AN-3008 RC Snubber Networks for Thyristor Power Control and ...
AN-3008 RC Snubber Networks for Thyristor Power Control and ...
AN-3008 RC Snubber Networks for Thyristor Power Control and ...
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<strong>AN</strong>-<strong>3008</strong><br />
APPLICATION NOTE<br />
HG = W AT LOW<br />
LD10-1000-1000<br />
CAPACITOR DECADE 1–10 µF, 0.01–1 µF, 100pF–0.01µF<br />
NON-INDUCTIVE<br />
RESISTOR DECADE<br />
0-10k, 1Ω STEP<br />
0.01<br />
R S<br />
2N3904<br />
2N3906<br />
51k<br />
51k<br />
2W<br />
2N3904<br />
0.1 0.1<br />
2N3904 2N3906<br />
C S<br />
+5<br />
dV<br />
dt<br />
SYNC<br />
120<br />
1/2W<br />
2W<br />
51 2W<br />
51<br />
2.2k<br />
1/2<br />
2N3906<br />
120<br />
1/2W<br />
2W<br />
-5<br />
0.01<br />
1<br />
+CLAMP<br />
-CLAMP<br />
910k<br />
TRIAD C30X<br />
50H, 3500Ω<br />
Q 3 Q 1<br />
MR760<br />
2W<br />
2 WATT<br />
Q 3 Q 1<br />
910k<br />
2W<br />
+ 1.5kV<br />
62µF<br />
1kV<br />
6.2 MEG 2W<br />
+ – 70mA<br />
–<br />
150k<br />
6.2 MEG 2W<br />
2N3906<br />
2N3904<br />
Q 3 Q 1<br />
-5<br />
+5<br />
PEARSON<br />
301 X<br />
360 1/2W 360 1/2W<br />
1k<br />
1k<br />
2 CASE<br />
CONTROLLED<br />
2N3904<br />
HEATSINK<br />
– +<br />
G 56<br />
2N3906<br />
TRIAC<br />
0.22 0.22<br />
UNDER<br />
270k 1N5343<br />
TEST<br />
7.5V<br />
270k<br />
0-1 kV 20 mA<br />
2.2M 2.2M, 2W<br />
2.2M 2.2M, 2W<br />
L L<br />
R L<br />
CL (NON-POLAR)<br />
2.2M<br />
2.2M<br />
MR760 MR760<br />
Appendix D<br />
dV<br />
Derivations<br />
dt<br />
Definitions<br />
1.0 R T = R L + R S = Total Resistance<br />
I PK I P<br />
C L = T<br />
6f I PK x 10 -6<br />
W 0 V Ci 2π V L L = V Ci = T 2<br />
I dl<br />
=<br />
W 0 =<br />
=<br />
Ci W 0 I PK 4π 2 C L<br />
L<br />
dt L<br />
c<br />
A/µs<br />
Figure 41.<br />
dV<br />
(<br />
dt<br />
) c<br />
Test Circuit <strong>for</strong> <strong>Power</strong> TRIACs<br />
1.1<br />
M<br />
=<br />
R S<br />
------ = <strong>Snubber</strong> Divider Ratio<br />
R T<br />
1.2<br />
ω0<br />
=<br />
1<br />
-------------- = Undamped Natural Frequency<br />
LC S<br />
ω<br />
=<br />
Damped Natural Frequency<br />
1.3<br />
α<br />
=<br />
R<br />
------ T<br />
= Wave Decrement Factor<br />
2L<br />
1.4<br />
χ 2 = --------------------<br />
1⁄ 2LI2<br />
=<br />
2<br />
1⁄<br />
2CV<br />
Initial Energy In Inductor<br />
---------------------------------------------------------------------<br />
Final Energy In Capaitor<br />
1.5<br />
χ<br />
=<br />
I<br />
--<br />
E<br />
L<br />
--- = Initial Current Factor<br />
C<br />
1.6<br />
ρ<br />
=<br />
R<br />
------ T<br />
2<br />
C<br />
--- =<br />
L<br />
α<br />
------ = Damping Factor<br />
ω0<br />
1.7<br />
V OL<br />
= E– R S I = Initial voltage drop at t = 0 across the load<br />
20 REV. 4.01 6/24/02
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