JPH04161069A - power converter - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Objective of the Invention (Field of Industrial Application) The present invention particularly relates to a power conversion device in which semiconductor elements are air-cooled.

(Prior Art) In FIG. 12, which shows a main circuit single-line diagram of a conventional power conversion device, one side of an input bus 15 is connected to the secondary side of a rectifier transformer 20, and the other side of this input bus 15 is connected to the secondary side of a rectifier transformer 20. The sides are connected to the main circuit input terminals 6 of the plurality of power units 23, respectively.

On the other hand, each power unit 23 includes a semiconductor element 22 for inverse conversion connected to the DC side of the semiconductor element 21 for forward conversion via a reactor, a control board 5 connected on one side to this semiconductor element 22, etc. Of these, the input side of the semiconductor element 21 is connected to the main circuit input terminal 6, the output side of the semiconductor element 22 is connected to the main circuit output terminal 7, and the other side of the control board 5 is connected to the control circuit input/output terminal. 8 respectively.

Next, FIG. 13 is a partially cutaway front view showing a state in which the power units 23 of the power converter shown in the main circuit single-line diagram of FIG. 12 are stacked vertically in four stages, and FIG. A top view, and FIG. 15 is an enlarged sectional view taken along the line BB in FIG. 13.

In FIGS. 13 to 15, a control board 5 is stored vertically on the front side inside each of the power units 23 stacked in four stages, and a control board 5 is provided at the rear of the control board 5 for forward conversion and A semiconductor element unit consisting of a semiconductor element 2 for inverse conversion and a cooling fin 3 is arranged horizontally, and behind this, a cooling fan 4 is attached to the center front of a partition 23a provided in the power unit 23. On the left side of 4, a main circuit input terminal 6 and a main circuit output terminal 7 are attached above and below, respectively.

Moreover, a box body 24 in which these power units 23 are housed
A front door 24a is provided on the front of the front door 2.
A rectangular vent 9 is provided at the bottom of 4a, and a similarly rectangular air filter 10 for dust removal is attached to this vent 9.

On the other hand, a ceiling fan 11 is attached to the ceiling surface of the box body 24 to exhaust the air inside.

Now, in the power conversion device configured in this way,
The cooling air that is exhausted by the ceiling fan 11 and enters the bottom of the box 24 from the air filter IO as shown by the arrow 19A in FIG. 14 rises as shown by the arrow 19B in FIG. After entering the rear part of the partition 23a from the rear, the cooling fan 4 sprays the cooling fins 3 of each semiconductor element unit 23 as shown by the arrow +9c.

Then, this cooling air is divided to the left and right, and after being heated by each cooling fin 3 heated by the energization of each semiconductor element 2 and the ○N/OFF state, it is heated by the arrow 19D shown in Fig. 13.15.
As shown, the air flows out from the left and right centers of each power unit 23 into the left and right duct-shaped ventilation passages of the box body 24, rises, and is discharged above the box body 24 by the ceiling fan 11.

(Problem to be Solved by the Invention) However, in the power conversion device configured and cooled in this way, the power unit 23 in the upper stage is cooled by the air warmed by the power unit 23 below it, and as it goes to the upper stage, Since the cooling conditions are poor, the temperature rises, which not only limits the output of each semiconductor element, but also reduces the characteristics and life of the IC on the control board 5.

Therefore, the load must be reduced accordingly toward the upper units.

Therefore, if the side of each power unit 23 and the box body 2
4, the installation area of the box body 24 increases.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a power conversion device that is easy to maintain and inspect and can even out the temperature rise values of electrical components of upper and lower power units without increasing the installation area of the box. .

[Configuration of the Invention (Means and Effects for Solving the Problems) The present invention provides a power unit in which a semiconductor element is incorporated, which is housed in a box body in multiple stages above and below, and an exhaust fan is provided on the ceiling surface of the box body. In the power conversion device, an L-shaped intake duct is provided on one side of the power unit inside the box,
By providing an inverted-shaped exhaust duct on the other side of the power unit inside the box body, and providing an intake port that communicates with the intake duct on the outer wall of the box body outside the intake duct, the upper and lower power units are connected to the cooling air taken into the intake duct. This is a power conversion device that cools the air directly and discharges it all together into an exhaust duct, making maintenance and inspection easy without increasing the installation area of the box, and equalizing the temperature rise of the electrical components of the upper and lower power units.

