Wireless Power Receiving Unit Load Modulation Feedback Control
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Solution Overview
Problem
Existing wireless power feeding systems face challenges in preventing excessive voltage occurrences in electronic devices during charging, which can affect reliability and safety.
Innovation Solution
A power receiving unit with a power generation section and a communication section that generates direct-current power and sets the load based on the output current, allowing for load modulation to communicate with the power feeding unit and adjust feed power, thereby reducing the risk of excessive voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If wireless power feeding is performed using electromagnetic induction method, then power transfer efficiency is improved, but excessive voltage may occur in the power receiving unit
Solution Approach 1:
The communication section establishes bidirectional communication between the power receiving unit and power feeding unit. The power receiving unit transmits reception status information (including output current levels) to the power feeding unit, which uses this feedback to adjust the power signal output dynamically, preventing excessive voltage while maintaining efficient power transfer
Solution Approach 2:
The system dynamically adjusts the power signal characteristics based on real-time operating conditions. The power feeding unit modifies the power signal output according to the reception status feedback, and the power receiving unit adjusts its load modulation characteristics based on output current levels, enabling adaptive control that prevents excessive voltage during high-efficiency power transfer
2Ease of operation
If load modulation is used for communication to adjust feed power, then power feeding control is improved, but complex communication control is required
Solution Approach 1:
The communication section combines power reception and communication functions into a unified system. The same power receiving coil that captures power also serves as the communication interface through load modulation, eliminating the need for separate communication hardware and simplifying the overall device structure while maintaining effective power feeding control
3Productivity
If the power receiving unit operates at high power levels, then charging speed is improved, but excessive voltage risk increases
Solution Approach 1:
The system continuously monitors output current levels and transmits this information to the power feeding unit. When high power levels are detected that could lead to excessive voltage, the feedback mechanism triggers automatic reduction of the power signal output, enabling fast charging while maintaining safety through real-time monitoring and adjustment
Solution Approach 2:
The communication section establishes communication links and transmission rules before high-power charging begins. By pre-configuring the feedback mechanism and communication protocols, the system is prepared to immediately respond to conditions that could cause excessive voltage, preventing the problem before it occurs rather than reacting after damage happens
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 reduces the risk of excessive voltage occurrences, ensuring stable and reliable charging of electronic devices while maintaining efficient power transfer.
Implementation Method 1
power is transmitted utilizing magnetic coupling between a power feeding coil of a power feeding unit and a power receiving coil of a power receiving unit. Among them, the electromagnetic induction method has an advantage of being able to enhance the degree of coupling between the power feeding coil and the power receiving coil
Implementation Method 2
communications by means of so-called load modulation are often performed prior to the power feeding to adjust the feed power
Data Source
AI summary
A power receiving unit of the disclosure includes: a power generation section configured to generate direct-current power, based on a power signal supplied wirelessly from a power feeding unit; and a communication section configured to set a load of the power signal in accordance with an output current of the power generation section, and to communicate with the power feeding unit by modulating the load.