JP2020036456A - Installation type power conversion device - Google Patents

Abstract

To provide an installation type power conversion device preventing a trouble of electric circuit component by the ingress of water to a certain degree.SOLUTION: An installation type power conversion device according to the present invention is provided with: a box type housing 2 installed on an installation surface; a partition wall part 20 for partitioning a space in the housing 2 into a circuit component accommodation space 21 for accommodating electric circuit components (11, 12, 13, 14) and a duct space 22 extended vertically; an air suction port 8 for communicating a lower part of the duct space 22 to the outside; an air discharge port 9 for communicating an upper part of the duct space 22 to the outside; and a water proof box 26 disposed on the lower part of the circuit component accommodation space 21. The water proof box 26 includes a bottom plate and side plates vertically installed on all edge parts of the bottom plate. Some parts (11, 14) of the electric circuit components are accommodated in the water proof box 26.SELECTED DRAWING: Figure 5

Description

  The present invention relates to an installation-type power conversion device used by being installed on an installation surface such as the ground, and more particularly, to an installation-type power conversion device used for charging a vehicle-mounted battery of an electric vehicle.

  In order to charge a vehicle-mounted battery of an electric vehicle such as an electric vehicle, a hybrid car, and a plug-in hybrid car, a stationary power conversion device that is sometimes called a charging stand is used. The stationary power conversion device includes a housing installed on an installation surface, and electric circuit components for power conversion housed in the housing.

  The housing usually has a box shape. In addition, in order to sufficiently cool electric circuit components that process high power, the housing usually has an intake port for taking in fresh external air, and an exhaust port for discharging air warmed by the electric circuit components to the outside. A mouth is provided (for example, see Patent Document 1).

JP 2018-50380 A

  By the way, in response to an increase in flooding of a river due to heavy rain in recent years, a need for a waterproof type power conversion device has been increasing. The simplest waterproofing measure is to completely seal the housing to prevent water from entering, but such measures will hinder cooling of electric circuit components. As another waterproofing measure, it is conceivable to lengthen the housing and to concentrate the electric circuit components that break down when immersed in water at the top of the housing. And it is easy to fall during an earthquake. In addition, an increase in the length of the housing (increase in size) leads to an increase in manufacturing costs.

  The present invention has been made in view of the above circumstances, and provides an installation-type power conversion device that does not cause the above-described inconvenience and does not cause failure of electric circuit components due to intrusion of water to some extent. The task is to provide.

  In order to solve the above problems, a stationary power conversion device according to the present invention includes a box-shaped housing installed on an installation surface, and a space in the housing, which is a circuit component housing space for housing electric circuit components. And a partition that separates the duct space extending in the vertical direction, a first vent formed in the housing that communicates the lower part of the duct space to the outside, and a housing that communicates the upper part of the duct space to the outside. And a waterproof box disposed below the circuit component housing space. The waterproof box includes a bottom plate and side plates erected on all edges of the bottom plate. Part of the circuit components is housed in a waterproof box.

  In this configuration, the waterproof box disposed below the circuit component housing space includes a bottom plate and side plates erected on all edges of the bottom plate. Therefore, according to this configuration, even if water enters the circuit component housing space, the electric circuit components housed in the waterproof box will not be immersed in water until the water level exceeds the height of the side plate.

  In this configuration, the duct space communicating with the outside via the first ventilation port and the second ventilation port is separated from the circuit component housing space by the partition wall. Therefore, according to this configuration, even if water intrudes into the duct space from the first ventilation port and the second ventilation port, the electric circuit components accommodated in the circuit component accommodation space are not immediately immersed in water.

  The installation type power converter further includes a substrate having a component mounting surface and a heat radiating surface, and a heat sink protruding from the heat radiating surface of the substrate, and other electric circuit components except for the electric circuit components housed in the waterproof box. A part is mounted on the component mounting surface, the board is disposed in the circuit component housing space so as to close the opening formed in the partition, and the heat sink projects into the duct space through the opening. May be provided.

  According to this configuration, the electric circuit components mounted on the component mounting surface can be air-cooled by the air flowing in the duct space extending in the vertical direction.

  In addition, the installation type power converter further includes a fan disposed in the second ventilation port, and when the fan rotates, air taken into the duct space from the first ventilation port rises while passing between the heat sinks. May be provided.

