eTPU-based synchronous sampling and frequency measuring device for alternating-current signals and working method thereof

A technology for measuring AC signals and frequencies, applied to frequency measuring devices, etc., can solve the problems of low measurement accuracy and real-time performance, and achieve the effects of ensuring continuity and integrity, reducing load, and ensuring reliability

Active Publication Date: 2011-07-06
TIANJIN KEYVIA ELECTRIC CO LTD
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the above method, the accuracy of the frequency measurement and synchronous sampling of the AC signal is limited by the timer accuracy of the

Method used

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  • eTPU-based synchronous sampling and frequency measuring device for alternating-current signals and working method thereof
  • eTPU-based synchronous sampling and frequency measuring device for alternating-current signals and working method thereof
  • eTPU-based synchronous sampling and frequency measuring device for alternating-current signals and working method thereof

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Example Embodiment

[0030] Example: An eTPU-based AC signal synchronous sampling and frequency measurement device (see figure 1 ), which is characterized in that it includes a microcontroller unit, an AC sine wave / square wave conversion module, an AD conversion module, a low-pass filter unit and a voltage reference unit; wherein the input end of the microcontroller unit is connected to the AC sine wave / The input end of the square wave conversion module is connected to the input end of the AD conversion module, and its output end is connected to the output end of the AD conversion module; the input end of the so-called AC sine wave / square wave conversion module is connected to the output end of the low-pass filter unit Connection; the input terminal of the AD conversion module collects the voltage signal of the voltage reference unit; the input terminal of the low-pass filter unit collects the analog AC signal.

[0031] The above-mentioned AD conversion module is composed of two AD7656-1 chips workin...

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Abstract

The invention discloses an eTPU-based synchronous sampling and frequency measuring device for alternating-current signals, comprising a microcontroller unit, an alternating-current sine wave/square wave conversion module, an AD (Analog-to-Digital) conversion module, a low-pass filtering unit and a voltage reference unit. The working method of the device comprises the steps of: initializing the functions of an eTPU module; setting a channel 1 of the module as an input capturing mode of GPIO (General Purpose Input/Output) function; setting a channel 2 of the module as a PWM (Pulse Width Modulation) output mode and starting the sampling; acquiring the alternating-current voltage signals needing frequency measurement, carrying out waveform conversion on the signals and sending the converted square wave signals to the channel 1 of the eTPU module; finishing the sampling conversion by a chip in the AD conversion module; capturing the square wave signals by the channel 1 of the eTPU module and computing the frequency values of the signals; adjusting the PWM period value of the channel 2 of the eTPU module; taking an intermediate value as the current actual measurement frequency; and monitoring the frequency measurement function. The device is a system which is good in instantaneity, high in precision, small in resource consumption and convenient to be realized in embedded systems; and the working method of the device is simple and easy to operate.

Description

(1) Technical field: [0001] The invention belongs to the fields of electrified railway traction automation and power system substation automation, in particular an eTPU (enhanced time sequence processing unit—enhanced Time ProcessorUnit)-based automatic synchronous sampling and frequency measurement method for AC signals. (two) background technology: [0002] In the electrified railway traction automation system and the power system substation integrated automation system, in order to realize the normal control and monitoring of related power equipment, it is necessary to accurately measure various AC voltage and current signals, and when the frequency of the above signals changes, it can be Adjust the sampling frequency in real time to realize the automatic synchronous sampling of the above signals. [0003] For the automatic synchronous sampling and frequency measurement of AC signals, the general method is: first convert the AC signal into a square wave signal, use the ti...

Claims

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Application Information

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IPC IPC(8): G01R23/02
Inventor 曾庆钊李政张志刚赵宪文闫兆辉
Owner TIANJIN KEYVIA ELECTRIC CO LTD
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