JP3129405B2 - High power amplifier - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high power amplifier, and more particularly to an improvement in a heat dissipation structure of a high power amplifier.

[0002]

2. Description of the Related Art Conventionally, in order to establish satellite communication,
A large transmission power is required to compensate for a large propagation loss peculiar to satellite communication. Therefore, for example, an output 3 using a 14 GHz band klystron or traveling wave tube at the final stage
A high power amplifier of 0 to 300 W is used. This high power amplifier has an automatic level control mechanism combined with a transmission frequency converter.

[0003] In the case of a small satellite communication earth station device, the above-mentioned high power amplifier is usually arranged near a parabolic antenna. Even in a large power amplifier used in a small satellite communication earth station device, the output power becomes large, so that the heat generation of the internal parts cannot be avoided. In particular, the heat generated from the traveling wave tube rises to around 100 ° C. On the other hand, many electronic components are arranged inside the high power amplifier, and some of them are not suitable for use in a high temperature environment, such as a transmission frequency converter. Therefore, an efficient heat dissipation structure of the high power amplifier is required.

For example, Japanese Utility Model Laid-Open Publication No. 60-59570 discloses a large power amplifier 1 of a small satellite communication earth station apparatus having an air-cooled heat radiation structure as shown in FIG.
A radiating fin 3 that radiates heat generated by internal heat-generating components such as an internal traveling-wave tube amplifier 2 to the outside of the housing 1a is fixed to the surface of the housing 1a of the high power amplifier 1. In this high power amplifier 1, by connecting the radiation fin 3 to the back surface of the parabolic antenna 4, the heat transmitted to the radiation fin 3 can be transferred to the parabolic antenna 4 having a larger surface area.
To dissipate heat. That is, on the surface of the radiation fin 3, the female metal fitting 5 for connecting the case 1a including the radiation fin 3 and the parabolic antenna 4 is fixed.
A male fitting 6 that engages with the female fitting 5 is fixed to the back surface of the parabolic antenna 4. Then, by closely connecting the two, the parabolic antenna 4 is connected to the radiation fin 3.
The heat dissipation capacity of the large power amplifier 1 is improved with an easy configuration by using the heat diffusion area as a part of the power amplifier.

[0005]

However, like the high power amplifier 1 described above, the parabolic antenna 4
In order to tightly connect, the connection surface between the female fitting 5 and the radiation fin 3, the connection surface between the male fitting 6 and the parabolic antenna 4, and the contact surface between the female fitting 5 and the male fitting 6 must be precisely machined. However, there is a problem that parts cost is increased. In addition, since the above-described large power amplifier 1 is in close contact with the parabolic antenna 4, the inflow of outside air into the radiation fins 3 is prevented, and the radiation efficiency of the radiation fins 3 is reduced.
There is a problem that the heat radiation rate of the high power amplifier 1 itself decreases, the internal temperature increases in a short time, and the electrical performance of the internal electronic components decreases.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide efficient heat radiation while improving assemblability and maintenance with a simple structure without increasing the cost of parts. It is an object of the present invention to provide a high power amplifier capable of performing the following.

[0007]

To achieve SUMMARY OF for the] said object, the present invention provides a high-power amplifier connected to a parabolic antenna of the satellite communications earth station, Ru is connected to the housing of the high power amplifier radiator A fin, wherein the release
A plurality of heat fins connected and separated on the non-connection side
And radiating fins for dissipating heat from heat-generating components to the outside, before
The non-connection side heating part is located above the connection side heating part of the heat radiation fin.
A support member for pressing and fixing an article on the inner wall of the housing, and a member for connecting the housing and the parabolic antenna via the radiating fins, and having a ventilation opening for flowing a cooling airflow into the radiating fins. And a connection member.

[0008]

[0009]

In order to achieve the above object, according to the present invention, the supporting member presses and fixes the non-connection-side heat-generating component to the inner wall of the housing via a heat-conductive soft member.

According to another aspect of the present invention, there is provided a fixing member for contacting and fixing a high-frequency coaxial cable disposed inside the housing to an inner wall of the housing or a connecting member connected to the inner wall of the housing. Shall be.

