Pulse counting frequency measurement method and device

A technology of pulse counting and measuring device, which is applied to frequency measuring device and conversion of frequency to pulse sequence, etc., can solve the problems of low calculation accuracy and poor real-time performance, and achieve the effect of simple measuring device, guaranteed frequency range and wide application value.

Pending Publication Date: 2020-09-29
NR ELECTRIC CO LTD +1
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Problems solved by technology

[0002] Pulse counting and frequency measurement are widely used in the field of industrial process control automation technology such as motor speed and encoder displacement detection. In the prior art, pulse counting and frequency measurement have the disadvantages of poor real-time performance and low calculation accuracy.

Method used

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  • Pulse counting frequency measurement method and device

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0022] Use the encoder to generate the counting pulse, and send the pulse signal to the high-speed optocoupler isolator, refer to figure 1 , the pulse passes through the high-speed optocoupler isolator for signal isolation, and the pulse signal after signal isolation passes through the voltage follower, hysteresis comparator and MOS in turn to follow, compare and shape the pulse signal, and convert it into high and low levels to enter the FPGA, and complete the above steps Isolation and shaping of pulsed signals.

[0023] The pulse signal after pulse isolation and shaping is transmitted to FPGA for pulse processing:

[0024] The FPGA captures the isolated and shaped pulse signal, filters illeg...

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Abstract

The invention discloses a pulse counting frequency measurement method and device. The method comprises the steps: carrying out filtering of an illegal pulse on a filtered and shaped pulse through an FPGA, obtaining a normal pulse, carrying out pulse accumulation on the normal pulse, marking a time mark on an accumulated pulse quantity signal, transmitting the accumulated pulse quantity signal to an MCU, and carrying out pulse frequency measurement through a moving time window method; and adopting a hardware combination scheme of the FPGA and the MCU, calculating a pulse frequency according toa moving time window method, and effectively guaranteeing precision of pulse counting and frequency measurement. The measurement device is simple and has a wide application value.

Description

technical field [0001] The invention relates to a pulse counting frequency measurement method and device, belonging to the technical field of industrial process control automation. Background technique [0002] Pulse counting and frequency measurement are widely used in motor speed and encoder displacement detection in the field of industrial process control automation technology. In the prior art, pulse counting and frequency measurement have the disadvantages of poor real-time performance and low calculation accuracy. Contents of the invention [0003] The purpose of the present invention is to provide a pulse counting frequency measurement method and device to solve the above-mentioned defects or one of the defects in the prior art. [0004] In order to achieve the above object, the present invention is achieved by adopting the following technical solutions: [0005] In a first aspect, the present invention provides a pulse counting frequency measurement method, and th...

Claims

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Application Information

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IPC IPC(8): G01R23/10
CPCG01R23/10Y02E30/30
Inventor 李忠柱徐卫峰臧峰牛洪海
Owner NR ELECTRIC CO LTD
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