Aviation Headset Power via Ground Conductor Differential
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Solution Overview
Problem
Aviation headsets face challenges in receiving electric power due to outdated interface standards that were not designed to supply power, leading to bulky and heavy control boxes for batteries, which are frequently replaced.
Innovation Solution
Creating a differential DC voltage potential between the ground conductor of a microphone and an acoustic driver in a headset, allowing electric power to be provided through the aircraft communications system interface without relying on local power sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If traditional aviation headset interfaces (GA or U-174) are used, then compatibility with existing aircraft communication systems is maintained, but the interface cannot provide sufficient electric power for modern headset functions
Solution Approach 1:
The patent makes existing aviation headset interfaces (GA and U-174) multi-functional by enabling them to provide both audio signal transmission and electric power delivery through the same conductors. The system creates a voltage differential between ground conductors to deliver power without requiring new interface standards, thus maintaining compatibility while adding power provision capability.
2Use of energy by moving object
If a Lemo interface with power conductor is used, then sufficient electric power can be provided to the headset, but the interface is not widely adopted and reduces compatibility
Solution Approach 1:
The patent introduces a voltage differential creation mechanism as an intermediary between the existing interface conductors and the power-hungry headset components. By creating a voltage difference between the microphone ground and acoustic driver ground conductors, the system enables power delivery through standard interfaces without requiring adoption of the Lemo interface.
3Reliability
If local power sources (batteries) are used in the headset, then functional independence is achieved, but the control box becomes bulky and heavy
Solution Approach 1:
The patent extracts the power source from the headset itself and relocates it to the aircraft communication system. By delivering power through the interface conductors from the aircraft's power system, the need for heavy batteries and power management circuitry in the headset is eliminated, significantly reducing the control box weight and complexity.
4Device complexity
If microphone bias voltage is used to power headset functions, then power delivery is simplified, but the current capacity is insufficient and causes signal distortion
Solution Approach 1:
The patent transitions from using a single-conductor bias voltage system to a two-conductor voltage differential system. By creating a voltage difference between two ground conductors (microphone ground and acoustic driver ground), the system increases available current capacity while maintaining simplicity in the power delivery mechanism.
Data Source
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AI summary
Electric power is provided to a two-way communications headset by creating a differential DC voltage potential between a ground conductor associated with a microphone of that headset and a ground conductor associated with an acoustic driver of that headset, thereby enabling that headset to refrain from drawing electric power from a more limited local power source.