Power Electronics(scanned book) by Dr.P.S.Bimbhra
By Dr.P.S.Bimbhra
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Extra resources for Power Electronics(scanned book)
Example text
Describe t he types of BJTs with their circuit symbols. (c) De me a an d ~ for BJT and develop a relati on between the two . Why is a less than 1 and ~ m OTe t han 1 ? (d ) Why is it preferrable to use hard drive for BJ T ? 7 . (c'z ) vVhat is th e difference bet we en ~ an orced ~f for BJTs ? (6) Whflt are th e conditio ns un der which a transistor operates as a switch? Discuss hard -drive and over drive fact or for BJT. (c ) Show L at colle ctor current at sat urati on remains s ubstan tially con3:ant even if base curren t is i n ~r ea sed.
When gate circuit voltage is zero, and V DD is present, n- - p- junctions are reverse biased and no current flo'ws from drain to source. When gate terminal is made positive with respect to sou rce, an electric field is established and electrons form n-channel in the p- 'regions as shown. So a current from drain to source is established as indicated by arrows. With gate voltage increas ed , current I D also increases as expected. Length of n-channel can be controlled and therefore on-resistance can be made low if short length is used for the channel .
E . t ofr ;=' s + tr The vari ous waveforms during transistor swi tching a e shown in Fig. 9. In t h is figu 8; tn = conduction period of tt-ans 'stor, to = off period, T = 11f is the periodic time andfis t he switc ing fr equency. 3. Sale Oper ating Are a. The safe operating ar ea (SOA or SOAR) of a power tran sis tor specifies the sa e operating limits of coll ect or current l r. versus collector-emitte voltage V Cg For _eli able op er ation of the transistor, the collector current and v oltage m ust always lie within this a.