Wireless Power Supply Apparatus for Uniform Battery Charging
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Solution Overview
Problem
In non-contact charging systems, secondary batteries attached to power receiving apparatuses exhibit varying remaining capacities, leading to unequal operable times when multiple devices are charged simultaneously, as the power supply apparatus cannot evenly distribute power among them.
Innovation Solution
A power supply apparatus with detection, division, acquisition, and communication units that identify and group power receiving devices, acquire their battery capacities, and transmit commands to instruct charging or stopping based on capacity variations, ensuring even charging by prioritizing devices with lower capacities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the power supply apparatus supplies electric power to multiple power receiving apparatuses simultaneously, then the charging speed and productivity are improved, but the remaining capacities of secondary batteries become uneven leading to unequal operable times
Solution Approach 1:
The power supply apparatus segments the charging process by dividing multiple power receiving apparatuses into different groups based on their remaining capacities. The control unit allocates power supply priorities to different groups, ensuring that apparatuses with lower remaining capacities receive power first. This segmentation resolves the contradiction by maintaining simultaneous charging (high productivity) while creating structured charge distribution that achieves uniform remaining capacities across all devices.
2Loss of time
If the power supply apparatus charges all power receiving apparatuses at the same time, then the total charging time is reduced, but the operable time periods of the power receiving apparatuses cannot be made equal
Solution Approach 1:
The control unit performs preliminary classification of power receiving apparatuses into groups based on their remaining capacities before initiating simultaneous charging. By pre-establishing charge priority levels for different groups, the system ensures that when multiple devices are charged at once, those with lower remaining capacities will reach full charge first and stop receiving power. This preliminary action enables simultaneous charging to complete in minimal time while guaranteeing uniform operable time periods across all apparatuses.
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 ensures that all power receiving apparatuses within the charging range have relatively even remaining capacities, thereby extending their operable times uniformly.
Implementation Method 1
a power supply apparatus supplies electric power to a power receiving apparatus such as a mobile phone or digital still camera, to which a secondary battery is attached, without any connection via connectors... by an induced electromotive force, which is generated on a secondary coil included in the power receiving apparatus due to a magnetic flux change generated by the power supply apparatus including a primary coil
Data Source
AI summary
If a plurality of power receiving apparatuses are in a predetermined range, a power supply apparatus selects a power receiving apparatus to be preferentially charged based on the remaining capacities of batteries of the respective power receiving apparatuses, and stops charging of the power receiving apparatuses other than the selected power receiving apparatus until the remaining capacity of the selected power receiving apparatus reaches a predetermined value.