Optical CAN Bus Arbiter for Bidirectional Wireless Charging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wired controller area network (CAN) buses are inadequate for facilitating bidirectional wireless communication between independent CAN buses, as they cannot prevent simultaneous transmission across optical link ends, leading to potential bus conflicts.
Innovation Solution
An arbiter apparatus is interposed between the optical link ends of the CAN buses to arbitrate transmit and receive processes, delaying subsequent communications until prior communications have concluded, thereby preventing simultaneous transmission and ensuring bidirectional wireless optical communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If bidirectional wireless optical communication is enabled between independent CAN buses, then communication capability is improved, but bus conflicts occur due to simultaneous transmission
Solution Approach 1:
The patent introduces an arbiter apparatus as an intermediary component positioned between two independent CAN buses. This arbiter monitors and controls transmission requests from both buses, granting access to the optical link sequentially. The arbiter acts as a mediator that prevents simultaneous transmission by allowing only one bus to transmit at a time, thus eliminating bus conflicts while maintaining bidirectional communication capability.
2Productivity
If simultaneous transmission is allowed on both CAN buses, then communication efficiency is improved, but signal interference and data loss occur
Solution Approach 1:
The arbiter apparatus performs preliminary actions by pre-evaluating transmission requests from both CAN buses before actual data transmission occurs. It grants transmission rights to one bus while blocking the other, ensuring that only one bus transmits at a time. This preliminary control mechanism prevents signal interference and data loss that would result from simultaneous transmission, while maintaining efficient communication through minimized waiting periods.
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 solution effectively facilitates bidirectional wireless optical communication between independent CAN buses, preventing bus conflicts and enabling efficient communication for applications such as battery management and charging, with potential data exchange rates of up to 250 kilobytes-per-second over a 20 millimeter air gap.
Implementation Method 1
bidirectional wireless optical communication across the first and second optical link ends
Data Source
AI summary
An apparatus and method arbitrates bidirectional optical communication across optical link ends of independent controller area network buses. A mobile device has a battery management system and a first controller area network bus having a first optical link end, and a charging station has a second controller area network bus having a second optical link end. When the mobile device aligns with the charging station for charging, the optical links ends align to allow communication between the battery management system and the charging station regarding charging the battery. The arbiter apparatus is operationally interposed between the optical link ends and arbitrates the bidirectional communication by delaying a subsequent communication from one of the battery management system and the charging station until a dominant bit of a prior communication is released, thereby preventing the controller area network buses from transmitting simultaneously across the optical link ends.