Power Analyzer Based on Digital Bandwidth Limiting Technology

Abstract

The invention discloses a power analyzer based on digital bandwidth limitation technology. After the sensor acquisition signal is conditioned by a signal conditioning module, it is converted from analog to digital by an ADC module and input into a buffer module; the bandwidth limitation parameter storage module pre-stores frequency bandwidth limitations of several cut-off frequencies. Parameters, the central control module sets the digital line bandwidth limiting module and the digital frequency bandwidth limiting module according to the cut-off frequency reading parameters set by the user, and the digital line bandwidth limiting module reads the signal from the buffer module to limit the line bandwidth and sends it to the frequency measurement module And the parameter analysis module, the digital frequency bandwidth limiting module reads the signal from the buffer module to limit the frequency bandwidth and sends it to the frequency measurement module, the frequency measurement module performs frequency measurement according to the received signal and sends the result to the parameter analysis module, and the parameter analysis module performs parameter analysis Analyze the output. The invention has low cut-off bandwidth and better filtering effect, and realizes variable cut-off bandwidth within limited resources.

Description

technical field [0001] The invention belongs to the technical field of power analyzers, and more specifically relates to a power analyzer based on digital bandwidth limiting technology. Background technique [0002] The bandwidth limiting device is a device for the data acquisition system to limit the frequency bandwidth of the collected data. In the data acquisition system, after the input signal passes through the bandwidth limiting device, the signal outside the frequency band will be effectively filtered out, and the frequency of the input signal will be limited within a certain range. Bandwidth limitation is of great significance in digital acquisition systems. When the high-frequency interference in the signal collected by the data acquisition system is very large or the envelope signal formed by the superimposition of multiple frequency signals is collected, bandwidth limitation can be used to limit the input signal. The bandwidth is partially limited within a certai...

AI Technical Summary

Problems solved by technology

[0004] It can be seen that in the circuit design of the existing power analyzer, the bandwidth limiting module is implemented by an analog circuit, which is mainly composed of components such as resistors, capacitors, and inductors. It is sensitive to the external environment and has voltage drift, temperature drift, and noise. problem, and the stopband attenuation is difficult to reach -60dB

Moreover, once the analog bandwidth limit module is built, it is difficult to modify parameters, such as the cut-off frequency of the bandwidth limit, etc., and there are limitations in practical applications.

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