Low frequency compensation circuit of current transformer

Published:2011/9/15 0:02:00 Author:Sophia | Keyword: Low frequency compensation, current transformer | From:SeekIC

Figure 1 shows the circuit, when the OP amplifier A as the current is inputed into amplifier and visible load resistance R of CT is 0. This circuit can significantly improve the low frequency characteristics. When the gain of low-frequency domain needs to be compensated, the feedback capacitor CF can be inserted into . In this circuit, to prevent the OP amplifier A becoming into open-loop in the DC area and composing of the DC open-loop (fc ≈ 1.6Hz) in the non-inverting integrator A2 (commonly known as the DC servo circuit), this circuit's output voltage v is: If RF = 50kΩ, then i = 10mA, which can be transformed as 1V. The value of this capacitor CF is decided by the CF characteristics of short-circuit, so it can be obtained by the experiment. The 47pF capacitor parallelling with FR is to suppress high-frequency characteristics, no special basis.



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