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Pulse anti-interference method and device

An anti-interference device and pulse technology, applied in the field of signal anti-interference, can solve problems such as wrong operation and poor electrostatic filtering effect, and achieve the effect of eliminating interference, improving the anti-interference ability of equipment, and reducing the use of hardware.

Inactive Publication Date: 2015-01-28
MAIPU COMM TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At this time, it may lead to erroneous operation
Therefore, the capacitance loaded on the reset signal cannot be too large during design, but the loaded capacitance is small, and the filtering effect on static electricity is not good.

Method used

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  • Pulse anti-interference method and device

Examples

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Embodiment

[0030] Since the reset pulse and the interference pulse have different levels, usually the reset pulse is a low-level (-0.3~0.8V) square wave signal with a duration T=200ms, and the static pulse is a spike signal with a duration D of 3~7μs. The level is usually much higher than the system high level (2.0-3.6V). The technical solution of the present invention will be described in detail below by taking reset pulse anti-static interference as an example. It should be noted that this specific embodiment does not affect the generality of the present invention.

[0031] In this example, the parameters are selected as: n=250, t=40ns, that is, the system clock frequency of 25MHz is used as the sampling frequency, and 250 consecutive samplings are performed. Here t×n=10μs, which is 3-7μs longer than the duration of the static interference pulse and smaller than the duration of the reset pulse T=200ms. The specific process of this example is as follows figure 1 Shown:

[0032] Step...

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PUM

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Abstract

The invention belongs to the signal anti-interference technical filed and discloses a pulse anti-interference method and device. The pulse anti-interference method of the invention includes the step that n times of sampling detection is performed on pulse signal electrical levels with a set period, if n-times sampling values are continuous normal pulse signal electrical levels, it can be judged that normal pulses are detected, if other electric levels appear in the n-times sampling values, it can be judged that interference pulses exist, wherein the n is a positive integer and is large enough to ensure the reliability of the detection. The invention also discloses a pulse anti-interference device. According to the pulse anti-interference method and device of the invention, the pulse electrical levels are sampled, so that interference can be eliminated, and the anti-interference ability of equipment can be greatly improved, and as a result, the equipment can withstand 12kV electrostatic pulse interference. The pulse anti-interference method of the invention is flexible to operate, and sampling parameters (sampling frequency) can be adjusted according to an actual environment in which the equipment operates. With the pulse anti-interference method and device adopted, interference can be eliminated, and the use of hardware can be decreased, and the space of a circuit board can be saved, and product cost can be reduced.

Description

technical field [0001] The invention relates to signal anti-interference technology, in particular to a method for resisting static pulse interference in electronic products. Background technique [0002] The pulse signal is a discrete signal with various waveforms. Compared with ordinary analog signals (such as sine waves), the waveforms are discontinuous on the time axis (there is a clear interval between waveforms), but usually have a certain periodicity. The most common pulse signal is a rectangular wave (that is, a square wave), such as a clock pulse, a reset pulse, and the like. Impulse signals can be used to represent information, and can also be used as a carrier. The pulse representing information can represent an instruction, which is used to command the device to perform a certain action, such as a reset pulse, which is to command the device or chip to perform a reset action. In the circuit, the reset pulse is an important pulse signal, especially when the runn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K3/013
CPCH03K3/013
Inventor 刘磊
Owner MAIPU COMM TECH CO LTD
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