Power Electronics

Digital Power Factor Correction Controller with Power Metering

ANALOG DEVICES, INC. (ADI) announced the first digital PFC (power factor correction) controller with highly accurate AC power meter capability and inrush control functionality. ADI's new ADP1047 digital PFC controller is effective for AC/DC power-factor correction and precision power metering applications that require high reliability and redundant power supplies, such as communications infrastructure and motor control.

The ADP1047 digital PFC controller uses conventional, continuous-conduction mode PFC techniques; all signals are converted to the digital domain, allowing all parameters to be adjusted and reported over a PMBus™-compliant interface — including accurate RMS measurement of input voltage, current and power. This allows designers to optimize system harmonic performance, maximize efficiency across the load range and reduce time to market. The ADP1047 is programmed using an intuitive, easy-to-use GUI (graphical-user interface).

The ADP1047 digital PFC controller provides typical power metering accuracy of ±3 percent at full load current with further improvements to ±1 percent with customer calibration. The new digital PFC controller also offers enhanced transient response through non-linear control algorithms, programmable inrush control to reduce start-up over-stress, real-time programming to maximize efficiency and extensive fault detection and reporting for improved reliability. The ADP1047 digital PFC controller can be frequency synchronized to eliminate “beat” frequency noise, or alternatively the switching frequency spread spectrum feature can be enabled to further improve EMI.

Analog Devices portfolio of digital power management products are specifically designed to meet the needs of the AC/DC and isolated DC/DC power supply OEMs. These devices are extremely flexible and use an I2C or a PMBus interface that allow “real-time” reporting of key parametric data from the power system. The digital power products are highly programmable and feature an easy-to-use GUI tool. Power design engineers with no prior programming experience can use the GUI to monitor and quickly adjust power functions such as frequency, timing, voltage settings, and protection limits.

Analog Devices Inc., Norwood, MA,

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