JPH07245950A - Power supply device for traveling-wave tube - Google Patents

Abstract

PURPOSE:To inhibit internal stress by the resin mold of a high-voltage generating section while improving the effect of heat dissipation. CONSTITUTION:A power supply device for a travelling wave tube, in which a high-voltage generating section 7 with a rectifier circuit driven by a high-frequency inverter is housed and which has the resin-molded high-voltage generating section 7, is constituted. A base plate 17 consisting of the thick plate of aluminum, a right side face plate 19 and a left side face plate 21 are installed, and a printed board 23, on which the circuit parts of the high-voltage generating section 7 are mounted, is housed in the section surrounded by the base plate 17, the right side face plate 19 and the left side face plate 21 and molded with a silicone rubber 27. Heat generated in the high-voltage generating section 7 is transmitted over the silicone rubber 27 and transmitted over the nearest base plate 17, right side face plate 19 and left side face plate 21 and conducted with the base plate 17. Radiation fins 15 are fast stuck and fixed onto the base plate 17, thus promoting heat dissipation. Three internal surfaces with the base plate 17, the right side face plate 19 and the left side face plate 21 are fixed but other three surfaces are formed in exposed surfaces in the silicone rubber 27, thus reducing the internal stress of the silicone rubber 27.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device for a traveling wave tube,
In particular, it relates to a power supply device for a traveling wave tube having a small sealed structure.

[0002]

2. Description of the Related Art A traveling wave tube used for a microwave amplifier needs to heat a filament and supply a high voltage based on the cathode to each electrode, that is, collector, anode and helix. And these three types of high-voltage power supplies must be independently set and stabilized in voltage. Generally, the helix electrode of a traveling-wave tube is grounded for convenience of adjustment and protection, so that a high voltage for the helix is reflectedly applied to the cathode. Therefore, the potential of the cathode becomes about 10 kV, and the collector power supply, anode power supply, and filament power supply that are floatingly charged at the high potential are driven by the high-frequency inverter through the insulation transformer. In this way, the high-voltage generating part of the traveling-wave tube power source has many parts that are floatingly charged to a high potential, so insulation with a synthetic resin mold is effective for miniaturization. However, in this synthetic resin molding process, shrinkage stress occurs during curing. This stress causes inconveniences such as deformation of the outer peripheral mold case and disconnection of internal parts.

Another problem in resin molding is the problem of heat dissipation. The heat generated inside is also conducted by the mold resin and radiated to the outside, but its thermal conductivity is smaller than that of metal.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to suppress shrinkage of a high voltage generating part due to resin molding and to enhance heat dissipation effect in a traveling wave tube power supply device.

[0005]

The present invention proposes the following means in order to solve such a problem.
That is, a traveling-wave tube power supply device having a high-frequency inverter and a high-voltage generating section having a rectifying circuit driven by the high-frequency inverter, wherein the high-voltage generating section is a base made of a metal flat plate having a large thermal conductivity. A plate and a right side plate and a left side plate, which are arranged at a right angle to the base plate and are opposed to each other, and which are made of thick metal plates having high thermal conductivity, are provided, and between the base plate, the right side plate and the left side plate. A power supply device for a traveling-wave tube, characterized in that a printed circuit board on which components of a high voltage generating part are mounted is arranged in the inside, and is resin-molded inside a contour surface formed by these base plate, right side plate and left side plate. Is proposed.

It is also proposed that the right side plate and the left side plate are connected by a connecting member and attached to the base plate.

[0007]

[Function] Of the silicon rubber hexahedron that comprehensively molds the high voltage generating part, only the contact surfaces of the right side plate, the left side plate and the base plate are bonded and fixed, and the other three surfaces are exposed and are free end surfaces. Therefore, the internal stress as a whole is small. Further, the heat generated in the high voltage generating portion is conducted from the mold resin to the right side plate or the left side plate having a large thermal conductivity and then to the base plate to radiate heat.

