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Device and method for qualitatively detecting PCB (printed circuit board) board electromagnetic interference radiation performance

A PCB board and electromagnetic interference technology, which is applied in the field of devices for qualitatively detecting the electromagnetic interference radiation performance of PCB boards, can solve the problems of low accuracy of detection results and high price, and achieve the effects of shortening the design cycle, low cost, and improving the pass rate

Inactive Publication Date: 2011-08-24
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a device and method for qualitatively detecting the electromagnetic interference radiation performance of PCB boards in order to solve the problems of low accuracy and high price of the existing detection results of electromagnetic interference radiation of PCB boards

Method used

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  • Device and method for qualitatively detecting PCB (printed circuit board) board electromagnetic interference radiation performance
  • Device and method for qualitatively detecting PCB (printed circuit board) board electromagnetic interference radiation performance
  • Device and method for qualitatively detecting PCB (printed circuit board) board electromagnetic interference radiation performance

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specific Embodiment approach 1

[0043] Specific implementation mode one: the following combination figure 1Describe this embodiment, the device of the qualitative detection PCB board electromagnetic interference radiation performance described in this embodiment, it comprises near-field probe 1, preamplifier 2, spectrum analyzer 3, PC machine 4, single-chip microcomputer circuit 5, X-axis motor Isolation and drive unit 6-1, X-axis motor H-bridge drive circuit 6-2, X-axis direction stepping motor 6-3, Y-axis motor isolation and drive unit 7-1, Y-axis motor H-bridge drive circuit 7-2 and Y-axis direction stepper motor 7-3, PC 4 is embedded with data processing and image display unit 8,

[0044] The mode control signal output end of the PC 4 is connected to the mode control signal input end of the single-chip microcomputer circuit 5, and the X-axis motor control signal output end of the single-chip microcomputer circuit 5 is connected to the control signal input end of the X-axis motor isolation and drive unit ...

specific Embodiment approach 2

[0051] Specific implementation mode two: the following combination figure 2 Describe this embodiment. The difference between this embodiment and Embodiment 1 is that it also includes a Y-axis motor current detection unit 7-4 and an X-axis motor current detection unit 6-4.

[0052] The Y-axis motor current detection unit 7-4 is used to collect the operating current of the Y-axis direction stepping motor 7-3, and the current signal output end of the Y-axis motor current detection unit 7-4 is connected to the Y-axis motor current signal of the single-chip microcomputer circuit 5 input terminal;

[0053] The X-axis motor current detection unit 6-4 is used to collect the operating current of the stepping motor 6-3 in the X-axis direction, and the current signal output terminal of the X-axis motor current detection unit 6-4 is connected to the X-axis motor current signal of the single-chip microcomputer circuit 5 input. Other components and connections are the same as those in Em...

specific Embodiment approach 3

[0055] Specific implementation mode three: the following combination figure 1 Describe this embodiment, this embodiment is based on the detection method of the device of the qualitative detection PCB board electromagnetic interference radiation performance described in embodiment one, sends the control command of LabVIEW software by PC 4, and single-chip microcomputer circuit 5 according to the control command that receives Determine the scanning mode of the near-field probe 1, and the single-chip microcomputer circuit 5 obtains the movement direction and the movement distance of the stepping motor 6-3 in the X-axis direction and the stepping motor 7-3 in the Y-axis direction according to the received control command, and according to the The movement distance is calculated to obtain the number of driving pulses of the driving signal of the corresponding motor, and then the direction of movement and the number of driving pulses are used to form a control signal for driving the ...

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Abstract

The invention discloses a device and method for qualitatively detecting PCB (printed circuit board) board electromagnetic interference radiation performance, belonging to the technical field of electromagnetic detection. The device and the method solve the problems of low detection result accuracy and high price of the PCB electromagnetic interference. A control order is sent by a PC (personal computer) machine, a singlechip circuit determines the scanning operation mode of a near field probe according to the control order; the singlechip circuit simultaneously controls the movement direction and the movement distance of an X-axis direction stepping motor and a Y-axis direction stepping motor; the control signal of the singlechip circuit drives a corresponding motor to move so as to drive the near field probe to position; after the near field probe is positioned, the acquisition signal of the near field probe is received by a spectrum analyzer, and the acquired signal is transmitted to the PC machine; and finally, the processed data and images are displayed by a data processing and image displaying unit. The device and the method are used for detecting the PCB electromagnetic interference radiation.

Description

technical field [0001] The invention relates to a device and method for qualitatively detecting the electromagnetic interference radiation performance of a PCB board, belonging to the technical field of electromagnetic detection. Background technique [0002] In recent years, with the rapid development of electronic information science, the operating frequency of high-speed PCB boards has increased at a geometric rate, and the integration and power levels of the devices are getting higher and higher, which will affect the electromagnetic compatibility of the PCB board and even the entire system. (Electromagnetic Compatible, EMC) has brought many problems. In this context, governments of various countries have formulated a large number of standards to limit the electromagnetic radiation intensity of high-speed PCB boards. For example, the CE standard of the European Union and the FCC standard of the United States stipulate that the product must pass a series of extremely str...

Claims

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Application Information

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IPC IPC(8): G01R29/08G01R23/16
Inventor 王立欣吕超景海涛孙婷李龙涛邓晨华
Owner HARBIN INST OF TECH
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