JP6268361B2 - Inverter device - Google Patents

Description

  The present invention relates to an inverter device.

2. Description of the Related Art Conventionally, there has been provided an inverter device that inputs DC power from a solar cell, a storage battery, a fuel cell, or the like via a terminal (from the outside) and converts it into AC power. This inverter device supplies the converted AC power to an external load via a terminal. When such a power conversion unit of the inverter device operates, the switch element and the reactor of the power conversion unit mainly generate heat and generate heat.

When the inverter device has a hermetically sealed structure, in order to cool the heat generated by this heat generation, air is circulated by an internal fan so that the heat is released to the outside through the housing and cooled ( Patent Document 1).

On the other hand, in the inverter device, a power conversion unit through which a large current flows and a terminal that requires work (wiring, etc.) at the time of installation are separated by a partition plate (Patent Document 2), and contacts the power conversion unit at the time of work. Safety is secured to make it difficult.

JP 2008-259282 A JP 2013-138777 A

However, if the power conversion unit and the terminal are partitioned by a partition plate or the like in the sealed casing, the partition in which the power conversion unit is disposed becomes small, and a sufficient cooling effect is obtained even if the air in this partition is circulated by a cooling fan. There was a problem that I could not.

This invention is made | formed in view of such a problem, and it aims at providing the inverter apparatus which can improve a cooling effect, even if the division where a power conversion part is arrange | positioned becomes small.

The inverter device of the present invention, the DC power output from the DC power supply is input, the power conversion unit that converts the input DC power into AC power and outputs, the housing that houses and seals the power conversion unit, In the inverter device provided with the first section, the housing is provided with a first section in which the power conversion unit is disposed, and a second section with the first section and a wall interposed therebetween, and the wall includes a second section from the first section to the second section. A first air passage and a second air passage leading to the compartment are provided, and a blower for blowing air from one compartment of the first compartment and the second compartment to the other compartment is disposed in the first air passage. The air blown from the blower returns to the one compartment from the other compartment through the second air passage.

According to the present invention, the cooling effect can be enhanced even if the section in which the power conversion unit is disposed becomes smaller.

It is a figure which shows the connection of an inverter apparatus. It is a perspective view of an inverter apparatus. It is a figure which shows an air path.

In this embodiment, a wall that partitions the power conversion unit and the terminal is provided in the sealed casing, a plurality of air paths are formed on the wall, and a blower is provided in one of the air paths so that the air in both sections is By circulating, the cooling effect of the casing of the inverter device can be enhanced while safely arranging.

As shown in FIG. 1, the inverter device 1 includes a power converter CNV, a control circuit 7, a switch S1.
To S5 and the terminal block 16. The power converter CNV includes a plurality of booster circuits 4a to 4
e (here, five), an inverter circuit 5, and a filter circuit 6.

The plurality of booster circuits 4a to 4e are connected to the solar cells 2a to 2e via the switches S1 to S5, respectively. The booster circuits 4 a to 4 e boost the voltage of the DC power input from the solar cells 2 a to 2 e and supply the boosted DC power to the inverter circuit 5.

The step-up circuits 4a to 4e have a DC reactor DCL through which DC power output from the solar cell flows,
It is constituted by a non-insulated chopper circuit composed of a switch element, a diode, and a capacitor.

The inverter circuit 5 converts the DC power supplied from the booster circuits 4a to 4e into AC power. The inverter circuit 5 is composed of a circuit in which a plurality of switch elements are connected by a full bridge. A filter circuit 6 that attenuates the high-frequency component of the AC power is connected to the output side of the inverter circuit 5. The configuration of the inverter circuit 5 is not limited to the bridge connection, and a neutral point clamp method or the like can be used.

The filter circuit 6 is an AC reactor ACL through which AC power output from the inverter circuit 5 flows.
Is provided. The AC power that has passed through the filter circuit 6 is superimposed on the commercial power system 3 via, for example, an interconnection relay and terminal block 16. Note that the control circuit 7 controls the operations of the booster circuits 4 a to 4 e and the inverter circuit 5 described above.

In this way, the inverter device 1 converts the DC power output from the solar cell into AC power and superimposes the converted AC power on the commercial power system. Thereby, the inverter apparatus 1 can supply alternating current power to the load connected to the commercial power system. When the inverter device 1 operates, the electronic components (the above-described switch element, diode, DC reactor DCL, AC reactor A described above) constituting the booster circuits 4a to 4e, the inverter circuit 5, and the filter circuit 6 are used.
CL, capacitor, etc.) generate heat, leading to a temperature rise of the inverter device 1.

As shown in FIG. 2, the electronic components constituting these inverter devices 1 are accommodated in a housing 10. The casing 10 has a substantially rectangular parallelepiped shape, and the upper side panel 11, the lower side panel 12, the left side panel 13, the right side panel 14, and the bottom 15 constituting the outer shape are integrally formed by die-casting aluminum alloy or the like. Molded. The inverter device 1 is used by sealing the front opening of the housing 10 with a front panel and attaching the outside of the bottom 15 to a building wall or the like so that the lower side panel 12 of the housing 10 is on the ground side (lower side). .

