Wireless Power Transmitter Center Tap Inductor Segmentation
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Solution Overview
Problem
Existing wireless power transmission systems face challenges in efficiently and safely supplying power to receiving devices in loosely-coupled systems, necessitating the development of improved technologies for charging portable devices.
Innovation Solution
A wireless power transmission system incorporating a transmission unit with a first inductor, pre-regulator, switching circuit, and resonant circuit, where the pre-regulator provides current to the inductor's center tap, and transistors alternately couple the end taps to ground at a frequency, magnetically coupling the resonant circuit to efficiently transmit power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If wireless power transmitters are widely distributed in loosely-coupled systems, then power availability to multiple devices is improved, but efficiency and safety of power supply deteriorates
Solution Approach 1:
The inductor is segmented into three taps (center tap and two end taps), allowing independent control of different portions of the inductor. This segmentation enables the switching circuit to selectively couple only the necessary portions to ground, reducing energy loss while maintaining power availability for multiple devices.
Solution Approach 2:
The switching circuit alternately couples the end taps to ground at a specific frequency, creating periodic action that resonates with the resonant circuit. This periodic switching enables efficient power transfer to multiple devices simultaneously while minimizing energy loss through resonant frequency matching.
2Productivity
If switching circuit alternately couples end taps to ground at high frequency, then power transmission efficiency is improved, but switching losses increase
Solution Approach 1:
The switching circuit operates at a frequency that resonates with the resonant circuit, creating a vibratory effect that enhances power transfer efficiency. This resonant frequency matching reduces the energy loss during switching operations by synchronizing the switching action with the natural oscillation of the resonant circuit.
Solution Approach 2:
The system changes the operating frequency parameter to match the resonant frequency of the resonant circuit. By adjusting the switching frequency to resonate with the resonant circuit, the system achieves efficient power transmission while minimizing switching losses through constructive interference of the oscillating currents.
3Reliability
If pre-regulator provides current to center tap, then power supply stability is improved, but device complexity increases
Solution Approach 1:
The pre-regulator is applied specifically to the center tap of the inductor, providing localized current regulation only where needed. This local quality approach ensures power supply stability at the critical center tap point without requiring complex regulation across the entire circuit, thus maintaining simplicity while improving reliability.
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 solution enables efficient and safe wireless power transmission, supporting simultaneous charging of multiple devices and adapting to power requirements, while minimizing switching losses and ensuring reliable operation within established standards like A4WP.
Implementation Method 1
a resonant circuit magnetically coupled to the first inductor, the resonant circuit wirelessly transmitting power
Data Source
AI summary
A wireless power transmission system is presented. In some embodiments, a transmission unit includes a first inductor with a center tap, a first end tap, and a second end tap; a pre-regulator coupled to provide current to the center tap; a switching circuit coupled to the first end tap and the second end tap, the switching circuit alternately coupling the first end tap and the second end tap to ground at a frequency; and a resonant circuit magnetically coupled to the first inductor, the resonant circuit wirelessly transmitting power. In some embodiments, the switching circuit can be formed of FETs. The current provided to the center tap can be controlled in response to current sensors.