JP6841734B2 - Electrical equipment - Google Patents

Description

The present invention relates to an electric device such as a power converter.

Patent Document 1 discloses a power conversion device for boosting DC power obtained from renewable energy such as solar power and then converting it into AC power. This power conversion device includes a capacitor, a reactor, a switching element, and the like that constitute a DC / DC converter circuit and an inverter circuit, and these are housed in a housing. Further, in the power conversion device, the heat generating parts in the housing are forcibly cooled by the blower fan.

Specifically, two ducts and two blower fans arranged at the inlets of the ducts are provided in the housing of the power conversion device. A reactor is arranged in one duct, and a heat sink for cooling the switching element is arranged in the other duct. In addition, a capacitor is arranged at a position adjacent to one of the ducts. Then, by operating each blower fan, cooling air flows in each duct, and the heat sink and reactor in each duct are forcibly cooled by this cooling air. Further, the condenser is cooled by the cooling air discharged from the outlet of one of the ducts and flowing through the housing.

Japanese Unexamined Patent Publication No. 2013-78216 Japanese Unexamined Patent Publication No. 2017-28996

Since the power conversion device described in Patent Document 1 requires two ducts and two blower fans in the housing, the number of parts increases, which causes an increase in cost.
An object of the present invention is to provide an electric device capable of efficiently cooling heat-generating components in a housing at low cost.

The electrical device of the present invention
With the housing
The substrate housed in the housing and
A fan for air-cooling the inside of the housing is provided.
A plurality of capacitors, a semiconductor element, and a heat sink for cooling the semiconductor element are arranged on the substrate.
The housing is arranged so as to face the first wall portion in which an intake port for taking in outside air into the housing by the fan is formed and the first wall portion, and exhausts the inside air to the outside of the housing. It has a second wall portion on which an exhaust port is formed.
The heat sink penetrates the inside of the heat sink between the first end face facing the intake port, the second end face facing the exhaust port, and the first end face and the second end face. Has an air flow and
The condenser is distributed between the intake port and the first end surface on both sides of the inlet of the air flow path on the first end surface.

According to the electric device of the present invention, the inside of the housing can be efficiently cooled at low cost.

It is a schematic circuit diagram of the electric device which concerns on one Embodiment of this invention. It is a perspective view which shows the appearance of an electric device. FIG. 2 is a cross-sectional view taken along the line III-III of FIG. FIG. 3 is a sectional view taken along line IV-IV of FIG. FIG. 3 is a sectional view taken along line VV of FIG. FIG. 2 is a sectional view taken along line VI-VI of FIG. It is a perspective view of the main circuit board. It is a top view which shows the result of having analyzed the flow of the cooling air in the housing of an electric device. It is a side view which shows the result of having analyzed the flow of the cooling air in the housing of an electric device.

[Summary of Embodiment]
The gist of the embodiment of the present invention includes at least the following.
(1) The electric device of the present invention is
With the housing
The substrate housed in the housing and
A fan for air-cooling the inside of the housing is provided.
A plurality of capacitors, a semiconductor element, and a heat sink for cooling the semiconductor element are arranged on the substrate.
The housing is arranged so as to face the first wall portion in which an intake port for taking in outside air into the housing by the fan is formed and the first wall portion, and exhausts the inside air to the outside of the housing. It has a second wall portion on which an exhaust port is formed.
The heat sink has a first end surface of the first wall portion facing the intake port, a second end surface of the second wall portion facing the exhaust port, the first end surface, and the first end surface. It has a ventilation flow path that penetrates the inside of the heat sink with the end face of 2.
The capacitors are distributed and arranged on both sides of the inlet of the air flow path on the first end surface between the intake port and the first end surface in the opposite direction.