Further, in order to achieve the above object, in the present invention, at least one of the housing and the radiating fin has a surface made of a non-heat-absorbing color.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings.

Embodiment 1 FIG. 1 is an external perspective view of a small satellite communication earth station device 8 including the high power amplifier 7 according to the first embodiment. In the case of the first embodiment, the large power amplifier 7 is fixed to a frame 9 a on the rear side of the parabolic antenna 9 by a mounting bracket 10. Like the conventional high power amplifier 1 shown in FIG. 7, the high power amplifier 7 has electronic components such as a traveling wave tube amplifier and a frequency converter built therein, and the traveling wave tube amplifier, the frequency converter and the like. A radiating fin 11 for radiating heat generated from the outside to the outside is fixedly connected to the housing case 7 a of the high power amplifier 7.
In the case 7a, since the internal atmosphere temperature is higher in the upper part, the radiation fins 11 are fixed so as to be on the upper surface side of the case 7a. That is, in the present embodiment, the radiating fins 11 cover the housing case 7a from above.

FIG. 2 is an enlarged view of the mounting bracket 10. As shown in FIG. 2, the mounting bracket 10 includes an amplifier-side bracket 10a fixed to the high power amplifier 7 side and an antenna-side bracket 10b fixed to the frame 9a side of the parabolic antenna 9. In the case of the first embodiment, the amplifier-side bracket 10a and the antenna-side bracket 10b are formed by bending a relatively easy-to-process aluminum plate material, and are mounted on the guide rail 12 formed on the amplifier-side bracket 10a. Guide bar 1 formed on 10b
The engagement and fixing of the two joints are performed.
A stopper 12a is formed at one end of the guide rail 12, and the antenna-side metal fitting 10b is positioned.

The first embodiment is characterized in that a mounting bracket 10 for fixing the high power amplifier 7 to the frame 9a of the parabolic antenna 9 is mounted across the radiating fins 11, and the mounting fin 11 is attached to the mounting bracket 10. Is formed with a ventilation port 14 for supplying a cooling air flow to the air flow. As shown in FIG. 2, the amplifier-side metal fitting 10a is composed of a flat portion 10a1 and vertical portions 10a2 (only one side is shown) formed at both ends thereof.
a1 is in contact with the upper surface of the radiation fin 11, and the vertical portion 10a2 is in contact with the side surface of the radiation fin 11.
The vertical portion 10a2 is fixed to the case 7a of the high power amplifier 7 with screws 15 or the like. Ventilation holes 14a and 14b for supplying cooling air to the radiating fins 11 are formed in the plane portion 10a1 and the vertical portion 10a2 of the amplifier side fitting 10a, respectively. As shown in FIG. 2, the plane portion 10a1 has a large-diameter square hole-shaped ventilation port 14.
a is formed, the vertical section 10a 2, circular vents 1
4b are formed in a plurality (in this embodiment, five openings are shown, but the number is arbitrary). By providing ventilation holes 14a and 14b in the amplifier-side bracket 10a, it is possible to prevent the radiation surface of the radiation fin 11 from being covered,
It is possible to prevent heat from being trapped around the mounting portion of the amplifier-side metal fitting 10a, and to allow cooling air to flow into the heat radiation surface of the heat radiation fins 11 for efficient heat radiation (cooling).

On the other hand, the antenna-side fitting 10b is formed by bending an aluminum plate as described above, and includes a flat portion 10b1 and a vertical portion 10b2. Since the vertical portion 10b2 is formed, even when the amplifier-side bracket 10a and the antenna-side bracket 10b are connected, a gap is formed between the frame 9a of the parabolic antenna 9 and the radiation fin 11 by the vertical portion 10b2. And
The frame 9a and the like do not hinder the heat radiation action of the heat radiation fins 11.

