Abstract: Aiming at the problems that the speed of identifying the lightning signal waveform was slow and inaccurate of the traditional two-dimensional lightning detector, and the data quality was affected by the aging of the components, and the number of components was large, the integration was low, the reliability was poor, and the upgrade space was small. It could only work with linear power supply, and the power supply stability was strictly required. Through the ultra-large field programmable gate array, on-chip programmable system and modern electronic surface mount technology, the anti-interference three-dimensional lightning detector was developed. The detector antenna adopted orthogonal ring structure and was equipped with shielding cover to improve the accuracy of received signal and avoid antenna effect. The front channel board applied large-scale integrated circuits, surface mount components and multilayer board technology to reduce the background noise of the output signals. Based on the embedded soft core, the signal processing board flexibly constructed the central processor to quickly identify the lightning waveform. The power supply module used the switching power supply with strong adaptability and high conversion efficiency to obtain a variety of voltages. The design realized a stable and low-power three-dimensional lightning detector.

Key words: three-dimensional lightning, circuit system, signal processing, switching power, conversion efficiency