Multi-Transmitter Wireless Charging Current Control for Mutual Inductance
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Solution Overview
Problem
Existing wireless power charging technologies face challenges in achieving maximum efficiency due to variations in the charging environment and the influence of environmental factors on mutual inductance.
Innovation Solution
A wireless power charging apparatus and method that includes multiple transmitters and receivers, each equipped with a transmission or reception resonance unit comprising a capacitor and an inductor. A control unit determines mutual inductance, equivalent load impedance, and current ratios to optimize the output current of each transmitter, thereby maximizing charging efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If wireless power transmission is performed using multiple transmitters and receivers, then power transmission capability is improved, but charging efficiency deteriorates due to environmental variations and mutual inductance influence
Solution Approach 1:
The patent applies dynamics by making the transmission resonance units and reception resonance units adjustable in resonance frequency. The control unit dynamically adjusts the resonance frequency of each transmitter and receiver to match their mutual inductance characteristics, ensuring optimal power transmission efficiency despite environmental variations. This dynamic adjustment resolves the contradiction by adapting the system to changing conditions rather than operating at fixed frequencies.
Solution Approach 2:
The patent changes the resonance frequency parameter of the transmission and reception resonance units based on measured mutual inductance values. By adjusting this critical parameter, the system optimizes power transfer efficiency for each transmitter-receiver pair. The control unit calculates the optimal resonance frequency that maximizes charging efficiency while maintaining the required power transmission capability.
2Power
If resonance frequency is matched between transmitters and receivers, then maximum power transmission is achieved, but system complexity increases due to need for mutual inductance determination and frequency adjustment
Solution Approach 1:
The patent segments the power transmission system into independent transmission resonance units and reception resonance units, each with its own controllable resonance frequency. This segmentation allows each unit to be independently adjusted to match mutual inductance characteristics, simplifying the overall control strategy. The control unit manages each segment separately, determining mutual inductance and adjusting frequencies in a systematic manner that reduces overall system complexity.
Solution Approach 2:
The patent implements feedback by having the control unit measure mutual inductance between transmitters and receivers, then use this information to adjust resonance frequencies. This closed-loop feedback mechanism automatically optimizes power transmission without requiring complex manual configuration. The system continuously monitors and adjusts parameters based on actual operating conditions, reducing complexity through automated adaptation.
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 solution enables wireless charging with maximum efficiency by precisely controlling the output current of transmitters based on mutual inductance and load impedance, effectively addressing environmental variations and improving overall charging performance.
Implementation Method 1
The transmitter transmits power to the receiver in the type of generating and copying a magnetic field to the receiver
Implementation Method 2
The maximum power transmission can be generated in the wireless power transmission apparatus when they have the same resonance frequency
Data Source
AI summary
The present disclosure relates to an efficient wireless power charging apparatus and a method thereof. The wireless power charging apparatus includes: a plurality of transmitters each including a transmission resonance unit configured to transmit power using power provided from a power unit and including one capacitor and one inductor; a receiver including a reception resonance unit configured to receive power transmitted from the plurality of transmission resonance units and including one capacitor and one inductor, and a load performing charging using received power; and a control unit configured to determine mutual inductance between each of the transmission resonance units and each of the reception units and equivalent load impedance of the receiver, configured to determine any one of the plurality of transmitters as a reference transmitter and determine a current ratio between the reference transmitter and another transmitter, and configured to determine an output current of each of the plurality of transmitters using each of the mutual inductances, the equivalent load impedance of the receiver, and the current ratio between the reference transmitter and another transmitter.