  According to this configuration, the amount and speed of the air flowing between the heat sinks can be increased, and the electric circuit components mounted on the component mounting surface can be efficiently cooled by air.

  Note that the electric circuit component relates to a first component relating to an input-side filter circuit for shaping AC power or DC power input from outside, and a power conversion circuit for converting shaped AC power or DC power to desired DC power. When the second component and the third component relating to the output-side filter circuit for shaping the desired DC power and outputting it to the outside are included, the first component or the third component is housed in the waterproof box, and the second component is It is preferably mounted on the component mounting surface of the substrate.

  According to this configuration, it is possible to positively air-cool the second component that generates a larger amount of heat than the first component and the third component, and to operate it stably.

  Advantageous Effects of Invention According to the present invention, it is possible to provide a stationary power converter in which an electric circuit component does not break down due to intrusion of water to a certain extent.

It is a perspective view showing the appearance of the stationary type power converter concerning the example of the present invention. It is an (A) front view, (B) rear view, (C) left side view, and (D) right side view showing the appearance of a stationary power converter according to an embodiment. FIG. 3 is a block diagram of an electric circuit that performs power conversion in the stationary power converter according to the embodiment. FIG. 2A is a front view showing a state in which a front panel is removed, and FIG. It is the (A) longitudinal section and the (B) typical longitudinal section showing the internal structure of the installation type power converter concerning an example. FIG. 2 is a perspective view of a waterproof box provided in the stationary power converter according to the embodiment. It is the perspective view seen from (A) the front side, and (B) seen from the back side, showing the internal structure of the waterproof box provided in the stationary power converter according to the embodiment. FIG. 3 is an exploded perspective view illustrating a main part of a waterproof box provided in the stationary power converter according to the embodiment. It is a longitudinal section showing the internal structure of the waterproof box provided in the stationary type power converter concerning the example.

  Hereinafter, an embodiment of a stationary power converter according to the present invention will be described with reference to the accompanying drawings.

  1 and 2 show a stationary power converter 1 according to an embodiment of the present invention. As shown in FIG. 1, the stationary power converter 1 is drawn out from a box-shaped housing 2 installed on the ground via a pair of left and right legs 3, 3 and an upper right side of the housing 2. A charging cable 5, a charging connector 6 provided at an end of the charging cable 5, and a terminal block cover 7 provided at a lower portion on the right side of the housing 2 are provided. The stationary power conversion device 1 converts AC100V or AC200V AC power or DC power input to the terminal block 10 (see FIG. 3) hidden in the terminal block cover 7 into DC power required by the on-board battery of the electric vehicle. At the same time, the DC power is output from the charging connector 6 to charge the vehicle-mounted battery of the electric vehicle.

  The housing 2 has a front panel 2a and a rear panel 2b that are removed during maintenance or the like. An operation panel 4 including a plurality of operation buttons is provided above the front panel 2a. In addition, an intake port 8 for taking in outside fresh air into the housing 2 is formed at a lower portion of the rear panel 2b, and an air heated inside the housing 2 is formed at an upper portion of the rear panel 2b. An exhaust port 9 for discharging the gas to the outside is formed.

  The above-described power conversion is performed by electric circuit components housed inside the housing 2. As shown in FIG. 3, the electric circuit components include a component related to an input-side filter circuit 11 for shaping AC power or DC power input from the outside via the terminal block 10, and AC power or DC power after shaping. Parts related to the power conversion circuit 12 for converting into DC power of a relatively high voltage (400 V in the present embodiment), and an output-side filter circuit 13 that shapes the DC power obtained by the power conversion circuit 12 and outputs the DC power to the outside. Parts and are included. The electric circuit components include a component related to the auxiliary power supply circuit 14 that generates a relatively low voltage (12 V in this embodiment) DC power from the shaped AC power or DC power, and an operation of the power conversion circuit 12. And a component related to the control circuit 15 for controlling.

  The waterproof box 26 surrounding the input side filter circuit 11 and the auxiliary power supply circuit 14 will be described later in detail.

  The input side filter circuit 11 has an input end connected to the terminal block 10 and an output end connected to the power conversion circuit 12 and the auxiliary power supply circuit 14. The power conversion circuit 12 has an input terminal connected to the input filter circuit 11 and an output terminal connected to the output filter circuit 13. The output side filter circuit 13 has an input end connected to the power conversion circuit 12 and an output end connected to the charging cable 5.

