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بسم هللا الرحمن الرحيم The Islamic University of Gaza Faculty of Engineering Electrical Engineering Department POWER ELECTRONICS EELE 5450 — Summer 2012 Instructor: Eng. Jalal Al Roumy Lecture 10 Chapter Four Single-Phase Full-Wave Inductive Load circuit The output Assume Both thyristors thatdcthe voltage are inductance triggered ED williswith be sufficiently function the same of large, delay firing soangle, angle: that each hence Scr conducts they share thefor load a period current ofequally. 180 degree.( The load conduction currentcurrent is shownis continuous). to be constant dc (due to large value of inductance) Chapter Four Single-Phase Full-Wave Inductive Load circuit The output dc voltage ED will be function of firing angle: The The output output dc dc voltage voltage E EDD is: is: o Maximum Maximum when when α= α=0 o Zero Zero when when α= α=90 o Negative Negative maximum maximum when when α= α=180 o o α90<α <180<180 ???? ???? Chapter Four Single-Phase Full-Wave Inductive Load circuit Chapter Four A constant The A single-Phase load voltage load current cannot Full-Wave be is maintained negative Phase-Controlled by free-wheeling Converter current through with the diode: Free-Wheeling Diode End of Lecture