JP4311317B2 - Power converter - Google Patents

Description

  The present invention relates to power conversion devices such as boost converters and inverters, and more particularly to prevention of device vibration caused by the arrangement of components thereof.

  A boost converter, which is a type of power conversion device, includes a switching element, a reactor, a capacitor, and the like connected by a bus bar, and these are housed in a case. When the reactor or the like is operated, vibrations are generated in the core and the coil, and this vibration is transmitted to the case, which causes annoying noise.

In order to prevent the reactor from vibrating, a conventional reactor (see Patent Document 1) inserts a spacer into the hollow portion at the center of the annular core to prevent vibration of a pair of winding portions facing each other. Moreover, in order to prevent the noise of a reactor, the conventional soundproofing apparatus (refer patent document 2) has covered the reactor with the soundproof box and the sound-absorbing board.
JP-A-8-222458 JP 2002-73034 A

  The vibration and noise of the reactor itself may be suppressed by the countermeasures of the conventional example. However, in many cases, components such as capacitors, bus bars, and the like that generate vibrations are housed in the case in addition to the reactor, such as a boost converter. In this case, even if the vibration of the reactor is suppressed, if the vibration of the capacitor, the bus bar, etc. is not prevented, the case vibrates and generates noise. At this time, even if the vibrations of the reactor, the capacitor, and the bus bar are relatively small, if the directions are aligned, the resonance of the case increases.

  The present invention has been made in view of the above circumstances, and there is provided a power conversion device capable of suppressing vibration of a case even when two or more components that generate vibration such as a reactor and a capacitor are accommodated in the case. The purpose is to provide.

  The inventor of the present application has come up with the idea of arranging a plurality of component parts in a case so that their respective vibration directions are not aligned (not in the same direction), thereby completing the present invention.

(1) The power conversion device according to the first invention of the present application is, as described in claim 1, a case,
A reactor housed in the reactor case and fixed to the case and vibrating during operation; a capacitor housed in the capacitor case and fixed to the case and vibrating during operation; a first bus bar that connects the reactor and the capacitor and vibrates during operation; 2 bus bars and a bus bar arranged in a vertical direction . In this power conversion device, the side wall of the reactor case whose rigidity is lower than the rigidity of the end wall and the side wall of the capacitor case whose rigidity is lower than the rigidity of the end wall are arranged to be orthogonal to each other, and the first bus bar and the second bus bar The direction in which the vibrations approach and separate from each other is orthogonal to the vibration direction of the reactor and the vibration direction of the capacitor . As a result, the vibration direction of the case is a combination of these three vibration directions.

(2) A power converter according to a second aspect of the present invention includes a case, a reactor fixed to the case, a capacitor fixed to the case, and a bus bar connecting the reactor and the capacitor. Become. In this power converter, a reactor, of the capacitors and the bus bar, the side walls of the two vibration directions Ri is Do different rigidity lower reactor casing than the rigidity of the end walls side walls and a lower capacitor case rigidity than the rigidity of the end walls to vibrate And are orthogonal. As a result, the vibration direction of the case is a combination of these two vibration directions.

  (1) According to the power converter of the first invention, the case can include three vibration sources such as a reactor, a capacitor, and a bus bar, and resonance due to each vibration can be prevented. Can be kept small.

Further , since the vibration directions of the reactor, the capacitor, and the bus bar are perpendicular to each other, the vibration of the case can be further reduced. Furthermore , the reactor, the capacitor, and the bus bar can be arranged in the case with good space efficiency while suppressing the overall vibration.

  (2) According to the power converter according to the second aspect of the invention, two of the reactor, the capacitor and the bus bar arranged in the case are vibration sources, but resonance due to these vibrations can be prevented, and the case and thus the power The vibration of the whole conversion device can be kept small.

According to the power conversion device of the second aspect , since the vibration direction of the reactor and the vibration direction of the capacitor form a right angle, the vibration of the case can be further reduced. According to the power conversion device of the third aspect , the vibration direction of the reactor or the capacitor and the vibration direction of the bus bar form a right angle, so that the vibration of the case can be further reduced.

(A) Overall The power converter includes a boost converter, an inverter, a DC-DC converter, and the like. All include components that generate vibration due to electromagnetic action during operation, such as a reactor fixed to the case, a capacitor fixed to the case, and a bus bar connecting the reactor and the capacitor. Depending on which component generates vibration, it can be classified into two types.

