《电力电子技术》课程教学课件（PPT讲稿）Topic 15 Line-Frequency Diode Rectifiers

2 Calculatingvoltagedrop△VddiIdi,= oL,I(Ot)= LsAu = / Vrd(ot)dt0006Aμ3AVoL,Id(5-85)a2元元Ia 个→△Va个L,个→ △V 个>VoltaaedropAVincreasewithLsandlincreasing.★3oL,ld(5-86)Va = Vao- △Va =1.35VLI元12

12 2 Calculating voltage drop ΔVd. Vd = s d （5 −85） 3 L I 2  = 6A (5−86)  − 3Ls Id Vd = Vd 0− Vd =1.35VLL dt di   Id 0 0 0 A =  vLd (t) =  Ls s d(t) =Ls  dis =Ls Id Id → Vd  Ls → Vd  ➢Voltage drop ΔVd increase with Ls and Id increasing. ☆

3 Calculatingcommutation angleμ (ory)/2 V (1-cos μ) =oLI sin td(ot)(5-81)2LLsd2020L,Id(5-82)cos u=1J2VLLV,→μIa个→μ个L, 个→μu 个>Commutation angle μ increase with Ls and Idincreasing and decrease with voltage V,increasing.13

13 3 Calculating commutation angleμ (orγ) 2 2 (5−82) (5−81) 2VLL 0 cos  = 1− 2Ls Id  2 VLL sintd(t) =  V （1− cos）=L I 2 LL s d Id →   Ls →  Vs →   ➢Commutation angle µ increase with Ls and Id increasing and decrease with voltage Vs increasing. ☆