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SA2007HPA Datasheet(PDF) 4 Page - Sames |
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SA2007HPA Datasheet(HTML) 4 Page - Sames |
4 / 10 page 4/10 sames sames SA2007H Figure 3: Analog input internal configuration http://www.sames.co.za FUNCTIONAL DESCRIPTION The SA2007H 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 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. Referring to the block diagram (figure 1) the SA2007H has two current sense channels and a voltage sense channel. The voltage measured is multiplied with the current measured on the two channels. The multiplied signals from each current channel is fed to separate power to pulse rate blocks. The power to pulse rate blocks generate pulses at a frequency proportional to the instantaneous active power measured. Pulses on output P1 represent energy measured on current channel 1. The pulses on output P2 represent energy measured on current channel 2. Counting the pulses generated represents the energy measured. A typical application would be to simultaneous measure energy/power consumption in both Live and Neutral lines. A meter tamper condition could be detected when an imbalance exists between the live and neutral energy/power measured. Two modes of operation is available on the SA2007H, in one mode the device is functionally the same as two SA2002H devices sharing a common voltage channel. Alternatively the pulse output is latched and an interrupt is generated on any change of the pulse outputs. POWER CALCULATION In Figure 8, the voltage drops across the current transformers terminating resistors are converted to currents for each current sense input, by means of resistors R and R (channel 10 11 1) as well as R and R (channel 2). The current sense input 12 13. saturates at an input current of ±25µA peak. The mains voltage (230VAC) is divided down through a divider to 14V . The current into the A/D converter input is set at RMS 14µA at nominal mains voltage, via resistor R (1MW). RMS 7 In this configuration, with a mains voltage of 230V and a current of 80A, the output frequency measured on P1 or P2 pin is 1360Hz. In this case the energy associated with a single pulse is 18.4kW/1360Hz = 13.5Ws per pulse. ANALOG INPUT CONFIGURATION The input circuitry of the current and voltage sensor inputs are illustrated in figure 3. 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. ELECTROSTATIC DISCHARGE (ESD) PROTECTION The SA2007H integrated circuit's input's/outputs are protected against ESD. POWER CONSUMPTION The power consumption rating of the SA2007H integrated circuit is less than 30mW. 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 PRELIMINARY |
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