As described above, by providing the ventilation holes 14 in the mounting bracket 10 for connecting the large power amplifier 7 and the parabolic antenna 9, the large power amplifier 7 and the parabolic antenna 9 can be connected without disturbing the heat radiation action of the radiation fins 11. Can be fixed. Further, since the mounting bracket 10 does not require processing accuracy and can be formed by bending or the like, parts can be simplified and the parts cost can be reduced. In the present embodiment, an example is shown in which the mounting bracket 10 is made of aluminum, but any material can be used as long as it has a good heat transfer property and is easy to process. Although the amplifier-side fitting 10a1 can be provided at any position of the high power amplifier 7, the amplifier-side fitting 1a1
Since heat is also likely to be trapped in the contact surface between Oa1 and the high power amplifier 7, it is desirable to arrange the fins 11 so as to straddle the radiating fins 11 having the highest radiating effect. Further, in the case of the first embodiment, since the large power amplifier 7 is disposed on the back side of the parabolic antenna 9, it is possible to prevent direct sunlight from being applied to the large power amplifier 7. 7
Can be prevented from being heated.

Embodiment 2 FIG. 3 shows an example of the arrangement of internal components of high power amplifier 7 shown in the first embodiment. As described above, inside the high-power amplifier 7, the traveling wave tube amplifier 16 and the frequency converter 17, and the traveling wave tube amplifier 16 and the frequency converter 17 are connected as electronic components having a large heat value. Coaxial cable 18 is included. The traveling-wave tube amplifier 16 is a component that generates the largest amount of heat in the high-power amplifier 7.
At ~ 150W, the heat generation becomes about 90 ° C. On the other hand, the power consumption of the frequency converter 17 is about 50 W, but the optimum use temperature is about 55 ° C. Therefore, the second embodiment
Then, the traveling wave tube amplifier 16 among the heat generating components is arranged on the inner wall surface side of the radiating fin 11, and the frequency converter 17 is connected to the inner wall surface on the non-connection side of the radiating fin 11 (in the second embodiment, the casing case). 7a). In this way, by disposing the heat-generating parts facing each other,
It is possible to reduce mutual temperature effects. That is,
By disposing the traveling-wave tube amplifier 16 having a large heat value on the inner wall of the radiation fin 11 as in the second embodiment,
Efficient heat radiation of the traveling wave tube amplifier 16 can be performed. The frequency converter 17 is provided with the traveling wave tube amplifier 1.
6, the heat influence from the traveling-wave tube amplifier 16 can be reduced, and heat radiation using the housing case 7a can be effectively performed.

Therefore, if the high power amplifier 7 configured as in the second embodiment is connected and fixed to the parabolic antenna 9 as shown in FIGS. Can be reduced, and efficient heat radiation can be performed by the ventilation holes 14 provided in the mounting bracket 10.

Embodiment 3 FIG. 4 shows a high power amplifier 7.
Of the other internal components are shown. The third embodiment also improves the heat radiation efficiency by separately arranging the internal heat-generating components as in the above-described second embodiment, but in the example shown in FIG. Since the frequency converter 17 is arranged and the traveling-wave tube amplifier 16 is arranged on the inner wall surface of the radiating fin 11 facing the frequency converter 17, the frequency converter 17 and the traveling-wave tube amplifier 16 are connected by a long coaxial cable 18. After the connection, it is necessary to assemble the housing case 7a and the radiating fins 11, and the workability at the time of assembling and maintenance disassembly is not so good. FIG.
In consideration of this point, the structure shown in FIG. 3 is obtained by stacking the frequency converter 17 and the traveling-wave tube amplifier 16 on the radiating fin 11 using spacers 19a and 19b. The spacers 19a and 19b are desirably made of a material that is easy to process and has good heat transfer properties, such as aluminum.

