JPS59132197A - Electronic circuit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic circuit that includes switching elements, and more particularly to an improved electronic circuit that reduces radiated noise.

In the electronic circuits that control switching circuits, large currents in the form of pulses rather than pure sine waves flow, so energy is not only propagated through preset lines, but also becomes electromagnetic radiation and is transmitted into space. The proportion of children cannot be ignored.

In particular, as the amount of information increases and the handling frequency becomes higher,
First, progress is being made in the direction of increasing the packaging density of circuits.

As this tendency increases, circuit malfunctions due to interference between adjacent circuits are becoming a problem. Furthermore, the energy leaking from the front electronic circuit may cause damage to external devices.

In addition to the above-mentioned electromagnetic radiation, noise emitted to the outside through the line is also an important problem.

It is known that the latter influence of line noise can be avoided by increasing the attenuation m of high frequencies in the noise filter in the line. On the other hand, in the case of the former type of radiated noise, there is no radiation in principle if the total curvature is closed tightly. This is undesirable because it reduces the cooling effect and seriously impairs reliability.Therefore, the current situation is that a certain amount of electromagnetic radiation must be allowed.

It goes without saying that the basic idea behind such noise removal is that it is most effective to remove it as close to the source as possible.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electronic circuit with a new structure that improves the drawbacks of the prior art described above and reduces noise radiation and unnecessary width.

In order to achieve the above object, the present invention provides an electronic circuit using switching elements, and the electronic circuit is constructed on a substrate on which magnetic ferrite plates 1 to 1 and other insulating base materials are planted. This is a characteristic feature.

In the present invention, J3 is used, and the clay material is N1.
- Soft fly of Zll type, Mn-711 type, 11+1-fVHI type, or C'U-Zll type] - What is more effective?

(The invention will be explained in detail by way of examples.)

Figure 1 shows an example of a conventional electronic circuit. (
tltii 11i side view, the metal case 1 with holes 4 for better ventilation is intended to shield the radiation noise generated from the printed circuit board 1 on which the switching element 3 is mounted. However, in an electronic circuit having such a structure, it is difficult to remove the noise 7 leaking to the outside from the ventilation hole 4, which is made to avoid improving the reliability of the components. )(゛There was.

FIG. 2 does not show an embodiment of the electronic circuit according to the present invention.
18 is an explanatory diagram of the configuration. The printed circuit board 2 on which the switching elements 3 are mounted 111 is a multilayer printed circuit board 5 in which an Ill-type semiconductor substrate and an insulating base material are laminated. In this embodiment, fly
An i-Zn type ferrite was used, and an epoxy type ferrite was used as an insulating layer. According to the electronic circuit of the present invention having the above configuration, the amount of noise leaking to the outside is extremely reduced.
1 shows the noise characteristics received.

Figure 3 shows another example of the structure of the electronic component according to the present invention. Figure 3 is a schematic cross-sectional view of an embodiment of the electronic component according to the present invention. It has a structure in which the wire is housed in a metal case 1 so that it can be used as an I unit. It is possible to reduce the radiation noise by 50% (less than Jf3).
Kinoko.

In general, the molding material used by Mokkomei has very good thermal conductivity, which significantly improves the reliability of the circuit by suppressing the temperature of the elements caused by localized heat generation in the circuit. There is an effect that can be used.

As explained above using the embodiments, by using the structure of the present invention in which an electronic circuit having a switching element is molded with a resin mixed with ferrite [V], it is possible to significantly reduce radiation noise and increase the (Since it is possible to realize a highly reliable electronic circuit, its industrial effects are great.

[Brief explanation of drawings]

Figure 1 is a sectional view showing an example of the structure of a conventional electronic circuit;
The figure shows one embodiment of an electronic circuit according to the present invention - schematic (1)
FIG. 3 shows another embodiment of the electronic circuit h'' 11 according to the present invention. 1: Metal case, 2: Pudding 1 to board, 3: Sinching element, 4: Ventilation hole, 5: Ferrite [・Plate second layer pudding 1]
~Resin mixed with board, G: Board mounting pin, 7: Radiation noise. Figure 7 Figure 3

Claims (1)

[Claims] 1. An electronic device characterized in that a switching element is constructed on a printed circuit board made of a laminated electronic circuit magnetic board and other insulating layers. circuit. 2. In the electronic circuit described in claim 1, the magnetic 14 ferrite 1 to material is Nr-z11 series,
An electronic circuit characterized by using Cu-Zll-based soft material