Wearable Charging Case With Variable Voltage for Cooler Earbud Charging
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Solution Overview
Problem
Wireless earbuds face low charging efficiency due to the need for larger batteries and increased heat generation, which shortens their lifespan and user comfort, while maintaining a compact size.
Innovation Solution
A charging device with a buck-boost regulator and controller in the charging case, which provides a variable voltage output to the earbuds, optimizing charging efficiency by adjusting the voltage output based on the earbud battery status, eliminating the need for a linear charger within the earbuds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a linear charger IC is used to regulate voltage drop by inserting a resistive device, then the voltage can be kept stable, but the charging efficiency is low (70% or less) and extra heat is generated
Solution Approach 1:
The patent changes the voltage parameter from fixed 5V to variable voltage output. The DC-DC converter dynamically adjusts the output voltage based on the earbud battery's charging status, eliminating the need for resistive voltage regulation and significantly improving charging efficiency while maintaining stable voltage delivery.
Solution Approach 2:
The patent introduces a dynamic voltage regulation system where the DC-DC converter continuously adjusts its output voltage in response to battery status feedback. This dynamic approach replaces the static resistive regulation method, optimizing charging efficiency throughout the charging process while maintaining voltage stability.
2Device complexity
If a linear charger is used for voltage regulation, then the charging process is simple, but extra heat generation occurs and battery life is shortened
Solution Approach 1:
The patent replaces the mechanical/resistive voltage regulation method with an electronic DC-DC converter system. This substitution eliminates the resistive heating effect while maintaining voltage regulation capability, thereby reducing heat generation and extending battery life without significantly increasing circuit complexity.
3Quantity of substance
If a bigger battery is used in the charging case to compensate for low charging efficiency, then more energy can be stored, but the size of the charging case increases
Solution Approach 1:
The patent converts the harmful effect of low charging efficiency into a benefit by implementing DC-DC conversion technology. This converts the previously wasted energy into useful charging power, allowing the charging case to deliver more effective charging capacity without increasing battery size or case volume.
4Duration of action of moving object
If wireless earbuds are made with a relatively large battery to ensure sufficient usage time, then the usage duration is extended, but the size of the earbuds increases
Solution Approach 1:
The patent applies DC-DC conversion technology to convert the low charging efficiency problem into a solution. By improving charging efficiency, the system can rapidly recharge smaller earbud batteries, effectively extending usage duration without increasing earbud size, as the energy transfer becomes much more efficient.
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
Significantly improves charging efficiency, reducing heat generation and extending battery life while maintaining a compact earbud design.
Implementation Method 1
a DC-DC converter electrically connected to the power source, and adapted to receive input from the power source and provide a variable voltage output
Implementation Method 2
A linear charger IC in the earbuds receives the 5V voltage from the charging case, and regulates a voltage drop between the 5V voltage and a battery in the earbud by inserting a resistive device to keep load voltage stable
Implementation Method 3
the DC-DC converter is a buck-boost regulator adapted to provide a variable voltage output
Data Source
AI summary
A charging device for wearable device and a wearable device assembly are provided. The charging device comprises: a power source; a DC-DC converter electrically connected to the power source, and adapted to receive input from the power source and provide a voltage output; a controller that is in communication with the DC-DC converter; a linear charger electrically connected to the DC-DC converter and adapted to receive the voltage output from the DC-DC converter and provide a voltage output to charge a battery in the wearable device via a power connection between the charging device and the wearable device. The wearable device assembly comprises: a charging device; a wearable device comprising a battery, wherein the charging device is adapted to charge the battery of the wearable device via a power connection between the charging device and the wearable device.