JPH02231703A - Orthogonal saturable reactor - Google Patents

Abstract

PURPOSE:To secure sufficient DC superimposing characteristic for the inductance of a winding under control by forming a part whose magnetic resistance is large only on a magnetic path with respect to the winding under control on a core body. CONSTITUTION:A magnetic path 14 with regard to a winding under control 12 is formed in a loop shape as follows so that the path is approximately in parallel with gap parts 6 and 10: a planar core 3 magnet legs 111 (112) a base part 7 of a core part 4 of a stage having equal legs magnet legs 113 (114) the planar core 3. A magnetic path 15 with regard to another winding under control 13 is formed in the following loop shape so that the path crosses the gap parts 6 and 10 at a right angle: a core part 5 of the planar core 3 the gap part 6 a core part 5' of the planar core 3 the magnet legs 112 (114) a core part 9 of the core 4 of the stage having the equal legs the gap part 10 a core part 8 of the core 4 of the stage having the equal legs the magnet legs 111 (113) the core part 5 of the planar core 3. Therefore the paths can be independently designed so that the magnetic resistance of the magnetic path 14 is small and the magnetic resistance of the magnetic path 15 is large. Thus the DC superimposing for the inductance of the winding under control 13 can be secured.

Description

[Detailed Description of the Invention] The details of the orthogonal saturable reactor of the present invention will be explained according to the following items. A. Industrial application field B. Summary of the invention C. Prior art [Figure 13] D. Problems to be solved by the invention [Figures 5 and 13] E. Means for solving problemsF. Example [Figures 1 to 12] F-1. First embodiment [Figures 1 to 6] a. structure[
Figures 1 to 3] b. Action [Figures 2 to 5] C. Application example [Figure 6] F-2. Second embodiment [Figures 7 to 9] a. Structure b. Effect F-3. Third embodiment [Figures 10 to 12] a. Structure b. ActionG. Effects of the Invention (A. Field of Industrial Application) The present invention relates to a novel orthogonal saturable reactor. Specifically, the core body has two flat plate parts and four magnetic legs connecting the flat plate parts at their four corners, and the control winding is wound across the two magnetic legs, and the controlled winding is wound over the two magnetic legs. In an orthogonal saturable reactor in which a wire is wound across two magnetic legs in a direction perpendicular to the winding direction of the control winding, the control winding is It is possible to reduce the number of windings, thereby making it possible to miniaturize the orthogonal saturable reactor and improve control responsiveness by lowering the inductance of the control wire.Moreover, the magnetic resistance related to the control winding described above can be reduced. The purpose of this paper is to provide a new orthogonal saturable reactor that does not cause a decrease in the magnetic resistance of the magnetic path related to the controlled winding and cause deterioration in the characteristics of the orthogonal saturable reactor. (B. Summary of the Invention) The orthogonal type saturable reactor of the present invention is designed to prevent the magnetic resistance of the magnetic path related to the controlled winding from becoming small due to the reduction of the magnetic resistance of the magnetic path related to the control winding. A part with high magnetic resistance is formed in the core body only on the magnetic path related to the controlled winding, and this makes it possible to control the inductance of the controlled single wire with a small control current even if the number of turns in the control winding is small. This makes it possible to shorten the time required for the winding process of the control winding, downsize the orthogonal saturable reactor, and improve response speed by reducing the inductance of the control winding. (C. Prior art) [Figure 13] In a switching regulator, DC-DC converter, etc., the DC input power source is controlled on and off by an active switching element provided in an oscillation drive circuit, and the voltage at this time is transformed by a power transformer. A switching power supply device that can obtain a stable constant voltage output from its secondary side is known, for example, as disclosed in Japanese Patent Laid-Open No. 62-64266. FIG. 13 shows an example of the structure of an orthogonal saturable reactor a used in the saturable reactor transformer of the device described above. b in the figure is the core body, which includes a flat core C and four magnetic legs d+
, da, d3, and d4, and the flat plate core C and the isosceles core d are bonded by interposing gap materials e, e, and e between them. The gap material e,e%e,e
is a material whose magnetic permeability is sufficiently smaller than that of the material forming the flat plate core C and the isosceles core d. f is the control winding, and the magnetic leg dlx do of the isosceles core d
, ds, and d4, the wires are wound so as to straddle two adjacent wires d1, d. g is a controlled body wire, which is wound across the magnetic legs d, d4 in a direction perpendicular to the winding direction of the control body wire f, thereby reducing the current flowing through the control body wire f. can be controlled to change the inductance of the controlled winding g.

