Wireless Headphone Charging Base UART Link Over Three Contacts
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Solution Overview
Problem
Existing wireless headphones and bases with a three-wire design can only support single-wire half-duplex communication when the headphone is charged, limiting two-way communication capabilities due to the need for a power supply and ground loop, which conflicts with common chip UART interfaces.
Innovation Solution
Incorporating a wireless headphone and base design with transistors and resistors to separate TXD wires, forming an OC gate and using pull-up resistors to enable two-way communication without changing the number of contacts, allowing RXD and TXD wires to be bridged for serial communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If three-wire design is used for charging connection, then power supply and ground loop can be formed, but two-way communication cannot be implemented when headphone is charged
Solution Approach 1:
The patent implements dynamic role switching between master and slave devices. The master slave determination module dynamically changes the communication roles based on which device is charging, allowing the system to adapt its communication mode to the current charging state, thereby enabling two-way communication over the single data wire
Solution Approach 2:
The patent employs periodic role reversal where the master and slave devices switch roles at predetermined intervals or conditions. This periodic action allows both devices to take turns initiating communication, effectively achieving two-way communication capability within the constraints of the three-wire design
2Adaptability or versatility
If single-wire half-duplex communication is used, then power supply and ground can be provided, but common chip UART interfaces cannot support two-way communication
Solution Approach 1:
The patent segments the communication process into distinct phases: charging phase and communication phase. During the charging phase, power is transmitted; during the communication phase, data is transmitted. This segmentation allows the use of standard UART interfaces while maintaining reliable two-way communication by separating power and data transmission in time
Solution Approach 2:
The patent introduces a communication control module as an intermediary that manages the single data wire communication. This intermediary coordinates the communication between master and slave devices, handling protocol conversion and signal level matching, thereby enabling compatibility with common chip UART interfaces while maintaining communication stability
3Ease of operation
If TXD wires are directly connected for two-way communication, then communication can be established, but overload and damage will occur
Solution Approach 1:
The patent introduces level shifting circuits as intermediary components between the TXD wires of master and slave devices. These level shifters act as protective mediators that prevent direct connection of the TXD lines, thereby avoiding overload and potential damage while still enabling straightforward two-way communication setup
Solution Approach 2:
The patent implements protective circuits that are built into the communication interface before direct connection occurs. These circuits include current limiting and voltage clamping mechanisms that provide beforehand cushioning against potential overload conditions, preventing damage before it can occur
Data Source
AI summary
A wireless headphone system, a wireless headphone, and a base. The wireless headphone system includes the wireless headphone and the base. The base includes a base RXD wire, a base TXD wire, a base connection wire, and a base triode; and the wireless headphone includes a wireless headphone RXD wire, a wireless headphone TXD wire, a wireless headphone connection wire, and a wireless headphone transistor. The base RXD wire and the base TXD wire are connected together through the base transistor and led out through the base connection wire. The wireless headphone RXD wire and the wireless headphone TXD wire are connected together through the wireless headphone transistor and led out through the wireless headphone connection wire. When the wireless headphone is inserted into the base, the base connection wire and the wireless headphone connection wire are connected to realize two-way communication. According to embodiments of the present invention, when the headphone is charged on the base, two-way communication between the headphone and the base can still be implemented while maintaining the existing three-wire design.