Multi-Frequency Inductive Power Transfer Using Segmented Transformers
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Solution Overview
Problem
Existing wireless power transfer systems face inefficiencies due to lower inductance in smaller devices, leading to power losses and thermal issues, especially when only a small amount of power is needed, and are cumbersome and unsafe in portable applications.
Innovation Solution
The implementation of inductive energy transfer systems operating at multiple frequency bands, using a primary transformer for high-energy transfer at lower frequencies and an auxiliary transformer for low-energy transfer at higher frequencies, with adaptive energy adjustment based on load conditions, and the inclusion of resonant circuitry and AC-to-DC converters to optimize energy transfer efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a single transformer is used in inductive charging devices, then the device structure is simple, but power losses and thermal issues occur when only small amounts of power are needed
Solution Approach 1:
The patent divides the single transformer into two separate transformers: a first transformer with higher inductance and a second transformer with lower inductance. This segmentation allows the system to select the appropriate transformer based on power requirements, thereby reducing power losses and thermal issues while maintaining manageable device structure through modular design.
2Volume of moving object
If the transmitter coil has low inductance to match small device size, then the device is compact, but large circulating currents cause power losses and thermal problems
Solution Approach 1:
The patent implements a dynamic selection mechanism that switches between the first transformer (higher inductance) and the second transformer (lower inductance) based on real-time power requirements. This dynamic adaptation allows the system to use higher inductance when needed to reduce circulating currents and power losses, while still maintaining compact device size through the smaller second transformer for low-power scenarios.
3Adaptability or versatility
If multiple power supplies with different power outputs are used, then various power needs are met, but the system becomes burdensome to use, store, and transport
Solution Approach 1:
The patent integrates two transformers with different power outputs into a single inductive charging device, making it universally capable of meeting various power needs. The device automatically or manually selects the appropriate transformer based on the charging requirements, eliminating the need for users to carry multiple separate power supplies while maintaining full versatility in power delivery options.
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 energy transfer efficiency by minimizing power losses and thermal issues, allowing for safe and efficient charging of small devices with reduced bulk and safety hazards, while enabling flexible energy delivery based on load conditions.
Implementation Method 1
The charging device transfers energy to the electronic device through inductively coupling between a transmitter coil in the charging device and a receiver coil in the electronic device
Implementation Method 2
The first resonant circuitry is associated with a first resonant frequency, and the second resonant circuitry is associated with a second resonant frequency that is different from the first resonant frequency
Data Source
AI summary
A transmitter device in an inductive energy transfer system includes a first transmitter coil operatively connected to a first resonant circuitry. A receiver device includes a first receiver coil operatively connected to a first resonant circuitry. The first transmitter coil and the first receiver coil form a first transformer. The transmitter device, the receiver device, or both the transmitter and receiver devices can also include an auxiliary coil or inductor, which may form an auxiliary transformer. Energy can be transferred from the transmitter device to the receiver device using the first transformer or the auxiliary transformer. The transfer of energy may be adaptively adjusted based on the efficiency of the energy transfer. For example, the transfer of energy can be adjusted based on the operating conditions of the load.