(D. Problem to be solved by the invention) [Figure 5, $13
By the way, in the orthogonal saturable reactor a as described above, the magnetic resistance to the magnetic flux φf due to the control winding f1 and the magnetic flux φ due to the controlled winding g is expressed as R. The number of turns of the control winding f is Nfs, the control current is If, and the number of controlled windings g is
If the number of turns is Ni and the current flowing through it is I, then ? The following relationship is obtained, and the saturation magnetic flux of core body b is φ■
Then, φ. The relational expression 1〉φ, +φ# − (3.) holds true. Therefore, as can be seen by substituting equations (1) and (2) into equation (3), in order to control the inductance of the controlled single line g with a small number of units Nf and a smaller control current Ir, the magnetic Resistance R. It is desirable to reduce the magnetic resistance R, but in this way, the magnetic resistance to the magnetic flux φ is the same value as the magnetic resistance to the magnetic flux φ, so in order to obtain sufficient DC superposition of the inductance of the controlled winding g, this magnetic resistance R ．．
The problem is that it conflicts with the demand to increase the size of . For this reason, the magnetic resistance R in the conventional orthogonal saturable reactor a. As for the value of , the reduction of the number N, and the magnetic resistance R
．． We have no choice but to settle for a value that is a compromise between the two conflicting demands of increasing The shape becomes large, and if (+a^)-Lr (+aH
) (Lr is the inductance of the control winding f) As is clear from the graph h in the characteristic diagram, Lf is large, which causes various problems such as delay in control response. be.

(E. Means for Solving the Problems) Therefore, in order to solve the above-mentioned problems, the orthogonal saturable reactor of the present invention reduces the magnetic resistance of the magnetic path related to the control winding, and the controlled winding In order to prevent the magnetic resistance of the magnetic path related to the wire from becoming small, a portion with high magnetic resistance is formed in the core body only on the magnetic path related to the controlled winding.

Therefore, according to the orthogonal saturable reactor of the present invention, by reducing the magnetic resistance of the magnetic path related to the control winding, the inductance of the controlled winding can be varied with a minute control current even if the number of turns of the control winding is small. This makes it possible to miniaturize the orthogonal saturable reactor and improve its responsiveness by reducing its inductance.In addition, by reducing the magnetic resistance of the magnetic path related to the control winding, the magnetic resistance of the magnetic path related to the controlled winding is reduced. By forming a portion with large magnetic resistance on the magnetic path, sufficient DC superposition characteristics can be obtained for the inductance of the controlled winding. (F. Embodiments) [Figures 1 to 12] Details of the orthogonal saturable reactor of the present invention will be described below according to the illustrated embodiments.

(F-1. First embodiment) [Figures 1 to 6] Figures 1 to 6 show the first embodiment of the orthogonal saturable reactor of the present invention.
This shows Example 1 of . (a. Structure) [Figures 1 to 3] Reference numeral 2 in the figure represents a core body, which is composed of a flat core 3 and an isosceles core 4. The flat core 3 has box-shaped core parts 5, 5 made of ferromagnetic material.
A gap portion 6 made of a material having a lower magnetic permeability than the core portions 5 and 5′ is interposed between the core portions 5 and 5′.

Similar to the flat plate core 3, the isosceles core 4 has a gap part 10 at the joint surface of the two core parts 8 and 9 that constitute the flat plate base 7.
111% 11
2% 113 and 114 are provided protrudingly, of which the magnetic legs 111 and 113 are integrally formed with the core part 8, and the magnetic legs 1
12 and 11'4 are integrally formed in the core portion 9. In addition, the core parts 8, 9 and the magnetic legs 111, 112, Ils, . 1
The material of 14 is the same as that of the core parts 5 and 5' of the flat core 3 described above, and the material of the gap part 10 is the same as that of the gap part 6 of the flat core 3. Then, by gluing or the like, the opposite base 7 of the magnetic leg 111,lls is attached.
The side end surfaces and both corner portions of the core portion 5 of the flat core 3 on the side opposite to the gap portion 6 are respectively coupled, and the magnetic legs 11*,
The core body 2 is formed by joining the end face of the flat core 3 on the opposite side to the gap part 6 and the both corners of the core part 5' of the flat plate core 3 on the side opposite to the gap part 6. The gap portion 6 of the isosceles core 4 and the gap portion 10 of the isosceles core 4 are arranged in a parallel positional relationship.

Reference numeral 12 denotes a control winding, which is wound across the magnetic leg 11I of the core section 8 and the magnetic leg 112 of the adjacent core section 9, and has a number of turns of N. It is said to be times. Reference numeral 13 denotes a controlled winding, which is wound in a direction perpendicular to the winding direction of the control line 12, for example, so as to straddle the magnetic legs 112 and 114 of the core part 9. The number of volumes is said to be NB.

