Galvanically Isolated Bus Transceiver With Differential Signal Balancing
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Solution Overview
Problem
Transceivers operating in different voltage domains experience signal distortion due to galvanic isolation, leading to discrepancies in the duration of positive and negative differential voltages, which affects communication reliability.
Innovation Solution
A signal balance module within the transceiver adjusts the duration of positive and negative differential voltages by determining and equalizing the duration difference between these signals, using a controller to modify control signals or directly controlling the transmitter to ensure balanced symbol durations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If galvanic isolation is used between nodes operating in different voltage domains, then voltage domain compatibility is improved, but signal distortion occurs due to duration discrepancies in differential voltages
Solution Approach 1:
The transceiver measures the actual duration of positive and negative differential voltages received from the other node, compares these durations, and uses the comparison result to adjust subsequent symbol transmission. This closed-loop feedback mechanism compensates for the signal distortion caused by galvanic isolation, maintaining communication reliability while preserving voltage domain compatibility
Solution Approach 2:
The transceiver dynamically adjusts transmission parameters (symbol duration, differential voltage timing) based on measured reception characteristics. By changing these parameters adaptively, the system compensates for distortion introduced by galvanic isolation, resolving the contradiction between maintaining voltage domain compatibility and ensuring communication reliability
2Reliability
If signal duration balancing is implemented to reduce distortion, then communication reliability is improved, but device complexity increases due to additional measurement and control mechanisms
Solution Approach 1:
The signal balance module is integrated within the existing transceiver structure, combining measurement, comparison, and adjustment functions into the unified transceiver device. This merging approach improves communication reliability through active signal balancing while minimizing the increase in overall device complexity by reusing existing structural elements
Solution Approach 2:
The transceiver performs self-diagnosis and self-adjustment by measuring its own transmitted signals' reception characteristics and automatically modifying its transmission parameters accordingly. This self-service capability improves reliability without requiring external complex control systems, thereby limiting the increase in device complexity
Data Source
AI summary
A transceiver comprising:a transmitter configured to transmit a signal comprising differential voltages to at least a first terminal and a second terminal;at least one receiver;a controller configured to provide control signals to the transmitter to cause the transmitter to transmit symbols, wherein each symbol comprises a predefined set of said differential voltages including at least a positive differential voltage and a negative differential voltage; anda signal balance module configured, for one or more symbols, to:determine a first duration of the positive differential voltage of said one or more symbols;determine a second duration of the negative differential voltage of said one or more symbols;based on determination of a difference between the first and second durations, provide for control of the controller or control of the transmitter to reduce the difference between the first and second durations in a further symbol relative to the one or more symbols.