19 April 2017
Power Electronics / Power Management
The STNRGPF01 SMPS (switched-mode power supply) controller from STMicroelectronics delivers the flexibility and high efficiency of digital power without the technical challenges and time to develop custom DSP (digital signal processor) code.
In high-power applications above 1 or 2 kW, interleaved CCM PFC (continuous-current mode, power-factor correction) topologies are mandatory to handle such power levels with reasonable magnetic volume and current split. Moreover, the quest for higher efficiency, connectivity and configuration options encourages the use of expensive and complex DSP solutions.
ST’s new SMPS controller for interleaved boost-PFC topologies is configured quickly and easily using the eDesignSuite online design environment, and has I2C and UART interfaces for monitoring and control. It supports three interleaved phases, which ensures low ripple currents, simplifies EMI filter design using small-size inductors, and permits a wide power range from 500 W to over 20 kW. Moreover, the IC’s flexible, configurable phase-shedding strategy optimises the number of active phases automatically to maintain high efficiency across all load conditions.
The STNRGPF01 operates in CCM at fixed frequency with average-current-mode control. A hardware inner-current loop ensures accurate cycle-by-cycle regulation, while a digital proportional-integral (PI) controller manages the outer voltage loop to ensure fast dynamic response. The frequency can be programmed from a few kHz to over 300 kHz, to control either an IGBT or MOSFET output stage. Other configurable features include inrush current limiting and PFC soft power-on.
Application areas for the STNRGPF01 include industrial welders, motor drives, pumps, uninterruptible power supplies (UPS), industrial or consumer air conditioners, and domestic appliances such as refrigerators, washers, dryers and cookers.
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