JPH0342672Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to the structure of variable layerable composite components, and in particular to the structure of conductor patterns of current-controlled variable multilayer inductors and multilayer capacitors. be.

[Prior art and its problems]

The demand for miniaturization of electronic components is no exception for inductance elements, and one way to meet this demand is to laminate magnetic layers and conductor layers by screen printing, etc., without using windings, to create a coil inside the magnetic body. There are laminated inductors that form patterns. Composite parts such as LC filters that utilize this are also used.

In order to make the inductance variable in laminated composite parts using such laminated inductors, a magnetic core is inserted in the center of the conductor pattern, but the mechanical strength may be impaired or the variable range There is a problem with not being able to get enough. In addition, there is an increasing demand for inductance elements whose inductance value can be varied not only by a magnetic core but also by an electric current.

[Purpose of invention]

The present invention aims to meet the above requirements and provides an LC composite component using a laminated inductor whose inductance value can be varied depending on the current.

[Means for solving problems]

The present invention achieves the above objectives by utilizing the coupling of two inductors formed in a sanderch structure in which three inductors are stacked in the stacking direction using a conductor pattern in the form of a figure 8 with a closed magnetic structure, and the inductors at both ends are connected in series. It is something to be achieved.

In other words, in a variable laminated composite component that has a conductor pattern forming a plurality of inductors and a conductor pattern forming a capacitor in a substrate, one conductor pattern alternately goes around two predetermined points in the magnetic body, and Three laminated inductors are formed that intersect with each other through a magnetic layer at a position midway between the two points, and the inductors at both ends of the three laminated inductors stacked in the lamination direction are connected in series, and the other conductor pattern is connected in series. are arranged facing each other with a dielectric material in between, and are characterized in that an inductor and a capacitor are integrally formed.

This creates a coupling between the inductors at both ends and the two inductors sandwiched between them, and the magnetic field generated by the bias current applied to one inductor changes the inductance value of the other inductor, causing the LC complex. This allows the resonant frequency of the components to be varied.

[Example of idea]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a perspective view of a conductor pattern portion of an embodiment of the present invention. Conductor patterns 11a, 11
Both b and 11c are in a magnetic layer such as ferrite, and a laminated inductor is obtained by laminating magnetic paste and conductive paste while alternately printing them and sintering them together.

The three conductor patterns 11a, 11b, and 11c are all laminated with patterns formed in a figure 8 shape connected to each other. In other words, they orbit around two different points in a figure-eight pattern, and intersect at a position midway between the two points. Therefore, the two parts of the conductor pattern are oriented in opposite directions, and when energized, the magnetic fields generated in the two parts are in opposite directions. Together with the magnetic layers formed above and below the conductive pattern, a complete closed magnetic path is formed.

The three conductor patterns 11a, 11b, and 11c all surround the same point and have a structure in which three conductor patterns are stacked in the stacking direction. Therefore, the structure is similar to that of coils wound around two common magnetic cores. As a result, three conductor patterns 11a,
The magnetic path formed by 11b and 11c forms a closed magnetic path together with the upper and lower magnetic layers.

Then, two conductor patterns 12 are placed on the same board.
A and 12b are formed to face each other with a dielectric layer in between, and a capacitor is integrally formed.

Conductor patterns 11a and 11c are connected in series, and conductor pattern 11b is insulated from them. As a result, two conductor patterns 11
Two coils are formed: a coil formed by a and 11c and a coil formed by the conductor pattern 12b sandwiched between them. Although these are independent inductors, they are magnetically coupled because they are coils wound around the same magnetic core. FIG. 2 shows this in a circuit diagram.

One of the two coils, consisting of the conductor patterns at both ends and the conductor pattern in the center, becomes the original inductor, and the other becomes the control inductor. Since the magnetic field generated by the bias current applied to the control inductor passes through the original magnetic path of the inductor, this magnetic field causes a change in the inductance value. Utilizing this, the inductance value of the inductor can be made variable by the current applied to the control inductor.

An LC circuit is constructed by connecting the variable inductor and capacitor formed in this way in series or in parallel. This LC circuit can be used as an LC resonant circuit with a variable inductor as shown in FIG.

The terminals of the inductor and capacitor may be connected by extending them to the end surface of the board, or may be connected internally. Connecting internally limits the applications, but it has the advantage of reducing the number of terminals.

The number of turns of the conductor pattern can be arbitrarily set depending on the application. Further, an intermediate tap or the like may be provided in the inductor portion.

[Effect of idea]

According to the present invention, the inductance value of the inductor can be made variable by utilizing the magnetic coupling between the two inductors, thereby making it possible to change the characteristics of the LC circuit.

Since it is not mechanically variable as in conventional methods, it is not only possible to have a wide variable range, but also advantageous in terms of yield and reliability.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a conductor pattern in an embodiment of the present invention, and FIGS. 2 and 3 are equivalent circuit diagrams thereof. 11, 12... Conductor pattern.

Claims (1)

[Scope of utility model registration request] In a variable laminated composite component that has a conductor pattern that forms a plurality of inductors and a conductor pattern that forms a capacitor in a substrate, one conductor pattern alternately goes around two predetermined points in the magnetic body, and Three figure-8-shaped laminated inductors are formed that intersect with each other through a magnetic layer at an intermediate position, and the inductors at both ends of the three laminated inductors stacked in the lamination direction are connected in series, and the other conductor is connected in series. A variable laminated composite component characterized in that the patterns are arranged to face each other with a dielectric material in between, and the inductor and capacitor are integrally formed.