TW201515564A - Electronic device capable of reducing electromagnetic interference - Google Patents

Abstract

An electronic device includes a plurality of print circuit boards. The print circuit boards include at least one mother board and at least one daughter board. The mother board is electrically connected to the daughter board via a cable. The cable includes a first end and a second end, the first end is connected to the mother board, and the second end is connected to the daughter board. The electronic device further includes a first filter element arranged on the mother board and a second filter element arranged on the daughter board. The first filter element is connected between the first end of the cable and the ground. The second filter element is connected between the second end of the cable and the ground.

Description

Electronic device capable of reducing electromagnetic radiation

The present invention relates to an electronic device that reduces electromagnetic radiation.

At present, electronic devices and devices generally use a plurality of circuit boards to jointly perform the overall function operation, wherein the circuit boards include a motherboard and a plurality of daughter boards, and the motherboard and the daughter boards are generally connected by a connecting line. However, in the process of transferring data between the motherboard and the daughter board through the connection line, it is easy to generate electromagnetic radiation on the connection line, thereby adversely affecting electromagnetic interference in the electronic components in the electronic device.

In view of the above, it is necessary to provide an electronic device capable of reducing electromagnetic radiation, which can reduce electromagnetic radiation generated by a connection line between a motherboard and a daughter board of an electronic device.

An electronic device comprising a plurality of printed circuit boards, wherein the printed circuit boards are respectively a mother board and a daughter board, the mother board and the daughter board being electrically connected by a connecting line, wherein the connecting line comprises a first end and a second end, The first end is electrically connected to the motherboard, and the second end is electrically connected to the daughter board. The electronic device further includes a first filter component disposed on the motherboard and a second filter component disposed on the daughter board, the first filter component being coupled between the first end of the connection line and the ground, the second filter The component is connected between the second end of the connecting line and the ground.

The first filter element and the second filter element included in the electronic device of the present invention absorb electromagnetic radiation generated by a connection line between the mother board and the daughter board, and the first filter element and the second filter element are respectively located at the connection line. At both ends, the effect of double filtering is achieved, so that the effect of reducing electromagnetic radiation on the connecting line is enhanced.

100‧‧‧Electronic devices

101‧‧‧Printed circuit board

10‧‧‧ Motherboard

20‧‧‧Slate

30‧‧‧Connecting line

301‧‧‧ first end

302‧‧‧ second end

40‧‧‧First filter element

50‧‧‧Second filter element

1 is a perspective view of an electronic device capable of reducing electromagnetic radiation according to an embodiment of the present invention.

The electronic device capable of reducing electromagnetic radiation in the present invention will be further described in detail below with reference to the accompanying drawings.

Referring to FIG. 1 , in a preferred embodiment of the present invention, the electronic device 100 includes a plurality of printed circuit boards 101 , wherein the printed circuit boards 101 are respectively a mother board 10 , a plurality of daughter boards 20 , and the like. In the present embodiment, the electronic device 100 includes a mother board and a daughter board 20 as an example for description. The electronic device 100 further includes a connection line 30 electrically connecting the motherboard 10 and the daughter board 20, a first filter component 40 disposed on the motherboard 10, and a second filter component 50 disposed on the daughter board 20.

The connection line 30 includes a first end 301 and a second end 302. The first end 301 is electrically connected to the motherboard 10, and the second end 302 is electrically connected to the sub-board 20. The first filter element 40 is connected between the first end 301 of the connection line 30 and the ground, and the second filter element 50 is connected between the second end 302 of the connection line 30 and the ground.

In the present embodiment, the first filter component 40 is a filter capacitor C1. One end of the filter capacitor C1 is connected to the first end 301 of the motherboard 10 connected to the connection line 30, and the other end is grounded. In the present embodiment, the number of the filter capacitors C1 is the same as the number of the connecting lines 30, and the first end of each of the connecting lines 30 is connected to a filter capacitor C1. In another embodiment, the first filter component 40 can also be an electromagnetic compatibility filter (EMC filter), and the electromagnetic compatibility filter is connected to the connection line 30 and connected to the motherboard. The number of EMC filters is the same as the number of connection lines 30 between the first end 301 and the ground on the 10, and the first end of each connection line 30 is connected to an EMC filter. In other embodiments, the first filter component 40 may also be other filter components having a function of filtering out electromagnetic waves, and the number of the first filter components 40 may be set to different values as needed.

In the present embodiment, the second filter component 50 disposed on the sub-board 20 is an EMC filter connected between the second end 302 of the connection line 30 on the sub-board 20 and the ground. In another embodiment, the second filter component 50 is a filter capacitor, one end of the filter capacitor is connected to the second end 302, and the other end is grounded. In other embodiments, the first filter component 40 may also be another filter component having a function of filtering out electromagnetic waves. The number of the first filter components 40 may be the same as the number of the connection lines 30, or may be set to be different according to requirements. value.

The first filter element 40 and the second filter element 50 are configured to absorb electromagnetic radiation generated by the connection line 30 between the motherboard 10 and the daughter board 20, and the first filter element 40 and the second filter element 50 are respectively located at the connection line 30. Both ends have a double filtering effect, so that the effect of reducing electromagnetic radiation on the connecting line 30 is enhanced.

While the preferred embodiment of the invention has been shown and described, it will be understood Therefore, it is intended that the invention not be limited to the embodiments disclosed herein,

no

100‧‧‧Electronic devices

101‧‧‧Printed circuit board

10‧‧‧ Motherboard

20‧‧‧Slate

30‧‧‧Connecting line

301‧‧‧ first end

302‧‧‧ second end

40‧‧‧First filter element

50‧‧‧Second filter element

Claims (7)

An electronic device comprising a plurality of printed circuit boards, wherein the printed circuit boards are respectively a mother board and a daughter board, the mother board and the daughter board being electrically connected by a connecting line, wherein the connecting line comprises a first end and a second end, The first end is electrically connected to the motherboard, and the second end is electrically connected to the sub-board. The improvement is that the electronic device further includes a first filter component disposed on the motherboard and a second filter component disposed on the daughter board. The first filter element is coupled between the first end of the connection line and the ground, and the second filter element is coupled between the second end of the connection line and the ground. The electronic device of claim 1, wherein the first filter component is a filter capacitor. The electronic device of claim 1, wherein the number of the first filter elements is the same as the number of connection lines, and the first end of each connection line is connected to a first filter element. The electronic device of claim 1, wherein the first filter element is an electromagnetic compatibility filter. The electronic device of claim 1, wherein the second filter component is a filter capacitor. The electronic device of claim 1, wherein the second filter element is an electromagnetic compatibility filter. The electronic device of claim 1, wherein the number of the second filter elements is the same as the number of the connection lines, and the second end of each connection line is connected to a second filter element.