Contactless Power Transfer Circuit With Immittance Tuning
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Solution Overview
Problem
Existing contactless power transmission systems face inefficiencies due to imbalanced characteristic impedance and impedance on the power transmission resonance circuit side, leading to increased harmonic components and reduced power transmission efficiency.
Innovation Solution
The system adjusts the ratio of characteristic impedance of the immittance conversion circuit to impedance on the power transmission and reception sides to minimize harmonic components, using inverter circuits and immittance conversion circuits to convert and adjust alternating-current power, thereby reducing losses and improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the characteristic impedance of the immittance conversion circuit is not adjusted relative to the impedance on the power transmission resonance circuit side, then the circuit structure remains simple, but harmonic components in the alternating-current power increase and power transmission efficiency decreases
Solution Approach 1:
The patent adjusts the characteristic impedance of the immittance conversion circuit by modifying circuit parameters (such as inductance and capacitance values) to achieve impedance matching with the power transmission resonance circuit. This parameter optimization reduces harmonic components and minimizes energy losses in the inverter circuit while maintaining a relatively simple circuit structure.
2Productivity
If the ratio of characteristic impedance to impedance on the power transmission resonance circuit side is adjusted to minimize harmonic components, then power transmission efficiency improves, but the design and tuning process becomes more complex
Solution Approach 1:
The patent optimizes the ratio between the characteristic impedance of the immittance conversion circuit and the impedance on the power transmission resonance circuit side by adjusting circuit parameters. This precise parameter tuning minimizes harmonic components in the alternating-current power, thereby improving power transmission efficiency and reducing energy losses.
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 adjustment significantly reduces harmonic components in the alternating-current power, lowering inverter circuit losses and enhancing the overall efficiency of power transmission to vehicles equipped with contactless power reception devices.
Implementation Method 1
an inverter circuit that converts the direct-current power of the power source circuit into alternating-current power
Implementation Method 2
a power transmission resonance circuit; a power reception resonance circuit that receives the alternating-current power from the power transmission resonance circuit in a contactless manner
Implementation Method 3
a rectification circuit that converts the alternating-current power input from the power reception-side immittance conversion circuit into direct-current power
Data Source
AI summary
A contactless power supply device that supplies electric power to a vehicle in a contactless manner, includes: a power transmission resonance circuit; a power source circuit supplying direct-current power; and a power transmission circuit converting the direct-current power of the power source circuit into alternating-current power and supplying alternating-current power to the power transmission resonance circuit. The power transmission circuit includes: an inverter circuit converting the direct-current power of the power source circuit into alternating-current power; and a power transmission-side immittance conversion circuit adjusting the alternating-current power of the inverter circuit and supplies the adjusted alternating-current power to the power transmission resonance circuit. The ratio of a characteristic impedance of the power transmission-side immittance conversion circuit to an impedance backward on the power transmission resonance circuit side from the power transmission-side immittance conversion circuit is adjusted such that harmonic components in the alternating-current power of the inverter circuit becomes lessened.