Battery Balancing Circuit Parasitic Resistance Compensation
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Solution Overview
Problem
Battery balancing systems face performance decline due to changes in resonant frequency and parasitic resistance, leading to inaccurate voltage measurements and potential system damage.
Innovation Solution
A battery balancing system utilizing a phase-locked loop (PLL) controller to adjust the drive frequency and account for parasitic resistances, ensuring optimal performance by matching the resonant frequency and correcting measured voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a constant drive frequency is used in battery balancing circuits, then the circuit operation is simple and stable, but the resonant frequency mismatch due to aging and environmental changes causes performance degradation
Solution Approach 1:
The patent implements a phase-locked loop (PLL) controller that dynamically adjusts the drive frequency to track the resonant frequency of the battery balancing circuit. The PLL continuously monitors the circuit's resonant frequency and automatically tunes the drive frequency to match, ensuring optimal performance despite aging, temperature changes, or component variations. This dynamic adaptation resolves the contradiction by making the system flexible rather than fixed.
2Measurement precision
If parasitic resistance is present in the battery monitoring circuit, then the circuit can be implemented with standard components, but the voltage measurements become inaccurate leading to incorrect control execution
Solution Approach 1:
The patent employs a feedback mechanism where the measured cell voltage is used to compensate for the voltage drop across parasitic resistance. The system measures the current flowing through the monitoring circuit and calculates the voltage drop caused by parasitic resistance, then adds this compensation to the measured voltage to obtain the accurate cell voltage. This feedback-based compensation resolves the measurement accuracy issue without requiring special low-resistance components.
3Duration of action of stationary object
If the resonant frequency of the battery balancing circuit changes due to aging and environmental factors, then the circuit components are durable and simple, but the drive frequency no longer matches causing performance decline
Solution Approach 1:
The patent implements a self-tuning capability where the battery balancing circuit automatically adjusts its own drive frequency to match its resonant frequency. The phase-locked loop controller continuously monitors the circuit's response and self-adjusts the driving frequency without external intervention. This self-service mechanism ensures that the circuit maintains optimal performance throughout its operational lifespan despite aging or environmental changes.
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 system maintains optimal battery balancing performance by dynamically adjusting to changes in resonant frequency and parasitic resistances, ensuring accurate voltage measurements and preventing system damage.
Implementation Method 1
the resonant frequency of the circuit no longer matches the original frequency as the circuit is used
Implementation Method 2
parasitic resistance that adversely affects the accuracy of cell voltages monitored by a microprocessor
Data Source
AI summary
A system for balancing charge between a plurality of storage battery cells within a storage battery. The battery balancing system may sense changes, possibly caused by environmental influences, in the overall resonant frequency of charge balancing circuits contained within the battery balancing system and compensate for the change in resonant frequency. Further, the system may correct battery cell voltages monitored by a controller that may include errors due to intrinsic circuit problems, such as parasitic voltage, to reflect an actual voltage of a battery cell.