Method for detecting industrial frequency ac electric period change

The invention is a method of catching the periodic variation of the industrial frequency AC, including the catching circuit, consisting of the rectifier, the constant current converter and the current comparer. It includes the following steps: 1. rectify the AC and output it to the converter; 2. whe...

Full description

Saved in:
Bibliographic Details
Main Authors BIN LI, TIANFEI SHEN, JUN YAO
Format Patent
LanguageEnglish
Published 22.10.2003
Edition7
Subjects
MEASURING
MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUIDLEVEL
METERING BY VOLUME
PHYSICS
TESTING
Online AccessGet full text

Cover

More Information
Summary:The invention is a method of catching the periodic variation of the industrial frequency AC, including the catching circuit, consisting of the rectifier, the constant current converter and the current comparer. It includes the following steps: 1. rectify the AC and output it to the converter; 2. when the energy input into the converter reaches the preset voltage value, the converter outputs constant current I0; 3. input I0 on the input ends of the current comparer and compare with the reference current preset by the converter; the square wave output by the comparer is an industrial frequency AC periodic variation signal, which is input into microprocessor for the following processing. It can eliminate the interference signals in the electric network and precisely catch the periodic variation.
Bibliography:Application Number: CN2003116540