JP5125560B2 - Power converter - Google Patents

Description

  The present invention relates to a power conversion device that is used as an uninterruptible power supply device in which a semiconductor element constituting a power converter and its attached electronic components, a secondary battery, and the like are housed in one cabinet.

  As this type of power conversion device, devices as shown in Patent Documents 1 and 2 are known.

  The structure of such a conventional power converter is shown in FIGS.

  FIG. 10 is a perspective view showing an external appearance of the power conversion device. 6 and 7 show the internal configuration of the power converter by removing the top plate 1a and the side plate 1b of the cabinet 1 formed of a rectangular box formed of the steel plate or the like shown in FIG. It is the top view and side view in the state which carried out. FIG. 8 is a plan view showing a configuration of a mounting plate for mounting the printed circuit board in the cabinet 1, and FIG. 9 is a longitudinal sectional view showing an enlarged mounting portion Q of the printed circuit board and the mounting plate in FIG.

  The cabinet 1 of the conventional power converter shown in the figure includes a power switch 11 and an operation indicator 12 on the front surface, an internal space is divided up and down by a partition plate 13, and a battery chamber 14 that houses the secondary battery 6 is located at the bottom. A power conversion chamber 15 is formed and accommodates the power converter 2 formed by the power converter printed circuit board 21 and the filter circuit printed circuit board 22 and the like. On the power conversion unit printed circuit board 21, a semiconductor power conversion element (not shown) attached to a cooling body 23 constituting the power conversion unit, an electrolytic capacitor 24, and many other electronic components 25 are mounted, and a direct current is also provided. A control relay 26 having a mechanical contact for controlling the circuit is mounted. On the filter circuit printed board 22, a reactor 27 and the like constituting the filter circuit are mounted.

  In addition, a cooling fan 3 and an input / output terminal board 4 are provided in the cabinet 1 for cooling the power conversion elements of the power conversion unit.

In order to fix the printed circuit boards 21 and 22 in the cabinet 1, a frame-shaped mounting plate 16 is fixed to the partition plate 13 fixed to the cabinet 1 by welding or the like as shown in FIG. . Then, mounting pieces 16a having screw holes are provided at a plurality of locations on the mounting plate 16, and the printed circuit board 21 is provided on these mounting pieces 16a through an insulating cushioning material 17 as shown in FIG. Alternatively, 22 is fastened and fixed by the mounting screw 18. At this time, the attachment piece 16 a is bent upward so that the tip of the attachment screw 18 does not penetrate the partition plate 11 and protrude into the battery chamber 14.
JP 2000-184752 A JP 2002-112557 A

  As described above, in the conventional power conversion device, the printed circuit board is fixed to the mounting plate 16 with the screws via the cushioning material 17 so as to be fixedly supported. Even in such a case, a certain amount of impact can be absorbed, and various electronic components mounted on the printed circuit board can be prevented from being damaged or malfunctioning.

  However, when a drop impact test is actually performed, if a buffer material is provided in this way, an electronic device such as a cooling body or an electrolytic capacitor having a particularly large mass like the power converter printed circuit board 21 due to a shock at the time of dropping. The printed circuit board 21 on which the component is mounted is greatly bent and deformed due to its mass and collides with the mounting plate 16 to receive a large impact. The contact of the relay 26 mounted on the printed board 21 is closed by the impact. It was confirmed that an accident occurred in which the indicator lamp in the operation indicator 12 was erroneously lit by welding due to the current supplied from the backup power source constituted by the secondary battery 6.

  In order to prevent such an accident, when shipping the power conversion device from the factory, in order to stop the backup power source constituted by the secondary battery 6, disconnect the output line and install it. It is conceivable to connect the output line of the secondary battery on site after completion, but in reality the handling of the secondary battery involves considerable danger, so this method should be used. I can't.

