JPH02135717A - Magnetic part for generating high-voltage pulse - Google Patents

Abstract

PURPOSE:To improve the ability of refrigerant by installing refrigerant passages to pass the refrigerant approximately countercurrently on both end faces of magnetic cores at a part of a separation means to separate the refrigerant flowing to both the end faces of the magnetic cores on the side faces thereof. CONSTITUTION:A central body 5 made of an insulator is equipped with magnetic cores 1a and 1b and refrigerant separation plates 2a and 2b made of an insulator to divide refrigerant 14 flowing to both the end faces of the magnetic cores are installed on the outer peripheral surfaces of each of the magnetic core. Partition plates 3a and 3b made of an insulator are installed between the magnetic cores 1a and 1b and on the magnetic core 1b. By refrigerant passages 4a, 4b, 4c, and 4d installed on the refrigerant introduction plates 2a and 2b and the partition plates 3a and 3b, the refrigerant 14 introduced through a refrigerant introduction port 10 is passed in the direction of the arrow, drained through a drain port 11, cooled by a heat exchanger, and returned to the introduction port 10 for circulation. Thereby sufficient cooling ability can be obtained.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to magnetic components for high voltage pulse generators used in discharge-excited lasers, accelerators, etc., and particularly used as step-up transformers and magnetic switches. The present invention relates to magnetic components for high voltage pulse generators.

[Prior Art] A high-voltage pulse generator used to excite gas lasers such as excimer lasers and copper vapor lasers includes, as described in Japanese Patent Application Laid-Open No. 186569/1983, etc.
A circuit combining a capacitor and a saturable reactor is formed on the high voltage side.

The basic configuration of the high voltage side of this circuit is shown in FIG.

On the low voltage side in FIG. 5, a repetition frequency of about several kHz is obtained by a switching element such as a thyristor, and is connected to the high voltage side via a step-up transformer (not shown). Capacitors 16, 17, 18 and saturable reactors 19, 2 in Fig. 5
0.21, the time width of the current input from the low voltage side is sequentially compressed and connected to the laser discharge electrode 15.

Such a circuit compresses the input current to about 1/100th of the time width, reducing the rate of increase of the current to 1ookA/μSec.
It was also possible to do more than that.

In this case, the saturable reactor plays the role of a magnetic switch that utilizes the change in inductance value between the unsaturated and saturated cores.

In other words, when the magnetic core is not saturated, only a small, gentle current flows through the saturable reactor, but when it is saturated, a current with a high peak width flows, causing losses such as hysteresis loss and eddy current loss in the winding core. occurs and generates fever.

Since magnetic switches use a magnetic flux density higher than the saturation magnetic flux density of the magnetic core, the amount of heat generated is much greater than when a magnetic core is used as a transformer or magnetic amplifier, and discharging this heat has been a major problem.

In particular, when an amorphous magnetic core is used, the operating temperature must be kept below 125° C., and cooling of the magnetic core is essential.

Because of these problems, magnetic cores are cooled using refrigerants, but in order to further improve cooling efficiency, Japanese Patent Laid-Open No. 63
There is known a device in which a spacer is wound inside a wound magnetic core to allow a refrigerant to pass therethrough, as described in Japanese Patent No. 211608.

[Problems to be Solved by the Present Invention] In the above-mentioned wound magnetic core having a spacer inside it, the shape of the magnetic core becomes large due to the spacer, and since the spacer is involved, the magnetic properties deteriorate due to the influence of magnetostriction. There was a drawback that the space factor decreased and the inductance after the b magnetic core was saturated increased.

Further, when a wound core is used as the magnetic core, a wound core formed by simultaneously winding an insulating film is used because it can reduce overcurrent loss and the like.

In this case, since the thermal conductivity of the insulating film is significantly lower than that of the magnetic core, heat transfer in the radial direction of the wound magnetic core is inhibited.

The present inventors discovered that it is important to cool both end faces of the magnetic core in order to cool the above-mentioned magnetic core, and filed a patent application in 1986.
No. 3-142425 includes an insulated guide as a magnetic component to uniformly cool the end face of the magnetic core, and a flow path is formed on each end face of the magnetic core so that the cooling medium flows from the center to the outer periphery or from the outer periphery to the center. I submitted what I did.

However, even with such a magnetic core component, the cooling ability of the magnetic core is insufficient, resulting in a problem that the peak value of the output current of the high voltage pulse generator gradually decreases.

An object of the present invention is to provide a high-voltage pulse generating magnetic component having a structure with better cooling capacity than conventional magnetic core components.

[Means for Solving the Problems] The present invention provides a magnetic component for a high-voltage pulse generator in which a magnetic core is installed in a refrigerant. A magnetic component for generating high voltage pulses, characterized in that a part of the refrigerant separating means has a refrigerant flow path for causing the refrigerant to flow substantially countercurrently on both end faces of a magnetic core.

In the present invention, the refrigerant separating means partitions the refrigerant for each end face of the magnetic core, and the refrigerant flow path provided in a part of the refrigerant separating means determines the direction of the refrigerant flowing to the end face of the magnetic core,
Furthermore, it plays the role of moving the coolant to the other end face of the magnetic core.

In order to eliminate stagnation of the refrigerant, the flow path provided in the refrigerant separation means preferably has a countercurrent flow at the end face of the magnetic core. That is, it is preferable that the adjacent refrigerant flow paths are located at substantially point-symmetrical positions with respect to the central axis of the magnetic core.

[Example] Examples of the present invention will be described in detail below.

FIG. 1 shows a sectional view of an embodiment of the magnetic component of the present invention.

