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Energy metering IC protects against tampering

Posted: 28 Oct 2010     Print Version  Bookmark and Share

Keywords:energy metering IC  single-phase meter  smart meters 

Analog Devices Inc. debuts an energy metering IC, the ADE7953 that is designed for single-phase meter configurations targeted at the electrical needs of homes ranging from small apartments to large residences in which many appliances and electronic devices are used.

The device measures active, reactive and apparent energy along with rms voltage and current. It also provides neutral current measurements that help designers develop tamper-proof smart meters with stronger protection against electricity theft, improved customer billing accuracy and reduced operating costs for utility companies.

According to the company, the ADE7953 provides the industry's highest accuracy for single-phase metering applications worldwide by achieving less than 0.1 per cent error for both active and reactive energy calculations over a dynamic range of 3000:1.

For neutral current, the device offers less than 0.1 per cent error active and reactive energy over a 1000:1 dynamic range.

The device also measures apparent energy along with rms voltage and current. Additionally, it provides waveform sampling, instantaneous power readings and power quality indications that include voltage sag, peak voltage and peak current. The ADE7953 incorporates three sigma-delta ADCs (analogue-to-digital converters) with a high accuracy metrology engine. Each input channel supports independent and flexible gain stages, making the ADE7953 energy metering IC suitable for use with a variety of current sensors, such as low value shunt resistors and current transformers. Two on-chip integrators also facilitate the use of di/dt sensors for current inputs.

Additional features such as rms current and voltage measurements are offered with less than 0.2 per cent error over a 500:1 dynamic range.

Access to on-chip meter registers via a variety of communication interfaces including SPI (serial peripheral interface), I2C or UART (universal asynchronous receiver/transmitter) are available.

Also available are two configurable pulse output pins providing outputs that are proportional to active, reactive, or apparent energy, as well as rms current and voltage; and a full range of power quality information, such as over-current, over-voltage, peak and SAG detection that are accessible via the external IRQ pin 3.3V supply operation.

Recommended complementary components for the ADE7953 energy metering IC include the ADP121 linear regulator, AD7814 temperature sensor, ADuM141x four-channel digital isolators, ADuM120x two-channel digital isolators, ADM2484E RS485 transceiver, ADM6320 supervisory circuit, ADP5022 buck regulator, and ADF7023 RF transceiver.

The ADE7953, available in a 28-lead LFCSP package, is sampling now. It will be in production in January 2011 and priced at Rs.100.40 ($2.15) each/1,000.

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