JPS5941181A - Particle accelerating power source - Google Patents

Abstract

PURPOSE:To improve the reliability and the economy of a particle accelerating power source by controlling a DC high voltage applied to a load through an AC thyristor switch and supplying the DC high voltage to a load via a GTO. CONSTITUTION:The rectified voltage by a rectifier 4 is supplied to a load 11 through a DC reactor 5A. A rectifying diode 6A is connected in parallel with the reactor 5A in a direction for blocking the DC high voltage rectified and in series with a variable resistor 7A. A GTO 8A is connected in parallel with the load 11. The detected voltage by a DC voltage detector 9 connected in parallel with the load 11 is transmitted to a controller 10A, thereby controlling an AC thyristor switch 2.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This theory relates to a particle acceleration power supply device used in a neutral particle injection device of a nuclear fusion device, etc. [Prior Art] A particle acceleration power supply device is a plasma generator. This is a high-voltage DC source device for accelerating and neutralizing ions in a gas, and for adding ions to other plasmas.

The accelerating power source constitutes the main wall portion of this particle accelerating power source device.

FIG. 1 shows the circuit of a typical particle acceleration power supply device used in the past.

The AC power supply is cut off by the AC thyristor switch 2VCgfff for suppressing the faulty power supply through the AC 1IIll cutoff-quick 1 switch. The firing angle is controlled by the thyristor switch 2 F'
The AC power supply is connected to a diode rectifier 4 via an isolation transformer.
is supplied to and rectified. The rectifier 4vc has a capacitor 5 and a resistor 6 connected in series and connected in parallel.

The capacitor 5 is used to suppress the rectified voltage ripple voltage and accelerate the rise of the current to the load, and the resistor 46
The rectifier 4 is used to prevent vibration of the rectified voltage.Furthermore, a short-circuit thyristor switch 7 is connected in parallel to the rectifier 4 to cut off the N'-current voltage to the load. Rectifier 4
The rectified voltage is high 1 to negative through the vacuum tube 8
``I will meet you.''

The high-voltage vacuum tube 8 has constant (If, pressure control lII and 1)9 function to cut off the current supplied to the load when the load 11 is abnormal.〇The load 11 has a DC 111 pressure detector in parallel with it. The control image 1110 detects the DC voltage applied to the load 11 and outputs a high voltage A'F2 of the control image 1110.
We control every single production.

Such a power supply device differs from a conventional general constant-pressure power source in that it has the following features.

That is, by controlling the high-voltage vacuum tube 8 or by providing the capacitor 5, the DC voltage supplied to the load 11 can be maintained at a low ripple level.

Also, by turning on and off the crystal pressure vacuum blue 80, it is possible to apply a heavy pressure to the load 11 that rises and falls extremely quickly (several tens of microseconds).

Further, since the load 11 is an ion source, short circuits occur frequently, but when the load 11 is short-circuited, the high voltage vacuum tube 8 can interrupt the fault current.

However, in some cases it may fail to interrupt the fault current, so in that case, the short-circuiting thyristor switch 7 is activated to short-circuit the load 11 to maintain the iodine source, and at the same time, the AC thyristor switch 2 is activated. The gate is blocked within one cycle and the entire tKm device is struck to a halt.

[Problems with conventional technology]

However, the conventional power supply device shown in FIG. 1 has the following drawbacks.

1-In other words, in the high-voltage vacuum tube 8, the life of the filament inside the vacuum tube is short, about 2000 hours at most, and maintenance is frequent and expensive, and flashover (short circuit) inside the vacuum tube is likely to occur. : The reliability of the source equipment is poor.

Moreover, when this flashover occurs, it is necessary to operate the short-circuit thyristor switch 7 to protect the ion source, which is the load 11, and the number of operations of the thyristor switch 7 also depends on the number of times the thyristor switch 7 is operated. This has the disadvantage that it affects the short circuit resistance of the diode rectifier 4 and makes each device expensive.

[Purpose of the invention]

The object of the present invention is to provide a particle acceleration +41 original device that can solve these problems and also improve the reliability and economical efficiency of the power supply device.

[Summary of the invention]

In order to achieve the above object, the present invention provides a particle acceleration power supply device 1 that connects an AC power source to a rectifier via an AC thyristor switch and supplies a step-up rectified DC high voltage to a load.
In the above, the DU recorder 1i! of the DC high voltage is connected in series to one end of the II current transformer. a DC reactor provided in the transmission path of I, a rectifier diode connected in series with a variable resistor and connected in parallel to the DC reactor in a direction to block the DC crystal pressure described in 11J, and a rectifier diode connected in parallel to the DC reactor; and a gate turn-off thyristor connected thereto, the DC high voltage applied to the load is controlled via the AC thyristor switch, and the gate turn-off thyristor supplies the DC high voltage to the load. It is characterized by

Embodiments of the Invention FIG. 2 is a circuit diagram of a power supply device showing an embodiment of the invention.

