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High precision high frequency sin wave virtual value real-time detection method

A real-time detection and sine wave technology, applied in the field of real-time detection of high-precision high-frequency sine wave effective value, can solve the problems of narrow frequency adaptation range, low resolution, poor flexibility, etc., and achieve wide application range, small error, and calculation speed fast effect

Inactive Publication Date: 2013-06-12
SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
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Problems solved by technology

The advantage of the analog method is that the structure is simple and easy to design, but its resolution is low, the frequency adaptation range is narrow, and the flexibility is poor; the digital method uses the sampling circuit to digitize the sine wave signal, and then realizes the effective value extraction through digital processing software

Method used

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  • High precision high frequency sin wave virtual value real-time detection method
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  • High precision high frequency sin wave virtual value real-time detection method

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Embodiment Construction

[0021] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0022] figure 1 It is a flowchart of the present invention. FPGA-based high-precision high-frequency sine wave effective value real-time algorithm. Adopt Spartan3XC2S400FPGA chip of Xilinx Company. As shown in Figure 2, the frequency of the sine wave is 330KHz, the AD sampling speed is 10Mhz, and the number of samples (m) collected in each cycle is about 30. Since the position of the sampling point in each cycle is not fixed after sampling, the sampling point is directly used Points to calculate the effective value will produce errors.

[0023] First calculate using divider, square root and multiplier Then use the method described in formula (3) to calculate the effective value of a sine cycle from the nth sampling point, record any point as the nth point, and start from the nth point, use the multiplier to sample data of each sampling point Car...

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Abstract

The invention relates to a high frequency sin wave virtual value digital real-time detection technology, in particular to a high precision high frequency sin wave virtual value real-time detection method based on the field programmable gata array (FPGA) high-speed data processing technology. The method includes the steps of taking any one sampling point as a nth point from sampling points m in a cycle of sine wave, calculating sin wave virtual values from n to n+m-1, wherein the sampling amplitude is xi in a cycle, and calculating Sn+1, Sn+2, ..., Sn+m-1; taking a mean S of m virtual value data Si (i=1, 2... m) as a virtual value of the sine wave. The calculation error is little, the computing speed is fast, the scope of application is wide, and the virtual value detection of the sine wave which ranges from tens of KHz frequency to hundreds of KHz can be achieved by changing parameters.

Description

technical field [0001] The invention relates to digital real-time detection technology of high-frequency sine wave effective value, in particular to a high-precision high-frequency high-frequency sine wave effective value real-time detection method based on FPGA high-speed data processing technology. Background technique [0002] The sine wave effective value detection method (RMS) can be divided into two categories: analog and digital. The analog method uses an analog circuit to detect the effective value of the sine wave signal. The advantages of the analog method are simple structure and easy design, but its resolution is low, the frequency adaptation range is narrow, and the flexibility is poor; the digital method uses the sampling circuit to digitize the sine wave signal, and then realizes the effective value extraction through digital processing software. The digital processing method has a high resolution, and can adapt to different sine wave signal frequencies by mod...

Claims

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Application Information

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IPC IPC(8): G01R19/02G01R19/25
Inventor 王越超王栋董再励鲁鹏周磊焦念东
Owner SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
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