Shift-register-based anti-interference method

A shift register, amplifier technology, applied in static memory, digital memory information, instruments, etc., can solve problems such as pulse judgment errors

Active Publication Date: 2012-07-11
浙江德菲洛智能机械制造有限公司
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  • Abstract
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Problems solved by technology

The disadvantage is that not all interference pulses are positive pulses. When the interference pulse is a negative pulse and superimposed on the high level of the normal pulse, the normal pulse will be divided into multiple pulses, and the width of the high level may be greater than that of RC charge and discharge. The time constant of the circuit, or less than the time constant of the RC charge and discharge circuit, resulting in wrong pulse judgment

Method used

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Embodiment Construction

[0026] Such as figure 1 As shown, the present invention is composed of a shaping circuit 1, a shift register 2, a clock pulse generator 5, a threshold setting circuit 4, an amplifier 5 and a comparator 6.

[0027] Such as figure 1 As shown, the clock pulse generator 5 is connected to the clock input terminal Clock of the shift register 2, the shaping circuit 1 is connected to the data input terminal Data of the shift register 2, and the data output terminals Q1, Q2, . ..Qn is connected to multiple input terminals of the amplifier 5 , the input terminal of the amplifier 5 is connected to the non-inverting terminal of the comparator 6 , and the threshold value setting circuit 4 is connected to the inverting terminal of the comparator 6 .

[0028] The threshold voltage of the threshold setting circuit 4 is calculated as follows:

[0029] The output high level voltage of shift register 2 is U H , the low level voltage is U L , the number of data output terminals of the shift r...

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Abstract

The invention discloses a shift-register-based anti-interference method. A clock-pulse generator is connected to a clock input end Clock of a shift register; a shaping circuit is connected to a data input end Data of the shift register; data output ends of the shift register are connected to a plurality of input ends of an amplifier; the input ends of the amplifier are connected to an in-phase end of a comparator; and a threshold value setting circuit is connected to an anti-phase end of the comparator (6). The pulse width is converted into a voltage value through pulse subdivision, shift register recording and adder superposition, and the voltage value is compared with a set voltage value so as to judge whether a pulse signal is an interference signal. According to the shift-register-based anti-interference method, the pulse width is converted into the voltage value through the pulse subdivision, the shift register recording and the adder superposition, so that pulse judgment errors caused by segmentation of a normal pulse by a negative-going pulse in a resistor-capacitor (RC) charge-discharge circuit are overcome.

Description

technical field [0001] The invention relates to an anti-jamming method on an industrial site, in particular to an anti-jamming method based on a shift register. Background technique [0002] During the production process of factories and enterprises, some large electrical equipment (such as motors, etc.) often start and stop frequently, causing some capacitive and perceptual interference on the industrial site, affecting the normal operation of the working equipment. [0003] Secondly, lightning in nature is also a major source of natural interference, and the interference generated by lightning can be transmitted thousands of kilometers away. Its time-domain waveform is a large spike superimposed on a background of random pulses. [0004] There are generally two ways of electromagnetic interference propagation: conduction coupling and radiation coupling. [0005] Conductive coupling mode: When there is a complete circuit connection between the interference source and the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11C19/28
Inventor 饶秀勤应义斌
Owner 浙江德菲洛智能机械制造有限公司
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