A voltage transient signal detection circuit and method based on FPGA

A voltage transient and signal detection technology, applied in the direction of measuring electrical variables, measuring current/voltage, measuring devices, etc., can solve problems such as slow detection speed, voltage transient leakage detection, and increased CPU system burden, achieving fast speed, The effect of high portability

Active Publication Date: 2020-12-08
中电科思仪科技(安徽)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the power quality analyzer, the workload of the software is relatively large, and it is necessary to complete the work of abnormal voltage, voltage flicker, three-phase unbalance, harmonic analysis, etc. If the voltage transient signal detection is also implemented in the software, it will be greatly improved. Increase the burden on the CPU system, there are phenomena such as slow detection speed and prone to voltage transient leakage detection

Method used

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  • A voltage transient signal detection circuit and method based on FPGA
  • A voltage transient signal detection circuit and method based on FPGA
  • A voltage transient signal detection circuit and method based on FPGA

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Embodiment 1

[0065] Such as figure 1 As shown, a voltage transient signal detection circuit based on FPGA has 3 voltage input signals. After the 3 voltage input signals pass through the signal processing circuit, they are sent to the frequency measurement circuit. The frequency measurement circuit is composed of a channel switching circuit and a high-speed Composed of comparators, the channel switching circuit sends the 3-way input signal to the high-speed comparator in turn according to the switching clock set by the FPGA. After being converted into a digital signal by the high-speed comparator, it is sent to the FPGA to complete the 3-way input. Signal frequency measurement function.

[0066] It has 3 voltage input signals, each input signal includes 2 channels, the first channel is composed of signal processing circuit and ordinary A / D converter, used for voltage slow transient signal acquisition, and the second channel is composed of signal processing circuit The circuit and high-spee...

Embodiment 2

[0069] On the basis of the above-mentioned embodiment 1, the present invention also provides a method for realizing voltage transient signal detection based on FPGA, the process of which is as follows figure 2 As shown, the specific steps are as follows:

[0070] Step 1: Perform initialization work, including normal A / D converter initialization, high-speed A / D converter initialization, acquisition status bit clearing and transient register reset;

[0071] Step 2: Wait for the test enable signal sent by the CPU system to the FPGA. If the test enable signal is valid, start the test and continue to execute, otherwise wait until the test enable signal is valid;

[0072] Step 3: Execute the frequency measurement function; the channel switching circuit sends the 3-way voltage input signal to the high-speed comparator in turn according to the switching clock set by the FPGA, and after converting it into a digital clock signal, complete the 3-way voltage input in the FPGA Signal fre...

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Abstract

The invention discloses a circuit and a method for achieving voltage transient signal detection based on an FPGA, and belongs to the field of electric energy quality analysis. The circuit comprises three voltage input signal channels, a frequency measuring circuit, an FPGA and a CPU system. According to the circuit, three ways of voltage input signals are output to the FPGA after passing through the frequency measuring circuit, so that input signal frequency measurement is realized, and then the sampling frequency of an A / D converter is determined; and a voltage transient signal is detected while the A / D converter performs continuous data acquisition and storage. According to the circuit and the method, a frequency measuring function is achieved, the A / D converter sampling frequency can bedynamically changed so that the detection width of the voltage transient signal can be ensured; data acquisition and storage are performed continuously so that it can be ensured that the phenomena ofcollected data loss or voltage transient signal leak detection can not occur; a voltage slow transient signal and a voltage fast transient signal can be detected at the same time; and the voltage transient signal detection algorithm is all implemented in an FPGA, the speed is high, and the transportability is high.

Description

technical field [0001] The invention belongs to the field of power quality analysis, and in particular relates to a voltage transient signal detection circuit and method based on FPGA. Background technique [0002] In recent years, due to the continuous increase of voltage transients, impacts, asymmetry and nonlinear loads, the pollution to the power grid has become more and more serious. Various precision instruments and equipment have strict requirements on the quality of the power grid. Due to the power quality Problems, and the damage to the equipment caused by it also occurs frequently. Therefore, the current power quality issues are more and more people's attention. [0003] Voltage transient, also known as instantaneous pulse or surge, refers to a rapid change in voltage value between two continuous steady states, and its duration is very short, lasting for several milliseconds or less, and the voltage transient amplitude can be up to thousands of volts. Voltage tr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/25
CPCG01R19/2503G01R19/2506
Inventor 彭海军孙松源毛翌春朱文星钱彬朱炬李斌
Owner 中电科思仪科技(安徽)有限公司
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