JPS61180579A - Power source for nuclear fusion reactor - Google Patents

Abstract

PURPOSE:To improve the current flowing capacity and to reduce the size by providing a large power switch in parallel with a switching element such as an ignitron or a thyristor. CONSTITUTION:A rising capacitor 2 is connected through the first switch 20 with a load coil 8. A series circuit of a crowbar diode 5 and a discharging time limiting resistor 6 is connected in parallel with a flat top capacitor 3, and a circuit thus formed is connected through the second switch 21 with the coil 8. Large power switches 101, 101A are respectively connected in parallel with the switch 21 and the capacitor 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a power supply device for a nuclear fusion device, and particularly uses a capacitor or the like. The present invention relates to a power supply device for a nuclear fusion device that generates a relatively high voltage and has improved current carrying capacity.

[Conventional technology]

Conventionally, there has been a device of this type having the configuration shown in FIG. This is used as a power source for toroidal coils or poloidal coils in axially symmetrical torus-type experimental equipment.

In this work, we will use nuclear fusion devices, especially reversing magnetic field pinch devices (RE).
The case of the power supply device used in P device i) will be explained as an example.

In this Fig. 9, (1) is the power supply device, (, 21 is the fast circuit start-up capacitor Cr, (j)
is the flat top capacitor Cf as a slow circuit,
(p) is the flat top diode Dl, (j) is the crowbar diode D2. (6) is the discharge time limiting resistor R1 (ri), which is a main switch made of, for example, ignitron If, and (6) is the load coil L.

In such a conventional device, the rise capacitor Cr (21) and the flat top capacitor Cf (31) are each charged to a predetermined voltage by a charger (not shown). Here, by applying a trigger signal to the ignitron I y (71) from an ignition circuit (not shown), this ignitron E f is ignited. Current flow from Cr(,2) begins to flow into the load coil L (g). Figure 5 shows a time-current flow diagram illustrating how such current flow changes over time.
This is a relationship diagram of load current, and the explanation will be continued below with reference to FIG. 5 as well. When this electric current flows to a certain extent,
When the voltage of the rising capacitor Cr (J) decreases and becomes equal to the voltage of the flat top capacitor Ct (J), the flat top diode D t ('I
) turns ON, current from this flat top capacitor Cr (Jl) is applied through the flat top diode Dl (4'), and the load coil L (
ff). This state is shown at time tl in FIG. Flat top capacitor Ct (
, 7) is made large, and the flow capacity continues to increase gradually thereafter, reaching a peak value 1o at one point in time t. At this time ta, the rising capacitor Cr
(ul and flat top capacitor Ct (,7
The voltage of 1 is 0voit. After this time tλ, the capacitor for rising Cr (-2) and the capacitor for the bird rat top Cr
[, Although the current from 71 disappears, the clover
The diode Ds (!r) is turned ON, and the load is applied through the discharge time limiting resistor R (61, the crowbar diode Dco(t), the 7-array breeding diode Dt(φ), and the ignitron Ip(7)). The current in the coil L is crowbared, and the current flowing through the load coil L continues to flow while gradually decreasing by 1. At this time.

The discharge time cannot be very long due to the capacities of the flat top diode Dt, the crowbar diode Dco, and the ignitron If, so the discharge time limiting resistor R(6) This allows the crowbar current to drop quickly.

[Problem that the invention seeks to solve]

In conventional devices of this type, as mentioned above, the crowbar current to the load coil is quickly reduced by the diode used and the capacitance of the ignitron as the main switch, but this is due to the plasma There was a problem in that the generation time was shortened, which was a decisive disadvantage in obtaining a long plasma confinement time.

Further, the ignitron used as the main switch in this type of device has a small current capacity due to its structural limitations, and even a large one has a current capacity of about 100 coulombs at most.

In order to increase the current capacity after time t in FIG. 3, it is necessary to connect multiple ignitrons in parallel.7 For example, when used as a power supply device for an RF'P device, Approximately 10 ignitrons must be connected in parallel, and if the device is not large-scale, even more ignitrons are required. In such a case, a large number of six-edge gate circuits and DC electric wires are required, which increases the cost and increases the size of the circuit.

There was a problem in that safety was also a problem. Also, it was considered to use an SCR as the main switch, but since the voltage of the capacitor in one circuit is high, it was necessary to use several SCRs in series and then in parallel. There was an economic problem in that the equipment was not cheap.

This invention was made in order to solve the above-mentioned problems in conventional devices of this type, and by inserting a high power input device in parallel with a switching element lacking in capacity, the cost can be reduced. The object of the present invention is to provide a power supply device for a nuclear fusion device that can compensate for the insufficient capacity without increasing the power supply capacity.

[Means for solving problems]

In the power supply device for a nuclear fusion device according to the present invention, a start-up capacitor is connected to a load coil through a first switch, and a flat top capacitor and a predetermined crowbar circuit are connected in parallel to each other. The load coil is connected to the load coil through a switch, and a large power input device is connected in parallel to each of the crowbar circuit and the second switch.

