Discharge circuits and loads Page: 10 of 62
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DISCHARGE CIRCUITS AND LOADS
W. J. Sarjeant
This will be an overview in which some of the general properties of
loads are examined:
" their interface with the energy storage and switching devices;
" general problems encountered with different types of loads;
" how load behavior and fault modes can impact on t'le design of a
power conditioning system (PCS).
A. General Properties of the Discharge Circuit and Load
Consider, in Figs. 1 and 2, a transmission line with some Impedance
Zo and a one-way transit time 8, connected in series with an ideal switch,
and a load resistor RL. Now, V0 is the voltage to which the line Is
charged. When the ideal switch is closed, a current1 equal to
flows for a time T * 26. For this discussion, let us accept this as an
experimental fact. The pulse width r, base to base, is then 26 for the
case in which the load ir.,edance equals the impedanice of the transmission
For maximum energy transfer it can be shown that there is a relation-
ship between the energy stored in the line and the energy.delivered to the
load. There is a broad maximum in the energy transfer efficiency (Fig. 1).
Even with a significant impedance mismatch there can still be a quite high
transfer of efficiency in the system. From 0.5 to 1.5 in the ratio of
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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/m1/10/: accessed April 19, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.