Eis sampling circuit, hydrogen fuel cell system, and vehicle

By designing an EIS sampling circuit using voltage divider and differential amplification, the problem of voltage spikes breaking down low-voltage devices is solved, enabling accurate signal analysis and improved circuit stability. This design is suitable for monitoring fuel cell stacks in hydrogen fuel cell systems and vehicles.

CN224354554UActive Publication Date: 2026-06-12SHINRY TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
SHINRY TECH
Filing Date
2025-06-09
Publication Date
2026-06-12

AI Technical Summary

⚠Technical Problem

The existing EIS sampling circuit suffers from voltage spikes that break down low-voltage devices due to transient analysis of the large-capacity DC blocking capacitor during low-frequency harmonic injection, causing circuit damage and affecting the stability and reliability of the fuel cell stack.

⚗Method used

The system employs a voltage divider module and a DC blocking amplifier module. The EIS voltage signal is split into two paths by a splitting processing unit, and then differential amplification is performed by a differential amplifier unit to extract the AC component and suppress the DC component, thereby avoiding the impact of high voltage spikes on low voltage devices.

🎯Benefits of technology

It effectively separates AC and DC components, ensuring the accuracy of signal analysis, avoiding high voltage spikes at the moment of power-on of the fuel cell stack, improving circuit stability and reliability, and enhancing the circuit's anti-interference capability and detection accuracy.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to an EIS sampling circuit, hydrogen fuel cell system and vehicle, including partial pressure processing module and direct -current isolation amplifier module, and the input of direct -current isolation amplifier module is connected with the output of partial pressure processing module, and direct -current isolation amplifier module includes partial circuit processing unit and differential amplifier unit, and the output of partial circuit processing unit is connected in the input of differential amplifier unit, wherein, partial circuit processing unit includes first branch and second branch, and the input of first branch is connected in the input of second branch, and the output of first branch is connected in the first input of differential amplifier unit, and the output of second branch is connected in the second input of differential amplifier unit, and first branch is provided with alternating current filter, and the output of alternating current filter is connected in the first input of differential amplifier unit, thereby, realized the separation to alternating current component and direct current component, ensured that the output signal only has alternating current component, provides accurate guarantee for subsequent analysis.
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