In the electrical equipment having the above configuration, the outside air is taken into the housing from the intake port of the first wall portion by the operation of the fan, and after the heat generating parts in the housing are forcibly cooled, the exhaust port of the second wall portion is used. Is discharged to the outside of the housing. Since the plurality of capacitors are distributed and arranged on both sides of the inlet of the ventilation flow path on the first end surface of the heat sink between the intake port and the first end face in the opposite direction, the inlet of the ventilation flow path is distributed from the intake port. It is possible to form a flow path for cooling air up to. Therefore, the outside air taken in from the intake port is guided to the inlet of the ventilation flow path on the first end face by the plurality of capacitors, and the wind speed of the cooling air flowing in the ventilation flow path is increased. Therefore, the semiconductor element can be efficiently cooled via the heat sink. In addition, since the condenser is directly exposed to lower temperature air, it is efficiently cooled. Since the cooling air flow path from the intake port to the first end face of the heat sink is formed by the condenser, the number of parts is reduced compared to the case of using a duct, guide plate, etc., and the structure is simplified and the cost is reduced. It can be reduced. It should be noted that the plurality of capacitors do not necessarily have to be arranged as a whole between the intake port and the first end face in the opposite direction, and are arranged at least between the intake port and the first end face in the opposite direction. It is sufficient that the portions are distributed and arranged on both sides of the inlet of the ventilation flow path.

(2) A plurality of the capacitors are arranged on both sides of the inlet of the ventilation flow path, and the capacitor arranged on one side of both sides of the inlet of the ventilation flow path and the capacitor arranged on the other side. It is preferable that the interval gradually narrows from the intake port toward the inlet of the ventilation flow path.
With such a configuration, the flow path of the cooling air can be gradually narrowed from the intake port to the inlet of the ventilation flow path, and the wind speed of the cooling air when flowing into the inlet of the ventilation flow path can be further increased. it can.

(3) A plurality of reactors arranged on both sides of the heat sink between the first end surface and the second end surface on the substrate.
It is preferable that a metal cover member attached to the heat sink and covering the reactor is further provided.
With such a configuration, the cover member is cooled by the heat sink, the radiant heat radiated from the reactor is absorbed by the cover member, and the cooling of the reactor is promoted.

(4) The cover member is attached to the outer surface of the heat sink located between the plurality of reactors, and the outer surface is in a posture perpendicular to the direction from the first end face to the second end face. It is preferable that the cover member is provided with a cooling plate protruding from the cover member.
With such a configuration, the cooling air passing along the outer surface of the heat sink from the first end face to the second end face positively hits the cooling plate, and promotes the cooling of the cover member and the cooling of the reactor. it can. Further, since the direction of the flow of the cooling air that hits the cooling plate is bent, the cooling air can easily flow to the reactors arranged on both sides of the heat sink, and the cooling of the reactor can be further promoted.

(5) A plurality of reactors arranged on both sides of the heat sink between the first end surface and the second end surface on the substrate are further provided.
The housing comprises another wall portion arranged between the first wall portion and the second wall portion.
A shielding plate arranged in the gap between the condenser and the other wall portion when viewed from the intake port side is arranged between the condenser and the reactor in the direction from the intake port to the exhaust port. Is preferable.
With such a configuration, the cooling air that tries to pass through the gap between the condenser and other walls when viewed from the intake port is blocked by the shielding plate, the cooling air wraps around behind the condenser, and the cooling air easily flows to the reactor. Become. This can promote the cooling of the reactor. In addition, an explosion-proof valve is generally provided at the tip of the capacitor, and when the explosion-proof valve opens due to expansion, the electrolytic solution may be ejected. However, when the electrolytic solution is blocked by the shielding plate, the electrolytic solution exceeds the capacitor. It is possible to prevent the electrolytic solution from adhering to other parts on the substrate and causing a problem such as a short circuit.

[Details of Embodiment]
FIG. 1 is a schematic circuit diagram of an electric device according to an embodiment of the present invention.
The electric device of the present embodiment is a power conversion device, and this power conversion device is provided between two first input / output circuits A to which a storage battery or the like is connected and one second input / output circuit B. The main circuit board X is provided. The main circuit board X includes a capacitor C connected to each first input / output circuit A, a switching element D, and a diode E. Further, a bidirectional DC / DC converter F is provided after the diode E. The DC / DC converter F is composed of a DC reactor G and switching elements H1 and H2. A capacitor J is provided after the DC / DC converter F. The switching elements H1 and H2 are controlled by a control unit (not shown), and are alternately turned on to perform a step-up chopper operation. When charging the storage battery of the first input / output circuit A, the switching element H1 can be controlled on and off, and the switching element H2 can be fixed off to perform step-down. As the switching elements D, H1 and H2, for example, an IGBT which is a semiconductor element or a MOSFET can be used.

