Wireless Charging Transmitter Decoupling Circuit
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Solution Overview
Problem
Existing wireless charging transmitter systems face increased power loss due to strong coupling between transmit coils, especially in environments with metals, which affects efficiency and supports limited charging postures.
Innovation Solution
The system incorporates at least two transmit coils, two transmit circuits, and a decoupling circuit with inductors and capacitors to offset induced electromotive forces, and a control circuit to dynamically adjust switch states in compensation circuits, ensuring induced circuit parameters meet predetermined thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple transmit coils operate collaboratively to support wireless power transfer in any posture, then charging versatility is improved, but coupling between transmit coils increases causing power loss
Solution Approach 1:
The patent introduces a decoupling circuit as an intermediary component between the transmit coils. This circuit includes capacitors connected to each transmit coil that act as mediators to cancel out the mutual inductance effects between adjacent coils, thereby reducing power loss while maintaining the ability of multiple coils to operate collaboratively for versatile charging postures
2Productivity
If transmit coils are positioned close together to improve charging efficiency, then power transfer efficiency is improved, but coupling between coils increases causing power loss
Solution Approach 1:
The decoupling circuit with capacitors serves as an intermediary that enables transmit coils to be positioned close together for improved charging efficiency while canceling out the harmful coupling effects. The capacitors compensate for mutual inductance, allowing close positioning without the penalty of increased power loss
3Adaptability or versatility
If multiple transmit coils are used to support diverse charging environments, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent divides the decoupling function into separate capacitor components associated with each transmit coil. This segmentation allows the system to handle multiple coils and diverse charging environments while keeping each individual coil's decoupling mechanism simple and modular, thereby managing overall system complexity
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 reduces power loss and improves efficiency by finely adjusting mutual-inductance and decoupling precision, supporting diverse charging postures and environments.
Implementation Method 1
The decoupling circuit includes a first inductor, a second inductor, a first capacitor, and a second capacitor, wherein the first inductor and the first capacitor form a first parallel circuit, the second inductor and the second capacitor form a second parallel circuit, the first inductor and the second inductor are wound about the same magnetic core or air core
Data Source
AI summary
The present disclosure relates to a wireless charging transmitter system and its control method. The system includes at least two transmit coils, configured to simultaneously transmit power; at least two transmit circuits, wherein each of the transmit circuits is electrically connected to each of the transmit coils, and is configured to supply a current to the transmit coil; and at least one decoupling circuit, wherein the decoupling circuit is connected to any two coupled transmit coils of the at least two transmit coils. By controlling N switches in a first compensation circuit and/or M switches in a second compensation circuit in the decoupling circuit, compensation capacitors connected in parallel with two terminals of a first inductor and a second inductor are controlled such that the equivalent mutual-inductance of the decoupling circuit may be adjusted to improve decoupling precision and reduce power loss caused by coupling between transmit coils.