LIGHTING SOLUTIONS
D A T A S H E E T
Trigger Transformers
The process that effects the
initial ionization within a flash-
lamp is known as "triggering.”
Triggering creates a voltage
gradient in the gas of sufficient
magnitude to cause ionization of
the lamps. Most flashlamp
applications use a trigger coil to
produce high-voltage pulses of
short duration, usually a few
microseconds or less.
Two different types of circuits
and transformers are used to
introduce the voltage necessary
to achieve ionization – series
injection triggering and external
triggering with the associated
coils.
External triggering uses a high-
voltage trigger pulse to create a
thin ionized streamer between
the anode and cathode within
the lamp. The coupling of this
voltage to the lamp can be
achieved using a thin nickel
wire wrapped around, or a metal
stripe on the surface of the lamp
envelope. These types of trigger
coils are generally lighter,
smaller, and less expensive than
those used for series injection
triggering. Series triggering offers
higher timing accuracy and is
often used in combination with
liquid cooled lamps in lasers.
Trigger coils are typically larger,
since they not only generate the
HV ignition, but also must cope
with lamp currents in the order
of several thousand Amps.
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