Note that the same parts as shown in 11th C.4 are given the same reference numerals and explanations are omitted.

The rectified voltage by the rectifier 4 is supplied to the load 11K via the 11-current reactor 5A.

Further, a rectifier diode 6A is connected in parallel to the DC reactor 5A in a direction to block the rectified DC high voltage and connected in iMi rows to the variable resistor 7A.

In addition, the load 11 is connected in parallel with a gate turn-off thyristor (
8A (hereinafter referred to as GTO) is connected and investigated - Load 1
The voltage detected by the DC heavy pressure detector 9 connected in parallel to K1. c, i.e. the second
In the IIjl circuit of the embodiment shown in the figure, the AC thyristor switch 2 has the control function of the high voltage vacuum 178 in the conventional circuit shown in Fig. The short-circuit thyristor switch 7, which was previously included, is omitted.

In place of this thyristor switch 7, use KGTO8A as the load 1
1vc is connected in parallel, and power is supplied to the load 11 by this on/off capability.

Next, the operation of this circuit will be explained. First, at startup, the GTOBA 4 is short-circuited, the AC thyristor switch 2 is turned on, and the rated current is circulated through the DC reactor 5A by creating a short circuit.

Next, when the time comes to supply current to the load 11, the GTO
8A is turned off and the current flowing through the DC reactor 5A is immediately supplied to the load 1IVc - 0 Therefore, GTO8
It is possible to freely control the supply and stop of current to the load 11 by turning on and off A.However, sufficient performance cannot be achieved by such operation alone. In other words, it is necessary to add functions that realize constant voltage, low ripple control and generation of a voltage that rises quickly, which was achieved using a high-voltage vacuum tube 8 in the conventional power supply device shown in Figure 1. No 0 In this invention, a circuit for Qgo is added.

That is, as shown in Fig. 2, the AC thyristor switch 2
And the DC reactor 5A performs constant 'M pressure and low ripple control, and the load 11 when the load 11 is short-circuited.
This is done by turning on yal'GTO8A.

Further, the DC reactor 5A has the role of supplying a steeply rising current to the load 11 when the GTO 8A is turned off.

However, what must be noted here is that the load 11
If the GTO 8A turns off too rapidly, the voltage applied to the GTO 8A may become excessive due to the stored energy in the DC reactor 5A.

Therefore, a rectifier diode 6A and a variable resistor 7A are provided to adjust this rise time.

The rectifier diode 6A bypasses @flow 11 accelerator 5A during steady state and is connected to the variable resistor 8a? It is placed in a direction that blocks high DC pressure so that no current flows through A.

The variable resistor 7A is used to adjust the rise time to an appropriate level since the voltage applied to the load 11 is uncertain due to the off function of the GTO 8A, circuit constants, etc.

Of course, to adjust the rise time of the load voltage, use the GT
Another option is to connect a capacitor, resistor IT, etc. in parallel with O8AK, but in this case, the load voltage is continuously applied, so the ratings of the capacitor and resistor will be stricter, and the loss of one member will increase. Therefore, it cannot be said to be a preferable method.

In this way, the embodiment 0 shown in FIG. 2 not only has the same functions as the conventional power supply device shown in FIG. Overall reliability is improved, and an inexpensive and economical power supply device can be realized.

〔Effect of the invention〕

Above are the examples! As explained in detail below, the present invention adopts a 1-to-1 path configuration that allows the omission of high-voltage vacuum tubes with poor reliability; Since the frequent operation of the thyristor switch due to flashover in the vacuum tube is eliminated, there is no need to increase the short-circuit limit of each device used in the power source device, making it possible to construct an inexpensive and economical power supply device. It has the advantage of being possible.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an example of a conventional particle acceleration power supply device,
FIG. 2 is a circuit diagram showing an embodiment of the present invention.

Claims (1)

[Claims] In a particle acceleration power supply device that connects an AC power source to a rectifier via an AC thyristor switch and supplies step-up and rectified DC high voltage to negative Nj, the AC power source is connected in series to one end of the rectifier and transmits the DC high voltage to the load. a rectifier diode connected in series with a variable resistor and connected in parallel to the DC reactor in a direction to block the high voltage of the 111 current, and a rectifier diode connected in parallel to the load; A gate turn-off thyristor is provided, and the DC high voltage applied to the rA nri is
1. A particle acceleration power supply device controlled via a father-flow thyristor switch, wherein the gate turn-off thyristor supplies the DC voltage (nII) to the negative voltage (+'ii).