JPH0669680A - Structure of mounting electronic part - Google Patents

Abstract

PURPOSE:To suppress electromagnetic noise by surrounding an inverter module being an electromagnetic source and a control circuit separately with metals, and providing the input/output line of from the inverter module effectively with a capacitor or an inductor. CONSTITUTION:A circuit board is made a multilayer printed board 3, and shield layers 4a and 4b are provided at the lowermost layer or the uppermost layer, and high frequency module circuits 5a and 7 and control circuit 5b are arranged in the space surrounded by these shield layers 4a and 4b and a metallic casing 2, and besides a through capacitor 18, between the input line 23 from a high frequency circuit and a ground layer 17, on the power circuit 5a where the high frequency circuit module is mounted, and an inductor 26, in the output lines 24 and 28, are provided. Hereby, the radiative and conductive noise leaking from the inverter module is restrained, and the radiative noise from the control circuit 5b is also restrained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure of an electronic device such as an inverter device, which can prevent leakage of electromagnetic noise and improve assembly and serviceability.

[0002]

2. Description of the Related Art FIG. 3 is a sectional view showing an internal structure of a conventional mounting structure of an electronic device disclosed in Japanese Utility Model Laid-Open No. 26294/1990. In FIG. 1, reference numeral 1 is an electronic device, 2 is a case of the electronic device 1, 3 is a multilayer printed circuit board, 4 is a multilayer printed circuit board 3, and a shield layer 7 is disposed so as to be closest to the electromagnetic wave generation source 7. Is an electromagnetic wave generation source disposed in a space surrounded by the case 2 and the multilayer printed circuit board 3.

In the electronic device mounting structure configured as described above, the noise generated by the electromagnetic wave source 7 is excited by the pattern of the shield layer 4 provided on the multilayer printed circuit board 3 which is closest to the electromagnetic wave source 7. Therefore, the noise of the electromagnetic wave generation source 7 is shielded to the extent that it does not affect the signal line of the mounting portion.

[0004]

The conventional mounting structure for electronic equipment is configured as described above, and the noise excited by the electromagnetic wave source 7 is suppressed by the shield layer. Since it is connected to the circuit pattern on the printed circuit board, it has no means to suppress electromagnetic noise leaking from the input / output pattern or line to the power supply circuit and control circuit. No consideration is given to noise emitted from the device. Furthermore, since the electrical connection between the electromagnetic wave generation source 7 and the multilayer printed circuit board 3 is made by soldering or the like, mounting,
There was a problem that it was difficult to remove.

The present invention has been made to solve the above problems, and an object thereof is to obtain a noise prevention structure capable of suppressing the noise leaked to the electromagnetic wave generation source 7 and its surroundings. It is intended to provide an assembling method.

[0006]

According to a first aspect of the present invention, there is provided a mounting structure for electronic equipment, for example, a multilayer printed circuit board is separated into a power supply circuit to which an electromagnetic wave generation source is attached and a control circuit for controlling the power supply. The circuit pattern surface of the circuit and the shield layer are arranged so that the front and back sides are opposite to those in the case of the power supply circuit, and have the following elements. (A) an electromagnetic wave source for generating an electromagnetic wave; (b) a substrate having the following elements; (b1) an electromagnetic wave source circuit section provided on a part of one surface of the substrate for operating the electromagnetic wave source. (B2) The control circuit section provided on the other surface of the substrate where the electromagnetic wave generation source circuit section is not provided for performing control different from that of the electromagnetic wave generation circuit section, (b3) the electromagnetic wave Shield layers provided on the other surface of the substrate corresponding to the source circuit section and the control circuit section, respectively, for suppressing electromagnetic waves from the electromagnetic wave source, and (b4) connected to the shield layer to control the electromagnetic wave source. A case that electromagnetically shields the circuit section from the outside.

