Wireless Power Resonator Switching for Voltage Mismatch
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Solution Overview
Problem
Existing wireless power transmission systems face inefficiencies in transferring power to loads due to voltage mismatches between the received power and the load, leading to reduced power transfer and the need for additional DC/DC converters to boost voltage, which increases system complexity and cost.
Innovation Solution
A wireless power reception apparatus that includes a reception resonator, a switch controller, and a switch, which generates a control signal to deactivate the resonator at optimal times based on sensed voltage peaks, allowing for efficient power transfer without the need for a separate DC/DC converter by utilizing the resonator's inductor to perform DC/DC conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a separate DC/DC converter is added to boost voltage, then voltage matching for the load is improved, but device complexity and cost increase
Solution Approach 1:
The patent merges the DC/DC conversion function with the existing resonator inductor by controlling its switching state. The inductor L2 normally serves as part of the resonant circuit, but when the switch is activated, it simultaneously performs voltage boosting for the load, combining two functions into one component and eliminating the need for a separate DC/DC converter.
Solution Approach 2:
The resonator inductor is designed to serve dual purposes: maintaining resonance for wireless power reception and performing DC/DC voltage conversion for load matching. By controlling the switch connected to the inductor, the system enables the same component to adapt its function based on operational requirements, achieving multi-functionality without additional hardware.
2Adaptability or versatility
If a separate DC/DC converter is added to boost voltage, then voltage matching for the load is improved, but system cost increases
Solution Approach 1:
The patent merges the DC/DC conversion function with the existing resonator inductor by controlling its switching state. The inductor L2 normally serves as part of the resonant circuit, but when the switch is activated, it simultaneously performs voltage boosting for the load, combining two functions into one component and eliminating the need for a separate DC/DC converter.
Solution Approach 2:
The resonator inductor is designed to serve dual purposes: maintaining resonance for wireless power reception and performing DC/DC voltage conversion for load matching. By controlling the switch connected to the inductor, the system enables the same component to adapt its function based on operational requirements, achieving multi-functionality without additional hardware.
3Duration of action of stationary object
If the resonator is continuously active, then power reception is maintained, but power transfer efficiency decreases due to voltage mismatches
Solution Approach 1:
The patent employs periodic switching of the resonator based on the oscillation cycle of the received power. The switch controller detects voltage peaks and zero-crossing points to determine optimal switching moments, activating the resonator only during phases when it contributes to efficient power transfer. This periodic control maintains power reception continuity while maximizing transfer efficiency by avoiding operation during voltage mismatch conditions.
Solution Approach 2:
The system uses feedback from voltage sensing to control the resonator switching. The switch controller monitors the voltage waveform from the resonator and adjusts the switching timing accordingly, creating a closed-loop control system that optimizes power transfer efficiency while maintaining continuous power reception capability.
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 solution enhances power transfer efficiency and provides appropriate voltage to the load, reducing system size and cost by eliminating the need for additional converters and improving power handling across voltage mismatches.
Implementation Method 1
a reception (RX) resonator configured to form a resonance coupling with a first resonance period associated with an envelope of a power to receive the power from a transmission (TX) resonator
Implementation Method 2
wireless power transmission system using resonance characteristics may include a source configured to supply a power, and a target configured to receive the supplied power
Data Source
AI summary
A wireless power reception apparatus includes a reception (RX) resonator configured to form a resonance coupling with a first resonance period associated with an envelope of a power to receive the power from a transmission (TX) resonator; a switch controller configured to generate, at intervals of the first resonance period, a control signal to deactivate the RX resonator at an off timing corresponding to a time instant at which a maximum energy is stored in an inductor of the RX resonator; and a switch configured to deactivate the RX resonator in response to the control signal.