Signal Processing Device for Battery Communication Noise Reduction
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Solution Overview
Problem
Battery management systems in electric and hybrid vehicles face signal attenuation and noise interference issues due to the use of power lines for communication, leading to potential overload of analog-to-digital converters and reduced signal-to-quantization noise ratio.
Innovation Solution
A signal processing device that detects interference signals from narrowband noise, generates an approximation signal to reproduce the interference, and produces a difference signal by subtracting the approximation from the transmission signal, thereby reducing noise levels and enhancing the signal-to-quantization noise ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If power lines are used for communication to reduce weight and production costs, then manufacturing cost is reduced, but signal attenuation and noise interference increase
Solution Approach 1:
The invention extracts and removes the interference signal from the transmission signal using signal processing techniques. The interference detection unit identifies narrowband interference components, and the interference removal unit subtracts these components from the received signal, thereby separating the useful communication signal from the harmful interference on the power line carrier
Solution Approach 2:
The invention introduces an intermediary signal processing chain between the power line communication interface and the analog-to-digital converter. This intermediary processing includes interference detection, approximation signal generation, and interference removal units that act as mediators to clean the signal before it reaches the ADC, preventing overload while maintaining the cost-effective power line carrier
2Adaptability or versatility
If automatic gain control is used to handle amplitude variations, then adaptability is improved, but interference signal amplification occurs leading to ADC overload
Solution Approach 1:
The invention performs preliminary interference removal before the signal enters the automatic gain control and ADC stages. By detecting and removing narrowband interference components in advance, the system prevents interference amplification that would otherwise occur during subsequent gain adjustment, thereby avoiding ADC overload while maintaining signal adaptability
Solution Approach 2:
The interference removal unit extracts and eliminates the harmful interference components from the transmission signal before further processing. This extraction prevents the interference signal from being amplified by the automatic gain control and reaching the ADC at overload levels
3Device complexity
If power lines are used as communication medium, then device complexity is reduced, but noise interference from narrowband sources increases
Solution Approach 1:
The invention implements a feedback mechanism where the received signal is continuously monitored for narrowband interference components. The interference detection unit identifies interference frequencies, generates approximation signals, and feeds back corrected signals to the interference removal unit, creating a closed-loop system that actively compensates for narrowband interference on the simple power line carrier
Data Source
AI summary
A signal processing device is usable in a communication system and includes a signal path, a signal detector, a signal synthesizer, a transmission unit, and a receive path including an analog-to-digital converter. The signal path transmits a transmission signal that was transmitted by the communication system and that contains a communication signal. The signal detector detects, and generates an activation signal in response to, an interference signal contained in the transmission signal and occurring due to narrowband interferences. The signal synthesizer generates an approximation signal for the interference signal upon the presence of the activation signal. The transmission unit receives the transmission signal transmitted by the signal path and the approximation signal, and outputs a difference signal between the transmission signal and the approximation signal. The analog-to-digital converter converts a signal generated based on the difference signal into a digital signal.