The mounting structure of the electronic device according to the second invention is
For example, a multilayer printed circuit board is separated into a power supply circuit to which an electromagnetic wave generation source is attached and a control circuit for controlling the power supply, and the electromagnetic wave generation source and the control circuit are individually shielded by a case and a shield wall of the case. .

The mounting structure of the electronic device according to the third invention is
For example, a multilayer printed circuit board is provided with a feedthrough capacitor between the input line of the electromagnetic wave generation source and the shield layer on the circuit pattern surface of the power supply circuit, and an inductor is provided in the output line of the electromagnetic wave generation source, It has the following elements. (A) an electromagnetic wave source for generating an electromagnetic wave; (b) a substrate having the following elements; (b1) an input section, an output section, an input terminal and an output terminal for the electromagnetic wave source, and the electromagnetic wave source operates. An electromagnetic wave generation source circuit provided on one surface of the substrate for (b2) a shield layer provided on the other surface of the substrate for suppressing electromagnetic waves from the electromagnetic wave generation source,
(C) A capacitor connected between the input section and the input terminal and having a capacitance between the shield layer, and (d) an inductor connected between the output section and the output terminal.

The mounting structure of the electronic device according to the fourth invention is
The connection method between the multilayer printed circuit board and the electromagnetic wave generation source comprises a plug terminal penetrating the printed circuit board to the terminal on the multilayer printed circuit board side, and the electromagnetic wave generation source side is configured by a connecting means equipped with an outlet terminal, It has the following elements. (A) an electromagnetic wave source for generating an electromagnetic wave; (b) a substrate having a circuit for generating an electromagnetic wave using the electromagnetic wave source; and (c) a connecting means for detachably connecting the electromagnetic wave source and the substrate.

[0010]

In the first aspect of the invention, since the circuit pattern surface of the control circuit portion and the shield layer are arranged to be opposite to those of the electromagnetic wave generation source circuit portion, the electromagnetic induction of the electromagnetic wave generation source to the control circuit portion is prevented. The influence of the world can be suppressed. Further, by connecting the case to the shield layer, the control circuit is electromagnetically shielded from the outside by the electromagnetic wave generation source inside the chamber formed by the case and the shield layer.

In the second invention, the noise leaking from the electromagnetic wave generation source to the control circuit is electromagnetically shielded by the shield layer and the shield wall, and the leakage of the electromagnetic wave noise is suppressed by these.

In the third aspect of the invention, the electromagnetic wave noise leaking from the input section to the power supply side is bypassed to the shield layer by the feedthrough capacitor penetrating the input line of the electromagnetic wave generation source, and output by the inductor provided in the output section. Noise that wraps around the input section to the input section is suppressed.

In the fourth aspect of the invention, for example, the electromagnetic wave source and the multilayer printed circuit board can be freely attached and detached by connecting means such as a plug terminal mounted on the multilayer printed circuit board and an outlet terminal mounted on the electromagnetic wave generating source. Assembly,
Work at the time of service becomes easy.

[0014]

