JPH07201606A - Electronic device and power supply employing it - Google Patents

Abstract

PURPOSE:To reduce the space required for dealing with noise by laminating a first metal foil, an insulating material and a second metal foil so that the metal foils serve as shielding materials thereby clearing safety regulations with a single device. CONSTITUTION:A multi-function shield barrier 10 comprises a metal foil 11, an insulator 12, and a metal foil 13. The metal foils 11 and 13 are applied to the opposite sides of the insulator 12. A capacitance appears between the metal foils 11 and 13 depending on the permittivity of the insulator 12 thus providing the function of capacitor. The metal foils 11 and 13 also serve as a magnetic shield. This structure provides the function of line bypass capacitor and magnetic shield.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic component used for noise countermeasures such as a switching power supply and a power supply device using the electronic component.

[0002]

2. Description of the Related Art In recent years, with the miniaturization of electronic equipment, there is a tendency for the power supply devices used therein to be miniaturized. on the other hand,
In the power supply device, the normal mode noise that generates and conducts a voltage between the power supply lines and the potential between the power supply lines are the same, but the common mode noise that generates and conducts the potential in the layer with the ground occurs. That measure is necessary. For example, as shown in FIG. 7, the switching power supply device includes a rectifier circuit 1 for converting an AC input into DC, a primary side circuit 2 for switching this DC voltage to convert into an AC pulse, and an AC pulse for a secondary side. It is composed of an insulation transformer 3 for converting and outputting to a secondary side circuit 4, and an output circuit 5 for converting an AC voltage into a DC voltage and outputting it as a power supply voltage for electronic devices. Four line bypass capacitors 6 are connected between the GND lines of the circuit 2 and the secondary side circuit 4.

[0003]

As described above, according to the conventional safety regulations, three line bypass capacitors must be connected in series, and as a countermeasure against noise, another line bypass capacitor is required. Since it is necessary to use four bypass capacitors,
In the switching power supply device, there is a problem that the space occupied by the line bypass capacitor is large.

The present invention has been made by paying attention to the above problems, and can meet the safety standard with one component,
An object of the present invention is to provide an electronic component that can reduce the space that it has for noise suppression and a power supply device that uses the electronic component.

[0005]

An electronic component according to claim 1 of the present application is a first metal foil, a second metal foil, and a space between these first and second metal foils. The first metal foil, the insulating material, and the second metal foil are laminated. This electronic component can use metal foil as a shield material, and
Since the metal foil, the second metal foil, and the insulating material can be used as a space-saving noise countermeasure component, they can be used as components having multiple functions.

According to a second aspect of the present invention, in the electronic component according to the first aspect, the insulating material is an insulating film, and a joint surface of the first or second metal foil with the insulating film. The second insulating film is formed on a surface different from that of the above, and the second insulating film is attached to the support through the second insulating film, so that a small and thin electronic component can be realized. But you can install it freely.

In the electronic component according to the third aspect, the first metal foil, the insulating layer, and the second metal foil are sequentially laminated on the substrate. Therefore, the first and second metal foils are formed. By connecting one side of the foil to the primary side GND and the other side to the secondary side GND, the effect of the line bypass capacitor and the current shield can be obtained. You can effectively use the space.

The power supply device according to a fourth aspect of the present invention includes a transformer having a primary side and a secondary side insulated from each other,
A first metal foil, a second metal foil, and an insulating material provided between the first and second metal foils, and the first metal foil, the insulating material, and the second metal foil are laminated. The electronic component is used as a line bypass capacitor connected to the primary side and the secondary side.

In this power supply device, since the first or second metal foil functions as a shield case and also as an electrode of the line bypass capacitor, no special capacitor is required and the space saving effect is enhanced.

[0010]

The present invention will be described in more detail with reference to the following examples. FIG. 1 is a partial sectional view of an electronic component (multifunctional shield barrier) according to an embodiment of the present invention. In FIG. 1, the multi-functional shield barrier 10 is composed of a metal foil 11, an insulator 12, and a metal foil 13, and the metal foils 11 and 13 are provided on both surfaces of the insulator 12. The material of the metal foils 11 and 13 is aluminum, copper or the like, and the insulator 12 is polycarbonate, vinyl chloride or the like.

The operation of the multi-function shield barrier 10 thus constructed will be described below. Due to the dielectric constant of the material of the insulator 12 in FIG. 1, capacitance is generated in the metal foils 11 and 13 to function as capacitors, and the metal foils 11 and 13 also operate as electromagnetic shields. As described above, according to this embodiment, as shown in FIG. 1, the metal foils 11 and 13 are provided on both surfaces of the insulator 12, and one of the foils is used as the primary side GN.
D by connecting the other side to the secondary side GND,
The effect of the line bypass capacitor and the electromagnetic shield can be obtained, and the space of the conventional line bypass capacitor can be effectively used for other purposes.

FIG. 2 is a perspective view of a switching power supply showing an example of use of the multifunctional shield barrier shown in FIG. 1, which is a switching power supply 16 including a circuit board 14 and electric parts 15.
Although not shown, the outer side of the multi-function shield barrier 17 is covered with an outer case. Although the switching power supply 16 is surrounded by the multifunction shield barrier 17 in FIG.
It may be partially surrounded by a multifunctional shield barrier.

