Download Islamic University of Gaza

Islamic University of Gaza
Faculty of Engineering
Power Electronics
Problem set #1
Instructor: Eng. Moayed N. Almobaied
Deadline: Wednesday 31/10/2009
Problems (1,3,6,9,11,14) to be solved in discussion.
______________________________________________________
1-Text book (Rashid) (2.1)
2-Text book (Rashid) (2.2)
3-Text book (Rashid) (2.3)
4-Text book (Rashid) (2.4)
5-Text book (Rashid) (2.5)
6-Text book (Rashid) (2.6)
The above questions are attached in the problem-set.
7- The following figure shows the circuit diagram of a magnetic stimulator made by an international
biomedical electronics company. The pulsed magnetic field generated by the transducer coil (represented
by the inductor) can be used in a variety of medical treatments including nerve stimulation. The capacitor is
precharged to a Voltage Vx between 0 and 1000 V, and then at t = 0 the switch S is closed to trigger the
magnetic pulse.
Calculate the following assuming that the switch S and the diode D are ideal:
1. The time response of the coil current after the switch S is closed, as a function of the precharge voltage
Vx. (Some types of stimulation require a field with a fast rise time and a slow fall time.)
2. The peak coil current for Vx = 950 V.
3. The time t1 at which diode D turns on.
4. The energy dissipated in the resistor for Vx = 950 V.
5- Using any time-domain simulation tool you want (e.g. PSPICE, PSIM, etc.), simulate the circuit for 1 ms
after the switch is closed. Assume that Vc = 950 V when switch S is closed.
8-Text book (Rashid) (4.1)
9-Text book (Rashid) (4.2)
10-Text book (Rashid) (4.3)
11-Text book (Rashid) (4.5)
12-Text book (Rashid) (4.6)
13-Text book (Rashid) (4.7)
14-Text book (Rashid) (4.8)
15-Text book (Rashid) (4.9)
16-Text book (Rashid) (4.10)
17- Find the following parameters for 1n4007, 1N1183A, MDN1200D33.
Power Dissipation, Forward Voltage, Maximum Full Load Reverse Current, Reverse Current @ Rated VR
Average Rectified Forward Current.
18 – for the following circuit:
a) Find the diode voltages if R1 = R2 =R3= 100 k
b) Find the voltage sharing resistancesR1,R2 and R3 for equal diode voltages
Assume that Is1=25mA, Is2=32mA,Is3=27mA
19- Find the following parameters for Bt151, 2N4373.
Power Dissipation, average on-state current, dIT/dt, dVD/dt, VT, IH, IL
20- For the following SCR parameters:
6500V, 1.500A for 50us pulse
From the website find:
a) SCR part number which deals with these parameters
b) Its real photo
c) Manufacturing company
d) di/dt
e) dv/dt
f) Its price.
21- For the following Figure
Fig4.28