(Example) Hereinafter, one example of the power conversion device of the present invention will be described with reference to the drawings. However, parts that overlap with those in FIGS. 12 to 15 are given the same reference numerals and explanations are omitted.

FIG. 1 is a partially broken pressure surface view of the power conversion device of the present invention, FIG. 2 is a right side view of FIG. 1, and FIG. 3 is an enlarged cross-sectional view taken along line AA of FIG. 1.

In FIGS. 1 to 3, a narrow air intake port 9 is provided on the right side of the front door 12a of the box body 12 from the lower end to the upper end, and an air filter 10 for dust removal is attached to this air intake port 9. has been done.

On the other hand, as shown in FIG. 3, the power unit 1 is provided with a wind tunnel 13B extending from left to right at the rear of the center and having an abbreviated shape in a plan view and a substantially square shape in a right side view. A cooling fan 4 is housed vertically.

Further, on both sides of the power unit 1, support plates (not shown) for pulling out the drawer equipped with slide rails (not shown) are provided on the box body 12, and the power unit 1 can be freely pulled out forward by this sliding mechanism.72. ing. Further, on the front end of the right side of the power unit 1, an input/output terminal 8 for a control circuit is attached to the upper part, and a main circuit output terminal 7 is attached to the lower part, and a main circuit input terminal 6 is attached to the right side of the rear side of the power unit 1.
A contact 6a is attached so as to protrude rearward.

Note that the power unit 1 is housed slightly to the left of the center of the box 12, and between the right side of the power unit 1 and the right side of the box 12, there is a cable room processing space that communicates with the bottom space of the box 12. A wind tunnel 13A is formed as an L-shaped intake duct that also serves as a maintenance/inspection room, and the left side of the power unit 1 and the left side of the box body 12 communicate with the lower part of the ceiling, forming an inverted-shaped exhaust duct. It is a narrow wind tunnel 14. Furthermore, the left end of the bottom of the bottom power unit 1 and the left side and front and rear surfaces of the box body 12 are separated by a partition +6A, and the space between the right end and front and rear ends of the ceiling of the top power unit 1 and the box body 12 is partitioned by a partition 16B. Furthermore, the left and right rear ends of the power unit and the rear end of the box body 12 are also partitioned, and as a result, the left and right wind tunnels 14.13A communicate with each other through the wind tunnel 13B of each power unit 1. Of these, wind tunnel +3
At A, a load side cable 7a rises from the floor surface on which the box 12 is installed and is connected to the output terminal 7, and an input bus is arranged vertically at the center rear of the box 12 to connect the main circuit. The contacts 6a of the input terminals 6 are aligned.

Now, in the power conversion device configured in this way,
The cooling air that enters the wind tunnel 13A from the intake port 9 on the right side of the door 12a due to the exhaust from the ceiling fan 11 is directed by the arrow 17.
As shown in A, a wind tunnel 1 is formed in each power unit 1 by a cooling fan 4 housed in each power unit 1.
Cooling fin 3 penetrates into 3B and is heated by semiconductor element 2
After being heated and discharged into the wind tunnel 14 as shown by an arrow 17B, they join together and rise, and are discharged to the outside of the box body 12 by the ceiling fan 11 via the upper side of the power unit 1 on the top stage.

As a result, in the power converter configured as described above, the upper units of the power units 1 stacked in multiple stages are also directly cooled by the outside air flowing into the right side of each power unit 1 from the door 12a, and each power unit ] The warm air discharged from the wind tunnel 13B on the left side is
4 and is discharged to the outside all at once, so the influence of the lower power unit can be minimized.
Semiconductor elements 2 and control board 5 of upper and lower power units 1
It is possible to equalize the temperature rise value of , extend the life of electrical parts, and achieve the desired performance.

In addition, an input/output terminal block 8 for the control circuit and an output terminal block 7 for the main circuit are provided in front of the right side of each power unit 1, and the wind tunnel 14
Since the connection to the input/output terminal block 6°7 can be made from the front without increasing the width of the box 12, the power converter can be easily assembled, maintained, and inspected without increasing the external size of the box 12.

Furthermore, the air warmed inside the wind tunnel 13B is transferred to the wind tunnel 14.
As a result, the rate of rise of warm air in the wind tunnel 14 is accelerated, the exhaust volume by the ceiling fan 11 is increased, the cooling effect is further increased, loss is reduced, and the power conversion device can maintain its characteristics.

