Wireless Headset Coil for Contactless Charging
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Solution Overview
Problem
Conventional wireless headsets face issues with connector wear-out from repeated charging, poor audio quality due to Bluetooth usage, and battery power depletion during use, with limited space for wireless charging antennas.
Innovation Solution
A wireless headset design incorporating a sound transducer coil that functions as both a speaker and a wireless power receiver, utilizing a magnetic flux path with radially-magnetized permanent magnets and a non-conductive structure to receive wireless power and operate at frequencies that minimize interference, allowing simultaneous audio transmission and power charging without the need for large antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional USB charging connectors are used, then charging can be accomplished, but connector wear-out occurs from repeated plugging and unplugging
Solution Approach 1:
The patent replaces the mechanical USB connector system with a wireless electromagnetic induction charging system. The sound transducer coil serves dual functions: audio transduction and wireless power reception, eliminating mechanical connectors entirely and resolving the wear-out issue through contactless energy transfer
2Ease of operation
If Bluetooth is used for audio transmission, then wireless audio link is provided, but audio quality degrades
Solution Approach 1:
The sound transducer coil performs multiple functions simultaneously: it acts as both the audio transducer for sound reproduction and the wireless power receiving antenna for electromagnetic induction charging. This multi-functionality eliminates the need for separate components and enables high-quality audio transmission without compromising charging capability
3Ease of operation
If 2.4 GHz radio frequency is used for Bluetooth transmission, then wireless communication is achieved, but performance degrades when transmitter and receiver are on opposite sides of a person
Solution Approach 1:
The patent changes the operating frequency parameter from 2.4 GHz Bluetooth to electromagnetic induction frequencies, and changes the transmission medium from radio waves through air to magnetic flux through ferrite material. This parameter change eliminates signal degradation caused by human body water absorption and improves reliability
4Ease of operation
If conventional wireless charging antennas are added, then wireless charging capability is provided, but the small available area of headsets is exceeded
Solution Approach 1:
The sound transducer coil serves dual purposes: it functions as the audio transducer for sound reproduction and simultaneously as the wireless power receiving antenna for electromagnetic induction charging. This multi-functional design provides wireless charging capability without requiring additional antenna space, as the existing coil structure performs both functions
Solution Approach 2:
The patent merges the audio transducer function and wireless power reception function into a single sound transducer coil assembly. By combining these functions in one component, the design eliminates the need for separate antennas and fits within the limited headset area
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
The headset avoids connector wear-out, maintains power during use, and operates effectively without performance degradation due to user proximity or external interference, providing high-quality audio and efficient power management.
Implementation Method 1
a sound transducer coil configured to convert a first electrical signal to a first sound signal and/or to convert a first sound signal to a first electrical signal
Implementation Method 2
the wireless power receiver receives wireless power through the antenna via the sound transducer coil
Implementation Method 3
a ferrite material that is configured to saturate due to flux created by the permanent magnet
Data Source
AI summary
A wireless headset comprising a sound transducer, said sound transducer and a wireless power receiver. The sound transducer comprises a sound transducer coil configured to at least one of convert a first electrical signal to a first sound signal and convert a first sound signal to a first electrical signal comprising first audio information. The wireless power receiver is configured to receive wireless power through an antenna comprising said sound transducer coil.