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參數(shù)資料
| 型號(hào)： | SA2002HSA |
| 廠商： | SAMES |
| 元件分類： | 電能質(zhì)量分析儀 |
| 英文描述： | Single Phase Bi-directional Power / Energy Metering IC with Instantaneous Pulse Output |
| 中文描述： | 單相雙向功率/電能計(jì)量IC瞬時(shí)脈沖輸出 |
| 文件頁(yè)數(shù)： | 5/10頁(yè) |
| 文件大?。?/td> | 122K |
| 代理商： | SA2002HSA |
The SA2002E is a CMOS mixed signal Analog/Digital
integrated circuit, which performs power/energy calculations
across a power range of 1000:1, to an overall accuracy of
better than Class 1.
The integrated circuit includes all the required functions for 1-
phase power and energy measurement such as two
oversampling A/D converters for the voltage and current sense
inputs, power calculation and energy integration. Internal
offsets are eliminated through the use of cancellation
procedures. The SA2002E generates pulses, the frequency of
which is proportional to the measured power consumption.
One frequency output (FOUT) is available. The pulse rate
follows the instantaneous power consumption measured.
POWER CALCULATION
In the application circuit (figure 6), the voltage drop across the
shunt will be between 0 and 16mV
(0 to 80A through a shunt
RMS
resistor of 200μ
W
) The voltage is converted to a current of
between 0 and 16uA
, by means of resistors R1 and R2. The
RMS
current sense inputs saturates at an input current of ±25μA
peak.
For the voltage sensor input, the mains voltage (230VAC) is
divided down through a divider (R3, R4 and P1) to 14V
. The
RMS
current into the A/D converter input is set at 14μA
at nominal
RMS
mains voltage, via resistor R5 (1M
W
). P1 may be varied for
calibration purposes.
In this configuration, with a mains voltage of 230V and a
current of 80A, the output frequency measured on the FOUT
pin is 1360Hz. In this case one pulse on FOUT correspond to
an energy consumption of 18.4kW/1360Hz = 13.53Ws.
ANALOG INPUT CONFIGURATION
The input circuitry of the current and voltage sensor inputs is
illustrated in figure 7. These inputs are protected against
electrostatic discharge through clamping diodes. The
feedback loops from the outputs of the amplifiers A and A
I
V
generate virtual shorts on the signal inputs. Exact duplications
of the input currents are generated for the analog signal
processing circuitry.
Figure 6: Application circuit
Figure 7: Internal analog input configuration
GND
VDD
DR-01148
VOLTAGE
SENSOR
INPUT
IVP
SS
V
IIN
IIP
CURRENT
SENSOR
INPUTS
SS
V
SS
V
VDD
DD
V
A
V
A
I
DR-01584
R3
VDD
VREF
IIP
IIN
GND
IVP
VSS
FOUT
U1
SA2002E
R4
R5
R1
R2
R6
L
N
L
N
RSH
P1
GND
GND
VSS
VDD
GND
Supply
VDD
VSS
Pulse output
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