JP2017184417A - Power converter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize space saving without eroding the interior space, especially in an indoor installation power converter.SOLUTION: In a power converter including a power conversion circuit for converting DC power into AC power, and a heat sink for radiating heat generated from the power conversion circuit, the heat sink has a base where a heating component of the power conversion circuit is placed on a predetermined surface in heat conduction state, and a radiation fin elongating from the back side of the predetermined surface, and is configured to be attachable to the wall so that the power conversion circuit is the back side and the radiation fin is the front side, and at least a part of the power conversion circuit is located in the wall of a building.SELECTED DRAWING: Figure 5

Description

The present invention relates to a power conversion device that converts DC power obtained from an external DC power source such as a solar cell into AC power.

A power conversion device (referred to as a power conditioner) for a photovoltaic power generation system boosts a DC power generated by a solar cell as a power conversion circuit in a casing with a booster circuit as a power conversion circuit. Is converted into predetermined AC power synchronized with the inverter circuit by an inverter circuit, and the converted AC power can be superimposed on the commercial power system. This power conversion circuit is equipped with heat-generating components such as semiconductor switching elements and reactors, and the heat generated by these heat sources is attached to the heat sink substrate in a heat-conducting state and is dissipated from the heat sink fins of the heat sink. Yes (Patent Document 1).

JP 2012-164878 A

Such a power conversion device is arranged on the wall of a building. However, there is a demand for space saving so as not to disturb the living space. It is relatively large and contains heat generating parts such as various circuits and reactors, and it is necessary to provide a certain amount of heat sink to deal with the heat generation. It was often.

In view of the above problems, the present invention may be made, and in a power conversion device including a power conversion circuit that converts DC power into AC power and a heat sink that dissipates heat generated by the power conversion circuit, the heat sink includes: A heat generating component of the power conversion circuit has a base portion disposed on a predetermined surface in a heat conducting state, and a heat radiation fin extending from the back surface of the predetermined surface, the power conversion circuit on the back side and the heat radiation fin on the front side It is comprised so that attachment to the wall of a building is possible.

The power conversion device of the present invention is configured such that the power conversion circuit composed of various circuits and components is on the back side and the radiating fin is on the front side, and at least a part of the power conversion circuit is formed on the wall of the building. Since it is configured to be attachable to the wall so as to be positioned inside, a portion projecting to the front surface side is reduced, space can be saved, and a heat dissipation function by a heat sink can be secured.

It is explanatory drawing which shows an example of arrangement | positioning of power converter circuits, such as various circuits and components inside the power converter device which concerns on this invention. It is explanatory drawing of the top view which shows an example of the state which installed the power converter circuit in the heat sink in the power converter device which concerns on this invention. It is a circuit block diagram of the power converter device which concerns on this invention. It is a perspective view which shows the mode of attachment of the power converter device which concerns on this invention. It is side surface sectional drawing of the state which installed the power converter device which concerns on this invention.

The present embodiment includes a power conversion circuit that converts DC power obtained from an external DC power source such as a solar cell into AC power, and includes a heat sink that dissipates heat generated by the power conversion circuit. The heat sink side is located outside the wall of a building such as a house, and at least a part of the power conversion circuit is located inside the wall of the building. The embodiment will be described below with reference to the drawings.

As shown in FIG.1 and FIG.2, the power converter device 1 which concerns on this embodiment comprises the power converter circuit INV which converts the direct-current power obtained from external DC power supplies, such as the solar cell PV, into alternating current power. The electric circuit component 6 is accommodated inside.

A power conversion circuit INV is accommodated in the main body 3. As shown in FIG. 2, a chassis 5 for attaching a plurality of electric circuit components 6 constituting the power conversion circuit INV is provided with a column member 12.
Is attached to the base portion 8A of the heat sink 8 in a heat conducting state.

FIG. 3 shows the configuration of the power conversion circuit INV. The power conversion circuit INV is a solar cell P
DC power generated by V is converted into a DC reactor L1, a switching element S1, and a diode D.
1. The voltage is boosted to a predetermined voltage by a booster circuit BS including a smoothing capacitor C1, and the power boosted by the booster circuit BS is synchronized with the frequency of the commercial power grid GRID by a DC / AC converter circuit DA composed of a plurality of switching elements S2. Is converted into a sine wave alternating current and output to the commercial power system GRID via the relay contact RY in a state where the high frequency component is cut or sufficiently attenuated by the low pass filter LPF including the AC reactor L2 and the capacitor C2. . Booster circuit BS
The operation of the DC / AC conversion circuit DA and the relay contact RY is controlled by the control circuit CP.

