JPS6176071A - Power source for neutral particle incident device - Google Patents

Abstract

PURPOSE:To simplify an accessory control circuit by composing a plurality of high speed switches which open or close the output current of a rectifier of a vacuum tube and a gate turn-OFF thyristor (GTO), thereby reducing a device withstand voltage. CONSTITUTION:A basic circuit which has rectifiers 1, 7, and high speed switches 10, 14 is connected in two-stage cascade, and a DC power source for a neutral particle incident device for generator two type of DC voltages of different amplitudes. In this case, the one high speed switch 10 of the basic circuit is composed of a tetrode vacuum tube, and the other switch 13 is composed of a GTO. Thus, the DC voltage generated from the rectifier 1 is controlled to be switched by the GTO13, and superposed on a DC voltage generated by the rectifier 7. Further, the superposed voltage is controlled to be switched by the tetrode tube 10, and controlled to be fed back by a DC voltage divider 14, and held at the constant voltage. The output voltage is divided by resistors 15, 16, and output from the DC output terminals P1, P2.

Description

[Detailed Description of the Invention] [Field of the Invention] The present invention relates to a power supply device for a neutral particle injection device (hereinafter referred to as NBI) used in a nuclear fusion device, and the present invention relates to a power supply device for a neutral particle injection device (hereinafter referred to as NBI) used in a nuclear fusion device. The present invention relates to a power supply device for a neutral particle injection device with improved performance.

[The technical background of the invention and its problems]

Conventionally, a high-voltage DC power supply has been adopted as an NBI power supply used in a nuclear fusion device.

FIG. 1 shows the main circuit configuration of this type of power supply device. In the figure, 1 is a rectifier that converts AC power obtained through a transformer 2 into DC, 3 is a DC filter capacitor, and 4 is a high-speed switch that turns on and off the output current of the rectifier 1. is supplied to a beam extraction electrode of an ion source (not shown) as a load through output terminals PJ and N. Further, 5 is a DC voltage divider. In addition, as the high-speed switch 4 mentioned above, a high-power tetrode vacuum tube is used.

In this power supply device, the DC voltage generated by the rectifier 1 is turned on and off by a high-speed switch 4 made of a tetrode vacuum tube, and at the same time is maintained at a constant voltage by feedback control of the output of a DC voltage divider 5 to the high-speed switch 4. dripping

By the way, in the above power supply device, the high speed switch 4
As such, it uses a patented high-power co-air tube that features high-speed control. On the other hand, in the future, if the voltage of NBI is increased to about 200 V, it will be necessary to have two or more types of DC high voltage output with different diameters, and the 4-pole I3C hollow tube will also have a high voltage of 200 V. Things are watered down. However, since there is no single vacuum tube with a dielectric strength of 200 KV or more as a quadrole hollow tube, it is necessary to develop a new one or adopt another circuit system.

In this case, there is almost no benefit in developing the X2 tube, so it is conceivable to adopt another circuit system.

FIG. 2 shows an example of the configuration of a power supply device using this method.
It's a thing. In other words, this circuit is a two-stage cascade connection of the same basic circuit as shown in Fig. 1, with rectifier 1,
7, Transformer 2, 8, DC filter condenser f3.9,
High speed switch 4, 10. It is constructed from a DC voltage divider 5.11 and a diode 6.12 as shown.

In such a ttS device, the voltage at the DC output terminal P1 is controlled by the high speed switch 4 of the tetrode vacuum tube, and the voltage at the DC output terminal P2 is controlled by the high speed switch IQ of the tetrode vacuum tube. According to this method, as the DC output voltage increases, a large number of quadrupole poles are required, but the use of a large number of vacuum tubes causes several problems.

In other words, vacuum tubes have more complicated attached control circuits than half-body switches, and the acid drop during load is large, requiring cooling equipment for the electrodes. It becomes necessary to increase the withstand voltage and also to increase the power receiving capacity.

[Purpose of the invention]

The present invention was made in view of the above-mentioned problems, and its purpose is to reduce the withstand voltage of the device and simplify the attached control circuit, thereby creating an economical and highly reliable power source for the neutral particle injection device. The goal is to provide equipment.

[Summary of the invention]

In order to achieve the above object, the present invention uses a rectifier and a rectifier. c.
In a 'rM, σN arrangement in which basic circuits consisting of 8 pick-up switches are connected in multiple stages in cascade, the high-speed switch of at least one basic circuit is constructed from a vacuum tube, and the high-speed switches of the other basic circuits are constructed using a gate turn-off thyristor (hereinafter referred to as GTO). χ characteristics.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention shown in the drawings will be described.

