High Voltage DC Power Indicator

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SUMMARY

The discussion focuses on using a current sense transformer to induce voltage from a 20kVDC pulse for energizing an LED in synchronization with the pulses. The correct method involves passing one lead of the power cable through a ferrite toroidal core, creating a single turn coil, while winding a secondary coil around the toroid to generate sufficient voltage. This technique allows for minimal power extraction from the lead, ensuring safe operation while lighting the LED. Reference materials include "Instrument Transformers" and Current Transformers for further understanding.

PREREQUISITES
  • Understanding of high voltage DC systems
  • Knowledge of current sense transformers
  • Familiarity with ferrite toroidal cores
  • Basic electronics principles, including voltage and current relationships
NEXT STEPS
  • Research the design and application of current sense transformers
  • Learn about ferrite toroidal core specifications and selection
  • Explore LED driver circuits for high voltage applications
  • Investigate safety protocols for working with high voltage DC systems
USEFUL FOR

Electrical engineers, hobbyists working with high voltage systems, and anyone interested in LED applications in high voltage environments will benefit from this discussion.

rdvernon
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I have a 20kVDC pulse flowing to an igniter. 2500 pulses per minute. I want to know if it is possible to use the high voltage pulses of DC to induce sufficient voltage in a coil wrapped around the power cable (through which the current is flowing) to energize an LED (in synch with the pulses). Any advice on this would be sincerely appreciated.
 
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You don't wrap the coil around the power cable. To use the current in the cable, you need to form a "current sense transformer" where one lead of the cable goes through a ferrite toroidal core, and then you wind some number of turns on the toroid as a secondary coil. The one pass through the toroid by the power lead is a single turn coil, and your secondary has some number of turns that you tune to give you enough voltage to light your LED. This taps a little bit of power off of the power lead, but not much as long as you limit the current through your LED.

See "Instrument Transformers" or Current Transformers here: http://en.wikipedia.org/wiki/Transformer
 

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