As shown in FIG. 4, a traveling-wave tube amplifier 16 having a large heat value is covered with a box-shaped spacer 19a, and a plate-shaped spacer 19b is mounted on the upper surface thereof. The frequency converter 17 is held by the spacer 19b. ing. The height of the spacer 19b is adjusted so that the frequency converter 17 comes into close contact with the inner wall surface of the housing case 7a when the housing case 7a is assembled to the heat radiation fins 11. At this time, in the third embodiment, the spacers 19a and 19b are provided with a spring property in order to bring the frequency converter 17 into close contact with the housing case 7a. In the example of FIG. 4, the spacers 19a, 1
The close contact is realized by using the bending of 9b. Therefore, when the housing case 7a and the heat radiation fins 11 are connected, the arrangement is the same as that shown in FIG. 3, and the same heat countermeasure effect and heat radiation effect can be obtained.
a can be detached independently, and the work at the time of assembly and maintenance disassembly can be performed very easily. In the case of the third embodiment, the spacer is separated into two, and one of the box-shaped spacers 19a covers the traveling-wave tube amplifier 16 that generates a large amount of heat to reduce the thermal effect on other electronic components. The same effect can be obtained even if the frequency converter 17 is held by a single spacer. Also,
The spacer 19b may be a simple plate material, but the housing case 7a
In order not to hinder the convection of air inside, a plurality of ventilation holes 2
0 may be provided to improve the heat radiation effect.

Embodiment 4 FIG. 5 shows still another example of the internal structure of the housing case 7a. Note that members having the same configuration as in the above-described third embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In the case of the third embodiment, since the frequency converter 17, which is a heat-generating component, must be in close contact with the housing case 7a, the spring properties of the spacers 19a and 19b are used. In the example shown, a soft heat conductive sheet 20 having elasticity is attached to the housing case 7 a and the frequency converter 17.
To achieve indirect close contact between the two, and generate heat generated by the frequency converter 17 in the housing case 7a.
And efficiently dissipates heat. The heat conductive sheet 2
As the material of No. 0, for example, silicone rubber containing a high ratio of alumina having excellent thermal conductivity can be used. As described above, by using the soft heat conductive sheet 20 having elasticity, the frequency converter 17 can be stably and indirectly adhered to the housing case 7a. In the case of the fourth embodiment, since the heat conductive sheet 20 is compressed and deformed, the dimensional accuracy of the spacers 19a and 19b is not required, and the processing cost can be reduced.

Embodiment 5 FIG. FIG. 6 shows still another example of the internal structure of the housing case 7a. Note that members having the same configuration as in the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In the case of the fifth embodiment, the traveling-wave tube amplifier 1
6 is coaxial, and the traveling wave tube amplifier 16 and the waveguide circuit 2 are connected by a coaxial cable 18.
3 is an example of connection. The traveling-wave tube amplifier 16 is covered with a box-shaped spacer 19a as in the third embodiment, but the frequency converter 17 is
a and is not in contact with the housing case 7a.

On the other hand, since the coaxial cable 18 is connected to the high-frequency output section 22, the coaxial cable 18 becomes hot due to loss of the cable. Therefore, it is desirable to have an efficient heat dissipation structure. Therefore, the fifth embodiment
In this case, the bracket 24 tightly fixes the coaxial cable 18 to the spacer 19a, and transfers the heat generated by the coaxial cable 18 to the radiating fins 11 via the spacer 19a to radiate heat.

As described above, by connecting the heat-generating electronic components directly and indirectly to the heat radiation fins 11, efficient heat radiation can be achieved. In the example of FIG. 6, a part of the coaxial cable 18 is fixed by the bracket 24. However, if the coaxial cable 18 is divided into several parts and connected to the spacers 19a and the radiating fins 11, more efficient heat radiation is performed. be able to. Further, in the fifth embodiment, the configuration in which the frequency converter 17 is separated from the housing case 7a is shown. However, even in the configuration in which the frequency converter 17 is in contact as in the third embodiment and the like, efficient heat radiation can be performed. .

Further, in the examples shown in the above embodiments, it is necessary to minimize the heat absorption from the outside in order to perform more effective heat radiation. for that reason,
For example, it is desirable that the surface color of the high power amplifier 7 (housing case 7a) and the radiation fins 11 be non-heat absorbing colors. As the non-heat-absorbing color, for example, white or silver,
It is a color that reflects sunlight and the like. With such a non-heat-absorbing color, the housing case 7a
In addition to preventing the temperature of the fins 11 and the like from rising, the heat generated inside can be efficiently radiated from the fins 11 and the like.

[0030]

As described above, according to the present invention, by connecting the high power amplifier and the parabolic antenna with the connecting member having the ventilation hole, the cooling air flow can be provided to the radiation fin. Therefore, efficient heat radiation can be performed from the radiation fins. In addition, since the connecting member only connects the high power amplifier and the parabolic antenna, the connecting member can be formed with a low cost and simple configuration without requiring high processing accuracy.

