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S3F84B8_ALL-IN-ONE IH COOKER_AN_REV 0.00 2 HARDWARE IMPLEMENTATION
2-9
2.4 POWER CONTROL
Power is the product of voltage and current (P = V x I). Figure 2-5 and Figure 2-6 show the measurement circuit of
system voltage and current, separately.
2.4.1 VOLTAGE MEASUREMENT
Figure 2-5
shows the circuit diagram for voltage measurement and surge protection.
R20
29K
+
C16
10uF/50V
SYS_V
R27
6K8
C18
221
Surge_P
220 VAC
AC_L
D9
1N4007
AC_N
D10
1N4007
surge protection
R17
470K/0.5W
R19
820K/0.5W
R18
820K/0.5W
C15
102/1KV
Figure 2-5 Voltage Measurement and Surge Protection Circuit
Resistor divider decreases the voltage level to the proper ADC range.