2 is a perspective view showing the appearance of the electric device 10, FIG. 3 is a sectional view taken along line III-III of FIG. 2, FIG. 4 is a sectional view taken along line IV-IV of FIG. 3, and FIG. 5 is V of FIG. -V line sectional view, FIG. 6 is a VI-VI line sectional view of FIG.
As shown in FIG. 2, the electric device 10 includes a housing 20 formed in a cube or a rectangular parallelepiped and having six wall portions. The wall portion has a top wall 21 and a bottom wall 22 formed in a rectangular shape in a plan view, and four outer peripheral walls 23 to 26 connecting the four sides of the top wall 21 and the bottom wall 22 to each other. ..

An intake port 31 for taking in cooling air is formed in the outer peripheral wall 23 of one of the four outer peripheral walls 23 to 26, and the other outer peripheral wall 23 faces the outer peripheral wall 23. An exhaust port 32 for exhausting the air used for cooling the inside of the housing 20 is formed on the outer peripheral wall 24, and a blower fan 33 is provided in the exhaust port 32.
In the following description, the intake port 31 side is the front side and the exhaust port 32 side is the rear side. Therefore, the outer peripheral wall 23 on which the intake port 31 is formed becomes the front wall, the outer peripheral wall 24 on which the exhaust port 32 is formed becomes the rear wall, and the other two outer peripheral walls 25 and 26 are the left wall and the right wall, respectively. Become.

As shown in FIG. 3, between the top wall 21 and the bottom wall 22 of the housing 20, there are two partition walls 27 and 28 that vertically partition the inside of the housing 20 into three rooms R1 to R3. It is provided. In the present embodiment, the three rooms R1 to R3 are referred to as an upper room R1, a middle room R2, and a lower room R3 from the top. The control board 34 is housed in the upper chamber R1, the main circuit board 35 having the above-mentioned DC / DC converter F and the like is housed in the middle room R2, and the main circuit board 35 is housed in the lower room R3. An input / output board 36 for inputting / outputting a DC voltage is housed.

In the following, the middle chamber R2 is regarded as one housing, and the cooling structure of the electric components arranged inside the housing will be described. Therefore, the housing made of the middle chamber R2 is designated by a reference numeral 20A different from that of the housing 20. Further, in the housing 20A, the upper and lower partition walls 27 and 28 form the upper wall and the bottom wall, respectively. Therefore, the upper wall and the lower wall of the housing 20A have the same reference numerals 27 and 28 as the partition walls. Will be attached. Since the front and rear walls and the left and right walls of the housing 20A are composed of a part of the middle stages of the front and rear walls 23 and 24 and the left and right walls 25 and 26, respectively, the same reference numerals are applied.

The main circuit board 35 is provided on the bottom wall 28 of the housing 20A in a substantially horizontal posture via the support legs 37. As shown in FIG. 7, a plurality of capacitors 12, a plurality of switching elements 13, and a plurality of reactors 16 are arranged on the main circuit board 35. Further, a heat sink 19 for cooling the switching element 13 is provided on the main circuit board 35. The main circuit board 35, the capacitor 12, the reactor 16, and the switching element 13 all correspond to the main circuit board X, the capacitors C, J, the reactor G, and the switching elements D, H1, and H2 in FIG. ..

