Multi-level Encoding for Battery Management System EMI Reduction
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Solution Overview
Problem
Battery management systems in electric vehicles face challenges with reliable and high-speed data transmission between battery cell controllers due to growing data volumes and susceptibility to electromagnetic interference (EMI) in conductive wiring.
Innovation Solution
A battery management system employing a multi-level encoding technique using a logic circuit to encode data as a serial data stream over three discrete signal levels, with a transceiver discarding combinations that reduce EMI, and a driver circuit converting serial data into pulse bit data for transmission through a galvanically isolated line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If multi-level encoding technique is used to increase data transmission speed, then data communication speed is improved, but electromagnetic interference (EMI) on the transmission line increases
Solution Approach 1:
The patent applies parameter changes by using multi-level encoding (changing from traditional binary to ternary or higher-level signal representations) to increase data transmission speed. Simultaneously, it modifies the signal level parameters to reduce EMI by carefully selecting which signal level combinations to transmit, effectively changing the electrical characteristics of the transmission to balance speed and interference reduction.
2Productivity
If more data units are encoded into each symbol to increase transmission efficiency, then data communication speed is improved, but the complexity of the encoding/decoding circuit increases
Solution Approach 1:
The patent applies segmentation by dividing the data stream into manageable units (such as 5-bit words) that can be encoded into symbols with a fixed number of signal level combinations (e.g., 32 combinations). This segmentation approach allows the encoding/decoding circuit to process data in discrete, standardized blocks, improving transmission efficiency while keeping the circuit complexity manageable through regular, repeatable processing units.
Data Source
AI summary
A battery management system comprises a first and second battery cell controllers and a transmission line providing a point-to-point signal transmission path between the first and second battery cell controllers. At least one of the first and second battery cell controllers includes a logic circuit constructed and arranged for encoding data for transmission as a serial data stream along the signal transmission path in compliance with a multi-level encoding technique. The logic circuit comprises an encoding/decoding circuit that generates a modulated signal of the serial data stream over at least three discrete signal levels at a predetermined and fixed data pulse frequency for transmission through the transmission line and encodes a plurality of data units of the serial data stream into a data packet. The data packet includes at least three symbols constructed and arranged with at least four consecutive transmissions per symbol. Each transmission of each symbol assumes one of the three discrete signal levels. At least one transceiver is configured in a transmit mode or a receive mode and that discards any combinations of the maximum number of possible combinations to reduce a source of electromagnetic interference (EMI) on the transmission line.