Wireless Charging Circuit for Button Cell Batteries
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Solution Overview
Problem
Existing wireless charging solutions are inadequate for small form factor batteries, such as button/coin cell rechargeable lithium ion batteries used in portable electronic devices, as they fail to provide efficient and reliable charging due to size mismatches and lack of protection against overcharge, over-discharge, and short-circuits.
Innovation Solution
A wireless charging device comprising a receiving inductor coil, a wireless charging receiving circuit, a charging control circuit, a voltage regulation circuit, and a battery protection circuit, which includes a constant voltage output regulator and protection mechanisms like overcharge detection and resettable fuses, allowing for flexible coil configurations and size compatibility with commercial transmitting coils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing wireless charging solutions are used for button cell batteries, then charging functionality is provided, but charging efficiency is insufficient and reliability is poor due to size mismatches and lack of protection mechanisms
Solution Approach 1:
The patent changes the electrical parameters of the charging circuit by implementing a voltage regulation circuit that converts the rectified voltage to a stable charging voltage suitable for button cell batteries. This parameter adjustment enables reliable charging of small form factor batteries that are incompatible with existing wireless charging solutions
Solution Approach 2:
The patent introduces an intermediary charging circuit between the wireless power reception and the button cell battery. This intermediary circuit includes voltage regulation and protection mechanisms that mediate the power transfer, ensuring reliable and safe charging while adapting to the specific requirements of small form factor batteries
2Reliability
If standard wireless charging circuits are used, then power transfer is achieved, but voltage stability is poor and protection against faults is insufficient
Solution Approach 1:
The patent merges multiple protection functions (overcharge protection, over-discharge protection, short-circuit protection) into a single integrated charging control circuit. This combination approach provides comprehensive protection against faults while minimizing the increase in device complexity by consolidating multiple safety mechanisms into one unified circuit design
Solution Approach 2:
The patent implements feedback mechanisms through the charging control circuit that continuously monitors battery status and adjusts charging parameters accordingly. This feedback system provides protection against overcharge, over-discharge, and short-circuits by detecting abnormal conditions and responding appropriately, thereby enhancing reliability without requiring excessively complex circuitry
3Stability of the object's composition
If voltage regulation is not implemented, then circuit simplicity is maintained, but voltage stability deteriorates under varying load conditions
Solution Approach 1:
The patent changes the voltage parameter through the voltage regulation circuit, which converts the rectified voltage to a stable charging voltage. This parameter transformation ensures voltage stability under varying load conditions by actively regulating the output voltage, accepting the necessary circuit complexity as a trade-off for achieving stable voltage delivery to the button cell battery
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 solution enables efficient charging of button/coin cell batteries with stable voltage regulation and protection against faults, extending battery life and ensuring compatibility with various device form factors, including flexible and wearable electronics.
Implementation Method 1
A receiving inductor coil receives energy from a transmitting inductor coil
Data Source
AI summary
The present invention provides a charging device for a button/coin cell rechargeable lithium ion battery. A receiving inductor coil receives energy from a transmitting inductor coil which is passed to a wireless charging receiving circuit which is in electrical communication with the receiving inductor coil. The wireless charging receiving circuit communicates with a charging control circuit, a voltage regulation circuit, and a battery protection circuit in electrical communication with one another. The voltage regulation circuit includes a 1.8 V to 3.3 V constant voltage output regulator circuit to maintain a constant voltage output in loading currents ranging from approximately 10 μA to approximately 300 mA.