Microvaristor-based overvoltage protection
US8097186B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 3, 2009 |
| Grant date | Jan 17, 2012 |
| Priority date | — |
| Expiry date | Oct 25, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01C7/112
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method is disclosed for producing a non-linear powder having microvaristor particles which have a non-linear current-voltage characteristic. The production steps includes mixing non-metallic particles with the microvaristor particles, thermally treating the non-metallic particles for decomposing them into electrically conductive particles and fusing the electrically conductive particles onto the microvaristor particles. Embodiments, among other things, relate to: breaking up agglomerates of the non-metallic particles during mixing; keeping the decomposition temperature below a sintering or calcination temperature of the microvaristor particles; and choosing micron-sized or nano-sized non-conductive particles for microvaristor decoration. The production method produces varistor powder with improved reproducibility of the non-linear electric current-voltage characterstic and with reduced switching fields (Es).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.