Series Resonator Reactive Voltage Equalization for Wireless Power
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Solution Overview
Problem
Current methods for electric vehicle energy replenishment, such as mechanical connections, face degradation issues due to tribological wear, electrical arcing, and galvanic oxidation, while wireless power transfer using high frequency alternating current lacks efficient methods for generating and transmitting energy from municipal grid sources to electric vehicle energy storage elements in a convenient and timely manner.
Innovation Solution
The implementation of a resonant wireless power transfer system with a series resonant circuit comprising a capacitor and an inductor, where the switching frequency of an inverter is adjusted to equalize the voltages across the reactive components, maintaining the resonant frequency and optimizing power transfer by controlling the inverter's switching frequency based on measured voltage differences between the capacitor and inductor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical connections of electrical conduits are used for power transfer, then electrical energy can be transferred from power grid to vehicle, but the connection degrades over time due to tribological wear, electrical arcing, and galvanic oxidation
Solution Approach 1:
The patent replaces mechanical electrical connections with wireless electromagnetic field-based power transfer. The transmitter generates high-frequency alternating current that creates electromagnetic fields, which induce current in the receiver coil, transferring power without physical contact. This eliminates mechanical wear, electrical arcing, and galvanic oxidation issues inherent in pluggable connectors.
Solution Approach 2:
The patent introduces electromagnetic fields as an intermediary medium for power transfer. Instead of direct electrical contact between transmitter and receiver, energy is transmitted through electromagnetic fields generated by the transmitter coil and captured by the receiver coil, serving as a non-contact intermediary that eliminates the need for degradable mechanical connections.
2Ease of operation
If high frequency alternating current is used for wireless power transfer, then energy can be transferred over distance with small antennas, but efficient generation and transmission from municipal grid sources is lacking
Solution Approach 1:
The patent employs dynamic frequency adjustment and voltage balancing control to optimize power transfer efficiency. The system continuously monitors the resonant frequency of the series resonant circuit and adjusts the inverter switching frequency accordingly, while also balancing voltages across capacitive and inductive reactances to maintain optimal operating conditions and maximize productivity.
Solution Approach 2:
The patent changes operating parameters including switching frequency, voltage levels, and resonant frequency to optimize power transfer. By adjusting these parameters dynamically based on load conditions and maintaining voltage equality across reactive components, the system achieves efficient power transfer from municipal grid sources to vehicle energy storage elements.
3Productivity
If voltage equality across reactive components is maintained in series resonant circuit, then power transfer efficiency is optimized, but requires continuous frequency adjustment and control
Solution Approach 1:
The patent implements a feedback control system that continuously monitors voltage across capacitive and inductive reactances in the series resonant circuit. Based on these measurements, the controller adjusts the inverter switching frequency to maintain voltage equality, ensuring optimal power transfer efficiency. This closed-loop feedback mechanism automatically compensates for parameter variations without requiring complex manual intervention.
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 enhances the efficiency and reliability of wireless power transfer by maintaining voltage equality across the resonant circuit components, thereby improving the power transfer efficiency and extending the system's operational lifespan.
Implementation Method 1
WPT by convention is accomplished with a high frequency alternating current. As it is known that a time varying field will induce energy from a transmitter to a receiver over empty space.
Implementation Method 2
The resonant circuit is a series resonant circuit which includes a capacitor and an inductor. The reactive voltage across the capacitive reactance is balanced with the reactive voltage across the inductive reactance.
Data Source
AI summary
A wireless power transmission method of control is disclosed where equalization of the reactive voltages of a series resonant circuit, which is part of a transmitter antenna tuning and coupling unit, is obtained by adjusting the switching frequency and thereby used to determine a switching frequency of the driving high frequency inverter. By measuring and largely equalizing the voltage parameters of the series resonant circuit to establish an inverter switching frequency, improved efficiency of the wireless power transmission method.