EXAMPLES Example 1. 1 and 2 show an embodiment of the present invention, in which 1 is an electronic device (inverter device) of the present invention,
Reference numeral 2 denotes a metal case that constitutes the electronic device 1, 3 denotes the electronic device 1, a multilayer printed circuit board electrically fixed to the case 2, 4 a constitutes the multilayer printed circuit board 3, and the power circuit pattern surface 5 a A shield layer provided on the lowermost layer and close to the electromagnetic wave generation source 7 constitutes the multilayer printed circuit board 3, and is a shield layer provided opposite to the control circuit pattern surface 5b and on the same plane as the power circuit pattern surface 5a, Reference numeral 5a is a power supply circuit pattern surface which constitutes the power supply circuit on the surface which constitutes the multilayer printed circuit board 3 and is opposite to the shield layer 4a, and 5b.
Is a multilayer printed circuit board 3 and has a power circuit pattern surface 5
a control circuit pattern surface constituting a control circuit on a surface contradictory to a, 6 an insulating substrate for electrically insulating the shield layers 4a, 4b and circuit pattern surfaces 5a, 5b, and 7 a power circuit pattern surface 5a An electromagnetic wave source such as an inverter module that is electrically connected to and electrically contacts the case 2 to supply a high frequency output, and 8 constitutes a bottom surface of the electromagnetic wave source 7 and is electrically and thermally connected to the case 2. A metal chassis for electrically contacting with each other, 9 is a module substrate mounted on the metal chassis 8, 10 is a power element arranged on the module substrate 9, and combined with a circuit configuration as shown in FIG. Power element 1 embedded in source 7
A lead wire connected to the input of 0, 12 is an output lead wire embedded in the electromagnetic wave generation source 7 and connected to the output of the power element 10, and 13 constitutes the electromagnetic wave generation source 7, and the module substrate 9
A plastic case surrounding the housing, 14 is an outlet terminal embedded in the plastic case 13 and electrically connected to the input lead wire 11, 15 is an outlet terminal embedded in the plastic case 13 and electrically connected to the output lead wire 12, and 16 is an insulation Through holes that penetrate the substrate 6 and electrically connect the shield layer 4a to the power circuit pattern surface 5a; 17 is a spot ground provided on the power circuit pattern surface 5a and electrically connected to the through hole 16; and 18 is a spot. A feedthrough capacitor that is electrically connected to the ground 17 and has a capacitance between the ground and the ground as shown in FIG.
Reference numeral 20 is a circuit pattern that constitutes the power supply circuit pattern surface 5a, 21 is a lead terminal that is electrically fixed to the circuit pattern 19, one of which is protruding from both ends of the feedthrough capacitor and the other is the circuit pattern 20, and 22 is the circuit pattern 19 Plug terminals which are electrically and mechanically fixed to the multilayer printed circuit board, penetrate through the insulating substrate 6 of the multilayer printed circuit board, are electrically connected to the outlet terminals 14 and are detachably inserted, and 23 is the circuit pattern 20.
Input lines for electrically connecting to the power supply line outside the case, and 24 and 25 are power circuit pattern surface 5a.
Circuit pattern that constitutes the
4, the other is electrically connected to the circuit pattern 25, and an inductor having an inductance in the output line as shown in FIG.
27 is a plug terminal that is electrically and mechanically fixed to the circuit pattern 24, penetrates the insulating substrate 6 to be electrically connected to the outlet terminal 15, and is detachably inserted; 28 is connected to the circuit pattern 25; An output connection line 29 for connecting to a load line outside the body, 29 constitutes the case 2, is located at the connection portion of the shield layers 4a and 4b, and is electrically connected to these to control the electromagnetic wave generation source 7 and the electromagnetic wave generation source 7. It is a shield wall that partitions the circuit pattern surface 5b.

In this embodiment, the electromagnetic wave noise generated from the inverter device is mainly due to conduction and radiation noise from the inverter module body which is the electromagnetic wave generation source and radiation noise from the control circuit. The inverter module and the control circuit are separately surrounded by metal. That is, the circuit board is the multilayer printed board 3, the shield layers 4a and 4b are provided in the lowermost layer or the uppermost layer, and an inverter module (high frequency circuit module) is provided in a space surrounded by the shield layers 4a and 4b and the metal housing 2. And a control circuit.

That is, in the mounting structure of the inverter device according to this embodiment, the power supply circuit of the multilayer printed circuit board 3 is provided on the power supply circuit pattern surface 5a and the shield layer 4a, and the control circuit is provided on the control circuit pattern surface 5b and the shield layer 4b. By separating each of them, the influence of the induction electromagnetic field on the control circuit of the electromagnetic wave generation source 7 is somewhat suppressed, and further, by being individually shielded by the shield wall 29, it is significantly suppressed. Further, since electromagnetic wave noise leaking from the electromagnetic wave generation source 7 to the control circuit due to conduction and radiated from the circuit pattern surface 5b or the mounted component is confined in the space surrounded by the shield layer 4b, the case 2 and the shield wall 29,
Radiation to the outside of the case can be suppressed.

