Battery Protection IC Reference Voltage Control
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Solution Overview
Problem
Conventional battery protection systems face challenges in accurately detecting overcurrent conditions due to variations in supply voltage and temperature, leading to potential battery damage and safety issues, as the ability to detect overcurrents is influenced by the battery's own variables such as charging level, supply voltage, and temperature.
Innovation Solution
A programmable battery protection system incorporating a reference voltage circuit, a variable resistor circuit with an array of fuses, and an overcurrent detection circuit that uses a reference voltage generated by the circuit to disconnect FETs from the battery, with a temperature variation correction circuit to ensure the current sense signal varies linearly with supply voltage and temperature changes, thereby maintaining invariant overcurrent signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional battery protection systems use fixed reference voltage for overcurrent detection, then the circuit structure is simple, but the overcurrent detection accuracy deteriorates due to supply voltage and temperature variations
Solution Approach 1:
The patent implements a dynamic reference voltage generation system that automatically adjusts the reference voltage based on supply voltage levels and temperature conditions. The reference voltage circuit includes voltage detection circuits and temperature compensation circuits that continuously monitor operating conditions and adjust the reference voltage accordingly, transforming the static reference voltage into a dynamic one that adapts to changing conditions, thereby resolving the contradiction between detection accuracy and circuit complexity
Solution Approach 2:
The patent changes the reference voltage parameter dynamically based on supply voltage and temperature variations. By using detection circuits to monitor supply voltage levels and temperature, the system adjusts the reference voltage parameter to maintain accurate overcurrent detection thresholds under different operating conditions, directly addressing the measurement precision issue while managing circuit complexity through parameter adaptation
2Reliability
If the current sense signal does not vary linearly with supply voltage, then the circuit design is simpler, but the overcurrent detection reliability deteriorates under varying supply voltage conditions
Solution Approach 1:
The patent implements feedback mechanisms where detection circuits continuously monitor the supply voltage and temperature conditions, and this information is fed back to adjust the reference voltage generation. The feedback loop ensures that the current sense signal maintains a linear relationship with supply voltage variations, improving detection reliability while managing circuit complexity through intelligent feedback control
Solution Approach 2:
The patent introduces intermediary circuits including voltage detection circuits and temperature compensation circuits that act as mediators between the supply voltage/temperature variations and the reference voltage generation. These intermediary circuits process the input variations and transform them into linearized output signals, resolving the contradiction between reliability and circuit complexity by adding controlled intermediate processing stages
3Measurement precision
If temperature variations are not compensated, then the circuit is simpler, but the overcurrent detection precision deteriorates due to temperature-dependent component characteristics
Solution Approach 1:
The patent implements temperature compensation by dynamically adjusting the reference voltage parameter based on detected temperature conditions. The temperature compensation circuit monitors temperature variations and modifies the reference voltage to compensate for temperature-dependent changes in component characteristics, maintaining detection precision while managing circuit complexity through parameter adaptation
Solution Approach 2:
The patent applies temperature compensation specifically to the reference voltage generation portion of the circuit where it is most needed for accurate overcurrent detection. By localizing the temperature compensation function to the critical reference voltage generation area rather than the entire circuit, the patent improves detection precision while minimizing the overall circuit complexity increase
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 effectively linearizes the current sense signal with respect to supply voltage changes and makes overcurrent detection invariant to supply voltage variations, reducing the likelihood of battery damage and enhancing safety by dynamically adjusting the reference voltage based on actual conditions.
Implementation Method 1
a bandgap buffer circuit, and an amplifier operatively coupled together
Data Source
AI summary
A programmable battery protection system. Implementations may include: a battery and a battery protection integrated circuit (IC) coupled with the battery that includes a reference voltage circuit, a variable resistor circuit coupled with the reference voltage circuit, and only two field effect transistors (FETs) coupled with the overcurrent detection circuit and with the battery. The reference voltage circuit and the variable resistor circuit may be configured to cause a current sense signal of the system to vary substantially linearly with changes in a supply voltage of the system.