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Phase angle measuring instrument

A phase angle and point detection technology, which is used in measuring devices, measuring electrical variables, and the phase angle between voltage and current. Intuitive, high measurement accuracy, scientific measurement method effect

Inactive Publication Date: 2004-04-07
山东建筑工程学院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has two major defects: first, the measurement accuracy is low, and the error can reach 5 degrees, which is far from meeting the needs of scientific research and production; second, the personal risk is great, and the equipment is easy to be damaged
In this case, the tester must also take extra care to keep the insulation between the body and the earth, otherwise an electric shock accident will occur

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: the circuit structure of the present invention is as figure 1 , figure 2 shown. The leading signal processing circuit 1 is sequentially connected with the leading signal crossing "0" point detection circuit 4 and the leading signal photoelectric isolation circuit 5, and the leading signal photoelectric isolation circuit 5 is respectively connected with the phase angle pulse forming circuit 7 and the single-chip microcomputer circuit 8 at the same time; the lagging signal processing The circuit 2 is sequentially connected with the lag signal crossing "0" point detection circuit 4, the lag signal photoelectric isolation circuit 6 and the phase angle pulse forming circuit 7; the phase angle pulse forming circuit 7 is connected with the single-chip microcomputer circuit 8, and the single-chip microcomputer circuit 8 is connected with the electrical angle display circuit 9 connection; the power supply isolation circuit 10 that provides working current is resp...

Embodiment 2

[0033] Embodiment 2: The circuit structure and working method of the present invention are the same as Embodiment 1, wherein the RS flip-flop in the phase angle pulse forming circuit 7 is formed by an integrated circuit of "NOR gate".

Embodiment 3

[0034] Embodiment 3: The circuit structure and working mode of the present invention are the same as Embodiment 1, and the RS flip-flop in the phase angle pulse forming circuit 7 is formed by a 74L71 ASIC.

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Abstract

The phase angle measuring instrument consists of leading signal processing circuit, lagging signal processing circuit, lagging signal zero-crossing point detecting circuit, leading signal zero-crossing point detecting circuit, leading signal photoelectronic isolating circuit, lagging signal photoelectronic isolating circuit, phase angle pulse forming circuit, monochip computer circuit, electric angle display circuit and power source isolating circuit connected electrically. The phase angle measuring instrument can measure phase angle accurately and display it in display directly. The photoelectronic isolation ensure safe.

Description

(1) Technical field [0001] The invention relates to a phase angle measuring instrument, which belongs to the technical field of electronic measurement. (2) Background technology [0002] In the field of electronic measurement technology, the phase angle is a very important technical parameter. At present, the measurement of the phase angle mainly uses a dual-trace oscilloscope to estimate by observing the waveform. This method has two major defects: first, the measurement accuracy is low, and the error can reach 5 degrees, which is far from meeting the needs of scientific research and production; second, the personal risk is great, and the equipment is easy to be damaged. Especially in the field of power electronics technology, when using a dual-trace oscilloscope to measure the phase angle between the AC passing through the "0" point and the thyristor conduction moment, for safety, the probe ground terminals of the two input signals of the dual-trace oscilloscope are requi...

Claims

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Application Information

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IPC IPC(8): G01R25/00
Inventor 李全民
Owner 山东建筑工程学院
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