JPH01164271A - Charged particle accelerating power supply device - Google Patents

Abstract

PURPOSE:To improve stability and low rippling property, by composing the frequency converter of an input power source, of a rectifier and an inverter, and by controlling the DC output voltage of the rectifier to keep it constant. CONSTITUTION:A charged particle accelerating power supply device is composed of a rectifier 1, an inverter 2, a transformer 3, a rectifier 4, and a short circuit device 5, and power is fed to a load 6. The inverter 2 is controlled to generate the output of alternating current having frequency equal to or higher the frequency of the input power source of the rectifier 1, and is controlled to keep the output voltage of the rectifier 4 constant. When load short-circuit is generated in the output of the rectifier 4, then the inverter 2 is controlled to turn the output of the inverter 2 OFF at a high speed. Besides, the short circuit device 5 is operated so that unnecessary voltage cannot be applied on the load 6 when the output of the inverter 2 is turned OFF. As a result, semi-permanent life can be guaranteed on this device.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an improvement of a charged particle acceleration power supply device for a neutral particle injection device in, for example, a nuclear fusion device.

(Prior Art) Conventionally, for example, as a charged particle acceleration power source for a neutron particle injection device in a nuclear fusion device, a maximum output voltage of 1
00 to 200 KVDC have been put into practical use.

FIG. 4 shows an example of the configuration of this type of power supply device. (Patent Application No. 6l-169242) In Fig. 4, 88 is an arc chamber, 8b is a first positive electrode, 8c is a second positive electrode, 8d is a negative electrode, and 8e is a ground electrode.
Book 11 by each element of ~8e! An ion source for accelerating positive ions, which is a load of the source device, is configured. On the other hand, 9 is an AC thyristor switch that converts the output from an AC power supply (not shown) into power.

10 is a transformer that transforms the output from this AC thalistor switch 9 to a predetermined size, and 13.23 is this transformer 10.
rectifiers for rectifying the outputs of the
．． 24 is a voltage divider that measures the output voltage from each of the rectifiers 13 and 23, 16 and 26 are bypass diodes,
18.28 is a tetrode vacuum tube which inputs the output voltage from the rectifier 13.23 and has a constant voltage control function and a high-speed cutoff function, respectively; 19.29 is a grounding terminal connected to the second positive electrode 8C in the ion source for accelerating positive ions; It is a voltage divider that measures the voltages applied between the electrode 8e and between the first positive electrode 1'i8b and the second positive electrode 8c.

In the power supply device for a neutral particle injection device having such a configuration, the AC thyristor switch 9 converts the DC voltage rectified by the rectifiers 13 and 23 via the transformer 10 into the voltage divider 14.
and 24, and the output voltages of the rectifiers 13 and 23 are controlled by feedback control of the measured values. In addition, the tetrode vacuum tube 18 is connected to the voltage divider 1
By feedback-controlling the output from 9, the voltage between the second positive electrode 8C and the ground electrode 8e is constantly controlled to a desired voltage value.

Similarly, the tetrode vacuum tube 28 controls the voltage between the first positive electrode 8b and the second positive electrode 80 at a constant voltage value by feedback-controlling the output from the voltage divider 29.

On the other hand, the bypass diodes 16 and 26 prevent an overvoltage higher than the output voltage of the rectifiers 13 and 23 from being applied to the tetrode vacuum tubes 18 and 28 when the first positive electrode 8b, the second positive electrode 8c, and the ground electrode 8e are completely short-circuited. It is intended to be protected as such. Also at this time, the tetrode vacuum tubes 18 and 28 detect a load short circuit and are quickly turned off to cut off the fault current. Note that the arc chamber 8a and the negative electrode 8
d requires separate power supplies, but their explanation will be omitted here.

By the way, the tetrode vacuum tubes conventionally used in this type of charged particle acceleration power supply device are specially developed for high power, and are extremely expensive and have a short lifespan of several thousand hours. Therefore, the production cost and operating cost of this type of power supply device have increased. The 20 tetrode vacuum tube has stable output voltage, low ripple,
However, as the purpose of use of this type of power supply device shifts from investigating load characteristics to simply extracting charged particles, the stability of the output of this type of power supply device is becoming increasingly important. Required specifications are becoming more relaxed in terms of performance, low ripple performance, and high-speed on/off capability. At the same time, demands for reducing system costs are increasing. Therefore, it is desirable to configure the system without using this tetrode vacuum tube and at a low cost.

(Problems to be Solved by the Invention) As described above, the conventional charged particle acceleration power supply device uses a tetrode vacuum tube, which has the problems of high cost and limited lifespan.

Therefore, the present invention has a semi-permanent lifespan, and
The purpose of this invention is to provide a more economical charged particle acceleration power supply in anticipation of higher voltages in this type of power supply in the future.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, the present invention includes a rectifier that converts alternating current into direct current, and an inverter that converts the direct current output of this rectifier into high-frequency alternating current that is higher than the frequency of the aforementioned alternating current. , a transformer that changes the inverter output voltage, a rectifier that changes the output of the transformer into direct current, and a short circuit device that is connected in parallel to the load in the output circuit of the rectifier.

