Which type of the capacitor should be used in a 1000V power supply?

• Mica capacitors are available in the range between a few pF to thousand pF with voltage rating in between few hundred volts to thousand volts
• Mica capacitors are low loss capacitors which are used where the high frequency is required, and their value doesn’t change much over time
• The capacitance of mica capacitors ranges from 10 pF to 5000 pF

Important:

Applications for Mica Capacitors

• Ripple filter and Decoupling for general electronic devices
• Resonant circuits
• Coupling circuits
• Time constant circuits
• High-power RF broadcast transmitters
• Defence Electronic Devices
• Power transfer circuits for low-capacitance snubber applications
• Radio or TV transmitters
• Cable TV amplifiers
• High voltage inverter circuits

Paper capacitor:

Paper capacitors usually range in value from about 300 picofarads to about 4 microfarads. The working voltage of a paper capacitor is up to 600 volts.

Air capacitor:

• These are simplest variable non-polarized capacitors
• The capacitance of the air capacitor is small, about 100 pF to 1 nF
• Air capacitors use air as a dielectric in two conductive plates
• The dielectric strength of air is inferior to many other materials, which makes air capacitors unsuitable for high voltages

Electrolyte capacitor:

• These capacitors are polarized; hence they are mostly used in circuits where both AC and DC signals are used
• They have low working voltage between 1.5 V to 40 V