As shown in FIGS. 4 and 5, the heat sink 19 is arranged in a substantially central portion in the left-right direction in the housing 20A, and is composed of a rectangular parallelepiped-shaped block elongated in the front-rear direction. As shown in FIG. 6, a plurality of air flow paths 19a penetrating in the front-rear direction are vertically formed inside the heat sink 19. Specifically, inside the heat sink 19, a plurality of horizontally arranged plate-shaped blades 19b are provided at intervals in the vertical direction, and a ventilation flow path 19a is formed between the upper and lower blades 19b. There is. The ventilation flow path 19a opens at the front end surface (first end surface) 19c and the rear end surface (second end surface) 19d of the heat sink 19, and the opening at the front end surface 19c serves as the inlet of the ventilation flow path 19a, and the rear end surface 19d. Is the outlet of the ventilation flow path 19a.

As shown in FIGS. 3 and 4, the front end surface 19c of the heat sink 19 and the front wall 23 of the housing 20A are spaced apart from each other in the front-rear direction, and the rear end surface 19d of the heat sink 19 and the rear wall of the housing 20A are spaced apart from each other. There is also a space between the 24 and the 24 in the front-rear direction. Switching elements 13 are attached to the left and right side surfaces of the heat sink 19, and the switching elements 13 are cooled by the heat sink 19.

The intake port 31 formed on the front wall 23 of the housing 20A is formed at a substantially central portion of the front wall 23 in the left-right direction. Further, the exhaust port 32 formed on the rear wall 24 of the housing 20A is formed at a substantially central portion in the left-right direction of the rear wall 24. The blower fan 33 provided in the exhaust port 32 is configured to blow out the air inside the housing 20A to the outside of the housing 20A. Then, the outside air is drawn into the housing 20A from the intake port 31 by the operation of the blower fan 33.

As shown in FIG. 2, an intake port 38 is also formed on the front wall 23 at a position corresponding to the lower chamber R3. As shown in FIG. 6, the exhaust port 32 is formed at a position straddling the middle chamber R2 and the lower chamber R3, and the blower fan 33 attached to the exhaust port 32 is also located at a position straddling the middle chamber R2 and the lower chamber R3. Have been placed. Then, by operating the blower fan 33, outside air is taken into the middle chamber R2 and the lower chamber R3 via the intake ports 31 and 38, and both are discharged from the exhaust port 32.

As shown in FIG. 4, six capacitors 12 are arranged on the main circuit board 35. The condenser 12 is arranged between the intake port 31 and the front end surface 19c of the heat sink 19 in the front-rear direction. Further, three capacitors 12 are arranged on the left and right sides of the front end surface 19c of the heat sink 19. On the left and right sides of the front end surface 19c of the heat sink 19, three capacitors 12 are arranged in a substantially triangular shape so that one capacitor 12 is closer to the intake port 31 and the two capacitors 12 are closer to the heat sink 19. There is. Further, the distances L1 and L2 in the left-right direction of the capacitors 12 on both sides of the front end surface 19c of the heat sink 19 are gradually narrowed from the intake port 31 toward the front end surface 19c of the heat sink 19. Since the inlet of the ventilation flow path 19a is formed on the front end surface 19c of the heat sink 19, the plurality of capacitors 12 are distributed and arranged on the left and right sides of the inlet of the ventilation flow path 19a.

As shown in FIG. 5, the three capacitors 12 arranged on the left and right sides of the front end surface 19c of the heat sink 19 are arranged so that a part of the three capacitors 12 overlap each other in the front-rear direction when viewed from the intake port 31. The height of the capacitor 12 is slightly lower than the height of the heat sink 19. Further, the upper end of the intake port 31 is slightly higher than the upper end of the capacitor, and the left-right width is wider than the left-right width of the heat sink 19.

As shown in FIGS. 4 and 7, one reactor 16 is arranged on each of the left and right sides of the heat sink 19 between the front end surface 19c and the rear end surface 19d with the heat sink 19 interposed therebetween. The reactor 16 is formed in a cylindrical shape and is arranged so that its center faces in the front-rear direction. Further, a cavity is formed in the center of the reactor 16, and air can pass through the cavity. The reactor 16 is arranged substantially at the center of the housing 20A in the front-rear direction, specifically, slightly behind the center of the housing 20A in the front-rear direction (exhaust port 32 side). The reactor 16 may have an electric wire wound around a cylindrical iron core, or may be formed into a cylindrical shape by winding the electric wire in a coil shape.

