Thermistor-Coupled Charge Current Regulation for Battery Charging
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Solution Overview
Problem
Existing battery management systems face challenges in regulating charge current effectively, particularly in high-current batteries used in aeronautics and aerospace, where temperature increases can lead to variations in load current beyond acceptable limits, and initial overcurrents or average current deviations occur during battery loading.
Innovation Solution
A quadrupole device is introduced, comprising a charge transistor operating in a linear regime and a thermistor, which together regulate the charge current based on temperature. This device is designed to be cost-effective, robust, and easily integratable into battery management systems, ensuring better current regulation and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional regulation devices are used, then the battery can be charged, but the temperature increase of electrical components leads to load current variations beyond allowable values
Solution Approach 1:
The patent implements a feedback mechanism using a thermistor thermally coupled to the transistor to sense temperature changes and automatically adjust the gate voltage to compensate for thermal effects, maintaining stable current regulation despite temperature variations
Solution Approach 2:
The patent changes the operating parameters by introducing temperature-dependent resistance through the thermistor, which dynamically adjusts the transistor's gate voltage based on temperature, thereby compensating for thermal drift in the load current
2Productivity
If conventional regulation devices are used, then charging can proceed, but initial overcurrents occur during battery loading
Solution Approach 1:
The patent applies preliminary action by pre-biasing the transistor through the voltage divider network (R1, R2, R3) to establish appropriate initial operating conditions before full charging current flows, preventing dangerous inrush currents while enabling rapid charging
3Power
If conventional regulation devices are used, then charging circuitry is provided, but the average load current value is far less than desired target value
Solution Approach 1:
The patent implements self-service by designing a regulation circuit that automatically adjusts its own operating parameters through the thermistor feedback, eliminating the need for complex external control systems while achieving the desired average load current
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 proposed solution provides improved regulation and stability of the charge current, particularly in managing temperature-related increases, thereby preventing overcurrent issues and ensuring that the battery is loaded efficiently and safely.
Implementation Method 1
a thermistor, which are configured to regulate, in association, the charge current of the battery according to the temperature
Implementation Method 2
the heat generated by the transistor associated with a thermistor allows a self-regulation
Data Source
AI summary
The invention relates to a device to regulate a charge current for a battery, said device being a quadrupole configured to link a battery to a charging device, said device comprising at least a first transistor (M1), said charge transistor, and a thermistor (R1), which are configured to regulate, in association, the charge current of the battery according to the temperature.