The electrical characteristics (1)Inductor as a"short circuit to DC"; (2)We can not permit an inductor current to change suddenly. i(t)3H +D() i(4) i(4) r(s)-01 t(s) t(s) 22 AUC ▲D ( 30 t(s) t(s) pulses impulses 脉冲 冲激The electrical characteristics: dt di  = L i(A) t(s) 0 1 2 1 i(A) t(s) 0 1 2 1 − 1 3 i(A) t(s) 0 1 2 1 − 0.1 2.1 (V ) t(s) 0 1 2 pulses 30 + (t) − i(t) 3H (1) A inductor as a ''short circuit to DC"; (V ) t(s) 0 1 2 pulses 3 脉冲 (V ) t(s) 0 1 2 impulses 冲激 (2) We can not permit an inductor current to change suddenly