Introduction to Vacuum Capacitors

Introduction to Vacuum Capacitors

Definition: A vacuum capacitor is a capacitor with vacuum as its medium. The electrode group of this capacitor is a group of concentric cylindrical electrodes formed by extending high-conductivity oxygen-free copper strips through a set of high-precision molds one by one and sealed in a vacuum container. Therefore, its performance is stable and reliable, and it is not easy to produce arcing, corona and other phenomena.

Performance: Compared with other dielectric capacitors, vacuum capacitors have the characteristics of high withstand voltage, small volume, low loss, stable and reliable performance, etc. The uniqueness has the following aspects: Rated voltage - Due to the high insulation strength of vacuum, coupled with the characteristics of dust pollution and moisture resistance, vacuum capacitors have a large rated voltage value for a certain size and capacity. High up to hundreds of thousands of volts. Small loss, large rated current - Because the capacitor adopts vacuum medium, low loss insulating shell and oxygen-free copper electrode structure, it can pass a large radio frequency current even at high frequency under general convection cooling conditions. If a special water cooling structure is used, the radio frequency current can reach thousands of amperes. Space saving—vacuum capacitors take up little space for a given capacitance and voltage rating. Wide adjustment range - the ratio of high capacity to small capacity is as high as 150:1, from a few picofarads to thousands of picofarads, making it an ideal component for a wide tuning range. Self-healing against overvoltages—Vacuum capacitors can withstand momentary overvoltages that would cause permanent damage to other capacitors. High Altitude Capability—Vacuum sealing allows vacuum capacitors to operate at high altitudes without degrading their characteristics.

Applications: 1) Broadcasting and communication equipment: Vacuum capacitors are used as components for tuning, coupling, filtering, neutralization, and DC blocking on medium-wave, short-wave, and ultra-short-wave transmitters. 2) Semiconductor manufacturing equipment: used for plasma deposition and etching equipment 3) High-frequency industrial equipment: used for high-frequency dielectric heating and welding, etc. 4) Medical equipment: medical analyzers and therapeutic instruments, etc. 5) High-energy physics: high-energy Particle accelerators, etc. 6) Power equipment: used for dielectric loss test equipment.