(B) First type The first type of power converter is based on the premise that the reactor, the capacitor, and the bus bar all vibrate. In this power converter, the vibration direction of the reactor, the vibration direction of the capacitor, and the vibration direction of the bus bar are made different from each other, thereby preventing the occurrence of resonance. For example, the vibration directions of the reactor, the capacitor, and the bus bar can be perpendicular to each other. However, the angle formed by these is not limited to a right angle, but may be an obtuse angle larger than the right angle or an acute angle smaller than the right angle.

  In order to make the vibration directions different from each other, for example, the reactor and the capacitor are juxtaposed so that the respective vibration directions are orthogonal to each other, and the bus bar is straddled (stranded) in the vicinity, and the vibration direction is orthogonal to the vibration direction of the reactor and the capacitor. It may be arranged so as to.

(C) Second type A power converter of the second type is based on the premise that two of the reactor, the capacitor, and the bus bar vibrate. A reactor, a capacitor, or a bus bar does not always vibrate, and may not vibrate depending on its configuration. There are three modes: when the reactor and the capacitor vibrate, when the capacitor and the bus bar vibrate, and when the bus bar and the reactor vibrate.

  In this power converter, two vibrating directions of the reactor, the capacitor, and the bus bar are made different from each other, thereby preventing the occurrence of resonance. For example, the vibration direction of the reactor and the vibration direction of the capacitor are perpendicular to each other. In addition, the vibration direction of the reactor or the capacitor and the vibration direction of the bus bar are perpendicular to each other. In order to make the two vibration directions different from each other, for example, the reactor and the capacitor may be juxtaposed so that the respective vibration directions are orthogonal to each other.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

(Constitution)
The boost converter shown in FIGS. 1 and 2 includes a reactor 20, a capacitor 30, and a bus bar unit 40, which are accommodated in the case 10. In addition, although a board | substrate and a switching element are included, since it is not related to this invention, illustration is abbreviate | omitted. As shown in FIG. 2, the box-shaped converter case 10 includes a bottom wall 11, a pair of long side walls 13, a pair of short end walls 12 and a top wall 14.

  As shown in FIG. 3, the reactor 20 includes a case 21, a track race-shaped core 23 accommodated in the case 21, and a coil 25 wound around the core 23. Among these, the case 21 has a box shape and includes a side wall 22a and an end wall 22b. A pair of end portions 26 of the coil 25 wound around the pair of winding portions 24 of the core 23 are drawn out from the end wall 22 b of the case 21. The rigidity of the long side wall 22a is smaller than that of the short end wall 22b, and when the reactor 20 is energized, the pair of winding portions 24 of the core 23, that is, the direction in which the side wall 22a approaches and separates (up and down direction in FIG. Vibrates in the Y direction).

As shown in FIG. 4, the capacitor 30 includes a case 31 and a spiral electrode plate 33 accommodated therein. Of these, the case 31 has a box shape and includes a side wall 32a and an end wall 32b. A pair of end portions 34 of the electrode plate 33 are drawn out from the end wall 32b. The rigidity of the long side wall 32a is smaller than that of the short end wall 32b, and the linear portion 33a of the electrode plate 33, that is, the side wall 32a approaches and separates when charging or discharging the horizontally long spiral electrode plate 33 (FIG. 4). (A) It vibrates in the middle up / down direction and the X direction).

  As shown in FIG. 5, the bus bar unit 40 includes a case 48 in which two bus bars 41 and 44 are arranged so as to overlap each other in the vertical direction. The upper bus bar 41 has a first part 42a close to the reactor 20, a second part 42b close to the capacitor 30, a third part 42c connecting the first part 42a and the second part 42b, and a fourth part forming a lead-out part. 42d is included. The connecting portions 43a and 43b formed in the first portion 42a and the second portion 42b are connected to the drawing end portion 26 of the reactor 20 and the drawing end portion 34 of the capacitor 30, respectively.

  Similar to the first bus bar 41, the second bus bar 44 has a first part 45a, a second part 45b, a third part 45c, and a fourth part 45d. The first part 45a and the second part 45b are connected to the connection parts 46a and 46b, respectively. Is formed. However, the positions of the connection portions 46a and 46b are slightly shifted from the positions of the connection portions 43a and 43b of the first bus bar 41. The first bus bar 41 and the second bus bar 44 are covered with a case 48. When the bus bar unit 40 is energized, it vibrates in the direction in which both bus bars 41 and 44 approach and separate (up and down direction in FIG. 5, Z direction). Depending on the configuration of the electric circuit, the bus bar may be connected to a substrate or a switching element (not shown).

