Battery Fault Detection Circuit for Rapid Vehicle Loop Isolation

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Solution Overview

Problem

Existing vehicle control systems lack a comprehensive solution to disconnect target loops in response to both collisions and battery faults, which can lead to potential damage or explosion.

Innovation Solution

A control circuit with a current detection unit and driver circuit that detects overcurrent or short circuits in the battery, outputting signals to disconnect safety modules in target loops, including connections to airbag systems and supplementary driver circuits for redundancy and faster disconnection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a battery management module sends a collision signal to disconnect the target loop, then the target loop can be disconnected in collision cases, but the disconnection speed is slow and there is no solution for battery fault cases

Engineering Contradiction:

Improvetarget loop disconnection reliabilityVSAvoidtarget loop disconnection time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The control circuit is segmented into independent functional modules: current detection unit, driver circuit, and safety module. Each module performs a specific function, allowing parallel processing of detection and control tasks, which improves both response speed and reliability without requiring sequential operations

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The driver circuit serves as an intermediary between the current detection unit and the safety module. It receives detection signals and translates them into appropriate control signals for the safety module, enabling fast and reliable disconnection while isolating the detection logic from the execution logic

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If only a single driver circuit is used to control the safety module, then the device complexity is low, but the system reliability is insufficient when fast disconnection is critical

Engineering Contradiction:

Improvesafety module control reliabilityVSAvoidcontrol circuit complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The control circuit provides different control paths for different fault conditions: the driver circuit handles normal collision cases, while the supplementary driver circuit handles critical battery faults. Each driver circuit is optimized for its specific function, improving overall reliability without making the entire system overly complex

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The supplementary driver circuit is pre-configured and ready to take over immediately when the primary driver circuit fails or when critical battery faults are detected. This preliminary preparation ensures fast response for critical failures without requiring complex real-time decision logic

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20260014949A1Control circuit, control system, and transportation device

Publication Date: 2026.01.15 CONTEMPORARY AMPEREX TECHNOLOGY CO LTD

AI summary

A control circuit includes: a current detection unit, where the current detection unit is configured to: when being connected to a battery, output a first type signal when detecting that the battery has an overcurrent or a short circuit; and a driver circuit, where an input terminal of the driver circuit is connected to a signal output terminal of the current detection unit, an output terminal of the driver circuit is configured to connect to a safety module in the target loop, and the driver circuit is configured to output, in response to receiving the first type signal transmitted from the current detection unit, a drive signal to drive the safety module to be disconnected, where the target loop is a loop in the battery or a loop in a device in which the battery is located.