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SA4106ASAR 参数 Datasheet PDF下载

SA4106ASAR图片预览
型号: SA4106ASAR
PDF下载: 下载PDF文件 查看货源
内容描述: [Single Channel Single Phase Energy]
分类和应用:
文件页数/大小: 18 页 / 568 K
品牌: SAMES [ SAMES ]
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SA4106A  
FUNCTIONAL DESCRIPTION  
Theory of Operation  
Analog Inputs  
The input circuitry of the current and voltage sensor inputs is  
illustrated in Figure 5. These inputs are protected against  
electrostatic discharge through clamping diodes. The  
feedback loops from the outputs of the amplifiers AI and AV  
generate virtual short circuits between IIP and IIN as well as  
IVP and AGND. The current sense inputs (IIP and IIN) are  
identical and balanced. The AD converters convert the  
signals on the voltage and current sense inputs to a digital  
format for further processing. All internal offsets are  
eliminated through the use of various cancellation  
techniques.  
The SA4106A includes all the required functions for single  
channel single phase power and energy measurement. Two  
AD converters sample the voltage and current input signals.  
The two digital signals, accurately representing the voltage  
and current inputs, are multiplied using digital multiplication.  
The output of the multiplier represents the instantaneous  
power, which is subsequently low pass filtered and integrated  
over time to remove the instantaneous components forming  
the averaged instantaneous energy. This energy is  
accumulated over time to form the outputs of the device.  
For given voltage and current signals the instantaneous  
power is calculated by:  
VDD  
IIP  
( )  
푝 푡 = 푣(푡) × ꢀ(푡)  
VSS  
( )  
(
)
(
)
푝 푡 = cos 휔푡 + 휃 × 퐼cos 휔푡 + 휓  
CURRENT  
CURRENT  
SENSOR  
CHANNEL  
ADC  
AI  
INPUT  
VDD  
ꢂ  
ꢂ  
then  
2
Let 휙 = 휃 − 휓, and 푅푀푆  
=
and 푅푀푆  
=
2
IIN  
( ) )  
(
)
(
푝 푡 = cos 휔푡 + 휃 × 퐼cos 휔푡 + 휃 − 휙  
VSS  
VDD  
( )  
(
( ( ))  
)
푝 푡 = 푅푀푆 푅푀푆  
cos 휙 + cos ꢄ 휔푡 + 휃 − 휙  
where  
IVP  
p(t) is the instantaneous power,  
VOLTAGE  
SENSOR  
INPUT  
VSS  
v(t) is the instantaneous voltage signal,  
i(t) is the instantaneous current signal,  
VM is the amplitude of the voltage signal,  
IM is the amplitude of the current signal,  
VOLTAGE  
CHANNEL  
ADC  
AV  
AGND  
is the phase angle of the voltage signal and  
is the phase angle of the current signal.  
Figure 5: Analog input configuration  
The instantaneous power is low pass filtered to remove the  
double mains frequency component cos(2(t+)-) and is  
then integrated over time to provide the average power  
information  
Digital Outputs  
The calculations required for power and energy are  
performed and converted to pulses on the LED, MON and  
MOP outputs. The complimentary output pins MON and MOP  
are provided for driving a stepper motor counter directly. The  
output frequency on the LED output is, in both STANDARD  
and FAST mode, proportional to the average active power  
consumption measured. The FAST mode is intended for fast  
meter calibration and verification purposes or for interfacing  
the SA4106A to a microcontroller.  
1
푃 = ∫ 푝(푡)푑푡  
푃 = 푅푀푆 푅푀푆  
cos 휙  
where  
P is the average power and  
cosis the power factor.  
Anti-Creep Threshold  
An integrated anti-creep function prevents any output pulses  
on the LED output and the MON/MOP motor drive outputs  
when the level of measured energy is below the anti-creep  
threshold. This threshold is selectable between 0.01% and  
Linearity  
The SA4106A is a CMOS integrated circuit, which performs  
power/energy calculations across a dynamic range of 500:1  
to an accuracy that exceeds the IEC62053 specification.  
SPEC-1587 (REV. 5)  
29-09-2017  
7/18