JP2006120780A - Circuit board device and radio base station device using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make a circuit board device to be properly cooled arranged in a radio unit and the like of a radio base station. <P>SOLUTION: The circuit board device comprises a substrate wherein electronic components are mounted, and a shielding case provided with a division plate for dividing a circuit block from the exterior or the other blocks on the substrate device which is allocated on the substrate device so that it is formed almost into a shape of a case so as to cover the electronic components. Since the shielding case possesses a communicating path for interconnecting the circuit block and the exterior of the shielding case for free passage which is formed in the dividing plate, the temperature rise in the circuit block is suppressed by generating air floating between the circuit block inside and the case outside. Moreover, the interference wave to the circuit block is shielded by arranging a conductive partition member in the communicating path which enables air flow between the circuit block and the case exterior. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a circuit board device on which electronic components are mounted, and a radio base station apparatus used in a radio communication system such as an automobile phone or a mobile phone using the circuit board device.

  Conventionally, in a wireless communication system such as a car phone system or a mobile phone system, a radio base station is installed for each area of a predetermined area, and radio communication is performed with a car phone or a mobile phone in the area. Such a base station is provided with a wireless unit for performing wireless communication.

As shown in FIG. 6, in order to make it possible to use a large number of automobile telephones and mobile phones, a plurality of wireless units 3 are collectively stored in a dedicated rack 2 to serve as a base station as a wireless base station apparatus. Station 1 is installed. Each wireless unit 3 includes a substrate 5 on which a large number of electronic components (IC chips and the like) constituting a transmission / reception circuit, a signal amplification circuit, and the like are fixedly connected, and the substrate 5 so as to cover the electronic components on the substrate. A circuit board device having a shield case 7 to be installed is provided. Since some of the electronic components on the substrate 5 in this circuit board device handle high frequencies, the electronic components on the substrate 5 are affected by external interference waves, and the high frequencies radiated from the electronic components are high. In order to suppress the influence on other circuits, a shield case 7 is installed on the substrate 5. Note that electronic components are mounted on both surfaces (left and right surfaces in FIG. 6) of the substrate 5, and the shield case 7 is disposed on each of both surfaces of the substrate 5.
The shield case 7 has a substantially casing shape with an open bottom, is formed by conductive aluminum die casting, and a partition plate for partitioning each circuit block on the substrate 5 is projected. . The end face of the partition plate is conductively joined to an earth site such as an earth pattern provided on the substrate 5.

In addition, a large number of fins 16 are formed on the back surface of the shield case 7 in order to prevent the wireless unit 3 from rising in temperature as the electronic components generate heat. The fins 16 are provided to dissipate the heat absorbed by the shield case due to heat generated by the electronic components in the circuit block to the outside, and the temperature rise of the wireless unit 3 is suppressed by the heat dissipation from the fins 16.
Further, in this radio base station apparatus, fans 4 a and 4 b are provided at the upper and lower positions in the rack 2. The operation of the lower fan 4b causes the outside air to flow into the rack, and the operation of the upper fan 4a causes the air within the rack 2 to flow out. Therefore, an air flow from the lower side to the upper side is generated in the rack 2 by the operation of the fans 4a and 4b. The heat generated in the rack 2 moves upward and stays above the rack 2, but this heat is released to the outside of the rack 2 by the upward air flow generated by the operation of the fans 4a and 4b. Further, a ventilation hole 22 penetrating in the vertical direction is formed between the adjacent wireless units 3 in the shelf portion 21 where the wireless unit 3 is installed, and the air flow generated by the operation of the fans 4a and 4b is ventilated. It passes between adjacent wireless units through the hole 22. As described above, the air flow is generated between the adjacent wireless units, whereby the fins 16 formed on the back surface of the shield case 7 are air-cooled, and the heat radiation from the fins 16 is promoted, so that the wireless unit 3 is lifted. Temperature is suppressed. (For example, refer to Patent Document 1).
JP 2001-94281 A

However, in such a conventional radio base station apparatus, since the radio unit 3 is cooled only by the configuration that dissipates heat from the fins 16 on the back surface of the shield case 7, the cooling efficiency of the radio unit 3 is limited.
And in such a structure, when the emitted-heat amount of the electronic component on the circuit board 5 increases or the accommodation number of the radio | wireless units 3 increases, there exists a problem that a desired cooling effect cannot be acquired. .