[For Kui]

According to this invention, since a large power input device is inserted in parallel with a general switching element, the insufficient capacity of the switching element is supplemented.

〔Example〕

Figure 1 is for a nuclear fusion device, which is the first embodiment of this invention! #This is a configuration diagram of the device, and the same reference numerals as in FIG. 9 indicate the same or corresponding parts. And this g1
In the figure, the ignitron I y (71
and a flat top diode D/(<41), a first switch 8CPt (θ) and a second switch 5CRI (λ/) are used, respectively. Also, a large power input device 5Wt( toi) and SW2 (to
t*) is connected in parallel with the former 5CRJ (21), and the latter is connected in series with the crowbar diode Dafjl and the discharge time limiting resistor R (6).

The operation of the apparatus according to the first embodiment of the present invention shown in FIG. 1 will be explained with reference to the time-load current relationship diagram shown in FIG. 5. First.

At the timing of t=0, SCR/(λQ) is O
It is set to N and energization is started. At time 1 = 11, the voltage of the rising capacitor Cr (A) and the voltage of the flat top capacitor Ct (, ?l become equal,
SCR (2t) is also turned ON. Next, at some point in the time period from tt to ta, the high power turn-on device BWi (10/) is turned on with a power-on accuracy of ±0.35 ff1 second. Incidentally, since the above-mentioned time period from tl to ta is approximately 1 msec or more, the above-mentioned input accuracy is sufficient. Next, one point in time t
At =tJ, the voltage of the rise capacitor CrL2) and the flat top capacitor Cf(3) is 'l
OvoJ,t is reached, and the crowbar diode Dco (5) is turned on at this point, resulting in crowbar operation. From this point on, the large power input switch (lOIA) is turned on, and the crowbar diode D
Most of the wealth and flow that was flowing to Ko (3) will now flow to this large power input device 5WJ (10/k). and,
At this time, the clover hour lasted for more than 99 milliseconds.

The high power input switch SW (10/k) is also ±0.31rI
A charging accuracy of about L seconds is sufficient. Moreover, its current carrying capacity exceeds too many coulombs.

This point is also sufficient.

Furthermore, since the turning-on time accuracy of ignitrons, thyristors, etc. used as so-called main switches is on the order of microseconds, the timing for starting discharge is determined by this main switch, and the time point t=12 in FIG. Thereafter, sufficiently accurate operation is achieved by turning on the high power input device with a closing time accuracy of ±0.33 msec and crowbar. This reduces the resistance for limiting discharge time.

A discharge waveform as shown by the dotted line in FIG. S is obtained.

Next, what is shown in FIG. 2 is a block diagram of a large power input device suitably used in the embodiment of the present invention. In this Figure 2, (iot) is a large power input device, (lOko), (io3) is a terminal, (IO Hiro).

(ioyo) is the contact support member, (106)l()0
ri) is a fixed contact, (toe) is a movable contact.

(10d) is a tank, and this tank (lθd) accommodates a fixed contact ('OA) + (/or) and a movable contact (10g), and also includes a contact support member (tcp), ( 10s) is this tank (i
ot). The main circuit current path of this large power input device (101) consists of terminals (10), contact support members (to9Ld), fixed contacts (10/
s).

Movable contact (10r), fixed contact (iot)
.

It consists of a contact support member (10g) and a terminal (io3), which are energized in this order.

Also, (ti□) is a movable contact assembly.

(lll) is the cylinder, (//1) is the piston, (tt
J) is a spring, (ttq) is a control valve, (tls) is a closing solenoid valve, (ti6) is a piston, (ttq) is an auxiliary switch operation cylinder, and (//za) is a piston.

(it9) is the auxiliary switch, and (tao) is the compressed air source.

(t2t) is a trip solenoid valve, (122) is a rubber spring, and (lco3) is an operating valve.

The large power input device (toi
), the movable contact assembly (11O) moves to the right side of the figure, and the fixed contacts (106), (102) and the movable contact (10t) are cut off. In addition, the tank (toq) is applied with a predetermined air pressure (for example, 1okp/cd) from the compressed air source (l-〇),
The control valve (//I) is in the closed state.

Equal pressure will be applied to both sides of the piston (tis). And the piston (//, 1
) is pushed all the way to the right in the figure by the force of the spring (ttS), and the movable contact assembly (ii
θ) is moved to the right and the fixed contact (tab)
, (to7) and the movable contact (iot) are kept open. On the other hand, the control valve (ti41
) is opened, the left side of the piston (//ko) is opened to atmospheric pressure, so that said piston (ttJ) is pushed by the air pressure of the tank (1o9) and moves into the movable contact assembly (tt □) moves to the left, and the fixed contact (t
A closed BK is formed between the ab), (tori) and the movable contact (10g).

Now, the large power input device (lO7) in Fig. 2 is in a cutoff state, and when a predetermined input No. 11 is input to it, the input overturning current related to the input control valve (IT3) flows. This input ti valve (ttS) opens and compressed air is sent to the control valve (77%) side, and the piston (ttb)
is pushed to the right, the control valve (l/II) is discharged, and the piston (toy') is moved by the air pressure in the tank (toy').
it2) is moved to the left and the movable contact assembly (t
iθ) is caused to reach the closed position.