[0008]

FIG. 1 is a circuit block diagram of an embodiment of the present invention. In FIG. 1, the traveling wave tube power supply device 2 is 48V.
The filament to the traveling wave tube 12 with the DC power source of
It supplies the necessary power to 12f, helix 12h, collector 12c, and anode 12a. This traveling wave tube power supply 2 includes an input circuit 1 having a filter circuit and an inrush current suppressing function, a high frequency inverter 3 for converting direct current into a high frequency of about 100 kHz, a transformer 5, a rectifier circuit, a smoothing circuit, and a detection circuit. It is composed of a high voltage generator 7 including the above, a control circuit 9, a high voltage cable 11 and a high voltage output terminal 13. The input circuit 1, the high frequency inverter 3, the high voltage generator 7, and the control circuit 9 of each of these components are mounted on a separate printed circuit board.

The structure of this traveling wave tube power supply device 2 is shown in FIG. In FIG. 2, only the structural arrangement of the high voltage generator 7 and the control circuit 9 is shown, and the others are omitted. The high voltage generator 7 has all the circuit components mounted on the printed circuit board 23, and the control circuit 9 has all the circuit components mounted on the printed circuit board 25. Structurally, all components are fixed to a thick aluminum base plate 17. This base plate 17 serves as a foundation for strength and conducts all heat generated inside. On the back of this base plate 17 is a radiation fin
15 is tightly fixed by screws (not shown). A right side plate 19 and a left side plate 21 made of thick aluminum plates parallel to each other are screwed (not shown) to the base plate 17. A printed circuit board 23 on which circuit components of the high voltage generator 7 are mounted is arranged in a contour space formed by the base plate 17, the right side plate 19 and the left side plate 21, and is molded with silicone rubber 27. Here, the silicon rubber 27 is the base plate 17 and the right side plate 19.
Each inner contact surface of the left side plate 21 is subjected to an adhesive treatment, and the silicon rubber 27 is exposed on the other surface.

Female screws 19a, 19b and 21a, 21b are formed on the upper elongated surfaces of the right side plate 19 and the left side plate 21, respectively. The printed circuit board 25 that accommodates the control circuit 9 corresponding to these female screws 19a, 19b, 21a, 21b is screwed through a spacer (not shown).

With respect to the high-voltage generating portion 7 thus molded with silicone rubber, the stress caused by the silicone rubber will be described with reference to FIG. Since the silicone rubber 27 is adhered to the three surfaces of the base plate 17, the right side plate 19 and the left side plate 21, stresses of arrows α, β and γ respectively act.
On the other hand, stresses indicated by arrows δ, ε and ζ are applied to the upper surface, the lower surface and the rear surface where the silicone rubber 27 is exposed. However, with respect to the stresses δ, ε, ζ, since the silicon rubber is exposed and it is a free end face, the magnitude of the stress is almost zero.

The end faces of the silicone rubber corresponding to the respective stresses α, β, γ, δ, ε, ζ are respectively associated with the uppercase letters of the Greek letters, and Α, Β, Γ, Δ, Ε, Ζ.
Then, the surface area of Γ and Β in this silicon rubber-molded hexahedron is the smallest compared to the surface area of the other end face, and Α is next smaller. In other words, the surface area of Α, Β, Γ of the fixed end surface of the silicon rubber molded hexahedron is smaller than that of the open end surface Δ, Ε, Ζ, so the shrinkage stress of the silicon rubber is small as a whole.

FIG. 4 is a partial structural view of another embodiment of the traveling-wave tube power supply device according to the present invention, in which the printed circuit board 23 and the silicone rubber 27 of the high voltage generator 7 are omitted. In this embodiment, the right side plate 19 and the left side plate 21 are molded via a connecting base plate 29 made of aluminum in order to improve the workability of the silicone rubber molding work. After the molding work, the base plate 17 is attached via the connecting base plate 29. Therefore, at the time of molding work, the large base plate 17 as in the embodiment shown in FIG. 1 is not fixed, so that workability is improved. Unlike the embodiment shown in FIG. 1, the internal heat of the silicon rubber 27 is conducted to the base plate 17 via the connecting base plate 29, so that the thermal conductivity is slightly reduced. Instead, the connection base plate 29 has holes.
29a is provided, and when the molding work is performed through a peeling mold (not shown), most of the silicon rubber 27 directly contacts the base plate 17 to generate heat as shown in the cross section in FIG. Keep good conduction conditions.