Further, the electromagnetic wave noise leaking to the circuit pattern 19 at the input of the electromagnetic wave generation source 7 is prevented from passing through the through capacitor
Since it is bypassed by the shield layer 4a by the shield layer 4a, the leakage to the input connection line 23 can be suppressed, and the electromagnetic noise leaking to the output circuit pattern 24 is blocked by the inductor 26, so that the leakage to the output connection line 28 can be suppressed. ,
As a result, all the electromagnetic waves leaking to the outside of the case 2 will be suppressed. In addition, the connection between the multilayer printed circuit board 3 and the electromagnetic wave generation source 7 can be easily performed only by inserting / removing the outlet terminals 22 and 27 and the plug terminals 14 and 15, so that the work at the time of assembly and service becomes easy.

As described above, this embodiment is characterized in that one layer of the multilayer printed circuit board closest to the electromagnetic wave source housed in the case is used for the purpose of suppressing noise from the electromagnetic wave source. In the mounting structure of, the multi-layer printed circuit board is separated into the electromagnetic wave generation source circuit section and the control circuit section of the electromagnetic wave generation source, and the circuit pattern surface of the printed circuit board of the control circuit section and the shield layer are opposite to those of the electromagnetic wave generation source section. Further, a through capacitor is provided between the input section and the shield layer of the electromagnetic wave generation source section on the printed circuit board, and an inductor is provided between the output section and the output terminal of the electronic device.

Further, a shield wall for electromagnetically shielding the electromagnetic wave generation source and the control circuit on the multilayer printed circuit board is provided in a part of the case, and the shield wall is joined to the shield layer. To do.

Further, in the structure for connecting the feedthrough capacitor or inductor of the printed circuit board and the electromagnetic wave source, the plug terminal penetrating the circuit to the feedthrough capacitor side terminal or the inductor side terminal on the printed circuit board of the connection terminal portion, or the electromagnetic wave. It is characterized in that an outlet terminal is provided on the source side.

Example 2. In the first embodiment described above, the case where the multilayer printed circuit board is separated into the electromagnetic wave generation source circuit section and the control circuit section of the electromagnetic wave generation source is shown. However, the control circuit section only has a circuit for controlling the electromagnetic wave generation source. Without
It does not matter even if it has other control circuits.

Example 3. In the first embodiment, the case of the inverter device is shown, but the electromagnetic wave generation source for generating the electromagnetic wave may be not only an inverter but also a case where other electromagnetic waves such as a power source are generated. Further, the same effect as that of the above-described embodiment can be obtained even in the case where a device that does not generate electromagnetic waves for the purpose does not have to generate the electromagnetic waves secondarily.

Example 4. Although the case where the shield layer is present in both the electromagnetic wave generation source circuit section and the control circuit section has been described in the above-mentioned first embodiment, the shield layer need not be present in both the power supply circuit section and the control circuit section. , It does not matter even if it exists only on one side. Alternatively, it does not matter if it does not exist.

Example 5. In the first embodiment described above, the terminal on the printed circuit board side is provided with the plug terminal and the outlet terminal is provided on the electromagnetic wave generation source side. On the contrary, the outlet terminal is provided on the printed circuit board side and the electromagnetic wave generation source side is provided. It does not matter even if a plug terminal is provided. Furthermore, it does not matter even if a connection method other than the plug terminal or the outlet terminal is adopted. However, even in that case, the printed circuit board and the electromagnetic wave generation source must be detachably connected.

Example 6. In the above-described first embodiment, the case where the multilayer printed circuit board is used has been described, but the printed circuit board does not need to be multilayer, and may be simply the printed circuit board. Alternatively, it does not have to be a printed substrate, and may be a wiring substrate wired on a normal substrate.

