Wireless Charging Power Control via Adaptive Feedback
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Solution Overview
Problem
Existing battery charging systems using wireless power transmission of a magnetic resonance scheme lack adaptive control over transmit power based on the charge state of the battery, leading to inefficiencies in power management and potential overcharging.
Innovation Solution
A method and system that adaptively control transmit power by receiving messages related to the charge state, including extra power and charge power values, to maintain a constant extra power value in proportion to the charge power value, and suspend transmission when the battery reaches full charge, using a transmission apparatus and a reception apparatus with RF power signal generation and communication blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If constant current or constant voltage charging scheme is used, then charging simplicity is maintained, but power transmission efficiency deteriorates due to lack of adaptive control
Solution Approach 1:
The patent applies dynamics by transitioning from static constant current/voltage charging to dynamic adaptive power control. The transmission apparatus continuously receives charge state information messages from the reception apparatus and adjusts transmit power in real-time based on battery charge level, achieving both operational simplicity and high efficiency through automated adaptive adjustment.
Solution Approach 2:
The patent implements feedback control by having the reception apparatus continuously measure battery charge state and transmit this information back to the transmission apparatus. The transmission apparatus uses this feedback to adaptively adjust transmit power, ensuring optimal charging efficiency while maintaining simple operation through automated closed-loop control.
2Device complexity
If fixed transmit power is applied, then device complexity is reduced, but charging precision deteriorates leading to overcharging risks
Solution Approach 1:
The patent applies self-service by enabling the charging system to automatically monitor its own charge state and self-adjust transmit power without external intervention. The reception apparatus monitors battery status and communicates it to the transmission apparatus, which autonomously adjusts power levels, achieving high charging precision while keeping the control system relatively simple through self-managed operation.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting the transmit power parameter based on battery charge state. Instead of using fixed power, the system changes power levels adaptively according to real-time battery conditions, achieving precise charging control while maintaining manageable system complexity through parameter-based adaptation.
3Loss of energy
If adaptive power control is implemented, then power transmission efficiency is improved, but device complexity increases due to additional control mechanisms
Solution Approach 1:
The patent applies universality by designing a control system where the transmission apparatus performs multiple functions: it transmits power, receives charge state information, processes control messages, and adjusts power levels. This multi-functional approach achieves high power transmission efficiency while managing complexity by consolidating control functions within existing communication and power management infrastructure.
4Manufacturing precision
If continuous monitoring of charge state is performed, then charging precision is improved, but loss of time increases due to continuous communication overhead
Solution Approach 1:
The patent implements periodic action by having the reception apparatus transmit charge state information at regular intervals rather than continuously. This periodic communication approach maintains high charging precision through frequent updates while minimizing time loss by avoiding constant communication overhead, achieving an optimal balance between monitoring accuracy and time efficiency.
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 efficient power transmission and prevents overcharging by dynamically adjusting transmit power based on the battery's charge state, optimizing the charging process and extending battery lifespan.
Implementation Method 1
A technology of charging a battery using wireless power transmission of a magnetic resonance scheme may refer to a technology of performing wireless power transmission through a transmitting and receiving resonance coil
Data Source
AI summary
Provided is a battery charging method using wireless power transmission, the method including: receiving a first message associated with a battery charge start from a reception apparatus; discovering an optimal frequency band for a transmit power signal to be transmitted to the reception apparatus based on the first message; receiving, from the reception apparatus, a second message that includes an extra power value and a charge power value, and is associated with a charge state of the reception apparatus; and adaptively controlling transmit power so that the extra power value is maintained to be constant in proportion to a relationship between the charge power value and a first parameter, based on the second message.