  In summary, the rectangular parallelepiped reactor 20 and the rectangular parallelepiped capacitor 30 are arranged so that the vibration directions thereof are perpendicular to each other, and the vibration directions of the reactor 20 and the capacitor 30 are perpendicular to each other. . In addition, one bus bar 41 connected to one drawing end portion 26 of the reactor 20 and one drawing end portion 34 of the capacitor 30 and the other bus bar 44 connected to the other drawing end portions 26 and 34 are overlapped, and The reactor 20 and the capacitor 30 were arranged on both sides.

(Function)
The operation of the step-up converter itself is well known and is not directly related to the present invention, so the explanation is omitted. When electric power is supplied from the outside of the boost converter and the reactor 20 and the capacitor 30 are energized through the bus bar unit 40, the reactor 20 is connected between the winding portions 24 of the core 23 in the case 10 as shown in FIG. The capacitor 30 vibrates in the Y direction due to the magnetic action, and as shown in FIG. 6B, the capacitor 30 vibrates in the X direction due to the mutual magnetic action between the opposing portions of the electrode plate 33a. The vibrations of the reactor 20 and the capacitor 30 are transmitted to the case 10.

  The bus bar unit 40 vibrates in the Z direction by magnetic interaction between the one bus bar 41 and the other bus bar 44, and this vibration is transmitted to the case 10 via the reactor 20 and the capacitor 30. As a result, in the case 10, vibrations in the X direction of the capacitor 30, the Y direction of the reactor 20, and the Z direction of the bus bar unit 40 are combined.

(effect)
According to the boost converter of this embodiment, the vibration and noise applied to the case 10 can be suppressed while the case 10 includes the three vibration generation sources, the reactor 20, the capacitor 30, and the bus bar unit 40. This is because the vibration directions of the reactor 20, the capacitor 30, and the bus bar unit 40 are perpendicular to each other. Here, the vibrations of the reactor 20, the capacitor 30, and the bus bar unit 40 do not completely cancel each other. However, since the vibration directions are orthogonal to each other, the vibration generated in the case 10 is much smaller than when any two or three are in the same direction or when the angle formed is small.

  As can be seen from FIGS. 1 and 2, the reactor 20, the capacitor 30, and the bus bar unit 40 are disposed in the case 10 with good space efficiency, and the entire boost converter is compact.

It is a top view which shows the Example of this invention. It is a perspective view similarly. (A) is a top view of the reactor of the said Example, (b) is front sectional drawing similarly. (A) is a top view of the capacitor | condenser of the said Example, (b) is front sectional drawing similarly. It is a perspective view of the bus-bar unit of an Example. (A) is explanatory drawing which shows the vibration direction of a reactor, (b) is explanatory drawing which shows the vibration direction of a capacitor | condenser, (c) is explanatory drawing which shows the vibration direction of a bus-bar unit.

Explanation of symbols

10: Case 20: Reactor 21: Case 23: Core 25: Coil 30: Capacitor 31: Case 33: Electrode plate 40: Bus bar unit 41, 44: Bus bar

Claims (3)

A case (10), a reactor case (21) housed in the reactor case (21), fixed to the case and vibrating during operation, and a capacitor (31) housed in the capacitor case (31), fixed to the case and vibrated during operation ( 30), and a bus bar (40) in which a first bus bar (41) and a second bus bar (44) which connect the reactor and the capacitor and vibrate when operating are arranged in a vertical direction,
The side wall of the reactor case whose rigidity is lower than the rigidity of the end wall and the side wall of the capacitor case whose rigidity is lower than the rigidity of the end wall are arranged orthogonally, and the first bus bar and the second bus bar are close to each other The power converter according to claim 1, wherein the vibration direction of the reactor is orthogonal to the vibration direction of the reactor and the vibration direction of the capacitor. A case (10), a reactor case (21) housed in the reactor case (21), fixed to the case and vibrating during operation, and a capacitor (31) housed in the capacitor case (31), fixed to the case and vibrated during operation ( 30), and a bus bar (40) in which a first bus bar (41) and a second bus bar (44) which connect the reactor and the capacitor and vibrate when operating are arranged in a vertical direction,
The reactor, of the capacitor and the bus bar, Ri two vibration directions Do different vibrate, and the side wall of lower the reactor casing rigidity than the rigidity of the end walls, and the side wall of the lower stiffness the capacitor case than the rigidity of the end wall Are arranged so as to be orthogonal to each other .   The power converter according to claim 2, wherein a vibration direction of the reactor or the capacitor is orthogonal to a vibration direction of the bus bar.

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