Non-Resonant Wireless Power Receiver Eliminates Matching Capacitor
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Solution Overview
Problem
Traditional wireless power transfer systems using resonant structures are sensitive to variations in matching capacitors, limit power transfer to narrow frequency bands, increase complexity and cost, and can cause heat dissipation issues due to the use of receiver-side matching capacitors.
Innovation Solution
A wireless power transfer method and system that eliminates the receiver-side matching capacitor by using a transmitter-side inductor and matching capacitor to compensate for the imaginary part of the reflected impedance, allowing power transfer without a receiver-side matching capacitor, and optimizing coil designs to increase mutual inductance and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a resonant structure with receiver-side matching capacitor is used, then power transfer efficiency is improved, but device complexity and cost increase
Solution Approach 1:
The patent removes the receiver-side matching capacitor from the system, extracting the problematic component that causes complexity and cost issues. The solution transfers the impedance compensation function to the transmitter side, eliminating the need for the receiver-side capacitor while maintaining power transfer efficiency.
Solution Approach 2:
The patent combines the impedance compensation function with the transmitter-side matching capacitor, merging two functions into one component. This eliminates the need for separate receiver-side compensation components, reducing overall device complexity.
2Loss of energy
If a resonant structure with receiver-side matching capacitor is used, then power transfer efficiency is improved, but package dimensions increase
Solution Approach 1:
By removing the receiver-side matching capacitor, the patent eliminates the physical space required for this component and its associated high-voltage rating requirements, thereby reducing the overall package dimensions of the power receiver.
3Loss of energy
If a resonant structure with receiver-side matching capacitor is used, then power transfer efficiency is improved, but heat dissipation increases
Solution Approach 1:
The patent removes the receiver-side matching capacitor, which is the source of parasitic resistance and heat dissipation. By eliminating this component, the system avoids the heat generation problem while maintaining efficient power transfer through transmitter-side compensation.
4Loss of energy
If narrow frequency band near resonant frequency is used, then power transfer efficiency is improved, but adaptability decreases
Solution Approach 1:
The patent implements dynamic frequency tuning capability on the transmitter side, allowing the system to adapt to different operating frequencies. This dynamic adjustment enables the system to maintain efficient power transfer across a broader frequency range, improving adaptability without sacrificing efficiency.
Solution Approach 2:
The patent changes the operating parameters by allowing frequency adjustment on the transmitter side. By modifying the frequency parameter dynamically and compensating for reflected impedance, the system can operate efficiently across multiple frequency bands, enhancing versatility.
5Loss of energy
If transmitter-side and receiver-side matching capacitors are used to match resonant frequencies, then power transfer efficiency is improved, but sensitivity to variations increases
Solution Approach 1:
The patent removes the receiver-side matching capacitor, eliminating the sensitivity issue associated with this component. By concentrating the compensation function on the transmitter side only, the system reduces the number of critical components that require precise matching, thereby improving reliability.
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 reduces unit costs, package dimensions, and heat dissipation risks while maintaining power transfer efficiency and output capability, enabling power transfer across a broader frequency band without the need for complex capacitor switching.
Implementation Method 1
power/energy may be transferred from one or more power transmitter (TX) coils to one or more power receiver (RX) coils through magnetic coupling
Implementation Method 2
The imaginary part of the reflected impedance may be reduced/eliminated by using a transmitter-side matching capacitor and a receiver-side matching capacitor to match the resonant frequencies of the TX and RX coils
Implementation Method 3
inductively coupling a transmitter-side inductor to a receiver-side inductor, the transmitter-side inductor and one or more transmitter-side matching capacitors included in a power transmitter and the receiver-side inductor included in a power receiver
Data Source
AI summary
Methods, systems, and devices for wirelessly providing power to devices using a non-resonant power receiver are disclosed. A transmitter-side inductor may be inductively coupled to a receiver-side inductor. The transmitter-side inductor and one or more transmitter-side matching capacitors may be included in a power transmitter. The receiver-side inductor may be included in a power receiver. The power receiver may not include a receiver-side matching capacitor. Power from the power transmitter may be provided to the power receiver via the inductive coupling between the transmitter-side inductor and the receiver-side inductor. The power receiver may provide a reflected impedance including a real part and an imaginary part to the power transmitter. The transmitter-side matching capacitor(s) may compensate for the imaginary part of the reflected impedance.