In the embodiment described above, the insulating medium of the high voltage generating section 7 uses silicon rubber, but not limited to silicon rubber, a thermoplastic resin such as epoxy resin can be used. Further, the base plate 17, the right side plate 19, the left side plate 21 and the like are not limited to aluminum, and may be replaced with a material having a large thermal conductivity such as an aluminum alloy, copper or a copper alloy.

[0015]

EFFECTS OF THE INVENTION The present invention has the characteristics as described above, and therefore, in the traveling wave tube power supply device, the internal stress of the resin-molded high voltage generating portion is reduced to prevent deformation of the outer peripheral mold case. , It is possible to prevent disconnection of internal parts. Also, there is a thick metal plate in which almost one surface of the mold resin is in contact with the base plate for heat dissipation, and the other two surfaces are in contact with the mold resin, and this metal plate is in contact with the base plate. Therefore, the mold resin has a good heat dissipation state. Further, since all the heat generating components are concentrated on the base plate, it is convenient when the traveling wave tube is arranged adjacent to the traveling wave tube power supply device.

[Brief description of drawings]

FIG. 1 is a circuit diagram of an embodiment of a traveling-wave tube power supply device according to the present invention.

FIG. 2 is a structural diagram of an embodiment of a traveling-wave tube power supply device according to the present invention.

3 is an explanatory diagram of a stress distribution in the structure shown in FIG.

FIG. 4 is a partial view of the structure of another embodiment of the traveling-wave tube power supply device according to the present invention.

5 is a cross-sectional view of the structure shown in FIG.

[Explanation of symbols]

1 ... Input Circuit 3 ... High Frequency Inverter 5 ... Transformer 7 ... High Voltage Generator 9 ... Control Circuit 11 ... High Voltage Cable 13 ... High Voltage Output Terminal 15 ... Heat Dissipation Fin 17 ... Base Plate 19 ... Right Side Plate
21 ... Left side plate 23 ... Printed circuit board 25 ... Printed circuit board 27 ... Silicon rubber 29 ... Connection base plate

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yukio Kinoshita 1-1-18 Takada, Toshima-ku, Tokyo Inside ORIGIN ELECTRIC CO., LTD. (72) Takashi Yamashita 1-1-6 Uchiyuki-cho, Chiyoda-ku, Tokyo Japan Within the Telegraph and Telephone Corporation (72) Inventor Yama ▲ Saki ▼ Mikio 1-1-6, Uchisaiwaicho, Chiyoda-ku, Tokyo Japan Telegraph and Telephone Corporation (72) Inventor Nobuhiro Takahashi 1-1-1, Uchisaiwaicho, Chiyoda-ku, Tokyo No. 6 Nippon Telegraph and Telephone Corporation

Claims (2)

[Claims] 1. A traveling-wave tube power supply device having a high-frequency inverter and a high-voltage generating unit having a rectifying circuit driven by the high-frequency inverter, wherein the high-voltage generating unit is a metal flat plate having a high thermal conductivity. And a right side plate and a left side plate, which are arranged at right angles to the base plate and are opposed to each other and are made of thick metal plates having a large thermal conductivity, and are provided with the base plate, the right side plate and the left side plate. A printed circuit board on which the components of the high voltage generating part are mounted is disposed between the base plate, the right side plate and the left side plate, and resin molding is performed inside the contour surface. Power supply for wave tubes. 2. The traveling wave tube power supply device according to claim 1, wherein the right side plate and the left side plate are connected to each other by a connecting member and attached to the base plate.