Wireless Power Inverter Turn-On Current Control
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Solution Overview
Problem
Existing wireless power transmission systems face challenges in reliably suppressing turn-on currents in inverters, which lead to increased heat generation and potential overheating, due to the need for pre-prepared maps that are costly and time-consuming to create, and are affected by temperature variations.
Innovation Solution
A wireless power transmission device with a controller that dynamically adjusts the frequency of transmission power to control turn-on currents by determining the direction of frequency manipulation based on the variation of turn-on currents, incorporating processing for power control and efficiency optimization to minimize turn-on currents and protect the inverter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a map showing relation among coefficient of coupling, frequency, and current phase is prepared in advance, then the turn-on current can be suppressed, but many man-hours and much cost are required for generating the map
Solution Approach 1:
The system performs self-calibration by automatically generating the frequency manipulation map through its own operation. The controller varies the frequency, measures the resulting turn-on current, and stores the relationship data without requiring external experimental setup or manual intervention, thereby eliminating the time and cost of pre-generation
Solution Approach 2:
The system implements feedback control by measuring the actual turn-on current during operation and using this information to adjust the frequency manipulation strategy. The controller continuously refines the frequency-turn-on current relationship through real-time measurements and updates the manipulation map accordingly
2Reliability
If a map showing relation among coefficient of coupling, frequency, and current phase is prepared in advance, then the turn-on current can be suppressed, but much cost is required for generating the map
Solution Approach 1:
The system generates its own calibration data through self-operation, eliminating the need for expensive external experimental facilities or third-party testing. The controller utilizes the system's existing components to perform frequency variation and turn-on current measurement, converting the calibration process into a routine operational function that incurs minimal additional cost
3Reliability
If frequency manipulation is based on pre-prepared map, then turn-on current can be suppressed, but relation between frequency and phase may be affected by temperature making manipulation direction incorrect
Solution Approach 1:
The system transitions from using a static pre-prepared map to a dynamic frequency manipulation approach. The controller continuously adapts the frequency adjustment strategy based on real-time temperature conditions and actual turn-on current measurements, allowing the system to respond to environmental changes rather than relying on fixed calibration data
Solution Approach 2:
The system implements real-time feedback control where the controller measures the actual turn-on current under current temperature conditions and adjusts the frequency manipulation accordingly. This closed-loop control ensures that the manipulation direction remains correct despite temperature variations affecting the frequency-phase relationship
Data Source
AI summary
An inverter generates transmission power at a prescribed frequency and supplies transmission power to a power transmitter. A power supply ECU is configured to carry out turn-on current control for controlling a turn-on current to a restriction value or less by manipulating a frequency of transmission power by means of the inverter. Turn-on current control includes first processing for determining a direction of manipulation of the frequency for lowering the turn-on current based on a direction of variation in turn-on current at the time when the frequency is varied.