Dual-Battery Wireless Charging Circuit for Longer Device Runtime
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Solution Overview
Problem
Portable electronic devices face limitations in battery usage time due to the inefficiency of existing charging methods, which require bulky AC adapters and fixed power supplies, and noncontact charging using electromagnetic coupling is restricted to specific locations and has limited battery life extension.
Innovation Solution
A wireless power charge and discharge system that uses a first battery charged by a fixed power supply and a second battery charged by electromagnetic waves, with alternating discharge and charge cycles, allowing the second battery to be charged during the first battery's discharge periods, and utilizing a charge switching circuit to manage power between the two batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If noncontact charging utilizing electromagnetic coupling is used, then charging can be performed without a battery charger, but charging is restricted to the periphery of the battery charger and requires a fixed power supply
Solution Approach 1:
The system divides the power supply function into two separate batteries: a first battery charged by a fixed power supply and a second battery charged by electromagnetic waves. This segmentation allows the device to operate in different charging modes (fixed location charging vs. mobile charging) without requiring the entire system to be constrained by a single charging method, thereby resolving the contradiction between charging convenience and location flexibility.
Solution Approach 2:
The system dynamically switches between the first battery and second battery based on the available charging conditions. When a fixed power supply is available, the first battery is charged; when moving or without fixed power access, the second battery is charged via electromagnetic waves. This dynamic adaptation allows the device to maintain optimal charging efficiency regardless of location, resolving the contradiction between ease of operation and adaptability.
2Productivity
If the AC adaptor is incorporated in the portable electronic device, then charging capability is improved, but the device size increases and portability is reduced
Solution Approach 1:
The system extracts the heavy AC adaptor from the portable device and replaces it with a compact second battery that can be charged via electromagnetic waves. This extraction eliminates the need for a bulky power supply unit in the device while maintaining charging capability, as the second battery can be recharged wirelessly when needed, thus resolving the contradiction between charging capability and device portability.
Solution Approach 2:
The system replaces the mechanical connection required for AC adaptor charging with wireless electromagnetic wave charging for the second battery. This substitution eliminates the need for physical plugs and large power supply units, significantly reducing device weight and size while preserving charging functionality, thereby resolving the contradiction between charging capability and portability.
3Duration of action of moving object
If the battery capacity is increased to extend hours of use, then usage time is improved, but the device weight and size increase
Solution Approach 1:
The system segments the total battery capacity into two separate batteries: a first battery for primary power supply and a second battery for supplemental power. This segmentation allows the device to achieve extended hours of use through coordinated operation of both batteries without requiring a single oversized battery that would increase device weight and size, thus resolving the contradiction between usage duration and portability.
Solution Approach 2:
The system employs periodic charging action where the second battery is charged via electromagnetic waves during periods when the device is stationary or near a charging source. This periodic charging extends the effective hours of use without requiring the second battery to be permanently large, as it is replenished periodically, thereby resolving the contradiction between extended usage time and device weight.
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 system extends battery usage time, reduces the need to carry AC adapters, and enables noncontact charging without a battery charger, allowing continuous operation of electronic devices even without a fixed power supply.
Implementation Method 1
a second battery charged by electromagnetic waves
Implementation Method 2
a charge switching circuit for switching between electric power from the fixed power supply and electric power from the first battery
Data Source
AI summary
An electric power charge and discharge system for an electronic device having a battery, by which the electronic device can be used for a long period of time. In a wireless communication device including a wireless driving portion including a first battery and a wireless charging portion including a second battery, the first battery is charged by electric power from a fixed power supply and the second battery is charged by using electromagnetic waves existing in an external space. Further, the first battery and the second battery are discharged alternately, and during a period in which the first battery is discharged, the second battery is charged.