Slave Device Hybrid Power Switching for Bus Communication
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Solution Overview
Problem
In communication systems, slave devices powered solely by local sources can fail to communicate if the power supply is interrupted, disrupting the entire network and cutting off downstream devices.
Innovation Solution
Implementing a hybrid power arrangement that allows slave devices to switch to power from the communication bus if the local power supply fails, ensuring continuous communication without triggering faults or performance flags, and enabling downstream devices to also draw power from the bus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If slave devices are powered solely by local power supplies, then device complexity is reduced, but reliability deteriorates when power supply is interrupted
Solution Approach 1:
The patent combines multiple power supply sources (local power supply and communication bus power supply) into a unified power arrangement. The slave device incorporates both a local power supply interface and a power extraction interface connected to the communication bus, allowing the device to merge power from both sources to ensure continuous operation even when one source fails.
Solution Approach 2:
The power supply arrangement is made dynamic through the ability of the slave device to switch between power sources. The device can dynamically extract power from the communication bus when local power is unavailable, and can dynamically adjust its power extraction based on bus conditions, transforming a static single-source power system into a flexible multi-source system.
2Reliability
If slave devices extract power from the communication bus, then reliability improves during local power failure, but device complexity increases due to additional power extraction circuitry
Solution Approach 1:
The communication bus serves multiple functions simultaneously: it carries communication signals and provides power extraction capability. The same bus infrastructure that enables data transmission also serves as a power source, eliminating the need for separate dedicated power extraction hardware and reducing overall system complexity despite the added reliability capability.
Solution Approach 2:
The slave device uses the existing communication bus infrastructure to provide its own power needs without requiring external power sources. By extracting power from the bus it already connects to for communication, the device serves its own power requirements using resources already available in the system.
3Reliability
If thick and heavy cable bundles are used for communication infrastructure, then communication reliability is maintained, but system weight and space requirements increase
Solution Approach 1:
The communication bus performs dual functions by simultaneously transmitting communication signals and providing power extraction capability. This eliminates the need for separate heavy power cables, as the same lightweight bus conductors carry both data and power, significantly reducing cable bundle weight and space requirements while maintaining communication reliability.
Data Source
AI summary
Disclosed herein are systems and techniques for adaptive use of multiple power supplies in a communication system. For example, in some embodiments, a slave device may include: an upstream transceiver to couple to an upstream link of a bus of a communication system; and circuitry to couple to the upstream link of the bus and to a local power supply, wherein the circuitry is to switch from providing the local power supply to power the slave device to providing bus power supplied by the upstream link of the bus to power the slave device.