A digital input filter circuit

By designing a digital input filtering circuit, combined with a composite transient suppression unit, a dynamic time window filtering unit, and a fault diagnosis unit, the problems of existing filtering circuits being unable to simultaneously handle fast and slow signal responses, consuming CPU resources, and failing to detect channel faults are solved, thus achieving a balance between signal stability and emergency stop response speed.

CN224356086UActive Publication Date: 2026-06-12SHENZHEN FEILING ELECTRONIC TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
SHENZHEN FEILING ELECTRONIC TECHNOLOGY CO LTD
Filing Date
2025-07-30
Publication Date
2026-06-12

AI Technical Summary

⚠Technical Problem

Existing filtering circuits cannot meet the response requirements of both fast and slow signals, consume CPU resources, and TVS diodes cannot eliminate signal distortion or detect channel faults.

⚗Method used

A digital input filtering circuit was designed, which includes a composite transient suppression unit, a dynamic time window filtering unit, and a fault diagnosis unit. It utilizes components such as a gas discharge tube, a TVS tube, a π-type LC filter, a Hall current sensor, and a window-adjustable comparator to achieve adaptive signal filtering and fault diagnosis.

🎯Benefits of technology

It achieves a balanced response to both fast and slow signals, reduces CPU resource consumption, effectively eliminates signal distortion and detects channel faults, and improves signal stability and emergency stop response speed.

✦ Generated by Eureka AI based on patent content.

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Abstract

This invention provides a digital input filtering circuit, including a composite transient suppression unit, a dynamic time window filtering unit that automatically adjusts the effective level determination window time based on the historical signal jump frequency, and a fault diagnosis unit. The composite transient suppression unit includes a gas discharge tube, a TVS tube, and a π-type LC filter connected in series. The fault diagnosis unit monitors the input current through a Hall current sensor and injects coded self-test pulses to verify channel integrity. The dynamic time window filtering unit includes a window-adjustable comparator (LM2903), whose reference voltage is dynamically set by a DAC; a jump interval statistics module that stores the timestamps of the most recent 16 signal edges; and also includes the positive and negative output terminals of a rectifier circuit and the primary side of a flyback circuit. In practical applications, it can achieve a good balance between the stability of conventional signals and the emergency stop response speed.
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