Vacuum Capacitor Brazing Structure for High-Frequency Heat Reduction
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Solution Overview
Problem
Conventional vacuum capacitors experience significant temperature rise due to heat generation caused by high frequency dielectric polarization, hysteresis loss, and eddy current loss, especially in energized parts, leading to performance degradation and potential failure.
Innovation Solution
A brazing structure using AgCuTi-based, AgCuInTi-based, or AgCuSnTi-based active metal brazing to join ceramic pipes with electrodes, combined with field-relaxing rings and high-purity alumina ceramic, disperses electric and magnetic fields to reduce heat generation and maintain performance without increasing part size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If nickel plating is used to metallize the ceramic pipe, then wettability for brazing is achieved, but heat generation increases due to ferromagnetic hysteresis loss and eddy current loss
Solution Approach 1:
The patent extracts the ferromagnetic nickel plating layer that causes hysteresis loss and eddy current loss, replacing it with a non-magnetic or weakly magnetic metal plating layer. This removes the harmful magnetic properties while maintaining the necessary brazing functionality through proper surface preparation and alternative plating materials.
Solution Approach 2:
The patent changes the magnetic parameter of the plating layer from ferromagnetic (nickel) to non-magnetic or weakly magnetic materials. This parameter change eliminates hysteresis loss and reduces eddy current loss, thereby reducing heat generation in the ceramic pipe while maintaining electrical conductivity and brazing capability.
2Power
If high frequency voltage is increased to increase high frequency current, then power transmission capability is improved, but heat generation in the ceramic pipe increases due to dielectric polarization
Solution Approach 1:
The patent converts the harmful concentrated electric field into a beneficial dispersed electric field distribution by optimizing the electrode configuration and spacing. This dispersal reduces dielectric polarization loss in the ceramic pipe while maintaining the required power transmission capability through improved field utilization.
3Power
If electric field intensity is concentrated in a particular part to achieve high voltage breakdown, then voltage handling capability is improved, but heat generation in that particular part increases
Solution Approach 1:
The patent applies local quality optimization by creating specific geometric features at critical locations where electric field concentration is needed for voltage breakdown, while maintaining field dispersal in other regions. This localized field enhancement achieves voltage handling capability without causing excessive heat generation in any single area.
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 effectively reduces heat generation and temperature rise in energized parts, improving the vacuum capacitor's performance and reliability by minimizing hysteresis and eddy current losses, while allowing for arbitrary capacitance adjustment.
Implementation Method 1
a first end of the ceramic pipe being joined to the conductor by active metal brazing with use of an AgCuTi-based, AgCuInTi-based, or AgCuSnTi-based metal
Implementation Method 2
Each of the nickel plating coats at the first and second ends of the ceramic pipe 2 metallized by nickel plating is a ferromagnet, and forms a ferromagnet magnetic passage
Implementation Method 3
causes the annular ferromagnet magnetic passages made of nickel to generate heat due to hysteresis loss and eddy current loss
Implementation Method 4
causes the annular ferromagnet magnetic passages made of nickel to generate heat due to hysteresis loss and eddy current loss
Implementation Method 5
the ceramic pipe 2 undergoes heat generation due to high frequency dielectric polarization
Data Source
AI summary
A brazing structure for a vacuum container is provided. The vacuum container includes: a fixed conductor on which a fixed electrode is supported; a movable conductor on which a movable electrode is supported; a flange pipe which is bonded to the movable conductor coaxially with the fixed electrode and the movable electrode; and a ceramic pipe which is provided coaxially therewith. One end of the ceramic pipe is bonded to the fixed conductor by brazing, with a linking flange pipe therebetween, and the other end thereof is bonded to the flange pipe by brazing, with a linking flange pipe therebetween. The linking flange pipe includes a bonding portion that is bonded to the ceramic pipe by active metal brazing using an AgCuTi-based, AgCuInTi-based, or AgCuSnTi-based metal.