Wireless Power Feeding Unit with Dynamic Charge Control
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Solution Overview
Problem
Existing noncontact power feeding systems lack efficient control mechanisms to suspend and restart electricity transmission operations based on battery charge completion, leading to reduced user convenience and potential battery discharge.
Innovation Solution
A power feeding system and unit that utilize a magnetic or electric field for electricity transmission, featuring an electricity transmission control section that suspends transmission when the battery is fully charged and restarts when a predetermined condition is met, such as a decrease in battery voltage or user activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electricity transmission operation is continuously performed after battery charge completion, then battery overcharging and safety issues occur, but user convenience deteriorates due to inability to quickly resume charging when needed
Solution Approach 1:
The system dynamically adjusts the electricity transmission operation state based on real-time battery charge status and predetermined conditions. The control section transitions the system between suspended and active states, making the charging process adaptable to user needs while maintaining safety through automatic suspension when charge is complete.
Solution Approach 2:
The control section continuously monitors battery charge status and uses this feedback to control the electricity transmission operation. When charge completion is detected, the system automatically suspends transmission, and when predetermined conditions are met, it resumes transmission, creating a closed-loop control system that balances safety and convenience.
2Reliability
If electricity transmission operation is immediately suspended when battery charge is completed, then battery overcharging is prevented, but opportunity for quick recharge when user needs power is lost
Solution Approach 1:
The system performs preliminary suspension of electricity transmission operation when battery charge is detected as complete, preparing the system for potential quick resumption. The control section maintains the capability to restart transmission immediately when predetermined conditions are satisfied, reducing the time loss for resuming charging while preventing overcharging.
3Ease of operation
If control mechanism for suspending and restarting electricity transmission is implemented, then user convenience and battery management are improved, but system complexity increases
Solution Approach 1:
The control section performs multiple functions: monitoring battery charge status, determining charge completion, suspending electricity transmission operation, and restarting transmission when predetermined conditions are met. By consolidating these control functions into a single control section, the system achieves improved charging management without proportionally increasing overall system complexity.
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 ensures continued opportunity for battery recharge after full charge, enhancing user convenience by automatically restarting electricity transmission when necessary, thus maintaining battery power and usability.
Implementation Method 1
An electromagnetic induction method is well known as a method of performing power supply in such a noncontact manner
Implementation Method 2
attention is further focused on a noncontact power feeding system adopting a method referred to as magnetic resonance method using an electromagnetic resonant phenomenon
Data Source
AI summary
A power feeding unit includes an electricity transmission section configured to perform electricity transmission using one of a magnetic field and an electric field to a power-feeding objective unit having a secondary battery, and an electricity transmission control section configured to control electricity transmission operation of the electricity transmission section. The electricity transmission control section allows the electricity transmission operation to be suspended when charge of the secondary battery is completed based on power provided through the electricity transmission, and allows the electricity transmission operation to be restarted when a predetermined condition is satisfied after completion of the charge.