Line charging waveforms - wykład

Line charging waveforms The solution defined by equation 2.26 has the graph shown in Figure 2.10. The following
observations may be made about the diagram.
• There is no activity at the load until the time T for a one-way propagation of signals
on the line has elapsed.
• The initial step at that time is the product of two factors, one being the initially
launched forward wave on the line and the other being the sum of unity and the
reflection factor at the load, this sum being known as the transmission factor at the
load junction.
• Although in this diagram it is shown that the initial step is to a voltage less than
the eventual load voltage, the factors controlling the size of this initial step are such
that in some circumstances the step is to a value greater than the eventual load
voltage.
• Subsequent steps in the load voltage occur at times 2T, 4T, etc. after the initial
step, that is at total times 3T, 5T, etc.
• Each of those subsequent steps is a common factor times the amplitude of the
preceding step. That common factor is the product of the reflection factors looking
back toward the load and looking towards the source.
• Those subsequent steps form a geometrical progression of which the common ratio
happens to be positive in this illustration, but can be either positive or negative in
the general case.
... zobacz całą notatkę