ABNORMAL CURRENT DETECTING CIRCUIT

PURPOSE:To achieve detection and resetting of over current simply with increase in the load or the like while energy consumption is limited as flowing into a load to the time of the detection of the eddy current by arranging a current- voltage converter, an amplifier, a wind comparator and an abnorm...

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Bibliographic Details
Main Authors YAMAJI KIMINORI, YAEJIMA MAMORU
Format Patent
LanguageEnglish
Published 16.09.1983
Subjects
MEASURING
MEASURING ELECTRIC VARIABLES
MEASURING MAGNETIC VARIABLES
PHYSICS
TESTING
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Summary:PURPOSE:To achieve detection and resetting of over current simply with increase in the load or the like while energy consumption is limited as flowing into a load to the time of the detection of the eddy current by arranging a current- voltage converter, an amplifier, a wind comparator and an abnormal signal transmitting means. CONSTITUTION:A reference voltage E1 is so set that no output OUT1 is produced from a differential amplifier 7 when current flows at a normal value in such a manner that current from a power source 1 is converted into voltage and adjusted with a variable resistance R0. On the other hand, the voltage of the variable resistance R0 is inputted into another differential amplifier 6 to adjust the reference voltage so that the differential amplifier 6 is operated to provide an output OUT2 when the input reaches E1+E2. As the output OUT2 is eliminated by adjusting the variable resistance R0, the actual load current can be detected, which in turn enables automatic setting of an over-current detecting point with a preset over-current detection width (E2) in the differential amplifier 6. Thus, the resetting of the over-current detection can be performed simply.
Bibliography:Application Number: JP19820039160