Discharge circuits and loads Page: 18 of 62
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DISCHARGE CIRCUITS AND LGADS
amplitude and current flows through the system. The current flow is lim-
ited in its risetime by the lumped inductance L, which couples the switch
and the load. The voltage drop decreases exponentially to the constant
switch drop level for the duration of the pu+ e. The best values experi-
mentally achieved'for TF are 1 ns for thyratr:is at kiloamp peak current.
That is a factor of 10 better than the initial value some 20 years ago.l
For thyratrons, the model that gives very good results in. comparison
to the data, with the discharge times of 20 to 100 ns, replaces the thyra-
tron with a voltage source (Fig. 5). When the switch is closed, it has a
series inductance (from the thyratron and ins connections), a voltage
source in series with it, plus the switch drop (which is an invariant 100
to 200 V for almost all gas switches). The t that gives the best agreement
with the data is, if TF is the total falltime from top to bottom, " 3 TF'
That gives agreement, within 5 to 10, with the data for all types of
tubes. The examples we shall show later using this model predict somewhat
slower rates of rise than are observed with present thyratron switch
III. PULSE TRANSFORMERS
A. Pulse Transformer Models
Pulse transformers (Fig. 6), referring everything to the secondary,
have a magnetizing inductance LE', a shunt capacitance Cc, primary to
ground converted to secondary, the secondary-to-ground capacitance CD,
the leakage inductance LL, the core loss RE', the load resistance RL,
and the voltage, NVo. The switch, actually on the primary, is closed
with everything referred to the secondary. The diagram then shows an LRC
circuit with the risetime LL-CD limited.
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Sarjeant, W.J. Discharge circuits and loads, report, October 15, 1980; New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc1061299/m1/18/: accessed April 25, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.