Wireless Charging Transmitter Electronics in Remote Connector
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wireless inductive charging systems for wearables have bulky transmitter units due to housed transmitter electronics, increasing the form factor and hindering optimization of charging efficiency.
Innovation Solution
The solution involves a wireless charging system where transmitter electronics are housed in a separate connector, such as a USB plug, remote from the primary coil, allowing for varying switching frequency and impedance to optimize magnetic coupling and power transfer, thereby reducing the form factor while maintaining efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmitter electronics are housed in the transmitter unit, then wireless charging functionality is achieved, but the form factor increases and becomes bulky
Solution Approach 1:
The wireless charging system is divided into two separate parts: a compact transmitter unit containing only the primary coil, and a separate connector housing all the transmitter electronics (oscillator circuits, modulator circuits, control logic). This segmentation allows the transmitter unit to maintain a small form factor while the electronics are relocated to the connector, resolving the contradiction between functionality and compactness.
Solution Approach 2:
The transmitter electronics (oscillator circuits, modulator circuits, and control components) are extracted from the transmitter unit and housed in a separate connector. This extraction removes the bulky electronic components from the transmitter unit, enabling it to achieve a compact form factor while maintaining wireless charging functionality through the separated architecture.
2Volume of moving object
If transmitter unit size is reduced, then form factor is optimized, but efficiency of wireless charging may be compromised
Solution Approach 1:
A tank circuit is introduced as an intermediary component between the primary coil and the load, coupled to the primary coil through a coupling capacitor. This tank circuit acts as a resonant buffer that maintains efficient energy transfer even with the reduced transmitter unit size, compensating for the separation of electronics and coil while preserving charging efficiency.
Solution Approach 2:
The system dynamically adjusts operating parameters including switching frequency and impedance of the tank circuit to optimize magnetic coupling and power transfer efficiency. By varying these parameters, the system maintains high efficiency despite the compact transmitter unit design and separation of electronics from the coil.
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 reduces the form factor of the transmitter unit while maintaining efficient wireless charging, allowing for compact design without compromising power transfer efficiency, supporting up to 5W applications and adhering to Qi compatibility standards.
Implementation Method 1
The tank circuit is configured to magnetically couple the first transformer coil and a second transformer coil of a user device based on the at least one of the switching frequency and the impedance, such that the first transformer coil powers the user device based on the magnetic coupling
Data Source
AI summary
A wireless charging system includes an electrical and/or electronic interconnect as first connector. The transmitter electronics are included in the first connector. The first connector is electrically connected to a second connector via a cable. The second connector includes a transmitter coil. The first connector, cable, and the second connector are form the transmitter portion of the wireless charging system. Information from a receiver is obtained by the first connector which demodulates and processes the information and based on the request from the receiver changes the impedance and switching frequency of a tank circuit of the transmitter coil. Efficiency of the wireless charging system is optimized while reducing the form factor.