Question

Tutorial 1) 1. The data sheet of a switching device specily the following times corresponding to the linearized characteristic and connected as shown in the figure below. Vd = 400V ; f. = 25kHz; 1. = 104; R = 750 tri = 100us; ti 250us; t = 70us; t. 70us; t „ = 150us Calculate the switching power losses (energy), and average switching power loss (energy), assuming linear voltage and current switching characteristics, Plot the switch voltage and current and the switch power losses (energy) and resistor voltage as a function of time r loss with the sum of the switching ON and OFF trans R Vt Vd

Answer 1

Solution :
ton G Tc TON Toss al Conduction los Softching loss & During tym oN {(8) = It ton outra doveo f V los pavi = VI ton Yen (+-# tom Eston victs = VI tore? - for don VE son 3ton je

During tom oft is f("tem) YCH - vt foss pa v toff È off VE toff p.dt> VE 0 switching loss = Eon of foss E VI (for & toff) given dita V400 Volt I TO Amp fon - tritt fv 120 MS foff a tsit fry = 250 & 15o = 40ors = 400 x 10 (1704 400] xjot f 380 m)