Piezoelectric Transformer with Pressurizing Mechanism for Heat Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Piezoelectric transformers with high power output suffer from vibration transmission losses and heat generation at interfaces, leading to reduced power conversion efficiency and temperature rises, which hinder downsizing and high integration in electronic devices.
Innovation Solution
A piezoelectric transformer design featuring a laminate structure with a pressurizing mechanism that minimizes heat generation by optimizing the ratio of electromechanical coupling coefficients k33/k31 and k31, reducing frictional losses, and using lead-free perovskite-type metal oxides to enhance power conversion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a piezoelectric transformer is designed for high power output, then power conversion capability is improved, but vibration transmission losses and heat generation at interfaces increase
Solution Approach 1:
The patent applies parameter changes by optimizing the electromechanical coupling coefficients (k33/k31 ratio ≥ 2.0) of the piezoelectric elements, changing the physical parameters of the piezoelectric material to achieve high power output while minimizing vibration transmission losses and heat generation at interfaces
2Power
If a piezoelectric transformer is designed for high power output, then power conversion capability is improved, but heat generation at interfaces increases
Solution Approach 1:
The patent changes the physical parameters by selecting piezoelectric materials with optimized electromechanical coupling coefficients (k33/k31 ratio ≥ 2.0), which reduces the conversion loss and consequently decreases heat generation and temperature rise at the interfaces during high power operation
Solution Approach 2:
The patent converts the potentially harmful vibration energy that would be lost at interfaces into useful output power by optimizing the piezoelectric coupling characteristics, thereby reducing waste heat generation while maintaining high power output capability
3Power
If a piezoelectric transformer is designed for high power output, then power conversion capability is improved, but power conversion efficiency decreases
Solution Approach 1:
The patent achieves high power conversion efficiency while maintaining high power output by changing the key parameter of electromechanical coupling coefficient ratio (k33/k31 ≥ 2.0) of the piezoelectric elements, which optimizes the energy conversion process and minimizes 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
The design achieves high power conversion efficiency with reduced heat generation and improved durability, enabling efficient vibration energy transformation and downsizing of electronic devices.
Implementation Method 1
the electric energy is transformed into elastic energy by the reverse piezoelectric effect of the piezoelectric ceramics of the input section
Implementation Method 2
transformed back into electric energy by the direct piezoelectric effect of the piezoelectric ceramics of the output section
Data Source
AI summary
A piezoelectric transformer comprises at least a laminate of a first member, a first piezoelectric element, a second piezoelectric element and a second member sequentially stacked one on the other in the above-listed order and a pressurizing mechanism for squeezing the first member and the second member together in the stacking direction. The ratio of the electromechanical coupling coefficient k33 relative to the electromechanical coupling coefficient k31 (k33/k31) of the first piezoelectric element and the second piezoelectric element is not less than 2.0.