1) A MOSFET transistor is being used as a converter switch in a 100v system. It
ID: 1810623 • Letter: 1
Question
1) A MOSFET transistor is being used as a converter switch in a 100v system. It is switching at 50 KHz and has a linear transition time of 3us. The full load current is 40 amps. - How much average power is being wasted due to switching? - If this is the only loss mechanism, what is the system efficiency? - What transition times would be needed to achieve an efficiency of 90%? _____ 40%? ____ - If the frequency is doubled, describe the change in efficiency? _______________ 1) A MOSFET transistor is being used as a converter switch in a 100v system. It is switching at 50 KHz and has a linear transition time of 3us. The full load current is 40 amps. - How much average power is being wasted due to switching? - If this is the only loss mechanism, what is the system efficiency? - What transition times would be needed to achieve an efficiency of 90%? _____ 40%? ____ - If the frequency is doubled, describe the change in efficiency? _______________Explanation / Answer
power =V*I/2 =100*40/2 = 20000
efficiency = (1/3)/(1/3+50 ) = 86
for 90 % ,
0.9 = x/(x+50)
x = 0.9*50/0.1 = 450
transition = 1/450 =2.2*10^-6 s
for 40 % , trasition = 30 *10 ^-6 s
when frequency is double , effieicncy = (1/3)/( 1/3+100) =76.9 %
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