Among the electric components constituting the power conversion circuit INV, main electric circuit components 6 other than large components such as a DC reactor L1, an AC reactor L2, a capacitor C1, and a capacitor C2.
Are arranged on a printed wiring board having a large plane area, and the DC reactor L1, the AC reactor L2, the capacitor C1, the capacitor C2, and the like are also electrically connected to the wiring pattern formed on the main board 7.

The power conversion circuit INV includes an input-side current sensor CT1 that detects an input current from the solar battery PV to the power conversion circuit INV, and includes an output-side current sensor CT2 that detects an output current of the power conversion circuit INV. The input-side current sensor CT1 and the output-side current sensor CT2 are hall element type current sensors that can be used for detection of both DC current and AC current for common use, and are sub-boards 71 attached to the main board 7. , 72 respectively.

The terminal block 11 includes a connection terminal between the power conversion circuit INV and the solar battery PV, a connection terminal between the power conversion circuit INV and the commercial power grid GRID, a ground terminal, and a self-standing terminal. A connection line 13 to the circuit INV is provided.

When the commercial power system GRID becomes inoperable due to a disaster or the like, the self-supporting terminal can be used to connect the appliances in the house with the AC power converted by the power conversion circuit INV from the DC power generated by the solar battery PV. For emergency outlet connection to operate.

In the housing 2, wiring with the solar battery PV, the commercial power grid GRID, and the emergency outlet is connected to the terminal block 11, and thus a wiring opening 12 is formed corresponding to the terminal block 11. Capacitor C1 and capacitor C2 may each have a single configuration or a configuration configured by a group of a plurality of small capacitors.

Since the switching elements S1 and S2 generate heat and become high temperature in the power conversion circuit INV, in order to dissipate the generated heat, they are modularized in a form accommodated in one or separate packages. This is called an IPM (intelligent power module).

The IPM is attached to a heat sink 8 having good heat conductivity such as aluminum. As shown in FIG. 2, the heat sink 8 includes a base portion 8 </ b> A and a plurality of heat radiation fins 8 </ b> B produced so as to be substantially perpendicular to the base portion 8 </ b> A and positioned substantially parallel to each other.

The lid 4 is provided so as to cover at least the heat radiation fin 8B. The lid body 4 is provided with air holes 4A through which air flows in and out from the outside in order to promote heat dissipation from the heat sink 8 (FIG. 4). By the cover 4 covering the radiation fins 8B (heat generation portions), user access to the radiation fins 8B (heat generation portions) can be suppressed.

Then, the attachment of the power converter device which concerns on this invention is demonstrated based on FIG. 4 and FIG. As shown in FIG. 2, in the base portion 8A of the heat sink 8, on one side surface (predetermined surface), a power conversion circuit INV such as an electric circuit component 6 and an IPM (heat generating component) are installed.
A plurality of heat radiation fins 8B are formed (extended) on the other side surface (the back surface of the predetermined surface). The power conversion circuit INV side is positioned so as to be accommodated in the housing 2, and the heat radiating fins 8 </ b> B are positioned so as to be accommodated in the lid body 4.

As shown in FIG. 4, the lid body 4 includes air holes 4 </ b> A formed in a slit shape for allowing air to flow between the heat radiating fins 8 </ b> B to dissipate heat. The air holes 4A are appropriately provided on the flat surface side, bottom surface side, and left and right side surfaces of the lid body 4. In the following description, the heat sink 8 side is described as the front side, and the power conversion circuit INV side is described as the back side.

The lid 4 operates the power conversion apparatus 1 according to the present invention, and an operation display unit 2 for confirming the state.
2 is provided. Here, it is desirable to provide the operation display unit 22 at a position (downward) lower than the height of the heat sink 8. Ascending airflow is generated in the lid 4 due to the heat generated by the heat sink 8, the operation display unit 22 can be made less affected by the heat by positioning the operation display unit 22 at a position lower than the heat sink 8. Deterioration due to heat of the wiring 22 and the wiring connected thereto can be prevented.

The housing 2 is provided with a heat radiating hole 2A for radiating heat generated by the power conversion circuit INV inside the housing 2 and particularly the IPM. As will be described later, the housing 2 on the back side is installed so as to be housed inside the wall of a building such as a house, so that malfunction or malfunction caused by insects or small animals entering the housing 2 In order to prevent this, the heat radiation hole 2A is preferably provided with an intrusion prevention unit such as a mesh member or a filter member.

