Power Electronics by Branko L. Dokić & Branko Blanuša

Power Electronics by Branko L. Dokić & Branko Blanuša

Author:Branko L. Dokić & Branko Blanuša
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham


(4.224)

where L os is the total stray inductance of the secondary. The time during which the secondary voltage is zero and the choke voltage is –V o, is extended by t d1 (Fig. 4.53b). The same process occurs immediately upon the switch-on of the transistor T r1. Now the commutation time is determined by the time required for the current through D 2 to drop to zero.

Fig. 4.53Equivalent circuit during commutation of current from D 1 to D 2 (a) and real variations of currents i D1 and i D2 (b)

Practically the interval of energy accumulation by the choke L o is shortened by t d1. This means that the output voltage decreases. This is obtained from (4.204) when t 2 is increased and t 2 − t 1 = t 4 − t 3 decreased by t d1, i.e.,



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