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AN437 Datasheet(PDF) 8 Page - STMicroelectronics

Part # AN437
Description  RC snubber circuit design for TRIACs
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN437 Datasheet(HTML) 8 Page - STMicroelectronics

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How to design snubber circuit for turn-off improvement
AN437
8/18
Final voltage value:
Equation 5
Snubber circuit divider ratio:
Equation 6
By solving the second order linear differential equation according to the damping factor and
initial conditions (refer to Appendix A: RLC series circuit step response explanation), two
diagrams can be defined. These diagrams give the slope of the voltage rise (dV/dtOFF) and
the peak voltage (VP) according to the damping factor (ξ) and the load resistance (M) (refer
to Figure 8).
The voltage rise slope (dV/dtOFF) is defined as the maximum instantaneous voltage rise
slope.
Figure 8.
Trade-off between normalized peak voltage (Z = VP/E), normalized voltage
rise slope (K = dV/dtOFF/(E x ω0)) according to damping factor (ξ) and the
divider ratio (M)
As shown on these two diagrams, the load resistance (R) helps to reduce dV/dtOFF and VP.
The load impact is significant if the damping factor is higher than 0.2.
)
sin(
V
2
E
RMS
ϕ
·
·
=
with
2
2
)
L
(
R
L
)
sin(
ω
ω
ϕ
·
+
·
=
VRMS : mains rms voltage
R
R
R
M
S
S
+
=
Z = V /E
P
K = dV/dt
/(E x
)
OFF
ω
0
1
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
2
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
M = 1
M = 0.75
M = 0.5
M = 0.25
M = 0
M decreases
Damping factor:
ξ
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
2.2
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
M=1
M = 0.75
M = 0.5
M = 0.25
M=0
Damping factor:
ξ
M decreases


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