JPS59171110A - Choke coil - Google Patents

Abstract

PURPOSE:To obtain a choke coil which has high flux density, small high frequency magnetic loss and non-linear inductance DC superposition characteristics by connecting a core with steady permeability and a core with high permeability magnetically in parallel. CONSTITUTION:A core 1 is composed of powder of magnetic alloy, which has steady permeability and high flux density, molded and sintered into an annular shape. A core 3 is composed of high permeability magnetic alloy wound into an annular shape like the core 1. These cores 1 and 3 are arranged to form parallel magnetic circuit and a common winding is applied to them to form a choke coil. While a load current is small, the coil shows the characteristics of high permeability magnetic alloy and has a high impedance. As the load current is increased, the part of the core 3 is saturated and inductance drops sharply. After that, the characteristics of the core composed of the sintered powder appear and the coil reaches final saturation. With this constitution, a choke coil which has non-linear inductance DC superposition characteristics can be obtained.

Description

[Detailed Description of the Invention] (Technical Field of the Invention) The present invention relates to a choke coil used in a suspension device a circuit of a power source device such as a Suitz-Nunk power supply, a DC-J) O converter, etc. high, high+,
(Includes an improved choke coil that generates more heat even against wave ripples.)

(Technical view of the invention and its problems) In the choke coil, the direct current and direct current flow are combined and flow together.
An air gap is provided in the magnetic core to prevent saturation due to direct current, and the structure is as shown in FIG. 1, for example.

', : t-1 times (a) is mainly composed of ferrite with 6゛η】! A gap (2) is provided at the abutting portion of the magnetic core (1) of the 8■ shape, +1: fI: shape, etc. Figure 1 (h)
In the case where the core is mainly made of silicon steel,
One or two places of the link-shaped or taper-shaped magnetic core (1) are cut, and the impregnation (2) is provided at two places.

By the way, the choke coils of 7'L and others have the following problems, and improvements have been desired. For example, a ferrite choke coil has a magnetic flux density force S of about 5 kg at most, so its dimensions must be extremely large to withstand one large DC current), which goes against the nine principles of equipment miniaturization, and a silicon plate-wound iron core. The 1,000 yoke coil has a magnetic flux W) degree of 18K ()
Although it is relatively large, the high-frequency magnetic loss is large, so when used in recent high-frequency electronic power supplies, it generates heat on the order of 80% of the high frequency ripple, making it unusable.

Furthermore, in the conventional thousand yoke fill shown in FIG. 1, there is a problem in that the amount of change in inktance relative to the superimposed direct current is small. However, the desirable characteristics of a choke coil for a recent DF device are the superimposed direct current across the river or when it is small: 2 I
This characteristic has a non-linear inductance that decreases in inverse proportion to the C1 negative current.This changes the rectification characteristics of the power supply at light loads and reduces the tammy load. There are 10 points because there are points such as no need for .

In other words, the electronic box 1 source detector has a choke coil with high magnetic flux density and low high-frequency magnetic loss, which is formed by Ctη and is of the intacunsu lI'3 flow quality 4.1 or non-approximately 1 type. 8) It was rare.

(Object of the Invention) An object of the present invention is to provide a magnetic coil having a large magnetic flux density, a small high-frequency magnetic Jtj loss, and an intaccumulated direct current superposition L1, which is either monomorphic or non-magnetic.

(Summary of the invention) The choke coil of the present invention has a magnetic core (L-, es, '4R core having a magnetic permeability of 41) arranged so as to magnetically form a parallel circuit. , the fact that these one wire has a common winding makes it durable!

The present invention will be explained in detail below. Figure 2 shows an example of the configuration of the choke coil according to the present invention. l 4zz
'J-sink-shaped powder is formed by molding and sintering.'l
'V1. The Jh spider link is made with a single metal magnetic core of M41Ji, which has a high abrasive strength. It is a magnetic alloy (magnetic). These are arranged to form a magnetic parallel circuit as shown in the figure, and a common winding 4 is applied to the coils to form a choke coil.

As long as the load current of the choke coil v1 constructed in this manner is small, the characteristics of a high magnetic permeability metal appear, and a large intac- nce is exhibited. However, as the loaded paper flow increases, the magnetic core becomes saturated first, the intaccumulation sharply decreases, and then the characteristics of the magnetic core made of sintered powder appear, leading to final saturation. In this way, a choke coil with a special feature of 1-type ink-kukunsu-men-ryu-sha-tatami is constructed.

Since this choke coil is made of a magnetic alloy with a high BM rate and low energy loss, this part has a large ink kukunsu at light loads and even in a saturated state. Does not cause heat. In addition, - the upper part is made of (N1 Fe alloy with high RB powder content and low high frequency magnetic loss, Fe, A, A, S
If it is made of either gold or amorphous metal, it can be made compact and the heat generated under operating conditions can be significantly reduced.

