Wireless Energy Receiver Frequency Tuning via Inductor Current Control
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Solution Overview
Problem
Current wireless energy transmission using magnetic resonance faces challenges in accurately tuning resonance frequency due to difficulties in adjusting inductance and capacitance values.
Innovation Solution
A wireless energy transmission system employing a quadrature oscillator with in-phase and quadrature-phase signals, where the resonance frequency is adjusted by changing the current through inductors, allowing for precise frequency matching without direct adjustments to inductance or capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If capacitance value is adjusted for resonance frequency tuning, then resonance frequency can be tuned, but it is not easy to finely adjust the capacitance value making accurate tuning difficult
Solution Approach 1:
The patent changes the tuning parameter from capacitance value to inductor current. By controlling the current through the inductor, the resonance frequency can be precisely adjusted without the difficulty of fine-tuning capacitance values. The controller regulates the inductor current to match the transmitter's resonance frequency, achieving accurate frequency tuning through current control rather than capacitance adjustment.
2Measurement precision
If inductance value is adjusted for resonance frequency tuning, then resonance frequency can be tuned, but direct adjustment of inductance value is complex and difficult
Solution Approach 1:
The patent transforms the tuning mechanism from direct inductance value adjustment to inductor current control. Instead of physically changing the inductance value which requires complex mechanical or electrical adjustments, the system controls the current flowing through the inductor. This current control approach simplifies the tuning mechanism while maintaining precise resonance frequency adjustment capability through the controller.
3Length of stationary object
If electromagnetic induction is used for wireless energy transmission, then energy can be transmitted, but transmission distance is limited to relatively short distances
Solution Approach 1:
The patent employs magnetic resonance coupling between transmitter and receiver coils, utilizing resonant oscillation at a common frequency to enhance energy transfer. By tuning both coils to the same resonance frequency through inductor current control, the system achieves efficient energy transmission over extended distances compared to conventional electromagnetic induction, reducing energy loss while increasing transmission range.
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 enables efficient wireless energy transfer by accurately matching resonance frequencies, enhancing energy transfer efficiency and stability across distances.
Implementation Method 1
A great deal of research into wireless energy transmission using electromagnetic induction has been conducted
Implementation Method 2
In order to overcome this limitation, a method of using magnetic resonance has been introduced
Implementation Method 3
LC resonance may be used and a common resonance frequency may be tuned between a transmitter/receiver pair
Data Source
AI summary
A wireless energy transmission system includes a wireless energy transmitting device and a wireless energy receiving device configured to receive power from the wireless energy transmitting device through a magnetic field. The wireless energy transmitting device includes a signal generator configured to include a resonator including at least one inductor and at least one capacitor and to generate at least two signals having a 90-degree phase difference from each other. The wireless energy receiving device includes a frequency adjustor configured to match a frequency between the wireless energy transmitting device and the wireless energy receiving device.