L, i Vs Rs VG RG R, Y D, (a) Protection circuits FIGURE 4.47

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Extracted text: L, i Vs Rs VG RG R, Y D, (a) Protection circuits FIGURE 4.47


Extracted text: = 20 kHz. The 4.16 A bipolar transistor is operated as a chopper switch at a frequency of f, circuit arrangement is shown in Figure 4.47a. The de input voltage of the chopper is V = 400 V and the load current is IL tf = 4 µs. Determine the values of (a) L;; (b) C;; (c) R, for critically damped condition; (d) R, if the discharge time is limited to one-third of switching period; (e) R, if peak dis- charge current is limited to 5% of load current; and (f) power loss due to RC snubber P, neglecting the effect of inductor L, on the voltage of snubber capacitor C,. Assume that VCE(sat) = 125 A. The switching times are t, = 1.25 µs and = 0.