becomes large. As a result, the amount of heat generation is larger in the second AC reactor 4 than in the first AC reactor 3, and the temperature is raised. Here, when the second AC reactor 4 is disposed on the windward side as in the prior art, there arises a problem that the cooling air that has been heat-exchanged with the second AC reactor 4 to be high temperature can not sufficiently cool the first AC reactor 3.

  According to the present embodiment, since the cooling air that has cooled the first AC reactor 3 cools the second AC reactor 4 having a higher temperature than the first AC reactor 3, both the first AC reactor 3 and the second AC reactor 4 can be efficiently It becomes possible to cool.

  In the present embodiment, the first AC reactor 3 and the second AC reactor 4 have been described by taking the structure in which three phase reactors are integrated as an example, but the reactors of each phase may not be integrated. . Even if the reactors of each phase are individually examined, the second AC reactor 4 has a larger external shape than the first AC reactor 3, so that the present embodiment can be applied, and similar effects can be obtained.

  Moreover, the direction of each AC reactor can cool the said AC reactor uniformly, if the direction of the iron core which becomes direction of the axial center of a winding coil is equal to the direction through which a cooling air flows. However, the direction of the cooling air and the direction of the iron core may be different in order to reduce the space in the housing 15 as much as possible and achieve miniaturization.

  Further, in the present embodiment where the second AC reactor 4 is disposed on the downwind side, the effect of the cooling air suction by the fan 19 can be obtained by disposing the fan 19 on the downwind side as shown in FIG. It leads to the improvement of cooling efficiency.

  In the present embodiment, the LC circuit components are arranged in one case, but not all of them may be arranged in one case. For example, the filter capacitor 5 is often covered with an insulating resin for the purpose of insulation, and the heat dissipation may be low. In such a case, other LC circuit components may be housed in a separate housing. That is, the filter device according to the present embodiment can be applied when at least the first AC reactor 3 and the second AC reactor 4 are housed in one housing, and the other LC circuit components are disposed separately from the housing. It may be done.

  As a switching element of the PWM converter 2 in the present embodiment, an element made of a wide band gap material such as SiC (silicon carbide), GaN (gallium nitride), diamond, GaO (gallium oxide) may be used. For example, in the case of using a switching element made of a wide band gap material such as SiC, particularly, the application at high frequency can be realized, the switching frequency generated by the PWM converter 2 becomes higher frequency, and the second AC reactor 4 becomes larger. That is, when the switching element made of the wide band gap material is used, there is a problem that the outer shape of the second AC reactor 4 becomes larger than that of the first AC reactor 3. Therefore, the effect of using the present embodiment can be remarkably obtained.

Second Embodiment
The filter device 10 according to the present embodiment is different from that of the first embodiment in that the second AC reactor 4 is disposed in a cooling air flow collecting region.

  FIG. 7 is a schematic view showing the inside of the case 15 of the filter device 10 according to the present embodiment. In the present embodiment, the fan 19 is disposed on the cooling air discharge unit 17 side. That is, the fan 19 is disposed on the downwind side, and the fan 19 sucks the cooling air to enhance the cooling efficiency. At this time, the cooling air that has flowed in from the cooling air intake unit 16 flows downwind while spreading into the housing 15. In particular, since a gap between the LC circuit component and the housing 15 is a region where the first reactor 3 and the filter capacitor 5 do not act as a barrier, the cooling air flows through the gap near the housing 15.

  When the cooling air flowing inside the housing 15 is taken into the fan 19, the cooling air is collected according to the shape of the fan 19 by the suction force of the fan 19. That is, the wind is collected such that the outer periphery of the cooling channel is reduced. As described above, in the wind collecting area where the outer periphery of the cooling flow path is reduced compared to the shape along the casing 15, the flow rate per unit area of the cooling air increases, so the second AC reactor disposed in the wind collecting area The total flow rate of the cooling air that hits 4 increases.

  Here, in the present embodiment, the air collecting area refers to an area in which the outer shape of the cooling flow passage is narrower on the leeward side than the outer shape of the housing 15. In consideration of the function of the fan used in a general filter device, the air collecting area of the fan 19 is represented by an area surrounded by a dashed dotted line in FIG. For example, the wind collecting area is expressed as expanding at an angle of 45 ° from the cooling air intake by the fan 19. That is, in the top view shown in FIG. 7, an area in which the cooling flow path is reduced so as to narrow at an angle of 45 ° from the housing 15 is taken as a wind collecting area. Here, the angle of the air collecting region may be approximately 45 degrees.

  Although the angle of the air collection area is 45 ° when the second AC reactor 4 and other parts are not arranged, cooling is performed when the second AC reactor 4 and other parts are arranged in the air collection area. Because the flow of wind is disturbed, the actual flow of cooling air does not become exactly 45 °. Therefore, in the present embodiment, the flow path of the cooling air at an angle of approximately 45 ° when the second AC reactor 4 and other components are not disposed, in consideration of the effect of the cooling improvement by the wind collection. Consider the area where can be narrowed as the wind gathering area.

