Wireless Power Transmitter Verification Load for 15 mm Gap Charging
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Solution Overview
Problem
Existing wireless power transfer systems are limited to small separation gaps (3-5 mm) between transmitter and receiver coils, preventing efficient charging through furniture or with device cases, and require precise power control and verification for commercial applications.
Innovation Solution
A wireless power transmitter with a ferrite core surrounding three sides of the antenna, operating at 87-205 kHz, and a control and communications unit for power control and verification, allowing larger gap operation and compatibility with off-the-shelf power supplies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If legacy near-field wireless power transfer systems are used, then power transfer is efficient at small gaps, but the separation gap is limited to 3-5 mm which prevents charging through furniture or with device cases
Solution Approach 1:
The patent changes the operating frequency parameter from the traditional 6.78 MHz to a lower range of 87-205 kHz, which fundamentally alters the electromagnetic field characteristics and enables operation at larger separation gaps while maintaining reliable power transfer
Solution Approach 2:
The system dynamically adjusts power levels and operates in different modes (power up mode, power down mode, verification mode) to maintain reliable power transfer across varying separation gaps and loading conditions
2Measurement precision
If precision power control is implemented for commercial applications, then power level accuracy is improved, but device complexity and cost increase due to expensive voltage regulation components
Solution Approach 1:
The patent replaces traditional mechanical/electronic voltage regulation components with a control system that uses software-based power management and verification algorithms to achieve precise power control without expensive hardware
Solution Approach 2:
The system performs self-verification of power delivery by monitoring the verification load and automatically adjusting power levels, eliminating the need for external expensive verification equipment
3Measurement precision
If power verification is performed to ensure compliance with power requests, then power capability detection is improved, but the system requires additional verification loads and control mechanisms
Solution Approach 1:
The verification load is merged with the existing power transfer pathway, allowing the same coil and electromagnetic field to be used for both power transfer and verification, rather than requiring separate dedicated verification hardware
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 transfer up to 15 mm gaps with enhanced power control and compatibility, reducing costs by eliminating expensive voltage regulation and supporting various power sources.
Implementation Method 1
inductive wireless power transfer, which occurs when magnetic fields created by a transmitting element induce an electric field, and hence, an electric current, in a receiving element
Implementation Method 2
a ferrite core that substantially surrounds the transmitter antenna on three sides
Data Source
AI summary
A power transmitter for wireless power transfer includes a verification load, 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 verification load is compliant with the power request, and, if the power signal at the verification load 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.