Energy measurement processor manages sensor data in multi-phase power monitors

April 10, 2015 // By Graham Prophet
Maxim Integrated has posted details of its MAX78615+PPM isolated energy measurement processor, that combines data from multiple current and voltage sensors to form a complete isolated energy measurement system with shortened development time.

MAX78615+PPM is part of an isolated energy measurement processor (EMP) chipset for polyphase power monitoring systems. It is designed for real-time monitoring for a variety of typical three-phase configurations in industrial applications.

The device provides flexible sensor configuration for up to three MAX78700s or MAX71071s that provide up to six isolated analog inputs for interfacing to voltage and current sensors.

MAX78700 is an isolated ADC that needs no separate power supply, begin fed via the isolation transformer that takes data to the host. It provides current and voltage measurements to the host while the host provides control, command, and power to the MAX78700.

MAX71071/MAX71071H are dual-channel isolated metrology ADCs that similarly provide current and voltage measurements to a host while the host provides control, command, and power to the MAX71071/MAX71071H.

A pulse transformer provides the isolated data and power path between the device and host, eliminating the need for additional isolation components in the measurement subsystem. Scaled voltages from the sensors are fed to the isolated front-end via a high-resolution delta-sigma converter. Supported current sensors include resistive shunts and current transformers (CTs).

An embedded 24-bit measurement processor and firmware perform all necessary computations and data formatting for accurate reporting to the host. With integrated flash memory for storing nonvolatile calibration coefficients and device configuration settings, the MAX78615+PPM can be a completely autonomous solution.

The MAX78615+PPM is designed to interface to the host processor through the UART, SPI, or I²C interfaces, and is available in a 24-pin TQFN package. Use the system, Maxim suggests, in building automation systems, grid-friendly appliances and smart plugs, inverters and renewable energy systems, and in Level 1 and 2 EV charging systems

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