  In addition, the welding of the relay contacts as described above is because the relay 26 is mounted on the power conversion element printed board 21 on which the power conversion element cooling body 23 and the electrolytic capacitor 24 having a large mass are mounted. The cause is thought to be that the impact force increases when the printed circuit board 21 is deformed and collides with a fixed object when dropped. For this reason, it is conceivable that the cooling body 23 and the electrolytic capacitor 24 are removed from the printed circuit board 21 and directly fixed to the cabinet 1 or the like to reduce the impact force received by the printed circuit board on which the relay is mounted. However, since this type of power conversion device is configured in a small size by mounting many components at high density, there are many restrictions on the layout and it is difficult to take such a measure. .

  In order to solve such a problem, the present invention can reduce the impact received by the printed circuit board particularly when the power conversion device including the printed circuit board on which the electronic component having a large mass is mounted falls. It is an object of the present invention to provide a printed circuit board support device in a power conversion device.

  In order to solve the above-described problems, the present invention provides a power conversion device that accommodates a printed circuit board in which various electronic components constituting a power conversion unit such as a semiconductor element and an electrolytic capacitor attached to a cooling body are mounted in a cabinet. A mounting plate fixedly supported directly or indirectly by the cabinet, and fixedly supporting the printed circuit board on the mounting plate, and a plurality of supports formed by projecting in a truncated cone shape at the important points of the mounting plate Seats are provided, and insulating seats that are in contact with the printed circuit board or have a slight gap are coupled on these support seats.

  In this invention, it is preferable that the support seat is provided so as to face a region where an electronic component having a large mass such as an electrolytic capacitor and a cooling body of the printed board is mounted.

  As in the present invention, the mounting plate that supports the printed circuit board on which various electronic components constituting the power converter are mounted is provided with a support seat protruding in a truncated cone shape, and the printed circuit board is contacted on the support seat. Alternatively, an insulating seat having a slight gap is coupled, and the printed circuit board deformed by impact is received by the support seat through the insulating seat, so that the printed circuit board deformed by bending due to the fall of the device or the like becomes the supporting seat. The impact force at the time of collision is absorbed by the frustoconical support seat, the transmission of the impact force to the printed circuit board is reduced, and in particular, malfunction or damage of elements with mechanically moving parts such as relays is suppressed Can improve the reliability.

  Embodiments of the present invention will be described with reference to the embodiments shown in the drawings.

  1 to 4 show an embodiment of the present invention. 1 and 2 are a plan view and a side view showing the internal configuration of the power conversion apparatus with the top plate and side plates of the cabinet 1 removed. FIG. 3 is a plan view showing a configuration of a mounting plate for mounting the printed circuit board in the cabinet 1, and FIG. 4 is an enlarged vertical sectional view of the receiving portion P of the printed circuit board and the mounting plate in FIG.

  The embodiment of the present invention shown in FIGS. 1 to 4 has substantially the same configuration as that of the conventional apparatus shown in FIGS. 6 to 10, and therefore the same components are indicated by the same reference numerals.

  In the embodiment of the present invention shown in FIGS. 1 to 4, the cabinet 1 that houses the power converter 2 and the secondary battery 6 is divided into upper and lower parts by a partition plate 13 as in the conventional apparatus, and the lower battery The secondary battery 6 is accommodated in the chamber 14, and the power converter 2 is accommodated in the upper converter chamber 15.

  A cooling body 23 coupled with a semiconductor power conversion element (not shown), an electrolytic capacitor 24, other electronic components 25 and a relay 26 for controlling a DC circuit, which constitute a power conversion unit of the power converter 2, are mounted. The power converter printed circuit board 21 and the filter circuit printed circuit board 22 on which the reactor 27 constituting the filter circuit and the like are mounted are fixed to the mounting pieces 51 of the mounting plate 5 fixed on the partition plate 13 by the mounting screws 18.

  As shown in FIG. 3, the mounting plate 5 is provided with support seats 52 for supporting the printed circuit board 21 at a plurality of important points. As shown in FIG. 4, the support seat 52 protrudes from the mounting plate 5 to a truncated cone shape by a drawing process or the like, and is formed integrally therewith. The support seat 52 is provided at a position corresponding to a portion where an electronic component having a large mass such as the cooling body 23 or the electrolytic capacitor 24 of the printed circuit boards 21 and 22 is mounted.

