Cálculo de redes snubber paa conexiones con Triac con respecto al valor de capacitares y resistencias.
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Snubber Circuits
A.
Overview of Snubber Circuits
B.
Diode Snubbers
C.
Turn-off Snubbers
D.
Overvoltage Snubbers
E.
Turn-on Snubbers
F.
Thyristor Snubbers
William P. Robbins Professor Dept. of Electrical Engineering University of Minnesota 200 Union St. SE. Minneapolis, MN 555455
• Selection of Cs • Minimize energy dissipation (W T) in BJT at turn-on • Minimize WR + WT • Keep switching locus within RBSOA • Reasonable value is C s = Cs1 • Selection of R s • Limit icap(0+) =
Use same design as for diode snubber but adapt the formulas to the thyristor circuit notation I r r 2 Snubber capacitor C s = Cbase = Lσ V d
•
•
di Lσ
From snubber equivalent circuit 2 L σ dt
I rr =
di Lσ dt
2VLL
tr r =
2Lσ
2VLL
tr r = 2
0.05 V LL
=
2 VLL
t rr = 25 ωI a1t r r
3 I a1ω
•
Vd =
•
0.05 V LL 2 5 ωI a1t r r 2 8.7 ωI a1t r r = Cs = Cbase = VLL 3 I a1ω 2VLL
•
Vd
Snubber resistance R s = 1.3 Rbase = 1.3 I
•
•
2 VLL
R s = 1.3
2VLL 25ωI a1t r r
=
rr
0.07 V LL ωI a1t r r
Energy dissipated per cycle in snubber resistance = W R