Concentric Wireless Power Coils with 180-Degree Phase Shift
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Solution Overview
Problem
Existing methods for wirelessly transmitting power to mobile devices face inefficiencies and safety concerns due to potential discharging and overheating issues, particularly with direct terminal connections, which can lead to reduced device lifespan and performance degradation.
Innovation Solution
A wireless power transmitting device utilizing two concentrically layered power transmitting coils with a phase difference of 180°, controlled by a power supply unit that includes a PWM controller and series resonance converters, to enhance power transmission efficiency and adjust power based on charging status signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If direct terminal connection is used for power transmission, then power can be transmitted to the receiving device, but instantaneous discharging occurs due to potential difference causing terminal abrasion and heat generation
Solution Approach 1:
The patent introduces a wireless power transmission system as an intermediary between the power source and receiving device. The transmitting coil generates an electromagnetic field that induces current in the receiving coil, enabling power transfer without direct physical contact between terminals, thus eliminating instantaneous discharging and heat generation at connection points
Solution Approach 2:
The patent replaces the mechanical terminal connection system with an electromagnetic field-based wireless transmission system. By substituting the mechanical contact method with electromagnetic induction, the harmful effects of direct terminal connection (abrasion, heat, instantaneous discharging) are eliminated while maintaining power transmission functionality
2Device complexity
If single power transmitting coil is used, then device complexity is reduced, but power transmission efficiency and amplitude are insufficient
Solution Approach 1:
The patent combines two power transmitting coils into a single wireless power transmission system. The coils are configured to generate electromagnetic fields that work together, producing a combined power signal with amplitude approximately four times greater than a single coil, thereby enhancing power transmission efficiency without significantly increasing device complexity
Solution Approach 2:
The patent transitions from a single-dimension (single coil) power transmission approach to a multi-dimensional approach by layering two coils concentrically. This spatial arrangement allows the electromagnetic fields to combine constructively, achieving higher amplitude and more efficient power transmission while maintaining a compact structure
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 configuration increases the total amplitude of power signals, resulting in about four times more power transmitted to the receiving device, while also enabling overheating prevention and efficient charging control.
Implementation Method 1
a wireless power transmitting device which wirelessly transmits power to a power receiving device
Implementation Method 2
a power supply unit configured to supply alternating current powers to the first power transmitting coil and the second power transmitting coil so as to allow the first power signal and the second power signal to have a phase difference of 180°
Data Source
AI summary
There are provided a device and a method for wirelessly transmitting a power in which a power is wirelessly transmitted to a power receiving device with high transmission efficiency. The wireless power transmitting device includes a first power transmitting coil configured to transmit a first power signal, a second power transmitting coil that is concentrically layered with the first power transmitting coil to transmit a second power signal, and a power supply unit configured to supply alternating current powers to the first power transmitting coil and the second power transmitting coil so as to allow the first power signal and the second power signal to have a phase difference of 180°.