(Function) In the charged particle acceleration power supply device having such a configuration, the rectifier and the inverter constitute a frequency conversion device for the input power source, and the frequency of the inverter output is usually converted to a frequency higher than that of the input power source. At the same time, the inverter output voltage is controlled to keep the rectifier DC output voltage constant. This allows the stability, low ripple, and fast on/off capability of this type of power supply output to be controlled within the required specifications.

The short-circuit device short-circuits the rectifier output terminal when the inverter output is off to prevent unnecessary voltage from being applied to the load.

In other words, the present invention realizes the constant voltage control function and high-speed on/off function of the tetrode vacuum tube described above using an inverter, and largely eliminates the DC circuit on the output side of the rectifier.

(Embodiments) Hereinafter, embodiments of the present invention based on the above-mentioned idea will be described with reference to the drawings.

FIG. 1 shows an example of the configuration of a charged particle acceleration power supply device according to the present invention. That is, in FIG. 1, 1 is a rectifier, 2 is an inverter, 3 is a transformer, 4 is a rectifier, and 5 is a rectifier.
6 is a short circuit device, and 6 is a two-point input load having a detailed structure similar to 88 to 8e in FIG.

In the charged particle acceleration power supply device configured as described above,
The inverter 2 is controlled to output an alternating current having a frequency higher than the frequency of the input power source of the rectifier 1, and is also controlled to keep the output voltage of the rectifier 4 constant. In addition, if a short circuit occurs in the load 6 while the rectifier 4 is outputting, the inverter 2 detects a change in the output voltage or output current of the rectifier 4 and controls the inverter output to be turned off at high speed. be done. The short circuit device 5 connects the inverter 2
It is operated so as not to apply unnecessary voltage to the load 6 when the output of the load 6 is off.

Therefore, since the charged particle acceleration power supply device can be constructed from relatively inexpensive semiconductor devices without using a conventional tetrode vacuum tube, it can have a semi-permanent life, and the circuit on the output side of the rectifier 4 Since it is possible to eliminate a large amount of information, it is possible to construct an extremely economical system.

Note that the present invention is not limited to the embodiments described above, but can also be implemented as follows.

(a) FIG. 2 shows another embodiment of the charged particle acceleration power supply device according to the present invention, and the same parts as in FIG. Now, I will only discuss the different parts. In other words, Figure 2 is the same as Figure 1.
This shows a case where the short circuit device 5 in the figure is replaced with a resistor 7.

In this case, the resistor 7 quickly discharges the residual voltage caused by space charge etc. from the moment the inverter output is turned off, and acts to prevent unnecessary voltage from being applied to the load 6. , the system can be configured economically.

(b) FIG. 3 shows another embodiment of the charged particle acceleration power supply device according to the present invention, and the same parts as in FIG. Now, I will only discuss the different parts. In other words, Figure 3 is the same as Figure 1.
Another set of the rectifying device 1 to the shorting device 5 shown in the figure is provided, and the part numbers shown in FIG. 1 having the same functions are indicated by adding a dash. At this time, one end of the rectifier 4 is
At the same time, 8a to 8 shown in FIG.
This configuration is also connected to a load 8 having the same structure as e. If the number of load input terminals increases, the third
By configuring the system as shown in the embodiment shown in the figure, a more economical system can be constructed as in the case of FIG.

(C) In FIG. 1, by configuring the inverter 2 with a self-extinguishing semiconductor such as a GTO thyristor, the output of the inverter 2 can be faster than in the embodiment shown in FIG. An economical system can be constructed similar to the described embodiment.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to provide a charged particle acceleration power supply device that has a semi-permanent life and is more economical even when the voltage of this type of power supply device is increased in the future.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the charged particle acceleration power supply device according to the present invention, and FIGS. 2 and 3 are block diagrams showing other embodiments of the charged particle acceleration power supply device according to the present invention. FIG. 4 is a configuration diagram showing a conventional charged particle acceleration power supply device. 1.1'... Rectifier r1 2.2'... Inverter 3. 3'... Transformer 4, 4'... Rectifier 5.
5'...Short circuit device 6,8...Load agent Patent attorney Noriyuki Chika Ken Yudo Daishimaru Ken Figure 3

Claims (3)

[Claims] (1) A rectifier that converts alternating current into direct current; an inverter that converts the direct current output of this rectifier into high-frequency alternating current that is higher than the frequency of the alternating current; a transformer that changes the output voltage of this inverter; and a transformer that changes the output voltage of this transformer into direct current. 1. A power supply device for accelerating charged particles, comprising: a rectifier for converting the voltage into a rectifier; and a short-circuit device connected in parallel with a load in an output circuit of the rectifier. (2) The charged particle acceleration power supply device according to claim (1), characterized in that the short circuit device is replaced by a resistor. (3) Claim No. 1 (1) characterized in that the inverter is constructed of a self-extinguishing semiconductor such as a GTO thyristor.
) A power supply device for accelerating charged particles as described in item 2.