The Commutation Cell in Converters
The commutation cell can be found in any power electronic converter. Some examples are given in figure 4. As can be seen, a "current source" (actually a loop that contains an inductance) is always connected between the middle point and one of the external connections of the commutation cell, while a voltage source (or a capacitor, or a connection in series of voltage source and capacitor) is always connected to the two external connections.
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“I turn and turn in my cell like a fly that doesn’t know where to die.”
—Antonio Gramsci (1891–1937)