METHOD AND DEVICE FOR MEASURING A CURRENT FLOWING THROUGH A SWITCH

The invention relates to a method and a device (1) for measuring a current (Ix) flowing through a switch (2) which has an unknown inner resistance (Rs) and two connections (3 , 4), a voltage difference (u8) being measured at the switch. During operation, the current (ip) provided by an AC voltage so...

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Bibliographic Details
Main Author NEIC ,AUREL -VASILE
Format Patent
LanguageEnglish
Published 11.09.2015
Subjects
MEASURING
MEASURING ELECTRIC VARIABLES
MEASURING MAGNETIC VARIABLES
PHYSICS
TESTING
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Summary:The invention relates to a method and a device (1) for measuring a current (Ix) flowing through a switch (2) which has an unknown inner resistance (Rs) and two connections (3 , 4), a voltage difference (u8) being measured at the switch. During operation, the current (ip) provided by an AC voltage source (6), which is part of an AC voltage circuit (5) connected in parallel to the switch (2) , is superimposed on the current (Ix) to be measured, said current flowing through the switch (2) , by means of the AC voltage source , wherein both the amplitude (Ip) and the frequency (pf) of the current (ip) provided by the AC voltage source (6) are known. An AC voltage component (up) of the voltage difference (us) and the amplitude (Up) of the component are ascertained , and the current (Ix) between the connections (3 , 4) is ascertained and output proportionally to the amplitude (Ip) of the current (ip) of the AC voltage source (6).
Bibliography:Application Number: IN2015DELNP2557