As shown in FIGS. 4, 5, and 7, a cover member 40 is attached to the upper surface of the heat sink 19. The cover member 40 has a fixing portion 41 fixed to the heat sink 19 and cover portions 42 provided on both the left and right sides of the fixing portion 41. The fixing portion 41 and the cover portion 42 are integrally formed of a metal plate material. The cover portion 42 is arranged above the left and right reactors 16 and covers the reactors 16 from above. A bent piece (cooling plate) 41a that bends upward is provided on the front end edge of the fixed portion 41. The bent piece 41a is arranged along the left-right direction. A bent piece 42a that bends downward is provided on the front end edge of the cover portion 42.

As shown in FIG. 5, a shielding plate 44 is provided in the gap between the condenser 12, the upper wall 27, and the left and right side walls 25, 26 when viewed from the intake port 31 side. The shielding plate 44 is attached to the upper wall 27 of the housing 20A and projects downward from the upper wall 27. The shielding plate 44 includes an upper shielding portion 44a arranged on the upper side of the capacitor 12 and a lateral shielding portion 44b arranged on the left and right outer sides of the capacitor 12. As shown in FIG. 6, the shielding plate 44 is arranged slightly behind the front end surface 19c of the heat sink 19 and in front of the reactor 16 in the side view. Further, as shown in FIG. 5, the shielding plate 44 is not provided above the heat sink 19, and the cooling air flow passage P2 is provided between the heat sink 19, the upper wall 27, and the left and right shielding plates 44. Is formed.

Further, as shown in FIGS. 4 and 6, a shielding plate 45 formed in substantially the same shape as the shielding plate 44 is provided behind the reactor 16 and in front of the rear end surface 19d of the heat sink 19. .. However, the shielding plate 45 is also provided in a portion corresponding to the flow passage P2.

In the electric device 10 of the present embodiment, as shown in FIGS. 4 and 5, a plurality of capacitors 12 are formed in the front wall 23 of the housing 20A in the front-rear direction of the intake port 31 and the front end surface 19c of the heat sink 19. The heat sink 19 is distributed between the left and right sides of the inlet of the ventilation flow path 19a in the front end surface 19c of the heat sink 19. Therefore, the plurality of capacitors 12 form a cooling air flow passage P1 between the intake port 31 and the inlet of the ventilation flow path 19a, and guide the cooling air taken in from the intake port 31 to the inlet of the ventilation flow path 19a. It acts (see arrow a). Therefore, the number of parts in the housing 20A is reduced as compared with the case where a duct or a guide plate for guiding the flow of the cooling air to the heat sink 19 is provided in the housing 20A, and the structure is simplified and the cost is reduced. Can be done.

Further, since the cooling air is guided to the inlet of the ventilation flow path 19a in the front end surface 19c of the heat sink 19 by the plurality of capacitors 12, the cooling of the heat sink 19 and the cooling of the switching element 13 are promoted. In particular, in the capacitors 12 on both the left and right sides, the distances L1 and L2 in the left-right direction gradually decrease from the intake port 31 toward the front end surface 19c, so that the flow passage P1 is narrowed in the left-right direction and enters the heat sink 19. The wind speed when the cooling air flows in can be increased. Further, the condenser 12 is efficiently cooled because the lower temperature air flowing in from the intake port 31 directly hits the condenser 12.

A metal cover member 40 is fixed to the heat sink 19, and the cover member 40 is cooled by the heat sink 19. Further, the cover member 40 covers the upper part of the left and right reactors 16. Therefore, the radiant heat radiated from the reactor 16 is absorbed by the cover member 40 arranged above the reactor 16, and the cooling of the reactor 16 is promoted.