In FIG. 1, a central body 5 made of an insulator is a magnetic core 1
a and 1b are mounted, and these are attached to the upper and lower supports 6 and the side walls 9.
The six magnetic cores 1a and 1b installed in the container are made by simultaneously winding a Go-based amorphous alloy with a polyethylene terephthalate film as an interlayer insulating material, and each has dimensions of 120φ x 6.
It is 0φx25t (mm).

Further, each of these magnetic cores is provided with refrigerant separating plates 2a and 2b formed of an insulator on the outer circumferential surface thereof as refrigerant separating means to partition the refrigerant 14 flowing to both end surfaces of the magnetic core.

Furthermore, partition plates 3a and 3b made of an insulator are provided between the magnetic cores 1a and 1b and above the magnetic core 1b.

By the refrigerant flow paths 4a, 4b, 4c, 4d provided in the refrigerant guide plates 2a, 2b and the partition plates 3a, 3b,
The refrigerant 14 entering from the refrigerant inlet 10 flows in the direction of the arrow in FIG. This refrigerant is cooled by a heat exchanger (not shown), returned to the inlet 10, and circulated.

FIG. 2 shows a sectional view taken along the line AA in FIG. 1. FIG. 2 also shows the winding 29 wound around the magnetic core, which is omitted in FIG. Both ends of this winding 29 are connected to the input end 7 and the output end 8 in FIG.

The winding 29 is connected to the groove 13 formed in the center body 5 and the refrigerant separation plate 2.
A, 2b and a through hole 12 provided to pass through the partition plate 3a form a five-turn coil.

The magnetic component shown in FIG. 1 was used in the saturable reactor 26 of the circuit shown in FIG. 4 assuming a copper vapor laser, and temperature changes on the surface of the magnetic core were measured with a thermocouple.

The circuit shown in FIG. 4 switches a high voltage using a thyratron 22.

Further, the coil 27 suppresses sudden changes in current caused by the Cyrad Ron 22.

Viscosity 51IIIm as a refrigerant! /S silicone oil was used, the flow rate was 101/+in, and the refrigerant temperature at the inlet io was set to 207.

The conditions of the circuit are input voltage Vi = 17 kV, repetition frequency 5 kHz, operating time 60 minutes, and capacitor 2.
3.24 is 6nF each, capacitor 25 is 2°7
nF, the load 28 is a 1Ω resistor.

As a result, the surface temperature of the magnetic core did not exceed 30° C. in any part, and sufficient cooling was achieved.

Further, as a comparative example, the refrigerant separation plates 2a and 2b of the magnetic core components shown in FIG. 1 were removed, and the flow passage 4b of the partition plate 3a was formed on the opposite side, that is, on the left side in FIG. Measurements were also made when the direction of flow of the refrigerant flowing through each end face was made to be the same for each magnetic core. In this case, other conditions are the same as in the example.

In the comparative example, the surface temperature of the magnetic core increased on the lower surface of the magnetic core 1a, reaching a maximum of 65° C. at some points.

This exceeds the operating temperature of polyethylene terephthalate, which is used for glabellar insulation, at 60° C. or lower, and indicates that there is a risk that the interlayer insulation may be destroyed.

Although this embodiment shows an example in which two stages of magnetic cores are used, a good cooling capacity can be obtained even in the case of a single stage of magnetic cores as shown in FIG. In this case, the refrigerant 14 flows in the direction of the arrow in FIG.

Further, it is preferable that the partition plates 3a and 3b shown in FIG. 1 be as thin as possible. Moreover, even without these partition plates, sufficient cooling capacity can be obtained by positioning the flow path 4C of the coolant guide plate 2b on the opposite side, that is, on the right side in FIG.

Note that the advantage of adding the partition plate is that it increases the coolant flow velocity at the end face of the magnetic core and promotes heat diffusion from the magnetic core.

[Effects of the Invention] By using the magnetic component having the structure of the present invention as a saturable reactor of a high voltage pulse generator, it is possible to prevent deterioration of magnetic properties due to heat generation of the magnetic core, and to construct a stable circuit. . In addition, since the magnetic core can be sufficiently cooled, inexpensive materials such as polyethylene terephthalate can be used as the interlayer insulating material for the magnetic core, instead of using highly monovalent materials with excellent heat resistance such as polyimide. is also valid.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of the present invention, Fig. 2 is a sectional view taken along line AA in Fig. 1, Fig. 3 is a diagram showing another embodiment of the invention, and Fig. 4 is A configuration diagram of a circuit used for evaluation of the present invention,
FIG. 5 is an explanatory diagram showing an outline of the high voltage pulse generator. la, lb: magnetic core, 2a, 2b two refrigerant separation plates, 3a, 3
b: Partition plate, 4a, 4b, 4c, 4d: Refrigerant channel, 1
0: Refrigerant inlet, 11: Refrigerant outlet, 14: Refrigerant, 15
:Laser emission 'w1 electrode 16, 17, 18, 23, 24,
25: Capacitor, 19.20, 21.26: Saturable reactor, 22: Thyratron, 28: Load, 29: Winding y diagram friend ■

Claims (1)

[Claims] (1) In a magnetic component for a high-voltage pulse generator in which a magnetic core is installed in a refrigerant, a refrigerant separating means provided to separate the refrigerant on both end faces of the magnetic core at the side surface of the magnetic core, and one part of the refrigerant separating means are provided. A magnetic component for generating high voltage pulses, comprising a flow path for causing the refrigerant to flow substantially countercurrently on both end faces of a magnetic core.