(b. Effect) [FIGS. 2 to 5] However, in the above-described orthogonal saturable reactor 1, the magnetic path 14 related to the control line 12 is connected to the gap portions 6 and 10, as shown in FIG. Flat core 3 so that it is almost parallel →
Magnetic leg i1+(ll2) Base 7 of isopod core 4→Magnetic leg IIs (114)" Formed in a loop shape of flat plate core 3, and magnetic path 15 related to the other controlled single line 13
3, the core part 5 of the flat core 3 → the gap part 6 → the core part 5' of the flat core 3 → the magnetic leg 112 ( t 1
4) → Core part 9 of isosceles stand core 4 → Gap part 10 → Core part 8 of isosceles stand core 4 → Magnetic leg 111C! t, ) → The core 5 of the flat core 3 is formed in a loop shape. Therefore, the magnetic resistance of the magnetic path 14 is RmC, and the magnetic resistance of the magnetic path 15 is R. B, magnetic resistance Rl. It becomes possible to design each independently so that c is small and R is large.

In other words, the magnetic flux due to the control line 12 is φ. , where the control current is IC, the magnetic flux due to the controlled single wire 13 is φ3, the current flowing therein is In, and the saturation magnetic flux of the core body 2 is φ■.In the relational expression, the magnetic resistance RI. Since the magnetic resistance R. Reducing ac has no effect on the magnitude of magnetic resistance RIl''<R
．． By setting the value of ' to a sufficiently large value, DC superposition of the inductance of the controlled single line 13 can be ensured.

As understood from FIG. 4, the orthogonal saturable reactor 1 can maintain the same controlled single wire 13 as the conventional one even if the number of turns Nc of the control winding 12 is reduced to about one-third of the conventional number of turns. This results in the DC superposition characteristic of . In addition, FIG. 4(A) shows N in the orthogonal saturable reactor 1.
c=300, the control current 1c (mA) is a parameter, and the horizontal axis is the current Ia (A) flowing through the controlled winding 13.
This is an I, -LB characteristic diagram in which the inductance of the controlled line 13 (which is La (μH)) is plotted on the vertical axis. (iwo.5.1,2,
3, 4, 5, 6.10) respectively show graphs for I-xixlom^. In addition, Fig. 4 CB) shows that the winding of the control winding f is N in the conventional orthogonal saturable reactor a.
I. f-1000 and control current If. as a parameter. -L, (L, is the inductance of the controlled winding g), and in the same figure, 17+ (i=0.5
, 1, 2, 3, 4, 6.10) are each If=iX10m
A graph for case A is shown. In both figures, other conditions such as the number of turns of the controlled winding and the size of the core are the same.

In this case, as a natural consequence of the difference in the number of turns of the control winding, as shown in graph 18 in the IC-Lc characteristic diagram of FIG. 5, the inductance of the control line 12 of the orthogonal saturable reactor 1 is This value is quite small compared to .

(c. General example) [Fig. 6] Fig. 6 shows an example 19 in which the orthogonal saturable reactor 1 is applied to an orthogonal saturable reactor transformer. Incidentally, the parts in this orthogonal saturable reactor transformer 19 that are the same as those in the orthogonal saturable reactor 1 described above are designated by the same reference numerals as the same parts in the orthogonal saturable reactor 1. The explanation will be omitted. 20 is a primary winding, and magnetic legs 111, . 11
It is wound across the magnetic legs 112 and 114 so as to be perpendicular to the winding direction of the control line 12 wound around the magnetic legs 112 and 114. 21 and 22 are secondary windings, which are wound so as to straddle the magnetic legs 112 and 114 similarly to the primary winding 20 described above.

The secondary windings 21 and 22 are then controlled windings,
The inductance is controlled by the control line 12.

(F-2. Example of $2) [Figures 7 to 9] Figures 7 to 9 show the second embodiment of the orthogonal saturable reactor of the present invention.
This shows Example IA of. Note that the orthogonal saturable reactor IA shown in this second embodiment is different from that in the first embodiment 1.
The difference is that in the structure of the core body, gap parts 6 and 10 with low magnetic permeability were provided in some parts in the first embodiment 1, whereas in the second embodiment IA, such gap parts were provided. The only difference is that a groove is formed on the magnetic path related to the controlled winding without providing a groove. Among the parts of the second embodiment IA, the same parts as in the first embodiment 1 are provided with a groove. The same reference numerals used for similar parts in the first embodiment will be used to omit the explanation. The same method of explanation applies to the third embodiment described later.

