Alternating current signal synchronous sampling method and device and alternating current sampling equipment
A technology for synchronous sampling of AC signals, applied in the field of synchronous sampling of AC signals, AC sampling equipment, and devices, can solve the problems of sampling schemes that are difficult to meet requirements, long response time, and error-prone frequency sampling, and achieve fast and synchronous sampling , improve accuracy and improve reliability
Pending Publication Date: 2022-05-10
ZHEJIANG TENGEN ELECTRIC
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Problems solved by technology
For example, when the signal is distorted near the zero point, the frequency sampling is prone to errors; and the response time is relatively long, such as the solution of the metering chip, the response time is determined by the update rate of the metering chip, for example, some metering chips need about 0.3s Wait
Therefore, in the case where fast sampling is required, the existing sampling scheme is difficult to meet the demand
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[0049] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all of them.
[0050] The components of the embodiments of the application generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations. Accordingly, the following detailed description of the embodiments of the application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of the present application.
[0051]He...
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The embodiment of the invention provides an alternating-current signal synchronous sampling method and device and alternating-current sampling equipment, and the method comprises the steps: carrying out the equal-interval sampling of an alternating-current signal according to a sampling interval of a corresponding period, and obtaining a sampling sequence of the corresponding period; during the sampling period of the current period, performing fast Fourier transform calculation on the sampling sequence of the previous period to obtain an amplitude spectrum of an alternating current signal of the previous period, and calculating an effective value of each parameter of the alternating current signal according to the amplitude spectrum of the previous period; when it is detected that sampling of the previous period meets a preset sampling adjustment condition, the sampling interval of the previous period is adjusted, and the adjusted sampling interval serves as the sampling interval of the next period; and returning to the step of carrying out equal-interval sampling on the alternating current signal according to the sampling interval of the corresponding period, and stopping sampling until a sampling cut-off condition is met. According to the invention, synchronous sampling of alternating current signals can be realized, and the sampling accuracy and the like are ensured.
Description
technical field [0001] The present application relates to the technical field of power electronics, in particular to an AC signal synchronous sampling method, device and AC sampling equipment. Background technique [0002] In the current AC sampling schemes used for AC equipment such as motor protectors in the market, frequency tracking is generally not performed. In this way, when the signal frequency deviates from 50Hz, the actual signal will be out of sync with the sampled signal, resulting in large errors. Of course, some people also use the zero-crossing method for frequency tracking, but there are also some problems. For example, when the signal is distorted near the zero point, the frequency sampling is prone to errors; and the response time is relatively long, such as the solution of the metering chip, the response time is determined by the update rate of the metering chip, for example, some metering chips need about 0.3s Wait. Therefore, in the case where fast sam...
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IPC IPC(8): G01R23/02
CPCG01R23/02
Inventor 柳首超张深杰陈胜男高平徐初功张旭俊陈晓军阳丹红
Owner ZHEJIANG TENGEN ELECTRIC