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SA2002ESA датащи(PDF) 5 Page - Sames |
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SA2002ESA датащи(HTML) 5 Page - Sames |
5 / 10 page 5/10 sames sames SA2002E http://www.sames.co.za FUNCTIONAL DESCRIPTION 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 200µW) 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 (1MW). 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 IV 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 VOLTA GE 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 |
Аналогичный номер детали - SA2002ESA |
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Аналогичное описание - SA2002ESA |
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