Contactless Power Feeding Voltage Control for Efficiency
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Solution Overview
Problem
Contactless power feeding systems face increased power consumption for non-power feeding operations due to resistance losses when maximizing power efficiency, leading to inefficiencies and heat generation.
Innovation Solution
A contactless power feeding apparatus with a power source capable of changing voltage, a power feeding coil generating a magnetic field, and a control portion that adjusts voltage based on the coupling coefficient between the coils to maximize efficiency without increasing resistance, including communication for feedback control and resonance components to optimize power transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the resistance value of the power feeding coil is increased to maximize power transmission efficiency, then power transmission efficiency is improved, but power consumption for other than power feeding increases due to resistance losses
Solution Approach 1:
The patent changes the control parameter from resistance value to feeding voltage value. The power feeding apparatus side control portion performs feeding voltage control to adjust the feeding voltage value based on the coupling coefficient, thereby maximizing power transmission efficiency without increasing the resistance value of the power feeding coil. This resolves the contradiction by finding an alternative parameter (voltage) to control efficiency that does not cause resistive power losses.
Solution Approach 2:
The patent implements feedback control where the power feeding apparatus side control portion acquires the coupling coefficient (which includes distance information) and uses it to dynamically adjust the feeding voltage value. This feedback mechanism allows the system to maintain optimal power transmission efficiency while avoiding unnecessary resistance increases that would cause power consumption losses.
2Loss of energy
If the feeding voltage value is increased to maintain power transmission efficiency over distance, then power transmission efficiency is improved, but power consumption increases
Solution Approach 1:
The patent makes the feeding voltage value dynamic by continuously adjusting it based on the real-time coupling coefficient. The power feeding apparatus side control portion performs feeding voltage control to optimize the voltage level according to the actual transmission conditions and distance, rather than using a fixed high voltage. This dynamic adjustment maintains power transmission efficiency while minimizing power consumption.
Solution Approach 2:
The patent changes the control approach from fixed resistance value to dynamic feeding voltage value based on coupling coefficient. This parameter change allows the system to adapt the voltage level to the actual transmission needs, maintaining efficiency without excessive power consumption.
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 approach suppresses power consumption for non-power feeding operations, maintains high power transmission efficiency regardless of distance, and reduces heat generation by dynamically controlling voltage based on coupling coefficients and load conditions.
Implementation Method 1
a power feeding coil generating a power feeding magnetic field by supply of an AC thereto from the power source portion
Implementation Method 2
a coupling coefficient between the power feeding coil and a power receiving coil provided outside, receiving electric power through the power feeding magnetic field of the power feeding coil
Data Source
AI summary
A contactless power feeding apparatus includes a power source portion, a power feeding coil, and a power feeding apparatus side control portion, and the power feeding apparatus side control portion is configured to perform feeding voltage control in order to control the feeding voltage value of the power source portion on the basis of a coupling coefficient such that power transmission efficiency to a power receiving apparatus including a power receiving coil is in the vicinity of a maximum.