Further, by placing opposing separation of fever components, the temperature mutual interference is reduced, it is possible to prevent partial concentration of the heat generation, it is possible to improve the individual radiation efficiency .

At this time , since the non-connection-side heat-generating component is pressed and fixed to the inner wall of the housing by the support member, temperature interference between the plurality of heat-generating components is reduced, and partial concentration of heat can be prevented. The heat radiation efficiency can be improved for each individual, and since the components are not fixed to the housing side, the housing can be configured as a single unit, which facilitates assembly and disassembly.

Further, according to the present invention, since the non-connection-side heat-generating component is pressed and fixed to the inner wall of the housing via the heat-conductive soft member, the non-connection-side heat-generating component is easily and favorably mounted on the inner wall of the housing. It is possible to improve the heat radiation efficiency of each heat-generating component while reducing the mutual temperature interference of the heat-generating components. Further, since the processing accuracy of the support member holding the non-connection-side heat-generating component is not required, an efficient heat radiation effect can be obtained with a low-cost component.

Further, according to the present invention, the high-frequency coaxial cable is fixed to the inner wall of the housing or the connecting member connected to the inner wall of the housing by the fixing member, so that the high-frequency coaxial cable can be efficiently radiated. .

Further, according to the present invention, since at least one surface of the housing or the radiating fin is made of a non-heat absorbing color, a temperature rise of the high power amplifier due to an external factor is suppressed, and the temperature from the inside is reduced. Heat can be efficiently dissipated.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating the appearance of a small satellite communication earth station device having a high power amplifier according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram illustrating connection between a high-power amplifier and a parabolic antenna according to the first embodiment of the present invention.

FIG. 3 is an explanatory diagram illustrating an internal configuration of a high power amplifier according to a second embodiment of the present invention.

FIG. 4 is an explanatory diagram illustrating an internal configuration of a high power amplifier according to a third embodiment of the present invention.

FIG. 5 is an explanatory diagram illustrating an internal configuration of a high power amplifier according to a fourth embodiment of the present invention.

FIG. 6 is an explanatory diagram illustrating an internal configuration of a high power amplifier according to a fifth embodiment of the present invention.

FIG. 7 is a perspective view illustrating the configuration of a conventional small satellite communication earth station device.

[Explanation of symbols]

Reference Signs List 7 high power amplifier, 7a housing case, 8 small satellite communication earth station device, 9 parabolic antenna, 9a frame, 10 mounting bracket, 11 radiation fin, 14, 14
a, 14b Ventilation opening.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-241229 (JP, A) JP-A-59-219996 (JP, A) JP-A 60-59570 (JP, U) JP-A 58- 109293 (JP, U) Hikaru Hei 2-137081 (JP, U) Hikaru Hei 2-101578 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H03F 1/30 H03F 1 / 52 H05K 5/00-7/20

Claims (4)

(57) [Claims] 1. A high-power amplifier connected to a parabolic antenna of the satellite communications earth station, a radiation fins connected to Ru in the housing of the high power amplifier,
Inside the housing, the radiating fin connection side and the non-connection side are paired.
A radiating fin for radiating heat from a plurality of heat-generating components to the outside, and a non-connection-side heat source above the heat-generating component on the connection side of the heat-radiating fin.
A support member for pressing and fixing components to the inner wall of the housing, and a member for connecting the housing and the parabolic antenna via the radiating fins, and having a ventilation opening for flowing a cooling airflow into the radiating fins And a connecting member. Wherein said support member is high-power amplifier according to claim 1, characterized in that the pressed and fixed via a thermally conductive soft member unconnected side heat-generating component in the housing wall. Wherein the claim RF coaxial cable arranged inside the housing and having a fixing member in contact fixed to the connected connecting member in the housing wall or housing wall 1 or claim 2 A high power amplifier as described. Wherein said housing or at least one surface of the heat radiating fins high power amplifier according to any one of claims 1 to 3, characterized in that it is constituted by a non-thermal absorption color.