Wireless Power Transfer Controller Optimizing Output via Frequency and Duty Ratio
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Solution Overview
Problem
Wireless charging systems have lower power output compared to wired charging, leading to longer charging times and reduced power conversion efficiency due to decreased output current, which hinders their development and adoption.
Innovation Solution
A non-contact type power transfer apparatus that includes a power converter, a power transmitter, and a controller to adjust the power level by controlling the switching frequency, duty ratio, and phase of the power converter and supply, ensuring operations within a reference range to optimize power transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wireless charging is implemented, then convenience and non-contact power transfer are improved, but power output and charging speed deteriorate
Solution Approach 1:
The patent implements dynamic control of the power converter by continuously monitoring the transmission power state and adjusting the power conversion control signal in real-time. This includes dynamically modifying switching frequency and duty ratio based on feedback from the power transmission state, allowing the system to adapt to varying load conditions and maintain optimal power output levels throughout the charging process.
Solution Approach 2:
The patent changes key operational parameters of the power converter, specifically switching frequency and duty ratio, to optimize power transmission. By adjusting these parameters based on the transmission power state, the system can control the power conversion process to achieve higher output power while maintaining efficient wireless power transfer.
2Reliability
If output current is decreased for wireless charging, then safety and control are improved, but power conversion efficiency deteriorates
Solution Approach 1:
The patent implements a feedback control mechanism where the controller continuously monitors the state of transmission power and uses this information to adjust the power conversion control signal. This closed-loop feedback system ensures that the power converter operates at optimal efficiency points while maintaining safe and controlled charging, preventing energy loss by avoiding over-current conditions and optimizing the power conversion process in real-time.
3Loss of energy
If switching frequency and duty ratio are optimized, then power conversion efficiency is improved, but system complexity increases
Solution Approach 1:
The patent designs the controller to perform multiple functions: monitoring transmission power state, calculating optimal switching parameters, generating power conversion control signals, and adjusting input power levels. This multi-functional controller consolidates what could be separate complex subsystems into a single integrated unit, achieving high power conversion efficiency through sophisticated parameter optimization while managing system complexity through functional integration.
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
The apparatus improves power conversion efficiency and increases the output power of wireless charging systems, enabling faster charging times and higher power transfer efficiency compared to existing wireless charging technologies.
Implementation Method 1
a power converter configured to convert input power into transmission power
Implementation Method 2
a power transmitter configured to transmit the transmission power in a non-contact manner
Data Source
AI summary
A non-contact type power transfer apparatus includes a power converter configured to convert input power into transmission power; a power transmitter configured to transmit the transmission power in a non-contact manner; and a controller configured to provide a power conversion control signal to control a power conversion operation of the power converter according to a state of the transmission power, and to output an input power control signal to control a power level of the input power according to the power conversion control signal.