Wireless Charging Receiver Current Feedback for Overcurrent Protection
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Solution Overview
Problem
The input current of the power converter in a wireless charging receive end is not controlled, leading to the potential for overcurrent, which can damage the power converter and reduce the reliability of the wireless charging system.
Innovation Solution
A wireless charging receive end with a controller that obtains a reference signal based on the input current of the power converter and sends it to the transmit end controller to adjust the input current, using operational amplifiers and software to prevent overcurrent and optimize charging parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the input current of the power converter is not controlled, then the wireless charging system is simpler to implement, but the power converter may suffer from overcurrent damage and system reliability deteriorates
Solution Approach 1:
The patent implements a feedback control mechanism where the receive end controller monitors the input current of the power converter and sends control signals to the transmit end controller to adjust the transmitting power. This closed-loop feedback system prevents overcurrent by continuously comparing actual current with reference values and adjusting the magnetic coupling between transmitter and receiver coils accordingly.
Solution Approach 2:
The patent introduces a receive end controller as an intermediary component that mediates between the power converter and the transmit end controller. This intermediary monitors current conditions and communicates with the transmit end to coordinate power transmission, thereby protecting the power converter without requiring direct complex control circuitry within the converter itself.
2Reliability
If current control mechanisms are added to the power converter, then overcurrent protection is improved, but the device complexity and cost increase
Solution Approach 1:
The receive end controller serves as an intermediary that performs current monitoring and control signal generation, eliminating the need for complex control circuits within the power converter itself. This intermediary approach distributes control functions across separate components, reducing individual component complexity while maintaining overall system protection capability.
Solution Approach 2:
The system implements self-service protection where the receive end controller autonomously monitors current conditions and automatically adjusts transmitting power through communication with the transmit end controller. This self-regulating mechanism provides overcurrent protection without requiring external intervention or complex manual control systems.
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 effectively prevents overcurrent at the power converter, enhancing the reliability and efficiency of the wireless charging system by controlling the input current and optimizing charging parameters.
Implementation Method 1
The receiver coil is configured to: convert an alternating magnetic field transmitted by a transmit end into an alternating current
Data Source
AI summary
A wireless charging receive end, system, and control method related to the field of wireless charging technologies are provided. The wireless charging receive end includes a receiver coil, a compensation network, a power converter, and a receive end controller. The receiver coil converts an alternating magnetic field transmitted by a transmit end into an alternating current and transmits the alternating current to the compensation network. The compensation network compensates for the alternating current and then transmit a compensated alternating current to the power converter. The power converter rectifies the compensated alternating current into a direct current for charging a load. The receive end controller obtains a reference signal based on an input current of the power converter and an input reference current, and sends the reference signal to a transmit end controller.