Wireless Power Feeding System Dynamic Coupling Control
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Solution Overview
Problem
In wireless power feeding systems, existing technologies face challenges in maintaining maximum efficiency control when the relative positions of the power-transmission-side coil and the power-reception-side coil change, leading to potentially excessive input power due to varying coupling coefficients.
Innovation Solution
A wireless power feeding system that includes a power transmission circuit, a power-transmission-side coil, a power-reception-side coil, and control mechanisms to maintain constant input power and adjust reception voltage for maximum efficiency, using real-time calculations of the coupling coefficient to update voltage control settings and ensure stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If maximum efficiency control is performed by estimating coupling coefficient and controlling output voltage, then power transmission efficiency is improved, but input power becomes excessive when coupling coefficient is small
Solution Approach 1:
The patent implements dynamic control by making the control cycle adaptable to the settling time. The control cycle is set to be not less than the settling time, allowing the system to dynamically adjust based on the actual coupling coefficient and system response characteristics, preventing excessive input power while maintaining efficiency.
Solution Approach 2:
The patent uses feedback control by measuring the actual coupling coefficient and using it to adjust the output voltage. The control system continuously monitors the system state and adjusts the output voltage based on the measured coupling coefficient, ensuring optimal efficiency without excessive input power.
2Loss of energy
If output voltage is controlled to maintain maximum efficiency, then power transmission efficiency is improved, but system stability deteriorates when relative positions change
Solution Approach 1:
The patent implements dynamic control by making the control cycle adaptable to the settling time. The control cycle is set to be not less than the settling time, allowing the system to dynamically adjust based on the actual coupling coefficient and system response characteristics, preventing excessive input power while maintaining efficiency.
Solution Approach 2:
The patent changes the control parameter timing by setting the control cycle based on the settling time rather than using a fixed control frequency. This parameter adjustment allows the system to adapt to position changes while maintaining stability and efficiency.
3Speed
If control cycle is shortened to follow voltage variation, then response speed is improved, but control precision deteriorates due to insufficient settling time
Solution Approach 1:
The patent implements dynamic control by making the control cycle adaptable to the settling time. The control cycle is set to be not less than the settling time, allowing the system to dynamically adjust based on the actual coupling coefficient and system response characteristics, preventing excessive input power while maintaining efficiency.
Solution Approach 2:
The patent performs preliminary action by waiting for the settling time to elapse before updating the coupling coefficient measurement. This ensures that the system has reached a stable state before measurement, improving measurement precision while maintaining adequate response speed.
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 enables maximum efficiency control while preventing excessive input power, even when coil positions change, by dynamically adjusting voltage control based on real-time coupling coefficient measurements.
Implementation Method 1
a power-reception-side coil which is magnetically coupled with the power-transmission-side coil supplied with the AC power from the power transmission circuit portion, and to which AC power is transmitted from the power-transmission-side coil through magnetic energy accumulated between the power-reception-side coil and the power-transmission-side coil
Data Source
AI summary
A wireless power feeding system includes: a power transmission circuit portion for converting DC power supplied from a main power supply, to AC power, and for supplying the AC power to a power-transmission-side coil; input power control means for controlling the AC power to be supplied to the power-transmission-side coil; a power-reception-side coil which is magnetically coupled with the power-transmission-side coil and to which AC power is transmitted from the power-transmission-side coil through magnetic energy accumulated between the power-reception-side coil and the power-transmission-side coil; a power reception circuit including a rectifier for converting the AC power transmitted to the power-reception-side coil, to DC, and a power-reception-side DC/DC converter; and power reception circuit control means for controlling rectifier output voltage to be a maximum efficiency voltage at which power transmission efficiency becomes maximum.