A wide-range, high-precision voltage detection circuit for cathodic protection posts

Abstract

This utility model relates to a wide-range, high-precision voltage detection circuit for cathodic protection piles. It includes a high-voltage pre-detection protection circuit, a programmable resistor circuit, a single-ended to differential circuit, and a 32-bit Σ-Δ ADC converter. The high-voltage pre-detection protection circuit and the programmable resistor circuit work together to output a minimum resistance sequence for the initial detection of the measured voltage, avoiding damage to subsequent circuits and providing a reference for range switching. The programmable resistor circuit outputs different resistance voltages via an AD5325, enabling multi-range switching to meet different measurement needs. The single-ended to differential circuit converts the reduced voltage into a differential voltage, covering all positive and negative ranges. The 32-bit Σ-Δ ADC converter has a solid-state protection switch at the front end, providing high-precision digital conversion and ensuring measurement accuracy. This utility model is suitable for on-site detection of cathodic protection systems in oil pipelines, ships, and other environments with complex DC interference such as subway tracks, and has broad application prospects and practical significance.

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