Capacitance Discharge Ignition System

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SUMMARY

The forum discussion centers on the construction of a Capacitance Discharge Ignition (CDI) system for igniting fuel mixtures in a pressure chamber. The user requires a capacitor rated at approximately 5 nF and capable of withstanding 10 kV, along with a high-voltage rectifier diode and high-voltage relays. Another participant clarifies that typical CDI systems utilize a spark coil to generate high voltage, suggesting that components only need to be rated for about 600V instead of the initially requested 10 kV.

PREREQUISITES
  • Understanding of Capacitance Discharge Ignition (CDI) systems
  • Knowledge of high-voltage components and their ratings
  • Familiarity with spark coil operation and voltage generation
  • Basic electronics principles related to capacitors and diodes
NEXT STEPS
  • Research high-voltage capacitor specifications and suppliers for 5 nF, 10 kV capacitors
  • Explore options for high-voltage rectifier diodes rated for at least 10 kV
  • Investigate high-voltage relay specifications and sourcing
  • Learn about the operation and characteristics of spark coils in CDI systems
USEFUL FOR

Electronics enthusiasts, engineers designing ignition systems, and anyone involved in high-voltage applications will benefit from this discussion.

jaap de vries
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Dear friends,

I am building a CDI system to ignite fuel mixtures in a pressure chamber for flame speed measurements.
I need a capacitor of about 5 nF, but it should hold up to 10 kV.
Any suggestions on where I can get those. I also need a diode (rectifier) for 10 kV. Also I need high voltage relays.



Jaap
 

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Engineering news on Phys.org
Ummmm.
Where are you getting you component values from?

Normal CDI, the spark coil generates the HV (10Kv to 30Kv).
With a standard spark coil 100v to 350v on C of 1uf should give about that output range.
So your diodes and relays only have to rated for about 600v.
 

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