Back-Gate Comparison Circuit for Low-Power Battery Abnormality Detection
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Solution Overview
Problem
Existing battery control circuits face challenges in reducing power consumption while effectively detecting abnormalities such as overdischarging, overcharging, and short circuits in multi-cell battery stacks.
Innovation Solution
A semiconductor device with a novel comparison circuit and amplifier circuit structure using transistors with back gates and capacitors, which compares signals and controls battery charging and discharging based on voltage and current data, reducing power consumption by optimizing transistor states and potential applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional battery control circuits are used to detect abnormalities in multi-cell battery stacks, then abnormality detection function is provided, but power consumption is high
Solution Approach 1:
The battery control circuit is divided into multiple independent comparison circuits, each responsible for comparing voltages of specific battery cells. This segmentation allows the system to activate only the necessary comparison circuits based on the number of cells and detection requirements, reducing overall power consumption while maintaining comprehensive abnormality detection capability.
Solution Approach 2:
The invention changes the operating parameters of the comparison circuits by controlling their activation states. The control circuit selectively activates or deactivates comparison circuits based on battery configuration and operational conditions, optimizing power consumption while ensuring reliable abnormality detection when needed.
2Reliability
If multiple comparison circuits are added to handle multi-cell battery stacks, then abnormality detection coverage is improved, but device complexity increases
Solution Approach 1:
Each comparison circuit is designed as a universal module capable of comparing voltages between any two battery cells. The control circuit configures these universal comparison circuits to handle different battery configurations (series, parallel, or combinations), eliminating the need for dedicated comparison circuits for each cell pair and reducing overall system complexity.
Solution Approach 2:
The system dynamically configures the activation and connection of comparison circuits based on the battery stack configuration and operational requirements. The control circuit enables or disables specific comparison circuits as needed, allowing the system to adapt to different battery arrangements without requiring a fixed complex circuit structure for all possible configurations.
3Reliability
If continuous monitoring is performed to ensure battery safety, then detection reliability is maintained, but power consumption increases
Solution Approach 1:
The comparison circuits operate in a periodic manner rather than continuously. The control circuit activates comparison circuits at specific intervals or under specific conditions (such as during charging/discharging operations), maintaining reliable abnormality detection capability while significantly reducing power consumption during idle or low-risk periods.
Solution Approach 2:
The system performs preliminary checks by comparing battery cell voltages against predefined thresholds before abnormalities develop into critical issues. The control circuit proactively activates comparison circuits to detect potential problems early, maintaining safety reliability while allowing periods of reduced monitoring activity when battery conditions are stable.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables efficient detection and control of battery abnormalities with reduced power consumption, enhancing the performance and longevity of power storage devices.
Implementation Method 1
The first transistor includes a back gate; one of a source and a drain of the first transistor is electrically connected to one of a source and a drain of the second transistor and one of a source and a drain of the third transistor
Data Source
AI summary
A novel comparison circuit, a novel amplifier circuit, a novel battery control circuit, a novel battery protection circuit, a power storage device, a semiconductor device, an electric device, and the like are provided. In a semiconductor device, one of a source and a drain of a first transistor is electrically connected to one of a source and a drain of a second transistor and one of a source and a drain of a third transistor; the other of the source and the drain of the third transistor is electrically connected to a first output terminal; and the other of the source and the drain of the second transistor is electrically connected to a second output terminal. The semiconductor device has a function of outputting a comparison result of a signal supplied to a gate of the second transistor and a signal supplied to a gate of the third transistor, from the first output terminal and the second output terminal; and a function of changing the potential output from the first output terminal in accordance with the potential applied to a back gate of the first transistor.