The half-wave, phase-controlled rectifier system of Problem 10.9 and Figure is to be replaced by the full-wave, phase-controlled system of Figure. SCR T1 will be triggered ON at time t_d (0 t_d ?/w), and SCR T4 will be triggered on exactly one half cycle later.

a. Find an expression for the average (dc) value V_dc of the voltage v`_s (t) across the series resistor/inductor combination as a function of the delay time t_d.

b. Using the fact that, in the steady state, there will be zero average voltage across the inductor, find an expression for the dc inductor current I_dc, again as a function of the delay time t_d.

c. Plot Idc as a function of td for (0 t_d ?/w).

d. Plot the source current i_s (t) for one cycle of the source voltage for t_d = 3 msec.

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