Power Factor Controller combines advantages of analog and digital technology

August 05, 2019 //By Christoph Hammerschmidt
Power Factor Controller combines advantages of analog and digital technology
The STNRGPF12 Power Factor Controller from STMicroelectronics combines the flexibility of digital power technology with the responsiveness of analog algorithms. The two-channel PFC uses the Interleaved Boost approach and is easy to configure and optimize with the company's eDesignSuite software.

The STNRGPF12, suitable for applications up to 600W and above, increases efficiency and reliability in a wide range of applications from industrial motor controls to charging stations, uninterruptible power supplies, 4G and 5G base stations, welding equipment, telecommunications exchanges, home appliances and data center power supplies.

The PFC controller operates in non-continuous mode with fixed switching frequency and average current mode control. The inner and outer control loops of the STNRGPF12 combine the best features of the digital and analog worlds. The inner control loop uses a hardware analog PI (proportional integral) compensator, while the outer voltage control loop is implemented with a digital PI controller that scores with fast dynamic response. This allows the STNRGPF12 to provide cascaded voltage and current regulation to control the output voltage based on the average total current in the coil.

Features of the IC include digital inrush current limiting, based on SCRs (Silicon Controlled Rectifiers) in the high-level switching structures to simplify soft start management and improve system robustness. The STNRGPF12 also supports disturbance feedforward, current compensation, phase shedding and fan control. A UART interface provides access to non-volatile memory so that PFC parameters can be tuned by the user to specific application requirements and parameters can be monitored in the field.

ST's comprehensive development system enables users to exploit the potential of the STNRGPF12. The system includes the 2-channel interleaved PFC reference design STEVAL-IPFC12V1 with 2 kW power as well as configuration software to help start your own designs.

Further information can be found at www.st.com/stnrgpf12-pr  

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