Multi-phase power parameter synchronous acquisition circuit

Abstract

Disclosed is a multi-phase power parameter synchronous acquisition circuit used for synchronously acquiring multi-phase power parameters of an intelligent digital instrument and an intelligent measurement and control device. The circuit comprises an AD converter, a programmable device and a microcontroller MCU, wherein the AD converter is connected to the programmable device which is connected to the microcontroller MCU; the AD converter is composed of a serial AD converter I, a serial AD converter II, a serial AD converter III, a serial AD converter IV, a serial AD converter V, a serial AD converter VI and a serial AD converter VII; and the programmable device adopts an FPGA / CPLD. Parameters in multiple paths can be acquired simultaneously through the multiple serial AD converters and the programmable device FPGA / CPLD, and the acquisition of signals in one path and conversion of the acquired data can be carried out by one AD converter so as to realize interface with the microcontroller MCU. The multi-phase power parameter synchronous acquisition circuit of the invention has the advantages of accurate detection, simple structure, convenient use, reliable operation and optimized cost.

Description

technical field [0001] The invention relates to a data acquisition application circuit of an intelligent digital instrument and an intelligent measurement and control device, in particular to a synchronous acquisition circuit of multi-phase electric energy parameters. Background technique [0002] In a three-phase electric energy parameter detector, it is usually necessary to use an AD converter to realize current, voltage, power, power factor, frequency, neutral current, electric energy and other parameters collection. Under normal circumstances, a single-chip AD converter can be used in the detection system to collect the measured parameters in turn, so that there is a time difference in signal collection. In fact, the value of the measured signal changes with time. Although the AD converter is fast and the difference in acquisition time of different parameters is small, there are still differences after all. This difference in sampling time is directly related to the meas...

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Problems solved by technology

In fact, the value of the measured signal changes with time. Although the AD converter is fast and the difference in acquisition time of different parameters is small, there are still differences after all. This difference in sampling time is directly related to the measured Accuracy of parameters

In the prior art, since most AD converters are in the form of parallel interfaces, single-chip parallel interface AD ​​converters cannot accurately collect the measured parameters in real time, and multi-chip parallel interface AD ​​converters have complex structures, low reliability, Disadvantages of increased fees and costs

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