Moreover, the inside of the housing 10 includes a first section A in which the power conversion unit CNV is disposed, and a power conversion unit C.
It is divided into a terminal for relaying an input to the NV or an output from the power conversion unit CNV and a second section B in which the output terminal is arranged, and these are divided between the first section A and the second section B. A wall 20 that partitions these sections is formed.

In the first section A, electronic components constituting the power conversion unit CNV are arranged. Booster circuit 4a ~
The switch elements and diodes constituting 4e are collected as a module SWM and directly attached to the housing 10. Here, the switch elements and the diodes of the five booster circuits 4a to 4e are combined into three modules SWM.

The plurality of switch elements constituting the inverter circuit 5 are the switch module IPM.
And are attached directly to the housing 10. The direct current reactor DCL and the alternating current reactor ACL are respectively disposed in the depressions 41 provided in the first section A, and heat exchange with the housing 10 is promoted by enclosing a resin member having high thermal conductivity in the depressions 41. So that it is fixed.

The other electronic components constituting the power conversion unit CNV are mounted on the plurality of substrates 17 to be the first.
Arranged in section A. These electronic components are fixed to the bottom of the housing 10 by screws or the like.

Fins F are provided on the outer side of the bottom portion 15 of the housing 10, and the heat generated by the electronic components fixed to the bottom portion 15 of the housing 10 is easily radiated to the outside.

Moreover, an opening is provided on the right side panel 14 side of the lower side panel 12 of the housing 10, and a lid 51 seals and covers the opening of the child. The lid 51 is provided with a hole so that wiring to the inside of the housing 10 is routed. This hole is sealed with the wiring routed around.

The wall 20 includes a first wall portion 21, a second wall portion 22, and a third wall portion 23. The first wall portion 21 and the second wall portion 22 extend from the right side panel 14 to the lower side panel 1 so as to surround the lower right side of the housing 10.
It is integrally formed up to 2. Specifically, the first wall portion 21 is formed so as to extend horizontally from the right side panel 14 to the lower side panel 12, and the second wall portion 22 is formed so as to extend horizontally from the lower side panel 12 to the right side panel 14. The 1st wall part 21 and the 2nd wall part 22 are united and united in the extended tip. The third wall portion 23 is shaped to extend from the second wall portion 22 to the left side panel 13 in the horizontal direction.

Thereby, the first section A where the main heat generating components are arranged is provided on the upper side panel 11 side,
A second section with few heat generating components is provided on the lower surface panel 12 side.

The first wall 21 extends from the bottom 15 to the same height as the right side panel 14 and the lower side panel 12. An air passage 18 a is formed in the first wall portion 21. Fig.3 (a) is the figure which showed the air path from the front panel side. FIG. 3B is a view showing the air passage from the XX cross section.

As shown in FIG. 3B, the air passage 18a is formed in the first wall portion 21 so that the central portion is cut out in a stepped manner from the front panel side. And the terminal block 16 is arrange | positioned at the upper stage located in the front panel side of this air path 18a, and the air blower 31 is arrange | positioned at the lower stage, and it blows from the 2nd division to the 1st division with this air blower 31.

As shown in FIG. 3A, the terminal T1 connected to the power converter CNV of the terminal block 16 is the first.
A terminal T2 connected to the outside of the terminal block (commercial power system 3) is arranged on the second compartment side on the compartment A side.

The third wall portion 23 is formed so that the height from the bottom portion 15 is a plurality of steps (here, five steps), and the steps become higher as it goes from the second wall portion 22 to the left side panel 13 side. Yes. The third wall portion 23 is shaped to be lower than the left side panel 13. Thereby, as shown in FIG.3 (b), the air path 18c is formed above the 3rd wall part 23 (front panel side).

Moreover, as shown to Fig.3 (a), switch S1-S5 is arrange | positioned at each step | level of the 3rd wall part 23. FIG. At this time, the terminal T3 connected to the power converter CNV of the switches S1 to S5 is on the first section A side, and the terminal T4 connected to the outside of the switches S1 to S5 (solar cells 2a to 2e) is the first. 2
It is arranged on the section B side.

The wiring connecting the switches S1 to S5 and the solar cells 2a to 2e is the lid 5 through the air passage 18b.
1 hole (outside).

The blower 31 is a centrifugal blower (such as a sirocco fan).
The air in the second section B is sucked from the space provided between the casing 10 and the bottom portion 15 of the housing 10 so that the first section A
Discharge to (air blow). When the blown air is sent to the first section A, as shown by an arrow P in FIG. 2, the air passes through the air path 18c and the air path 18b in order and returns from the first section A to the second section B. That is, air circulates between the second section B and the first section A through the plurality of air passages 18a to 18c by the blowing of the blower 31.