A bent piece (cooling plate) 41a that bends upward is provided on the front end edge of the fixing portion 41 of the cover member 40. As shown in FIG. 5, the bent piece 41a is arranged in the cooling air flow passage P2 formed above the heat sink 19 when viewed from the intake port 31 side. Therefore, the cooling air flowing backward along the upper surface of the heat sink 19 hits the bent piece 41a, so that the cooling of the cover member 40 is promoted. Further, the cooling air flowing backward along the upper surface of the heat sink 19 is bent in direction by hitting the bending piece 41a. Therefore, the cooling air easily flows to the reactors 16 arranged on the left and right sides of the bent piece 41a, and the cooling of the reactor 16 is further promoted.

As shown in FIG. 5, a shielding plate 44 is provided in the gap between the condenser 12 and the upper wall 27 and the side walls 25 and 26, so that the cooling air passing above the condenser 12 is as shown in FIG. , It is shielded by the upper shielding portion 44a of the shielding plate 44, and the direction is bent downward (see arrow b). Therefore, an air flow is formed in the space S formed between the condenser 12 and the reactor 16, and the cooling of the reactor 16 is promoted. Further, since the shielding plate 45 can suppress the cooling air passing above the heat sink 19 and the reactor 16, it is possible to make it easier for the cooling air to flow into the space S.

Further, an explosion-proof valve 12a is provided on the upper surface of the capacitor 12, and when the explosion-proof valve 12a is opened due to the expansion of the capacitor 12, the electrolytic solution is ejected. At this time, it becomes difficult for the electrolytic solution ejected from the upper surface of the capacitor 12 to advance to the rear of the shielding plate 44, and it is possible to prevent the electrolytic solution from adhering to the parts on the main circuit board 35 and causing a problem such as a short circuit. Can be done.

[Analysis of cooling air]
8 and 9 show the results of analyzing the flow of the cooling air in the housing 20A of the electric device 10. In particular, FIG. 8 shows the velocity distribution of the cooling air in the housing 20A identified by the shade of color in order to investigate the influence of the arrangement of the condenser 12 on the flow of the cooling air. In FIG. 8, the dark-colored regions C1, C2, and C3 surrounded by the alternate long and short dash line are particularly high wind speed regions, and in the region C1 from the intake port 31 to the heat sink 19, cooling air is generated by the left and right capacitors 12. It is guided and it can be seen that the wind speed is high. Therefore, it is considered that the wind speed becomes high even in the region C2 including the heat sink 19, and the cooling of the switching element in contact with the heat sink 19 can be promoted.

Further, FIG. 9 shows the velocity distribution of the cooling air in the housing 20A identified by the shade of color in order to investigate the influence of the shielding plate 44 on the flow of the cooling air. In particular, FIG. 9A shows the case where the shielding plates 44 and 45 are present, and FIG. 9B shows the case where the shielding plates 44 and 45 are not present. In the case of FIG. 9B, the wind speed is high in the light-colored region C7 surrounded by the alternate long and short dash line, that is, above the reactor 16. That is, it is considered that the cooling air passes above the reactor 16 and the cooling air is hard to hit the reactor 16, so that the reactor 16 cannot be cooled efficiently. On the other hand, in the case of FIG. 9A, the speed of the cooling air is high in the light-colored regions C4 and C5 surrounded by the alternate long and short dash line, and the region C6 between the condenser 12 and the reactor 16 is shown in FIG. 9 (A). The wind speed is higher than in the case of B). That is, the flow of the cooling air is bent downward by being blocked by the shielding plate 44, and the passage of the cooling air above the reactor 16 is suppressed by being blocked by the shielding plate 45. It is considered that this increases the wind speed in the region C6 on the front side of the reactor 16 and promotes the cooling of the reactor 16.

It should be noted that the embodiments disclosed this time are exemplary in all respects and are not restrictive. The scope of the present invention is indicated by the scope of claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.
For example, the number of capacitors in the above embodiment is not limited to six, and may be two or more. Further, the arrangement of the capacitors can be changed as long as the cooling air can be guided from the intake port to the front end surface of the heat sink. For example, the entire capacitor may be arranged between the intake port and the front end surface of the heat sink in the front-rear direction, or only a part of the capacitor may be arranged.