  The auxiliary power supply circuit 14 has an input terminal connected to the input-side filter circuit 11 and an output terminal connected to the control circuit 15. The output terminal of the auxiliary power supply circuit 14 is also connected to a fan 23 described later. The control circuit 15 is connected to the operation panel 4 and the power conversion circuit 12. The control circuit 15 opens and closes a plurality of switching elements included in the power conversion circuit 12 based on a command regarding start / stop of charging and the like received by the operation panel 4.

  4 and 5 show the internal structure of the stationary power converter 1 according to the present embodiment. As shown in FIG. 5A, which is a longitudinal sectional view, and FIG. 5B, which is a schematic view thereof, the stationary power conversion device 1 divides the space inside the housing 2 into electric circuit components (11, 12). , 13, 14, 15), and a partition wall 20 which is separated from a circuit space 21 for accommodating a circuit component and a duct space 22 extending in the vertical direction. In this embodiment, of the space inside the housing 2, a portion close to the rear panel 2 b is a duct space 22, and the other portion is a circuit component housing space 21. 4 and 5, the illustration of components related to the control circuit 15 is omitted.

  The stationary power converter 1 according to the present embodiment further includes the fan 23 described above. The fan 23 is arranged in the duct space 22 along the exhaust port 9. The lower part of the duct space 22 communicates with the outside of the housing 2 through the intake port 8, and the upper part of the duct space 22 communicates with the outside of the housing 2 through the exhaust port 9.

  The stationary power converter 1 according to the present embodiment further includes the waterproof box 26 described above. The waterproof box 26 is arranged at the lowermost part of the circuit component housing space 21. Further, the waterproof box 26 accommodates components relating to the input-side filter circuit 11 and components relating to the auxiliary power supply circuit 14.

  The stationary power converter 1 according to the present embodiment further includes a substrate 24 and a heat sink 25. The board 24 has a component mounting surface 24a and a heat radiation surface 24b, and components related to the power conversion circuit 12 are mounted on the component mounting surface 24a. As shown in FIG. 4B, a heat sink 25 having a plurality of fins arranged at equal intervals in the left-right direction is provided on the heat radiation surface 24b. When the components related to the power conversion circuit 12 generate heat, the heat is transmitted to the heat sink 25 via the substrate 24. The substrate 24 and the heat sink 25 are preferably made of a material having high thermal conductivity. In addition to the heat conduction from the board 24 to the heat sink 25, the heat sink 25 may be made to directly contact the components mounted on the board 24 to dissipate heat.

  The substrate 24 is arranged in the circuit component housing space 21 so as to close an opening formed in the partition wall 20. The heat sink 25 protrudes into the duct space 22 through an opening formed in the partition 20. Therefore, when the fan 23 rotates, the fresh air taken into the duct space 22 from the intake port 8 rises while passing through the space between the heat sinks 25, whereby the components related to the heat sink 25, the substrate 24, and the power conversion circuit 12 are formed. Is air cooled.

  Providing the intake port 8 below the housing 2 (the rear panel 2b) as in this embodiment is disadvantageous in terms of flooding. However, if the position of the intake port 8 is shifted upward in consideration of flooding, the distance between the intake port 8 and the exhaust port 9 (that is, the length of the duct space 22) becomes short, and the effect of the heat sink 25 is maximized. Can not be demonstrated to the limit. For this reason, in the present embodiment, by arranging the intake port 8 at the lower part of the housing 2, the length of the duct space 22 is increased, the flow of air passing through the heat sink 25 is adjusted, and the heat radiation effect is improved. .

  As described above, in the stationary power conversion device 1 according to the present embodiment, the components related to the power conversion circuit 12 that generate more heat than other components are actively cooled by the air flowing through the duct space 22. On the other hand, components related to the input-side filter circuit 11, the output-side filter circuit 13, and the auxiliary power supply circuit 14, which generate relatively little heat, are not actively cooled.

  Here, the components related to the input-side filter circuit 11 are arranged in the lower part of the circuit component accommodation space 21 (that is, accommodated in the waterproof box 26) because it is preferable to be close to the terminal block 10 hidden by the terminal block cover 7. is there. The components related to the auxiliary power supply circuit 14 are housed in the waterproof box 26 because it is preferable that the components related to the input-side filter circuit 11 are close to the components. Further, the components related to the output side filter circuit 13 are arranged above the circuit component accommodation space 21 because it is preferable that the components are close to the outlet of the charging cable 5. In the present embodiment, the terminal block 10 is located above the waterproof box 26.

