High-precision fast measuring circuit and method for wide-range currents in power system
A power system and measurement circuit technology, applied in the field of high-precision and fast measurement circuits, can solve problems such as affecting measurement speed, and achieve the effects of improving measurement accuracy, good scalability, popularization and application value, and fast measurement speed.
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[0037] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0038] like figure 1 and 2 As shown, the high-precision and fast measurement circuit for wide-range current in the power system includes: current transformer 1, signal conditioning circuit, limiter 5, A / D converter 6 and CPU7 connected in sequence,
[0039] The signal conditioning circuit includes a preamplifier 2, a main amplifier 3, and an adaptive amplifier 4 connected in sequence, the preamplifier 2 is connected with the current transformer 1, and the adaptive amplifier 4 is connected with the limiter 5,
[0040]The node between the main amplifier 3 and the adaptive amplifier 4 is connected with three branches, and each branch is provided with an average value extraction circuit 8 and a voltage comparator 9 connected in sequence, wherein the average value extraction circuit 8 is connected to The input end of adaptive amplifier 4, voltage comparator ...
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