JPH03141621A - Pulse circuit element - Google Patents

Abstract

PURPOSE:To improve cooling capacity by providing ducts in which refrigerants flow independently at each core end parallel with the direction of the lamination of a race-truck-shaped magnetic core and flow independently in the circumferential direction, respectively, by the half circuits of the magnetic core. CONSTITUTION:A saturable reactor is made by putting an insulating member 2 and winding a conductor winding 3 around a race-truck-shaped magnetic core 1, in which an insulating layer and a magnetic substance layer are laminated alternately from the inner periphery to outer periphery and which is molded in flat shape different in long diameter and short diameter. Ducts 5a and 5b for cooling are provided between the upper side of the magnetic core, parallel with the direction of the lamination of the magnetic substance layer and the insulating layer, and the insulating member 2, and ducts 6a and 6b for cooling are provided between the under side of the magnetic core, parallel with the direction of lamination of the magnetic substance layer and the insulating layer, and the insulating member 2. The ducts 5a and 5b and 6a and 6b for cooling are provided each independently. Moreover, the duct 5 for cooling and the duct 5b for cooling, and the duct 6a for cooling and the duct 6b for cooling are provided independently in the circumferential direction, respectively, by the half circuits of the magnetic core.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a saturable reactor used in a pulse circuit element, particularly a pulse circuit element that generates short pulses of high voltage.

[Conventional technology]

Figures 4(a) and 4(b) each show, for example, a magazine (W, S, M
ELVILLE; RADIO5ECTION, Pap
er Na 1034 (1951) p185), showing a partially cutaway plan view and a side view of a conventional pulse circuit element. In the figure, (1) is a racetrack-shaped mountain core in which insulating layers and magnetic layers are alternately laminated from the inner core toward the outer core, and is formed into a flat shape with different major and minor axes; (2) is an insulating member, (3) is a conductor winding, (
4) is a cooling duct provided between the outer side of the core and the insulating member (2).

Next, the operation will be explained.

In Figure 4, the racetrack-shaped magnetic core (1) is made by overlapping a thin magnetic metal tape and an insulating tape and wrapping it in multiple layers. A saturable reactor is formed by winding the winding (3). The magnetic core is cooled by creating a gap between the side surface of the magnetic core (1) and the insulating member (2), and using a duct (4
), the cooling medium flows along this duct (4), and the cooling medium in contact with the side surface of the magnetic core (1) flows through the magnetic core (
This is done by removing the heat of 1 hour.

FIG. 5 shows the magnetic characteristics of the magnetic core used in the saturable reactor. The magnetic core is initially saturated with a reverse current at point (a) of B''-Br, ) (=Q. Then, when a current I is passed through the conductor winding (3), the magnetic core (
11, when the magnetic path length of the core is l, a magnetizing force H (=2πI/1) proportional to the current I is generated, and the magnetic body of the core is magnetized in response to the magnetizing force H in a racetrack shape. is,
A magnetic flux density B determined by the properties of the magnetic material is generated, and increases almost linearly to point (b) via the coercive force HC determined by the magnetic material and the operating frequency. At this time, the inductance Lus of the magnetic core is proportional to the relative magnetic permeability μ8=dB/dH of the magnetic core, and the voltage held by the magnetic core is V=LusX(dI/dH).
dt), and when B reaches point (b) of the saturation magnetic flux density Bs, increasing H hardly increases any further, and the relative permeability μS of the magnetic core becomes 1, so the inductance of the magnetic core L3 decreases drastically, the voltage held by the racetrack magnetic core becomes almost O, and a voltage is generated in the load. In this way, the saturable reactor acts as a kind of switch whose inductance drops rapidly. At this time, an iron loss approximately twice the product of the coercive force HC and the saturation magnetic flux density BS occurs as a loss in the magnetic core, and the magnetic core generates heat due to this loss.

Since HC increases as the operating frequency range increases,
Used for TEA-CO2 laser, excimer laser, etc.
A saturable reactor that requires high-speed switching has a very large heat generation area.

In this way, the magnetic core of the saturable reactor generates heat due to iron loss and the core humidity increases, so it is necessary to cool it with a cooling medium to maintain the core temperature below a certain temperature determined by the magnetic material.

The conventional saturable reactor I magnetic core shown in Figure 4 cools the entire magnetic core by providing a duct on the outer side (and inner side) of the core and flowing a cooling medium through it. .

[Problem to be solved by the invention]

The saturable reactor of the conventional pulse circuit element has the above-mentioned configuration, so heat can only be removed from the outermost (and inner) core winding layer that is in contact with the cooling medium, and heat is removed from the core winding layer near the center. The generated heat is removed by radial heat conduction to the outside (and inside) through the gi metal tape and the insulating tape. Insulating tapes generally have poor thermal conductivity, and therefore their thermal conductivity limits cooling efficiency. Also, along the winding 11 of the core (that is, along one direction where the insulating layer and the magnetic layer are
), the total length of the cooling medium duct is twice as long as the core magnetic path length, and as the cooling medium flows, the temperature of the cooling medium increases. As a result, the cooling effect is reduced, resulting in a large temperature non-uniformity between the core temperature at the inlet and outlet of the cooling medium.

Saturable reactors that operate in a high frequency range, such as those used in pulse circuit elements that generate fast-rising pulses, have particular problems, such as the inability to cool the magnetic core sufficiently and the inability to achieve high repetition rates. Ta.