  FIG. 8 shows a schematic view of the inside of the housing 15 for explaining the effect of the filter device 1 according to the present embodiment. In FIG. 8, the second AC reactor 4 a in the case where the present embodiment is not used is disposed outside the air collecting region.

  In FIG. 8A, how the cooling air flows in the housing 15 is indicated by a dotted arrow. In the wind collecting region, the direction of the cooling air is changed, and the outer shape of the flow path of the cooling air is reduced toward the downwind side. In the case of using the present embodiment, the cooling air collected in the air collecting region sufficiently strikes the second AC reactor 4, so that the cooling efficiency is improved. On the other hand, when the present embodiment is not used, of the cooling air passing through the gap between the second AC reactor 4a and the housing 15 without hitting the second AC reactor 4a, the cooling passing through the area away from the second AC reactor 4a Wind has a low heat exchange rate with the second AC reactor 4a, and can not sufficiently cool the second AC reactor 4a. That is, the cooling efficiency of the 2nd AC reactor 4a arrange | positioned out of a wind gathering area | region will become low.

  As shown in FIG. 7, the filter device 1 according to the present embodiment has the second AC reactor 4 arranged in the air collection region, so that the cooling efficiency of the second AC reactor 4 can be improved. In the present embodiment, the second AC reactor 4 only needs to be disposed in a part of the wind collection region, but at least half of the outer shape of the second AC reactor 4 is disposed in the wind collection region. Is desirable.

  Conventionally, as shown in FIG. 8 (b), when the second AC reactor 4a is disposed outside the air collection area, a wind shield 20 is provided to change the flow path so that the cooling air easily contacts the second AC reactor 4a. There has been known a method of improving the cooling efficiency of the second AC reactor 4a. If the wind shield plate 20 is added as in the past, the cooling efficiency is improved, but this leads to an increase in cost due to the addition of parts and an increase in the size of the filter device 10.

  According to the present embodiment, the cooling air can easily hit the second AC reactor 4 without providing additional components such as the wind shield plate 20. Therefore, the filter device 1 with high cooling efficiency can be obtained at low cost. That is, since the total flow rate of the cooling air corresponding to the second AC reactor 4 can be increased, the effect of sufficiently cooling the second AC reactor 4 having a large amount of heat generation can be obtained.

  Although the fan 19 is disposed inside the housing 15 in the present embodiment, it may be disposed outside the housing 15. Even when the fan 19 is disposed on the downwind side of the cooling air discharge unit 17, if the second AC reactor 4 is disposed in the air collecting region where the air collecting effect occurs in the housing 15, the effect of the present embodiment described above is obtained. can get.

  In the present embodiment, only portions different from the first embodiment have been described. The other parts are the same as in the first embodiment.

Third Embodiment
In the filter device 10 according to the present embodiment, the LC circuit component disposed on the windward side of the second AC reactor 4 suppresses the cooling air that is going to flow into the gap between the second AC reactor 4 and the housing 15. The arranged point is different from the first or second embodiment.

  FIG. 9 is a schematic view showing the arrangement of LC circuit components in the housing 15 of the filter device 10 according to the present embodiment. As shown in FIG. 9, it is suppressed that cooling air flows in the gap between the second AC reactor 4 arranged on the downwind side and the casing 15, and the first AC on the windward side is sufficiently applied to hit the second AC reactor 4. Reactor 3 or filter capacitor 5 is arranged.

  Specifically, when the windward side is viewed from the windward side, the first AC reactor 3 or the filter capacitor 5 is disposed so as to overlap the gap area between the second AC reactor 4 and the housing 15. The external shape of the first AC reactor 3 and the filter capacitor 5 is smaller than that of the second AC reactor 4, so it is difficult to completely close all the gaps. However, by closing a part of the gaps, the cooling air that hits the second AC reactor 4 can be increased, and the effect of improving the cooling efficiency of the second AC reactor 4 can be obtained.

  Although it is desirable that the first AC reactor 3 or the filter capacitor 5 is in contact with the housing 15, the effect of the present embodiment can be obtained even if the first AC reactor 3 or the filter capacitor 5 is not in contact. When in contact with the housing 15, a region not requiring insulation with the housing 15 may be used as a bonding surface or in contact via an insulating sheet or the like.

  According to the present embodiment, it is possible that the cooling air passes through the gap between the second AC reactor 4 and the housing 15 by the LC circuit component even if the additional component such as the wind shield plate 20 shown in FIG. 8B is not provided. The cooling efficiency of the second AC reactor 4 can be improved.

  In the present embodiment, the direction of the cooling air is induced toward the second AC reactor 4 by the first AC reactor 3 or the filter capacitor 5, but other LC circuit components may be used. For example, the damping resistance 6 shown in FIG. 1 or the third AC reactor 7 shown in FIG. 5 may be arranged to suppress the flow of cooling air in the gap between the second AC reactor 4 and the housing 15.

  Further, in the present embodiment, it goes without saying that the second AC reactor 4 may be disposed in the air collecting region as in the second embodiment. The second AC reactor 4 can be more reliably applied to the second AC reactor 4 by arranging the second AC reactor 4 in the air collection area and guiding the cooling air by the arrangement of the LC circuit components on the windward side to the second AC reactor 4. it can.

