Piezoelectric Transformer Electrode Spacing for Flashover Prevention
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Solution Overview
Problem
Piezoelectric transformers face challenges with high voltage flashover between electrodes and reduced efficiency due to insulation requirements, particularly in low power ranges, where enlarging insulating regions compromises transformer efficiency.
Innovation Solution
A piezoelectric component with a rectangular-parallelepipedal base body and strategically positioned primary and secondary electrodes, which are farther apart in certain regions to increase insulating distances, ensuring higher flashover voltage while maintaining efficiency through extended electrode coverage and multilayer structure design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If insulating regions are enlarged to prevent voltage flashover between electrodes, then insulation performance is improved, but transformer efficiency decreases
Solution Approach 1:
The patent applies local quality by creating asymmetric insulating regions with different distances from longitudinal side faces in different partial regions. The first primary electrode has a first distance in a first partial region and a second distance in a second partial region, where these distances differ. This allows optimized insulation performance in specific critical areas without unnecessarily enlarging insulating regions throughout the entire electrode structure, thereby maintaining transformer efficiency while preventing voltage flashover where it matters most.
2Power
If electrodes are positioned closer to longitudinal side faces to maximize active area, then transformer efficiency is improved, but flashover voltage between input and output regions decreases
Solution Approach 1:
The patent implements local quality by varying the distance between electrodes and longitudinal side faces across different partial regions. In regions where flashover risk is high, larger distances are maintained to ensure insulation performance. In other regions, electrodes can be positioned closer to maximize active area and efficiency. This spatially differentiated approach allows the transformer to achieve both high efficiency and adequate flashover voltage protection.
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 solution significantly increases flashover voltage and efficiency by creating larger insulating regions between the input and output regions, allowing for effective mechanical-to-electrical energy conversion while being producible using conventional multilayer technologies.
Implementation Method 1
The coupling coefficient KIJ is a measure of the effectiveness of the conversion of electrical energy into mechanical energy, and vice versa
Implementation Method 2
The coupling coefficient KIJ is a measure of the effectiveness of the conversion of electrical energy into mechanical energy, and vice versa
Data Source
AI summary
A piezoelectric component comprises a parallelepipedal basic body made of piezoelectric material which has an input region and an output region at opposite longitudinal ends of the basic body. Furthermore, the piezoelectric component comprises first and second primary electrodes which are arranged inside the input region and first and second secondary electrodes which are arranged inside the output region. The primary electrodes are at a greater interval from longitudinal lateral faces of the basic body in a subregion which faces the output region than in the subregion which is remote from the output region. Likewise, the secondary electrodes are at a greater interval from the longitudinal lateral faces of the basic body in a subregion which faces the input region than in a subregion which is remote from the input region.