JPS60207465A - Power source for nuclear fusion reactor - Google Patents

Abstract

PURPOSE:To reduce the size of a reactor without decreasing characteristics by providing a mutual inductance between two reactors of a ladder type pulse forming circuit. CONSTITUTION:Capacitors 2, 3a-3c of a power source are charged in advance in the polarity as shown, and a load coil 1 is excited to the set current by firing an ignitron 5. Then, an ignitron 6 is fired, a reverse voltage is applied to the ignitron 5 to be automatically closed to form a current path 7 to the coil 1, thereby maintaining the period of the time width T constant. In this case, mutual inductance values M are incorporated in reactors 41a, 41b. Thus, the first and second reactors are connected in series with the path 7 to perform the inductance effect, but the parasitic inductance of the capacitors 3b can be compensated due to the negative inductance effect corresponding to the value M for the path 8.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a nuclear fusion device, and particularly to a power supply device that supplies power to a magnetic field coil system for obtaining high temperature, high density plasma.

[Background of the invention]

Regarding this kind of conventionally known power supply device, the first
This will be explained based on FIG. FIG. 1 shows a magnetic field generated by a vertical magnetic field coil (hereinafter referred to as a load coil) in a reverse magnetic field pinch plasma apparatus, or a waveform of a current flowing through a load coil 1. In FIG. A power supply device for obtaining this waveform is shown in FIG. It basically consists of a ladder-shaped pulse shaping circuit (hereinafter abbreviated as PFN circuit) in which a reactor and a capacitor are connected. The part marked ■ in Figure 2 is the first
The figure is used for the period from time 0 to time t to initially excite this load coil, and the part marked ■ corresponds to time t in FIG. , and operates for a period of time T to create a positive flat top. In both of the parts (■) and (■), each capacitor 2, 38 to 3c is charged in advance to the polarity shown in FIG. 2, and the ignitron 5, which is the opening and closing means, is ignited at time t=0. This energizes this load coil to the set current. Subsequently, when the ignitron 6 is ignited, a reverse voltage is applied to the ignitron 5, the circuit is automatically closed, and the load coil current flows like the current path 7 shown in FIG. is maintained constant for a period of . Here, the PFN circuit glue, the second
Since 4a and 4b in the figure do not have a mutual salt-inducing effect, they must be arranged to avoid coupling of magnetic fluxes, which causes the problem that the device becomes large.

[Purpose of the invention]

An object of the present invention is to provide a power source for a nuclear fusion device whose installation volume can be reduced in size.

[Summary of the invention]

The present invention is characterized in that the reactor is miniaturized without degrading performance by providing mutual inductance between two actuators of the PFN circuit.

[Embodiments of the invention]

A specific embodiment of the present invention will be described based on FIG.

In FIG. 3, the reactors 4a and 4b in FIG. 2 are provided with mutual inductance. A reactor 41a is the core of the present invention.

41b will be mainly explained. Namely.

- As an example, it is assumed that the inductance value of the first and second glue axles is approximately 1/2 La, and that they are closely magnetically coupled to each other. Therefore, the mutual inductance value M is also approximately 1/2 La.

However, Ld is the reactor 4a in FIG.

This is the inductance value of 4b. In this way, the -
By providing a mutual inductance between the 1st and 2nd latitude axles, the 2nd and 2nd latitude axles are connected in series with the current path 7 in Fig. 2. However, for the current path 8, as shown in the equivalent circuit of FIG.

Due to the negative inductance effect corresponding to the phase magnetic inductance M, the parasitic inductance of the capacitor 3b can be compensated. Therefore, there is no need to particularly use an electrolytic capacitor with small parasitic inductance.

Note that the beam 1 in the figure is an acdle.

〔Effect of the invention〕

According to the present invention, the inductance of the reactor can be halved, and therefore the reactor itself can be downsized.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the time change of the magnetic field generated by the load coil or the current flowing through the load coil, Fig. 2 is a circuit diagram of a conventional device, Fig. 3 is a circuit diagram of an embodiment of the present invention, and Fig. 4 The figure is an equivalent circuit of FIG. 41a, 41b...Reactor. Agent Patent Attorney Akio Takahashi♀ 1 (2) 2nd Kuchiotsu J4S (2) Mu

Claims (1)

[Claims] 1. A first power supply for exciting a load coil current to a set value, and maintaining this current polarity for a set time. a second power source for maintaining the load coil current constant with set accuracy; a plurality of opening/closing means for operating the first power source and the second power source at the set time; In a power source constituted by a ladder-shaped pulse forming circuit formed by connecting a reactor and a capacitor, a means is provided for causing mutual induction between the n-role axle axle and the tilt axle axle at the (n+1) stage. A power source for nuclear fusion devices featuring: