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PFC controller reduces harmonic distortion

Posted: 22 Nov 2011     Print Version  Bookmark and Share

Keywords:power factor correction  controller  power metering 

Analog Devices Inc. (ADI) unveils dual-phase ADP1048, claimed as first interleaved digital power factor correction (PFC) controller that offers a power metering accuracy of ±3 per cent at full load current with further improvements to ±1 per cent with customer calibration.

The dual-phase ADP1048 uses conventional, continuous-conduction-mode PFC techniques to reduce harmonic distortion.

The ADP1048 can be configured as an interleaved design to reduce inductor size and replace the AC/DC rectifier to improve efficiency in bridgeless boost mode. These techniques convert all signals to the digital domain and allow parameters to be adjusted and reported over a PMBus-compliant interface, including accurate measurement of input voltage, current and power. The ADP1048 is versatile and easy-to-use, enabling AC/DC designers and system architects to tweak their design in real-time and optimise efficiency at system level, stated ADI.


ADP1048 provides power metering accuracy of ±3 per cent at full load.

The interleaved PFC controller is easily programmed using an intuitive GUI that claims to enable customers to design and optimise their systems without the complex code programming required by alternative DSP-based devices, ADI continued. Designed specifically for high reliability AC/DC PFC systems and motor control applications, the ADP1048 is said to be suited to communications infrastructure, industrial and instrumentation systems such as motor control, and high-power medical imaging applications.

The digital controller also offers enhanced transient response through non-linear control algorithms, programmable inrush control to reduce start-up over-stress, real-time programming to maximise efficiency and extensive fault detection and reporting for improved reliability, according to ADI. The ADP1048 can be frequency synchronised to eliminate 'beat' frequency noise, or alternatively, the switching frequency spread spectrum feature can be enabled to further improve EMI.

The ADP1048 digital PFC controllers operate from -40°C to 85°C. The devices are packaged in 24-lead QSOP and are priced at Rs.161.43 ($3.60) each per 1,000 pieces.

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