Printed circuit board and common-mode filter thereof

A technology for printed circuit boards and common mode filters, which is applied to printed circuit components, circuits, inductors, etc., can solve the problems of increasing the cost of computer motherboards and occupying the wiring space of computer motherboards, so as to save wiring space and save cost effect

Inactive Publication Date: 2011-11-09
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the USB interface is already a standard configuration interface of computer equipment. The USB interface is connected to the USB controller on the computer motherboard through a differential signal line. For uplink transmission, a common-mode filter is usually set on the differential signal line between the USB interface and the USB controller. Although the common-mode filter can filter the common-mode signal on the differential signal line, the common-mode filter Filters take up routing space and increase the cost of computer motherboards

Method used

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  • Printed circuit board and common-mode filter thereof
  • Printed circuit board and common-mode filter thereof
  • Printed circuit board and common-mode filter thereof

Examples

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Embodiment Construction

[0019] Please refer to figure 1 and figure 2 A preferred embodiment of the printed circuit board 100 of the present invention includes a signal layer 110 and a ground layer 120 adjacent to the signal layer 110, a pair of differential transmission lines 112 and 114 are arranged on the signal layer 110, and the differential transmission line 112 and 114 are used to transmit differential signals, such as transmitting signals between the USB interface and the USB controller. The printed circuit board 100 may also include other layers, such as a power supply layer, etc. Since the present invention does not involve the structure of other layers, other layers will not be described in detail.

[0020] In order to suppress the transmission of common mode signals on the differential transmission lines 112 and 114, the present invention makes a structural improvement on the ground layer 120, that is, the ground layer 120 is hollowed out at a specific position, so that the hollowed out ...

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Abstract

The invention relates to a printed circuit board, which comprises a signal layer and a grounding layer close to the signal layer; a pair of difference transmission lines is arranged on the signal layer; a common-mode filter is arranged on the grounding layer and comprises two filtering parts positioned on the two sides of the difference transmission lines projected on the grounding layer; each filtering part is formed by connecting a plurality of mutually-parallel strip copper foils in an end-to-end manner at intervals; and a hollow area on the two filtering parts is communicated with a strip hollow area. The common-mode filter is applied to the printed circuit board, and a common-mode signal running through the difference transmission lines can be effectively filtered out.

Description

technical field [0001] The invention relates to a printed circuit board and a common mode filter thereof. Background technique [0002] At present, the USB interface is already a standard configuration interface of computer equipment. The USB interface is connected to the USB controller on the computer motherboard through a differential signal line. For uplink transmission, a common-mode filter is usually set on the differential signal line between the USB interface and the USB controller. Although the common-mode filter can filter the common-mode signal on the differential signal line, the common-mode filter The filter occupies the wiring space of the computer motherboard and increases the cost of the computer motherboard. Contents of the invention [0003] In view of the above, it is necessary to provide a printed circuit board and a common mode filter thereof that can realize a common mode filter by modifying the structure of the printed circuit board itself. [0004]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K1/02H05K1/16H01F37/00
Inventor 白育彰刘建宏谢博全
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD
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