  SUMMARY OF THE INVENTION An object of the present invention is to provide a circuit board device and a radio base station apparatus using the circuit board device, in which a failure of an electronic component or the like is prevented by increasing cooling efficiency and the durability thereof is improved.

In order to solve the above problems, a circuit board device of the present invention is provided on a circuit board on which an electronic component is mounted and a circuit board that is formed in a substantially casing shape so as to cover the electronic component. And a shield case on which a partition plate for partitioning the circuit block on the circuit board from the outside and other circuit blocks is formed, wherein the shield case is formed on the partition plate. And a communication path for communicating between the circuit block and the outside of the shield case.
Therefore, since the inside of the circuit block and the outside of the shield case communicate with each other by the communication path that connects the circuit block and the outside of the shield case, it is possible to generate air flow between the inside of the circuit block and the outside of the case. The inside of the circuit block can be cooled, and the temperature rise of the circuit board device can be suppressed.

Further, the conductive passage is provided with a conductive partition member that allows air flow between the circuit block and the outside of the shield case.
Therefore, since the conductive partition member is disposed in the communication path, air flow can be generated between the circuit block and the outside of the case while maintaining the shielding effect of the shielding case, and the cooling performance of the circuit board device can be improved. Can be improved.

In addition, the communication path is provided with a blower that allows air outside the case to flow into the shield case or allows air inside the shield case to flow out of the case.
Therefore, the air flow between the inside of the circuit block and the outside of the case can be forcibly generated by the blower provided in the communication path, the inside of the circuit block can be effectively cooled, and the circuit board device can be raised. The temperature can be further suppressed.

The radio base station apparatus according to the present invention is characterized in that the circuit board device is configured as a part of the radio base station and disposed in a rack.
Therefore, the circuit board device that constitutes a part of the radio base station and is disposed in the rack is suitably cooled, and the cooling performance of the radio base station device can be further improved.

In addition, a blower for generating an air flow around the circuit board device during operation is disposed in the rack.
Therefore, when the air blower in the rack is activated to generate an air flow around the circuit board device, the air flow between the circuit block and the outside of the case is promoted, and the cooling performance of the circuit board device and the radio base station device is increased. Can be further improved.

  According to the circuit board device of the present invention, an air flow can be generated in the circuit block by providing a communication path in the partition plate of the shield case and communicating the inside of the circuit block and the outside of the case. The temperature rise of the apparatus can be effectively suppressed. And the temperature rise of the radio base station apparatus using the circuit board device can be effectively suppressed.

A circuit board device of the present invention and a radio base station device using the circuit board device will be described in detail with reference to the drawings.
FIG. 1 is a schematic perspective view of a radio unit used in the radio base station apparatus, FIG. 2 is a schematic bottom view of a shield case of a circuit board device constituting the radio unit, and FIG. -A shows a cross-sectional view.

As shown in FIG. 6, a base station 1 that is a radio base station apparatus is configured by housing a large number of radio units 3 in a box-shaped rack 2 as shown in FIG. The rack 2 is divided into a plurality of stages of shelves along the vertical direction, and a plurality of wireless units 3 are juxtaposed on each shelf 21. In addition, a fan 4a that discharges the air in the rack 2 to the outside during operation is provided at the top of the rack 2, and a fan 4b that allows the outside air to flow into the rack 2 during operation is provided at the bottom of the rack 2. It has been. By the operation of these fans 4a and 4b, an air flow is generated in the rack 2 from below to above. Further, the shelf 21 is formed with a ventilation hole 22 between adjacent wireless units 3, and the air flow generated by the operation of the fans 4 a and 4 b passes through the ventilation hole 22. Air flow is generated.
Note that the fans 4 a and 4 b may be configured to generate air flow around the wireless unit 3.

As shown in FIG. 1, each wireless unit 3 includes a circuit board 5 (hereinafter referred to as a board) on which a large number of electronic components 6 such as IC chips on which transistors forming various wireless communication circuits are mounted, A circuit board device having a shield case 7 for shielding the substrate 5 is provided.
The shield case 7 is made of aluminum die cast having electrical conductivity, and is formed so that the bottom surface is opened in a generally casing shape. The shield case 7 is designed to prevent the electronic component 6 on the substrate 5 from being affected by interference waves from the outside of the case, and to prevent the high frequency radiated from the electronic component 6 from affecting other circuits. The electronic component 6 is integrally disposed on the substrate 5 so as to cover the electronic component 6. Since the substrate 5 has electronic components mounted on both surfaces (upper and lower surfaces in FIG. 1), the shield case 7 is disposed on both surfaces of the substrate 5.

