Capacitor Charging Circuit Question

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SUMMARY

The discussion centers on the operation of high voltage (HV) boost converter chargers used for charging capacitors. Participants explain that these chargers typically utilize an LED indicator to signal when the capacitor is fully charged. The mechanism involves monitoring the voltage across the capacitor, and once it reaches a predetermined threshold, the charger either disconnects the capacitor from the circuit or shuts off the charging circuit entirely. The use of operational amplifiers (op-amps) is suggested as a simpler alternative for implementing this functionality.

PREREQUISITES
  • Understanding of capacitor charging principles
  • Knowledge of high voltage boost converter circuits
  • Familiarity with LED indicators in electronic circuits
  • Basic concepts of operational amplifiers (op-amps)
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  • Research the operation of high voltage boost converters
  • Learn about voltage sensing techniques for capacitors
  • Explore the design and application of op-amps in charging circuits
  • Investigate LED circuit integration for charging indicators
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Electronics engineers, hobbyists working with high voltage circuits, and anyone interested in capacitor charging mechanisms and circuit design.

kjjohn
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I understand what a capacitor charging circuit looks like, and know how it works. My question is, with an HV boost converter charger, for charging high voltage caps, there is often an LED that lights when charging is complete. How does this work - how does the charger know when the capacitor is full? And does it actually disconnect the cap from the circuit or shut off the circuit after the cap is completely charged?
 
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