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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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ADS131M08IPBSR Datenblatt(PDF) 97 Page - Texas Instruments |
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ADS131M08IPBSR Datenblatt(HTML) 97 Page - Texas Instruments |
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97 / 118 page  9.2.1 Design Requirements Table 9-2. Key System Specifications FEATURES DESCRIPTION Number of phases 3 phases: three currents and three voltages measured (as well as neutral current) E-meter accuracy class Class 0.1 Current sensor Current transformer Current range 0.05 A to 100 A Voltage range 100 V to 240 V System nominal frequency 50 Hz or 60 Hz Measured parameters • Active, reactive, apparent power, and energy • Root mean square (RMS) current and voltage • Power factor • Line frequency • Neutral current 9.2.2 Detailed Design Procedure A current sensor connects to the current channels and a simple voltage divider is used for the corresponding voltage measurement. The CT has an associated burden resistor that must be connected at all times to protect the measuring device. The selection of the CT and the burden resistor is made based on the manufacturer and current range required for energy measurements. The voltage divider resistors for the voltage channel are selected to ensure the mains voltage is divided down to adhere to the normal input voltage ranges of the ADS131M08. In this design, the ADS131M08 interacts with a microcontroller (MCU) in the following manner: • The CLKIN clock used by the ADS131M08 device is provided by the MCU • When new ADC samples are ready, the ADS131M08 device asserts its DRDY pin, which alerts the MCU that new samples are available • After being alerted of new samples, the MCU uses one of its SPI interfaces to retrieve the voltage and current samples from the ADS131M08 9.2.2.1 Voltage Measurement Front-End The nominal voltage from the mains is from 100 V – 240 V so this voltage must be scaled down to be sensed by an ADC. Figure 9-6 shows the analog front-end used for this voltage scaling. Live Neutral R FILT C FILT R FILT R LO R HI R HI R HI R V AINxP AINxN Figure 9-6. Voltage Measurement Front-End The analog front-end for voltage consists of a spike protection varistor (RV), a voltage divider network (RHI and RLO), and an RC low-pass filter (RFILT and CFILT). Equation 11 shows how to calculate the range of differential voltages fed to the voltage ADC channel for a given mains voltage and the selected voltage divider resistor values. LO ADC RMS HI LO R V V 2 3R R r u u (11) www.ti.com ADS131M08 SBAS950B – OCTOBER 2019 – REVISED FEBRUARY 2021 Copyright © 2021 Texas Instruments Incorporated Submit Document Feedback 97 Product Folder Links: ADS131M08 |
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