FIG. 3 shows an example of the main circuit configuration of a power supply device for a neutral particle injection device according to the present invention. In the figure, the same parts as in FIG. Now, I will only discuss the different parts.

That is, in FIG. 3, a high-speed switch is constructed from the GTO 13 in place of the quadrupole hollow tube 4 in FIG. 2.

Further, in the figure, "'CI4" indicates a DC voltage divider, and 15.16 indicates a voltage dividing resistor.

In the thus constructed power supply device, the DC voltage generated by the rectifier 1 is controlled by the GT:O13, and the DC voltage generated by the rectifier 7 is M't, 1ti,
Pressure KM is folded. The voltage obtained by superimposing these two DC voltages is carefully controlled by a high-speed switch 10 consisting of four vacuum tubes, and at the same time is kept at a constant voltage by feedback control of the output of the DC voltage divider 14 to the high-speed switch 10. It will be done.

Then, high-speed switch 1 is connected by voltage dividing resistor 15.16.
The output voltage of 0 is divided and DC voltage outputs of different magnitudes are output to each DC output terminal PI.

Occurs from P2. In addition, when the DC output terminal P2 is short-circuited with the low voltage 1llllI terminal N, the diode 6.12
In order to prevent the voltage at the DC output terminal P2 from being applied to the high speed switch 10, the voltage generated by the 'Jlk device 1.7 is bypassed.

In this way, in a DC power supply device for a neutral particle injection device, which consists of a two-stage cascade connection of basic circuits consisting of a rectifier and a high-speed switch, and generates two types of DC voltages with different magnitudes, one basic circuit The high-speed switch 10 of the circuit is constructed from a tetrode vacuum tube, and the cylinder speed switch 13 of the other basic circuit is constructed from a GTO.

Therefore, since the GTO can be used as a high-speed switch in place of the 4-pole hollow tube, the attached control circuit can be simplified, the cooling equipment can be made smaller, and the voltage drop can be reduced. .

1.(It is possible to reduce the load capacity and weight of the power receiving capacity as well as to reduce the pressure resistance of the device.Also, because 4 ugly vacuum tubes are used in some parts, the heavy pressure of the 1 outflow output is reduced. Therefore, from the above, it is possible to simplify and improve economical efficiency without deteriorating the performance of ℃, and it is a highly reliable device that can be used. It is.

It should be noted that the present invention is not limited to the above embodiments, and can also be carried out at temperatures as follows.

(1) As shown in Figure 4, GTO13 in Figure 3
Alternatively, the current limiting resistor 17 and the GTO 18 may be used.

(2) In the above description, the basic circuit consisting of the rectifier and the high-speed switch is connected in two stages in cascade, but it goes without saying that three or more stages of multi-ridge connections may be used. Further, in this case, the high-speed switch of at least one of the plurality of basic circuits is constructed from a vacuum tube.

(3) In the above, a tetrode vacuum tube was used, but other vacuum tubes may also be used.

In addition, the present invention can be implemented with various modifications without changing the gist thereof.

〔Effect of the invention〕

As explained above, according to the present invention, at least one of the plurality of high-speed switches for turning on and off the output current of the rectifier is made up of a vacuum tube, and the rest are made up of conductor switches such as GTO. By reducing the device withstand voltage and simplifying the attached circuit, it is possible to provide an extremely economical and highly reliable power supply device for a neutral particle injection device.

[Brief explanation of the drawing]

1 and 2 show the components of a conventional power supply device for a neutral particle injection device, and FIGS. 3 and 4 show one embodiment and another embodiment of the present invention. 1.7... Rectifier, 2,8... Transformer, 3,9.
...Condenser, 4.10...Tedriode telescope, 5°11
．． 14... direct flame voltage divider, 6.12... diode,
13. Ill...GTO, l5, 16... Voltage dividing resistor, 17... Current limiting resistor. Applicant's representative Patent attorney Takehiko Suzue Figure 1 Figure 2

Claims (1)

[Claims] A DC power supply device that generates multiple DC voltages of different magnitudes by cascading a basic circuit consisting of a rectifier that converts alternating current to direct current and a high-speed switch that turns on and off the output current of this rectifier. A power supply device for a neutral particle injection device, characterized in that the high-speed switch of at least one of the basic circuits is composed of a vacuum tube, and the high-speed switches of the remaining basic circuits are composed of gate turn-off thyristors.