Cell Sampling Circuit Impedance Monitoring for Transformer Fault Warning
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Solution Overview
Problem
Existing battery management systems face issues with communication interruptions in cell sampling circuits due to transformer faults, leading to incomplete data collection and necessitating immediate battery disconnection, which inconveniences users and affects experience.
Innovation Solution
A cell sampling circuit design with a daisy-chain communication structure, where each unit monitors the impedance of transformer units to detect abnormalities before communication failure, enabling early warnings for potential transformer disconnections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the cell sampling circuit uses a daisy-chain communication structure with transformer units, then the system can maintain compact wiring and communication between units, but the transformer windings are susceptible to pulling up and disconnection faults that interrupt communication
Solution Approach 1:
The patent implements impedance detection before communication failure occurs. Each target unit continuously monitors the impedance of connected transformer units, detecting abnormalities in the winding state before they lead to complete disconnection and communication interruption, allowing for early warning and preventive action
Solution Approach 2:
The patent establishes a feedback mechanism where impedance detection results are used to control system operation. When impedance abnormalities are detected, the system provides early warning information and can adjust communication strategies or alert users, creating a closed-loop system that responds to transformer state changes
2Reliability
If the system continuously monitors impedance of transformer units, then early detection of winding abnormalities is achieved, but additional detection circuitry and processing increase system complexity
Solution Approach 1:
The patent makes existing communication circuit components perform dual functions: they maintain daisy-chain communication between units while simultaneously serving as impedance detection circuits. The same communication lines and basic measurement capabilities are used for both data transmission and transformer winding state monitoring, eliminating the need for completely separate detection hardware
Solution Approach 2:
The patent enables each target unit to autonomously perform impedance detection of its connected transformer units using its own internal circuitry. Each unit independently measures impedance, processes the data, and generates early warning information without requiring external monitoring equipment, allowing the system to self-diagnose transformer abnormalities
Data Source
AI summary
A cell sampling circuit includes a plurality of target units sequentially connected in a series connection in a daisy-chain communication manner and one or more transformer units each connected between two successive target units of the plurality of target units. Each of the target units is configured to acquire an impedance of at least one transformer unit connected to the target unit, and judge, based on the acquired impedance, whether to perform circuit abnormality early warning.