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Multipath alternating current split-phase synchronous sampling method and circuit

A synchronous sampling and circuit technology, applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve the problems of phase difference, AC volume acquisition deviation, etc., achieve the effect of improving data accuracy, sampling signal stability, and saving hardware resources

Active Publication Date: 2016-07-06
SHANDONG LUNENG SOFTWARE TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The asynchronous sampling of the same AC volume will produce a phase difference, resulting in deviations in the AC volume acquisition, requiring complex compensation methods for compensation and calibration

Method used

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  • Multipath alternating current split-phase synchronous sampling method and circuit
  • Multipath alternating current split-phase synchronous sampling method and circuit
  • Multipath alternating current split-phase synchronous sampling method and circuit

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0025] Such as figure 1 As shown, the multi-channel AC phase-separated synchronous sampling circuit includes multiple multi-channel analog switches, and the three phases A, B, and C of the AC analog quantity are respectively connected to a multi-channel analog switch, and each multi-channel analog switch is connected to One input channel of the high-speed synchronous sampling AD converter, the output terminal of the high-speed synchronous sampling AD converter is connected to the MCU processor. The MCU processor uses the FSMC bus interface to control AD ​​conversion and read the conversion results. The MCU processor controls the synchronous switching of each multi-channel analog switch to ensure synchronous sampling of the AC traffic of each phase.

[0026] figure 2 It is a circuit implementation method of this scheme. The multi-channel analog switch...

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Abstract

The invention discloses a multipath alternating current split-phase synchronous sampling method and circuit. An A-phase alternating current quantity channel is gated by multipath analog switches and AD conversion is controlled to be started; after completion of conversion, a B-phase alternating current quantity channel is gated, and an A-phase conversion result is read to the internal RAM of an MCU processor; after time of T / (N*3), AD conversion is started, a C-phase phase alternating current quantity channel is gated after completion of conversion, and a B-phase conversion result is read to the internal RAM of the MCU processor; after time of T / (N*3), AD conversion is started, the A-phase alternating current quantity channel is gated after completion of conversion, and a C-phase conversion result is read to the internal RAM of the MCU processor so that sampling of one point is completed by three-phase alternating current quantity; and after time of T / (N*3), the steps are repeated to perform N sampling and then cyclic sampling of three-phase alternating current signals is completed. 2 / 3 of the A / D conversion channel is saved, utilization rate of the A / D conversion channel is enhanced, hardware resources are saved and hardware cost is reduced.

Description

technical field [0001] The invention relates to the technical field of power system sampling, in particular to a multi-channel AC phase-splitting synchronous sampling method and circuit. Background technique [0002] The same measurement device in the power system needs to collect a large amount of AC power, and in order to maintain the synchronization of each sampling point, it is necessary to start sampling for different sampling points at the same time, so it is particularly important to maintain the synchronization of sampling. [0003] In order to ensure the synchronization of sampling, the more common solution is to use AD conversion chips with high-precision, high-speed synchronous sampling functions. When it is necessary to collect multiple channels of AC signals, the number of AD channels is relatively large, and the cost is high. The asynchronous sampling of the same AC volume will produce a phase difference, resulting in deviations in AC volume acquisition, and a...

Claims

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Application Information

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IPC IPC(8): G01R31/00
CPCG01R31/00
Inventor 代后兆孟祥军李伟硕高彦斌纪洪伟
Owner SHANDONG LUNENG SOFTWARE TECH
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