Wireless Power Transmission System Impedance Control
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Solution Overview
Problem
Existing wireless power transmission systems face inefficiencies and potential component damage due to non-uniform power supply to batteries, especially when increasing transmission voltage, leading to overcurrent issues and unstable power initiation.
Innovation Solution
The system incorporates a wireless power transmission system with parameter-set passive elements in both the power transmission and reception devices, ensuring the absolute value of the inverse transfer function between input and output voltages remains within a specific ratio, stabilizing power supply and preventing overcurrent by uniformly increasing power transmission voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If transmission voltage is increased to improve power transmission efficiency, then power transmission efficiency is improved, but circuit elements may be damaged by overcurrent
Solution Approach 1:
The patent applies preliminary action by setting the impedance on the power reception-side to an appropriate value before turning on the power transmission-side. This preliminary impedance setting ensures that when power transmission voltage is increased, the system is already configured to handle the power flow properly, preventing overcurrent damage while maintaining high transmission efficiency.
Solution Approach 2:
The patent applies parameter changes by adjusting the impedance parameter on the power reception-side to an optimal value. This parameter optimization allows the system to transmit higher power with improved efficiency while the optimized impedance prevents excessive current that could damage circuit elements.
2Device complexity
If impedance is not set to appropriate value, then device complexity is reduced, but power transmission efficiency deteriorates and power loss increases
Solution Approach 1:
The patent applies self-service by configuring the power reception-side impedance to be appropriately set, which then enables the power transmission-side to operate efficiently without requiring complex external impedance control mechanisms. The properly set impedance on the reception-side essentially controls the overall system efficiency, reducing power loss without adding device complexity.
3Power
If power transmission voltage rises without proper control, then power transmission capability is improved, but stability of power supply deteriorates
Solution Approach 1:
The patent applies feedback by monitoring the power transmission process and maintaining stable power supply through the appropriately set impedance on the power reception-side. This impedance configuration provides a stabilizing feedback mechanism that allows the system to transmit high power while maintaining supply stability, preventing drastic power fluctuations.
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 configuration ensures stable and uniform power transmission to batteries, preventing overcurrent and allowing safe initiation of power transmission, even when increasing transmission voltage, by maintaining a consistent power supply ratio.
Implementation Method 1
a power transmission resonator configured to generate a magnetic field corresponding to the AC voltage
Implementation Method 2
a power reception resonator configured to receive AC power via the magnetic field
Data Source
AI summary
According to one embodiment, a wireless power transmission system includes: an AC power source; a power transmission resonator; a power reception resonator; an AC/DC converter; a first circuit disposed between the AC power source and the power transmission resonator; and a second circuit disposed between the power reception resonator and the AC/DC converter. Parameter values of passive elements in the first and second circuits are set so that an absolute value of an inverse transfer function between an input voltage and an output voltage of a target system at a frequency of the AC voltage is equal to or less than a divided value of the AC voltage by a battery voltage while the AC voltage is increased from a first voltage value to a second voltage value, the target system comprising the first circuit, the power transmission resonator, the power reception resonator, the second circuit and the AC/DC converter.