An AC acquisition device and data acquisition method thereof

Abstract

The invention discloses an alternating current acquisition device and a data acquisition method thereof. The alternating current acquisition device comprises a DSP (digital signal processor) processor and a singlechip which is connected with the DSP, wherein after being subjected to precision resistance voltage division, alternating current voltages of phase-A, phase-B and phase-C are boosted to voltage direct current signals with effective values of 0.7-1V from a reference voltage of 1.65V; the voltage direct current signals are processed into voltage values of 0-3.3V through an operational amplifier, and subsequently output to an analog / digital (A / D) conversion input port of the DSP processor; after passing through a current transformer, alternating currents of phase-A, phase-B and phase-C are boosted to small voltage direct current signals with effective values of 0.7-1V from the reference voltage of 1.65V; the small voltage direct current signals are processed into voltages of 0-3.3V through another operational amplifier and are subsequently output to the A / D conversion input port of the DSP processor; and at the same time, the small voltage direct current signals (with effective values of 0.7-1V) converted from the alternative voltages of phase-A, phase-B and phase-C are fed into a hysteresis comparator and output to a CAP port of the DSP. By utilizing the alternating current acquisition device and the data acquisition method, the requirement of the system on the precision can be met.

Description

technical field [0001] The invention relates to the field of electric power data acquisition, in particular to an AC acquisition device and a data acquisition method thereof. Background technique [0002] In some industrial and mining enterprises, it is often necessary to monitor power parameters in order to ensure the quality of power supply and product quality. At present, the AC acquisition device is mainly designed with 8-bit single-chip microcomputer or 16-bit DSP. However, the data processing capability of the single-chip microcomputer is insufficient, and it is difficult to obtain comprehensive power parameter data; and in the existing DSP-based system, if the single-DSP system uses the more expensive TMS320F28 series chip, the cost will be higher; if the general-purpose TMS320F24 series chip is selected , due to the low speed, the function is limited; and in the system combining TMS320F24 series chips and 8-bit single-chip microcomputer, the single-chip microcompute...

AI Technical Summary

Problems solved by technology

However, the data processing capability of the single-chip microcomputer is insufficient, and it is difficult to obtain comprehensive power parameter data; and in the existing DSP-based system, if the single-DSP system uses the more expensive TMS320F28 series chip, the cost will be higher; if the general-purpose TMS320F24 series chip is selected , due to the low speed, the function is limited; and in the system combining TMS320F24 series chips and 8-bit single-chip microcomputer, the single-chip microcomputer is used to collect instantaneous current and voltage signals, and only the DSP chip is used to complete the parameter calculation task

However, the acquisition accuracy of the 8-bit single-chip microcomputer is insufficient, and it is difficult to ensure the calculation accuracy of the AC parameters.

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