Single Chip Targeted At Grid-Connected Systems

Austriamicrosystems, a designer and manufacturer of analogue ICs, has launched an integrated single-chip solution for voltage and current monitoring in power inverters. The AS8002 offers improved performance and reduces the system cost of power inverters, while allowing simplified design with a reduced number of components, according to the company. The single-chip design is especially targeted at grid-connected systems such as solar photovoltaic inverters.

The chip is claimed to offer advantages over alternative approaches in terms of monitoring the signals injected into the grid. The AS8002 enables the use of low-cost resistors for current and voltage sensing. The sensed voltage and current are directly available in a high-resolution digital format. The chip's flexible front end provides adjustable gain to accommodate various resistor values and on-chip calibration allows compensation for external component inaccuracies as well as variations over temperature.

Added features such as fast over-current detection provide additional safety. These features make the AS8002 suitable for other power monitoring applications, such as wind turbines and uninterruptible power supplies. Michael Leitner, director of the marketing business unit industry and medical at Austriamicrosystems, said: 'For economic, safety and regulatory reasons, electrical energy injected to a power grid must be accurately monitored.

'As the need for grid monitoring continues to grow, the AS8002 will replace a number of solutions that suffer from higher cost, lower accuracy or poorer performance,' he added. The AS8002 is available in a 4 x 4mm QFN-16 package, operates from 3.0V to 3.6V and is specified for an operating temperature range of -40C to +125C. The integrated measurement IC is available now at a 1,000-piece price of USD5.31 (GBP3.68).

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