On the other hand, regarding the auxiliary switch operation cylinder (11), the piston (ti
When the piston (itz) is operated, the closing signal is turned off by an auxiliary switch (t/9) mechanically linked to the piston (itz), and the closing solenoid valve (itz) is closed. At this time, the control valve (ttq) is continuously held due to its self-holding function, and the fixed contacts (lO6), (lQ
The contact pressure between the contact (totr') and the movable contact (totr') is maintained at the required level by the air pressure in the tank (lO9). Note that the trip solenoid valve (l) remains closed.

The high power supply device configured and operated as described above can supply high voltage and large current at accurate timing. This is a long-life, low-cost switch.

In addition, this high-current closing device has a contact section enclosed in a high-pressure tank using compressed air, and the compressed air pressure operates the related control valve to drive the opening and closing of the contact section, thereby eliminating variations in closing time. This is a reduced closing switch.

And what about the contact part of this high power input device?

As mentioned above, since it is sealed inside a tank filled with compressed air, it is low noise.

Despite having a small contact spacing (e.g. 7 m), it is able to withstand high voltages (e.g. AC b o +cy). In addition, this high-current energizer has a control valve that improves the efficiency of air release especially when energizing, and its movable contacts are made lightweight, its movable distance is short, and By appropriately controlling the spring pressure at the time of contact contact, it is possible to achieve fairly accurate closing time accuracy (for example, ±0.J ms) with one mechanical contact.

Furthermore, this control valve has a self-holding function, and the closing solenoid valve and tripping solenoid valve that control the piston of this control valve are vented only at the start of operation.
Since it is held after the operation is completed, the amount of compressed air extinguishment can be reduced, and the capacity of the t-magnetic valve can be reduced.

Additionally, this control valve is directly connected to the operating valve.

By enlarging the exhaust port of the control valve, the exhaust resistance of the air in the operating valve is reduced and the air capacity in the operating valve is reduced.

FIG. 3 is a configuration diagram of a power supply device for a nuclear fusion device, which is the fourth embodiment of the present invention, and the same reference numerals as in FIG. 9 or FIG. 1 indicate the same or equivalent parts. .

And (2hiro) is a thyristor power supply, which is used in place of the flat top capacitor Cf (, 71) in the embodiment device shown in Figure 1. By doing this, the capacitor can be used. This allows for a longer time to send one letter than it would otherwise take.

In addition, in the implementation of the nestco array arrangement of the present invention shown in FIG.
), it becomes possible to increase the current that can pass through the law of
In addition, Taiichi, Power Thrower 5Wl (101) and SW Ko (
By inserting a reactor in series with 101*), it becomes possible to reduce arcing during chattering.

〔Effect of the invention〕

As explained above, according to the present invention, by providing a configuration in which a high power input device is provided in parallel with switching elements such as ignitrons and thyristors, the current carrying capacity is greatly improved, and the size is small. This has the effect of lowering costs.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a power supply device for a nuclear fusion device according to a first embodiment of the present invention, Fig. 2 is a block diagram of a high power input device used in the embodiment device of this invention, and Fig. , a configuration diagram of a device according to a third embodiment of the present invention. No. Hongu is the traditional version of this kind! ! Configuration diagram of the installation IEj diagram &t
It is a relationship diagram of 1 hour - load current. (1)・e Power supply device, -)・・Start-up capacitor. (3) Capacitor for flat top, diode for flat top (j) Diode for crowbar, (6) Resistor for limiting discharge time, (7) Ignitron, (1) ...Load coil, (0)...First switch, (2/)...Second switch, (O0)
・Thyristor power supply, (t□i), (totA)...High power input device. In each figure, the same reference numerals indicate the same or corresponding parts. Helmet 1 Diagram■ 1: Power supply device 2: Capacitor for rising 3: Capacitor for flat top 5: Diode for glover 6: Discharge straddle Wj limit kite shaft 8: Negative coil 20: First switch 21: Jl! , 2 switch tail 2 fig. 4 fig. 5 fig. ■ Procedural amendment (voluntary) Showa. 1. “556 days”

Claims (4)

[Claims] (1) A power supply device for energizing the load coil installed in the fusion device, in which the start-up capacitor is connected via the first switch, the flat top capacitor, the crowbar diode, and the discharge time limiting capacitor are connected via the first switch. A crowbar circuit consisting of a resistor is connected in parallel to the load coil through a second switch, and the crowbar circuit is connected in parallel with the second switch and in parallel with the crowbar circuit, respectively. A power supply device for a nuclear fusion device that contains a large power input device. (2) The power supply device for a nuclear fusion device according to claim 1, wherein the flat top capacitor is replaced with a thyristor power supply. (3) The power supply device for a nuclear fusion device according to claim 1, wherein a predetermined resistor is provided in series with the first switch. (4) The power supply device for a nuclear fusion device according to claim 1, wherein a reactor is provided in series with the high power input device.