PM9607AP 查看數據表（PDF） - South African Micro Electronic Systems
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PM9607AP Datasheet PDF : 16 Pages
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PM9607AP
sames
Combining the two equations gives:
( RA + RB ) / 230V = RB / 14V
Values for resistors R4 = 10W , R5 = 24W k and R6 = W 1M is
chosen.
Substituting the values result in:
RB = 23.437kW
RA = RB x ( 230V / 14V – 1 )
RA = 361.607kW .
Standard resistor values of R1, R2, R3 and R4 are chosen to
be 120kW , 120W k , 12W 0k anW d 10 .
The capacitor C4 is used to compensate for phase shift
between the voltage sense inputs and the current sense inputs
of the device, in cases where CTs with phase errors are used.
The phase shift caused by the CT may be corrected by
inserting a capacitor in the voltage divider circuit. To
compensate for a phase shift of 0.18 degrees the capacitor
value is calculated as follows:
C = 1 / (2 x p x Mains frequency x R5 x tan (Phase shift angle))
C = 1 / ( 2 x p x 50 x 1MW tan (0.18 degrees ))
C = 1.013µF
Reference Voltage VREF
The VREF pin of the SA9607 is connected to a resistor that
determines the on chip bias current. The PM9607AP module is
set up for the SA9607M, so the bias resistor is made up of
resistor R17 and trimpot P1 in series. The multi turn trimpot P1
may be varied for precise calibration.
Calibration of the bias current is not necessary when using the
SA9607P as device calibration is loaded from the external
EEPROM.
Ground GND
The GND pin of the SA9607 is connected to the neutral phase,
which is halfway between VDD and VSS. Note that supply
bypass capacitors C1 and C2 are positioned as close as
possible to the supply pins of the device, and connected to a
solid ground plane.
Protection
A MOV together with R4 protects the transformer and the
voltage divider circuit against voltage transients.
Common mode and asymmetrical transients are attenuated
by the current setting resistors R8, R9 R10 and R11.
POWER SUPPLY
The PM9607AP module uses a transformer based power
supply to ensure flexibility for different counter drive
configurations. The maximum current that can be drawn by
the circuit is as follows:
The average power consumption of the module is usually less.
The current indicated in table 2 is worst-case peak pulse
current. The normal operating current of the module is closer
to 15mA. A 78LC05-voltage regulator is used to regulate the
voltage from the transformer. Two resistors R18 and R19
generate the analog ground voltage for the SA9607. The
SA9607 operates between 5 Volt and 0 Volt with its GND pin
connected to mid-rail.
Source
Max current
Unit
SA9607M/P IC
5
mA
DIR LED
5
mA
SEL1 LED
5
mA
ELT LED
5
mA
Pulse LED
5
mA
Counter
11
mA
GND ref
3
mA
EEPROM
2
mA
Total
41
mA
Table 4: Maximum peak current drawn by components on
the module
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