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SA2005 Arkusz danych(PDF) 4 Page - Sames |
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SA2005 Arkusz danych(HTML) 4 Page - Sames |
4 / 10 page 4/10 sames sames SA2005F Figure 3: Analog Input Internal Configuration http://www.sames.co.za FUNCTIONAL DESCRIPTION The SAMES SA2005F is a CMOS mixed signal integrated circuit, which performs three phase power/energy calculations over a range of 1000:1, to an overall accuracy of better than Class 1. The SA2005F is functionally similar to the SA9105F. No external loop capacitors are required and an precision oscillator is integrated on chip. The integrated circuit includes all the required functions for 3- phase power and energy measurement such as 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 SA2005F generates pulses with a frequency proportional to the power measured. The pulse rate follows the instantaneous power measured. The pulse frequency is proportional to the total sum of the three phases. POWER CALCULATION In the application circuit (figure 5), the mains voltages from V1, V2 and V3, are converted to currents and applied to the voltage sense inputs IVP1, IVP2 and IVP3. The current levels on the voltage sense inputs are derived from the mains voltages (3 x 230VAC) being divided down to 14V through voltage dividers. The resulting input currents into the A/D converters are 14µA through the resistors R8, R9 and RMS R10. For the current sense inputs the voltage drop across the current transformers terminating resistors are converted to currents of 16µA at rated conditions, by means of resistors RMS R1, R2 (Phase 1); R3, R4 (Phase 2) and R5, R6 (Phase 3). The signals providing the current information are applied to the current sensor inputs IIN1, IIP1, IIN2, IIP2 and IIN3, IIP3. The output frequency of the SA2005F energy metering integrated circuit at rated conditions is 64Hz on FOUT (PGM0=0, PGM1=1). One pulse (measured in Watt second) correspond to an energy measured of 3 x I x V / 64Hz. RATED RATED For a more detailed description see the Input Signals section. INPUT SIGNALS Analog Input Configuration The current and voltage sensor inputs are illustrated in figure 3. These 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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