DRIVE CIRCUIT OF POWER CONVERSION CIRCUIT

PROBLEM TO BE SOLVED: To solve such a problem that when an excessive current is applied to a power switching element Sw, a time lag occurs before taking countermeasures against the current. SOLUTION: A serial connection body of a Zener diode 78 and a switching element 76 as a clamp circuit for clamp...

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Bibliographische Detailangaben
1. Verfasser:	KAMIYA YASUHIRO
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS CONTROL OR REGULATION THEREOF CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY GENERATION
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To solve such a problem that when an excessive current is applied to a power switching element Sw, a time lag occurs before taking countermeasures against the current. SOLUTION: A serial connection body of a Zener diode 78 and a switching element 76 as a clamp circuit for clamping a gate voltage of the power switching element Sw is connected between a gate and an emitter of the power switching element Sw. The switching element 76 is operated to be turned on over a prescribed period from a switching start time point from an off-state to an on-state of the power switching element Sw. In this way, a gate voltage of the power switching element Sw is limited by the Zener diode 78 over the predetermined period from the switching start time point of the power switching element Sw to the on-state. The prescribed period is set so as to finish before the completion time of a mirror period. COPYRIGHT: (C)2011,JPO&INPIT