JP2667574B2 - Pulse generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention has a high-speed rising and uses a power source such as a particle accelerator or a high-frequency pulse generator to change a peak value. The present invention relates to a pulse generator capable of generating a small number of rectangular wave pulses.

(Prior Art) Conventionally, as a device for generating a rectangular wave pulse, a pulse forming circuit (PFN) in which a coil and a capacitor are connected in a ladder shape as shown in FIG. 2 has been mainly used. In recent years, in a particle acceleration power supply or a high-frequency particle accelerator used for a free electron radar, a fluctuation of a peak value is required to be about 1% in order to obtain a high quality particle beam. Improvements in pulse quality are required.
However, it is not always easy to reduce the fluctuation of the peak value due to the temporal fluctuation of the value of the load 6, the high voltage pulse transformer 4, other characteristics, and the floating capacitance and the floating inductance of the high voltage section. Therefore, as shown in FIG.
Attempts have been made to obtain a high-quality rectangular wave by using a variable coil 1 as a coil constituting a pulse shaping circuit to finely adjust the inductance value of the coil to reduce fluctuations in the peak value.

By the way, recently, the accelerating voltage of the particle beam has become increasingly higher, and accordingly, the pulse power supply has also become higher in voltage. Accordingly, it is necessary to increase the voltage of the pulse forming unit of the pulse generator. In such a situation, a method and a configuration for preventing the dielectric breakdown of the pulse forming portion must be considered. In the pulse shaping circuit shown in FIG. 2, as described above, since it is necessary to always adjust the variable coil 1 for fine adjustment of the pulse waveform, an air insulation method is generally employed. However, with this method, there is a limit to how high the voltage can be (the air insulation method is considered to be up to about 200 kv). Therefore, in place of the above-mentioned pulse shaping circuit, a method using a distributed constant line can be used as a method for generating a rectangular pulse having a high voltage, a sharp pulse waveform, and a small variation in the peak value. Became used.

That is, as shown in FIG. 3, the grounding tank (outer conductor) 7
A central conductor 9 and an intermediate conductor 8 are coaxially arranged in the inside to form a distributed constant line 24. At one end of this line, a pulse transformer 3 for supplying a high-voltage pulse and a switch 5 are arranged, and at the other end, a load 6 housed in a load-side grounding tank 10 is connected to an output conductor 17. It is connected to the central conductor 9 via the same. In order to improve the dielectric strength, an insulating oil 19 such as a transformer oil is provided around these.
Is filled. The grounding tank 7 of the distributed parameter line
And the load-side ground tank 10 are joined by flanges 11a and 11b. Thereby, compared with the air insulation system,
Ten times the insulation strength is obtained, and a high voltage ratio is possible.

(Problems to be Solved by the Invention) Meanwhile, in the pulse generator using the distributed constant line as described above, the output current is measured by connecting the through-type current transformer 21 around the output conductor 17 on the load side. It is installed and performed. In this case, the penetration type current transformer 21 is
And is supported and fixed to the load-side ground tank 10.

However, this method has problems to be solved as described below. That is, in the through-type current transformer 21,
In order to ensure an insulation distance from the output conductor 17, the through hole needs to be enlarged, and accordingly, the current transformer has been increased in size and weight. Further, in order to support the through type current transformer 21 which is large and heavy as described above,
A strong insulating support 13 was required, and the shape of the insulating support 13 had to be increased.

However, since it is necessary to accurately transmit the high-frequency output of the distributed constant line to the load, it is necessary to make the output conductor 17 as short as possible so that the line inductance of the output conductor 17 can be reduced. Therefore, the distance between the distributed constant line 24 and the load 6 becomes short, and the space between them becomes narrow. Therefore, it is necessary to arrange the large-sized through current transformer 21 and the insulating support 13 in this narrow space. Was structurally very difficult.

As shown in FIG. 3, when the feedthrough current transformer 21 is installed in the middle of the output conductor 17, the line inductance of the output conductor 17 affects the output terminal voltage of the distributed constant line. Since the pulse was not accurately transmitted to the load 6, the pulse generator was not satisfactory.

The present invention has been proposed in order to solve the above-mentioned drawbacks of the prior art, and an object of the present invention is to generate a high-voltage rectangular wave pulse having an extremely steep rising edge and a small fluctuation of the peak value. Another object of the present invention is to provide a pulse generator capable of accurately measuring an output current.

According to the present invention, a distributed constant line is formed by disposing a conductor coaxially in a grounded tank having a flange and filling an insulating medium for insulating cooling. In a pulse generator in which a switch element is connected to one end of the distributed constant line and a load housed in a ground tank having a flange is connected to the other end, a coaxial shape is formed around an output conductor of the distributed constant line. ,
And between the flange of the grounding tank containing the distributed constant line and the flange of the grounding tank containing the load,
A through current transformer is provided.

