BASE DRIVE CIRCUIT OF BIPOLAR DARLINGTON TRANSISTOR

PURPOSE:To decrease the turn-off time of a bipolar Darlington transistor (TR) while avoiding from being extended as the case with the saturating state by operating the TR without bringing the collector and base of a driver TR for the bipolar Darlington TR. CONSTITUTION:When a current given from a ba...

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Bibliographische Detailangaben
Hauptverfasser:	HIRAMOTO TAKAHIRO, MAJIYUUMUDAARU GOORABU
Format:	Patent
Sprache:	eng
Schlagworte:	BASIC ELECTRONIC CIRCUITRY ELECTRICITY PULSE TECHNIQUE
Online-Zugang:	Volltext bestellen
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Beschreibung
Zusammenfassung:	PURPOSE:To decrease the turn-off time of a bipolar Darlington transistor (TR) while avoiding from being extended as the case with the saturating state by operating the TR without bringing the collector and base of a driver TR for the bipolar Darlington TR. CONSTITUTION:When a current given from a base drive current source 1 to a base of the Darlington TR2 is increased, the increment of the base current is clamped via a diode 14 and a Zener diode 15, a current over the saturated current of the base-emitter of the TR is not given to the base of the Darlington TR2 thereby avoiding the Darlington TR2 from being over-driven. Thus, the storage time of the Darlington TR2 is nearly halved in comparison with the storage time when the collector-base is saturated completely and the turn-off time of the bipolar Darlington TR2 is reduced remarkably.