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A power filter device

A power filter and power line technology, which is applied in the field of information security, can solve the problems of power line signal attenuation, leakage, and inability to attenuate screen information, etc., and achieve the effect of improving safety and good filtering performance

Active Publication Date: 2019-10-29
李瑞峰 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, one of the main problems in designing and selecting power line filters is to construct an economical and reasonable circuit structure, and make it able to provide high insertion loss in the frequency range of conducted interference (CISPR17 standard is 150kHz ~ 30MHz), so that the power line The signal is attenuated the most, that is, the insertion loss of the existing filter is designed for the range of 150kHz to 30MHz, and the radiation leakage of the computer screen information is mainly distributed in the range of 30MHz to 400MHz. For this frequency range, the existing filter The filter cannot attenuate the screen information conducted by the computer along the power line, resulting in leakage

Method used

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Embodiment Construction

[0026] The purpose of the present invention is to provide a power filter device, which can effectively suppress the conduction of computer screen information along the power line.

[0027] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0028] Such as figure 1As shown, a power filter device, the power filter device is connected in series in the power line, the device includes: PCB board, input high-frequency filter circuit 1, a first-stage differential-mode filter circuit 2, a first-stage common-mode filter Circuit 3, secondary common-mode filter circuit 4, secondary differential-mode filter circuit 5, and output high-frequency filter circuit 6, the input high-frequency filter circuit 1, the primary differential-mode filter circuit 2, the primary common-mode filter circuit The mode f...

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Abstract

The invention discloses a power filter device which specifically includes a PCB, an input end high-frequency filter circuit, a primary differential mode filter circuit, a primary common mode filter circuit, a secondary common mode filter circuit, a secondary differential mode filter circuit, and an output end high-frequency filter circuit. The input end high-frequency filter circuit, the primary differential mode filter circuit, the primary common mode filter circuit, the secondary common mode filter circuit, the secondary differential mode filter circuit and the output end high-frequency filter circuit are welded onto the PCB. The power filter device is connected in series in a power line. Transmission of computer screen information along the power line is restrained, and the safety of information is improved.

Description

technical field [0001] The invention relates to the technical field of information security, in particular to a power filter device. Background technique [0002] Computers and their network systems are key and important components of various electronic devices. Information attack and information interception of computer system are important ways of computer system leakage. TEMPEST (Transient Electromagnetic Pulse Emanation Surveillance Technology) technology is an extremely important project jointly researched and developed by the US National Security Agency and the Department of Defense. Its research contents mainly include: electromagnetic leakage mechanism of information processing equipment, protection technology of information radiation leakage, extraction technology of useful information, testing technology and standards. [0003] The main purpose of TEMPEST technology is to reduce the leakage of information in the computer. One way to suppress information leakage ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/12H03H7/01
CPCH02M1/126H03H7/0115
Inventor 李瑞峰
Owner 李瑞峰
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