Ring-Type Communication Device Impedance Matching for Disconnection Resilience
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Solution Overview
Problem
Existing communication devices using multi-drop bus configurations face challenges in maintaining signal integrity and power delivery when disconnections occur, particularly in critical applications like automotive systems, where high reliability is essential and the risk of wiring disconnection increases with reduced wiring numbers.
Innovation Solution
A communication device with a ring-type transmission line where the master station transmits signals and power from both ends, and slave stations have impedance variable elements that adjust their input impedance based on connection position, preventing open-end states and signal waveform deterioration during disconnections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a ring-type transmission line is used to prevent disconnection failures, then reliability is improved, but signal waveform deterioration occurs due to open-end states when disconnection happens
Solution Approach 1:
The patent applies preliminary action by pre-setting impedance variable elements at each slave station to specific impedance values before disconnection occurs. When disconnection happens, these pre-configured impedance elements immediately prevent open-end states without requiring real-time detection or adjustment, thus maintaining signal waveform quality while providing redundancy against disconnection failures.
Solution Approach 2:
The patent utilizes parameter changes by dynamically adjusting the impedance values of impedance variable elements based on the connection position of slave stations in the ring-type transmission line. Each slave station is assigned a specific impedance value corresponding to its position, which prevents signal waveform deterioration caused by reflections at disconnection points while maintaining the reliability benefits of the ring configuration.
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
This configuration ensures continuous communication and power delivery to slave stations even during disconnections, maintaining signal quality and reliability by dynamically setting impedance to match the ring-type transmission line, thus reducing the impact of disconnections on the communication waveform.
Implementation Method 1
each of the slave stations includes an impedance variable element, and the impedance variable elements are connected to the ring-type transmission line in parallel... dynamically setting impedance to match the ring-type transmission line
Data Source
AI summary
A communication device includes a master station, a ring-type transmission line whose start point and end point are connected to the master station, and a plurality of slave stations connected to the ring-type transmission line in parallel. The master station transmits a signal and feeds electric power from both of the start point and the end point of the ring-type transmission line. Each of the slave stations includes an impedance variable element connected to the ring-type transmission line in parallel, and values are set to the impedance variable elements in accordance with the connection positions of the slave stations.