  As shown in FIG. 6, FIG. 7, FIG. 8 and FIG. 9, the waterproof box 26 accommodating the components related to the input-side filter circuit 11 and the auxiliary power supply circuit 14 has a rectangular bottom plate 26a and four edges of the bottom plate 26a. Have four side plates 26b, 26c, 26d, 26e. The bottom plate 26a and the four side plates 26b, 26c, 26d, 26e are all made of metal. Further, there is no gap between the bottom plate 26a and each of the side plates 26b, 26c, 26d, 26e, and between adjacent side plates (for example, 26b and 26c).

  The configuration of the main part of the waterproof box 26 will be described in more detail with reference to FIG. As shown in the figure, the main part of the waterproof box 26 is composed of a first part forming side plates 26b, 26c and 26e, and a second part forming a bottom plate 26a and a side plate 26d. The first component and the second component are each formed by bending one metal plate. Therefore, there is no gap between the side plates 26b and 26c, between the side plates 26b and 26e, and between the bottom plate 26a and the side plates 26d. In addition, joints generated when the first component and the second component are combined are provided with measures for closing the gap. That is, the joint between the edge of the bottom plate 26a and the edge of the side plates 26b, 26c, 26e, the joint between the edge of the side plate 26c and the edge of the side plate 26d, and the edge of the side plate 26e and the edge of the side plate 26d. The gap between the joints is closed by welding and water stop caulking. As shown in FIG. 9, the horizontal ends of the side plates 26e and 26c (not shown) extend beyond the side plate 26d. As a result, a margin is left between each of the side plates 26c and 26e and the side plate 26d, and welding can be reliably performed.

  The waterproof box 26 further includes a substrate mounting plate 27, a first top plate 28 formed integrally with the substrate mounting plate 27, and a second top plate 29. The board mounting plate 27 has a first component mounting surface 27a and a second component mounting surface 27b. Components relating to the input-side filter circuit 11 are mounted on the first component mounting surface 27a of the board mounting plate 27, and components relating to the auxiliary power supply circuit 14 are mounted on the second component mounting surface 27b of the board mounting plate 27. The board mounting plate 27 and the first top plate 28 are connected at the upper end of the board mounting plate 27.

  In particular, as shown in FIG. 9, the lower end of the board mounting plate 27 is screwed to a screw portion provided on the bottom plate 26a. The first top plate 28 is screwed to the upper end of the rear side plate 26b. The second top plate 29 is screwed to the upper end of the front side plate 26b. The second top plate 29 partially overlaps the first top plate 28, and is also screwed to the first top plate 28.

  As described above, there is no gap between the bottom plate 26a and each side plate 26b and between the adjacent side plates 26b, 26b. There are no gaps between the first top plate 28 and the side plate 26b, between the second top plate 29 and the side plate 26b, and between the first top plate 28 and the second top plate 29. Therefore, water does not enter the inside of the waterproof box 26 from between them. However, the first top plate 28 and the second top plate 29 have some through holes for passing wiring. Therefore, when the water level of the water that has entered the circuit component housing space 21 exceeds the height of the side plate 26b, the water enters the inside of the waterproof box 26 from the through holes of the first top plate 28 and the second top plate 29. In other words, the components related to the input-side filter circuit 11 and the auxiliary power supply circuit 14 will not be immersed in water until the water level of the water that has entered the circuit component housing space 21 exceeds the height of the side plate 26b.

  Thus, in the stationary power converter 1 according to the present embodiment, it can be said that the waterproof box 26 protects the electric circuit components from water intrusion to some extent. Further, since the waterproof box 26 of the stationary power converter 1 according to the present embodiment merely contains the components related to the input-side filter circuit 11 and the auxiliary power supply circuit 14, the waterproof box 26 is a well-known countermeasure against inundation. As compared with the case where resin sealing (resin potting) of the circuit component is performed, it is possible to achieve a reduction in weight and an improvement in maintainability at the time of failure.

