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Let’s see how the explosion-proof magnetic starter for mining applications resists interference.

2022-07-07

　　The mining explosion-proof magnetic starter uses a microcontroller as its central control unit, integrating features such as thyristor-based power-control triggering, bidirectional communication, and both static and dynamic self-diagnosis for fault detection. This design enables start-up control under explosion-proof conditions. However, high-power components—both in the strong-current and weak-current sections—can generate significant interference. Therefore, ensuring the anti-interference capability of the mining explosion-proof magnetic starter has become a critical challenge.

　　Interference affects three key areas in a typical microcontroller system. First is the input channel, which causes distortion of analog signals and errors in digital signals. Second is the output channel, leading to chaotic output signals and potentially severe consequences. Finally, there’s the microcontroller system’s three buses.

　　The winning anti-interference system is an organically integrated combination of hardware and software. While the hardware boasts high interference resistance and strong real-time performance—though its effectiveness comes at the cost of increased device size—the software, on the other hand, offers lower speed and reduced operational efficiency. By keeping these two components distinctly separate yet harmoniously integrated, the system achieves both high performance and optimal adaptability to various interference scenarios. Hardware-based interference signals can be categorized into common-mode interference and differential-mode interference.

　　Crosstalk interference refers to signals that are superimposed onto the input signal or sneak into the system via power lines. Therefore, anti-interference circuits should be strategically placed along these interference pathways. For instance, an anti-interference voltage regulator power supply is particularly effective because the power lines supplying the microcontroller-based control system often serve as the primary route for interference signals. To mitigate these disruptive effects, the following measures can be implemented: use isolation transformers and noise filters; connect filtering capacitors in parallel with rectifier components; and employ high-quality voltage regulation circuits.

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