Audio Accessory Power Management via Dynamic Switching
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Solution Overview
Problem
Audio jack accessories, such as headsets with active noise cancellation (ANC) features, require additional power which is not efficiently managed by current mobile devices, leading to larger battery sizes and higher costs, and existing authentication systems fail to ensure vendor-known quality and full system features before enabling communication.
Innovation Solution
An advanced slave circuit and method that uses a load switch to provide power to a battery and isolate it when not in use, and a microphone switch to selectively couple the microphone to the master device, allowing for bi-directional communication and power management through the audio jack, including charging and ANC functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If power is provided continuously to the battery through the audio jack, then the battery can be charged and ANC circuit can be powered, but the accessory cannot selectively couple the microphone to the master device during voice mode
Solution Approach 1:
The patent implements dynamic switching between audio mode and voice mode using mode-indicating signals exchanged between master and slave devices. The load switch and microphone switch states are dynamically adjusted based on the current mode, allowing the accessory to adapt its power management and microphone coupling behavior according to operational requirements.
Solution Approach 2:
The slave device autonomously controls its own power management and microphone coupling based on received mode-indicating signals from the master device. The advanced slave circuit self-regulates the load switch and microphone switch states without requiring direct master device control, enabling the accessory to serve itself in managing its operational modes.
2Use of energy by moving object
If the load switch is in the first state to provide power to the battery, then charging and ANC functionality are enabled, but the microphone cannot be coupled to the master device for communication
Solution Approach 1:
The patent dynamically transitions the load switch between first and second states based on operational mode. During audio mode, the load switch is in the first state to provide power for charging and ANC. During voice mode, the load switch transitions to the second state to enable microphone coupling, allowing the system to adapt power delivery and communication capabilities according to current operational requirements.
Solution Approach 2:
The system periodically switches between power delivery mode and communication mode through sequential state changes of the load switch and microphone switch. This periodic action between different operational states enables the accessory to alternate between charging/ANC functionality and microphone communication as needed.
3Ease of operation
If the microphone switch couples the microphone to the master device, then voice communication is enabled, but power cannot be transferred to the battery for charging or ANC power
Solution Approach 1:
The patent implements dynamic control where the microphone switch and load switch are coordinated based on operational mode. When the microphone switch is in the first state to enable voice communication, the load switch is simultaneously in the second state to prevent power delivery. This dynamic coordination ensures that communication and power delivery functions are mutually exclusive as required by the audio jack's electrical characteristics.
Solution Approach 2:
The advanced slave circuit acts as an intermediary that manages the conflicting requirements of power delivery and microphone coupling. It receives mode-indicating signals from the master device and autonomously coordinates the states of both the load switch and microphone switch to resolve the contradiction between power delivery and communication capabilities.
4Ease of operation
If authentication is not performed, then the accessory can be used immediately, but vendor-known quality and full system features cannot be ensured
Solution Approach 1:
The patent performs authentication and device identification as a preliminary action before enabling full accessory functionality. The master device exchanges identification signals with the slave device through the audio jack to verify accessory authenticity and capabilities. This preliminary authentication ensures vendor-known quality and enables full system features including ANC and voice communication only after verification succeeds.
Data Source
AI summary
This document discusses, among other things, an advanced slave circuit and method configured to transfer power from a master device to a battery through an advanced slave circuit in a first mode using a load switch in a first state, to isolate the battery from the master device using the load switch in a second state, and to selectively couple a microphone to the master device using the advanced slave circuit in a second mode using a microphone switch.