Electronic Unit Voltage Reduction Control for Wireless Power
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Solution Overview
Problem
Noncontact power feeding systems face challenges in controlling voltage during power transmission, particularly when transitioning from preliminary to main power feeding, which can result in excessively high received voltages, potentially damaging electronic units.
Innovation Solution
Incorporating a voltage detection section and a control section in the electronic unit, which performs voltage reduction control using a dummy load circuit to decrease the received voltage to a predetermined threshold, preventing excessive voltage during main power feeding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If main power feeding is performed at high power from the beginning, then power transmission efficiency is improved, but received voltage becomes excessively high which may damage the electronic unit
Solution Approach 1:
The system performs preliminary power feeding at a lower power level before transitioning to main power feeding. This preliminary action allows the electronic unit to initialize its voltage detection and control sections, ensuring they are ready to handle the higher voltage that will follow during main power feeding, thus preventing damage from excessive voltage
Solution Approach 2:
The power feeding system dynamically adjusts the power level based on the operational stage. It transitions from a lower power level during preliminary feeding to a higher power level during main feeding, with real-time voltage detection and control to maintain safety while maximizing transmission efficiency
2Device complexity
If voltage reduction control is not performed during preliminary power feeding, then device complexity is reduced, but received voltage may still exceed safe thresholds during main power feeding
Solution Approach 1:
The voltage detection section continuously monitors the received voltage and provides feedback to the control section. Based on this feedback, the control section adjusts the power feeding level to maintain voltage within safe thresholds, ensuring reliability without requiring overly complex control circuits
Solution Approach 2:
The control section acts as an intermediary between the power feeding unit and the electronic unit. It receives voltage detection information and mediates the power transmission by adjusting the feeding level, thereby protecting the electronic unit from excessive voltage while maintaining system reliability
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 solution effectively prevents overvoltage in electronic units by reducing the received voltage during preliminary power feeding, ensuring safe and appropriate power control during subsequent main power feeding, thereby reducing the risk of damage and improving system efficiency.
Implementation Method 1
an electricity reception section configured to receive power fed from a power feeding unit using a magnetic field
Data Source
AI summary
An electronic unit includes: an electricity reception section configured to receive power fed from a power feeding unit using a magnetic field; a voltage detection section configured to detect a received voltage supplied from the electricity reception section; and a control section, wherein while preliminary power feeding at a lower power than main power feeding is performed from the power feeding unit, and when a received voltage detected by the voltage detection section is equal to or higher than a predetermined threshold voltage, the control section performs voltage reduction control so as to decrease the received voltage to lower than the threshold voltage.