JPH09320768A - Dimming board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dimming board capably of equalizing cooling efficiency of a plurality of heating parts provided. SOLUTION: A dimming unit 2 is stored in the two arrays, one in front and one behind in a board box 1. Each dimming unit 2 provided with a coil 6 and a switching element 7 as heating parts. Of a casing 8 of the dimming unit 2, both side faces of a part storing the heating parts are opened, and ventilation paths 15a and 15b are formed. The ventilation paths 15a and 15b of the dimming unit 2 of each forward and rearward array communicates with reach other, and the adjacent dimming units 2 forwardly and rearwardly are thermally coupled with each other. The board box 1 is provided with two cooling fans 5a and 5b for ventilating the dimming units 2 in the forward and rearward arrays, and air flows in the opposite direction each other made in the dimming units 2 in the forward and rearward arrays, Thus, the orientation of a temperature gradient is mutually, temperature unevenness is offset, and the temperature of each heating part is substantially equal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light control panel in which a plurality of light control units for controlling power supplied to a lighting load are housed in a panel box.

[0002]

2. Description of the Related Art Conventionally, in a lighting system, such as stage lighting, which requires dimming of a large number of lighting loads, a dimming panel having a plurality of dimming units for dimming the lighting loads in a panel box is used. ing. As shown in FIG. 3, a light control panel of this type has a light control unit 2 arranged vertically and horizontally in a panel box 1 and an air inlet 3 provided on a side surface of the panel box 1 to a top surface of the panel box 1. It is known that the cooling fan 5 is arranged inside the board box 1 so as to form a flow of air to the provided air discharge port 4 (Actual No. Sho 57-119).
498). Light control unit 2 described in this publication
As shown in FIG. 4, a coil 6 which is a heat generating component is attached to a vertically arranged flat plate member 11, and a switching element 7 which is a heat generating component is thermally coupled to a heat radiation fin 12 which is vertically arranged. Therefore, air can be passed vertically through the light control unit 2, and the light control unit 2 is provided in the light control unit 2 by arranging the light control unit 2 in the air passage formed in the vertical direction. The heat-generating components such as the coil 6 and the switching element 7 can be air-cooled.

[0003]

By the way, in the light control board described in the above publication, a plurality of light control units 2 are arranged along the air flow path, so that the upstream side of the air flow (see FIG. The air heated by the dimming unit 2 arranged on the lower side of FIG. 3 is located on the downstream side (the upper side of FIG. 3).
Since the temperature of the air used for cooling is different between the upstream side and the downstream side, the cooling efficiency is different. That is, the coil 6 and the switching element 7
Since a plurality of such heat generating components are arranged along the air flow path, if the flow rate of air is set so that the heat generating components on the upstream side are appropriately cooled, the heat generating components on the downstream side will be Cooling becomes insufficient, and conversely, if the flow rate of air is set so that the heat generating components on the downstream side are appropriately cooled, the heat generating components on the upstream side will be cooled more than necessary. In the former case, the temperature of the heat-generating components on the downstream side exceeds the standard value and becomes overheated. In the latter case, it is necessary to use a cooling fan with a large flow rate, so the cooling fan becomes large or the cooling fan There is a problem that the power consumption of the device increases.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a light control panel capable of equalizing the cooling efficiency of a plurality of heat-generating components.

[0005]

According to a first aspect of the present invention, there is provided a dimming unit in which a dimming control section for controlling power supplied to a lighting load is housed in a casing, in a panel box provided with a cooling fan. In a dimming panel containing a plurality of dimming units, the dimming units are arranged in two rows, and a cooling fan for air-cooling the heat-generating components by forming an air flow in the arranging direction for each row is provided in the panel box to dimming each row The casings of the units are in close contact with each other, and the ventilation directions of the rows are set to be opposite to each other.

According to this configuration, since the ventilation directions of the light control units arranged in two rows are set to be opposite to each other, the temperature gradient of the air passing through each row has an opposite relationship. That is, since the temperature of the airflow formed by the cooling fan rises every time it passes through the light control units, the temperature of the air on the downstream side of the airflow is higher than the temperature of the air on the upstream side in each row of the light control units. Will also be higher. On the other hand, since the two rows of light control units are thermally coupled to each other by bringing the casings into close contact with each other, the temperatures of the light control units in each row that are in close contact with each other are averaged. As a result, the temperature gradients are inversely related in each row, and since the temperatures are averaged in the dimming units that are in close contact with each other in the rows, the temperatures are almost averaged in all the dimming units. Therefore, the temperature difference between the upstream side and the downstream side of the air flow can be reduced. As a result, the cooling efficiency of the heat-generating component can be made uniform, and the temperature of the heat-generating component can be reduced to the standard value without using a cooling fan having an excessively large capacity.

According to a second aspect of the invention, in the first aspect of the invention, the casing is made of a material having good heat conductivity. With this configuration, the degree of thermal coupling between the light control units in each row is increased, and the temperature difference between the light control units in each row can be further reduced.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION As shown in FIG.
A plurality of light control units 2 are arranged in the horizontal direction. As shown in FIG. 1B, each dimming unit 2 is provided with a breaker 13 and a dimming control section in one casing 8, and the inside of the casing 8 is divided into upper and lower three chambers. In the lower stage, a board 14 on which an electronic component that generates a small amount of heat among electronic components that constitute the breaker 13 and the dimming control unit is mounted is housed. A coil (choke coil) 6, which is a heat-generating component of the electronic components that form the dimming control unit, is housed in the middle stage, and a switching element as the heat-generating component of the electronic components that configure the dimming control unit is stored in the upper stage. (Triac) 7 is stored. Here, the dimming control unit is configured to control the phase of the power supplied to the lighting load by using a triac, but the dimming control unit uses an inverter that performs full-wave rectification on the AC power supply and then converts it to AC power. May be configured.

