Abstract:

To address the inherent drawbacks of traditional electromagnetic contactors,such as mechanical wear,arc ablation,slow response speed,and insufficient reliability,a contactless contactor based on all-solid-state power electronics technology is designed and implemented.The system adopts a modular architecture,utilizing SiC MOSFET as the core switching device,and constructs a closed-loop control circuit comprising power conversion,signal isolation,trigger control,sampling feedback,and RC snubber circuits.Through the optimized design of input filtering and isolated driving,safe isolation and efficient drive between the control loop and the main power loop are achieved.Combined with the zero-crossing triggering and dynamic sampling mechanisms,the switching response speed and anti-interference capability are significantly improved.Test results indicate that the contactor achieves microsecond-level switching response,completely eliminates arc and mechanical wear problems,and demonstrates excellent electromagnetic compatibility and low conduction loss characteristics.It shows significant advantages over traditional contactors in terms of reliability,service life,and comprehensive performance,making it suitable for high-demand application scenarios such as industrial automation and smart grids.

Key words: contactless contactor, voltage sampling, trigger circuit, isolated control, RC filter