Wireless Power Transmitter Control for 15 mm Charging Gaps
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Solution Overview
Problem
Legacy wireless power transmitters are limited to operation within a separation gap of 3-5 mm, preventing effective wireless charging through furniture and devices with cases, and require more precise power control to meet commercial applications and standards.
Innovation Solution
A wireless power transmitter design with a ferrite core surrounding the antenna on three sides, operating at frequencies between 87 kHz and 205 kHz, and utilizing control and communications units to manage power levels and compatibility with external power sources, allowing operation up to 15 mm separation gaps and enhanced power control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the separation gap between transmitter and receiver coils is increased beyond 3-5 mm, then the applicability to commercial products (furniture, devices with cases) is improved, but the power transfer efficiency and operability deteriorate
Solution Approach 1:
The patent changes the operating frequency parameter from the traditional 6.78 MHz to a lower frequency range of 87 kHz to 205 kHz. This parameter change enables the system to operate effectively at larger separation gaps (up to 15 mm or more) while maintaining power transfer efficiency, thereby resolving the contradiction between adaptability to commercial products and power transfer efficiency.
2Ease of operation
If the separation gap is increased to enable charging through furniture and devices with cases, then the ease of operation is improved, but the reliability of power transmission deteriorates
Solution Approach 1:
By changing the operating frequency to a lower range (87 kHz to 205 kHz), the system achieves reliable power transmission at larger separation gaps, enabling charging through furniture and device cases while maintaining transmission reliability.
Solution Approach 2:
The system incorporates dynamic power level control that adjusts transmission parameters in real-time based on the separation gap and load conditions. This dynamic adjustment maintains reliable power transmission across varying operational conditions, including different gap distances and obstacles.
3Manufacturing precision
If precision power level control is implemented to meet commercial standards, then the manufacturing precision is improved, but the device complexity increases
Solution Approach 1:
The patent implements feedback mechanisms that monitor power transfer conditions and adjust transmission levels accordingly. This feedback-based control achieves precision power level control required by commercial standards while managing device complexity through intelligent control algorithms.
Solution Approach 2:
The control system is designed to handle multiple functions including power level adjustment, gap detection, and compliance with various commercial standards, thereby achieving precision control without proportionally increasing complexity through multi-functional integration.
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 wireless power transmission over larger gaps with improved efficiency and compatibility with off-the-shelf power supplies, reducing costs and enhancing performance.
Implementation Method 1
inductive wireless power transfer, which occurs when magnetic fields created by a transmitting element induce an electric field
Implementation Method 2
magnetic fields created by a transmitting element induce an electric field, and hence, an electric current, in a receiving element
Data Source
AI summary
A power transmitter for wireless power transfer includes a control and communications unit, an inverter circuit, a coil, and a shielding. The control and communications unit is configured to provide power control signals to control a power level of a power signal configured for transmission to a power receiver, provide a power request to an external power supply, determine if a power signal at the coil is compliant with the power request, and, if the power signal at the coil is compliant with the power request, continue to operate for wireless power transmission. The coil is configured to transmit the power signal to a power receiver. The shielding comprises a ferrite core.