RF Wireless Charging Circuit with Dynamic Power Control
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Solution Overview
Problem
The increasing demand for higher processing capabilities in mobile communication devices leads to more complex integrated circuits that consume more battery power, making it challenging to prolong battery life and requiring high-capacity, expensive batteries that often need recharging during the day.
Innovation Solution
A wireless charging circuit that harvests radio frequency (RF) power to charge lithium-ion batteries, dynamically adjusting the charging power based on a battery charging profile by sending a battery charging signal indication to the wireless charging station to either reduce or increase the effective charging power, ensuring fast charging while preventing overcharging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If high-capacity batteries are used to extend battery life, then the battery capacity increases, but the device size and cost increase
Solution Approach 1:
The system performs preliminary actions by harvesting RF power in advance and storing it in the battery before it is needed, enabling the device to operate for extended periods without physical recharging. The RF power harvesting circuit continuously captures ambient RF energy and converts it to charge the battery, proactively extending battery life without increasing device volume.
2Productivity
If fast charging is provided to the battery, then the charging speed increases, but the battery may suffer from overcharging damage
Solution Approach 1:
The wireless charging controller implements a feedback mechanism by continuously monitoring the battery charging status and dynamically adjusting the charging power. It compares the effective charging power against a target charging power determined according to a battery charging profile, and sends BCSI signals to the wireless charging station to increase or reduce charging power accordingly, enabling fast charging while preventing overcharging damage.
3Productivity
If the charging power is increased to provide fast charging, then the charging efficiency improves, but the battery may be damaged due to overcharging
Solution Approach 1:
The system dynamically adjusts the charging power based on real-time battery status and charging profile requirements. The wireless charging controller continuously monitors effective charging power and modifies the charging rate adaptively, sending BCSI signals to increase power when the battery can accept it and reduce power when approaching full charge, thereby maintaining high charging efficiency while preventing overcharging damage.
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 solution provides efficient and adaptive charging that extends battery life by dynamically adjusting the charging power, ensuring fast charging while protecting the battery from overcharging damage, thus addressing the limitations of traditional battery charging methods.
Implementation Method 1
an RF power harvesting circuit configured to receive a wireless RF charging signal from a wireless charging station and generate a direct-current (DC) charging signal to charge a battery
Data Source
AI summary
A wireless charging circuit is disclosed. In this regard, a wireless charging circuit is configured to charge a battery by harvesting radio frequency (RF) power from a wireless RF charging signal provided by a wireless charging station. The wireless charging circuit monitors an effective charging power provided to the battery and sends a battery charging signal indication (BCSI) to the wireless charging station to reduce the effective charging power if the effective charging power is greater than a target charging power. In another aspect, the wireless charging circuit sends the BCSI to increase the effective charging power if the effective charging power is less than the target charging power. By dynamically adjusting the effective charging power based on the charging profile of the battery, it is possible to provide fast charging to the battery while protecting the battery from overcharging damage.