4. Four-quadrant reversible chopper

Each of the above elementary choppers behaves like a variable voltage source. We've already detailed the switching and studied the filters, so we'll confine ourselves to an external study of the four-quadrant version.

Let's take the previous one-arm structure (figure 13 ) and combine two of them in parallel. This gives us the combination: two quadrants + two quadrants = four quadrants, shown in figure 17 .

In this structure, each of the two half-arms supplies a bidirectional current and a unidirectional voltage. The load seeing the difference between the single...