A duct 9 is provided above the heat dissipation hole 2 </ b> A on the upper wall of the housing 2. Heat dissipation hole 2 in the duct
When the electric circuit component 6 discharged from A is radiated, warmed air is guided. The air that has entered the duct is guided along the duct to a wall opening provided above the power converter on the wall where the power converter is disposed, and heat dissipation of the power converter is promoted.

As shown in FIG. 5, the back side of the power converter 1 is an opening 30 formed in the wall member of the building.
It is installed to be inserted into A. The installation unit 30 has an opening 30 for inserting and housing the housing 2.
A and mounting means 30B provided with screw holes and the like for attaching and fixing the base portion 8A of the heat sink 8 to the wall of the building by screws or the like. Thus, the power conversion device is attached to the wall of the building so that the power conversion circuit is on the back side and the heat radiation fin is on the front side.

The attachment means 30B may be provided as a separate member, and when a pillar such as a house inside the wall can be used, the pillar may be used as the attachment means 30B. Although not particularly illustrated in the present description, the base portion 8A of the heat sink 8 can become a high temperature due to heat generated by the internal equipment.
In the attachment to the attachment means 30B, it is desirable to attach via the member which has heat insulation.

As shown in FIG. 5, the installed power conversion device 1 is installed such that the lid 4 side, that is, the front side is exposed to the outside of the wall and the back side is accommodated inside the wall. In this way, since the portion protruding to the indoor side corresponding to the outside of the wall is only the front side portion related to the lid body 4, compared with the conventional indoor installation type power conversion device, it does not disturb the indoor user, Space can be saved.

In order to obtain a cooling function by sufficient heat radiation, at least the heat radiation fin 8B of the heat sink 8
As shown in FIG. 4 and FIG. 5, it is desirable not to be located inside the wall but to be located outside the wall. Further, it is desirable that the heat sink 8 (the base portion 8A thereof) covers the entire space 30A. In this way, the power conversion circuit is located inside the wall, and the opening can be closed by the base portion 8A to form a sealed structure. For example, it can be placed in a humid room such as near a bathroom. become.

In the description so far and FIG. 5, the casing 2 corresponding to the back side of the power conversion device 1 according to the present invention is configured to be completely accommodated inside the wall. There is no need to position it. What is necessary is just to set suitably in consideration of the thickness of the wall member of the building to install, the width of the space inside a wall, etc. Note that the fin 8B of the heat sink 8 is as long as heat dissipation permits.
It is not a problem that is located inside the wall.

In the above description, the wall may be any member provided to prevent wind and rain from entering the building, and is composed of a plurality of plate-like or columnar members and has a space inside. It may be, or it may be one that is buried in concrete or the like and is in the form of a single plate.

The inside of the wall may be a certain space having an opening provided in a part of the wall as described above, and the outside of the wall is outside the certain space defined as the inside of the wall. Good.

Although the operation display part 22 is provided in the front cover 20, it is not restricted to this. The front cover 20 may be provided only to cover the heat radiation fins 8 </ b> B of the heat sink 8, and the operation display unit 22 may be provided outside the front cover 20 separately.

Although a solar cell is taken up as the external DC power supply, a fuel cell, a wind power generator, a wave power generator, and the like can be applied to the present invention.

DESCRIPTION OF SYMBOLS 1 ... Power converter device 2 ... Housing 2A ... Radiation hole 4 ... Lid 4A ... Air hole 6 ... Electric circuit component 8 ...・ ・ ・ ・ Heat sink 9 ・ ・ ・ Duct INV ・ ・ ・ Power conversion circuit PV ・ ・ ・ ・ ・ ・ Solar cell

Claims (5)

A power conversion circuit for converting DC power into AC power;
In a power converter comprising a heat sink that dissipates heat generated by the power converter circuit,
The heat sink includes a base portion on which a heat generating component of the power conversion circuit is disposed on a predetermined surface in a heat conducting state, and a heat radiation fin extending from the back surface of the predetermined surface,
The power conversion circuit is configured to be attachable to the wall so that the heat radiating fin is on the front side and at least a part of the power conversion circuit is located inside the wall of the building. A power conversion device. The power converter according to claim 1, wherein the heat sink is positioned outside the wall. An operation unit for operating the power conversion device or a display unit for displaying a state is provided.
The power converter according to claim 1, wherein the operation unit or the display unit is positioned lower than a height of the heat sink. A housing for accommodating the power conversion circuit;
The heat dissipation hole provided with the intrusion prevention part which radiates the heat | fever which the said power conversion circuit emits in the said housing | casing, and prevents the penetration | invasion of the foreign material to an inside is provided. 4. The power conversion device according to 3. The power converter according to any one of claims 1 to 4, further comprising a lid that covers the heat radiation fin.

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