The parts for accommodating the coil 6 and the switching element 7 are separated from the other parts, and both side surfaces are open. That is, the coil 6 and the switching element 7 are housed in the air passages 15a and 15b formed between the both side surfaces, respectively. By arranging the light control units 2 configured as described above in close contact with each other in the lateral direction, the ventilation paths 15a and 15b of the light control units 2 in each row communicate with each other to form flow paths.

The above-mentioned light control units 2 are arranged in the front and rear two rows inside the board box 1. Further, the same number of front and rear light control units 2 are provided, and the front and rear light control units 2 in each row are brought into close contact with each other. Here, the casing 8 is preferably made of a material having a good thermal conductivity such as copper or aluminum. In other words, the front and rear light control units 2 are thermally coupled and sufficient heat conduction is obtained,
That is, the temperatures of the front and rear light control units 2 are averaged. In addition, in the light control unit 2 shown in FIG.
3 and the substrate 14 are shared by the front and rear light control units 2.

Air inlets 3a and 3b are formed on the front wall and the rear wall of the board box 1, and air discharge ports 4a and 4b are formed on the upper wall at two locations. The positions of the air outlets 4a and 4b are near both ends of the diagonal line of the upper wall of the board box 1, and the air taken in from the air inlets 3a and 3b is near the air outlets 4a and 4b. Four
Cooling fans 5a and 5b that form an air flow so as to be discharged from a and 4b are respectively arranged. Here, the air taken in from the air inlet 3a of the front wall is sent out from the air discharge port 4a on the front side (the left front part of FIG. 1A) through the light control unit 2 in the front row, and the air on the rear wall. The air taken in from the inflow port 3b passes through the light control unit 2 in the rear row and is sent out from the air discharge port 4b on the rear side (right rear part of FIG. 1A) so that the internal space of the board box 1 is It is divided by a partition plate 9 (the flow of air is indicated by an arrow in FIG. 1A).

According to this structure, as shown by the arrow in FIG. 2, the airflow flows from right to left with respect to the light control units 2 in the front row, and air flows from left to right with respect to the light control units 2 in the rear row. The flow will flow. That is, the air flow is opposite to the light control units 2 in the front and rear rows. As a result, in the front row, the temperature of the air stream tends to increase toward the left side, and in the rear row, the temperature of the air stream tends to increase toward the right side. In this way, the temperature gradients tend to be formed in opposite directions, whereas the front and rear dimming units 2 are thermally coupled so that the temperature gradients in the front and rear rows cancel each other out. Therefore, the temperatures of all the light control units 2 are substantially equalized, and the temperature of the air passing through the coil 6 and the switching element 7 can be made substantially the same in any of the light control units 2, and the respective light control units can be adjusted. The heat radiation conditions of the unit 2 can be made to substantially match. That is, the capacities of the cooling fans 5a and 5b can be set small enough to be necessary, and it is possible to avoid an increase in size and unnecessary power consumption, and moreover, to overheat heat-generating components such as the coil 6 and the switching element 7. It is possible to prevent the situation and cool down to the standard value.

[0013]

According to the first aspect of the present invention, a plurality of dimming units each having a dimming control unit for controlling the power supplied to the lighting load housed in the casing are housed in a board box provided with a cooling fan. In the light control panel, the light control units are arranged in two rows, and a cooling fan for air-cooling the heat-generating components by forming an air flow in the arrangement direction for each row is provided in the panel box, and a casing for the light control units in each row. Are in close contact with each other, and the ventilation directions of the respective rows are set to be opposite to each other. Since the ventilation directions of the dimming units arranged in two rows are set to the opposite directions, the rows are passed through. The temperature gradient of air has the opposite relationship. Further, since the two rows of the light control units are thermally coupled to each other by bringing the casings into close contact with each other, the temperatures of the light control units of the respective rows in close contact with each other are averaged. In other words, the temperature gradients are inversely related in each row, and the temperature is averaged in the dimming units that are in close contact with each other in each row. The temperature difference between the upstream side and the downstream side can be reduced, so that the cooling efficiency of the heat generating component can be made uniform, and the temperature of the heat generating component can be adjusted without using an excessively large cooling fan. Has the advantage that it can be reduced to the standard value.

When the casing is made of a material having good thermal conductivity as in the second aspect of the present invention, the degree of thermal coupling between the light control units in each row becomes high, and the light control units in each row have a high degree of thermal coupling. There is an advantage in that the temperature difference of can be further reduced.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, in which (a) is an overall perspective view and (b) is a perspective view of a light control unit.

FIG. 2 is a horizontal sectional view of the above.

FIG. 3 is a perspective view showing a conventional example.

FIG. 4 is a perspective view of a light control unit used in a conventional example.

[Explanation of symbols]

 1 panel box 2 light control unit 3 air inlet 3a air inlet 3b air inlet 4 air outlet 4a air outlet 4b air outlet 5 cooling fan 5a cooling fan 5b cooling fan 6 coil 7 switching element 8 casing 9 partition plate 15a air passage 15b air passage

Claims (2)

[Claims] 1. A dimming unit in which a plurality of dimming units having a dimming control unit for controlling power supplied to a lighting load housed in a casing are housed in a board box provided with a cooling fan. Are arranged in two rows, and a cooling fan for air-cooling the heat-generating components by forming an air flow in the arrangement direction in each row is provided in the panel box, and the casings of the light control units in each row are brought into close contact with each other, and A light control panel characterized by setting the ventilation directions to the opposite directions. 2. The light control board according to claim 1, wherein the casing is made of a material having good thermal conductivity.