  A plurality of circuit blocks 9a to 9f are disposed on the substrate 5, and the shield case 7 has a partition plate 10a for partitioning the circuit blocks 9a to 9f from the outside of the case and adjacent circuit blocks. To 10 g. The end faces of the partition plates 10a to 10g are conductively joined to an earth site such as the earth pattern 8 provided on the substrate 5. And the communicating paths 11a-11g for connecting the circuit blocks 9a-9f and the case exterior are formed in the partition plates 10a-10g.

  Specifically, as shown in the bottom view of FIG. 2, the shield case 7 communicates the circuit blocks 9a and 9b and the outside of the case with the outer partition plates 10a and 10b that partition the circuit blocks 9a and 9b and the outside of the case. External communication passages 11a and 11b are formed. Further, the inner partition plate 10c that partitions the circuit block 9a and the circuit block 9c is formed with an internal communication path 11c that communicates both circuit blocks 9a and 9c. The circuit block 9c includes the internal communication path 11c, the circuit block 9a, It communicates with the outside of the case via the external communication path 11a. The inner partition plate 10d that divides the circuit block 9c and the circuit block 9d is formed with an internal communication path 11d that communicates the circuit blocks 9c and 9d. The circuit block 9d includes the internal communication path 11d, the circuit block 9c, It communicates with the outside of the case through the internal communication path 11c, the circuit block 9a, and the external communication path 11a.

Further, the inner partition plate 10g that partitions the circuit block 9b and the circuit block 9f is formed with an internal communication path 11g that communicates the circuit blocks 9b and 9f. The circuit block 9f includes the internal communication path 11g, the circuit block 9b, It communicates with the outside of the case via the external communication path 11b. Further, the inner partition plate 10f that partitions the circuit block 9e and the circuit block 9f is formed with an internal communication path 11f that communicates both circuit blocks 9e and 9f. The circuit block 9e includes the internal communication path 11f, the circuit block 9f, It communicates with the outside of the case through the internal communication path 11g, the circuit block 9b, and the external communication path 11b.
Also, an internal communication path 11e that connects the circuit blocks 9d and 9e is formed in the inner partition plate 10e that partitions the circuit block 9d and the circuit block 9e.
Therefore, the circuit blocks 9a to 9f on the substrate 5 are communicated with the outside of the case via the communication paths 11a to 11g.

  In these communication paths 11a to 11g, as shown in FIG. 4, a partition member 12 formed of a metal member in a wire mesh shape is disposed. The partition member 12 allows air to pass through the communication passages 11a to 11g and shields interference waves from the outside of the case and high frequencies radiated from electronic components so that the shielding effect of the partition plates 10a to 10g can be maintained. It is configured. The partition member 12 is disposed on the outer surface side of the external communication paths 11a and 11b, and is disposed in the entire area of the internal communication paths 11c to 11g. In addition, the partition member 12 may be arrange | positioned only in the one surface side of the internal communication paths 11c-11g, even if it is not arrange | positioned in the whole area of the internal communication paths 11c-11g.

Furthermore, in the external communication passages 11a and 11b, electric small fans 13a and 13b, which are blowers, are disposed on the inner surface side. The small fan 13a arranged in the external communication path 11a allows air outside the case to flow into the shield case 7 (circuit block 9a) during operation, and the small fan 13b arranged in the external communication path 11b operates as a shield case during operation. 7 (circuit block 9b) is arranged to flow out of the case. The shelf 21 is also formed with a ventilation hole 22 at a portion facing the external communication path 11a.
Further, the power supply terminals 14a and 14b of the small fans 13a and 13b are embedded in the outer partition plates 10a and 10b of the shield case 7, and the power supply terminal 14a is provided on the substrate 5 facing the power supply terminals 14a and 14b. , 14b is provided with power supply terminals 15a, 15b. When the shield case 7 is disposed on the substrate 5, the power terminals 14a and 14b of the small fans 13a and 13b and the power supply terminals 15a and 15b on the substrate 5 are joined to supply power to the small fans 13a and 13b. It becomes. With such a configuration, the arrangement configuration of the small fans 13a and 13b on the partition plate 10 and the power supply circuit configuration of the small fans 13a and 13b can be simplified, and the assembling property is also improved.

