Method and device for zero-crossing filtering of rectangular wave signal
A filter device, rectangular wave technology, applied in the electronic field, can solve the problem of not being able to identify the width of interference, etc., and achieve a good filtering effect
Active Publication Date: 2018-04-03
重庆科知源科技有限公司
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Problems solved by technology
[0006] With the traditional low-pass filter circuit, in addition to the delay, the width of the interference cannot be identified
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[0043] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
[0044] A kind of rectangular wave signal zero-crossing filtering method provided by the present invention, such as Figure 4 As shown, it specifically includes the following steps:
[0045] Step 1) The input signal is filtered by the filter module; with a continuous effective width T f Filtering the input signal as a filter condition, the output has T f Delayed filtered signal.
[0046] Step 2) the zero-crossing width T of the zero-crossing width statistical module statistics signal z ;Zero crossing width T z is the time from the start of zero-crossing interference to the end of filtering.
[0047] Step 3) The period T of the signal after the period statistics module statistics filtering;
[0048] Step 4) Compensate the filter delay of the signal through the time correction module according to the period of the signal, the interference ...
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The invention relates to a zero crossing filtering method and a zero crossing filtering device for a square-wave signal, and belongs to the technical field of electronics. The method comprises the following concrete steps of performing filtering processing on an input signal through a filtering module, and outputting a filtered signal with Tf delay; performing statistics on the zero crossing width Tz of the signal through a zero crossing width statistic module; performing statistics on the period T of the filtered signal through a period statistic module; performing compensation on filtering delay of the signal through a time correction module according to the period, the zero crossing point interference width and the zero crossing point moment of the signal, and outputting a corrected signal. According to the zero crossing filtering method and the zero crossing filtering device for the square-wave signal, provided by the invention, the correct occurrence time of a zero crossing signal is determined according to the moment and the width of interference, and the compensation is performed on the filtering delay of the signal so as to output the correct moment of the next hop of the signal; the zero crossing filtering method and the zero crossing filtering device for the square-wave signal have a better filtering effect.
Description
technical field [0001] The invention belongs to the technical field of electronics, and relates to a method and device for zero-crossing filtering of a rectangular wave signal. Background technique [0002] In some control circuits, such as PWM modulation, thyristor point trigger, etc., it is necessary to determine the control reference time according to the zero-crossing point of the signal. Such signals are often processed into rectangular wave signals to facilitate subsequent digital circuit processing and conversion. [0003] However, when the reference signal is processed into a rectangular wave signal, if there is interference in the original signal, the processed square wave signal will also have interference, especially the interference at the zero crossing point is more serious. A typical disturbed rectangular wave signal such as figure 1 shown. [0004] In order to eliminate interference signals, filter circuits are often required. For this high-frequency inter...
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IPC IPC(8): H03K5/135
Inventor 程森林赵晓兀王燕何强志
Owner 重庆科知源科技有限公司