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With the proliferation of laser and inert-gas flash lamps, high voltage trigger/pulse
transformers are becoming more and more popular. In these applications the
trigger transformer is utilized to pulse a short duration high voltage “trigger”
to initiate the start-up of the laser/flash lamp. The extreme high voltage
ionizes the gas in the tube which becomes conductive. Once the gas within
the flash lamp between the anode and cathode becomes conductive, the initial resistance
drops. What happens after the trigger depends on how the designer configures
the circuit driving the flash lamp. Usually, the circuit runs in one of three
modes, external, pseudo-series, or series mode. In non-series modes the trigger
transformer is no longer required to power the flash lamp. All the current
flowing to the lamp bypasses the transformer and is supplied directly to the lamp.
This allows these types of trigger transformers to be smaller in size and more cost
effective. However, the series trigger transformer has better timing accuracy.
Often times the larger size of the series trigger transformer is acceptable because
timing accuracy for certain applications is critical. More portable circuitry
uses a capacitor that is charged and then allowed to discharge through the primary
of the trigger transformer. This creates a high voltage pulse (or trigger)
on the secondary winding. The secondary pulse is then fed to whatever load
is attached. Most of our trigger designs run at a higher frequency and require
the use of low loss cores such as ferrites.
Custom Coils also uses flying leads and high dielectric epoxies to encapsulate and
isolate the high voltage associated with these type transformers. In all cases,
Custom Coils can design and manufacturer pulse and trigger transformers to meet
the requirements of your circuit.
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