In the electric device of the above embodiment, the inside of the housing is divided into three upper and lower stages, but it does not have to be divided.
Further, in the above embodiment, for convenience, the outer peripheral wall of the housing in which the intake port is formed is used as the front wall, and the outer peripheral wall of the housing in which the exhaust port is formed is used as the rear wall, but the present invention is limited thereto. is not it. For example, an intake port may be formed on the upper wall of the housing, and an exhaust port may be formed on the bottom wall.
The electric device is not limited to the DC / DC converter, and may be another power conversion device such as a DC / AC converter, and is not limited to the power conversion device, and includes a capacitor, a semiconductor element, and a heat sink. It may be other electrical equipment provided in the housing.

10: Power converter (electrical equipment)
12: Capacitor 12a: Explosion-proof valve 13: Switching element 16: Reactor 19: Heat sink 19a: Ventilation flow path 19b: Blade 19c: Front end face (first end face)
19d: Rear end face (second end face)
20: Housing 20A: Housing 21: Top wall 22: Bottom wall 23: Outer wall (front wall; first wall)
24: Outer wall (rear wall; second wall)
25: Outer wall (left wall)
26: Outer wall (right side wall)
27: Section wall (upper wall)
28: Section wall (bottom wall)
31: Intake port 32: Exhaust port 33: Blower fan 34: Control board 35: Main circuit board 36: Input / output board 37: Support leg 38: Intake port 40: Cover member 41: Fixed part 41a: Bending piece 42: Cover part 42a: Bent piece 44: Shielding plate 44a: Upper shielding portion 44b: Horizontal shielding portion 45: Shielding plate A: First input / output circuit B: Second input / output circuit C: Capacitor C1: Area C2: Area C3: Area C5: Region C6: Region D: Switching element E: Diode F: DC / DC converter G: DC reactor H1: Switching element H2: Switching element J: Capacitor L1: Spacing L2: Spacing P1: Flow passage P2: Flow passage R1: Upper chamber R2: Middle room R3: Lower room S: Space

Claims (5)

With the housing
The substrate housed in the housing and
A fan for air-cooling the inside of the housing is provided.
A plurality of capacitors, a semiconductor element, and a heat sink for cooling the semiconductor element are arranged on the substrate.
The housing is arranged so as to face the first wall portion in which an intake port for taking in outside air into the housing by the fan is formed and the first wall portion, and exhausts the inside air to the outside of the housing. It has a second wall portion on which an exhaust port is formed.
The heat sink has a first end surface of the first wall portion facing the intake port, a second end surface of the second wall portion facing the exhaust port, the first end surface, and the first end surface. It has a ventilation flow path that penetrates the inside of the heat sink with the end face of 2.
An electric device in which the capacitors are distributed and arranged on both sides of the inlet of the ventilation flow path on the first end surface between the intake port and the first end surface in the opposite direction. A plurality of the capacitors are arranged on both sides of the inlet of the ventilation flow path, and the distance between the capacitors arranged on one side of both sides of the inlet of the ventilation flow path and the capacitors arranged on the other side is set. The electric device according to claim 1, wherein the electric device gradually narrows from the intake port toward the inlet of the air flow path. A plurality of reactors arranged on both sides of the heat sink between the first end surface and the second end surface on the substrate.
The electrical device according to claim 1 or 2, further comprising a metal cover member attached to the heat sink and covering the reactor. The cover member is attached to the outer surface of the heat sink located between the plurality of reactors, and projects from the outer surface in a posture perpendicular to the direction from the first end face to the second end face. The electrical device according to claim 3, wherein a cooling plate is provided on the cover member. A plurality of reactors arranged on both sides of the heat sink between the first end surface and the second end surface on the substrate are further provided.
The housing comprises another wall portion arranged between the first wall portion and the second wall portion.
A shielding plate arranged in the gap between the condenser and the other wall portion when viewed from the intake port side is arranged between the condenser and the reactor in the direction from the intake port to the exhaust port. , The electric device according to any one of claims 1 to 4.