(a. Structure) 23 is a core body, which includes a flat core 24 and an isosceles core '25.
It consists of. The flat plate core 24 has a square, thin plate shape, and has a groove 26 of a predetermined depth extending in a straight line from the center to both ends and reaching the end face. The isosceles core 25 has a base 2 having the same shape as the flat plate core 24.
4 wooden magnetic legs 2Bs of equal length from the four corners of 7, 28
2, 28s, and 284 are provided protrudingly. Similarly to the flat core 24, a groove 29 is formed in the base 27, extending in a straight line from the center to both end surfaces.
anti-groove 2 of one part of 7 divided by groove 29
Magnetic legs 281, 283 are provided protruding from both corners on the 9 side, and magnetic legs 282, 284 are provided protruding from both corners on the other side opposite to the groove 29.

The core body 23 is arranged such that the grooves 26 of the flat plate core 24 and the grooves 29 of the isosceles core 25 are in a parallel positional relationship. , 28, 284 on the side opposite to the base 27 are connected to the four corners of the flat core 24, and the control line 12 is wound across the magnetic leg 28 and the adjacent magnetic leg 282. Moreover, the controlled winding 13 is wound across the magnetic legs 28 and 284. (b. Effect) However, in the above-mentioned orthogonal saturable reactor IA,
As shown in FIG. 8, a magnetic path 30 related to the control line 12 is formed in a loop shape extending parallel to the grooves 26 and 29.

On the other hand, since the magnetic path 31 related to the controlled line 13 crosses the grooves 26 and 29 in a direction perpendicular to them, as shown in FIG. As a result of this formation, portions 32 and 32' with large magnetic resistance are formed in the flat plate core 24 and the isosceles core 25, respectively.

Therefore, the magnetic flux φ of the multi-control line 13. Magnetic resistance R
It is possible to increase the value of mB and to decrease the values of the magnetic resistances R and C to the magnetic flux φC of the control line 12, and as in the first embodiment 1 described above, the number of turns Nc of the control line 12 is small. It is also possible to obtain the same DC superposition characteristics as the conventional orthogonal saturable reactor a with a small control current IC. (F-3. Third Embodiment) [Figs. 10 to 12] Figs. 10 to 12 show a third embodiment IB of the orthogonal saturable reactor of the present invention.

(a. Structure) Numeral 33 is a core body, which includes a flat plate core 34 shaped like an "H", the base of which is also shaped like an "H", and four wooden magnetic legs connected to this at the four corners of the base. Consists of an integrally formed isosceles core 35. The flat plate core 34 is integrally formed with rectangular parallelepiped portions 36, 36' having the same shape and a connecting portion 37 having a sufficiently smaller cross-sectional area in the longitudinal direction. On the other hand, the isosceles core 35 has a base 38 having the same shape as the flat core 34, and has two parts 39, 39'.
and a connecting portion 40 connecting these are integrally formed,
From both corners of one portion 39 on the anti-coupling portion 40 side,
+, 41s are integrally protruded, and magnetic legs 41. , 41. are integrally protruded.

The core body 2 has magnetic legs 41+, 41 such that the flat core 34 and the base 38 of the isosceles core 35 are arranged opposite to each other.
The end of s on the side opposite to the base 38 is one part 3 of the flat core 34
The end portions of the magnetic legs 412 and 414 on the side opposite to the base 38 are connected to both corners of the other portion 36' of the flat plate core 34 on the side opposite to the connecting portion 37. It is formed by being combined with. Further, the control line 12 is wound across the adjacent magnetic legs 411 and 412, and the controlled line 13 is wound between the magnetic legs 412 and 412.
It is wound across 4.

(b. Effect) However, in the above-mentioned orthogonal saturable reactor IB,
As shown in FIG.
(412) → Part 39 (39') of isosceles core 35
→ Magnetic leg 413 (414) → Portion 36 of flat core 34 (
36'), whereas the magnetic path 43 related to the controlled line 13 is as shown in FIG.
Portion 36 of flat plate core 34 → Connecting part 37 → Portion 36' of flat plate core 34 → Magnetic legs 412, 414 → Portion 39' of isosceles base core 35 Series connection part 40 Portion 39 of isosceles base core 35 → Magnetic Since the legs 411, 413 are formed in a loop shape, such as the portion 36 of the flat core 34, a portion with a small cross-sectional area is formed on the magnetic path 43 by the connecting portions 37 and 40, and the magnetic path 42 is The magnetic resistances R and C can be made smaller, and the magnetic resistances R and B of the magnetic path 43 can be made larger.

