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參數資料
| 型號： | SA2005PSA |
| 廠商： | SAMES |
| 元件分類： | 計數器 |
| 英文描述： | Programmable Three Phase Power / Energy Metering IC for Stepper Motor / Impulse Counter Applications |
| 中文描述： | 可編程三相功率/電能計量集成電路步進電機/脈沖計數器的應用 |
| 文件頁數： | 4/10頁 |
| 文件大?。?/td> | 107K |
| 代理商： | SA2005PSA |
4/10
sames
SA2005F
Figure 3: Analog Input Internal Configuration
http://www.sames.co.za
The SAMES SA2005F is a CMOS mixed signal integrated over a range of 1000:1, to an overall accuracy of better than The SA2005F is functionally similar to the SA9105F. No oscillator is integrated on chip.phase power and energy measurement such as oversampling calculation and energy integration. Internal offsets are The SA2005F generates pulses with a frequency proportional instantaneous power measured. The pulse frequency is POWER CALCULATIONV2 and V3, are converted to currents and applied to the voltage The current levels on the voltage sense inputs are derived from through voltage dividers. The resulting input currents into the through the resistors R8, R9 and R10.current transformers terminating resistors are converted to at rated conditions, by means of resistors R1, R2 (Phase 1); R3, R4 (Phase 2) and R5, R6 (Phase 3). The current sensor inputs IIN1, IIP1, IIN2, IIP2 and IIN3, IIP3.integrated circuit at rated conditions is 64Hz on FOUT One pulse (measured in Watt second) correspond to an energy x VRATEDFor a more detailed description see the Input Signals section.Analog Input ConfigurationThese inputs are protected against electrostatic discharge through clamping diodes, in conjunction with the amplifiers
input configuration. The feedback loops from the outputs of the
amplifiers A and A generate virtual shorts on the signal inputs.
I
V
Exact duplications of the input currents are generated for the
analog processing circuitry.
Voltage Reference Connection (VREF)
A bias resistor of 24k provides an optimum bias conditions on
chip. Calibration of the SA2005F should be done on the
voltage inputs of the device as described in Typical
Applications.
Current Sense Inputs (IIN1, IIP1, IIN2, IIP2, IIN3, IIP3)
At rated current the resistor values should be selected for input
currents of 16μA
. Referring to figure 5, the resistors R1 and
RMS
R2 on current channel 1, resistors R3 and R4 on current
channel 2 and resistors R5 and R6 on current channel 3, define
the current level into the current sense inputs of the SA2005F.
The current sense inputs saturates at an input current of ±25μA
peak. Resistors R25, R26 and R27 are the current transformer
termination resistors. The voltage drop across the termination
resistors should be at least 20mV at rated conditions. Values
for the current sense inputs are calculated as follows:
R = R = (I / 16μA
) x R / 2
1
2
L
RMS
25
R = R = (I / 16μA
) x R / 2
3
4
L
RMS
26
R = R = (I / 16μA
) x R / 2
5
6
L
RMS
27
Where:
I = Line current/CT-ratio
L
VOLTAGE
SENSOR
INPUT
IVP
DR-01288
SS
V
CURRENT
SENSOR
INPUTS
IIP
IIN
SS
V
VDD
SS
V
VDD
DD
V
GND
A
V
A
I
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