As a result, the heat generated in the first section A is not only radiated to the outside via the housing 10 of the first section A, but is also sent to the second section by air circulation to form the second section B. Enclosure 10
(For example, the heat is radiated to the outside via the lower side panel 12, the left side panel 13, the right side panel 14, and the bottom 15 of the second section B).

Further, the air sent from the first section to the second section is cooled by this heat dissipation, and the cooled air is sent again to the first section by the blower 31. And this 1st division will also be cooled by this cooling air. In addition, since the 2nd division B has few arrangement | positioning of a thermal radiation component, more heat generated in the 1st area can be thermally radiated outside.

Thus, since the inverter apparatus of Example 1 dissipates heat from the whole housing 10 using not only the first compartment but also the second compartment, the compartment in which the power conversion unit CNV is arranged in the sealed housing 10. Even if it is small, the cooling effect can be enhanced.

In addition, since the power conversion unit CNV and the terminal are arranged in separate sections with a wall therebetween, the work can be safely performed during work such as installation.

Moreover, since all the components through which a large current flows, such as the booster circuits 4a to 4e, the inverter circuit 5, and the filter circuit 6 included in the power conversion unit CNV, are arranged in the first section, the safety is further improved.

Further, since air is blown from the second section B to the first section A using the blower 31, the air that has been heat-exchanged and cooled by the second section B directly hits the power conversion unit CNV of the first section A. . For this reason, the heat dissipation effect can be enhanced.

Further, since air is sucked from the space provided between the blower 31 and the bottom portion 15 of the casing 10 using the centrifugal blower and is blown to the first section A, the blower 31 and the bottom portion 15 of the casing 10 are The flow rate of air in the vicinity of the housing 10 increases, heat exchange is promoted, and the heat dissipation effect can be enhanced.

Moreover, the power converter CNV inputs the DC power supply of the plurality of solar cells 2a to 2e, and collectively converts the input DC power into AC power, and the blower 31 is a side (terminal) on which this AC power is output. The air is blown toward the side (switches S1 to S6) where DC power is input from the base 16). As a result, the AC power side where power is collected and heat generation is concentrated can be cooled intensively. Thereby, the heat dissipation effect can be enhanced.

As mentioned above, although one Embodiment of this invention was described, the above description is for making an understanding of this invention easy, and does not limit this invention. It goes without saying that the present invention can be changed and improved without departing from the gist thereof, and that the present invention includes equivalents thereof.

For example, although a centrifugal blower is used as the blower, various blowers such as an axial blower can be used.

For example, you may make it provide a fin in the inner wall of the housing 10 which comprises the 2nd division B. FIG. By doing in this way, the heat exchange by a 2nd division is accelerated | stimulated and the heat dissipation effect can be improved more.

For example, although the air was blown from the second section B to the first section A using the blower 31, the air may be blown from the first section A to the second section B using the blower.

The inverter device 1 of this embodiment can also be used as a DC power supply system including a DC power supply such as solar cells 2a to 2e.

DESCRIPTION OF SYMBOLS 1 Inverter apparatus 2a-2e Solar cell 3 Commercial power system 4a-4e Booster circuit 5 Inverter circuit 6 Filter circuit 7 Control circuit 10 Housing | casing 11 Upper side panel 12 Lower side panel 13 Left side panel 14 Right side panel 15 Bottom part 16 Terminal block 17 Substrate 18a-18c Air path S1-S5 Switch 20 Wall 21 1st wall 22 2nd wall 23 3rd wall 31 Blower 41 Recess 51 Lid ACL AC reactor CNV Power converter DCL DC reactor F Fin IPM Switch module SWM Module T1-T4 terminal

Claims (6)

A power conversion unit that inputs DC power output from a DC power source, converts the input DC power into AC power, and outputs, and
In an inverter device comprising a housing that houses and seals the power conversion unit,
A first compartment in the housing to the power conversion unit is disposed, the wiring connection of which is connected to an external
A second section including a connecting portion to be sandwiched between the first section and the wall;
The wall is provided with a first air passage and a second air passage leading from the first compartment to the second compartment,
In the first air passage, a blower that blows air from one of the first compartment and the second compartment to the other compartment is arranged,
The air blown from the blower returns to the one section from the other section through the second air path, and the inverter device. The power converter unit boosts the voltage of the DC power, an inverter circuit that converts the DC power boosted by the boost circuit into AC power, and attenuates a high frequency component from the AC power output from the inverter circuit A filter circuit,
The inverter device according to claim 1, wherein the booster circuit, the inverter circuit, and the filter circuit are arranged in a first section. The power conversion unit inputs DC power of the plurality of DC power supplies, collectively converts the input DC power into AC power,
The inverter apparatus according to claim 1, wherein the blower blows the air from a side where the AC power is output toward a side where the DC power is input. 4. The inverter device according to claim 1, wherein the one section is a second section, and the other section is a first section. 5. 4. The inverter device according to claim 1, wherein the one section is a first section, and the other section is a second section. 5. The fin is provided in the inner wall of the said housing | casing which comprises a 2nd division.
The inverter apparatus in any one of Claim 5 thru | or 5.

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