The New York coil of the present invention is not necessarily limited to the 11" configuration shown in FIG. 2. For example, each configuration shown in FIG. 3 has the same effect and should be used depending on the situation. Further, although all of these Uls are shown as link-shaped magnetic cores, they may be in the form of a link or a substantially rectangular frame.

The four-layered alloy forming the magnetic core with high magnetic permeability has high magnetic permeability and has direct current fiI+! Nl in Japanese method
It is desirable to use a material with as small a single frequency air loss as possible, and this is an amorphous alloy.For example, an alloy with the following composition is C64.

4C, that is, the formula % formula % jet) at least J 41! li or more i':
In at least one building from S j-, B, P, and C, 002≦a≦0. J5 72≦X≦80, preferably 004≦a≦012 74≦X≦78. In the above, by adding M, transparent $
1 and the magnetic loss is improved by 0.002 atomic % or more.
The effect is significant at 15 atomic % or less. Further, when the total metal content is 72 or more, the saturation magnetic flux density is large and the thermal stability is good.

In addition, when it is 80 at % or less, the Curie temperature IW does not become higher than the crystallization temperature, high magnetic permeability and low magnetic loss can be obtained, and heat treatment with good change over time can be performed.

Further, among the above alloys, when the ratio of Co to Fθ is around 9426, the magnetostriction is O, and particularly high magnetic permeability is obtained, which is further improved by adding other transitional metals.

Furthermore, the following alloys are also preferred.

Formula (””’+-aMa)XYlJO-XM:'l”
i, V, Or, Mn, Ni, Zr, Nb.

to4o, l(, u, Hf, 'L'a, W,
Re, at least one kind of rare earth element Y: at least one kind from Si, H, P, O)- 0.02≦a≦012 77≦x85 Desirably id O, 0: U≦+ajM0.0879 ≦
X≦83 In addition, the magnetic core having a constant magnetic permeability may be a collector body made of magnetic inert material powder, for example, IJV, shape φ, etc. is a high-frequency temporary magnetism 1i at the flux density
It is desirable to use a material with as little loss as possible. Kosai 1 is E 1 gold with the following composition.

That is, N1- made of 8 (l N i-)'θ alloy etc.
Fe-based alloys, 9 Al-68i-JI''e alloys, etc.) are 1 bar 1θ-8i.
-Amorphous 1↓ made of B (h). In addition, this alloy ζ of Il et al. improves magnetic asthma. JI = elementary, for example Or
It is preferable to add a small amount of transition metal such as ki o , W or the like.

Each of these magnetic base metals is heat-treated under optimal conditions to form a magnetic core.

, Below is an example? Hereinafter, a detailed description of the present invention will be given.

Example I An amorphous textured alloy powder having a composition of 6B15 was molded, sintered, and heat treated to give an outer diameter of 3.
0 m, inner diameter 22 mm, thickness] A magnetic core of 0 length was constructed.

Hitoshi) de ("OO,90FeO,04" bo
, 0 2 NlO, Tl 4)75Si15)3
By winding and heat-treating an amorphous alloy ribbon having a composition of 10, an outer diameter of 21.8 zm, an ivy diameter of 20 mm, and a thickness of 10 V+m was constructed, and this was wrapped around the inner circumference of the above magnetic core at 313 minutes. Matchmaker, I made it fit. The two magnetic cores are assembled together into a case made of Tsukishima, and a formal copper wire of 1.1 am chain is wrapped approximately 40 times around the top of the case. A choke coil was constructed.

As a comparative sample, the outer diameter is 30.2 mm, the inner diameter is 20 mm,
2 mm, no II, 9.9 mm no hi, n, Z
nfu]-ra41- ((m transfer 1B: 5 K, (
)) In the center of the H core, a gap of l, Q mm was formed by the same gap forming process as in the score, and this was then subjected to the same winding process as above (ferrite choke). coil), and 5oii of 3% grain-oriented silicon steel plate.
By winding the rn thin plate ribbon and heat-treating it, the outer diameter is 3.
A magnetic core with a diameter of 0 mm, an inner diameter of 20 mvr, and a thickness of 10 mm was prepared, and the same air gap formation and winding treatment as described above were performed on the core (gay base plate choke coil).

The DC superimposition of the inktance of these choke coils was measured using a LOL meter and a JJ variable DC source. is curve A, the ferrite choke coil is curve 13, and the gay base plate choke coil is curve C.

Also, the switching frequency is 100KI4Z.