In addition, a large number of fins 16 are formed on the back surface of the shield case 7 in order to prevent the wireless unit 3 from rising in temperature as the electronic component 6 generates heat. The fin 16 can dissipate the heat absorbed by the shield case 7 due to heat generated by the electronic component 6 in the circuit block.
A plurality of fins 16 are provided on the back surface of the shield case 7 so as to extend in the vertical direction of the rack 2 when the wireless unit 3 is stored in the rack 2. Therefore, when an air flow is generated around the wireless unit 3 by the operation of the fans 4a and 4b arranged in the vertical direction of the rack 2, the rack 2 in the extending direction of the fin 16 is near the fin 16. Air flow is generated along the vertical direction.
Further, the external communication paths 11 a and 11 b of the shield case 7 are formed in the outer partition members 10 a and 10 b positioned in the vertical direction of the rack 2. Therefore, the air flow between the inside and the outside of the shield case 7 is generated along the vertical direction of the rack 2.
As described above, in the communication paths 11a to 11g and the fins 16, the direction of air flow between the inside of the case and the outside of the case via the communication paths 11a to 11g and the direction of air flow in the vicinity of the fins 16 substantially coincide. It is arranged like this.

Next, the operation of the radio base station apparatus in this embodiment will be described.
Since various electronic components 6 such as transistors disposed in the circuit blocks 9a to 9f in the wireless unit 3 are heat generating components, the circuit blocks 9a to 9f are heated by the heat generated by the electronic components 6 and the heat A part is absorbed by the shield case 7. The heat absorbed by the shield case 7 is dissipated from the fins 16 disposed on the back surface of the shield case 7, and the temperature rise of the wireless unit 3 is suppressed.

  Further, external communication paths 11a and 11b are formed in the outer partition plates 10a and 10b of the shield case 7 of the wireless unit 3 positioned in the vertical direction of the rack 2, and the inner communication paths 11c are formed in the inner partition plates 10c to 10g of the shield case 7. To 11g and the circuit blocks 9a to 9f are communicated with the outside of the case, it is possible to generate an air flow between the circuit blocks 9a to 9f and the outside of the case. The heat generated in 9a to 9f can be released to the outside of the case by the air flow, and the temperature rise of the wireless unit 3 can be suppressed.

  Further, when the temperature in the rack 2 becomes equal to or higher than the first predetermined temperature, at least one of the fans 4 a and 4 b arranged above and below the rack 2 is operated to generate an air flow in the rack 2. Then, the air flow is generated around the wireless unit 3 by the operation of the fans 4a and 4b, and the air flow is also generated in the vicinity of the fins 16 disposed on the back surface of the shield case 7, whereby the fins 16 are cooled. Thus, heat dissipation from the fins 16 is promoted, and the wireless unit 3 is further cooled.

Further, when air flow is generated around the wireless unit 3 by the operation of the fans 4a and 4b, the air outside the case flows into the shield case 7 from one of the external communication paths 11a and 11b, and the circuit blocks 9a to 9 in the case. 9f flows out of the case from the other of the external communication paths 11a and 11b through the internal communication paths 11c to 11g.
Therefore, the air flow between the circuit blocks 9a to 9g and the outside of the case is promoted, so that more heat in the circuit block 9 flows out to the outside of the case, and the wireless unit 3 is cooled more effectively. It will be.
In addition, since the air flow direction in the vicinity of the fins 16 and the air flow direction inside and outside the shield case 7 through the communication passage 11 are substantially the same in the vertical direction, both air flows can be further promoted. The cooling effect of the wireless unit 3 due to air flow can be enhanced.

  Next, when the temperature of the shield case 7 detected by a temperature sensor (not shown) or the temperature in the shield case 7 is equal to or higher than the second predetermined temperature, the small fans 13a and 13b are activated. By the operation of the small fans 13a and 13b, the air outside the case flows into the shield case 7 from the external communication path 11a as shown in FIGS. 2 and 3, and the circuit is connected via the internal communication paths 11c to 11g. It flows in the blocks 9a to 9g and flows out of the case from the external communication path 11b. Therefore, the air flow in the circuit blocks 9a to 9g is forcibly generated to cool the circuit blocks 9a to 9g, and the cooling of the wireless unit 3 is promoted.