  The waterproof box 26 is grounded via the terminal block 10, as shown in FIG. For this reason, the waterproof box 26 also serves as a shield that protects the input-side filter circuit 11 and the auxiliary power supply circuit 14 from noise generated by a plurality of switching elements included in the power conversion circuit 12. In addition, since the metal waterproof box 26 is grounded, a short circuit between the circuit such as the input side filter circuit 11 and the GND due to the water that has entered the waterproof box 26, that is, a leakage from the waterproof box 26 occurs. It is possible to easily realize an earth leakage detection function of detecting the presence of the power supply and stopping the device safely.

  Although the embodiments of the stationary power conversion device according to the present invention have been described above, the present invention is not limited to this. The present invention has, for example, the following modifications.

  (1) The stationary power conversion device according to the present invention may include an intake port formed at an upper portion of the housing and an exhaust port formed at a lower portion of the housing. However, since the warmed air tends to rise, it is preferable to form the exhaust port at the upper part of the housing and the intake port at the lower part as in the embodiment in view of the efficiency of air cooling.

  (2) The stationary power converter according to the present invention may have an intake port and an exhaust port formed on the right side or the left side of the housing. When such a configuration is adopted, it is necessary to divide the space inside the housing into right and left parts instead of the front and rear parts by the partition wall.

  (3) The stationary power conversion device according to the present invention is not limited to the stationary charging device for charging the vehicle-mounted battery of the electric vehicle. If the application changes, the electric circuit for performing the power conversion shown in FIG. 3 naturally changes.

  (4) The waterproof box may contain components related to another electric circuit (for example, an output filter circuit) that generates a relatively small amount of heat, instead of components that constitute the input-side filter circuit and the auxiliary power supply circuit.

  (5) The bottom plate of the waterproof box may have a shape other than a rectangular shape. For example, when the bottom plate of the waterproof box is circular, the waterproof box has a columnar shape.

  (6) If the shield function and the leakage detection function are unnecessary, the waterproof box 26 may be made of resin.

  (7) The main part of the waterproof box may be one in which five metal plates are assembled without gaps by welding or the like, or a plurality of parts formed by bending one or three or more metal plates without gaps. It may be assembled.

REFERENCE SIGNS LIST 1 installation type power conversion device 2 housing 2 a front panel 2 b back panel 3 legs 4 operation panel 5 charging cable 6 charging connector 7 terminal block cover 8 intake port 9 exhaust port 10 terminal block 11 input side filter circuit 12 power conversion circuit 13 Output side filter circuit 14 Auxiliary power supply circuit 15 Control circuit 20 Partition wall 21 Circuit component accommodation space 22 Duct space 23 Fan 24 Board 24a Component mounting surface 24b Heat dissipation surface 25 Heat sink 26 Waterproof box 26a Bottom plates 26b, 26c, 26d, 26e Side plate 27 Substrate Mounting plate 27a First component mounting surface 27b Second component mounting surface 28 First top plate 29 Second top plate

Claims (4)

A box-shaped housing installed on the installation surface,
A space in the housing, a circuit component accommodating space for accommodating an electric circuit component, and a partition part that divides the duct space extending in a vertical direction,
A first vent formed in the housing, which communicates a lower portion of the duct space to the outside;
A second vent formed in the housing, which communicates an upper portion of the duct space to the outside,
A waterproof box arranged at the lower part of the circuit component housing space,
With
The waterproof box includes a bottom plate and side plates erected on all edges of the bottom plate,
A part of the electric circuit component is housed in the waterproof box. A substrate having a component mounting surface and a heat dissipation surface,
A heat sink protruding from the heat dissipation surface of the substrate,
Further comprising
A part of the electric circuit components other than the electric circuit components housed in the waterproof box is mounted on the component mounting surface,
The substrate is disposed in the circuit component housing space so as to close an opening formed in the partition,
The installation type power converter according to claim 1, wherein the heat sink protrudes into the duct space through the opening. A fan disposed in the second vent;
Further comprising
3. The stationary power converter according to claim 2, wherein when the fan rotates, air taken into the duct space from the first ventilation port rises while passing between the heat sinks. 4. The electric circuit component includes a first component related to an input-side filter circuit that shapes AC power or DC power input from the outside, and a power conversion circuit that converts AC power or DC power after shaping into desired DC power. Two components, and a third component relating to an output-side filter circuit for shaping the desired DC power and outputting it to the outside,
The first component or the third component is housed in the waterproof box,
The stationary power converter according to claim 2 or 3, wherein the second component is mounted on the component mounting surface of the substrate.

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