Supply Current Modulation in Active Antennas Over Single Coax
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Solution Overview
Problem
Current motor vehicle communication systems face inefficiencies due to high transmission loss from vehicle sheet metal, requiring multiple antennas and additional communication paths, which increase complexity and cost, especially when handling high power dissipation components and needing separate communication paths for reporting information.
Innovation Solution
A current control circuit with a variable voltage source coupled with a current source and sink, allowing modulation of supply current into different values for reporting information without relying on the power supply voltage, enabling information transmission through the same cable used for supply voltage, thus eliminating the need for additional communication paths and reducing component size and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate communication paths are used for reporting information from compensators to TCU, then information can be reliably transmitted, but system complexity and cost increase
Solution Approach 1:
The patent combines the power supply function and communication function into a single coaxial cable system. The compensator modulates information onto the supply current itself, allowing both power delivery and data transmission through the same physical medium, thereby eliminating separate communication paths while maintaining reliable information transmission.
Solution Approach 2:
The supply current in the coaxial cable serves dual purposes: it provides both electrical power to the compensator and carries modulated information signals. This multi-functional use of the same current pathway reduces system complexity by eliminating dedicated communication cables while ensuring reliable bidirectional communication.
2Power
If high-power components are used to handle power dissipation in compensators, then sufficient power can be delivered, but component size and cost increase
Solution Approach 1:
The patent replaces traditional voltage-based power delivery with current-based power delivery and communication. By using a constant current source and modulating information onto the current rather than using separate voltage signals, the system achieves efficient power transfer with reduced power dissipation, allowing the use of smaller, lower-cost components.
Solution Approach 2:
The system transitions from voltage-based control to current-based control, where information is encoded in current modulation rather than voltage variation. This parameter change enables more efficient power utilization and reduces the power handling requirements of components, thereby reducing size and cost.
Data Source
AI summary
Exemplary embodiments are disclosed of current control circuits and methods of modulating supply current from a first device (e.g., a telematics control unit (TCU), etc.) to one or more second devices (e.g., one or more compensators, etc.). In an exemplary embodiment, a method includes modulating a supply current from a first device to a second device into different current values for reporting different information from the second device to the first device. An exemplary embodiment of a current control circuit includes a variable voltage source electrically coupled with a current source and a current sink. The current control circuit is configured to modulate the supply current from a first device to the second device into different current values for reporting different information from the second device to the first device.