Question

For a power transistor, the average power loss during the delay time can be given by the equation

(a) Ic * Vc

(b) 1/T * ∫^Td (Ic Vce) dt

(c) Ic * dVc/dt * T

(d) 1/T * ∫^(Td *Tr) (Ic Vc) dt

I had been asked this question by my school teacher while I was bunking the class.

My question is taken from Power Transistors-2 topic in portion Power Electronics Devices of Power Electronics

Answer 1

Right choice is (b) 1/T * ∫^Td (Ic Vce) dt

To explain: During the delay time only, the collector current flows & base to emitter voltage is zero. Hence the average power can be found, simply by integrating it over the total delay time & dividing by the base time period.