INTEGRATING CIRCUIT FOR ROGOWSKI COIL

• Main Authors: FUKUI NOBUTAKA, OTSUBO AKIRA
• Format: Patent
• Language: English
• Published: 26.02.1999
• Edition: 6
• Subjects: BASIC ELECTRONIC CIRCUITRY; ELECTRICITY; IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; RESONATORS; TESTING

PROBLEM TO BE SOLVED: To provide an inexpensive integrating circuit for Rogowski coil to allow trusty integration even in a measured current with a short wave front time and a long wave tail time. SOLUTION: This circuit is constituted of the first circuit part A comprising a resistance 10 of resistance value R1 and a capacitor 11 of capacitance C1 connected in parallel, and of a second circuit part B comprising a resistance 12 of resistance value R2 connected to an output side of the first circuit part A in series, a capacitor 13 of capacitance C2 , a resistance 14 of resistance value R3 and an operation amplifier 15 to take as a noninversion input a voltage voltage-dropped by the resistance 12 of resistance value R2 . Relation between resistance values and capacitances in respective resistances and capacitors is set to satisfy an expression C1 (R1 R2 )/(R1 +R2 )=C2 R3 so as to provide an output voltage v0 of an integrated waveform expressed as v0 = -/C2 (R1 + R2 )}∫vi dt, where v0 is an output voltage of a Rogowski coil as an input voltage and v0 is an output voltage for the input voltage vi .