This invention was made to solve the above-mentioned problems, and it dramatically improves the cooling capacity and allows for high-repetition,
The present invention also aims to realize a pulse circuit element that can obtain a saturable reactor with high-speed switching.

[Means to solve the problem]

In the saturable reactor of the pulse circuit element according to the present invention, a cooling medium flows independently through each core end face parallel to the stacking direction of the racetrack-shaped magnetic core, and each half of the racetrack-shaped magnetic core is Each duct is provided with a cooling medium flowing independently in the circumferential direction.

[For production]

In the saturable reactor of the pulse circuit element according to the present invention, the core is semicircular in the longitudinal direction of the core, and a duct that flows through the end face of the core is provided independently on the lower end face of the core. By flowing a cooling medium, heat can be removed from the end face of the magnetic core without going through the insulating layer, and since one duct can be shortened to half the magnetic path length of the core, cooling capacity is dramatically improved.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
In Figures (a) and (b), # (52X5b), which is the same as in Figure 4 in (1) to (3), indicates the upper end surface of the magnetic core parallel to the lamination direction of the metal tape and insulating tape, and the insulating member. (2) Cooling duct provided between (6aX6b
) is a cooling duct provided between the lower end surface of the magnetic core parallel to the lamination direction of the metal tape and the insulating tape and the insulating member (2), and the cooling duct (5a) (5b) and the cooling duct (6a) and (6b) are each independent.

Further, the cooling duct (5a), the cooling duct (5b) and the cooling duct (6a) and the cooling duct (6b) are provided independently in the direction of each half of the magnetic core.

Next, the operation will be explained.

The magnetic core of the saturable reactor, with switching,
It has already been mentioned that since heat generation occurs due to iron loss and the core temperature rises, it is necessary to cool the core with a cooling medium to keep the core temperature below a certain humidity determined by the magnetic material.

Therefore, the core is cooled by flowing the cooling medium along the winding layer of the magnetic core, so that the upper and lower end faces are half-circular, but at this time, the cooling medium releases heat from the contact surface with the core end face. take away. Here, since the core end face is an end face parallel to the lamination direction in which the insulating tape and the metal tape are laminated, the heat inside the core is removed only by heat conduction within the metal tape, without passing through the insulating tape. In addition, since the flow of one cooling medium only becomes semi-solid along the core, the temperature rise of the cooling medium due to the flow of the cooling medium is small, and together these factors dramatically improve the cooling capacity. .

In the above embodiments, the racetrack-shaped magnetic core is formed by winding multiple layers of metal tape and insulating tape. It's okay. Furthermore, when a plurality of these magnetic cores are used as a set, gaps may be provided between each core, and a duct may be formed between the cores.

Furthermore, in the above embodiment, the insulating member (2) around which the conductor winding (3) is wound is used as a duct through which the cooling medium flows. As shown in FIGS. 2(a) and 2(b), a compact structure can be easily achieved by using the inner conductor (7), the outer conductor (8), or both as the duct wall. Here, FIGS. 2(a) and 2(b) are a vertical cross-sectional view and a cross-sectional view, respectively, showing a pulse circuit element according to another embodiment of the present invention, and FIG. 2(a) is a diagram of FIG. 2(b) is a sectional view taken along line AA. FIG. 2(b) is a sectional view taken along line BB in FIG. 2(a).

Furthermore, when used at high voltage, Fig. 3 (a) (b)
The inner conductor (7) or the outer conductor (8) as shown in
An insulator 03Q4 inserted between the magnetic core (1) and the magnetic core (1) may be used as a duct wall.

In addition, Fig. 2 (a) (b) and Fig. 3 (a) (b)
), 01) is the inlet of the cooling medium, (6) is the outlet of the cooling medium, and the arrows indicate the flow of the cooling medium.

A pulse circuit is constructed by providing a duct in which a cooling medium flows independently through each core end face parallel to the direction, and through which a cooling medium flows independently in the local direction through each of the semi-solid racetrack-shaped magnetic cores. By configuring a saturable reactor for the element, the cooling capacity is dramatically improved, and because short pulses are generated, a pulse circuit element with a saturable reactor that operates in a high frequency region can be operated at high repetition rates. There is.

[Brief explanation of the drawing]

FIGS. 1(a) and 1(b) are a partially cutaway plan view and a side view showing a pulse circuit element according to an embodiment of the present invention, respectively;
FIGS. 2(a) and 2(b) are longitudinal sectional views and horizontal sectional views showing pulse circuit elements according to other embodiments of the present invention, and FIGS. 3(a) and 3(b) are respectively illustrative of still other embodiments of the present invention. A vertical cross-sectional view and a cross-sectional view showing a pulse circuit element according to an example, FIGS. 4(a) and 4(b) are a partially cutaway plan view and a side view showing a conventional pulse circuit element, respectively, and FIG. 5 is a saturable FIG. 2 is a characteristic diagram showing the magnetic characteristics of a magnetic core used in a reactor. In the figure, (1) is a racetrack magnetic core, (5
a) (5bX6a) (6b) is a cooling duct. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] In a pulse circuit element that uses a racetrack-shaped magnetic core as a core for a saturable reactor, in which insulating layers and magnetic layers are laminated alternately from the inner station toward the outer station, and the racetrack-shaped magnetic core is formed into a flat shape with different major and minor axes. A cooling medium flows independently through each core end face parallel to the lamination direction of the racetrack-shaped magnetic core, and a cooling medium flows independently in each half of the racetrack-shaped magnetic core in the direction. A pulse circuit element characterized by being provided with a duct.