Next, FIG. 4 is a front view showing another embodiment of the power conversion device of the present invention, and FIG. 5 is a right side view of FIG. Indicates when

In this case, if applied when the box body is not connected and installed adjacent to the right side, the cooling air can be guided straight to the wind tunnel in the left power unit, which has the advantage of further increasing the cooling effect of the power unit. be.

Further, FIG. 6 is a front view showing another embodiment of the power conversion device of the present invention, and FIG. 7 is a right side view of FIG. 6.

In FIGS. 6 and 7, the air intake port 9 and the air filter 10 are provided at the front right side of the box body 12, and the power unit 1 has a shape obtained by rotating the power unit 1 in FIG. 3 by 90° clockwise.

In this case, since the main circuit cable 7a and the input/output terminal block 6.7 of the control circuit are also on the front side, there is an advantage that maintenance and inspection are easier.

Furthermore, FIG. 8 shows still another embodiment of the power conversion device of the present invention, and FIG. 9 is a right side view thereof.

In FIGS. 8 and 9, the air intake port 29 and the air filter 30 are attached to the bottom of the box body 32 (note: cooling air enters from both sides and rear surface of the foundation base (not shown)), and the others are attached to the bottom of the box body 32. ~ Same as Figure 2.

This case is suitable when the air filter cannot be attached to the front door due to the meters/relays attached to the front door or because of aesthetic considerations, and when the boxes are connected adjacent to each other on the left and right sides.

FIG. 10 shows still another embodiment of the power conversion device of the present invention, in which the upper end of the wind tunnel 43 is extended to the ceiling,
A ventilation hole 39 and an air filter 40 are provided on the ceiling surface.

In addition, in FIGS. 1 to 3, the left and right sides are reversed, and the intake port 9 is
．． The air filter 10 and wind tunnel +3A may be placed on the left side, the wind tunnel 14 may be placed on the right side, and the direction of the wind tunnel 13B may be reversed.
Similarly, the left and right sides may be reversed in FIGS. 4 to 11 as well.

[Effects of the Invention] As described above, according to the present invention, in a power conversion device in which a power unit incorporating a semiconductor element is housed in a box body in multiple stages above and below, and an exhaust fan is provided on the ceiling surface of the box body, By providing an L-shaped intake duct on one side of the power unit, an inverted-shaped exhaust duct on the other side of the power unit inside the box, and an intake port that communicates with the intake duct on the outer wall of the box outside the intake duct, Since the upper and lower power units are directly cooled by the cooling air taken into the intake duct and discharged to the exhaust duct, maintenance and inspection are easy without increasing the installation area of the box. It is possible to obtain a power conversion device that can equalize the power.

[Brief explanation of drawings]

FIG. 1 is a partially broken pressure surface view showing one embodiment of the power conversion device of the present invention, FIG. 2 is a right side view of FIG. 1, and FIG.
FIG. 4 is a partially broken pressure surface view showing another embodiment of the power conversion device of the present invention, FIG. 5 is a right side view of FIG. 4, and FIG. FIG. 7 is a right side view of FIG. 6, and FIG. 8 is a partially cutaway front view showing another embodiment of the power converter of the present invention. 9 is a right side view of FIG. 8, FIG. 10 is a partial fracture pressure surface view showing still another embodiment of the power conversion device of the present invention, and FIG. 11 is a right side view of FIG. 10. Fig. 12 is a main circuit single-line diagram of this type of power conversion device, Fig. 13 is a partially cutaway front view showing an example of a conventional power conversion device, Fig. 14 is a right side view of Fig. 13, and Fig. 15 13 is an enlarged cross-sectional view taken along line B-B in FIG. 13. 1...Power unit 2...Semiconductor element 4...Cooling fan 9...Intake port 11...Ceiling fan 12...Box +3A, 13B, +4...Wind tunnel (11733) Agent Patent attorney Yoshiaki Inomata (and 1 other person) Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12

Claims (1)

[Claims] In a power conversion device in which a power unit incorporating semiconductor elements is housed in a box body in multiple stages above and below, and an exhaust fan is provided on the ceiling surface of the box body, an L-shaped intake duct is provided on one side of the power unit in the box body. An inverted L-shaped exhaust duct is provided on the other side of the power unit in the box body, and an intake port communicating with the intake duct is provided on the outer wall of the box body outside the intake duct. Device.