Wireless Earphone Charging Circuit Dynamic Voltage Adjustment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wireless earphones experience low energy efficiency during charging due to a fixed voltage output from the charging case, resulting in inefficient energy transfer, with an energy efficiency of 60% when the earphone battery voltage is 3V, leading to significant energy loss.
Innovation Solution
A charging circuit and method that dynamically adjusts the output voltage of the charging case in real-time based on the voltage required by the earphone battery, ensuring the output voltage is greater than or equal to the required voltage, thereby improving energy efficiency by converting the voltage of the charging case battery into an output voltage that increases with the earphone battery voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a fixed voltage (e.g., 5V) is output by the charging case, then the charging process is simple to implement, but the energy efficiency is low (e.g., 60% when battery voltage is 3V)
Solution Approach 1:
The charging case implements dynamic voltage adjustment where the output voltage changes in real-time based on the battery's charging state. The voltage conversion unit dynamically converts the charging case battery voltage to match the required voltage at different charging stages, transforming a static fixed-voltage system into a dynamic adaptive system that optimizes energy efficiency throughout the charging process.
Solution Approach 2:
The system changes the voltage parameter dynamically during charging. The voltage conversion unit adjusts the output voltage according to the battery's current voltage level, transitioning from a constant parameter (fixed 5V) to a variable parameter that adapts to charging needs, thereby improving energy efficiency from 60% to over 97%.
2Productivity
If the output voltage is increased to improve charging speed, then the charging power increases, but the energy loss increases significantly
Solution Approach 1:
The system optimizes the voltage parameter throughout the charging process by adjusting it according to the battery's state of charge. Rather than maintaining a high fixed voltage that causes excessive loss, the voltage conversion unit dynamically adjusts the output voltage to match optimal charging requirements at each stage, achieving both fast charging and low energy loss.
Solution Approach 2:
The communication unit provides feedback about the battery's voltage and charging state to the voltage conversion unit. This feedback mechanism enables the system to adjust the output voltage in real-time based on actual charging conditions, ensuring optimal charging speed while minimizing energy loss through continuous monitoring and adjustment.
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
This approach enhances energy efficiency by adjusting the output voltage to match the earphone's requirements, achieving efficiencies of 97.3% and 97.5% when the battery voltage is 3.6V and 3.9V respectively, significantly reducing energy consumption and improving charging performance.
Implementation Method 1
a voltage conversion unit converting a voltage of the first battery into an output voltage according to the data and outputting the output voltage through a voltage output terminal
Data Source
AI summary
Techniques for wirelessly charging a portable device are described. Charging circuits are designed based on energy efficiency that a charging voltage increases when the voltage of a battery being charged increases. In the case of charging a wireless earphone, the voltage output from a charging case changes in real time in accordance with the voltage on the battery in the earphone so as to reduce the energy consumption and improve the energy efficiency.