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ADI unveils 24bit smart grid, power monitoring sol'ns

Posted: 03 Nov 2015     Print Version  Bookmark and Share

Keywords:Analog Devices  smart grid  SoC  converter  ADC 

Analog Devices Inc. has announced a 24bit data acquisition SoC series geared to enhance the performance of protection, monitoring and power quality measurement equipment used to manage transmission and distribution of electrical energy within smart grid systems. According to the company, the AD777x series includes an integrated sample rate converter, which simplifies the design challenge associated with making the power quality equipment compliant with the IEC61000-4-30 Class A standard.

The AD7770 enables higher performance and smaller form factor protection relays, while the AD7771 enables power quality measurement equipment to provide early detection of power grid electrical faults. The third SoC in the series, the AD7779, ensures fast power-up in circuit breaker equipment.

AD777x series

All three devices in the AD777x series claim to offer the industry's best combination of dynamic range and data throughput and feature eight simultaneous sampling channels that measure the output from current and voltage sensors in three-phase power applications. Each SoC channel achieves 112dB of dynamic range at 8kSPS, enabling the consolidation of protection and measurement functions on a single ADC channel.

The AD777x series incorporates a programmable gain amplifier (PGA) to scale various sensor outputs, allowing system designers to use a common platform for applications with different accuracy requirements and input sensor types, including current transformers, potential transformers and resistive strings. Additionally, the AD777x series lowers total system cost by eliminating the need for external components such as signal conditioning amplifiers and phase-locked loops (PLLs). The entire AD777x series incorporates sample rate converters that enable the fine adjustment of the sampling rate and maintain coherency to a 0.01Hz change in line frequency over a 50Hz (-15 per cent) to 60Hz (15 per cent) range. This is a requirement for the IEC61000-4-30 Class A power quality standard.

AD7770 block diagram

AD7770 block diagram

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