Wireless Power Feeder Efficiency Control
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Solution Overview
Problem
Existing wireless power transmission systems face efficiency declines due to changes in coil coupling, component quality, distance, and foreign material intrusion, leading to potential system failures and increased radiation, with existing solutions stopping power transmission when frequency profiles do not match, resulting in low robustness and increased costs.
Innovation Solution
A wireless power feeder with a control section that adjusts power supply to the power feed coil based on efficiency thresholds, stopping or reducing power when efficiency falls below certain reference values, and optimizing frequency and impedance to maintain transmission while minimizing losses and radiation, without requiring specific product settings or frequent frequency profiling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If power transmission is continued when efficiency declines, then productivity is maintained, but loss of energy increases and reliability deteriorates
Solution Approach 1:
The system dynamically adjusts power supply based on real-time efficiency monitoring. When efficiency falls below the first reference value, the control section reduces or stops power supply to prevent excessive energy loss. When efficiency recovers above the second reference value, power supply is restored. This dynamic adjustment resolves the contradiction by adapting productivity to actual transmission conditions.
Solution Approach 2:
The system implements a feedback mechanism where the control section continuously monitors power transmission efficiency and adjusts power supply accordingly. The feedback loop compares current efficiency against reference values and automatically modifies power supply state, enabling the system to maintain productivity when efficient while preventing energy waste when inefficient.
2Reliability
If frequency profiling and normal profile comparison are implemented, then reliability improves by detecting failures, but device complexity increases and loss of time occurs
Solution Approach 1:
The system monitors changes in power transmission efficiency as a simplified parameter indicator of system health. Instead of implementing complex frequency profiling and normal profile comparison, the control section detects efficiency deviations from expected ranges to identify potential failures. This parameter-based approach maintains reliability while significantly reducing system complexity.
3Reliability
If power supply is stopped when efficiency is low, then reliability is maintained, but productivity decreases due to unnecessary stoppages
Solution Approach 1:
The system applies partial action by implementing staged power supply control. Instead of binary stop/go decisions, the system uses two reference values to create intermediate states: normal power supply above the second reference value, reduced or stopped power supply below the first reference value, and a transition zone in between. This partial action approach maintains reliability by stopping power when truly necessary while preserving productivity by allowing continued operation in marginal conditions.
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
Enables continued power transmission with reduced inherent loss and radiation, improving robustness and reducing unnecessary stoppages, while avoiding costly frequency profiling and component-specific settings, thus enhancing operational reliability and user convenience.
Implementation Method 1
power feed coil to perform power feed from the power feed coil to the power receive coil on the basis of a magnetic coupling between the power feed coil and the power receive coil
Implementation Method 2
wireless power transmission system which transmits power by a non-contact (wireless) method from a wireless power feeder to a wireless power receiver utilizing a magnetic field resonance effect
Data Source
AI summary
A wireless power feeder has a power feed coil that performs a power feed by a non-contact method to a wireless power receiver having a power receive coil. A power source section supplies AC power to the power feed coil. A control section calculates a power transmission efficiency from the power feed coil to the power receive coil to control a power source section so that the power supply to the power feed coil is in a stopped or intermittent state when the power transmission efficiency is lower than a first determination reference value; is in a first power supply state when the power transmission efficiency is equal to or higher than the first determination reference value and lower than a larger second determination reference value; and is in a second power supply state when the power transmission efficiency is equal to or higher than the second determination reference value.