  In this way, the insulating seat 53 formed of an insulating resin or the like is coupled to the truncated conical support seat 52 in order to insulate the printed circuit board from the support seat 52. The insulating seat 53 is coupled to the support seat 52 by fitting a coupling pin 53 a having a return piece 53 b for fixing at a tip extending downward thereof into a mounting hole 52 a provided in the support seat 52. The height of the insulating seat 53 is such that the upper end is in contact with the lower surface of the printed circuit board 21 or is separated with a slight gap.

  Whether the printed circuit board 21 on which various electronic components constituting the power conversion unit or the like are mounted and mounted in advance is provided with a cushioning material 17 on the mounting piece 51 of the mounting plate 5 fixed on the partition plate 13 in the cabinet 1. Alternatively, the mounting plate 18 is directly mounted, the mounting screw 18 is inserted from the mounting hole 21 a of the printed circuit board 21, and screwed into the screw hole 51 a of the mounting piece 51 to be fixed to the mounting plate 5.

  Since the mounting piece 51 of the mounting plate 5 to which the printed circuit board 21 is mounted is bent upward, a gap is formed between the printed circuit board 21 and the mounting plate 5. A part of the gap is filled with a frustoconical support seat 52 and an insulating seat 53 coupled to the support seat 52 and projecting from the mounting plate 5 projecting into the gap.

  For this reason, when the power converter falls, the printed circuit board 21 bends and curves as shown by the dotted line in FIG. 5A due to the impact force applied thereto, hits the insulating seat 53, and presses it in the direction of the arrow. To do. As a result, an impact force is transmitted from the insulating seat 53 to the support seat 52. The support seat 52 is elastically deformed on its peripheral wall, and is dispersed over the entire circumference of the peripheral wall as shown in FIG. Can absorb impact force.

  As a result, the impact force applied to the printed circuit board 21 is reduced until the amplitude becomes half or less, and a relay having a mechanical contact mounted on the printed circuit board 21 does not erroneously close the contact. The occurrence of welding accidents can be prevented. For this reason, according to this invention, it can ship in the state which connected the circuit of the buffer power source comprised with the secondary battery of the power converter device, can ensure the safety at the time of installation, and the reliability of a power converter device Can be improved.

It is a top view which shows the structure of the power converter device by the Example of this invention. It is a side view which shows the structure of the power converter device by the Example of this invention. It is a top view which shows the attachment plate used for this invention. It is a longitudinal cross-sectional view which expands and shows the attaching part P in FIG. It is operation | movement explanatory drawing of this invention, (a) is an enlarged side view of a printed circuit board and an attachment board, (b) is an enlarged plan view of the attachment board of a coupling | bond part. It is a top view which shows the structure of the conventional power converter device. It is a side view which shows the structure of the conventional power converter device. It is a top view which shows the mounting plate used for the conventional power converter device. It is a longitudinal cross-sectional view which expands and shows the attaching part P in FIG. It is a perspective view which shows the external appearance of the conventional power converter device.

Explanation of symbols

1: Cabinet 13: Partition plate 17: Buffer material 18: Mounting screw 2: Power converter 21, 22: Printed circuit board 23: Cooling body 24: Electrolytic capacitor 25: Electronic component 26: Relay with mechanical contact 27: Reactor 5 : Mounting plate 52: Support seat 52a: Mounting hole 6: Secondary battery

Claims (2)

  In a power conversion apparatus that accommodates a printed circuit board in which various electronic components constituting a power conversion unit such as a semiconductor element and an electrolytic capacitor attached to a cooling body are housed in a cabinet, the cabinet is directly or indirectly fixedly supported by the cabinet. The mounting board is provided, and the printed circuit board is fixedly supported on the mounting board, and a plurality of support seats formed in a truncated cone shape are provided at the important points of the mounting plate, and the print is provided on these support seats. A power conversion device comprising an insulating seat in contact with a substrate or having a slight gap.   2. The power conversion device according to claim 1, wherein the support seat is provided to face a region where an electronic component having a large mass such as an electrolytic capacitor and a cooling body of the printed board is mounted. .

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