This is shown in fig. 8-3d (green areas!!) The average value of v L b is zero (equal surface area criterion, see p. The exact form of i o is provided by expression (7-1). Between 180° and ωt 2 = δ the output voltage of this circuit is negative ! At this point the magnetic energy starts to discharge and the current starts to decrease.Īt the instant t 2 = δ/ω the current has reached the holding value I H and the thyristor switches off. From this instant the polarity of v L b reverses. This instant corresponds to the end of the magnetic charging of the coil, in other words the current i o has reached its maximum. In addition, at every moment in time v o = v R b + v L b.Īt the instant that v R b = v o, v L b becomes zero, see fig. 8-3d to the right. With a current i o through a coil, there is a corresponding magnetic energy L b ⋅ i o 2 2 The current can only gradually increase because of the inductive nature of the load. Jean Pollefliet, in Power Electronics, 2018 2.2 Current flowĪfter the firing angle α the thyristor starts to conduct.
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