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Equal-precision frequency measuring circuit and frequency measuring method thereof

A frequency measurement circuit, equal precision technology, applied in the direction of frequency measurement devices, etc., can solve problems such as fluctuations in measurement accuracy, and achieve the effects of eliminating errors, improving accuracy and real-time performance

Active Publication Date: 2011-07-20
SHANGHAI AUTOMATION INSTRAION CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The error of the number of pulse signals detected per unit time is 1, and the measurement accuracy of this method will fluctuate greatly due to the change of frequency

Method used

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  • Equal-precision frequency measuring circuit and frequency measuring method thereof
  • Equal-precision frequency measuring circuit and frequency measuring method thereof
  • Equal-precision frequency measuring circuit and frequency measuring method thereof

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0023] figure 1 It is a schematic diagram of the equal-precision frequency measurement circuit of the present invention.

[0024] See figure 1 , the equal-precision frequency measuring circuit of the present invention comprises a first counter 4, a second counter 5 and a frequency division counter 3, wherein the measured signal is connected to the clock input terminals of the first D flip-flop 1 and the second D flip-flop 2 respectively connected, the output of the first D flip-flop 1 is connected to the input of the first counter 4, and the output of the second D flip-flop 2 is connected to the input of the second counter 5;

[0025] The trigger terminal of the first D flip-flop 1 is connected to the control signal START, the output terminal is connected to the enable terminal of the first counter 4, the trigger terminal of the second D flip-flop 2 i...

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Abstract

The invention discloses an equal-precision frequency measuring circuit and a frequency measuring method thereof, wherein the circuit comprises a first counter, a second counter and a frequency division counter; a tested signal is respectively connected with clock input ends of a first D trigger and a second D trigger; a trigger end of the first D trigger is connected with a control signal START, and an output end of the first D trigger is connected with an enabling end of the first counter; the trigger end of the second D trigger is connected with the control signal STOP, and the output end of the second D trigger is connected with the enabling end of the second counter to realize synchronous control in the raising edges of the control signal and the tested signal; an output signal of the frequency division counter is connected with the clock input end of the first counter, and the tested signal is connected with the clock input end of the second counter. The equal-precision frequency measuring circuit and the frequency measuring method provided by the invention can eliminate the error in the number of the pulse signals caused by a counting method in unit time and remarkably improve the accuracy and real-time performance for collecting rotation speed signals.

Description

technical field [0001] The invention relates to a frequency measuring circuit and a frequency measuring method thereof, in particular to an equal precision frequency measuring circuit and a frequency measuring method thereof. Background technique [0002] On-site control systems, data acquisition and communication systems, equipment monitoring systems and human-machine interface units have been widely used in various industries. [0003] In the steam turbine speed control system, the accuracy and real-time performance of the steam turbine speed acquisition are very high. The commonly used acquisition method is to use the single-chip microcomputer to count in unit time, and count the frequency signal to be measured in unit time. The error of the number of pulse signals detected per unit time is 1, and the measurement accuracy of this method will fluctuate greatly due to the change of frequency. [0004] In order to avoid the error of the number of pulse signals in the count...

Claims

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Application Information

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IPC IPC(8): G01R23/02
Inventor 朱强韩媛高雪丽山陈琦
Owner SHANGHAI AUTOMATION INSTRAION CO LTD
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