$17$

A transistor is used as a switch and the waveforms are shown below. The parameters are given as follows: $V_{CC}=200V,V_{\text{B}\text{E}\text{C}}A,t_d=0\mathrm{.}1s,t_t=0\mathrm{.}45s,t_s=3\mathrm{.}2s,t_s=1\mathrm{.}1s,t_n=49\mathrm{.}45s,t_0=45\mathrm{.}7s,$ and $f_s=10KHz,k=50\%$ and $lcs{o}_{cm}=3mA.$

quertion

The average losses during the rise time $t_r=$ W