Adaptive Wireless Charging Receiver Load Control
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Solution Overview
Problem
Wireless charging efficiency is hindered by factors such as coil misalignment, separation, and interference, leading to reduced energy transfer and potential charging failure, especially when the charging receiver coil is outside the effective working volume or misaligned with the transmitter coil.
Innovation Solution
A charging receiver device equipped with a received power monitoring circuit and a setpoint adapter circuit that adjusts the output charge current based on the rectified receiver voltage, ensuring it aligns with a target voltage by decreasing or increasing the power draw to maintain efficient energy transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the charging receiver coil is positioned outside the effective working volume or misaligned with the transmitter coil, then wireless charging efficiency deteriorates, but the device should still be able to charge
Solution Approach 1:
The patent applies dynamics by making the receiver load adjustable rather than fixed. The receiver control circuit dynamically changes the load impedance based on feedback about the coupling condition between transmitter and receiver coils. When coupling is poor (coils misaligned or separated), the circuit adjusts the load to maintain optimal power transfer, enabling charging to continue reliably even when coils are not perfectly positioned.
Solution Approach 2:
The patent implements feedback through a control circuit that monitors the power transfer condition between transmitter and receiver coils. The receiver control circuit receives feedback information about the coupling status and uses this information to adjust the receiver load accordingly. This closed-loop feedback mechanism allows the system to adapt to changing alignment conditions and maintain reliable charging despite misalignment or separation.
2Productivity
If the receiver load is fixed, then the device complexity is reduced, but the charging efficiency cannot be optimized under varying coupling conditions
Solution Approach 1:
The patent transforms the static receiver load into a dynamic, adjustable parameter. The receiver control circuit includes components that can vary the load impedance based on real-time coupling conditions. This dynamic adjustment capability optimizes charging efficiency across different alignment scenarios while adding only moderate complexity through integrated control circuitry.
Solution Approach 2:
The patent changes the electrical parameter (load impedance) of the receiver circuit based on operating conditions. By varying the load parameter in response to coupling quality, the system optimizes power transfer efficiency. This parameter adjustment is achieved through control circuits that modify receiver impedance, allowing efficient charging across a range of transmitter-receiver configurations.
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
The solution enhances wireless charging efficiency by dynamically adjusting the charge current to maintain optimal power transfer, even when the coils are misaligned or separated, thereby preventing charging failure and ensuring effective charging.
Implementation Method 1
Inductive charging uses an electromagnetic field to transfer energy from a first device to a second device. Electromagnetic induction can send energy from a charging transmitter of the first device through an inductive coupling to a charging receiver of the second device
Data Source
AI summary
A charging receiver device adapts wireless charging receiver loading. The charging receiver device receives energy wirelessly transferred from a wireless charging coil of a charging transmitter device. The charging receiver device includes a charger circuit electrically coupled to a wireless charging receiver coil to receive the charging power. The charging power is a function of a rectified receiver voltage at the charger circuit. A received power monitoring circuit monitors the rectified receiver voltage at the charger circuit, detects a deviation of the monitored rectified receiver voltage from a target rectified receiver voltage for the charging receiver device, and decreases a charge current output from the charger circuit to increase the rectified receiver voltage toward the target rectified receiver voltage, responsive to determining that the detected deviation indicates that the monitored rectified receiver voltage is less than the target rectified receiver voltage.