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SA4106ASAR Datasheet(PDF) 9 Page - Sames

Part # SA4106ASAR
Description  Single Channel Single Phase Energy
Download  18 Pages
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Manufacturer  SAMES [Sames]
Direct Link  http://www.sames.co.za
Logo SAMES - Sames

SA4106ASAR Datasheet(HTML) 9 Page - Sames

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SPEC-1587 (REV. 5)
9/18
29-09-2017
SA4106A
INPUT SIGNALS
Voltage Reference (VREF)
A bias resistor of 47k
 sets optimum bias and reference
conditions on chip. Calibration of the SA4106A should be
done on the voltage input and not on the VREF input.
Current Sense Inputs (IIP and IIN)
Figure 7 shows the typical connections for the current sensor
input when using a shunt or a current transformer as a current
sensing element. At maximum rated mains current (IMAX) the
resistor values should be selected for an input current of
16µARMS. The current sense inputs saturate at an input
current of ±17.6μARMS (±25μAPEAK), so this allows about 10%
headroom until saturation occurs.
The resistor RSH is the shunt resistor. The voltage drop
across RSH at maximum rated mains current (IMAX) should
not be less than 5mVRMS and not exceed 100mVRMS.
The resistors RA and RB form the current transformers
termination resistor. The reference level is connected in the
centre of the termination resistor to achieve purely differential
input currents. The voltage drop across the termination
resistors at maximum rated mains current (IMAX) should be in
the order of 100mVRMS. The termination resistance should
also be significantly smaller than the DC resistance of the
current transformers secondary winding.
The resistors R1 to R4 define the current flowing into the
device. For best performance the SA4106A requires anti-
alias filters on the current sense inputs. These filters are
realized by means of the capacitors C1 and C2. The typical
cut-off frequency of these filters should be between 10kHz
and 20kHz. The optimum input network is achieved by setting
the input resistors equal, i.e. setting R1 = R2 = R3 = R4 = RC.
This sets the equivalent resistance associated with each
capacitor to RC/2.
Figure 7: Current sense input configuration
Voltage Sense Input (IVP)
Figure 8 shows the voltage sense input configuration. The
voltage sense input saturates at an input current of
±17.6μARMS (±25μAPEAK). The current into the voltage sense
input should therefore be set between
11μARMS and 12μARMS
at nominal mains voltage (VNOM) to allow for a mains voltage
variation of up to +30% and
–50% without saturating the
voltage
sense
input.
Typical
VNOM
values
and
the
corresponding IVP input currents are shown in the following
table.
Table 1: IVP input current for typical values of VNOM
VNOM (V)
IVP Input Current (μARMS)
110 / 220
11
115 / 230
11.5
120 / 240
12
For best performance the SA4106A also requires an anti-
alias filter on the voltage sense input. Referring to Figure 8,
the capacitor C1 is used to implement the anti-alias filter. If a
current transformer is used as a current sensing element then
C1 is also used to compensate for any phase shift caused by
the current transformer. The resistor R4 defines the input
current into the device. The optimum input network is
achieved by setting R4 smaller than 100k
. If R4 is made too
large the capacitor C1 will be very small and the phase shift
of the input network could be affected by stray capacitances.
The potentiometer P1 is used for calibration purposes.
Figure 8: Voltage sense input configuration
R3
R1
IIN
IIP
GND
Current In
I
MAX
16µA
RMS
R4
R2
Current Out
GND
GND
C1
C2
R3
R1
RA
IIN
IIP
GND
CT1
Current In
I
MAX
16µA
RMS
R4
R2
RB
Current Out
C1
C2
RSH
R4
R3
IVP
GND
C1
R2
R1
GND
V
NOM (220V)
(11µA
RMS)
Voltage In
Neutral
GND
R5
P1
(P1 + R5) << R4 << (R1 + R2 + R3)


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