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AN2859 Arkusz danych(PDF) 4 Page - STMicroelectronics

Numer części AN2859
Szczegółowy opis  Multiplexed diagnostics of AC switches using two STCC08
PDF  29 Pages
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2859 Arkusz danych(HTML) 4 Page - STMicroelectronics

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Multiplexed diagnostics
AN2859
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DocID15255 Rev 2
1.2
Failure mode detection of two AC switches
Figure 3 to Figure 12 give the VSTATE signal level according to the state of each AC switch.
V0, V1, V2 and V3 are levels reached by the parameter VSTATE and depends on R1, R2, R3,
and R4 resitor values.Table 1 shows that we only need four different levels to define the
state of each AC switch.
Figure 3. Case 1: VSTATE = V3 (except at each zero crossing of the AC line)
Figure 4. Case 2: VSTATE = V0
VCC
VCC
R1
R2
R3
R4
V
STATE
V3
V2
V1
V0
VSTATE
STCC082
V
AVF2
V
AVF1
AVF
AVF
V
AC
I
Load_1
V
AC
I
Load_2
AC
AC
STCC081
VCC/COM
RAC
VCC/COM
ACS2
ACS1
Load1
Line
Load2
Line
I
Load_2
I
Load_1
RShunt
RAC
RShunt
IN2
IN1
G
G
VAC
VAC
ACS1 and ACS2 are not in conducting state
V2
V1
V0
I
Load_1
I
Load_2
VCC
VCC
R1
R2
R3
R4
V
STATE
V
AVF2
V
AVF1
AVF
AVF
AC
AC
VCC/COM
RAC
VCC/COM
ACS2
ACS1
Load1
Line
Load2
Line
I
Load_2
I
Load_1
RShunt
RAC
RShunt
V
AC
V
AC
VSTATE
STCC08
2
STCC08
1
V3
IN2
IN1
G
G
V
AC
V
AC
ACS1 and ACS2 are in conducting state



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