One 12V, 5A rated switch is installed.
After passing the rated current for 30 minutes, measure the temperature of the magnetic core (core surface for ferrite choke coils, case surface for the present invention and silicon steel plate coils) using a thermocouple and a technology thermometer. did. These results are the first
It was shown on the clothes.

Uninvented choke coil 22℃ Ferrite choke coil 18℃ □ 1 silicon steel plate choke coil 86℃ □ Among these 11 yoke coils with approximately the same shape and dimensions, the ferrite choke fill saturates with small loads, loads, and currents. Temperature and power when mounted on a silicon steel plate choke coil)
Extremely thick. Also, in both cases, the directivity ηt of inktance
, the car's tatami characteristics are almost flat. On the other hand, the chocolate coil of the present invention has a nonlinear straight line in the low load current range. It has 1-1-, and the temperature is also small.

Example 2 Heat treatment of a magnetic core having a composition of 80%N i-Pθ-MO 11j
(By doing so, a magnetic core with an outer diameter of 30 mm, an inner diameter of 22 mm, and a thickness of 10 mm was constructed.

(Do θ0930r007) 83817B1G TVm; 35 mm, plate thickness μm, amorphous magnetic alloy ribbon was prepared and etched (diameter 30 mm, inner FT:, 20 mm old shape, 20 sheets laminated) and the magnetic core fj
B completed. Combining these two-valued hearts, Soano Acrylic 1/
-1) They were bonded with adhesive and integrated, then insulated by powder coating of Ehokin resin, and 2) - Ink was applied. The choke coil of the present invention was constructed by twisting three formal copper wires having a diameter of 1.3 +, + mφ and twisting them approximately closely together 1 to 10 times.

On the other hand, as a comparative sample, M n , Z n ferrite 1
To (LIFt Song banknotes/J for 5 K (+) E 1-6
Insert a polyimide paper spacer into the E I Jul of the b-type bat core, form a 0.8 mm hole 1.9 and assemble it, and attach a 1.3 mm S hole to this bobbin. A ferrite choke coil (ET type ferrite choke coil) was prepared by twisting 13 P fibers and winding them 10 times.

This J type 1 ferrite choke coil i, t - h
r-7tj It has an occupied volume approximately four times that of the choke coil of the present invention.

The DC superposition characteristics of the ink-cuckuns with the choke coil ζζ of Kou et al. were measured using lj,, (j) (meter) and a J-variant DC' surface source.The results are shown in Figure 51 (not shown). 5 out of 7r invention J" 3-Cucoil is 11j bribe! ?, ),) ■ type ferrite choke Ni]iri" 7J〈shita with double line E. Although the volume of the coil of the present invention is extremely small, it can be used to target the same target.
Tb simplex! Copper χ, pussy, 1st position ``J'
u DL M 戊 C 明に: It has a nonlinear characteristic.

(Effects of the invention) As described above, the choke coil of the present invention is small and has a large size.
It has low heat generation even with respect to temporary ripples, and also has non-linear ink-tance DC superposition characteristics, and is especially useful for switch-circuits, DC-DC converters, and electronic electric devices. It has high practical value as a choke coil used in output rectifier circuits, etc.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing the RW configuration of a conventional choke coil; , FIG. 4 and FIG. 5 show the DC superposition of inductance in the embodiment of the present invention! It is a graph showing VR characteristics.

Claims (1)

[Claims] The magnetic cores (having a magnetic core with r+4+i permeability and a high magnetic permeability) are rearranged so as to magnetically form a parallel circuit, and a common winding is applied to the stiffeners. +21 '+i! A 4B core with a magnetic permeability of less than -4 is formed by an aggregate of magnetic material powder. This description of 1,000-1-kukoil 3゜(3) gun information td, Ni-Fθ thread, A I
I S j-1・゛0-based alloy or amorphous a)〃T1 temple W ['if + RfQ of water] The New York coil described in the second item. ” As z'h 5 skewers A1Δ7・B is formed of an amorphous NiJ magnetic base metal!
Inscribed on the shell of ``lJ Encircle No. 1'', Mr. Sumit 3-Kukoil. (5) The amorphous ta metal has the following composition.
The chalk fill according to item 4, the scope of r1 crystallization. (G O1a M a ) xY 1o o-x to I
: '], "i, V, Or, Mn
, J, ' e , N i , Z r , N b
Mo, Ru, Hf, 'J'a, W,
J: (, e, at least 1 or more rare earth elements Φ Y: S j-,) l, P, C, at least 1 or more 002≦a, Q, 0.15 72≦X≦80 (0 ) Amorphous! ■For gold, the following composition is 1.
1,000 yen as stated in item 4. (Fe2-8Ma)xYloo-x M: Ti, )', Or, to4n, Ni
, Zr, Nb, M. 1, L u, ], 1. f, Ta, , W,
J.