In the first embodiment, the effect of the line bypass capacitor and the electromagnetic shield is used, but the effect of the heat sink can also be obtained. Next, a second embodiment of the electronic component (line bypass wheel) of the present invention will be described.
FIG. 3 is a perspective view showing the configuration of the embodiment line bypass wheel. In FIG. 3, the line bypass foil 20
Is a metal foil 21 and an insulating film 22 that are sequentially laminated.
And a metal foil 23 and an insulating film 24. As the insulating films 22 and 24, ones each having a three-layered structure are used. 1 is the same as that of FIG. 1 except that the insulating film 24 is formed on the surface of the metal foil 23 (the surface opposite to the bonding surface of the insulating film 22). Further, a point different from FIG. 1 is that a metal foil and an insulating film are wound around the substrate 25.

Next, the operation of the line bypass wheel 20 thus constructed will be described below. With the configuration of the metal foil 21, the insulating film 22, the metal foil 23, and the insulating film 24 of FIG.
It is completely insulated by the insulating film 22, and a capacitance is generated between the metal foils 21 and 23 due to the dielectric constant of the insulating film 22. Further, even if the insulating film 24 is wound around the substrate 25, the metal foils 21 and 23 are insulated, and the dielectric constant of the insulating film 24 also causes capacitance. By adding the insulating film 24 and winding the insulating film 24 around the substrate 25 as described above, double the capacitance can be obtained even if the areas of the metal foils 21 and 23 are the same.
It can be made compact.

In the second embodiment, the support is wound around the substrate, but the support may be formed of a dedicated bobbin or other material, and it is flexible like a flexible substrate and has a free shape. You may arrange in. FIG. 4 is a plan view showing an example of use of the line bypass foil shown in FIG. 3, and when the electric component 27 is mounted on the circuit board 26,
This is an example in which a line bypass foil 28 is arranged in the vicinity of the electric component 27, and a line bypass wheel 29 having elasticity like a flexible substrate is arranged along the outer shape of the electric component 27. The line bypass wheel 29 type can be freely shaped by arranging other electric components.

FIG. 5 is a sectional view of an electronic component (line bypass substrate) according to a third embodiment of the present invention. In FIG. 5, the line bypass substrate 30 is configured by laminating a conductor pattern (metal foil) 31, three insulating layers 32, a conductor pattern (metal foil) 33, and a substrate 34 in this order from the upper layer. This configuration is similar to that of FIG.
The difference from the configuration of FIG. 1 is that the substrate 34 used for the circuit pattern is used and the insulating layer 32 is formed by the conductor patterns 31 and 33.
The point is that they are sandwiched between.

Next, the operation of the line bypass board 30 constructed as described above will be described below. The conductor patterns 31 and 33 are completely insulated by the insulating layer 32, and a capacitance is generated between the conductor layers 31 and 33 due to the dielectric constant of the insulating layer 32. By connecting one of the conductor patterns 31 and 33 to the primary side GND and the other to the secondary side GND, the effect of the line bypass capacitor and the electromagnetic shield can be obtained, and the space of the conventional line bypass capacitor can be obtained. Can be effectively used.

Further, in the third embodiment, the insulating layer is sandwiched, but the substrate may be treated as the insulating layer so as to meet the safety standard. Furthermore, although the effect of the electromagnetic shield of the line bypass capacitor is used, the effect of the heat sink can also be obtained. FIG. 6 is a sectional view showing a usage example of the line bypass substrate shown in FIG. Here, the circuit board 44
An electric component 46 is mounted on top of the
5 and further has a conductor layer 43 and an insulating layer 4 on the upper layer.
2, the conductor layer 41 is formed.

[0019]

As described above, according to the present invention, by providing the metal foils on both sides of the insulator, it is possible to have a plurality of functions with one component, and the conventional line bypass capacitor. Then, although there is a restriction on the layout due to the safety standard, the present invention can solve this point, and an excellent effect can be obtained.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of an electronic component according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a usage example of the electronic component of the embodiment.

FIG. 3 is a perspective view showing an electronic component according to another embodiment of the present invention.

FIG. 4 is a plan view showing a usage example of the electronic component of the embodiment.

FIG. 5 is a sectional view showing an electronic component according to another embodiment of the present invention.

FIG. 6 is a cross-sectional view showing a usage example of the electronic component of the embodiment.

FIG. 7 is a circuit block diagram of a switching power supply device using a line bypass capacitor.

[Explanation of symbols]

 10 Multifunctional shield barrier 11 Metal foil 12 Insulator 13 Metal foil

Claims (4)

[Claims] 1. A first metal foil, a second metal foil, and an insulating material provided between the first and second metal foils. The first metal foil, the insulating material, and the second metal foil. An electronic component comprising a stack of metal foils. 2. The insulating material is an insulating film, and a second insulating film is formed on a surface of the first or second metal foil different from a surface to be joined with the insulating film, and the second insulating film is formed. The electronic component according to claim 1, wherein the electronic component is attached to the support through a film. 3. An electronic component comprising a first metal foil, an insulating layer and a second metal foil which are sequentially laminated on a substrate. 4. A power supply device including a transformer in which a primary side and a secondary side are insulated, a first metal foil and a second metal foil,
An electronic component made of an insulating material provided between the first and second metal foils and having the first metal foil, the insulating material, and the second metal foil laminated is provided on the primary side and the secondary side. A power supply device characterized by being used as a connected line bypass capacitor.