  In the present embodiment, only portions different from the first or second embodiment have been described. The other parts are the same as in Embodiment 1 or 2.

  The configuration shown in the above embodiment shows an example of the contents of the present invention, and can be combined with another known technique, and one of the configurations is possible within the scope of the present invention. Parts can be omitted or changed.

  DESCRIPTION OF SYMBOLS 1 AC power supply, 2 PWM inverter, 3 1st AC reactor, 4 2nd AC reactor, 5 filter capacitor, 6 damping resistance, 7 3rd AC reactor, 10 filter apparatus, 15 housings, 16 cooling air intake part, 17 cooling air discharge Part, 19 fins, 20 wind shields.

Claims (11)

A first AC reactor connected to an AC power supply;
A second AC reactor connected between the PWM converter and the first AC reactor;
A filter capacitor whose one end is connected to a connection point between the first AC reactor and the second AC reactor;
A case having a cooling air intake part and a cooling air discharge part, and containing the first AC reactor, the second AC reactor, and the filter capacitor ;
Equipped with
Wherein the 1AC reactor, the disposed on the windward side of the 2AC reactor, in a cross-sectional view as seen downwind side from the windward side, rather smaller than the outer shape is the first 2AC reactor,
The filter device is disposed on the windward side of the second AC reactor, and is disposed so as to overlap the second AC reactor in a cross-sectional view from the windward side to the windward side . A third AC reactor connected between the connection point and the filter capacitor;
  Equipped with
  The third AC reactor is disposed on the windward side of the second AC reactor in the housing, and is disposed so as to overlap the gap region between the second AC reactor and the housing in a cross-sectional view from the windward side to the windward side. is being done
  The filter device according to claim 1, characterized in that A first AC reactor connected to an AC power supply;
  A second AC reactor connected between the PWM converter and the first AC reactor;
  A filter capacitor whose one end is connected to a connection point between the first AC reactor and the second AC reactor;
  A third AC reactor connected between the connection point and the filter capacitor;
  And a case having a cooling air intake unit and a cooling air discharge unit, and containing the first AC reactor, the second AC reactor, and the third AC reactor.
  The first AC reactor is disposed on the windward side of the second AC reactor, and the outer shape is smaller than that of the second AC reactor in a cross-sectional view from the windward side to the windward side,
  The third AC reactor is disposed on the windward side of the second AC reactor in the housing, and is disposed so as to overlap the gap region between the second AC reactor and the housing in a cross-sectional view from the windward side to the windward side. is being done
  Filter device characterized by The filter capacitor is disposed on the windward side of the second AC reactor
  The filter device according to claim 3, characterized in that A fan disposed on the downwind side of the second AC reactor in the housing;
  The second AC reactor is disposed in a wind collecting area by the fan
  The filter device according to any one of claims 1 to 4, characterized by The first AC reactor is disposed so as to overlap a gap region between the second AC reactor and the housing in a cross-sectional view when the windward side is viewed from the windward side
  The filter device according to any one of claims 1 to 5, characterized in that The filter capacitor is disposed so as to overlap a gap region between the second AC reactor and the housing in a cross-sectional view when the windward side is viewed from the windward side
  The filter device according to any one of claims 1 to 6, characterized in that The direction of the axis of the second AC reactor matches the direction of the cooling air
  The filter device according to any one of claims 1 to 6, characterized in that PWM converter,
A first AC reactor connected to an AC power supply;
A second AC reactor connected between the PWM converter and the first AC reactor;
A filter capacitor whose one end is connected to a connection point between the first AC reactor and the second AC reactor;
And a case having a cooling air intake unit and a cooling air discharge unit, and containing the first AC reactor, the second AC reactor, and the filter capacitor .
Wherein the 1AC reactor, the disposed on the windward side of the 2AC reactor, in a cross-sectional view as seen downwind side from the windward side, rather smaller than the outer shape is the first 2AC reactor,
The power conversion device according to claim 1, wherein the filter capacitor is disposed on the windward side of the second AC reactor, and is disposed so as to overlap the second AC reactor in a cross-sectional view from the windward side to the windward side . PWM converter,
A first AC reactor connected to an AC power supply;
  A second AC reactor connected between the PWM converter and the first AC reactor;
  A filter capacitor whose one end is connected to a connection point between the first AC reactor and the second AC reactor;
  A third AC reactor connected between the connection point and the filter capacitor;
  And a case having a cooling air intake unit and a cooling air discharge unit, and containing the first AC reactor, the second AC reactor, and the third AC reactor.
  The first AC reactor is disposed on the windward side of the second AC reactor, and the outer shape is smaller than that of the second AC reactor in a cross-sectional view from the windward side to the windward side,
  The third AC reactor is disposed on the windward side of the second AC reactor in the housing, and is disposed so as to overlap the gap region between the second AC reactor and the housing in a cross-sectional view from the windward side is being done
  Power converter characterized by the above. The PWM converter comprises a switching element made of wide band gap material
  The power converter device according to claim 9 or 10 characterized by

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