power electronics

# power electronics - =600 A. Determine (a) The emission...

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ME 305, Fall-2009 Asif Sabanovic Due Oct, 2009 HW#1 1) Draw the V-I (voltage versus current) characteristics of “ideal diodes” and “practical diodes”. Show the various regions in the V-I characteristics of practical diodes. 2) What is the approximate value of V td (Threshold Voltage) and V br (Breakdown Voltage) for a practical diode? 3) Compute the value of I d for a diode whose V d =0.8 V, n=1, V t =25.7 mV, I s =3.112x10 -8 A. 4) The reverse recovery time of a diode is t rr =5 μ s and the rate of fall of the diode current is di/dt = 80 A/ μ s. If the softness factor is SF=0.5, determine (a) The storage charge Q rr and (b) The peak reverse current. 5) The measured values of a diode at a temperature of 25 degree C are V d =1.0 V at I d =50 A and V d =1.5 V at I d

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Unformatted text preview: =600 A. Determine (a) The emission coefficient. (b) The leakage Current I s . 6) In the above circuit the Source Voltage is V s =220 V, inductance L=5mH, capacitance C=10 μ F and resistance R=22 Ω . The initial voltage of the capacitor is V C0 =50 V. If the switch is closed at time t=0, determine, (a) An expression for the current and (b) The conduction time of the diode. (c) Draw (or plot) a sketch of i(t). 7) In the above circuit the switch S 1 is closed at t=0. Determine the expression for (a) The current flowing through the switch i(t) and, (b) The rate of rise of current. (c) What is the value of initial di/dt 8) In the above circuit, the switch S 1 is closed at t=0. Determine the value of di/dt....
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## This note was uploaded on 01/06/2010 for the course ELECTRONIC me 305 taught by Professor Asıfşabanovic during the Spring '09 term at Sabancı University.

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power electronics - =600 A. Determine (a) The emission...

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