Method for designing anti-nuclear electromagnetic pulse power supply line filter

A power line filter and anti-nuclear electromagnetic pulse technology, which is applied to emergency protection circuit devices, instruments, and calculations for limiting overcurrent/overvoltage, and can solve problems such as inability to complete HEMP suppression, interference, and large amplitude

Inactive Publication Date: 2016-01-13
XIDIAN UNIV
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Problems solved by technology

[0005] HEMP can cause serious interference to electronic equipment systems through power lines. Traditional power filters can suppress low-frequency and small-amplitude electromagnetic interference generated on power lines. However, due to the short rise time and large amplitude of nuclear electromagnetic pulses, traditional power filters Response not fast enough to complete suppression of HEMP

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  • Method for designing anti-nuclear electromagnetic pulse power supply line filter
  • Method for designing anti-nuclear electromagnetic pulse power supply line filter
  • Method for designing anti-nuclear electromagnetic pulse power supply line filter

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Embodiment Construction

[0048] A design method of a power line filter for anti-nuclear electromagnetic pulse will take the design of a 24VDC / 2A anti-nuclear electromagnetic pulse power line filter as an example to give a specific design process.

[0049] (1) Analyze the characteristics of nuclear electromagnetic pulse interference.

[0050] The characteristics of the nuclear electromagnetic pulse are simulated using the double exponential function as a model, and the expression of its field strength is as follows:

[0051] E(t)=E 0 ·k·(e -αt -e -βt )(1)

[0052] In the formula, E 0 =5×10 4 V / m, k=1.3, α=4×10 7 / s, β=6×10 8 / s;

[0053] From the time-domain waveform of the nuclear electromagnetic pulse ( figure 1 ) shows that HEMP has an extremely fast rise time of 2.3ns and an amplitude of 50kV / m; from the frequency domain waveform ( figure 2 ) shows that its spectrum ranges from 100Hz to 200MHz, which can cover a wide frequency band and cause interference to various electronic devices.

[...

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Abstract

The present invention relates to a method for designing an anti-nuclear electromagnetic pulse power supply line filter. The method comprises: determining a mathematical model of nuclear electromagnetic pulse interference, and calculating a maximum coupling magnitude of an interference source on a power supply line according to the mathematical model; according to the maximum coupling magnitude, determining a protection index; then selecting a filter circuit, and determining a required filter element of the filter circuit; and by repeatedly debugging filter insertion loss, determining the required filter element of the filter circuit, until meeting a requirement. In the selection of the filter circuit, the design for the power supply line filter is divided into two parts: a transient suppression part and a steady-state suppression part. The transient suppression part mainly suppresses a nuclear electromagnetic pulse with large pulse amplitude and short rise time, and is completed by a transient suppression device. The steady-state part mainly suppresses ordinary electromagnetic interference with small amplitude and long rise time, entering into a power grid, and can be implemented by a conventional power supply filter device.

Description

technical field [0001] The invention belongs to the technical field of filter design, and particularly proposes a design method of a power line filter for anti-nuclear electromagnetic pulse. Background technique [0002] With the development of the electronics industry, various electronic devices are increasingly used in production and life. The increasing number and density of electronic equipment has made the mutual interference problem very prominent. At the same time, the electromagnetic environment in which electronic equipment is located is getting worse and worse. Strong electromagnetic pulses such as ultra-wideband, high-power microwaves, and even nuclear explosions All will interfere with the normal operation of electronic equipment, and even cause damage to electronic equipment. The invention considers the filter design problem under the condition of resisting extremely strong electromagnetic pulse interference, that is, a small nuclear explosion. [0003] The st...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCH02H5/005H02H9/005
Inventor 邱扬张建国田锦
Owner XIDIAN UNIV
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