Low-voltage power signal phase difference measuring device

Abstract

The invention relates to a low-voltage electric power signal phase difference measuring device which comprises a voltage and current conversion device, a zero-crossing comparison device, a phase discriminator and a single-chip microcomputer, and is characterized in that the voltage and current conversion device is connected with an external power supply to be detected and is connected with the phase discriminator through the zero-crossing comparison device; the output end of the phase discriminator is connected with an external interruption port of the single-chip microcomputer, and the output port of the single-chip microcomputer is connected with a display. According to a phase difference detection circuit, the zero-crossing comparison device is used for converting sine waves of voltage and current signals into square waves so as to measure the phase difference. The single-chip microcomputer carries out timing and counting on phase difference signals output by the phase discriminator, so that counting of signal periods T and phase differences of the same frequency and different phases is achieved, and then phase difference calculation and analysis of input voltage and current signals are achieved. The low-voltage power signal phase difference measuring device is simple and reliable in hardware structure, simple to operate, convenient to use and high in working efficiency.

Description

technical field [0001] The invention relates to the technical field of power detection, in particular to a low-voltage power signal phase difference measurement device. Background technique [0002] As a very important signal feature detection method, phase difference measurement technology has been widely used in high-tech fields such as power electronics. Most domestic phase measurement systems are designed and implemented with analog circuits. Due to the inherent zero-point drift defect in the transmission of analog circuits, the measurement accuracy of this type of phase measurement system is not high. In the power system, it is necessary to measure the phase difference between voltage and current in real time to ensure the economy and stability of power supply. [0003] There are many methods of phase difference detection. The traditional methods mainly rely on analog devices, such as diode phase detection method, vector method and pulse counting method. The effect of...

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Problems solved by technology

[0004] At present, there is a big gap between my country's phase difference detection technology and developed countries such as the United States, mainly manifested in fewer types of products, fewer supporting products, low precision, low level of digitization, poor real-time performance, single function, and insufficient measurement standards.

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