Wireless Power Frequency Adjustment via Phase Difference Control
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Solution Overview
Problem
Current wireless power transfer methods are inefficient for transferring useful amounts of electrical power over mid-range distances and alignment offsets, as they either suffer from the limitations of radiative transmission schemes or the short-range capabilities of traditional induction schemes.
Innovation Solution
A wireless power transfer system that includes a power transmitting apparatus, a power receiving apparatus connected to an electrical load, and a controller that adjusts the frequency of the transmitted power based on the phase difference between output voltage and current waveforms to optimize energy transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If radiative wireless power transmission is used, then power can be transmitted over long distances, but transmission efficiency becomes very low with most power radiated away in all directions
Solution Approach 1:
The patent applies local quality by creating a concentrated magnetic near-field in the specific spatial region between the primary and secondary coils, rather than radiating energy uniformly in all directions. This localized field concentration enables efficient power transfer over extended distances while minimizing energy loss to surrounding areas.
Solution Approach 2:
The patent introduces an oscillating magnetic near-field as an intermediary medium to transfer power wirelessly between the primary power supply unit and the secondary receiver unit. This magnetic field acts as a mediator that carries energy through the spatial gap, enabling power transmission over distances greater than traditional direct induction while maintaining efficiency.
2Loss of energy
If traditional induction schemes are used, then power transfer efficiency is maintained, but transmission distance is limited to very short ranges with small offset tolerances
Solution Approach 1:
The patent applies dynamics by using an oscillating magnetic near-field that dynamically extends the interaction range between primary and secondary coils. This oscillating field creates a time-varying magnetic environment that maintains coupling between coils over greater distances and with larger offset tolerances compared to static traditional induction schemes.
Solution Approach 2:
The patent changes the operating parameters by utilizing an oscillating magnetic near-field with specific frequency and amplitude characteristics that enable power transfer over mid-range distances. By adjusting the oscillation parameters, the system can maintain efficient power transfer across varying distances and alignment conditions, overcoming the fixed short-range limitation of traditional induction.
3Loss of energy
If directional antennas are used to confine and direct radiated energy towards a receiver, then transmission efficiency improves, but the system requires uninterruptible line-of-sight and complicated tracking and steering mechanisms
Solution Approach 1:
The patent replaces the mechanical tracking and steering mechanisms of directional antenna systems with a magnetic near-field coupling system. This substitution eliminates the need for complex mechanical adjustments and uninterrupted line-of-sight requirements, as the oscillating magnetic field naturally couples the primary and secondary coils over mid-range distances without requiring precise mechanical alignment or active tracking.
4Power
If directional antennas with high power transmission are used, then energy transfer capability is improved, but hazards are posed to objects or people that cross or intersect the beam
Solution Approach 1:
The patent confines the high-power energy transmission to a localized magnetic near-field region between the primary and secondary coils, rather than creating a broad directional beam. This localized field concentration delivers high power capability where needed while minimizing exposure to surrounding objects and people, thereby reducing safety hazards associated with high-power radiative systems.
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
Enables efficient wireless power transfer over greater distances and alignment offsets, improving the efficiency and practicality of energy transfer compared to traditional methods while minimizing risks and complexities.
Implementation Method 1
A wireless power transfer system that includes a power transmitting apparatus, a power receiving apparatus connected to an electrical load, and a controller that adjusts the frequency of the transmitted power
Implementation Method 2
a controller connected to the power transmitting apparatus and configured to receive information about a phase difference between output voltage and current waveforms in a power source of the power transmitting apparatus, and adjust a frequency of the transmitted power based on the measured phase difference
Data Source
AI summary
The disclosure features wireless power transfer systems that include a power transmitting apparatus configured to wirelessly transmit power, a power receiving apparatus connected to an electrical load and configured to receive power from the power transmitting apparatus, and a controller connected to the power transmitting apparatus and configured to receive information about a phase difference between output voltage and current waveforms in a power source of the power transmitting apparatus, and to adjust a frequency of the transmitted power based on the measured phase difference.