(G. Effects of the Invention) As is clear from the above description, the orthogonal saturable reactor of the present invention has a pair of spaced apart flat plate portions connected by four magnetic legs at a portion near the corner. The control winding is wound so as to span two adjacent magnetic legs, and the controlled winding is wound between two magnetic legs in a direction orthogonal to the winding direction of the control winding. In the orthogonal saturable reactor wound across the controlled winding, the controlled winding is It is characterized in that a portion with high magnetic resistance is formed in the core body only on the magnetic path related to the wire.

Therefore, according to the orthogonal saturable reactor of the present invention, by reducing the magnetic resistance of the magnetic path related to the control winding, the inductance of the controlled winding can be varied with a minute control current even if the number of turns of the control winding is small. This makes it possible to miniaturize the orthogonal saturable reactor and improve control responsiveness by reducing its inductance.In addition, by reducing the magnetic resistance of the magnetic path related to the control winding, the magnetic path of the controlled winding can be reduced. The resistance does not become small, and sufficient DC superposition characteristics can be obtained for the inductance of the controlled winding by forming a portion with large magnetic resistance on the magnetic path.

In addition, although the core body shown in the above-mentioned embodiment has a configuration in which a flat plate core and an isosceles core are combined, the technical scope of the orthogonal saturable reactor of the present invention is limited to such a structure. This is not to be construed narrowly; for example, two isosceles base cores having exactly the same shape with four magnetic legs protruding from the four corners of a flat plate part may be formed by joining them at the end faces of the magnetic legs. Of course, it is good to do so.

[Brief explanation of the drawing]

Figures 1 to 6 show the first diagram of the orthogonal saturable reactor of the present invention.
Fig. 1 is a perspective view, Fig. 2 is a cross-sectional view taken along line If-II in Fig. 1, and Fig. 3 is a cross-sectional view of Fig. 1.
Fig. 4 is a cross-sectional view taken along line III-III in the figure, and is a characteristic diagram showing the DC superposition characteristics of the orthogonal saturable reactor in comparison with the DC superposition characteristics of the conventional orthogonal saturable reactor. In the first embodiment, the number of control windings N, = 30
In-L with control current Ic as a parameter when 0!
1 characteristic diagram, (B) shows the control current If as a parameter for I, -L. FIG. 5 is an Ic(f)-LCifl characteristic diagram showing the relationship between the control current and the inductance of the control winding together with that of the conventional one, and FIG. 6 is a perspective view showing a typical example. , FIG. 7 to FIG. 9 show a second embodiment of the orthogonal saturable reactor of the present invention, FIG. 7 is a perspective view, and FIG. 8 is a cross section taken along line 1-2 in FIG. 9 is a sectional view taken along line IX-[X in FIG. 7, and FIGS. 10 to 12 show a third embodiment of the orthogonal saturable reactor of the present invention. is a perspective view, FIG. 11 is a sectional view taken along the line XI-XI in FIG. 10,
FIG. 12 is a sectional view taken along the cutting line in FIG. 10, and FIG. 13 is a perspective view showing an example of a conventional orthogonal saturable reactor. Explanation of symbols 1... Orthogonal saturable reactor, 2... Core body, 3, 7... Flat plate part, 6, 10...
... Part with large magnetic resistance, 111, 112, II3,
Il4...Magnetic leg, 12...Control winding, 13...Controlled winding, 22...Controlled winding,...Orthogonal saturable reactor,...Core body, 27.・・Flat plate part, , 282 , 28s , 284 ・・Magnetic leg, 32′・
... part with large magnetic resistance, ... orthogonal saturable reactor, ... core body, 38... flat plate part, 40... part with large magnetic resistance, , '12, 41s, 414... magnetic leg 2 1
, I A 2 4, 28, 3 2, I B ・ 3 3 ・ 3 4, 3 7, Ic (l>-Lc) Characteristic diagram Fig. 5 21.22・4*+aalm Perpendicular view (general example) Fig. 6 Ear ringing rn dimension; hen = r Orn dimension 1-1 perspective view (conventional example) Fig. 13

Claims (1)

[Claims] A pair of spaced-apart flat plate parts have a core body configured to be connected by four magnetic legs near the corners, and a control winding is connected to two adjacent magnetic legs. In an orthogonal saturable reactor in which the controlled winding is wound across two magnetic legs in a direction perpendicular to the winding direction of the control winding, the magnetic path related to the control winding described above is In order to prevent the magnetic resistance of the magnetic path related to the controlled winding from decreasing due to the reduction in the magnetic resistance of the controlled winding, a portion with high magnetic resistance is formed in the core body only on the magnetic path related to the controlled winding. Orthogonal saturable reactor.