Temperature-Compensating Capacitor for Stable Wireless Power Transfer
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Solution Overview
Problem
In wireless power transfer systems, temperature fluctuations cause changes in the permittivity of dielectric materials within LC circuits, leading to variations in resonant frequency, which reduce efficiency and increase losses.
Innovation Solution
The use of a first capacitor with dielectric material having permittivity inversely proportional to temperature and a second capacitor with dielectric material having permittivity directly proportional to temperature, connected in series or parallel, maintains constant capacitance and resonant frequency despite temperature changes, often achieved through specific electrode and dielectric layer configurations in ceramic capacitors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional capacitor with fixed permittivity dielectric material is used, then the circuit is simple to manufacture, but the resonant frequency varies with temperature changes
Solution Approach 1:
The patent combines two capacitors with different dielectric materials into a single integrated component. The first capacitor uses a dielectric material with positive temperature coefficient while the second capacitor uses a dielectric material with negative temperature coefficient, merging them to achieve temperature compensation and stable resonant frequency across temperature variations.
Solution Approach 2:
The patent employs composite dielectric materials with opposing temperature characteristics. The first dielectric material has permittivity that increases with temperature, while the second dielectric material has permittivity that decreases with temperature, creating a composite capacitor system that compensates for temperature-induced frequency drift.
2Reliability
If temperature compensation is implemented using multiple dielectric materials, then resonant frequency stability improves, but manufacturing complexity increases
Solution Approach 1:
The patent merges two temperature-compensating capacitors into a single integrated component with shared external electrodes, reducing the number of discrete parts and simplifying assembly while maintaining the temperature compensation functionality through carefully designed internal electrode connections.
3Productivity
If the resonant frequency varies with temperature, then wireless power transfer efficiency decreases, but implementing temperature compensation increases device complexity
Solution Approach 1:
The patent changes the electrical parameters of the capacitor system by using dielectric materials with opposite temperature coefficients. This parameter change enables the total capacitance to remain relatively constant across temperature variations, thereby stabilizing the resonant frequency and maintaining wireless power transfer efficiency without adding external control systems.
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 stabilizes the resonant frequency of LC circuits, enhancing wireless power transfer efficiency and reducing losses by compensating for temperature-induced capacitance variations.
Implementation Method 1
a first capacitor including a first dielectric material having a permittivity that is inversely proportional to temperature; and a second capacitor connected in series with the first capacitor and including a second dielectric material having a permittivity that is directly proportional to temperature
Data Source
AI summary
An electronic component includes a first capacitor including a first dielectric material having a permittivity that is inversely proportional to temperature; and a second capacitor connected in parallel with the first capacitor and including a second dielectric material having a permittivity that is directly proportional to temperature.