Resonant Wireless Power Circuit for Variable Receiver Loads
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Solution Overview
Problem
Existing wireless power transmission systems using magnetic resonance coupling require complex circuit configurations and feedback control mechanisms to prevent circuit failures due to overcurrents when the number of power reception devices changes in the transmission area.
Innovation Solution
A wireless power transmission device with a resonant circuit designed to adjust impedance based on the number of power reception devices, using a matching circuit and power transmission coil, where the total impedance decreases as more devices are added, ensuring stable operation without feedback control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If feedback control circuits and communication circuits are added to control power amount, then circuit safety is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The resonant circuit is designed to automatically adjust its total impedance based on the number of power reception devices in the transmission area. The circuit self-regulates current levels through its inherent impedance characteristics, eliminating the need for external feedback control circuits and communication circuits to manage power safety.
Solution Approach 2:
The resonant circuit's total impedance parameter is specifically designed to decrease as more power reception devices are added to the transmission area. This parameter change automatically adapts the circuit to varying load conditions, maintaining safety without requiring complex control mechanisms.
2Productivity
If maximum power is transmitted when transmission and reception devices have the same resonance frequency, then power transmission efficiency is improved, but overcurrent risk increases when reception devices are absent or leave the transmission area
Solution Approach 1:
The resonant circuit is pre-designed with specific impedance characteristics that account for varying numbers of reception devices. The total impedance is configured to decrease progressively as devices are added, preparing the circuit to handle different load scenarios without requiring real-time control adjustments.
Solution Approach 2:
The total impedance of the resonant circuit is designed to be dynamic relative to the number of reception devices. When devices are absent or leave the transmission area, the circuit's impedance characteristics prevent excessive current flow, while allowing maximum power transmission when devices are present and properly coupled.
3Power
If the resonant circuit is optimized for impedance matching, then power transmission performance is improved, but the circuit becomes vulnerable to overcurrent when the number of reception devices changes
Solution Approach 1:
The resonant circuit is designed with universal impedance characteristics that accommodate multiple reception devices simultaneously. The total impedance decreases in a controlled manner as devices are added, allowing the circuit to maintain optimal performance across varying load conditions without requiring separate optimization for each scenario.
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 system achieves stable power transmission with a simplified circuit configuration, reducing costs and preventing circuit failures by adjusting impedance to accommodate varying numbers of power reception devices.
Implementation Method 1
transmitting power to at least one power reception coil through resonance coupling of a magnetic resonance
Implementation Method 2
a magnetic induction method, a magnetic resonance method
Data Source
AI summary
The present invention relates to a wireless power transmission device capable of stably operating without controlling the amount of power to prevent a circuit failure due to an overcurrent, when there is a change in the number of wireless power reception devices in a power transmission area of the wireless power transmission device, during the transmission of power using a magnetic resonance coupling method, a wireless power reception device, and a wireless power transmission and reception system including the wireless power transmission device and the wireless power reception device.