Non-contact Power Supply Frequency Parameter Optimization
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Solution Overview
Problem
Conventional noncontact power supply devices face challenges in maintaining high power transmission efficiency due to variations in component values during manufacturing, which can lead to deviations in drive frequency and resonance frequencies, affecting productivity and efficiency.
Innovation Solution
A noncontact power supply device design featuring a power transmission device with a power-transmission resonant circuit and a magnetism collecting device, where the power-transmission resonance frequency is set lower than the drive frequency, and the power-reception resonance frequency is set higher than the drive frequency, allowing for magnetic coupling without electrical connection to the load, thereby stabilizing power transmission and increasing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the drive frequency and resonance frequencies are precisely matched during manufacturing, then power transmission efficiency improves, but manufacturing complexity and time increase due to the need for precise frequency matching
Solution Approach 1:
The patent changes the frequency relationship parameter from traditional matching (drive frequency = resonance frequency) to a specific non-matching relationship (power-transmission resonance frequency < drive frequency < power-reception resonance frequency). This parameter change allows the system to achieve high power transmission efficiency without requiring precise frequency matching during manufacturing, thereby improving productivity while maintaining energy efficiency.
2Reliability
If element values are strictly controlled to prevent deviation from design values, then frequency matching improves, but manufacturing cost and complexity increase
Solution Approach 1:
The patent modifies the frequency relationship parameter to create a robust system that tolerates element value variations. By establishing the relationship where power-transmission resonance frequency is lower than drive frequency and power-reception resonance frequency is higher than drive frequency, the system maintains stable frequency matching and high reliability without requiring complex manufacturing controls.
3Stability of the object's composition
If the power-transmission resonance frequency is set lower than drive frequency and power-reception resonance frequency is set higher than drive frequency, then frequency stability against manufacturing variations improves, but traditional frequency matching optimization is compromised
Solution Approach 1:
The patent simultaneously optimizes multiple frequency parameters by establishing the relationship: power-transmission resonance frequency < drive frequency < power-reception resonance frequency. This coordinated parameter change achieves both frequency stability against manufacturing variations and high power transmission efficiency, resolving the apparent contradiction between stability and efficiency.
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 configuration enhances power transmission efficiency and productivity by eliminating the need for precise frequency matching, stabilizing operations, and reducing the impact of manufacturing variations, while maintaining high power transmission capabilities.
Implementation Method 1
a power-transmission resonant circuit that outputs an alternating magnetic flux by alternating power supplied from a power source circuit
Implementation Method 2
a magnetism collecting circuit configuring a magnetism-collecting resonant circuit which is capable of being magnetically coupled to the power-transmission resonant circuit and is not electrically connected to a load
Data Source
AI summary
A noncontact power supply device includes a power transmission device, a magnetism collecting device, and a power reception device. The power transmission device includes switching elements that make a power-transmission resonant circuit generate an alternating magnetic flux from a power source circuit. The power reception device includes a magnetism collecting device having a magnetism collecting circuit not connected to a load, a power receiving coil which is capable of being magnetically coupled to the magnetism collecting device, and a rectifier circuit that supplies output power of the power receiving coil to a load. A power-transmission resonance frequency of the power-transmission resonant circuit is smaller than a drive frequency of each of switching elements, and a power-reception resonance frequency of the magnetism collecting circuit is larger than the drive frequency of each of switching elements. Accordingly, the present invention provides a noncontact power supply device with high power transmission efficiency and with excellent productivity.