Design of an anti-interference lightning current acquisition module

To improve the anti-interference performance of a lightning current acquisition device, a redundant signal conditioning channel is adopted, i.e., an additional signal acquisition channel is provided to acquire the lightning current signal, and a dual-channel ADC is applied to acquire the two lightning current signals induced by the same conductor simultaneously. Then, the acquired data are sent to a DSP for similarity matching. If the similarity reaches the set value, the two lightning current data are considered to be matched and the lightning current data are determined to be valid and then stored, otherwise discarded, waiting for the arrival of next data. In this way, the interference signals are eliminated with true lightning current signals being retained only while the lightning current characteristic parameters are acquired and the lightning current signal waveform is reproduced, thereby improving the accuracy of lightning current monitoring. Also, this saves valuable storage resources, improves the processing efficiency and ensures real-time monitoring.