[0026]

As described above, according to the electronic device mounting structures of the first to third inventions, the mounting substrate is a multi-layer printed circuit board, the power supply circuit section and the control circuit section are separated on the board, and In addition to dividing by the shield wall, the shield layer should be the bottom layer of the multilayer printed circuit board in the power circuit section and the top layer in the control circuit section, and the feed-through capacitor should be provided between the input line and the shield layer of the electromagnetic wave generation source and the inductor in the output line. With this configuration, it is possible to suppress electromagnetic noise that leaks out of the case.

Further, according to the mounting structure of the electronic device of the fourth aspect of the invention, since the connecting portion between the multilayer printed circuit board and the electromagnetic wave generating source has a detachable structure, assembly, service and the like are facilitated.

[Brief description of drawings]

FIG. 1 is a structural cross-sectional view showing a mounting structure of an electronic device according to an embodiment of the present invention.

FIG. 2 is a circuit diagram showing an electromagnetic wave generation source and its input / output lines in FIG.

FIG. 3 is a front structural cross-sectional view showing a conventional electronic device mounting structure.

[Explanation of symbols]

 1 Electronic Equipment (Inverter Device) 2 Case 3 Multilayer Printed Circuit Board 4 Shield Layer 5a Power Circuit Pattern Surface 5b Control Circuit Pattern Surface 6 Insulation Board 7 Electromagnetic Wave Source 8 Metal Chassis 9 Module Board 10 Power Element 11 Input Lead Wire 12 Output Lead Wire 13 Plastic Case 14 Outlet Terminal 15 Outlet Terminal 16 Through Hole 17 Spot Ground 18 Feedthrough Capacitor 19 Circuit Pattern 20 Circuit Pattern 21 Lead Terminal 22 Plug Terminal 23 Input Connection Wire 24 Circuit Pattern 25 Circuit Pattern 26 Inductor 27 Plug Terminal 28 Output Connection Wire 29 Shield wall

Front Page Continuation (72) Inventor Mitsuhiko Kanda 2-14-40 Ofuna, Kamakura City Mitsubishi Electric Corporation Life Systems Research Center

Claims (4)

[Claims] 1. A mounting structure of an electronic device having the following elements: (a) an electromagnetic wave generation source for generating an electromagnetic wave; (b) a substrate having the following elements: (b1) a substrate for operating the electromagnetic wave generation source. An electromagnetic wave generation source circuit portion provided on a part of one surface, and (b2) an electromagnetic wave generation source circuit portion is provided on the other surface of the substrate for performing control different from that of the electromagnetic wave generation source circuit portion. (B3) a shield layer for suppressing electromagnetic waves from the electromagnetic wave generation source, which is provided on a portion of the other surface of the substrate corresponding to the electromagnetic wave generation source circuit section and the control circuit section, respectively. b4) A case which is connected to the shield layer and electromagnetically shields the electromagnetic wave generation source and the control circuit unit from the outside. 2. The electronic device mounting structure according to claim 1, wherein the case includes a shield wall connected to the shield layer between the electromagnetic wave generation source and the control circuit unit. Implementation structure of. 3. A mounting structure of an electronic device having the following elements: (a) an electromagnetic wave generation source for generating an electromagnetic wave; (b) a substrate having the following elements; (b1) an input section, an output section, and the electromagnetic wave generation source. An electromagnetic wave generation circuit having an input terminal and an output terminal for operating the electromagnetic wave generation source, the electromagnetic wave generation circuit being provided on one surface of the substrate; and (b2) suppressing the electromagnetic wave from the electromagnetic wave generation source on the other side of the substrate. A shield layer provided on the surface, (c) a capacitor connected between the input section and the input terminal and having a capacitance between the shield layer, and (d) an inductor connected between the output section and the output terminal. . 4. A mounting structure for an electronic device having the following elements: (a) an electromagnetic wave source for generating an electromagnetic wave; (b) a substrate having a circuit for generating an electromagnetic wave using the electromagnetic wave source; (c) the electromagnetic wave. Connection means for detachably connecting the source and the substrate.