(Operation) According to the pulse generator of the present invention having the above configuration, the through-type current transformer can be firmly supported by being sandwiched and fixed by the flanges of two adjacent ground tanks, Further, the ground potential of the feedthrough current transformer can be stabilized. Furthermore, since the through-type current transformer is not installed in the load-side tank, the load-side tank can be reduced in size, and as a result, the output conductor can be shortened.

(Example) Hereinafter, an example of the present invention will be specifically described with reference to FIG. The same members as those of the conventional type shown in FIG. 3 are designated by the same reference numerals and the description thereof will be omitted.

In this embodiment, as shown in FIG.
A through-type current transformer 21 is provided around the periphery of the coil 17 so as to be located coaxially with the ground tank 7 containing the distributed constant line and the load-side ground tank 10 containing the load 6. It is arranged. Further, this penetration type current transformer 21 includes a flange 11a of the ground tank 7 and a flange 11b of the load-side ground tank 10.
And fixed with bolts and nuts.
Further, the output current of the feedthrough type current transformer 21 is
It is configured to be measured outside the grounded tank 10 via a lead wire 23 drawn from the.

The through hole of the through current transformer 21 is formed in a size that does not affect the distributed constant line.

In the pulse generator of the present embodiment having such a configuration, the penetration type current transformer 21 is connected to the flange 11a of the ground tank 7.
Since it is sandwiched and fixed by the flange 11b of the load side ground tank 10, its supporting strength is significantly improved. In addition, since the ground potential of the through-type current transformer 21 is fixed by the flanges 11a and 11b, it is hard to receive a disturbance due to a potential other than the output conductor 17, and stable current measurement can be performed. Furthermore, the through-type current transformer 21 conventionally housed in the load-side grounding tank 10 is arranged at the junction between the grounding tank 7 and the load-side grounding tank 10, thereby providing a load-side grounding tank.
The space within 10 can be significantly reduced. As a result, the length of the output conductor 17 can be shortened, so that the steep wave output of the distributed constant line can be accurately transmitted to the load 6.

Thus, according to this embodiment, the current measuring through-type current transformer of the output conductor can be firmly supported and fixed, and
The ground potential can be stabilized by fixing the feedthrough type current transformer to the grounding tank. Furthermore, the load-side tank can be reduced, and the output conductor can be shortened.

The present invention is not limited to the above-described embodiment, and the size of the feedthrough current transformer may be any as long as it does not affect the distributed constant line. The insulating medium in addition to the above insulating oils, SF ₆ gas may be a fluorocarbon or the like. Further, in the case of forming a distributed constant line, the number of coaxial layers is not particularly limited. Also, the flanges 11 of both grounding tanks 7, 10
The shapes of a and 11b are not particularly limited, and the means for fixing the penetration type current transformer to the flange is not limited to the method using bolts and nuts.

[Effects of the Invention] As described above, according to the present invention, coaxially around the output conductor of the distributed constant line, and between the grounding tank storing the distributed constant line and the grounding tank storing the load. By installing a feedthrough type current transformer as shown in the figure, it is possible to generate a high-voltage rectangular wave pulse with an extremely steep rise and little fluctuation in the peak value, and a pulse capable of accurate output current measurement. A generator can be provided. That is, according to the present invention, since the penetration type current transformer is sandwiched by the flanges, stable fixing is possible. Further, the ground potential can be stabilized by fixing the feedthrough current transformer to the ground tank. Since the through-type current transformer is not installed in the load side tank, the output conductor can be shortened by reducing the load side tank.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the pulse generator of the present invention, FIG. 2 is a circuit diagram showing a conventional pulse shaping circuit, and FIG.
FIG. 1 is a configuration diagram showing an example of a conventional pulse generator using a distributed constant line. 1 ... variable coil, 2 ... capacitor, 3, 4 ... pulse transformer, 5 ... switch, 6 ... load, 7 ... ground tank, 8 ... intermediate conductor, 9 ... center conductor, 10 ... Load-side ground tank, 11a, 11b …… Flange, 13 …… Insulated support, 1
7 ... output conductor, 19 ... insulating oil, 21 ... penetrating current transformer, 2
2 ... output terminal, 23 ... lead wire, 24 ... distributed constant line.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroshi Murase 2-1 Ukishima-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Inside the Toshiba Hamakawasaki Plant (72) Inventor Iwao Ishima 2-1 Ukishima-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa No. In the Toshiba Hamakawasaki Factory (56) References JP-A-60-96180 (JP, A) JP-A-1-313809 (JP, A)

Claims (1)

(57) [Claims] A conductor is arranged coaxially in a grounding tank having a flange, and is filled with an insulating medium for insulation cooling to form a distributed constant line. A switch element is connected to one end of the distributed constant line. A pulse generator connected to a load housed in a grounded tank having a flange at the other end, wherein the flange of the grounded tank houses the distributed constant line coaxially around the output conductor of the distributed constant line. A pulse generator, wherein a through-type current transformer is arranged between the flange of a grounded tank containing the load and the grounded tank.