  Further, in the present embodiment, external communication paths 11a and 11b are provided in the outer partition plate 10a on one side in the vertical direction of the rack 2 and the outer partition plate 10b on the other side, and the external communication path 11a on the one side is provided outside the case. A small fan 13a is arranged so that air flows into the shield case 7, and a small fan 13b is arranged in the other external communication path 11b so that the air inside the shield case 7 flows out of the case. Therefore, as indicated by arrows in FIGS. 2 and 3, the flow direction of the air flow in the shield case 7 becomes one direction, and cooling by the air flow in the shield case 7 can be performed efficiently.

  Further, in the present embodiment, communication paths 11a to 11g are formed in the partition plates 10a to 10g, and the circuit blocks 9a to 9g communicate with the outside of the case and other circuit blocks. The communication paths 11a to 11g Since the conductive partition plate 12 capable of air flow is disposed, the air flow between the inside of the shield case 7 and the outside of the case is enabled to allow the wireless unit 3 to be cooled and from the outside of the case. Therefore, the shielding effect of the shield case 7 can be maintained.

This is the end of the description of the circuit board device of the present invention and the radio base station device using the circuit board device. However, the present invention is not limited to the above-described embodiment, and does not depart from the present invention. It can be changed.
For example, the small fans 13a and 13b may be operated when the temperature in the rack 2 becomes equal to or higher than a third predetermined temperature higher than the first predetermined temperature.

  Moreover, you may make it arrange | position the small fans 13a and 13b only in either one of the external communication paths 11a and 11b. Even in such a case, due to the operation of the small fan, the air outside the case flows into the shield case 7 from one external communication path, and the air inside the shield case 7 flows out of the case from the other external communication path. As in the above-described embodiment, the air flow between the inside of the shield case 7 and the outside of the case can be forcibly generated by the operation of the small fan, and the wireless unit 3 can be suitably cooled. . A similar effect can be obtained even if a small fan is disposed in the internal communication path. There is no limit to the number of small fans installed. Even if a small fan is not provided, the partition plate is provided with a communication path that connects the circuit block and the outside of the case, so that when the air generated around the wireless unit 3 flows, the circuit block and the outside of the case In this way, the wireless unit 3 can be cooled.

  Further, the partition member 12 is composed of a conductive member without being formed in a wire mesh shape, and shields the interference wave from the outside of the case and the high frequency radiated from the electronic component to maintain the shielding effect of the partition plate 10. And what is necessary is just the structure in which passage of air is possible. Or, even if the partition plate 12 is not provided in the communication path 11, the communication path 11 is formed by a large number of small diameter holes 17 as shown in FIG. It may be configured to be shielded so as to maintain the shielding effect of the partition plate 10 and allow the passage of air.

It is an outline perspective view of the radio unit using the circuit board device concerning a 1st embodiment of the present invention. It is a schematic bottom view which shows the structure of the shield case of the radio | wireless unit using the circuit board apparatus concerning 1st Embodiment of this invention. It is AA sectional drawing of FIG. It is a partial enlarged detail drawing which shows 1st Embodiment of this invention. It is a partial expanded detail drawing which shows the modification of this invention. 1 is an overall overview diagram of a radio base station apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Radio base station apparatus, 2 racks, 3 radio units, 4a, 4b fan, 5 board | substrate, 6 electronic component, 7 shield case, 8 earth pattern, 9a-9f circuit block, 10a-10g partition plate, 11a-11g communication path , 12 Partition member, 13a, 13b Small fan, 14a, 14b Power supply terminal, 15 Power supply terminal, 16 Fin

Claims (5)

A circuit board on which electronic components are mounted;
A partition plate is formed on the circuit board so as to cover the electronic component and is formed in a substantially casing shape, and partitions the circuit block on the circuit board from the outside and other circuit blocks. A shield case,
In a circuit board device having
The shield case has a communication path that is formed on the partition plate and communicates between the circuit block and the outside of the shield case.
A circuit board device. A conductive partition member that allows air flow between the circuit block and the outside of the shield case is disposed in the communication path.
2. The circuit board device according to claim 1, wherein: The communication path is provided with a blower that allows air outside the case to flow into the shield case or allows air inside the shield case to flow out of the case.
The circuit board device according to claim 1, wherein the circuit board device is a circuit board device. The circuit board device according to any one of claims 1 to 3 is configured as a part of a radio base station, and is arranged in a rack.
A radio base station apparatus. A blower for generating an air flow around the circuit board device during operation is disposed in the rack.
The radio base station apparatus according to claim 4.

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